DECISION PAPER
PROPOSED MODIFICATIONS TO THE TRANSMISSION CODE
12 AUG 2015
ENERGY MARKET AUTHORITY
991G Alexandra Road
#01-29 Singapore 119975
www.ema.gov.sg
Please direct any enquiries by e-mail to: EMA_ER@ema.gov.sg
Disclaimer:
The information in this Consultation Paper is not to be treated by any person
as any kind of advice. The Energy Market Authority shall not be liable for any
damage or loss suffered as a result of the use of or reliance on the information
given in this Consultation Paper.
1
Introduction
1.1. The Transmission Code sets out the rights and obligations of the Transmission
Licensee, together with the rights and obligations of users of the Transmission
System. The Transmission Code also sets out the technical requirements to be
met by those who seek to connect and operate installations on the
Transmission System.
2
Proposed modifications to the Transmission Code
2.1. Pursuant to Section 1.6 of the Transmission Code, EMA had sought feedback
on the proposed modifications to the Transmission Code to provide clarity and
updates to the technical requirements of the Transmission Code. These include
requirements relating to generating units, solar photovoltaic installations, data
and voice communications, and cable damage preventive measures.
2.2. Feedback was received from 12 parties when the consultation closed on 30
September 2014. EMA has carefully considered the feedback and our
responses are at Appendix 2.
3 EMA’s Decision
3.1. Taking into account the feedback received, EMA has decided to modify the
Transmission Code as set out in Appendix 1. The proposed modifications will
come into effect on 1st September 2015.
Appendix 1
Proposed Modifications to the Transmission Code
Modification
Ref. No.
Clause
Original Text
Modified Text
Reasons
TC/2014/1
6.11.1
The
generating
unit’s
step-up
transformers and generating unit’s
switchboard
(or
switchgear)
for
connecting the high voltage side of the
generating unit’s step-up transformers
and the associated switching and
protection/control equipment shall be
designed
such
that
no
single
failure/outage shall cause simultaneous
outage of two or more generating units
connected to the switchboard. All
switchboards shall be designed with oneand-half breakers configuration, unless
the Generation Licensees submit with
justifications the use of a different
switchboard configuration for the Power
System Operator’s consideration.
The generating unit’s step-up transformers and
generating unit’s switchboard (or switchgear) for
connecting the high voltage side of the generating
unit’s step-up transformers and the associated
switching and protection/control equipment shall be
designed such that no single failure/outage shall cause
simultaneous outage of two or more generating units
connected to the switchboard. All switchboards shall
be designed in accordance with Appendix I1.4 with
one-and-half breakers configuration, unless the
Generation Licensees submit with justifications the
use of a different switchboard configuration for the
Power System Operator’s consideration.
To align with the current Code
requirements as set forth in
Appendix I1.4.
TC/2014/2
6.11.2(b)
All generating units shall be designed such
that:
All generating units shall be designed such that:
To exempt generating stations with
generating unit(s) of rated capacity
below
100MW
from
the
requirement to have Black Start
Capability as such generating
stations have limited capability to
energize the network during a
black start condition.
the generating station has Black Start
Capability unless exempted by Power
System Operator;
each generating station with any generating unit(s) of
rated capacity 100MW and above is required to have
Black Start Capability the generating station has Black
Start Capability unless exempted by Power System
Operator;
Modification
Ref. No.
Clause
Original Text
Modified Text
Reasons
TC/2014/3
6.12.3
The
Transmission
Licensee
and
Generation Licensee shall provide all the
equipment at their respective site,
including the communication equipment.
The Transmission Licensee shall provide
data communication lines from the
control centers of the Power System
Operator to the transmission substation
and power station switchhouses as
specified by the Power System Operator
for the purposes of real-time power
system monitoring and control. All the
equipment at the site shall be equipped
with battery backup of at least 4-hour
operation time. In addition, the AC power
shall also be backed up by the standby
generator at the site, if the site is
equipped with such a facility.
The Transmission Licensee and Generation Licensee
shall provide all the equipment at their respective site,
including the communication equipment. The
Transmission
Licensee
shall
provide
data
communication lines from the computer room in the
control centers of the Power System Operator to the
transmission substation and power station generating
station switchhouses as specified by the Power System
Operator for the purposes of real-time power system
monitoring and control. The Generation Licensee shall
be responsible for the data communication lines from
the Generation Licensee’s equipment to the
Transmission Licensee's termination box located in the
generating station’s switchhouse. The termination
box, which shall be provided by the Transmission
Licensee, shall also be used for termination of the
Transmission Licensee’s data communication lines. In
the event of relocation of the termination box or
diversion of the data communications lines, the
Licensee that initiates the relocation or diversion shall
bear all the costs necessary for the relocation or
diversion including the costs incurred by any other
affected Licensee to divert the data communication
lines at the affected Licensee’s end caused by the
relocation or diversion. All the equipment at the site
shall be equipped with battery backup of at least 4hour operation time. In addition, the AC power shall
also be backed up by the standby generator at the
site, if the site is equipped with such a facility.
To provide clarity on the division of
responsibility
between
the
Transmission Licensee and the
Generation Licensee for the
communication lines.
Modification
Ref. No.
Clause
TC/2014/4
6.12.7 (new)
Original Text
New Clause
Modified Text
Reasons
Owners of solar photovoltaic installations with an
installed capacity of 100 kWac or above at each
site/facility which is connected to the grid, shall
provide the Power System Operator with the following
signals which are sampled and transmitted at 1 minute
intervals. Detailed requirement shall be provided by
the Power System Operator upon request.
To facilitate the monitoring of
power
output
from
solar
photovoltaic installations with an
installed capacity of 100kWac or
above, and ensure that there is
sufficient reserve capacity available
in the system to respond to sudden
fluctuations in solar PV output so
as to maintain power system
security and reliability.
•
Active Power (gross) at the AC-side of the solar
photovoltaic installation.
TC/2014/5
8.4.2
New Clause.
8.4.2 The Generation Licensee shall ensure that its
generation facilities and generating station premises
have adequate protection and preventive measures
against lightning strike and fire, and comply with the
requirements of IEC, BS, SS, or other equivalent
international standards.
To ensure that generation facilities
and generating station premises
are protected against fire and
lightning strikes which affect the
operation of generating units. This
is to ensure the reliability and
availability of generating units so
as to maintain power system
security and reliability.
TC/2014/6
9.4
New Section
9.4 Cable Damage Preventive Measures
To ensure that Transmission
Licensee’s electricity cables in
generating station premises are
protected from damage by
earthworks so as to ensure power
system security and reliability.
