ES3
PART A
Metering Installation Requirements
July 2015
SCOPE
This publication provides general information to assist with connection of metering equipment to
Ausgrid’s network.
WARNING
It is the responsibility of the user of this document to ensure that only the current version is being
used.
Ausgrid may amend this document at any time.
DOCUMENT AND AMENDMENT HISTORY
Issue
No.
Date
Approved by
Summary of Changes
1
June 2004
GM – Network
This document supersedes the following
Customer Installation Advices (CIAs):
CIA 1048D, 1211D, 1259, 1260, 1268 & 1277A
2
Jan 2007
M – Practice &
Procedures - Network
This document supersedes the previous version
of ES3 and CIAs 1230, 1240, 1257, 1259,
1260A, 1268, 1277A, 1300B, 1302, 1303, 1304,
1311, 1312.
3
Sept 2009
M – Installation Policy
& Compliance – DO&R
This document supersedes the previous version
of ES3 and CIAs 1321, 1324, 1330
4
Feb 2014
M – Installation Policy
& Compliance – NO
This document supersedes the previous version
of ES3 and CIAs 1344 and 1346
5
June 2014
M – Network and
Customer
Technologies
This document supersedes the previous version
of ES3 and CIA 1383
6
July 2015
Network & Customer
Technology Manager
This document supersedes the previous version
of ES3 and CIA 1386
ISSN 1032-7215
Published and printed by Ausgrid.
Copyright , Ausgrid.
This publication may only be reproduced with the permission of Ausgrid.
All correspondence should be directed to:
Chief Engineer
Ausgrid
GPO Box 4009
SYDNEY NSW 2001
CONTENTS
1
INTRODUCTION ................................................................................................................. 1
1.1
1.2
1.3
2
Definitions ................................................................................................................. 2
Provision of metering equipment.............................................................................. 5
Notification requirements for new metered installations .......................................... 6
METERING REQUIREMENTS FOR SMALL RETAIL CUSTOMERS .................................. 7
2.1
Introduction............................................................................................................... 7
2.2
Application of ToU and Flat Rate Metering Policy ................................................... 7
2.2.1
New Installations .............................................................................................. 8
2.2.2
Existing Installations ......................................................................................... 8
2.3
Metering requirements ........................................................................................... 10
2.3.1
Metering equipment ........................................................................................ 10
2.3.2
Standard metering configurations .................................................................. 10
2.3.3
Non-standard metering configurations ........................................................... 10
2.3.4
Protection of metering .................................................................................... 10
2.3.5
Number of meters per installation .................................................................. 11
2.3.6
Customers with controlled loads .................................................................... 11
2.3.7
Customers that remove controlled load.......................................................... 11
2.3.7.1 E2 meter for controlled load use .............................................................. 12
2.3.7.2 Load control unit (LCU) ............................................................................ 12
2.3.8
Mix of ToU and Flat Rate meters ................................................................... 12
2.3.9
Transferring meters from a builders service to the permanent installation .... 13
2.3.10 Relocating existing meters ............................................................................. 13
2.3.11 Flexible switchboard and panel wiring............................................................ 13
2.3.12 Standard wiring configurations for meters ...................................................... 13
2.3.12.1 E1 Single phase single element electronic meter.................................... 14
2.3.12.2 B1 Single phase element meter............................................................... 14
2.3.12.3 E2 single phase dual element electronic meter with controlled load ....... 15
2.3.12.4 E3 three phase single element electronic meter ..................................... 15
2.3.12.5 B3 three phase single element meter ...................................................... 16
2.3.12.6 E3 two phase single element electronic meter. ....................................... 16
2.3.12.7 Load control device wiring diagram ......................................................... 17
2.3.13 Details required on the notification of service work form (NOSW) ................. 17
2.4
Application of tariffs ................................................................................................ 17
2.4.1
Reading of Flat Rate metering equipment ..................................................... 17
2.4.2
Reading of Time of Use metering equipment ................................................. 17
2.5
Metering equipment spacing requirements ............................................................ 18
2.5.1
Single metered installations ........................................................................... 18
2.5.2
Multiple metering installations ........................................................................ 19
2.5.2.1 Single phase multiple domestic installations ........................................... 19
2.5.2.2 Commercial and multi-phase multiple domestic installations .................. 19
2.5.2.3 Automated metering reading (AMR) requirements .................................. 19
2.5.3
Existing metering installations ........................................................................ 19
2.6
Fixing of metering equipment ................................................................................. 20
2.7
Metering requirements for embedded generation .................................................. 20
2.7.1
Details required on the notification of service work form (NOSW) ................. 20
2.7.2
Embedded generation metering requirements ............................................... 20
2.7.3
Net metered embedded generation requirements ......................................... 21
2.7.4
Registration of bi-directional energy flow in ToU meters................................ 21
2.7.5
Gross metered embedded generation requirements ..................................... 22
2.7.5.1 Gross metering configuration 1................................................................ 23
2.7.5.2 Gross metering configuration 1a.............................................................. 23
2.7.5.3 Gross metering configuration 2................................................................ 24
2.7.5.4 Gross metering configuration 3................................................................ 24
2.7.5.5 Gross metering configuration 4................................................................ 25
2.7.5.6 Gross metering configuration 5................................................................ 25
2.7.6
Adding additional bi-directional metering ....................................................... 26
2.7.6.1 General guide to follow ............................................................................ 26
2.7.6.2 Alternate Gross and Net metering configuration 2 .................................. 28
2.8
Energising metering ............................................................................................... 29
2.9
Metering With Remote Data Acquisition Capability ............................................... 29
2.9.1
3
METERING REQUIREMENTS TYPE 1 - 4 METERING INSTALLATIONS ....................... 31
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
4
Remote communicating meters permitted to be removed ............................. 29
Notification requirements for new installations ....................................................... 32
Notification requirements for existing installations ................................................. 32
Entry to Ausgrid substations .................................................................................. 32
Commercial agreements ........................................................................................ 33
Information on existing Ausgrid metering equipment ............................................. 33
Metering data requirements ................................................................................... 33
Compliance with Ausgrid’s safety plans ................................................................. 33
Load control units (LCU) ........................................................................................ 33
Labelling and contact details .................................................................................. 33
Location of Type 1-4 metering installations ........................................................... 33
Checklist for Type 1 to 4 metering installations ..................................................... 34
LOW VOLTAGE CURRENT TRANSFORMER METERING REQUIREMENTS ................ 36
4.1
Prior to commencement of switchboard installation............................................... 36
4.2
Low voltage CT’s .................................................................................................... 36
4.2.1
Low voltage CT’s supplied by Ausgrid. .......................................................... 36
4.2.2
Low voltage CT’s not supplied by Ausgrid. .................................................... 36
4.3
Low voltage CT primary conductor requirements .................................................. 37
4.4
General requirements of CT installation and secondary conductors ..................... 37
4.4.1
CT metering test block requirements ............................................................. 37
4.4.2
Secondary conductors .................................................................................... 38
4.5
Arranging metering for a low voltage CT installation ............................................. 38
5
HIGH VOLTAGE METERING REQUIREMENTS .............................................................. 39
5.1
Instrument transformer compliance ....................................................................... 39
5.2
Provision for instrument transformer testing .......................................................... 40
5.3
Voltage transformers .............................................................................................. 40
5.3.1
Type 1 installations ......................................................................................... 40
5.3.2
Single phase VTs ........................................................................................... 40
5.3.3
Three phase VT .............................................................................................. 40
5.3.4
VT secondary terminal boxes ......................................................................... 40
5.4
High voltage current transformers .......................................................................... 41
5.4.1
Type 1 Installations......................................................................................... 41
5.4.2
Type 2 Installations......................................................................................... 41
5.5
High voltage combined transformers ..................................................................... 41
5.6
High voltage metering installation documentation ................................................. 41
5.7
Marshalling box ...................................................................................................... 41
5.8
Secondary cables ................................................................................................... 42
5.9
Metering panels and enclosures ............................................................................ 43
5.10 Earthing .................................................................................................................. 44
5.11 Fuse ratings............................................................................................................ 44
5.12 Labelling ................................................................................................................. 45
5.13 Auxiliary supply ...................................................................................................... 46
5.14 Information required prior to electrification ............................................................. 46
6
RETURNING OF METERING EQUIPMENT...................................................................... 47
APPENDIX A – SPECIAL NOSW FORM, METER TYPES 1- 4 ................................................... 48
APPENDIX B – OBSOLETE ZELLWEGER ZE22/3 LOAD CONTROL RELAYS ........................ 49
1
Introduction
This document outlines Ausgrid’s revenue metering installation requirements for all metered
installations within the Ausgrid distribution area. The metering installation must also comply with the
following requirements where applicable:
•
The National Electricity Rules
•
AEMO Metrology Procedure
•
AEMO Service Level Procedures for MPB’s and other associated AEMO procedures
•
Ausgrid’s Electrical Supply (ES) series of documents
•
Ausgrid’s Connection Policy, Connection Charges
•
The customers connection contract with Ausgrid (under NECF)
•
Deemed Standard Connection Contract
•
Service and Installation Rules of NSW
•
Ausgrid’s Network Standard (NS) series of documents
•
AS/NZS3000, The Wiring Rules
General Guide to Metering Provision
Type of Connection
Metering Arrangement
Provider of Metering
Whole Current
Less than 100 Amps
Flat Rate or ToU Whole
Current Metering
Ausgrid
Type 4 Whole Current
Metering
Metering Provider of choice
(Contestable Arrangements)
ToU
Ausgrid
Type 1-4
Metering Provider of choice
(Contestable Arrangements)
(per metering point)
Current Transformer
Connected
Greater than 100 Amps
(per metering point)
and High Voltage
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1.1
Definitions
AEMO
Australian Energy Market Operator.
ASP
Accredited Service Provider.
BASIC Meter
A meter used in a Flat Rate Metering Installation.
Bi Directional
Metering
ToU electronic metering that is capable of measuring both energy
consumption (Import) and energy generated back into the electricity
network (export)
CCEW
Certificate of Compliance – Electrical Work
CEC
Clean Energy Council. Formerly the Business Council of Sustainable
Energy.
Complying
Generator
Under the NSW Solar Bonus Scheme this is a solar photovoltaic generator,
a wind turbine, or a renewable energy generator of a class prescribed by
the regulations, that:
(a) has a generating capacity of no more than 10 kilowatts,
(b) is installed and connected to the distribution network in a manner that
provides for all the electricity generated to be supplied to the distribution
network ,
(c) allows the relevant distribution network service provider to measure at
any instant the amount of electricity supplied,
(d) complies with, and is installed and connected in a manner that complies
with any safety, technical or metering requirements that may be prescribed
by the regulations or market operations rules,
(e) Connected via a CEC approved inverter,
(f) Is connected at a Small Retail Customers installation.
Connection
Application
Connection Application. See Ausgrid’s website for details
http://www.ausgrid.com.au/Common/Our-network/Connecting-to-thenetwork/How-do-I-connect-to-the-network/Connection-application-formsand-guides.ASPx
Connection Point
Means the junction between the customers installation and the electricity
network. Known as point of common coupling as per the Service and
Installation rules of NSW. See the Service and Installation Rules of NSW for
examples.
CT
Current Transformer
Customer
Installation
For the purpose of this document, a Customer Installation is the whole or
portion of a customer’s private electrical installation that requires separate
metering and an individual National Metering Identifier (NMI) for the
purposes of the National Electricity Market (NEM). For example a block of
20 home units or flats will have at least 20 Customer Installations and
possibly one or more common Customer Installations such as house lights,
lifts and essential services.
Data Stream
Data Stream means a stream of energy data or metering data associated
with a metering point, as represented by a NMI. For example, a NMI will
have multiple Data Streams where one or more meters or one or more
channels or registers comprise a single meter. Each Data Stream is
identified by a suffix, which is associated with the NMI to which it belongs.
Export Energy
Electricity that is generated by the customer and delivered back to the
Ausgrid Network (i.e. electricity delivered to the NEM electricity pool).
Flat Rate Metering
A Type 6, accumulation or Basic metering installation.
Gross Metering
A metering system that measures the electricity generated by the
Complying Generator system.
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ILAC
The International Laboratory Accreditation Corporation.
Import Energy
Electricity that is drawn from the local distribution network and consumed or
used within the customer’s installation (i.e. electricity received from the
NEM electricity pool).
Load Control Unit
(LCU)
Load Control Unit means ripple frequency relay or a time switch that
controls specific customer load. Refer to ES7 – Application of Network Use
of System Charges for further information on controlled load tariffs.
Meter
Maintenance
Means the replacement or repair of any metering equipment as deemed
necessary by Ausgrid. Meter Maintenance on electricity meters may only
be conducted by Ausgrid.
MRIM
Manually Read Interval Meter - a meter used in a ToU Metering Installation.
MDP
Meter Data Provider - A service provider accredited by AEMO and
responsible for the collection, validation, storage and distribution of
electricity meter data.
MPA
Metering Provider A – A service provider accredited by the NSW Trade and
Investment and Authorised by Ausgrid (i.e. Level 2, Category 4 ASP), who
is responsible for the installation of NER compliant whole current
connected metering for sites < 160MWh energy consumption per annum
for a NEM Responsible Person (e.g. Ausgrid Local Network Service
Provider).
MPB
Metering Provider B - A service provider accredited by AEMO and
responsible for electricity meter supply, installation, maintenance, testing
and repair of a metering installation.
