IEC TS 63042-301:2018
(Main)UHV AC transmission systems - Part 301: On-site acceptance tests
UHV AC transmission systems - Part 301: On-site acceptance tests
IEC TS 63042-301:2018(E) applies to on-site acceptance tests of electrical equipment with the highest voltages of AC transmission system exceeding 800 kV.
General Information
Standards Content (Sample)
IEC TS 63042-301 ®
Edition 1.0 2018-12
TECHNICAL
SPECIFICATION
UHV AC transmission systems –
Part 301: On-site acceptance tests
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IEC TS 63042-301 ®
Edition 1.0 2018-12
TECHNICAL
SPECIFICATION
UHV AC transmission systems –
Part 301: On-site acceptance tests
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.01 ISBN 978-2-8322-6297-9
– 2 – IEC TS 63042-301:2018 © IEC 2018
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 General . 9
5 Power transformers . 9
5.1 General . 9
5.2 Leak testing with pressure (tightness test) . 10
5.3 Winding resistance measurement . 10
5.4 Ratio test . 10
5.5 Polarity check . 10
5.6 Insulation resistance test on each winding to earth and between windings
including bushings . 10
5.7 Dissipation factor (tan δ) and capacitance measurement on each winding to
earth and between windings . 10
5.8 Core and frame insulation check . 11
5.9 Tests on bushings . 11
5.9.1 Visual inspection . 11
5.9.2 Tan δ and capacitance measurement . 11
5.9.3 Tap withstand voltage . 11
5.10 Insulating oil tests . 11
5.11 Dissolved Gas Analysis (DGA) test . 12
5.12 Excitation current measurements at reduced voltage . 12
5.13 Frequency-response analysis (FRA) . 12
5.14 Short-circuit impedance measurement at reduced current . 12
5.15 Induced voltage tests with partial discharge measurement . 12
5.16 Applied voltage tests . 13
6 Circuit breakers . 13
6.1 General . 13
6.2 Dielectric test on main circuit . 13
6.3 Dielectric test on auxiliary circuit . 13
6.4 Measurement of the resistance of the main circuit . 14
6.5 Checks after installation including gas tightness tests, gas quality, insulation
resistance test . 14
6.5.1 General . 14
6.5.2 General checks . 14
6.5.3 Checks of electrical circuits . 14
6.5.4 Checks of the insulation and/or extinguishing fluid(s) . 14
6.5.5 Checks on operating fluid(s), where filled or added to on site . 15
6.5.6 Site operations . 15
6.6 Mechanical test and measurement . 15
6.7 Test of accessories . 16
7 GIS . 16
7.1 General . 16
7.2 Dielectric tests on the main circuits . 17
7.3 Dielectric tests on auxiliary circuits . 18
7.4 Measurement of the resistance of the main circuit . 18
7.5 Gas tightness tests . 19
7.6 Checks and verifications . 19
7.7 Gas quality verifications . 19
8 Surge arresters . 19
8.1 General . 19
8.2 Insulation resistance test . 19
8.3 Insulation resistance test of the base insulator . 20
8.4 Leakage current test . 20
8.5 Checks and verifications . 20
8.6 Tests of accessories . 20
9 Voltage and current transformers . 20
9.1 Capacitive voltage transformers (CVTs) . 20
9.1.1 General . 20
9.1.2 Insulation resistance measurement of low voltage terminal to earth
terminal . 21
9.1.3 Capacitance and dissipation factor (tan δ) measurement . 21
9.1.4 Tightness of the liquid-filled capacitor voltage dividers . 21
9.1.5 Winding resistance measurement of electromagnetic units . 21
9.1.6 Insulation resistance measurement of each component of
electromagnetic units . 21
9.1.7 Connection check between components of electromagnetic units . 21
9.1.8 Tightness of electromagnetic units . 21
9.1.9 Accuracy check (determination of error). 22
9.1.10 Damper check . 22
9.2 Bushing-type CTs . 22
9.2.1 General . 22
9.2.2 Insulation resistance test . 22
9.2.3 Resistance measurement . 22
9.2.4 Applied voltage test on secondary windings . 23
9.2.5 Determination of error and polarity check . 23
9.2.6 Excitation test . 23
10 Shunt reactors . 23
10.1 General . 23
10.2 Leak testing with pressure (tightness test) . 24
10.3 Winding resistance measurement . 24
10.4 Insulation resistance tests on each winding to earth and between windings