9.4.1 The Generation Licensee shall implement
measures to ensure that electricity cables belonging to
the Transmission Licensee, which are laid in the
generating station premises, are protected from
damage by any earthworks carried out in the
premises, including but not limited to the following:
Modification
Ref. No.
Clause
Original Text
Modified Text
Reasons
(a) providing clear markings of 400kV, 230kV and
66kV cables routes within the generating
station premises;
(b) establishing a standard operating procedure
(“SOP”) for earthworks carried out within
generating station premises in compliance
with the cable damage prevention provisions
in the Electricity Act; and
(c) implementing, as part of the SOP, a Permitto-Work (“PTW”) system to ensure that
contractors seek the Generation Licensee’s
approval before they commence earthworks.
9.4.2 The Transmission Licensee shall keep up-to-date
digital mapping or records of their high voltage cables
installed in and under public places, in such form as is
accessible by other utilities service providers or such
other persons who require such information for
locating the high voltage cables prior to
commencement of earthworks.
TC/2014/7
C1.3 (d)
C1.3 Generating unit performance
parameters
C1.3 Generating unit performance parameters (d)
Generating unit step-up transformer
(d) Generating unit step-up transformer
•
Rated MVA Capacity ______ MVA
•
Rated MVA Capacity ______ MVA
•
Rated voltage
•
Rated voltage
−
Primary ______ kV
The requested information is
required for a connection applicant
to
demonstrate
to
the
Transmission Licensee and the
Power System Operator that the
applicant’s proposed installation
meets the Transmission Code
requirements.
Modification
Ref. No.
Clause
Original Text
−
Primary ______ kV
−
Secondary ______ kV
•
Nominal voltage ratio,
primary/secondary ______
•
Positive sequence impedance at
−
Maximum tap ______ %
−
Minimum tap ______ %
−
Nominal tap ______ %
•
Zero phase sequence impedance
______ %
•
Tap changer range + ______ %
- ______ %
•
Tap changer step size ______ %
•
Tap changer type on load / off load
•
Winding connection and Vector
Group ______
•
Magnetising curve
•
Earthing resistor of transformer (if
any)
−
At Primary side ______
−
At Secondary side ______
Modified Text
−
Secondary ______ kV
•
Nominal voltage ratio, primary/secondary ______
•
Positive sequence impedance at
−
Maximum tap ______ %
−
Minimum tap ______ %
−
Nominal tap ______ %
•
Zero phase sequence impedance ______ %
•
Tap changer range + ______ %
- ______ %
•
Tap changer step size ______ %
•
Tap changer type on load / off load
•
Winding connection and Vector Group ______
•
Magnetising curve
•
Earthing resistor of transformer (if any)
•
−
At Primary side ______
−
At Secondary side ______
Report on predicted transformer energisation
performance including electromagnetic transient
studies unless otherwise agreed with the PSO.
Reasons
Modification
Ref. No.
Clause
Original Text
TC/2014/8
C1.3 (h)
Generating unit performance parameters
Generating unit performance parameters
(h) Gas Turbine Units (Open Cycle and
Closed Cycle)
(h) Gas Turbine Units (Open Cycle and Closed Cycle)
•
Rated MW Capacity
•
Rated MW Capacity
•
Performance data and curves:
•
Performance data and curves:
−
Power vs. Fuel Consumption
−
Power vs. Fuel Consumption
−
Exhaust Temperature vs. Fuel Consumption
−
Exhaust Temperature vs. Fuel
Consumption
−
Power vs. Ambient Temperature
−
Power vs. Ambient Temperature
−
Power vs. Speed
−
Power vs. Speed
−
Inlet Guide Vane effects
−
Inlet Guide Vane effects
•
•
Functional description and block
diagram showing transfer
function of individual element of
gas turbines units (including
effect of Ambient Temperature)
in PSSE format
Test data/report:
−
Load rejection tests
−
Frequency response tests
Control design
−
Control design
−
•
Modified Text
•
Functional description and block diagram
showing transfer function of individual
element of gas turbines units (including effect
of Ambient Temperature). The model is to be
submitted in both PSSE source code (i.e. flecs
code) format and MATLAB Simulink format.
Test data/report:
−
Load rejection tests
−
Frequency response tests
Reasons
To provide clarity on the format of
the information to be provided,
which shall apply to all new or
repowered generating units.
Modification
Ref. No.
Clause
TC/2014/9
C4.1 (j)
Original Text
Modified Text
(j) Power System Stabilizer (PSS)
(j) Power System Stabilizer (PSS)
For each generating unit with Rated MW
Capacity at or above 60MW, a PSS shall be
incorporated to provide additional
damping of power oscillations. Proper
operation of the PSS shall be confirmed by
test. The preferred input signal for the PSS
is accelerating power which can be
synthesized from measured electrical
power and speed. PSS transducers (i.e. for
measuring input signals) shall be linear
over their operational range and its time
constant
shall
not
exceed
100
milliseconds. Power System Operator shall
make available the system characteristic
to Generation Licensees for tuning of PSS.
Generation Licensees shall submit a report
incorporating the methodology in deriving
the setting of the PSS parameters, as well
as the tuning techniques, to PSO for
review before implementation on site.
For each generating unit with Rated MW Capacity at
or above 60MW, a PSS shall be incorporated to
provide additional damping of power oscillations.
Proper operation of the PSS shall be confirmed by test.
The preferred input signal for the PSS shall have dual
inputs, namely is accelerating power which can be
synthesized from measured electrical power and
speed. PSS transducers (i.e. for measuring input
signals) shall be linear over their operational range
and its time constant shall not exceed 100
milliseconds. Power System Operator shall make
available the system characteristic to Generation
Licensees for tuning of PSS. Generation Licensees shall
submit a report incorporating the methodology in
deriving the setting of the PSS parameters, as well as
the tuning techniques, to PSO for review before
implementation on site.
Reasons
To align with the current practice
of using dual-input PSS which
offers
better
transient
performance than single-input PSS.
Modification
Ref. No.
Clause
TC/2014/10
F2.1
Original Text
Modified Text
F2.1 Voltage Fluctuation
F2.1 Voltage Fluctuation
(a) Connected person shall ensure that the
operation of their installations shall not
cause voltage fluctuation at a point of
common coupling to exceed 3% of the
nominal voltage for step changes.
(a) Connected person shall ensure that the operation
of their installations shall not cause voltage fluctuation
at a point of common coupling to exceed 3% of the
nominal voltage for step changes.