NER
National Electricity Rules.
NEM
National Electricity Market.
Net Metering
A metering system that measures the excess energy generated and
exported into the distribution network.
Non compliant
For the purposes of this document this means an embedded generation
system that does not meet the requirements of the NSW Solar Bonus
Scheme
NMI
National Metering Identifier.
NSW Trade and
Investment
The Department of Trade and Investment, Regional Infrastructure and
Services (NSW) who manage the accreditation scheme for contestable
works within NSW.
NOSW
Notification of Service Work (Ausgrid). See ES4 for further details.
Responsible
Person
The person who has responsibility for a metering installation for a particular
Connection Point, being either the Local Network Service Provider (e.g.
Ausgrid) or the Market Participant as described in Chapter 7 of the NERs.
Rule Compliant
Rule Compliant is metering that complies with the requirements of the
National Electricity Rules (Chapter 7) and associated procedures.
Small Retail
Customer
A customer with an energy consumption of less than 160MWh’s per
annum.
Special NOSW
Special Notification of Service Work (Ausgrid) for Type 1-4 contestable
metering and is completed by AEMO Accredited MPB’s. See Appendix A.
Solar Bonus
Scheme
The NSW Government scheme which commenced on the 1st January
2010, which introduced a feed in tariff for all Complying Generators
connected to a NSW distribution network.
Structure (Str)
Is the electronic meter’s program configuration identifier which identifies the
measurement parameters of the meter.
Time of Use (ToU)
metering
A Type 5, interval or MRIM metering installation.
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Type 1-4 Metering
Installation
A metering installation containing an electronic meter, or meters, capable of
recording electrical energy consumption in 30 minute market intervals in
accordance with the NER. The installation will also contain an approved
communication device to enable the remote acquisition of the metering
data.
Type 5 Metering
Installation
A metering installation containing an electronic meter, or meters, capable of
recording electrical energy consumption in 30 minute market intervals in
accordance with the NER. Such meters are read manually by meter
readers. Data is down-loaded via probes into a hand-held data collection
device carried by Ausgrid meter readers. Also known as an MRIM, ToU or
interval meters.
Type 6 Metering
Installation
A metering installation containing a meter, or meters, (electronic or
electromechanical) capable of recording cumulative electrical energy
consumption only. Such meters are read manually by Ausgrid meter
readers who record the total cumulative consumption readings displayed
on the Type 6 meter register. All meters can support a Type 6 Installation,
but they are predominantly installed with mechanical meters or simple
electronic meters. Also known as BASIC, Flat Rate or accumulation
meters.
VT
Voltage Transformer
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Provision of metering equipment
The customer is required to fund the cost of connection to the network, refer to Ausgrid’s Connection Policy – Connection Charges. The Customer’s ASP is
also required to pay a capital contribution for the electricity meter used for any new or upgraded Type 5 or Type 6 installation.
Arrangements for the provision of metering services vary depending on the arrangements described in this table:
Network Tariff
Arrangement (11)
Market
Type
Retail
Customer
Category (8)
Customer
Category
Connection
Table 1: Provision of metering equipment
Phases
1.2
Metering Equipment
Supply
Residential
Commercial
Residential
Residential
Commercial
Residential
Commercial
1
Default Flat Rate
Type 6
3
1
3
3
Commercial
3
Residential
1
3
Commercial
WC
1
WC
WC
Embedded
Generation & Opt-In
Time-of-Use
Default Time of Use
(LV)
CT
Default Time of Use
WC
As per ES7
Installation
Ownership
Maintenance
B1/B3 Meter–Ausgrid (1)
LCU – Ausgrid (2)
ASP
Ausgrid
E1/E2/E3 Meter–Ausgrid (1)
LCU – Ausgrid (2)
Small
(9)
Ausgrid
Type 5
E4 Meter–Ausgrid (3)
LCU – Ausgrid (2)
CT – Customer(4)(5)
Small
(9)
Type 4
Ausgrid
Customer
Customer
Meter – MPB
LCU – Ausgrid (if requested)
(2)
MPB (7)
Meter – MPB
MPB (7)
3
3
or
(LV)
CT
Commercial
Large
(10)
As per ES7
3
CT – Customer (4)(5)
Type 1-4
HV
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Meter – MPB
CT – Customer
VT – Customer
Customer
Customer
Customer /
MPB (7)
MPB (7)
Customer (5)
Customer
Customer /
MPB (7)
Table 1 Notes:
1.3
1.
An up-front fee applies for Ausgrid supplied meters. This fee is documented in Ausgrid’s
Connection Policy – Connection Charges.
2.
External LCUs are provided at no cost to ASPs or MPBs (if requested).
3.
A fee applies to the installation of E4 meters. This fee is documented in Ausgrid’s
Connection Policy – Connection Charges.
4.
Ausgrid have available for sale LV CT’s that comply with the requirements of this document
5.
Where metering CTs are purchased from an external supplier (not Ausgrid) and installed
within Ausgrid’s distribution area, the customer must ensure that the CT’s are Rule
Compliant. Ausgrid will require test results certifying that installed CTs comply with the
National Electricity Rules, see Section 3 for further details
6.
The customer’s metering installation, including any associated current and voltage
transformers, must be located within the customer’s installation and external to Ausgrid’s
substation or equipment. Refer also to NS 195 HV Customer Connections (HVCs). Where
the customer’s metering equipment was previously installed in Ausgrid’s substation (e.g. a
HV metering unit), or embedded within Ausgrid’s switchgear (e.g. CTs and VTs), it must be
relocated into the customer’s installation and external to Ausgrid’s equipment, at the
customer's cost, where this metering equipment or switchgear requires replacement or
alterations for any reason
7.
Metering installation, ownership and maintenance arrangements are commercially
negotiated between retailer and customer
8.
Retail customer category is as per the National Energy Retail Law (NSW) Section 1,
subsection 5
9.
A small customer is a customer (a) who is a residential customer; or (b) who is a business
customer who consumes energy at business premises below the upper consumption
threshold of 100MWh per annum.
10.
A large customer is a business customer who consumes energy at business premises at or
above the upper consumption threshold of 100MWh per annum.
11.
Network tariff will be assigned as per ES7 Application of Network Use of System Charges.
Notification requirements for new metered installations
For all new Flat Rate or ToU metering installations, the metering installer must ensure a Retail
contract is in place and then obtain an Installation Job Number from the local Ausgrid Field
Operations office prior to installing metering and the site being energised. A completed 'Connection
Application' must be submitted to Ausgrid to obtain the Installation job number. See our
website http://www.ausgrid.com.au/Common/Our-network/Connecting-to-the-network.aspx for
information on submitting connection applications.
For all new Type 1-4 metering installations, the MPB is responsible for coordinating with the
customer’s licensed electrical contractor and ASP (e.g. service line installer) to ensure that the new
metering is commissioned at the time the customer takes supply and complies with all the
requirements defined in Ausgrid document ES 1 – Premises Connection Requirements. Customer
Installations must not be energised without a NER compliant Metering Installation installed.
The procedures detailed in Ausgrid publication ES 4 – Service Provider Authorisation must be
followed for energising whole current installations. Mandatory inspections are required for sites
greater than 100 Amps, see ES1 – Premises Connection Requirements for further details
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2
Metering requirements for small retail customers
2.1
Introduction
Ausgrid is responsible for the provision and maintenance of Flat Rate or ToU metering equipment
for use on small retail Customer Installations located within the Ausgrid distribution network as
required by the National Electricity Rules. The installation of these meters on new or upgraded
installations must be installed by an Accredited and Authorised ASP (see Ausgrid policy document
ES4 – Service Provider Authorisation for further details) and comply with the Service and
Installation Rules of NSW and this document.
Ausgrid provides Flat Rate or ToU metering instruments for all new customer sites and for existing
installations where Flat Rate or ToU metering is being altered, such as an increase in the number
of phases or the separation of supply for different customer accounts. The supply of the metering
instruments attracts an up-front charge
The meters, provided by Ausgrid for Flat Rate or ToU metered customer sites, comply with the
relevant National Electricity Rules requirements for Flat Rate or ToU Metering Installations. The
meters are whole current 100 Amp, bottom-connected instruments.
Installation or alterations of current transformer metering installations cannot be conducted by an
ASP, only Ausgrid’s metering provider may conduct this work.
The following abbreviations will be used to describe the range of meters provided by Ausgrid:
E1 − single phase, single element, Whole Current 100A ToU interval meter
E2 − single phase, dual element, Whole Current 100A ToU interval meter, with pre-programmed
−controlled load facility (ripple frequency relay or time switch) as required.
E3 − 3-phase, single element, Whole Current 100A ToU interval meter. (Note: This 3-phase meter
must only be used to meter a single tariff).
B1 − single phase, single element, Whole Current 100A Flat Rate accumulation meter.
B3 − 3-phase, single element, Whole Current 100A Flat Rate accumulation meter. (Note: This 3phase meter must only be used to meter a single tariff).
L – Load Control Unit - a ripple receiver or time switch for up to 25A switching of resistive load.
See clause 2.3.6 for more information on the requirements for controlled load.
Refer ES3, Part B Technical Specifications for Metering Equipment for details.
Note: Single phase dual element Flat Rate accumulation meter (i.e. B2), is not available. Where
load control is required at a Flat Rate metering installation an approved Ausgrid LCU must be
utilised.
Table 2 shows the standard whole current metering configurations for new and upgraded sites (e.g.
increase in the number of supply phases or the addition of an embedded generator).
2.2
Application of ToU and Flat Rate Metering Policy
Ausgrid provides both ToU and Flat Rate Whole Current metering equipment for ASPs to install at
new and upgraded installations connected or proposed to be connected to Ausgrid distribution
Network.
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2.2.1
New Installations
As of 1 July 2014, the standard metering to be used for metering new connections to the Ausgrid
distribution network will be a Flat Rate metering installation unless the requirements of this clause
require a ToU metering installation to be installed.
The following exceptions apply where ToU metering MUST be installed rather than Flat Rate:
•
Any installation where embedded generation systems are installed (e.g. solar);
•
A three phase <100A commercial (including residential house lights) or industrial metering
1
connection , excluding Temporary Builders Supplies, which will be removed the when
permanent supply and metering is installed;
•
Customers who wish to be billed via a time of use or demand capacity tariff;
•
Low voltage current Transformer metering installations which are not Type 1-4 (Ausgrid will
install the meter in this case as this metering work is non contestable);
It is critical that the ASP confirms with their customer if ToU metering is required. Ausgrid must be
notified on the Connection Application stage for new and upgraded metering connections if ToU
metering to support a time based tariff is required.
If an ASP installs a Flat Rate metering installation which is not in compliance with this clause a
defect will be raised against the ASP and the incorrect metering equipment must be replaced by
the ASP with the appropriate ToU metering installation.
2.2.2
Existing Installations
For existing connections which are proposed to be upgraded (e.g. additional phases) a like for like
policy applies (i.e. where a ToU metering installation is being upgraded the new metering installed
must be ToU). If a Flat Rate metering installation is being upgraded, a Flat Rate metering
installation must be installed unless the exceptions of clause 2.2.1 require a ToU meter to be
installed.
If an ASP is required to install additional metering at an existing single or three phase Flat Rate
metering installation (e.g. the addition of single phase controlled load metering) and does not meet
the exceptions of clause 2.2.1 where a ToU meter must be installed, the ASP may leave the
existing Flat Rate metering connected if it has a nameplate rating of 100A. The installed metering
configuration must still comply with the requirements of table 2.
1
It is assumed these connections would have a network tariff EA302 applied (see ES7 – Application of Network Use of System
Charges
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Table 2 Standard and net metering configurations
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2.3
Metering requirements
When installing new or altered metering it is essential that the minimum number of meters are used
and all metering installations must contain the minimum number of Data Streams.
The metering point must be located as close as practicable to the Connection Point as defined in
the Service and Installation Rules of NSW.
Where Metering Installations are changed or relocated, the metering enclosure must be accessible
to Ausgrid staff at all times in accordance with the requirements set out in the Service and
Installation Rules of NSW.
ASPs seeking Ausgrid supplied meters are required to forward a completed Connection Application
form (which is available at Ausgrid’s website via http://www.ausgrid.com.au/Common/Ournetwork/Connecting-to-the-network/How-do-I-connect-to-the-network/Connection-applicationforms-and-guides.ASPx )
Unless prior approval has been granted by Ausgrid to permanently disconnect a premises
connection from the Ausgrid Network, or it is an Ausgrid approved unmetered supply, all premises
must have revenue metering as per this document and the NER and installed to capture energy
usage and/or generation prior to being energised.
If metering equipment is removed, it must be returned as per clause 6 of this document
2.3.1
Metering equipment
Ausgrid’s procurement policies allow for numerous metering manufacturers to supply ToU and Flat
Rate metering equipment for use on Ausgrid’s Network. When installing metering the ASP must
ensure they have identified or specified the type of metering equipment that is to be installed as per
clause 2.2, prior to constructing any metering panels or switchboards. See ES3 Part B, Technical
Specifications for Metering Equipment for further technical details of metering equipment utilised in
the Ausgrid Network area.
2.3.2
Standard metering configurations
The standard metering configurations as set out in Table 2 are the preferred methods of metering
all new or upgraded installations. All new metering installations where Ausgrid Flat Rate or Time of
Use metering is installed shall comply with these requirements. All upgraded metering installations
should comply with these requirements unless the ASP seeks alternate configurations as per
clause 2.3.3 below.
