NZQA registered unit standard
20095 version 3
Page 1 of 4
Title
Respond to substation secondary systems alarms and indications in
the electricity supply industry
Level
4
Credits
4
Purpose
People credited with this unit standard are able to: demonstrate
knowledge of control systems associated with a electricity
supply substation; describe the functions and components of
electricity substation secondary systems; interpret and respond
to the operation of substation secondary systems indications
and alarms; record and communicate indications and alarms
from onsite equipment; and report alarm and response actions.
Classification
Electricity Supply > Electricity Supply - Core Skills
Available grade
Achieved
Explanatory notes
1
This unit standard is intended for, but not restricted to, workplace assessment.
2
Safety of personnel and plant must be a priority throughout the assessment.
3
Performance and work practices in relation to the outcomes and evidence
requirements must comply with all current legislation, especially the Electricity Act
1992, and any regulations and codes of practice recognised under that statute; the
Health and Safety in Employment Act 1992; and the Resource Management Act
1991. Electricity supply industry codes of practice and documented industry
procedures include the Safety Manual – Electricity Industry (SM-EI) (Wellington:
Electricity Engineers’ Association, 2010). A full list of current legislation and industry
codes is available from the Electricity Supply Industry Training Organisation, PO Box
1245, Hamilton 3240.
4
The phrase in accordance with industry requirements is implicit in all outcomes and
evidence requirements in this unit standard.
5
Industry requirements include all asset owner requirements; manufacturers’
specifications; and enterprise requirements which cover the documented workplace
policies, procedures, specifications, business, and quality management requirements
relevant to the workplace in which assessment is carried out.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of control systems associated with a electricity supply substation.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
20095 version 3
Page 2 of 4
Evidence requirements
1.1
Substation secondary systems are described.
Range
1.2
includes but is not limited to – DC system, AC system, supervisory
control and data acquisition (SCADA), revenue metering,
transformer protection, distance protection, bus bar protection,
feeder protection, communication system, security system, fire
alarm, station control computer, station alarm panel, compressed
air system, intertrip systems, water cooling systems.
Control systems components are described.
Range
includes but is not limited to – battery charger, battery banks,
remote terminal unit, electronic protection relays, mechanical
protection relays, AC distribution panel, DC distribution panel,
digital microwave radio.
Outcome 2
Describe the functions and components of electricity substation secondary systems.
Evidence requirements
2.1
The functions and components of electricity substation secondary systems are
described.
Range
2.2
includes but is not limited to – DC system, AC system, SCADA
system, revenue metering, transformer protection, distance
protection, bus bar protection, feeder protection, station alarms.
The functions and components of electricity substation protection systems are
described.
Range
includes but is not limited to – transformer, distance, bus bar,
feeder, station alarm protection systems.
Outcome 3
Interpret and respond to the operation of substation secondary systems indications and
alarms.
Range
includes but is not limited to – reason for alarm or indication, provide response.
Evidence requirements
3.1
Transformer protection indications are interpreted and responded to in terms of
differential protection, over current protection, earth fault protection, residual
voltage, buchholz, tap-change, temperature relay, and winding temperature
relay.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
20095 version 3
Page 3 of 4
3.2
Distance protection indications are interpreted and responded to in terms of
differential protection, over current protection, earth fault protection, zone 1,
zone 2, and zone 3.
3.3
Bus bar protection indications are interpreted and responded to in terms of
differential protection, over current protection, earth fault protection, and circuit
breaker fail.
3.4
Feeder protection indications are interpreted and responded to in terms of over
current protection and earth fault protection.
3.5
Indications are responded to in terms of acknowledgement and resetting.
3.6
Station alarm indications are interpreted and responded to.
Range
trip circuit defective, circuit breaker warning, circuit breaker
defective, circuit breaker operation, protection number 1 defective,
signal fail, blocking signal fail, auto reclose operated, circuit
protection operated, buchholz (gas), tap changer fault,
temperature alarm, earthing resistor temperature, bus bar
protection defective, bus bar protection operated, CB fail
protection operated, under/over voltage, disturbance recorder,
compressor fail, battery charger fail, 110 kV DC earth fault, fire
and smoke protection, intruder, metering, communications urgent/
non urgent, vibration.
Outcome 4
Record and communicate indications and alarms from onsite equipment.
Evidence requirements
4.1
Indication sheet recording relay operation is completed.
4.2
Indication and interpretations are communicated.
Outcome 5
Report alarm and response actions.
Range
includes but is not limited to – operating log, service report, flagging sheets,
quality records.
Evidence requirements
5.1
Recorded information is complete, concise, and legible.
5.2
Information is recorded in the required format and filed in the correct location.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
Planned review date
20095 version 3
Page 4 of 4
31 December 2015
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
22 October 2003
December 2012
Rollover and
Revision
2
20 June 2008
December 2012
Review
3
21 July 2011
N/A
Consent and Moderation Requirements (CMR) reference
0120
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMRs). The
CMR also includes useful information about special requirements for organisations wishing
to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
Comments on this unit standard
Please contact the Electricity Supply Industry Training Organisation info@esito.org.nz if
you wish to suggest changes to the content of this unit standard.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016