(b) The planning limits for voltage
fluctuation caused by connected person,
e.g. owner of an arc furnace, shall be in
accordance with the requirements set out
in Engineering Recommendation P28 of
UK.
(a) Connected person shall ensure that the operation
of their installations shall not cause voltage fluctuation
at a point of common coupling to exceed 3% of the
nominal voltage for step changes, with the exception
of the energisation of transformers and series reactors
connected to the transmission network, which shall
not cause voltage fluctuation at a point of common
coupling to exceed 5% of the nominal voltage.
(b) The Transmission Licensee shall ensure that the
energisation of transformers and series reactors
connected to the transmission network shall not cause
voltage fluctuation at a point of common coupling to
exceed 5% of the nominal voltage. Unless otherwise
agreed with the PSO, the Transmission Licensee shall
provide a report on predicted equipment energisation
performance whenever a new type of power
equipment is introduced or there are changes in the
specifications of existing type of power equipment.
This report shall include electromagnetic transient
studies.
(c) The planning limits for voltage fluctuation caused
by connected person, e.g. owner of an arc furnace,
shall be in accordance with the requirements set out
in Engineering Recommendation P28 of UK.
Reasons
To incorporate the limit for voltage
fluctuations due to energisation of
cables,
transformers
and
shunt/series reactors. The limit is
set with reference to IEC/TR 610003-7:2008.
Modification
Ref. No.
Clause
TC/2014/11
F4.3
TC/2014/12
H2.1(b)
Original Text
Modified Text
Reasons
New
The Generation Licensee, with Generation Registered
Facility at point of connection of 66kV voltage and
above, shall provide compatible voice communication
equipment located in the Generation Licensee's
generation facility control room which shall be
connected to the Transmission Licensee's voice
communication system. The Generation Licensee shall
be responsible for the communication lines from the
Generation Licensee's generation facility control room
to the Transmission Licensee's termination box that
connects to the Transmission Licensee's voice
communication system. The termination box shall be
provided by the Transmission Licensee and shall be
located in the generating station switchhouse. In the
event of relocation of the termination box or diversion
of the communications lines, the Licensee that
initiates the relocation or diversion shall bear all the
costs necessary for the relocation or diversion
including the costs incurred by any other affected
Licensee to divert the communication lines at the
affected Licensee’s end caused by the relocation or
diversion.
To enhance the resilience of the
voice communication system in the
power sector.
An AGC station shall have a dedicated RTU
with the condition that the RTU shall not
be controlling more than 4 generating
units or a total of more than 1000MW.
Should the number of generating units or
total generating capacity exceed this, then
a second RTU shall be provided.
An AGC station A generating station shall have a
dedicated RTU with the condition that the RTU shall
not be controlling more than 4 generating units or a
total of more than 1000MW. Should the number of
generating units or total generating capacity exceed
this, then a second RTU shall be provided.
To align with the definition of
“generating station” in the
Transmission Code.
Modification
Ref. No.
Clause
Original Text
Modified Text
Reasons
TC/2014/13
H3.1
Communications between the remote
terminal equipment and the EMS shall be
through 2-wire telephone line or pilot
wire. The equipment shall communicate
using V.34 analog lease-line modems or
X.27 optical modems. The modems at the
EMS will operate as originator while the
remote terminal equipment modems will
operate as answerer.
Communications between the remote terminal
equipment located at the Transmission Licensee’s
substation and/or the connected person’s intake
substation/switchhouse and the EMS shall be through
2-wire telephone line or pilot wire or optical fibre data
communication lines provided by the Transmission
Licensee and at least one of which shall be a pilot wire
communication
line.
The
equipment
shall
communicate using V.34 analog lease-line modems or
X.27 optical modems. The modems at the EMS will
operate as originator while the remote terminal
equipment modems will operate as answerer.
To enhance the security and
reliability of the communication
system in the electricity network by
using
independent
data
communication lines (which are to
be provided by the Transmission
Licensee) instead of the public
communication network.
TC/2014/14
H3.3
It is the responsibility of the Transmission
Licensee and Generation Licensee to
provide all the equipment at the remote
site including the communication
equipment and the communication line
up to the surge arrestor located at the
PSO control centres.
It is the responsibility of the Transmission Licensee
and Generation Licensee to provide all the equipment
at the remote site including the communication
equipment and the communication line up to the
surge arrestor located at the PSO control centres. The
communication equipment shall include encryption
devices to ensure secure communication on the
communication lines. These encryption devices shall
be of the same make and model as the devices
installed at the PSO control centres.
To align with the current practice
of deploying encryption devices in
communication lines so as to
protect against cyber-security and
ensure power system security.
Modification
Ref. No.
Clause
TC/2014/15
H4.1
Original Text
Substation and Switchhouse
Modified Text
Reasons
The following measurements shall be provided:
(f) Transformer taps (with the exception of 66/22
kV transformers); and
(g) Solar global irradiance (applicable only to
Transmission Licensee) that comply with the
following minimum specifications. Transmission
Licensee shall seek advice from the Power
System Operator on the location of the
transmission substation(s) for installation of
Solar global irradiance measurement.
To facilitate the collation and
monitoring of solar photovoltaic
weather data for the planning and
enhancement (if required) of the
electricity network to ensure the
grid readiness to support greater
deployment of solar photovoltaic
systems.
-2
• Irradiance range: 0 – 2000Wm or better
• Accuracy of direct output: >90% for clear sky
• Directional response (for beam irradiance): +/20Wm2
• Response time to reach 95% response: < 30
seconds; and
(h) Other quantities, as required.
TC/2014/16
H4.2
AGC Station
AGC Station Generating station
Consequential change to align with
the proposed change in Appendix
H2.1 (b) above.
Modification
Ref. No.
Clause
Original Text
Modified Text
Reasons
TC/2014/17
H4.2 (d)
The status of the following equipment
shall be provided:
The status of the following equipment shall be
provided:
New
(d) Status of frequency response switch
To align with the current practice
of monitoring the status of
frequency response switch.
TC/2014/18
H4.2 (e)
Renumber
from existing
H4.2 (d)
TC/2014/19
H4.2 (f)
Renumber
from existing
H4.2 (e)
TC/2014/20
H4.2 (g)
H4.2 (d)
H4.2 (d) (e)
Emergency Shutdown Valve (ESDV) and
the status of all valves on the Onshore
Receiving Facility (ORF) and natural gas
transmission pipeline supplying natural
gas to the generation facility.
Emergency Shutdown Valve (ESDV) and the status of
all valves on the Onshore Receiving Facility (ORF) and
natural gas transmission pipeline supplying natural gas
to the generation facility.