Metering owned and installed by other MPBs need not comply with the configurations identified in
table 2.
2.3.3
Non-standard metering configurations
Any existing installations that require the installation of non-standard metering configurations as
identified in Table 2 must be approved by the local Field Operations office prior to carrying out this
work.
Ausgrid’s local Field Operations office should be contacted for metering advice if any other
alternative metering configurations need to be considered prior to carrying out any metering work.
For Meter Maintenance purposes, non-standard or other alternate configurations or metering types
may be used where site specific issues (e.g. insufficient space) will not allow for a metering
configuration identified in Table 2, to be installed.
Note:
2.3.4
Meter Maintenance may only be conducted by Ausgrid’s metering provider. Level 2 ASPs
or electrical contractors must not conduct any Meter Maintenance.
Protection of metering
All new and upgraded whole current metering installations must be protected by a 100A HRC fuse
on each phase. The HRC fuse must be located at the metering point. For exceptions to the location
requirement, contact your local Field Operations office for approval.
ES3 Part A - Metering Installations
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July 2015
2.3.5
Number of meters per installation
The minimum number of meters will be supplied to ASPs to meter the connected or proposed
tariffs of small retail customer sites in accordance with the requirements of this document and
Ausgrid publication ES7 – Application of Network Use of System Charges.
The arrangements for issuing meters to ASPs are detailed in Ausgrid publication ES 4 – Service
Provider Authorisation.
Additional meters, in excess of the minimum required for the installation (e.g. for future 3-phase
loads), will only be provided if the future load requiring the additional meters, is clearly indicated on
the Connection Application form stating what three phase equipment is to be installed. If E3 or B3
meters are installed, all operational line and load phases must be connected and energised to the
meter at time of energisation.
2.3.6
Customers with controlled loads
The E2 meter or LCU can only be issued for, and installed at a Customers Installation that are
entitled to receive a controlled load tariff. Only one load-controlled tariff is permitted at a Customers
Installation and must have an associated principal tariff (refer to ES7– Application of Network Use
of System Charges). Only one E2 or LCU can be installed at such customer installations.
The method of controlling loads at an installation will depend on the individual metering
arrangements required for that installation and the type of load to be controlled. The meter or LCU
will be supplied upon application by the ASP who has current Ausgrid Level 2 Category 4 Metering
Authorisation.
ASP’s should consult with Ausgrid’s local Field Operations office to clarify specific metering
arrangements, the availability of certain electronic instrument types and to ensure the correct
programming of the LCU.
As the E2 meter or LCU must be pre-programmed in advance for particular site locations, the local
Field Operations office will require the details of the ripple control switching frequency (e.g. 492,
750 or 1050 Hz) and channel (e.g. 103-15) or whether time switch control is required. These details
are to be provided by the ASP on the ‘Meter Requisition' form (available from the local Field
Operations office) when requesting a controlled load meter or LCU.
Ausgrid’s controlled load equipment (meters, LCUs etc) is rated for a maximum of 25 Amps
resistive load at single phase. For any two or three phase controlled load connections, loads of
greater than 25 Amps or reactive loads, the customer will be required to install a sealable contactor
at their cost. (See the Service and Installation Rules of NSW for additional information).
Where controlled load metering is installed for controlled load purposes, the ASP must indicate on
the NOSW which meter is connected to the controlled load circuit and what relay channel and
frequency or time switch setting is programmed into the meter or LCU.
Note:
2.3.7
The frequency or time settings must be obtained prior to connecting new metering and
load control equipment. One way to do this is to check the existing or neighbouring
installations (with their permission).
Customers that remove controlled load
Customers that no longer require controlled load (e.g. removal of a hot water system) must arrange
for the removal of the redundant controlled load metering and LCU. They must also ensure the
minimum number of meters remain at the installation. This may involve installing replacement
metering. For example:
•
Existing three-phase installations that contain ToU metering equipment where the load control
equipment is no longer required, must replace the existing metering and load control
equipment with an E3 meter (e.g. an existing installation may have 2, E1’s and an E2. If they
no longer require the controlled load equipment, all the existing metering is to be removed and
replaced with an E3 meter).
•
In existing single phase installations which contain ToU metering equipment and where the
load control is no longer required, either:
a)
E2 meter must be replaced with an E1 meter, or
b)
Controlled load E1/B1 and LCU must be removed and the E1/B1 (domestic
load) remains connected.
ES3 Part A - Metering Installations
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July 2015
2.3.7.1
E2 meter for controlled load use
When an E2 meter is provided as the control mechanism for the controlled load circuits of a
customer’s installation, the following precautions must be taken.
Both elements of an E2 meter must be utilised (i.e. primary and controlled load elements). Incorrect
installation of these meters will result in a major defect being issued against the ASP, which will
require immediate rectification.
An example of an E2 wiring diagram is provided in clause 2.3.12.3
Controlled load circuits must not be connected through the main principal tariff element of the E2
meter.
The unswitched terminal of the E2 meter can only be used for the following purposes:
•
Existing dual element hot water systems utilising the unswitched terminal for the top element
and the bottom element is supplied from the switched terminal: or
•
For inductive loads, which must be connected via a customer supplied contactor as per the
per the Service and Installation Rules of NSW; or
•
For loads greater than 25 Amps or multi-phase loads which must be connected via a customer
supplied contactor as per the Service and Installation Rules of NSW
With the exception of a Structure 26 gross meter, the uncontrolled terminal on an E2 meter can
only be utilised where a controlled load tariff is applicable. Note, both controlled and uncontrolled
terminal are connected to the same metering element.
The total combined current limit of an E2 meter must not exceed 100 amps. If the intended load is
greater than 100 amps, the local Field Operations Office must be consulted for approval of
alternative metering arrangements.
Ausgrid may utilise the E2 meter to replace faulty relays, time switches and associated meters on
existing Customer Installations. As the replacement of faulty Ausgrid supplied metering equipment
is a monopoly service, ASPs are not permitted to carry out Metering Maintenance
2.3.7.2
Load control unit (LCU)
A LCU will be provided for standard and non-standard configurations as described in Table 2. They
can be either a ripple operated relay or a time switch.
LCU’s must be wired according to the instructions on the relay and the standard wiring diagram in
clause 2.3.12.7.
Only one LCU is permitted per separately metered Customer Installation. Controlled load circuits
that have multi-phase loads, inductive loads or loads greater than 25 Amps must be connected via
a customer supplied contactor as per the Service and Installation Rules of NSW.
Where existing LCUs are installed and the metering is required to be upgraded to meet the
requirements outlined in this document, all existing LCUs must be replaced with new LCUs.
2.3.8
Mix of ToU and Flat Rate meters
New or upgraded metering installations must NOT have a mix of ToU and Flat Rate (including
electro-mechanical) meters.
Upgrading of existing installations with additional metering equipment is permitted, so long as the
requirements of Table 2 are met.
Example:
An existing Flat Rate installation with 1-phase principal tariff only, requires the
installation of metering for a controlled load tariff, if the existing principle tariff meter
is rated at 100A, the ASP should leave this meter onsite and only add a B1 and
LCU.
Prior to the installation of any new metering equipment where existing electronic meters are
installed, the ASP should contact Ausgrid’s Field Operations local office to determine if these
existing meters are ToU compatible. If they are ToU compatible they must only be replaced with an
appropriate ToU metering configuration as per table 2.
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2.3.9
Transferring meters from a builders service to the permanent installation
Existing whole current 100A rated metering instruments installed for a single domestic builders
service may be transferred to the permanent metering location for the same site. The builder’s
service and the permanent metering location must be on the same land title and same type of
installation.
Note:
This provision does not apply to builder’s services supplying a commercial, industrial or
multi-domestic development. This is provided that the meter(s) are not overloaded or
obsolete and the procedures outlined in ES 1 – Premises Connection Requirements and
ES 4 - Service Provider Authorisation are adhered to.
This includes the forwarding of separate NOSW forms for the removal and subsequent installation
of the metering equipment.
Note:
2.3.10
The two installations are considered as separate in terms of their Connection Application
and Ausgrid job number.
Relocating existing meters
Existing whole current meters (or 'meter panels' with metering instruments in situ) must not be
relocated to a new location (either on the same or a different meter panel) with the following
exceptions:
2.3.11
•
transferred in accordance with clause 2.3.9 of this document; or
•
existing Flat Rate (including electromechanical) or ToU bottom connected whole current
meters rated at 100 Amps (as indicated on the meter nameplate) may be relocated provided
the new location is within the same Customer Installation.
Flexible switchboard and panel wiring
Flexible switchboard and panel wiring such as “Triangle’s PVC Flexible V90 HT Panel Wires and
Switchboard Cable” may be used to connect service and metering equipment, provided it is
installed in accordance with the manufacturer’s specifications. In particular, the exposed bare
stranded conductors must be terminated into an approved (by the flexible cable manufacturer)
encapsulation device, such as a Bootlace Pin (BLP) that must be crimped with an approved (by the
encapsulation device manufacturer) crimping tool, before the cable is connected to service and
metering equipment.
The (thin-walled) metallic portion of the encapsulation device (BLP) must be of adequate length to
ensure effective connection under ALL termination screws of the service and metering equipment.
2.3.12
Standard wiring configurations for meters
Below are the standard generic wiring configurations for E1, B1, E2, E3 and B3 meters. These can
be used as a general guide but the specific wiring configurations can be found in ES3, Part B,
Technical Specifications for Metering Equipment or the inside of the terminal scoop cover of each
electronic meter.
Specific metering details, including reading register displays, mounting dimensions, drilling
templates and commissioning checks, can be found in ES3, Part B, Technical Specifications for
Metering Equipment.
Note 1: All metering devices contain a wiring diagram on the inside of the terminal scoop cover,
and they must be wired to this arrangement.
Note 2: In the following drawings, the following acronyms are used.
OP Sw is the switched terminal of the off second element of the electronic meter.
OP Cont is the continuous terminal of the second element of the electronic meter.
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2.3.12.1 E1 Single phase single element electronic meter
E1
kWh Meter
Import (Str 19)
Or
Import/Export
(Str 21)
Line
N
N
Load
Service Fuse
A
To Primary Load Main Switch
Service
Neutral
N
To Consumer’s Neutral Link
2.3.12.2 B1 Single phase element meter
B1
kWh Meter
Import (Str 01)
Line
N
N
Load
Service Fuse
To Primary Load Main Switch
A
Service
Neutral
N
ES3 Part A - Metering Installations
To Consumer’s Neutral Link
14
July 2015
2.3.12.3 E2 single phase dual element electronic meter with controlled load
E2
kWh Meter
Import (Str 20)
Or
Import/Export
(Str 23)
Line
N
N
Load
OP
Sw.
OP
Cont.
To Controlled Load Main Switch
(Big Blue Only)
To Controlled Load
Main Switch
Service Fuse
A
To Primary Load Main Switch
Service
Neutral
N
To Consumer’s Neutral Link
2.3.12.4 E3 three phase single element electronic meter
E3
kWh Meter
Import (Str 19)
Or
Import/Export (Str 21)
A Line A Load B Line B Load C Line C Load
N
To Primary Load Main Switch
Service Fuse
A
To Primary Load Main Switch
B
To Primary Load Main Switch
C
To Consumers Neutral Link
Service
Neutral
N
ES3 Part A - Metering Installations
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July 2015
2.3.12.5 B3 three phase single element meter
B3
kWh Meter
Import (Str 01)
A Line A Load B Line B Load C Line C Load
N
To Primary Load Main Switch
Service Fuse
A
To Primary Load Main Switch
To Primary Load Main Switch
B
C
To Consumers Neutral Link
Service
Neutral
N
2.3.12.6 E3 two phase single element electronic meter.
E3
Service Fuse
C Load
B Line B Load
C Line
A Load
A Line
kWh Meter
Import (Str 19)
Or
Import/Export (Str 21)
Blanking plate
installed, no
connection
N
To Primary Load Main Switch
A
C
To Primary Load Main Switch
N
Service
Neutral
ES3 Part A - Metering Installations
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July 2015
To Consumers Neutral Link
2.3.12.7 Load control device wiring diagram
kWh E1 Meter
Load Control
Unit
Controlled Load
Import
(Str 19)
Line
N
Line
Load
N
Load
Service Fuse
To Controlled Load
Main Switch
A
N
2.3.13
To Consumers
Neutral Link
Service
Neutral
Details required on the notification of service work form (NOSW)
The correct Structure as detailed in clauses 2.3.12.1 to 2.3.12.7, Table 2 and identified on the
electronic meter MUST be indicated in the tariff box on the NOSW form that is submitted to Ausgrid
for EACH electronic meter installed on the Customer’s Installation.
Note: Redundant acronyms such as “DOM” and “111” will not be accepted.
2.4
Application of tariffs
An appropriate Network tariff will be applied to all installed metering in accordance with the
requirements documented in Ausgrid publication ES7 – Application of Network use of System
Charges and the Ausgrid Network Price List.
The customer’s energy Retailer will advise the customer of the current applicable retail tariff
arrangements.
2.4.1
Reading of Flat Rate metering equipment
Ausgrid’s Flat Rate metering equipment display the total energy in kWh consumed by the
installation, accumulated from the date the meter is installed
2.4.2
Reading of Time of Use metering equipment
Ausgrid programs all ToU metering equipment with a standard display configuration that may
automatically or manually cycle (by pressing the display button on the meter) through a preset
formatted display. Each of these displays has a specific function (e.g. date/time, kWh’s) and a
register identifier.