including bushings . 24
10.5 Dissipation factor (tan δ) and capacitance measurement on each winding to
earth and between windings . 24
10.6 Core and frame insulation check . 24
10.7 Tests on bushings . 24
10.7.1 Visual inspection . 24
10.7.2 Tan δ and capacitance measurement . 24
10.7.3 Tap withstand voltage . 25
10.8 Insulating oil tests . 25
10.9 DGA test . 25
10.10 Applied voltage tests . 25
11 Series compensators . 25
– 4 – IEC TS 63042-301:2018 © IEC 2018
11.1 General . 25
11.2 Test on capacitors . 26
11.3 Tests on metal oxide varistors . 26
11.4 Tests on damping equipment . 26
11.5 Tests on spark gaps . 27
11.6 Tests on current transformers . 28
11.7 Tests on by-pass switches . 29
11.8 Tests on disconnectors . 29
11.9 Tests on insulators . 30
11.10 Tests on control and protection systems . 30
12 Insulators . 30
12.1 General . 30
12.2 On-site acceptance tests of suspension insulators . 30
12.3 On-site acceptance tests of post insulators . 30
13 Disconnectors and earthing switches . 31
13.1 Air-insulated disconnectors . 31
13.1.1 General . 31
13.1.2 Dielectric test on control and auxiliary circuits . 31
13.1.3 Measurement of the resistance of the main circuit . 31
13.1.4 Design and visual Inspection . 31
13.1.5 Mechanical test . 31
13.2 Air-insulated earthing switches . 31
13.2.1 General . 31
13.2.2 Appearance check . 31
13.2.3 Dielectric tests on control and auxiliary circuits . 31
13.2.4 Mechanical test . 32
14 High-speed earthing switches (HSES) . 32
14.1 General . 32
14.2 Dielectric test on main circuit . 32
14.3 Dielectric test on auxiliary circuit . 32
14.4 Measurement of the resistance of the main circuit . 32
14.5 Checks and verifications after installation including gas tightness tests, gas
quality, insulation resistance test . 32
14.6 Mechanical tests and measurements . 32
14.7 Tests of accessories . 33
14.8 CB and HSES operating sequence test . 33
Bibliography . 34
Figure 1 – Delay time of opening resistor and pre-insertion time of closing resistor . 16
Table 1 – Requirements of insulating oil . 12
Table 2 – On-site test voltages . 18
Table 3 – Tan δ (%) of bushings . 27
Table 4 – Limiting value of tan δ (%) . 28
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UHV AC TRANSMISSION SYSTEMS –
Part 301: On-site acceptance tests
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
specification when
• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• the subject is still under technical development or where, for any other reason, there is the
future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC TS 63042-301, which is a Technical Specification, has been prepared by IEC technical
committee 122: UHV AC transmission systems.
– 6 – IEC TS 63042-301:2018 © IEC 2018
The text of this Technical Specification is based on the following documents:
Enquiry draft Report on voting
122/57/DTS 122/65A/RVDTS
Full information on the voting for the approval of this technical specification can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 63042 series, published under the general title UHV AC
transmission systems, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
INTRODUCTION
With the increase in voltage levels, the reliability and safety of high-voltage electric equipment
is facing new challenges. There is a need to have consensus on a series of technical criteria
and requirements for on-site acceptance tests for electrical equipment of UHV AC
transmission systems exceeding 800 kV to detect the damages or abnormal conditions that
may occur during the transportation and installation processes and to determine whether
equipment can be put into operation reliably and safely for power systems.
This Technical Specification proposes on-site acceptance tests, relevant test items, test
methods, and evaluation criteria for transformers, circuit breakers, GIS, surge arresters,
voltage and current transformers, shunt reactors, series compensators, insulators,
disconnectors, earthing switches and high-speed earthing switches.