H4.2 (e)
H4.2 (e) (f)
Pressure and gas flow at ORF and natural
gas transmission pipeline supplying
natural gas to the generation facility.
Pressure and gas flow at ORF and natural gas
transmission pipeline supplying natural gas to the
generation facility.
New
H4.2 (g)
For a combined-cycle plant or gas turbine, the ambient
temperature and the hot switch activation signal when
fuel changeover is initiated, manually or automatically,
from natural gas to its alternate fuel and the fuel type
used.
Consequential change due to the
proposed change to Appendix H4.2
(d) above.
Consequential change due to the
proposed change to Appendix H4.2
(d) above.
To align with the current practice
of monitoring the ambient
temperature
and
hotswitch
activation signal for all combinedcycle plants and gas turbines.
Modification
Ref. No.
TC/2014/21
Clause
H4.2 (h)
Renumber
from existing
H4.2 (f)
Original Text
Modified Text
H4.2 (f)
H4.2(f) (h)
Other quantities, as required.
Other quantities, as required
Reasons
Consequential change due to the
proposed change to Appendix H4.2
(d) above.
TC/2014/22
H6 (i)
New
Status and measurements sent to the EMS shall be
flagged as “not topical” by the RTU whenever there is
a failure in the instrument or system providing the
status or measurements to the RTU.
To align with the current practice
of
flagging
status
and
measurements as “not topical”
when there is a failure in the
instrument or system providing the
status or measurements to the
RTU.
TC/2014/23
H8 (d)
Compliance table with the IEC 870-5-101
Interoperability List (Appendix H10)
Compliance table with the IEC 870-5-101
Interoperability List (Appendix H10) as stated in the
System Operation Manual.
Detailed
information
on
interoperability is described in the
System Operation Manual.
TC/2014/24
H8 (e)
IEC 870-5-101 Protocol Information Object
Address Assignments (Appendix H11)
IEC 870-5-101 Protocol Information Object Address
Assignments (Appendix H11) as stated in the System
Operation Manual.
Detailed information on protocol
information
object
address
assignments is described in the
System Operation Manual.
Modification
Ref. No.
Clause
TC/2014/25
H10
IEC 870-5-101 Interoperability List
IEC 870-5-101 Interoperability List
Appendix H10 is no longer needed
as
detailed
information
on
interoperability is described in the
System Operation Manual.
TC/2014/26
H11
IEC 870-5-101 Protocol Information Object
Address Assignments
IEC 870-5-101 Protocol Information Object Address
Assignments
Appendix H11 is no longer needed
as information on protocol
information
object
address
assignments is described in the
System Operation Manual.
TC/2014/27
Appendix I2
See details in Table below
See details in Table below
To update
switchgears,
cables.
Original Text
Modified Text
Reasons
the standards for
transformers
and
Updates to Switchgear, Transformers and Cable Standards
Clause
Items
Original Standard
Switchgear
IEC 60298
IEC 60694
Circuit Breakers
IEC 62271-100
BS 5311
Updated Standard
IEC 60298 IEC 62271-200
IEC 60694 IEC 62271-1
IEC 62271-100
BS 5311 BS EN 62271-100
IEC 62271-102
BS 5253
IEC 62271-102
BS 5253 BS EN 62271-102
Current Transformers
IEC 60044
BS 7626
BS 3938
SS318
IEC 60044 IEC 61869
BS 7626 BS EN 61869
BS 3938
SS318
Voltage Transformers
IEC 60186
IEC 60044
BS 7625
BS 3941
IEC 60186 IEC 61869
IEC 60044
BS 7625 BS EN 61869
BS 3941
IEC 60044-6
IEC 60044-6 IEC 61869-1
IEC 61869-2
IEC 60137
BS 223
IEC 60137
BS 223 BS EN 60137
AC Disconnectors
(Isolators)
Appendix I2.1:
Switchgear
Instrument
Transformers
Bushings
Relays
IEC 60255
BS 5992
IEC 60255
BS 5992
BS EN 61810-1
BS EN 61810-2
Clause
Items
Original Standard
Updated Standard
Instruments
BS 89
BS 89
BS EN 60051-1
Earthing
IEC 62271-102
CP 1013
SS CP 16
IEC 62271-102
CP 1013 BS 7430
SS CP 16 SS 551
Motors
BS 2613
BS 5000 Part II
BS 3979
BS 2613
BS 5000 Part II BS EN 60034
BS 3979 BS 60079-1
Control Gear
IEC 60694
IEC 60298
BS 5424 Part I
IEC 60694 IEC 62271-1
IEC 60298 IEC 62271-200
BS 5424 Part I BS EN 60947-4-1
IEC 60332 Part I
BS 6231
IEC 60332 Part 1 IEC 60332-1-1
IEC 60332-1-2
BS 6231
Inductive Load Switching
IEC 61233
IEC 61233 IEC 62271-110
Sulphur Hexafluoride
(SF6)
IEC 60376
BS 5207
BS 5209
IEC 60376
BS 5207 BS EN 60376
BS 5209 BS EN 60480
High Voltage Test
Techniques
IEC 60517
BS 923
IEC 60517 IEC 62271-203
BS 923 BS EN 60060-1
Cable Connections
IEC 60859
IEC 60859 IEC 62271-209
Wires and Wiring
Clause
Appendix I2.2:
Transformers
Items
Original Standard
Updated Standard
Enclosures
IEC 60517
IEC 60529
CENELEC EN50 052
CENELEC EN50 064
CENELEC EN50 068
CENELEC EN50 069
IEC 60517 IEC 62271-203
IEC 60529
CENELEC EN50 052
CENELEC EN50 064
CENELEC EN50 068
CENELEC EN50 069
Sound Level Meter
IEC 60651
IEC 60651 IEC 61672
Transformers
IEC 60076
IEC 60722
IEC 60354
SS 404
IEC 60076
IEC 60722
IEC 60354
SS 404
Power Transformers
IEC 60076
BS 171
IEC 60076
BS 171
Transformer Oil
BS 148
BS 5730
BS 148
BS EN 60296
BS 5730 BS EN 60422
Tap Changers
BS 4571
BS 4571 BS EN 60214-1
High Voltage Test
Technique
Precision Sound Level
Meters
IEC 60060
BS 923
IEC 60060
BS 923 BS EN 60060-1
IEC 60651
IEC 60651 IEC 61672
Earthing
SS CP16
SS CP16 SS 551
Motor
BS 2613
BS 2613 BS EN 60034
High Voltage Bushings
BS 223
BS 223 BS EN 60137
Clause
Appendix I2.3:
Cables
Items
Original Standard
Updated Standard
Current Transformers
BS 7626
BS 3938
SS 318
BS 7626
BS 3938 BS EN 61869
SS 318 IEC 61869
XLPE insulation power
cables for rated voltages
of up to 600/1000V
SS 324
SS 324 SS 443
IEC 60502-1
Tests for power cables
with extruded insulation
IEC 60840
IEC 60502
IEC 60840
IEC 60502
IEC 62067
Cable Connections
IEC 60859
IEC 60859 IEC 62271-209
Appendix 2
EMA’s Response to Public/Industry Feedback EMA’s Response to Public/Industry Feedback
Modification
Ref. No.