If a customer wishes to read the display of their electronic meter, they should look at the display
readings on the meter and match them to table 3 (below) using the register (ID) identifiers as
reference.
Note: The meter time is not adjusted for daylight saving but is corrected in preparing meter data for
other purposes such as billing.
In general a subset of the following information in Table 3 is displayed on the registers indicated,
based on the Type of meter and structure.
ES3 Part A - Metering Installations
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July 2015
Table 3 Description of register displays for electronic metering
Registers
Structures
Example
ID
Function
19
20
21
23
25
26
27
29
88
Display
Test








Default display. Represents
the start of the scroll
All LCD
symbols
Date








Current date programmed
in meter
29:04:10

Current time programmed
in meter. (Time is not
adjusted for daylight
saving)
12:34:23

Total energy consumed by
the installation,
accumulated from the date
the meter is installed
3245.7

Total energy consumed by
the controlled load (off
peak) portion of the
installation, accumulated
from the date the meter is
installed
12568.3


Total energy produced by
the Complying Generator,
accumulated from the date
the meter is installed.
1025.6

Total energy consumed by
the Complying Generator,
accumulated from the date
the meter is installed.
12548.5

The excess energy not
consumed by the Customer
Installation that is
generated by the
embedded generation
installation and delivered
back to the local
Distribution Network,
accumulated from the date
the meter is installed.
125.2
1
Time







2
kWh
Import





3
kWh
Controlled


7
Gross kWh
Export


73
Gross kWh
Import



83
Net kWh
Export


93
2.5
Description
Metering equipment spacing requirements
For ALL new and existing Customer Installations a clearance of a minimum of 10mm must be
maintained around all sides of installed metering equipment.
2.5.1
Single metered installations
For all new sites containing a single Customer Installation the minimum space to be provided for
metering for each separately metered Customer Installation is:
•
380mm high x 380mm wide; or
•
300mm high x 480mm wide.
The location of this area must be from the top or bottom corner of the panel on the opposite side to
the panel hinge. This space is to be marked and labelled “Metering Equipment Only”. No customer
equipment may encroach on this area, with the exception of Service/Meter protection fuses
and/or the Service neutral link.
Any subsequent alterations or additions to the metering arrangements must comply with these
space requirements.
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2.5.2
2.5.2.1
Multiple metering installations
Single phase multiple domestic installations
For all new single phase multiple domestic Customer Installations the minimum space to be
provided for metering for each separately metered Customer Installation is:
•
270mm high x 170mm wide per unit.
These spaces are to be marked on the switchboard and labelled “Metering Equipment Only”. No
other equipment may encroach on this area, INCLUDING Service/Meter protection fuses and
neutral links.
Any subsequent alterations or additions to the metering arrangements must comply with these
space requirements.
2.5.2.2
Commercial and multi-phase multiple domestic installations
For all new commercial and multi-phase multiple domestic Customer Installations the minimum
space to be provided for metering for each separately metered Customer Installation is:
•
300mm high x 200mm wide per unit.
These spaces are to be marked on the switchboard and labelled “Metering Equipment Only”. No
other equipment may encroach on this area, INCLUDING Service/Meter protection fuses and
neutral links.
Any subsequent alterations or additions to the metering arrangements must comply with these
space requirements.
2.5.2.3
Automated metering reading (AMR) requirements
In addition to the metering areas detailed in clauses 2.5.2.1 and 2.5.2.2 the following additional
space must remain vacant:
•
270mm high x 170mm wide in accordance with the examples in table 4 below.
This vacant AMR space is to allow for the future installation of AMR equipment. This space is to be
marked on the switchboard and labelled “AMR Communication Equipment Only”.
These AMR spaces are only required at switchboards where there are more than three Customer
Installations per site. For any site where there are more than three Customer Installations, an AMR
space must be made available as per Table 4 below:
Table 4: AMR Requirements for Multiple Installations
2.5.3
Number of
Customer
Installations per site
Number of
AMR
Spaces
required
Number of
Customer
Installations
per site
Number of
AMR
Spaces
required
0–3
Nil
31 – 40
4
4 – 10
1
41 – 50
5
11 – 20
2
51 – 60
6
21 – 30
3
61 – 70
7
Existing metering installations
For ALL existing Customer Installations a clearance of a minimum of 10mm must be maintained
around the perimeter of installed metering equipment.
Where any existing Customer Installation is fitted with a new meter panel and surround, energised
after these requirements and any subsequent alterations or additions to the metering
arrangements, the minimum space to be provided for metering for each separately metered
Customer Installation will be as stated in clauses 2.5.1 and 2.5.2.
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July 2015
2.6
Fixing of metering equipment
In addition to the requirements of the Service and Installation Rules of NSW, all securing points
located on metering devices must not be tampered with, altered or modified in any way.
All metering devices must be secured by all fixing points with the appropriately sized bolt. The bolts
must be installed in such a manner that they will not cause any damage to any cable insulation
within the switchboard or cause any safety issues for persons working on the switchboard.
2.7
Metering requirements for embedded generation
These installations can be metered in either a Gross or Net Bi-Directional Metering configuration.
The metering configuration must use a ToU meter as per this document and meet the requirements
of the customer’s installation.
It is a requirement under the NERs that where small scale distributed generation facilities exist, Bi
Directional Metering must be installed as the standard metering configuration.
The metering requirements of this clause only apply to small scale embedded generation facilities
(e.g. embedded generator / inverter system) that are less than 10kVA per phase (up to a total of
30kVA) for Net Metered sites and 10kW in total for a Gross Metered Complying Generator site. For
installations greater than 10kVA per phase consult the local Field Operations Office for the correct
process for making a connection application.
All Bi Directional Metering will require specifically programmed electronic metering equipment
designed to record the consumption of energy that is both Exported and Imported by a Customers
Installation.
Embedded generation connected at a two-phase or three-phase installation must be metered with
an E3. ASP’s not following this directive will have the installation defected.
All Bi-Directional Metering must be individually requested in advance from the Ausgrid’s local Field
Operations office, and the ASP must clearly state in the application for the metering equipment,
that it is for the purposes of metering a Bi-Directional Metered Installation. Each Bi-Directional
meter will be specially marked to indicate the Structure that it has been programmed for, e.g.
“Structure 21” or “Structure 25” may appear on a label affixed to the meter.
All Bi-Directional Metering must be installed prior to the energising of the new or altered embedded
generation system.
The customer must liaise with their Retailer and ASP to determine the best arrangement for their
circumstance. A connection application must be submitted in advance and an Ausgrid job number
issued prior to commencing work on installations intended for metering embedded generation. (See
ES1 - Premises Connection Requirements for further details). Once completed, a NOSW must be
submitted to Ausgrid for all metering installed, removed and the NOSW must specifically identify
which meter is the Bi Directional meter and what Structure is programmed into EACH electronic
meter installed at the Customer’s Installation.
For information regarding the process for obtaining approval to connect a small scale embedded
generation system, refer to Ausgrid’s document ES1 - Premises Connection Requirements as well
as Ausgrid’s “Connecting to the Network” page on our
website http://www.ausgrid.com.au/Common/Our-network/Connecting-to-the-network.ASPx
Customers should contact their energy Retailer for specific details related to their electricity
account, and when they can expect to receive Solar Bonus Scheme credits or other Buy-Back tariff
related issues.
2.7.1
Details required on the notification of service work form (NOSW)
The correct Structure as detailed in Table 6 (for Net metered sites) and Table 7 (for Gross metered
sites) and identified on the electronic meter MUST be indicated in the tariff box on the NOSW form
that is submitted to Ausgrid for EACH electronic meter installed on the Customer’s Installation.
2.7.2
Embedded generation metering requirements
The metering requirements for metering embedded generation installations vary from the standard
metering outlined in Table 2. Only certain specifically programmed E1, E2 and E3 meters are
capable of registering Bi Directional energy flow. See Ausgrid’s document ES3 Part B, Technical
Specifications for Metering Installations for compatible Bi-Directional Metering equipment.
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July 2015
For information related to Gross Metering, refer to Clause 2.7.5.
2.7.3
Net metered embedded generation requirements
Where a customer proposes to connect a small scale embedded generation facility to an
installation for the purpose of generating electricity for use within their installation and/or exporting
any excess electricity back into Ausgrid’s Network, as a minimum a suitable Net Metered BiDirectional Metering configuration must be installed to capture the exported energy. This is required
even if the Customer’s Installation may not generate energy back into the Ausgrid Network. This
means that if the customer’s installation has any embedded generation, a Bi Directional Metering
Installation must also be installed. Table 2 outlines the configurations that may be used for a Net
Metered embedded generation systems. The wiring configuration is as specified in Clause 2.3.12
are suitable for Net Metered installations only.
Generation at multi-phase sites are permitted so long as they meet the requirements of ES1 Premises Connection Requirements.
For two or three phase 100A installations, irrespective of the number of phases of the generator, a
single E3 must be used. See figure 2.3.12.6 for wiring configuration of an E3 meter connected to 2
phase and 2.3.12.4 for the wiring of an E3 meter connected to 3 phase.
The standard Net Metering configurations are identified in Table 2 and the structures are identified
in table 6. The wiring diagrams for Net Metered installations are documented in clause 2.3.12 and
is the standard connection arrangement.
Table 6: Structures for net metered installations
2.7.4
Type of Meter for a Net
Metered Installation
Net Meter Program Structure to
be indicated on NOSW
Single Phase (E1)
Structure 21
Single Phase/Off Peak (E2)
Structure 23
Three Phase (E3)
Structure 21
Registration of bi-directional energy flow in ToU meters
The National Electricity Rules requires the measurement of import and export power flows to be
recorded separately. However there is also a requirement that the metering measurement is
consistent whether the generation is attached to single phase, two phase or three-phase
connections to the network.
All Ausgrid E3 meters add the instantaneous (maximum every second) power flow (magnitude and
direction) in each of the three phases. The resultant, depending on the dominant flow, is
accumulated in the import or export kWh register. This approach achieves the consistency across
the different network connection configurations and credits the customer for the full value of any
generation. This is particularly important in examples such as single phase embedded generation
systems connected to three phase supply. In such an example, the single phase generation will
offset any consumption in the other two phases.
This is also why a single E3 (rather than multiple E1’s) is mandatory for any embedded generation
connected to multi-phase installations, as detailed in Table 2.
The following example illustrates how the meter will record energy.
If the following unity power factor current is flowing through the meter:
•
A Phase 8 Amps consumption (1.84kW @ 230V AC);
•
B Phase 12 Amps consumption (2.76kW @ 230V AC);
•
C Phase 7 Amps generation (1.61kW @ 230V AC).
The resultant power flow registered by the meter would be +1.84kW + 2.76kW – 1.61kW ≈ +3.0kW
toward the premise.
The subsequent energy recorded by the meter would be based on this net power. Over a half hour
period, this would register +1.5kWh of energy being consumed at the premise.
ES3 Part A - Metering Installations
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July 2015
2.7.5
Gross metered embedded generation requirements
The standard Gross Metering configurations are identified in Table 7. The wiring diagrams for
Gross Metered installations are documented in this clause.
Table 7 Standard Gross Metering Configurations
Supply Arrangement
Gross Bi-Directional Metering
Configuration
Meter Program
Structures Required
in the Tariff column
on the NOSW Form
Principal
Meter
Gross
Buy
Back
Meter
Str 19
Str 25
Controlled
Load
Embedded
Generation
#
1
1-phase
None
1-phase
E1
Str 19
1a*
1-phase
None
1-phase
E2b
Str 26
2
3-phase
None
1-phase
E1b
Str 25
E3
Str 19
Str 19
Str 25
3
1-phase
1-phase
1-phase
E1b
Str 25
E2
Str 20
Str 20
Str 25
4
3-phase
1-phase
1-phase
E3
Str 19
Str 19
Str 27
5
3-phase
3-phase
1-phase
E3
Str 19
Str 19 / Str
19
Str 25
Item
Principal
Tariff
Key
E1b
Str 25
Str 26^
E2b
Str 27
E3
Str 19
E1b
Str 25
L
Electronic Meter: 1φ meter only. There is no load control
associated with this meter.
E1b
Electronic Meter: 1φ meter only, programmed for bidirectional energy measurement. There is no load control
associated with this meter.
Electronic Meter: 1φ meter with a 1φ load control element
(with internal ripple frequency relay or time switch). See
clause 2.1.6 for more information on the requirements for
controlled load.
E2b
Electronic Meter: 1φ meter with 2 metering elements, one of
which is programmed for bi-directional energy measurement –
See wiring diagrams below for element arrangement.
Electronic Meter:
3φ meter only. There is no load control associated with this
meter.
Load Control Unit (ripple frequency relay or time switch for
up to 25A switching. See clause 2.3.6 for more information
on the requirements for controlled load.
* Item 1a is for space saving situations only. If installed at a site where the arrangement under Item 1 could
have been installed, a defect will be raised against the ASP and metering will be required to be changed to
Item 1. Particular attention should be taken regarding the wiring configuration of this meter in Clause 2.7.5.2.
# For multi-phase embedded generators, contact the local Field Operations office for an appropriate Gross
Metering configuration.
^ The tariff applicable for this meter is to be located in the principal tariff column of the NOSW form.