– 8 – IEC TS 63042-301:2018 © IEC 2018
UHV AC transmission systems –
Part 301: On-site acceptance tests
1 Scope
This part of IEC 63042, which is a technical specification, applies to on-site acceptance tests
of electrical equipment with the highest voltages of AC transmission system exceeding 800 kV.
The electrical equipment exceeding 800 kV includes the following items:
• power transformers;
• circuit breakers;
• gas insulated switchgear (GIS);
• surge arresters;
• voltage and current transformers;
• shunt reactors;
• series compensators;
• insulators;
• disconnectors and earthing switches;
• high-speed earthing switches.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60376, Specification of technical grade sulfur hexafluoride (SF ) for use in electrical
equipment
IEC 60480, Guidelines for the checking and treatment of sulfur hexafluoride (SF ) taken from
electrical equipment and specification for its re-use
IEC 62271-1:2017, High-voltage switchgear and controlgear – Part 1: Common specifications
for alternating current switchgear and controlgear
IEC 62271-4, High-voltage switchgear and controlgear – Part 4: Handling procedures for
sulphur hexafluoride (SF ) and its mixtures
IEC 62271-100:2008, High-voltage switchgear and controlgear – Part 100: Alternating current
circuit-breakers
IEC 62271-102:2018, High-voltage switchgear and controlgear – Part 102: Alternating current
disconnectors and earthing switches
IEC 62271-112:2013, High-voltage switchgear and controlgear – Part 112: Alternating current
high-speed earthing switches for secondary arc extinction on transmission lines
IEC 62271-203, High-voltage switchgear and controlgear – Part 203: Gas-insulated metal-
enclosed switchgear for rated voltages above 52 kV
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
on-site acceptance tests
inspections and tests performed (or checked) in order to verify the correct operation and
dielectric integrity of the equipment after shipping and on-site installation
3.2
UHV AC
highest voltage of AC transmission system exceeding 800 kV
4 General
On-site acceptance tests for newly installed electrical equipment are an important approach to
judge whether equipment is normal or abnormal after transportation and installation.
Repetition of the full programme of routine tests, already performed in the factory is not
required; however some of the tests should be repeated for confirmation of the correct
operation of the equipment taking into account the different conditions on-site.
On-site acceptance test results should be analysed and compared carefully with those from
the factory test. The influence of different test conditions, such as humidity and the ambient
temperature and pressure, should be taken into consideration when making comparisons.
5 Power transformers
5.1 General
UHV power transformers have very high level of voltage, large capacity and large size. If the
UHV power transformer is adopted with split type installation on site, it is recommended to
carry out separate tests on the main transformer and the voltage regulating and compensating
transformer respectively.
NOTE For the procedure followed for on-site tests, the test method refers to the same kind of tests described in
relevant publications for factory tests, such as IEC 60076 and/or the IEC 60599 series.
UHV power transformers should be subjected to on-site acceptance tests as specified below:
• Leak testing with pressure (tightness test)
• Winding resistance measurement
• Ratio test
• Polarity check
• Insulation resistance test on each winding to earth and between windings including
bushings
– 10 – IEC TS 63042-301:2018 © IEC 2018
• Dissipation factor (tan δ) and capacitance measurement on each winding to earth and
between windings including bushings
• Core and frame insulation check
• Tests on bushings
• Insulating oil test
• Dissolved gas analysis (DGA) test
• Excitation current measurement at low voltage
• Frequency-response analysis (FRA)
• Short-circuit impedance measurement
The following items are optional:
• Induced voltage test with partial discharge measurement
• Applied voltage test
NOTE The above optional test items are based on agreement between purchaser and supplier.
5.2 Leak testing with pressure (tightness test)
The transformer main tank should withstand a pressure of 30 kPa or any specified value
pressure applied on the top-level of oil in the oil conservator and maintained for 24 hours or
any specified period without any leakage and damage.
5.3 Winding resistance measurement
Winding resistance measurement tests should include the following:
• Measurement should be performed for all windings at all tap positions (if any).
• