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Demonstrate knowledge of HVDC in the role of a power system
controller
Level
5
Credits
10
Purpose
People credited with this unit standard are able to demonstrate knowledge of:
normal HVDC operation, the effects of outages on HVDC operation, and
disturbances and trippings affecting the HVDC link.
Subfield
Electricity Supply
Domain
Electricity Supply - Power System Management
Status
Registered
Status date
16 April 2010
Date version published
16 April 2010
Planned review date
31 December 2014
Entry information
Open.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
Electricity Supply Industry Training Organisation
Accreditation and Moderation Action Plan (AMAP) reference
0120
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
This unit standard is intended for, but not restricted to, workplace assessment. The
range statements across the unit standard can be applied according to enterprise
specific equipment, procedures and processes.
2
Safety of personnel and plant must be a priority throughout the assessment. If the
safety requirements are not met the assessment must stop.
 New Zealand Qualifications Authority 2016
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3
Performance and work practices in relation to the elements and performance criteria
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. A full list of current legislation and industry codes is
available from the Electricity Supply Industry Training Organisation, PO Box 1245,
Waikato Mail Centre, Hamilton 3240.
4
The phrase in accordance with industry requirements is implicit in all elements and
performance criteria 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.
6
Asset owner refers to the owner of an electricity supply network that takes its point of
supply from Transpower NZ and delivers electricity to industrial, commercial, and
residential customers.
7
The range of this unit standard is limited to demonstrating a basic knowledge of the
fundamental circuits, arrangement, and operation of the HVDC transmission system
equipment as applied on the New Zealand HVDC Inter-Island power transmission.
8
Terms and abbreviations related to this unit standard:
HVDC – High voltage direct current
DC – Direct current
AC – Alternating current
Elements and performance criteria
Element 1
Demonstrate knowledge of normal HVDC operation.
Performance criteria
1.1
Configuration of main circuit equipment and related systems in the New Zealand
HVDC system is described.
Range
1.2
may include but is not limited to – HVDC single line diagram,
interconnecting transformer, communication circuits, runback
controller, fast reaction emergency dump (FRED) scheme, over
frequency trip, neutral earthing resistors.
Description identifies the control modes for pole operation.
Range
may include but is not limited to – separate current control mode,
joint current control mode, joint power control mode.
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1.3
Description identifies the power and current modulation functions.
Range
1.4
Description identifies the preferred pole loading.
Range
1.5
may include but is not limited to – direct voltage control (DVC)
function, reactive power control (RPC) function, AC filters, DC
harmonic filters.
Description identifies the preferred configuration of AC busbars.
Range
1.7
may include but is not limited to – minimising mercury arc valve
disturbances, submarine cable loading limits, Benmore
interconnecting transformer loading limits.
Description identifies the preferred voltage and reactive power control functions
and equipment.
Range
1.6
may include but is not limited to – ramp up, voltage stabiliser,
frequency stabiliser, spinning reserve sharing, emergency over
frequency control, Haywards islanded constant frequency control.
may include but is not limited to – Haywards 220kV bus, Haywards
110kV bus, Benmore 220kV bus.
Description identifies the terms associated with HVDC trips.
Range
may include but is not limited to – bipole tripping, Pole 1 tripping,
Pole 2 tripping, half pole 1A or 1B tripping.
Element 2
Demonstrate knowledge of the effects of outages on HVDC operation.
Performance criteria
2.1
Description identifies the effect of an outage of equipment associated with the
HVDC.
Range
may include but is not limited to – AC/DC converters, busbars,
circuit breakers and switches, communications, control and
protection cubicles, deluge systems, disturbance recorders,
electrode lines and stations, generators, half poles, harmonic
filters, poles, runbacks, SCADA, stabilisers, submarine cables,
synchronous condensers, transformers, transmission lines.
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19478 version 3
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Element 3
Demonstrate knowledge of disturbances and trippings affecting the HVDC link.
Performance criteria
3.1
Description identifies the disturbance recorder systems associated with the
HVDC.
Range
may include but is not limited to – data acquisition system (DAQ),
transient fault recorders (TFR), transient line fault locator (TLFL).
3.2
Description identifies the energisation of large transformers.
3.3
Description identifies the effect of AC system faults.
3.4
Description identifies the effect of DC line faults.
3.5
Description identifies the effect of signal oscillation problems.
3.6
Description identifies the effect of mercury arc valve faults.
Range
may include but is not limited to – consequential arc back (CAB).
Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP 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.
 New Zealand Qualifications Authority 2016