ES3 Part A - Metering Installations
22
July 2015
If Net Metering is required in addition to the Gross Metering identified in the above table replace the
existing structure 19 meter with a structure 21 meter of the same type (E1, E2, E3). Clause 2.7.6
and Table 8 provide guidance on these configurations.
The following clauses contain the standard wiring diagrams required for the connection of a Gross
Metered installation. Specific wiring and technical details related to the individual metering devices
can be found in ES3 - Part B, Technical Specifications for Metering Equipment.
Each of the wiring diagrams below can be directly related to each item in Table 7 above.
2.7.5.1
Gross metering configuration 1
Single phase principal tariff with no off peak connection
2.7.5.2
Gross metering configuration 1a
Single phase principal tariff with no off peak connection
E2
kWh Meter
Import
and
Export / Import
(Str 26)
Line
N
N
Load
OP
Sw.
OP
Cont.
To Generator Main Switch
Service Fuse
To Primary Load Main Switch
A
N
Service
Neutral
ES3 Part A - Metering Installations
To Consumer’s Neutral Link
23
July 2015
2.7.5.3
Gross metering configuration 2
Three phase principal tariff with no off peak connection
E3
E1
kWh Meter
Import
(Str 19)
kWh Meter
Export / Import
(Str 25)
A
B
C
B
A
C
Line Load Line Load Line Load N
Line
N
Load
Service Fuse
To Generator Main Switch
A
To
Primary
Load
Main
Switch
B
C
Service
Neutral
N
2.7.5.4
To Consumers Neutral Link
Gross metering configuration 3
Single phase principal tariff with single phase off peak tariff
ES3 Part A - Metering Installations
24
July 2015
2.7.5.5
Gross metering configuration 4
Three phase principal tariff with single phase off peak tariff
E2
E3
kWh Meter
Export
and
Export / Import
(Str 27)
kWh Meter
Import
(Str 19)
B
A
B
C
A
C
Line Load Line Load Line Load N
Line
N
N
OP
Sw.
Load
OP
Cont
.
Service Fuse
To Controlled Load
Main Switch (Big Blue Only)
A
To Controlled Load Main Switch
To Generator Main Switch
B
C
To Primary Load Main Switch
To Primary Load Main Switch
To Primary Load Main Switch
Service
Neutral
N
2.7.5.6
To Consumer’s Neutral Link
Gross metering configuration 5
Three phase principal tariff with three phase off peak tariff
E3
E3
kWh Meter
Import
(Str 19)
kWh Meter
Import
Controlled Load
(Str 19)
A
B
B
C
A
C
Line Load Line Load Line Load N
B
A
B
C
A
C
Line Load Line Load Line Load N
Load Control
Unit
Line
N
Load
To Controlled Load Contactor
Service Fuse
A
Active
Link
Active
Link
To Controlled Load Main Switch
To Controlled Load Main Switch
B
To Controlled Load Main Switch
C
To Primary Load Main Switch
To Primary Load Main Switch
To Primary Load Main Switch
Service
Neutral
N
To Consumer’s Neutral Link
E1
To Generator Main Switch
kWh Meter
Export / Import
(Str 25)
Line
N
Load
ES3 Part A - Metering Installations
25
July 2015
2.7.6
Adding additional bi-directional metering
Customers that have existing embedded generation can add and separately meter additional
embedded generation systems. Those customers that are participating in the NSW Solar Bonus
Scheme will not have their eligibility affected provided the eligibility requirements of the scheme are
not breached for their Complying Generator.
The available configurations are:
•
•
Net and Gross
–
Alongside the existing Gross generation, convert the adjacent General Supply to Buy
Back metering – OR
–
Alongside the existing General Supply Buy Back metering, install Gross Generation
metering
Gross and Gross
–
Installing a second Gross generator alongside the first Gross Generator (but with no
change to the General Supply)
•
Net (non NSW SBS) and Net (non NSW SBS) on multiphase installations - permitted
•
Net (NSW SBS) and Net (Non NSW SBS) – Not permitted
Multiple separately metered Net systems on different tariffs (i.e. one Net NSW SBS systems and a
Net Non NSW SBS system) are not permitted as intermixture between the two systems could
occur.
2.7.6.1
General guide to follow
To add a new net metered embedded generation system, as a basic rule, remove the existing
structure 19 meter and replace it with a structure 21 meter.
To add a new gross meter the ASP must install a separately metered structure 25 gross meter or a
structure 29 meter as per table 8.
When completing metering the ASP must ensure the metering correctly aligns with the correct
embedded generation system, and this is to be noted on the NOSW.
Before connecting these systems, a Connection Application must be submitted to. Visit Ausgrid’s
website at http://www.ausgrid.com.au/Common/Our-network/Connecting-to-the-network/How-do-Iconnect-to-the-network/Connection-application-forms-and-guides.ASPx for further details.
When connecting embedded generation under a net metered arrangements, single phase
embedded generation connected to a three phase supply must utilise a three phase net meter to
ensure they receive the full benefits of their embedded generation.
Note: Voltage Rise calculations (as per Service and Installation Rules of NSW) will be required if
the total connected embedded generation on any phase equals 5kW’s or greater.
Table 8 below lists the most common standard supply arrangements and metering configurations
that Ausgrid allows to be installed. If the supply arrangement or metering configuration you require
is not listed below, contact your local Field Operations office.
ES3 Part A - Metering Installations
26
July 2015
Table 8: Acceptable Metering Configurations for Multiple Embedded Generation
ES3 Part A - Metering Installations
27
July 2015
2.7.6.2
Alternate Gross and Net metering configuration 2
Single phase principal tariff with net and gross generation
E2
kWh Meter
Import/Export
(Str 29)
Line
N
N
Load
OP
Cont.
OP
Sw.
To Gross Generation Main Switch
Service Fuse
To Primary Load Main Switch
A
N
Service
Neutral
ES3 Part A - Metering Installations
To Consumer’s Neutral Link
28
July 2015
2.8
Energising metering
Ausgrid’s document ES4, Service Provider Authorisation details the requirements for ASP’s when
energising works associated with their Authorisation agreement. Other checks that are specific to
metering are listed below and must be completed in conjunction with the checks required in ES4.
The ASP must:
•
Ensure that the meter is installed as per the requirements of ES 3 Part B, Metering
Specifications;
•
Ensure that the date on the meter display is correct if it is a ToU meter;
•
Ensure that the time on the meter is within 5 minutes of Australian Eastern Standard Time
(AEST) if it is a ToU meter. NOTE: the meters are set to AEST, during summer time the meter
time will show one hour slow;
•
Verify the readings on each energy consumption register, if it is not zero, then these reading(s)
must be included on the NOSW form for the installed meter;
•
Verify that upon energisation, all meters are registering correctly;
•
Verify that there has been no reverse energy flow on the meter by checking the appropriate
meter flags on the display (see ES3 Part B for more information in these visual indicators);
•
Verify that LCUs (if used) are suitable for the connected off peak tariff;
•
Verify that time switches (if used) have the correct on/off times;
If any of the above checks give an unsatisfactory result, Ausgrid’s local Field Operations office
must be notified immediately so that an Ausgrid technician can attend the site to rectify the error
found.
2.9
Metering With Remote Data Acquisition Capability
ASPs are not permitted to remove, install or alter metering which has remote data acquisition
capability, such as Type 1-4 metering (see clause 3 for further information on identifying a Type 1-4
metering installation) or other Ausgrid Network installed metering with communications (such as
chronic access or Advanced Metering Infrastructure (AMI) trials), unless the ASP has been directly
engaged by an AEMO Metering Provider to do so.
Remote communications can be typically identified by the connection of a modem to the meter’s
serial port under the terminal cover of the meter. The modem itself is typically also located under
the terminal cover and sometimes in an adjacent enclosure.
2.9.1
Remote communicating meters permitted to be removed
The only exception to this rule are meters with the meter prefix, LGA, LGB and LGC, see figure 1
for an example of what these meters look like. These meters were used for the Federal government
funded Smart Grid Smart City (SGSC) project which has now been completed. If an ASP attends a
site with this metering installed, the ASP is permitted to remove the meter and incorporated
communications unit (self-contained in the upper part of the meter) and associated antenna wiring.
The antenna array consists of two adhesive antennas. If the ASP can remove the antennas without
causing damage to the customers’ switchboard, the ASP must remove both antennas and
associated coaxial cabling. If the antennas cannot be removed due to the possibility of damaging
the customers’ switchboard, the ASP may cut the coaxial cable as close to the antenna as possible
and remove the coaxial cabling. In both of the above cases where the cabling is removed, the ASP
must ensure that the fire protection and moisture ingress capabilities of the switchboard are not
compromised.
ES3 Part A - Metering Installations
29
July 2015
Figure 1. Example of Smart Grid Smart City Meter
ES3 Part A - Metering Installations
30
July 2015
3
Metering requirements Type 1 - 4 metering
installations
Customers that have an annual consumption greater than 160MWh per annum must have Type 1-4
metering installed. Customer that have an annual consumption less than 160MWh per annum can
opt into Type 4 metering subject to the Retail offering.
Type 1-4 metering installations must have remote data acquisition capability (communications on
their metering equipment).
In addition to the requirements of this document, a Type 1-4 metering installation must also comply
to specific requirements of the NER and AEMO Metrology Procedures. This includes the allocation
of an MPB (to install and maintain the metering installation) and an MDP (to collect and process the
metering data from the meter).
The behaviour of the MPB is also governed by the AEMO Service Level Requirements for MPB’s
which includes the obligation to comply with the requirements of the local jurisdiction (such as
Service and Installation Rules of NSW) and the local network, such as described by this document.
The Metering Provider (MPB) and Meter Data Provider (MDP) must be appropriately accredited by
AEMO to provide the relevant metering services in the National Electricity Market for the Type of
metering installation installed.
Meter installers working on behalf of an AEMO accredited MPB, must also be accredited and
authorised by Ausgrid as a Level 2 Category 4 ASP at a minimum qualification. All metering
training, tools, testing equipment, metering equipment and associated documentation must be
provided by the MPB.
Only an AEMO accredited MPB may install, remove or alter a Type 1-4 Metering Installation.
A guide to the identification of an existing Type 1 – 4 metering installation is as follows:
For metering installations where Ausgrid MP is not the MPB, the meter is labelled with a third party
Metering Provider name, (for example Metering Dynamics or Integral Energy);
For metering installations where Ausgrid MP is the MPB that the meter is labelled with Ausgrid,
EnergyAustralia or TCA and has a program structure of structure 11, 22 or 72, which consist of the
following register displays:
Structure 11
Structure 22
Structure 72
Register
Number
Description
Register
Number
Description
Register
Number
Description
1
Date
1
Date
1
Date
2
Time
2
Time
2
Time
3
Total Export kWh
3
Total Export kWh
3
Total Export kWh
14
Total lag kVar
4
Total Import kWh
4
Total lag kVar
15
Total lead kVar
93
Total lag kVar
63
Total Import kWh
94
Total lead kVar
94
Total lead kVar
To install Type 1-4 metering installations in Ausgrid’s distribution area the MPB must engage a
metering installer who has current Level 2 Service Provider accreditation from the NSW Trade and
Investment as well as Category 4 authorisation from Ausgrid. See ES4 – Service Provider
Authorisation for further details.
The MPB is responsible for the quality of the work delivered by their meter installer. In particular,
any installation defects issued by Ausgrid will be issued and recorded against the metering installer
and for multiple breaches the MPB will be referred to AEMO.
ES3 Part A - Metering Installations
31
July 2015
3.1
Notification requirements for new installations
In addition to clause 1.3, for new CT Metered Installations the MPB must submit a completed
special NOSW form, Appendix A to Ausgrid as detailed below within two working days of
completion of a new Metering Installation as per the requirements defined in Ausgrid document ES
1 – Premises Connection Requirements. A Certificate of Compliance, Electrical Work (CCEW)
must be submitted to Ausgrid for any electrical work that is completed in association with the
metering work.
For new whole current Metered Installations the MPB must submit a completed special NOSW
form, Appendix A, a completed 'CCEW' form from the installing electrical contractor and any other
associated standard NOSW forms (e.g. for new service line) from ASPs, to Ausgrid as detailed
below within two working days of completion of a new metering installation as per the requirements
defined in Ausgrid document ES 1 – Premises Connection Information.
Where onsite generation is connected as a part of the new installation, the MPB must include
confirmation on the special NOSW form that the metering is programmed to register bi—directional
energy flows as required by the NERs.
The standard 'NOSW' form fees apply based on the ASPs grading – A, B or C, refer to Ausgrid’s
document Connection Policy – Connection Charges.
Special NOSW Form Lodgement Information
Fax: 1300 662 389
Email: datanorth@ausgrid.com.au
3.2
Notification requirements for existing installations
Where a Type 1-4 Metering Installation (including Bi-directional metering) is to be installed by
MPBs at an existing Customer Installation, a completed special NOSW form Appendix A showing
meter numbers and final meter readings must be submitted to Ausgrid as detailed in clause 3.1
within two working days of the meter replacement. A copy of the form must also be included with
the returned metering equipment. Refer to Appendix A for a copy of this special 'NOSW' form.
The standard 'NOSW' form fees apply based on the ASPs grading – A, B or C, refer to Ausgrid’s
document Connection Policy – Connection Charges.
MPBs must also notify Ausgrid if altering or removing non-Ausgrid Type 1-4 metering, within two
working days of the meter replacement. A completed special 'NOSW' form showing meter numbers
and final meter readings must be submitted to Ausgrid as detailed in clause 3.1.