Clause
Public/Industry
Comments
EMA’s Response
TC/2014/3
6.12.3
MSD International GmbH
(Singapore Branch)
30s real time reporting to PSO, Tuas Power to
confirm?
There is no requirement for 30 sec real-time reporting to the
Power System Operator’s (PSO) Energy Management System
(EMS) under clause 6.12.3 of the Transmission Code. Clause
6.12.3 is only applicable to Generation Licensees and the
Transmission Licensee. Real-Time monitoring requirements for
Intermittent Generation Sources are specified in System
Operation Manual. An extract of the requirements is appended
below:-
Real-Time Monitoring System Overview
The Market Participants shall make provision to provide to PSO
the following signals with a sampling rate of 1 minute:
i) For each Intermittent Generation Facility,
Active power ;and
Other measurements or status as required by PSO.
The above information shall be submitted to the PSO in realtime every 1 minute. The information shall be organised in an
ASCII Monitoring Data File (MDF) and submitted over the
Internet using the secured FTP protocol.
Modification
Ref. No.
Clause
Public/Industry
Singapore Power Limited
Comments
EMA’s Response
We propose that the clause be amended as
shown below (in red) to provide clarity on the
Transmission Licensee responsibility:
EMA disagrees with SPPG's proposed changes to clause 6.12.3.
The Transmission Licensee and Generation
Licensee shall provide all the equipment at their
respective site, including the communication
equipment. The Transmission Licensee shall
provide data communication lines from the
communication room of Transmission Licensee
the computer room in / near the control centers
of the Power System Operator to the
transmission substation and power station
generating station switchhouses as specified by
the Power System Operator for the purposes of
real-time power system monitoring and control.
We propose that the clause be amended as
shown below (in red) to ensure that parties only
pay for the costs for the portion that they are
responsible for:
The Generation Licensee shall be responsible for
the data communication lines from the
Generation Licensee’s equipment to a
termination box located in the generating
station’s switchhouse. The termination box,
which shall be provided by the Transmission
Licensee, shall also be used for termination of
the Transmission Licensee’s data communication
The Transmission Licensee shall provide data communication
lines from the PSO’s computer room to the transmission
substations and generating station switchhouses, and this
includes the portion from the PSO’s computer room and the
Transmission Licensee’s communication room. This is aligned
with the current arrangement. An example is the data
communication lines at Labrador Backup Control Centre (BCC)
which is owned by the Transmission Licensee.
It is inequitable for a party to bear the relocation or diversion
costs, even for the portion that he is responsible for, if the
relocation of the termination box or diversion of the data
communication lines is not initiated by him. The party that
initiates the relocation or diversion shall instead bear all the
necessary costs. This is based on a causer-pay principle.
Modification
Ref. No.
Clause
Public/Industry
Comments
EMA’s Response
lines. In the event of relocation of the
termination box or diversion of the data
communications lines, the Licensee that initiates
the relocation or diversion shall bear its own all
the costs necessary for the relocation or
diversion while including the costs incurred by
any other affected Licensee shall bear its own
costs to divert the data communication lines at
the affected Licensee’s end caused by the
relocation or diversion. All the equipment at the
site shall be equipped with battery backup of at
least 4-hour operation time. In addition, the AC
power shall also be backed up by the standby
generator at the site, if the site is equipped with
such a facility.
TC/2014/4
6.12.7
(new)
SolarGy Pte Ltd
Please see attached typical schematic at an elect
distribution network for a building with 22kV
intake.
For clarity, please confirm where should be the
solar power meters. Is it at (A) and (C) or (A) and
(D)?
Based on the schematic submitted, (A) shall be the monitoring
point. However, as the setup for each installation varies, a solar
PV connection applicant can submit its proposal to the PSO for
discussion prior to implementation.
Modification
Ref. No.
Clause
Public/Industry
Comments
EMA’s Response
Tuas Power Generation
Pte Ltd
The provision of the required signals at 1 minute
interval to the Power System Operator should
not apply to owners (e.g. Generation Licensee)
who install the solar photovoltaic for its own
internal use and it is not connected to the grid
for export.
The requirement shall apply to solar PVs that are connected to
the grid regardless whether the electricity generated from the
solar PVs is for internal consumption or export to the grid. This
is to facilitate the monitoring of power output from solar
photovoltaic installations with an installed capacity of 100kWac
or above, and ensure that there is sufficient reserve capacity
available in the system to respond to sudden fluctuations in
solar PV output, so as to maintain power system security and
reliability.
For clarity, EMA has revised the clause as follows:
“Owners of solar photovoltaic installations with an installed
capacity of 100 kWac or above at each site/facility which is
connected to the grid, shall provide the Power System
Operator with the following signals which is sampled and
transmitted at 1 minute intervals. Detailed requirement shall
be provided by the Power System Operator upon request.”
Modification
Ref. No.
Clause
Public/Industry
Phoenix Solar Pte Ltd
Comments
EMA’s Response
With reference to TC/2014/4, proposed new
clause 6.12.7 on PSO metering for PV systems
with capacities of 100kWac or above, please see
our attached feedback.
With the increasing connection of solar PV systems to the
electricity grid in Singapore, the PSO will need to manage the
intermittent nature of such sources to ensure that the security
and reliability of the power system is not compromised. The
monitoring of the power output from solar PV systems is
necessary to ensure that there is sufficient reserve capacity in
the grid to respond to sudden fluctuations in solar PV output.
The feedback covers not only PSO metering but
also revenue metering requirements for PV
systems with wholesale generation licences and
smaller systems belonging to contestable
consumers who wish to sell excess PV
production. The two metering topics are closely
related
and
share
the
problem
of
disproportionate cost.
I am attaching our feedback both as pdf for
record keeping and as word document to simplify
copying text into other documents.
Singapore Power Limited
For completeness, EMA may wish to include the
provision of communication media for
transmitting the metering data to the Power
System Operator under the scope of the owner.
Nevertheless, EMA has reviewed the industry feedback, and
reduced the monitoring requirement to only the active power
(gross) at the AC-side of the solar photovoltaic installation.
Additionally, the monitoring timeframe shall be shortened to
6am to 8pm daily.
On the metering requirements, EMA is reviewing it separately
as part of a wider review on the new pricing mechanism for
intermittent generation sources.
Solar PV owner can transmit the metering data via secure ftp
internet. The details are specified in the System Operation
Manual.
Modification
Ref. No.
Clause
Public/Industry
Senoko Energy
Comments
EMA’s Response
We would like to clarify whether the signals to
PSO are required for Solar installations that offset internal consumption from a load facility (i.e.,
the Solar installations are not connected to the
grid).
The requirement shall apply to solar PVs that are connected to
the grid regardless whether the electricity generated from the
solar PVs is for internal consumption or for export to the grid.
For clarity, EMA has revised the clause as follows:
“Owners of solar photovoltaic installations with an installed
capacity of 100 kWac or above at each site/facility which is
connected to the grid, shall provide the Power System
Operator with the following signals which are sampled and
transmitted at 1 minute intervals. Detailed requirement shall
be provided by the Power System Operator upon request.”
Modification
Ref. No.
Clause
TC/2014/6
9.4
Public/Industry
Tuas Power Generation
Pte Ltd
Comments
EMA’s Response
Transmission Licensee shall be responsible to
implement 9.4.1 (a) for cables belonging to
Transmission Licensee laid in the Generation
Licensee premises.
Earthworks carried out in the generating station premises are
under the control of the Generation Licensees. As such, it is the
responsibility of the Generation Licensees to implement
measures including establishing a standard operating
procedure and Permit-to-Work system to ensure that the
Transmission Licensees’ cables in the Generation Licensee’s
premises are protected from damage by any earthworks
carried out in the premises. This is to ensure power system
security and reliability.
The Transmission Licensee shall follow the ‘SOP’
for earthwork and the ‘PTW’ system
implemented in the Generation Licensee
premises.
The Transmission Licensees shall also keep up-todate digital mapping or records of their high
voltage cables installed in the Generation
Licensee premises.
YTL PowerSeraya Pte.
Limited
Section 9.4.1(c) should not be applicable to
Transmission Licensee's contractors working
inside the Generation Licensee's premises as the
PTW for the work should be issued by the
Transmission Licensee after consent is given by
the Generation Licensee.
Earthworks carried out in the generating station premises are
under the control of the Generation Licensees. As such, it is the
responsibility of the Generation Licensees to implement
measures including establishing a standard operating
procedure and Permit-to-Work system to ensure that the
Transmission Licensees’ cables in the Generation Licensee’s
premises are protected from damage by any earthworks
carried out in the premises. This is to ensure power system
security and reliability.
Modification
Ref. No.
TC/2014/7
Clause
C1.3 (d)
Public/Industry
Comments
EMA’s Response
Senoko Energy
We propose that it should be the TL’s
responsibility to protect its own asset. From the
design stage when TL intends to lay its electricity
cables in the generating station premises, TL
must in consultation with GL provide clear
markings and adequate protection of 400kV,
230kV and 66kV cables routes within the
generating station premises at their own cost.
Earthworks carried out in the generating station premises are
under the control of the Generation Licensees. As such, it is the
responsibility of the Generation Licensees to implement
measures including establishing a standard operating
procedure and Permit-to-Work system to ensure that the
Transmission Licensees’ cables in the Generation Licensee’s
premises are protected from damage by any earthworks
carried out in the premises. This is to ensure power system
security and reliability.
YTL PowerSeraya Pte.
Limited
“Report on predicted transformer energisation
performance including electromagnetic transient
studies and detailed model in PSCAD" should be
applicable to new planting only
The requirement is applicable to new generating unit step-up
transformers as well as modification to existing generating unit
step-up transformers.
Modification
Ref. No.
Clause
Public/Industry
Comments
EMA’s Response
Keppel Infrastructure
Holdings Pte Ltd
What is PSCAD?
PSCAD is an engineering simulation software tool for
performing and analysing switching transient studies.
ExxonMobil Asia Pacific
Pte Ltd
We would like to seek clarification on the
following :
(a) PSCAD is an engineering simulation software tool for
performing and analysing switching transient studies and it is
also widely used in the industry. However, we noted the
comments and have amended the Code accordingly as follows:
(a) Whether there are any other software that
can be used besides PSCAD
(c) Whether this is applied to all step up
transformer regardless of size
“Report on predicted transformer energisation performance
including electromagnetic transient studies unless otherwise
agreed with the PSO.”
(c) The step-up transformer data listed in Section C1.3 (d) is
required for all generating units.
TC/2014/8
C1.3 (h)
ExxonMobil Asia Pacific
Pte Ltd
ExxonMobil would like to understand the reasons
for the said reporting to be provided in both
formats. If there are no limitations to providing
the information in the PSSE format, we
recommend that the MATLAB Simulink format be
as an alternative option, rather than an
additional requirement. I.e., the amended text
would read “……The model is to be submitted in
either both PSSE source code (i.e. flecs code)
format or and MATLAB Simulink format.”
The PSSE model is for integrated power system studies while
the MATLAB Simulink model serves the purpose of assessing
individual generating unit performance.
Modification
Ref. No.
Clause
TC/2014/9
C4.1 (j)
TC/2014/10
F2.1
Public/Industry
Comments
EMA’s Response
Pte.
This clause should not be applicable to existing
generating units.
The requirement is applicable to new power system stabilizers
and modification to existing power system stabilizers.
Quality
Power
Management Pte Ltd
For clarity and completeness of the Code, the
limits should be specified clearly, and not be
referenced to another standard like the U.K ER
P28. Furthermore the ER P28 is undergoing
review at the moment, so limits stated in the
existing (1989) version could very well be
changed after review, causing further confusion,
as to what the limits should be. Since a
modification of this statement is due, it will be
good to make this clear; with limits specified.
EMA’s proposed amendment is for clause F2.1 (a) and not F2.1
(b). Nevertheless, we note your comments to clause F2.1 (b).
EMA has assessed that it would be prudent to make reference
to Engineering Recommendation P28 of UK as opposed to
specifying the limits in clause F2.1 (b), so as to cover any
changes and updates to the Engineering Recommendation P28
of UK.
YTL PowerSeraya
Limited
Modification
Ref. No.
Clause
Public/Industry
Singapore Power Limited
Comments
Clause F2.1 states the voltage fluctuation
requirement during daily operation.