Where onsite generation is existing or a new system connected, the MPB must notify Ausgrid via
the submission of a special NOSW form that the metering is programmed to register bi—directional
energy flows as required by the NERs.
Any completed electrical installation work must be notified (using a 'CCEW' form) to the local Field
Operations office within 14 days of work completion, as per regulatory requirements.
Any recovered Ausgrid metering equipment must be returned (in as found condition) to Ausgrid as
per the requirements in Section 6.
3.3
Entry to Ausgrid substations
Access to Ausgrid sub-transmission, zone or distribution substations for non-Ausgrid MPB’s is not
permitted. Instead, Ausgrid will carry out, free of charge, any work on the meter panel and any work
dealing with any secondary wiring directly related to the metering. Any work beyond this, for
example instrument transformer CT or VT testing will be charged at full cost recovery to the meter
installer. Ausgrid will enter a contractual arrangement with the MPB to allow these works to occur.
The MPB may witness the work and if so the MPB must comply with any instruction from Ausgrid
and must also comply with the requirements of Ausgrid’s Electrical Safety Rules.
Any alterations, upgrades and new metering must not be installed within Ausgrid’s substations.
To avoid future access inconvenience and expense it is strongly recommended that MPBs make
arrangements to relocate any existing metering equipment from within Ausgrid substations to the
customer’s premises wherever possible.
ES3 Part A - Metering Installations
32
July 2015
For any enquiries with regard to access to substations please contact Ausgrid using the following
email address bsp@ausgrid.com.au.
3.4
Commercial agreements
The new MPB must negotiate an agreement with Ausgrid or the incumbent MPB if it proposes to
re-use existing suitable metering equipment (owned by Ausgrid or the incumbent MPB).
3.5
Information on existing Ausgrid metering equipment
Ausgrid will on request provide MPBs or Market Participants with information on a customer’s
existing Ausgrid metering equipment (if available), where the MPB has been contracted by the
customer. Information would include:
•
technical specifications including meter numbers and instrument transformer ratios
•
meter location
•
test results of instrument transformers and metering if applicable.
Contact the Business Support section at Ausgrid using the email
address tcaquote@ausgrid.com.au for provision of the above information.
3.6
Metering data requirements
Where an existing Ausgrid Type 1-4 Metering Installation located within Ausgrid’s distribution area
is replaced with a new Type 1-4 Metering Installation in anticipation of future transfer to another
MPB, the MPB must via their selected MDP provide Ausgrid with meter data in NEM format from
the date the metering was installed up until the time of the market transfer as per the AEMO Meter
Churn Data Management Rules. This data must be provided at no cost. The MPB and Responsible
Person (RP) must follow the AEMO Metrology Procedure, MSATS Procedures and any other
relevant NEM procedures for the provision of data.
At existing Type 1-4 Metering Installations, MPBs must organise a final download of data with the
existing MDP before any metering is removed or replaced.
3.7
Compliance with Ausgrid’s safety plans
All ASPs working on behalf of MPBs carrying out work on or near Ausgrid’s distribution system
must have current Ausgrid Authorisation in accordance with conditions detailed in publication ES 4
– Service Provider Authorisation and fully comply with Ausgrid's Electricity Network Safety
Management System and Electrical Safety Rules.
Breaches of the conditions may lead to suspension or cancellation of the Authorisation.
3.8
Load control units (LCU)
Where controlled load is required it is the MPBs responsibility to arrange for a suitable LCU with the
appropriate frequency or time switch settings as per the customer’s requirements. Time switches
cannot be installed where frequency control is available. Ausgrid can provide an appropriate LCU
upon request.
3.9
Labelling and contact details
Type 1-4 Metering Installations installed by MPBs, must be clearly labelled with the name of the
MPB, on the meters or the meter panel.
Each metering installation shall be clearly labelled on each meter panel with the National Metering
Identifier (NMI) for the Type 1-4 Metering Installation.
3.10
Location of Type 1-4 metering installations
Clause 4.2.3.5 of the SIRs of NSW allows for remotely read meters to be located within a
customers tenancy at the customers expense. Ausgrid will allow Type 1-4 metering installations to
be located within a customers tenancy so long at the metering installation is accessible during
normal business hours.
ES3 Part A - Metering Installations
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July 2015
3.11
Checklist for Type 1 to 4 metering installations
This installation checklist is for the guidance of MPBs when carrying out installation of Type 1 to 4
Rule Compliant metering on customer’s installations within Ausgrid’s distribution area. These
installations must comply with the current versions of all of the following, as appropriate:
•
Service and Installation Rules of NSW
•
Ausgrid’s ES and NS Documents
•
AS/NZS 3000 Wiring Rules
•
AEMO’s Service Level Procedures: Metering Provision Services for the Provision, Installation
and Maintenance of Metering Installation Types 1 - 6
•
The National Electricity Rules
•
AEMO Metrology Procedure
The following list covers the specific requirements for Rule Compliant Type 1-4 Metering
Installations:
1.
The MPB must be or must employ an ASP with Ausgrid (Level 2 Category 4) authorisation to
carry out the installation of Rule Compliant Type 1-4 metering in Ausgrid's distribution area.
This is in addition to having appropriate MPB accreditation from AEMO.
2.
The appropriate paperwork must be submitted to Ausgrid as per clauses 3.1and 3.2 of this
document.
3.
A special NOSW form (appendix A) (including meter numbers and final meter readings)
must be submitted to Ausgrid as per clause 3.1 within two working days of work completion
where new Type 1-4 Metering Installation is installed on an existing installation. Recovered
Ausgrid metering equipment must be returned (in as found condition) within seven days of
recovery to one of the Ausgrid depots detailed in Section 6 and include a copy of the special
NOSW form.
When returning metering equipment, MPB’s must also comply with the requirements of
Section 6.
MPBs must also notify Ausgrid if altering or removing non-Ausgrid metering, within 2 days of
the meter replacement. A completed special NOSW form showing meter numbers and final
meter readings must be submitted to Ausgrid as per clause 3.2.
4.
CCEW forms must be submitted to the local Ausgrid Installation Data Operations office within
14 days of completed electrical installation work, as per regulatory requirements.
5.
New metering equipment installed by the MPB must be commissioned at the same time that
the customer takes supply. At no time should supply to the Customers Installation be left
unmetered.
6.
Clear labelling of the name and contact details of the MPB, must appear on either the meters
or the meter panel.
7.
Each metering panel must be clearly labelled with the National Metering Identifier (NMI).
8.
The installation must be metered correctly. LCUs should have correct time switch or frequency
and channel settings.
9.
The MPB must negotiate an agreement with Ausgrid or the incumbent MPB if it proposes to
re-use existing suitable metering equipment (owned by Ausgrid or the incumbent MPB),
(excludes Ausgrid’s LCUs).
10. On-site summation metering is generally not approved in Ausgrid’s network area.
11. The communications power supply must be appropriately double insulated or earthed.
12. Where NER Compliant Type 1-4 CT metering is installed, unmetered supply may be used
for the associated data and communications equipment only (e.g.modem). This equipment
must be connected to a sealable link on the load side of the meter test block (between the test
block and the metering) and sealed using and appropriate approved sealing system.
ES3 Part A - Metering Installations
34
July 2015
Where NER Compliant Type 4 whole current metering is installed, unmetered supply may be
used for the associated data and communications equipment only. However, where a metered
active link is already available (for that customers installation), the supply for the data and
communications equipment must be taken from this metered link.
The above mentioned data and communications equipment must be protected by a sealable
HRC fuse or circuit breaker with a maximum rated current of 2A (to grade with the 10A HRC
meter potential fuse, where CT or HV metering is installed). This equipment does not need to
be controlled by a separate main switch and must be direct wired to the supply (socket outlets
are not permitted). Communications equipment which is powered directly from the revenue
meter and has its own internal protection within the meter does not require additional fault
protection.
13. Adequate segregation must be maintained between extra-low voltage and low voltage cables
and equipment, within the communications unit and switchboard, in accordance with AS/NZS
3000 Wiring Rules.
14. For greenfield installations where the MPB is NOT the testing contractor, all of the
main/isolation switches must be sealed in the off position and tagged appropriately, in
accordance with ES4 – Service Provider Authorisation. This is to ensure that only the testing
contractor or the person responsible for re-testing the installation can energise the installation.
15. The MPB must apply seals at all appropriate termination points and at any other unmetered
sections of the Metering Installation.
16. MPBs must not interfere with or remove Ausgrid’s metering equipment without appropriate
authorisation or approval.
17. The installation must be suitably labelled with the correct instrument transformer ratios,
represented as the K factor for the site.
ES3 Part A - Metering Installations
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July 2015
4
Low voltage current transformer metering
requirements
The following information describes the metering specifications and associated requirements for
customers and their retailer/metering provider, wishing to connect to Ausgrid’s Network at low
voltage, three phase connections greater than 100A.
Customers must ensure that these requirements are incorporated into the planning of their
electrical installation.
Energisation of the switchboard will not be permitted unless the following specification and
associated requirements are met in full.
4.1
Prior to commencement of switchboard installation
Prior to the commencement of any prospective switchboard installation for low voltage connections
greater than 100A, the metering installation design and associated details must be submitted to
Ausgrid Installation Inspectors. This process is the switchboard pre-approval stage of construction
as required by the SIRs if NSW and should include the exact detail of:
(a) the specific Low voltage CT’s proposed for installation in a customer’s switchboard;
(b) the requirements of the primary conductors;
(c) the requirements of general installation and the secondary conductors;
must be submitted to Ausgrid Installation Inspectors (Field Operations office responsible for the
mandatory inspection as detailed in ES1) at the switchboard pre-approval stage of construction.
The requirements are detailed in the next sections.
4.2
Low voltage CT’s
Low voltage CT’s must be selected to ensure that the expected maximum demand of the primary
conductor falls between 25% and 100% of the CT’s primary rating.
Low voltage CT’s are available for sale from Ausgrid. Alternatively the customer can supply their
own CT’s
4.2.1
Low voltage CT’s supplied by Ausgrid.
Ausgrid supplied CT’s are sold through the Field Operations office. These CT’s fulfil the
specifications and associated Ausgrid requirements.
4.2.2
Low voltage CT’s not supplied by Ausgrid.
Low voltage CT’s not supplied by Ausgrid must fulfil the following requirements in full in order to be
approved for installation:
• Preferred CT Ratios of 200/5, 800/5, 1500/5 or 2000/5.
• CT burden rating of 5VA or 15VA.
• CT of Class 0.5S Extended Range 200% built to and design type tested to AS60044.1–2007
with evidence of such compliance through the presentation of type tests supplied from a
laboratory accredited by NATA or other Accreditation Body that is a signatory of the ILAC MRA).
• Supply Individual CT amplitude and phase accuracy test results (a) carried out in accordance
with AS60044.1-2007 (b) with the results traceable and sourced from a laboratory that is
qualified under ISO/IEC 17025-2005 General requirements for the competence of testing and
calibration laboratories and is accredited for that qualification by NATA or another accreditation
body that is a signatory of the ILAC MRA and (c) to a measurement uncertainty of ±0.1% for the
amplitude error and ±0.1 crad for the phase error, based on a 95% confidence level.
• Supply a Certificate of Compliance in PDF format detailing the individual test results, references
to the laboratory qualifications and a report number to uniquely identify the Certificate.
ES3 Part A - Metering Installations
36
July 2015
• Ensure that the individual test point results are supplied at the all of the following test point: 1%,
5%, 20%, 100%, 120% and 200% of rated current and tested at both 25% rated burden and
100% rated burden.
• Ensure that the supply of individual test results is delivered in in CSV, XLS or XLSX file format
with one result per row in the following columns format:
CT Serial
Number
Test Date
Ratio
% Rated
Current
% Rated
Burden
%
Amplitude
Error
crad
Phase
Error
Report
Number
• The above test reports must be provided to Ausgrid’s local field operation office, prior to
energisation of the switch board.
4.3
Low voltage CT primary conductor requirements
The arrangement is required to comply with the following:
4.4
•
If the customer's cables cannot be terminated at the service fuses, links or fixed terminals may
be used.
•
The length and arrangement of the primary cable between each CT and the corresponding
line-side terminal must be sufficient to permit flexing without tight bending of the cable when
installing the CTs. This length must not exceed 1000mm.
•
The line side terminals for the connection of cables passing through CTs must be located no
higher than 2700mm and no lower than 450mm from the ground, floor or platform from which
access is obtained.
•
Each cable must terminate in a separate lug. If the cable is terminated in a soldered or
crimped lug, the lug must be of dimensions which enable the CT to pass over it.
•
With the exception of stranded cables smaller than 95mm , space not less than 300mm is
required between the CT and the position where flexing of the cable is restrained by a conduit
or other fixture or joint on the load side of the CT.
•
The CT Unit is designed for surface mounting above or below 200 - 400A service fuses. When
the unit is installed above the service fuses, the layout of equipment of the unit and the
spacing between the unit and service fuses will remain as drawn. Other suitable arrangements
may be used provided the general principles are followed.
•
The customer is required to erect a 12mm thick, approximately 325mm x 435mm fire retardant
treated ply or similar panel in a suitable position on battens. Alternatively, an insulating panel
on a surround may be used.
•
The customer is required to provide and connect the metering wiring between the standard CT
unit and the metering panel.
•
A cover must be provided and installed by the customer if required to protect the CTs.