We are of the view that less frequent events i.e.
the energisation of cables, transformers and
shunt/series reactors connected to the
transmission network under IEC/TR 61000- 37:2008 need not be included.
EMA’s Response
Clause F2.1 is not restricted to daily switching operations.
The energisation of cables, transformers and shunt/series
reactors do affect Singapore transmission system. The upper
limit of the 3-5% requirement in IEC/TR 61000-3-7:2008, i.e.
5%, is adopted for such non-frequent switching events.
To amend the following for alignment with requirements to :
“(b) The Transmission Licensee shall ensure that the
energisation of transformers and series reactors connected to
the transmission network shall not cause voltage fluctuation at
a point of common coupling to exceed 5% of the nominal
voltage. Unless otherwise agreed with the PSO, the
Transmission Licensee shall provide a report on predicted
equipment energisation performance whenever a new type of
power equipment is introduced or there are changes in the
specifications of existing type of power equipment. This report
shall include electromagnetic transient studies.”
Modification
Ref. No.
Clause
Public/Industry
Comments
EMA’s Response
ExxonMobil Asia Pacific
Pte Ltd
We would like to seek clarification on the
following :
The voltage fluctuation shall not exceed 5% of the nominal
voltage at the point of common coupling, as specified in the
proposed modification to Section F2.1 (a) (TC/2014/10).
(b) The allowable transient voltage drop (%) at
PCC.
TC/2014/11
F4.3
Tuas Power Generation
Pte Ltd
At present, there are five (5) communication
means between PSO control centres and
Generation Licensees to ensure effective
communication.
1. Grid –Com Radio Set
2. Hot line to Power System Control Centre of
EMA
The Transmission Licensee's VoIP is a separate communication
infrastructure, owned and operated by the Transmission
Licensee within the power sector. A single point of failure
could occur if the power sector relies solely on public telco’s
communication infrastructure. As such, extending the existing
VoIP to the Generation Licensees will enhance the resiliency of
the communication infrastructure in the power sector.
3. Hot line to Backup Control Centre of EMA
4. Normal telephone line
For clarity, EMA has revised the clause as follows:
5. Fax machine through Singtel line
Our view is that the above five communication
means are adequate and have worked well over
the past years, and the new communication
requirement is unnecessary.
The new
requirement would entail additional costs for the
Generation Licensee.
In addition, we are of the view that the
Generation Licensee’s voice communication
equipment connected to the Transmission
Licensee’s
voice
communication
system
termination box could also be located in the
“The Generation Licensee, with Generation Registered Facility
at point of connection of 66kV voltage and above, shall provide
compatible voice communication equipment located in the
Generation Licensee's generation facility control room which
shall be connected to the Transmission Licensee's voice
communication system. The Generation Licensee shall be
responsible for the communication lines from the Generation
Licensee's generation facility control room to the Transmission
Licensee’s termination box that connects to the Transmission
Licensee's voice communication system. The termination box
shall be provided by the Transmission Licensee and shall be
located in the generating station switchhouse. In the event of
Modification
Ref. No.
Clause
Public/Industry
Comments
EMA’s Response
Generation Licensee’s room in the switchhouse
where equipment control facility is provided.
relocation of the termination box or diversion of the
communications lines, the Licensee that initiates the relocation
or diversion shall bear all the costs necessary for the relocation
or diversion including the costs incurred by any other affected
Licensee to divert the communication lines at the affected
Licensee’s end caused by the relocation or diversion.”
Singapore Power Limited
To enhance the resilience of the voice
communication system in the power sector, the
Generation Licensee should be linked directly to
the Power System Operator and not via the
Transmission Licensee's voice communication
system.
The Transmission Licensee's VoIP is a separate communication
infrastructure, owned and operated by the Transmission
Licensee within the power sector. A single point of failure
could occur if the power sector relies solely on public telco’s
communication infrastructure. As such, extending the existing
VoIP to the Generation Licensees will enhance the resiliency of
the communication infrastructure in the power sector.
Keppel
Infrastructure
Holdings Pte Ltd
Please provide more details on “compatible voice
communication equipment”.
“Compatible voice communication equipment” means any
voice communication equipment that is compatible to work
with SPPG’s VoIP system.
ExxonMobil Asia Pacific
Pte Ltd
ExxonMobil would like to understand the reasons
for 2 separate lines of voice communication with
PSO and Transmission Licensee. We would like to
seek clarification on the following :
a) This is to enhance the resilience for voice communication
especially during power system emergency. One line of voice
communication is via hotline using public telco lines while the
other uses VOIP via private communication system provided by
Modification
Ref. No.
Clause
Public/Industry
Comments
(a) Difference in the nature and content of
communication coming through the 2 separate
lines from PSO and Transmission Licensee
EMA’s Response
Transmission Licensee. These lines are to link between
Generation Licensees and PSO, not with the Transmission
Licensee.
(b) Whether all the Generation Licensees or only
Generation Licensees on specific distribution
networks (66kV vs 22kV...) will be affected by this
proposed requirement
b) This requirement shall apply to Generation Licensees’ with
Generation Registered Facility at point of connection of 66kV
voltage and above.
(c) Whether the proposed requirement will
create a potential for conflicting instruction or
information to come through the 2 separate lines
that will impact the timeliness of response from
the Generation Licensees in an emergency
situation.
For clarity, EMA has revised the clause as follows:
“The Generation Licensee, with Generation Registered Facility
at point of connection of 66kV voltage and above, shall provide
compatible voice communication equipment located in the
Generation Licensee's generation facility control room which
shall be connected to the Transmission Licensee's voice
communication system. The Generation Licensee shall be
responsible for the communication lines from the Generation
Licensee's generation facility control room to the Transmission
Licensee's termination box that connects to the Transmission
Licensee's voice communication system. The termination box
shall be provided by the Transmission Licensee and shall be
located in the generating station switchhouse. In the event of
relocation of the termination box or diversion of the
communications lines, the Licensee that initiates the relocation
or diversion shall bear all the costs necessary for the relocation
or diversion including the costs incurred by any other affected
Licensee to divert the communication lines at the affected
Licensee’s end caused by the relocation or diversion.”
Modification
Ref. No.
TC/2014/13
Clause
H3.1
Public/Industry
Singapore Power Limited
Comments
We propose that the clause be amended (in red):
Communications between the remote terminal
equipment located at the Transmission
Licensee’s substation and/or the termination box
of connected person’s intake substation /
switchhouse and the EMS shall be through 2-wire
telephone line or pilot wire or optical fibre data
communication
lines
provided
by the
Transmission Licensee. The equipment shall
communicate using V.34 analog lease-line
modems or X.27 optical modems. The modems
at the EMS will operate as originator while the
remote terminal equipment modems will
operate as answerer.