2
General requirements of CT installation and secondary conductors
The customer must also ensure that the annual electrical energy consumption of the installation
aligns to the Type of metering installation (Type 1-5) proposed to be installed. Consideration should
also be given to any expected load growth of the installation. The minimum requirements of the
metering installation Types can be found in Chapter 7 of the National Electricity Rules.
The installation must also comply with the current versions of NS 195, AS3000, AS2067, the
National Electricity Rules and AEMO Metrology Procedure.
4.4.1
CT metering test block requirements
In addition to clause 4.19.4 of the Service and Installation Rules of NSW, the meter test block shall
comply with the following requirements:
•
Shall be located on the front of the metering panel;
•
The voltage and current test links shall be of a slide link type that allows for an isolation point
and contain sockets at the top and bottom of the link allowing for the insertion of a test plug;
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4.4.2
•
The voltage and current test links shall be installed in such a way that the slide link will fall to
the closed position if released;
•
The cover of the test block must have a facility to be appropriately sealed by an approved
Metering Provider to prevent unauthorised access.
Secondary conductors
To clarify Table 4.5 of the Service & Installation Rules, the following table which details maximum
route length of secondary conductors, references the VA rating of the CT secondary circuit rather
than the primary maximum demand.
4.5
Conductor csa
2
(mm )
5VA Rated CT
Length in metres
15VA Rated CT
Length in
metres
2.5
10
20
4
16
32
6
25
55
10
40
90
Arranging metering for a low voltage CT installation
Any low voltage CT metering installation that requires Type 5 metering requires metering to be
arranged via Ausgrid. Type 5 LV CT metering is a monopoly function and fees apply for the Type 5
meter and for the installation of the meter. These fees are documented in Ausgrid’s Connection
Policy – Connection Charges.
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5
High voltage metering requirements
The following information defines the specifications and Ausgrid requirements for customers and
their retailer/metering provider, wishing to connect to Ausgrid’s Network at high voltage. Customers
must ensure that these requirements are incorporated into the planning of their electrical
installation. The customer must also ensure that the annual electrical energy consumption of the
installation aligns to the Type of metering installation (Type 1-5) proposed to be installed.
Consideration should also be given to any expected load growth of the installation. The minimum
requirements of the metering installation Types can be found in Chapter 7 of the National Electricity
Rules.
The installation must also comply with the current versions of NS 195, AS3000, AS2067, the
National Electricity Rules and AEMO Metrology Procedure.
5.1
Instrument transformer compliance
All instrument transformers that are to be used for National Electricity Market metering purposes
must comply with Chapter 7 of the National Electricity Rules and the AEMO Metrology Procedure.
Instrument transformers must have a valid pattern approval issued under the authority of the
National Measurement Institute or, until relevant pattern approvals exist, a valid type test certificate.
Note: all instrument transformer designs MUST have a valid type test certificate that meets the full
type test requirements of the appropriate Australian Standard even once the National
Measurement Institute pattern approval exemption is lifted.
Each individual instrument transformer MUST be supplied with routine test results to the
appropriate Australian Standard with traceability to National Standards and a statement of the
Estimated Uncertainty of Measurement. Note: depending on the class of instrument transformer,
different accuracy test points are required to be conducted on the transformer (e.g. class 0.5S CT
requires an additional test point at 1% and a class 0.5ME CT requires an additional test point at
2.5%).
All reference/calibration equipment used for the purpose of meeting the routine and type testing
obligations identified within this clause must be tested to ensure full traceability to test certificates
issued by either:
(a)
A NATA accredited body; or
(b)
A laboratory recognised under the International Laboratory Accreditation Corporation (ILAC)
mutual recognition agreement. Further details of ILAC laboratories can be found at
www.ILAC.org/.
It is the responsibility of the customer to prove to Ausgrid that the test reports supplied comply with
the above criteria. All test reports must be supplied to Ausgrid at least 2 weeks prior to the
installation of the instrument transformers. Once these reports have been submitted, Ausgrid will
review the reports and if the reports meet the requirements as defined by the National Electricity
Rules, they are accepted and the customer is then notified. The customer will also be notified if the
reports are unsuitable.
In addition, copies of the test reports must be forwarded by
•
post to:
VT/CT Test Results, - Metering Technology Group, Ausgrid
Unit 39-42, 11-21 Underwood Rd Homebush NSW 2137, or
•
fax to (02) 8719 3022 or
•
email to bsp@ausgrid.com.au
at least two weeks prior to the instrument transformers being installed.
If the type test and routine test are not supplied and accepted by Ausgrid, the installation
will not be energised.
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In addition to the above mentioned mandatory NER test requirements, the pre-commissioning tests
outlined in NS195 must also be completed and results provided to Ausgrid prior to the proposed
commissioning date.
5.2
Provision for instrument transformer testing
All instrument transformers that are used for National Electricity Market metering purposes are
required to be tested for accuracy at routine intervals as defined by the National Electricity Rules.
Consideration should be given in the selection and installation of all instrument transformers
associated with the metering, to ensure primary injection testing of an individual instrument
transformer is practically achievable.
5.3
Voltage transformers
All voltage transformers must be minimum class 0.5 for loads up to 1000GWh per annum, with a
minimum burden of 25VA and a voltage factor of 1.9. The customer must also consider site specific
requirements as outlined in the Australian Standards identified in the following clauses.
Where the VT or VTs are installed within other switchgear the nameplate details of each VT must
be indelibly and legibly marked on the outside of the switchgear.
5.3.1
Type 1 installations
If the installation is determined to be classified as a Type 1 metering installation then the VTs must
be class 0.2 with a minimum burden of 25VA and voltage factor of 1.9.
5.3.2
Single phase VTs
Single phase inductive voltage transformers shall be manufactured and tested to comply with the
current version of AS60044.2. Single phase capacitor voltage transformers shall be manufactured
and tested to comply with the current version of AS60044.5.
The secondary voltage shall be 110/√3 VAC per phase.
The secondary winding terminals shall be marked a1 and a2. The a1 terminal on each phase shall
be commoned and connected to an earth stud in the marshalling box. Where no marshalling box is
fitted the earth point shall be in the metering panel.
5.3.3
Three phase VT
Three phase voltage transformers shall be manufactured and tested to comply with AS1243 - 1982.
The secondary voltage shall be 110VAC line voltage.
The secondary star point shall be connected to an earth stud in the marshalling box. Where no
marshalling box is fitted the earth point shall be in the metering panel. The neutral star point must
be available at the secondary terminals.
5.3.4
VT secondary terminal boxes
If the VT or VTs are to be installed outdoors the secondary terminals shall be contained in an IP55
rated terminal box. The terminal box shall have at least two conduit entry points capable of
accepting 25mm conduit terminators and of the appropriate size to allow the easy termination of
conductors, allowing for a minimum bending radius of 25mm. The lid of the terminal box is to be
removable only by use of a tool and is to have the facility to be appropriately sealed by the
approved Meter Provider to prevent unauthorised access.
5.3.5
VT Circuit Protection
The primary circuit of the metering VT must be protected by a high speed protection device. The
customer is advised to contact the switchgear designer or manufacturer prior to installation in order
to determine the suitable protection device. Consideration should also be given to installation of a
primary protection device for the VT even when the VT is installed within a high speed protection
zone, this may prevent interruption of customer supply in the case of a VT failure.
The secondary circuit protection of the metering VT must be as per clauses 5.7, 5.9 and 5.11 and
as per the reference drawings available on the Ausgrid website.
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5.4
High voltage current transformers
Current transformers shall be manufactured and tested to comply with the current version of
AS60044.1. All CTs must be class 0.5S with a minimum burden of 5VA. The customer must also
consider site specific requirements as identified in this Australian Standard.
All new HV installations must use three single phase CTs with 1 amp secondary windings. Contact
Ausgrid’s Field Operations office to obtain details of the required CT ratio (or ratios if multi-tap CTs
are required because of anticipated load growth). If multi-tap CTs are used the maximum tap
setting must be equivalent to the rating of the associated switchgear. CT ratios appropriate to the
connected/anticipated load must be used.
Where possible, all CTs shall be installed so that the polarity of the HV terminals/P1 is facing the
source of supply. If the P1 side of the CT faces the source of supply then the S1 terminal will be
deemed to be the secondary polarity terminal. In the instance where CTs are installed in a stack
within a circuit breaker and the polarity of the HV terminals/P1 cannot be installed to face the
source of supply, the polarity of the secondary cabling is to be altered at the circuit breaker
marshalling box and a label shall be installed to indicate the altered polarity.
Where the CTs are installed within other switchgear their nameplate details of each CT must be
indelibly and legibly marked on the outside of the switchgear.
If the CTs are to be installed outdoors the CT secondary terminals shall be contained in an IP55
rated terminal box. The terminal box shall have at least one conduit entry point capable of
accepting a 25mm conduit terminator. The lid of the terminal box is to be removable only by use of
a tool and is to have the facility to be appropriately sealed by the approved Meter Provider to
prevent unauthorised access.
The CT secondary terminals shall be marked ‘S1’ to ‘Sn’. All CT ratios of multi-tap CTs must be
brought out to terminal studs. Where a marshalling box is used, all CT ratios shall be terminated
within the marshalling box. Where a marshalling box is not used, all CT ratios shall be terminated in
the metering enclosure.
CT non-polarities shall be commoned and connected to the earth stud in the marshalling box.
Where no marshalling box is fitted, the CT non-polarities shall be commoned and connected to
earth stud in the metering panel.
5.4.1
Type 1 Installations
If the installation is determined to be classified as a Type 1 metering installation, or there is a
chance that it may be determined as Type 1 in the future, then the CTs must be class 0.2S with a
minimum burden of 5VA. In addition to the three revenue CTs an additional three class 0.2 CTs
must be installed to provide the installation with full check metering.
5.4.2
Type 2 Installations
If the installation is determined to be classified as a Type 2 metering installation, or there is a
chance that it may be determined as Type 2 in the future, additional CTs will be required for partial
check metering. Partial check metering shall utilise a second set of CTs. These CTs may be part of
a CT circuit that is shared with other equipment as long as the shared circuits CTs have a class of
no more than double the required class of the revenue metering CTs. Where a shared CT circuit is
not available, a separate set of three CTs (one per phase) will be required with a class of no more
than double the required class of the revenue metering CTs.
5.5
High voltage combined transformers
Combined transformers shall be manufactured and tested to comply with the current version of
AS60044.3 and meet the appropriate requirements of this document.
5.6
High voltage metering installation documentation
Suitable drawings and supporting information, detailing the metering installation, must be submitted
as part of the customers Installation Safety Management Plan (ISMP) for maintenance and auditing
purposes.
5.7
Marshalling box
In situations where access to the terminals of each CT is not readily available for burden
measurement a marshalling box shall be installed as close as practical to the CT location.
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If the VT or VTs are installed remote from the metering location, a marshalling box shall be installed
as close as practical to the location of the VT or VTs to allow burden measurement.
The CT and VT secondary circuits may be terminated in the same marshalling box where required.
Depending on the instrument type that will be marshalled within, the box shall be of adequate size
to accommodate the following equipment:
VT/s
•
3 black HRC fuse holders. Alstom Safeclip SC20H or similar
•
1 white, HRC fuse holder. Alstom Safeclip SC20HWH or similar
•
Stud type terminals to terminate all VT secondary winding. (Utilux H3820 or equivalent).
Tunnel type links and slide links will not be accepted.
CTs
•
Stud type terminals to terminate all CT secondary wiring, including all ratios. (Utilux H3820 or
equivalent). Tunnel type links and slide links will not be accepted.
The potential fuses and link within the marshalling box shall have the facility to be appropriately
sealed by the approved Meter Provider to prevent unauthorised access.
All terminals shall have a cover that can be appropriately sealed by the approved Meter Provider to
prevent unauthorised access.
If the marshalling box is to be installed outside, an appropriate weatherproof enclosure is to be
used. It shall have at least two conduit entry points capable of accepting 25mm conduit terminators.
All fuses and links contained within the marshalling box/s shall be numbered and labelled
appropriately. A corresponding function table with each items function is to be laminated and
attached to the rear of the marshalling box/es access door.
5.8
Secondary cables
A stranded multi-core cable is to be installed between the CT/VT terminal boxes, marshalling box
and the metering panel in accordance with the requirements specified in the NSW Service and
Installation Rules and ES 1 - Premises Connection Requirements.
Cable size and maximum cable lengths for 1 amp CT secondary wiring shall be:
Conductor csa
2
(mm )
1A 5VA Rated CT
Length in metres
1A 15VA Rated CT
length in metres
2.5
180
430
4
230
700
6
350
1050
10
590
1750
16
930
2800
Cable size and maximum cable length for 5 amp (existing installations only) CT secondary wiring
shall be:
Conductor csa
2
(mm )
5A 5VA Rated CT
Length in metres
5A 15VA Rated
CT length in
metres
2.5
6
20
4
10
30
6
15
45
10
25
70
10
40
110
ES3 Part A - Metering Installations
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July 2015
Cable size and maximum cable lengths for VT secondary wiring shall be:
Conductor csa
2
(mm )
Length in metres
2.5
105
4
170
6
255
10
425
16
680
The CT and VT secondary cabling must be appropriately lugged using ring type terminal lugs and
terminated using a stud type terminal in the instrument terminal boxes and marshalling box (Utilux
H3820 or equivalent). The other end of the cable must be appropriately lugged using ring type
terminal lugs and terminated in the metering panel using a stud type terminal (Utilux H3820 or
equivalent).
All secondary cables shall be marked with a cable number to identify each cable within the
metering circuit. A cable number shall be on each end of a cable. The numbering shall be as per
the drawings as listed below and available via our website.
5.9
Metering panels and enclosures
The metering panel must be located in an area which is accessible during normal business hours.
The customer must make sure that access to the metering enclosure is never restricted or made
unsafe.
The minimum enclosure size per meter is 580mm (h) x 580mm (w), with the depth behind the panel
no less than 75mm.This panel shall be hinged and be capable of being opened to the 90º position,
additionally when the panel is in this position, a clearance of 200mm shall be maintained between
the front face of the panel and any fixed object. If check metering is to be installed, a separate
600mm (h) x 600mm (w) enclosure must be installed to accommodate the check metering and
associated equipment.
For metering installations where it is preferable to install multiple metering points on a single panel,
a panel layout design shall be submitted to Ausgrid’s Field Operations office during the design
stage of the installation for approval.
If the metering equipment is installed outdoors, an appropriate weatherproof enclosure is to be
used. The size of the enclosure will depend on the number of services to be metered, however the
enclosure size per meter shall be 580mm (h) x 580mm (w) x 250mm (d). Some installation
environments will require the metering panel enclosure to have an IP55 rating to prevent the
ingress of air borne particles, such as; coal dust etc. In corrosive environments, the enclosure shall
be made of a suitable material to prevent corrosion and to protect the metering equipment installed
within. It is the responsibility of the customer to ensure that these additional risks are identified in
the design stage and the appropriate equipment is selected. The enclosure shall be locked in
accordance with the NSW Service and Installation Rules. An Ausgrid approved locking system may
be used, details of this locking system can be found in ES1 - Premises Connection Requirements.
The CT and VT secondary cabling shall be terminated in the back of the metering panel using a
stud type terminal (Utilux H3820 or equivalent). These terminations shall have a cover that
prevents any contact with live exposed conductors and has the facility to be appropriately sealed
by the approved Meter Provider to prevent unauthorised access.
Isolation and test links shall be provided at the front of the metering panel. The isolation and test
links must have an insulated cover that when in position, no conductor is exposed and must also
have a facility to be appropriately sealed by an approved Meter Provider to prevent unauthorised
access.
The voltage and current test links shall be of a slide link type that allows for an isolation point and
contain sockets at the top and bottom of the link allowing for the insertion of a test plug. Phoenix
URTK/ or equivalent would be suitable for this purpose. These links shall be installed in such a way
that the slide link will fall to the closed position if released.
ES3 Part A - Metering Installations
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The details of the layout and wiring configuration shall be as per the list of drawings below.
Detailed copies of these drawings and check metering drawings can be obtained via Ausgrid’s
website http://www.ausgrid.com.au/NetworkStandardsDiagrams.aspx?docid=ES3 Part A
Drawing
Number
Title
5.10
Sheet
High Voltage Metering - Schematic Diagram, Wiring Diagram &
Panel Layout
221330
1
High Voltage Metering - Labelling & Equipment Details
221330
2
High Voltage Metering - Schematic Diagram, Wiring Diagram &
Panel Layout - Installation without Instrument Transformer
Marshalling Box/s
221331
1
High Voltage Metering - Labelling & Equipment Details
- Installation without Instrument Transformer Marshalling Box/s
221331
2
High Voltage Metering - Schematic Diagram, Wiring Diagram &
Panel Layout - Installation with Auxiliary Supply
221332
1
High Voltage Metering - Labelling & Equipment Details
- Installation with Auxiliary Supply
221332
2
High Voltage Metering - Schematic Diagram & Wiring Diagram
- Installation with Check Metering
221333
1
High Voltage Metering - Panel Layout, Labelling & Equipment
Details - Installation with Check Metering
221333
2
High Voltage Metering - Schematic Diagram & Wiring Diagram
- Installation with Check Metering and Auxiliary Supply
221334
1
High Voltage Metering - Panel Layout, Labelling & Equipment
Details - Installation with Check Metering and Auxiliary Supply
221334
2
Earthing
As stated in clauses 5.3.2 and 5.3.3 the VT or VTs secondary star point shall be connected to an
earth stud in the marshalling box. Where no marshalling box is fitted the secondary star point shall
be earthed in the metering panel. The star point is to be earthed at only one point in the installation
as close as possible to the source.
As stated in clause 5.4 CT non-polarities shall be commoned and connected to the earth stud in
the marshalling box. Where no marshalling box is fitted the CT non-polarities shall be commoned
and connected to earth stud in the metering panel. The CT non-polarities shall be earthed at only
one point in the installation.
The marshalling box enclosure/s, the metering panel enclosure/s and all metal components
installed within the metering panel and marshalling box/es shall be earthed. The earth cable size
for a marshalling box enclosure installed in a high voltage switchyard shall be of adequate size to
handle the expected fault current specified for the yard. The same applies to the metering panel
enclosure which is installed in close proximity to high voltage mains and apparatus, see Ausgrid’s
document NS 222, Major Substation Design Layout for further detail. The metal components
installed within the marshalling box and the metering panel shall be earthed with at least a 4mm²
cross sectional area conductor with a green/yellow sheath.
5.11
Fuse ratings
All potential fuses should be installed to allow for cascading discrimination. Fuse sizes are to be as
follows:
•
Marshalling box – 10A
•
Metering Panel – 4A
•
Communications fuses – 2A
ES3 Part A - Metering Installations
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July 2015
5.12
Labelling
All equipment shall be numbered and labelled as per the appropriate drawing. The label type for all
fuses and terminations shall be the engraved type and shall be adequately secured. All fuses and
neutral links shall have a label on the base along with a label on the fuse/link holder. A label
schedule with details of the metering panels labelling can be found in the appropriate drawing.
A function table shall be attached to the rear of the metering panels access door or on the panel
itself if an enclosure is not used. A function table should also be attached to the rear of the
marshalling box/es access door. The function table shall indicate the function of each component
and the fuse size where applicable. An example function table for the metering panel can be found
below, it may be printed out, laminated and attached as required.
In all instances the metering panel shall be clearly identified. This is achieved by the use of an
engraved type label with the word “METERING”. This label shall have minimum 20mm high
lettering and shall be adequately secured to the metering panel.
If a marshalling box is used, it shall be clearly identified. This is achievable by the use of an
engraved label with words describing the equipment installed within, the voltage level and the
service that the equipment is installed on.
Any marshalling box and/or metering panel/s installed outdoors and a weatherproof enclosure is
used, these labels shall be UV rated and shall be secured to the outside of the enclosure lid, the
label shall be secured to prevent the label falling off due to the effects of weather. The enclosure
must retain its IP rating after the installation of any label.
The metering panel shall be marked appropriately with the site address and the location of the VTs
and CTs, if installed remote from the metering panel. If an auxiliary supply is used identified in
clause 5.13, the location of the circuit protection shall also be marked on the metering panel.
The following drawing of a HV metering panel function table can be used as a guide.
HV Metering panel – function table
ES3 Part A - Metering Installations
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July 2015
5.13
Auxiliary supply
Whilst it is not a requirement to make provision for an auxiliary supply it may in some cases be of
benefit to make a separate 110V AC supply available at the metering panel/s, this would allow the
meter/s and communications device/s to be energised from a source independent of the VT
allowing the metering and communications to remain energised at times when the VT is not in
service. This is especially useful for standby supplies that may only be energised occasionally. For
installations where this auxiliary supply is used it is a safety requirement to ensure that voltages of
different levels do not exist at the meter/s. A two winding transformer with an output of 110V AC
may be used to ensure this voltage segregation. If an auxiliary supply is to be used separate
detailed drawings of this connection method. The drawings can be found as per clause 5.9 above.
5.14
Information required prior to electrification
The following information is a summary of what is required before energising a HV metered
installation.
•
Proof that the type of metering installation complies with the National Electricity Rules (clause
5)
•
CT and VT test reports have been submitted to Ausgrid (clause 5.1)
•
Drawings detailing the metering information (clause 5.6)
•
For metering installations with multiple metering points, a panel layout design shall be
submitted to Ausgrid’s Field Operations office during the design stage of the installation for
approval. (clause 5.9)
ES3 Part A - Metering Installations
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6
Returning of Metering Equipment
When returning metering equipment and associated devices (e.g. LCU) to an Ausgrid Field
Operations depot, the ASP must ensure that the meters are separated into the appropriate
mechanical and electronic crates to allow for ease of sorting. In addition returned CTs must also be
placed in the appropriately labelled crate. Only Ausgrid meters are to be returned to Ausgrid Field
operations depots.
To avoid injury to Ausgrid staff, injury to others and damage, the following should be adhered to:
•
All equipment mounting screws must be removed.
•
All residual cable must be removed from terminals.
•
All equipment screws must be tightened (to avoid possible loss of screws in transit).
•
All equipment that is removed from the meter board must be wet wiped with a damp rag to
remove any surface dust immediately following the removal of the equipment.
•
If the electrical board or any other part of the metering enclosure is suspected of containing
asbestos, then the rags should be disposed of as asbestos-contaminated waste.
•
If the electrical board is suspected of containing asbestos, then procedures, safety controls
and personal protective equipment that are described in the procedure 'Safe Work Practice 5 Working on Electrical Mounting Boards Containing Asbestos' must be applied.
Note:
The procedure, 'Safe Work Practice 5 - Working on Electrical Mounting Boards
Containing Asbestos' can be found in the document 'Work Cover NSW Code of Practice:
How to manage and control asbestos in the workplace'. This document can be obtained
from the Work Cover NSW website under 'Publications' (catalogue number WC03560).
ToU and Flat Rate metering equipment is to be returned to the local Field Operations office as
detailed in ES1 - Premises Connection Requirements.
Type 1-4 metering equipment is to be returned to the locations below. This is to be completed
within seven days of recovery.
Pymble
982-984 Pacific Highway
Pymble NSW 2073
Wallsend
Building 3
Abbott Street
Wallsend NSW 2287
Zetland
Ground Floor, Building 6
130 Joyton Avenue
Zetland NSW 2017
Tuggerah
Suite 4
14 Pioneer Ave
Tuggerah NSW 2259.
ES3 Part A - Metering Installations
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Appendix A – Special NOSW form, meter types 1- 4
ES3 Part A - Metering Installations
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Appendix B – Obsolete zellweger ZE22/3 load control
relays
A small number of Zellweger ZE22/3 load control relays presently installed on customer’s
installations within Ausgrid's distribution area may pose a personal safety risk if not handled
correctly. ZE22/3 relays contain a glass tube that contains a low-level radioactive material. Whilst
the glass tube remains intact, the radioactive material is not considered hazardous to people.
Figure B1: Photograph of a Zellweger ZE22/3 relay (right most instrument)
As a precautionary measure, ONLY Ausgrid staff who are specially trained and equipped to safely
handle the ZE22/3 relays are permitted to remove these devices from customer’s installations e.g.
due to a building demolition. All other service providers and personnel must contact a local Ausgrid
Metering Operations representative (see contact details below) to arrange for this work to be
carried out by the specially trained and equipped Ausgrid staff.
Note:
Existing ZE22/3 relays are not permitted to be relocated on a customer’s installation (refer
to clause 2.3.10 of this document).
The ZE22/3 relay has a ‘lower terminal cover’ and an ‘upper relay cover’. Removal of the ‘lower
terminal cover’ by service providers (Level 2, Category 4 - Metering) whilst the ZE22/3 relay is in
situ, is not considered to expose personnel to safety risks due to the radioactive material. However,
the ‘upper relay cover’ must NOT be removed, as this could expose personnel to the risks
associated with the radioactive material.
Ausgrid is currently carrying out the bulk replacement of all ZE22/3 relays installed throughout
Ausgrid’s distribution area.
Any return meter crates containing ZE22/3 relays should NOT be transported, as there are strict
rules on the transportation of hazardous substances. Contact the local Field Operations
representative (see contact details below) to arrange for the ZE22/3 relays to be collected.
If anyone should inadvertently come into contact with the glass tube contained within a ZE22/3
relay, they should immediately wash their hands/skin thoroughly with soap and water. If the glass
tube is broken and a person comes into contact with its contents, they should immediately seek
professional medical advice as a precautionary measure.
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Local Ausgrid representatives
Contact the local Ausgrid representative (Metering Operations field team leader) in the appropriate
Field Operations region where an existing ZE22/3 relay (installed on a customer’s installation) is
required to be removed. Contact should be made well in advance to ensure the timely completion
of the job by Ausgrid.
Location (Field Operations region,
where the ZE22/3 relay is installed)
Contact Telephone Number
(Ausgrid Representative)
Hunter
(02) 4951 9517
Central Coast
(02) 4399 8078
Sydney North
(02) 9269 7353
Sydney South
(02) 9663 9388
The Field Operations representative will request the following information:
•
Name and contact telephone number of the service provider or electrical contractor making
the request
•
Site address where the ZE22/3 relay is installed
•
General condition of the relay
•
Why the relay is being removed e.g. building demolition
•
Number of relays to be removed
•
The number of poles on the relay, the signal frequency (492, 750 or 1050 Hz) and the current
tariff of each pole, (where the relay is being replaced by Ausgrid (as contestable work), rather
than just removed)
•
Level of urgency of the job (when the job is required to be completed).
ES3 Part A - Metering Installations
50
July 2015