EMA’s Response
(c) The communication is between the Generation Licensees
and PSO and not the Transmission Licensee. As such, there will
not be conflicting instruction.
EMA agrees that the communication should be through pilot
wire or optical fibre data communication lines. However, one
of them should at least be a pilot wire communication line. This
is to ensure high availability of communication at all times,
given that pilot wires do not rely on public telcos’
communication infrastructures unlike optical fibre data
communication lines.
For clarity, EMA is amending the clause as follows:
“Communications between the remote terminal equipment
located at the Transmission Licensee’s substation and/or the
connected person’s intake substation/switchhouse and the
EMS shall be through 2-wire telephone line or pilot wire or
optical fibre communication lines provided by the Transmission
Licensee and at least one of which shall be a pilot wire
communication line. The equipment shall communicate using
V.34 analog lease-line modems or X.27 optical modems. The
modems at the EMS will operate as originator while the remote
terminal equipment modems will operate as answerer.
Modification
Ref. No.
Clause
TC/2014/15
H4.1
Public/Industry
SolarGy Pte Ltd
Comments
Is there any specification governing the accuracy
of the irradiation meter to be provided? 2nd
class, 1st class or secondary standard to ISO
9060:1990?
EMA’s Response
The irradiation meter specifications are as follows.
• Irradiance range: 0 – 2000Wm-2 or better
• Accuracy of direct output: >90% for clear sky
2
• Directional response (for beam irradiance): +/- 20Wm
• Response time to reach 95% response: < 30 seconds
Tuas Power Generation
Pte Ltd
Clause H4.1(h) shall be deleted as it is not clear
on what other quantities refer to.
Any
amendment shall be through consultation paper
for proposed modification.
Clause H4.1(h) is an existing clause that covers any other
peculiar measurements which are not encompassed in the
above listed bullets, yet essential to be monitored for the
reliability and security of the power system as it evolves.
Singapore Power Limited
We noted that the EMA has proposed that
Transmission Licensee shall provide solar global
irradiance measurement at all transmission
substation.
As part of SPPG’s long term network planning process to
include solar PV projections so as to ensure that the grid is
ready to support greater deployment of solar PV systems, SPPG
should monitor solar irradiance to project the potential solar
PV that are located in regions island wide.
We are of the opinion that it seems
inappropriate for the Transmission Licensee to
provide the weather data for the following
reasons :1. Provision of weather data is beyond the scope
of transmission services ;
NEA solar irradiation data only covers 5 sites in Singapore.
Given the widespread locations of Transmission Licensee’s
transmission substations, obtaining weather data from these
substations would ensure sufficient coverage of irradiation
geographically.
2. There is no correlation in the deployments of
transmission substations and solar photovoltaic
Solar global irradiance measurements need not be provided for
Modification
Ref. No.
Clause
Public/Industry
Comments
EMA’s Response
systems i.e. information collated might not be
very useful;
all the transmission substations. PSO will discuss with SPPG to
identify the substations where irradiation meters should be
installed to ensure sufficient coverage of irradiation data
geographically.
3. NEA (the Government agency responsible for
providing weather information services) is
monitoring the solar radiation data at various
locations. To avoid duplicate of data, we believe
it would be more cost effective and efficient for
NEA to share the information with EMA instead
of EMA trying to gather the data through its
Licensee.
We would be happy to discuss with EMA further
to understand the rationale for this new
requirement imposed on a Transmission
Licensee.
For clarity, as well as, to include the specifications of the
irradiation meter, EMA has revised the clause as follows:
"(g) Solar global irradiance (applicable only to Transmission
Licensee’s substations); and that comply with the following
minimum specifications. Transmission Licensee shall seek
advice from the Power System Operator on the location of the
transmission substation(s) for installation of solar global
irradiance measurement.
• Irradiance range: 0 – 2000Wm-2 or better
• Accuracy of direct output: >90% for clear sky
2
• Directional response (for beam irradiance): +/- 20Wm
• Response time to reach 95% response: < 30 seconds; and"
TC/2014/17
H4.2 (d)
YTL PowerSeraya
Limited
Pte.
This clause should not be applicable to existing
steam generating units.
The requirement is applicable to new steam generating units as
well as modification to existing steam generating units.
Modification
Ref. No.
Clause
TC/2014/20
H4.2 (g)
TC/2014/22
H6 (i)
TC/2014/27
Appendix
I2
Public/Industry
Senoko Energy
YTL PowerSeraya
Limited
WorleyParsons Pte Ltd
Pte.
Comments
EMA’s Response
The provision of an ambient temperature signal
for the CCP to PSCC is likely to will involve costs.
Singapore is a small country and ambient
temperatures generally do not have a large
deviation between PSCC and generating stations.
It may be more economical for PSCC to take
reading of ambient temperature as it is there.
Ambient temperature varies especially in coastal areas where
power stations are usually located. It is therefore not accurate
to take the ambient temperature measurement at PSCC.
Moreover, ambient temperature is one of the parameters used
in CCP’s controller and is therefore readily available for sharing
with PSO.
It should apply only to RTU of the new plant.
The requirement is applicable to new RTU as well as
modification to existing RTU.
I2.1:Switchgear (Motors)
I2.1:Switchgear (Motors)
BS 3979 was superseded by BS 4999 and BS 5000
in 1981.
BS EN 60034 is the BS adoption of IEC 60034, and they are
identical in content.
Why specify BS EN 60034 for motors when the
internationally accepted code is IEC?
BS 3979:1966 standard was superseded by BS EN 600791:2014.
I2.2:Transformers (Transformer Oil)
I2.2:Transformers (Transformer Oil)
The updated BS 148:2009 (R2004) is dedicated to
reclaimed mineral insulating oil only and does
not cover unused oil.
The specification for unused mineral insulating
oil is now covered in BS EN 60296, which is
identical to IEC 60296:2012.
BS 148:1998 covered the specification for unused and
reclaimed mineral insulating oil for transformers and
switchgear.
The specification for unused mineral insulating oil is now
covered in BS EN 60296. BS 148 is now dedicated to reclaimed
mineral insulating oil only.
Modification
Ref. No.
Clause
Public/Industry
YTL PowerSeraya
Limited
Comments
Pte.
It should not be applicable to
switchgears, transformers and cables
EMA’s Response
existing
The requirement is applicable to new switchgear, transformers
and cables as well as modification to existing switchgear,
transformers and cables.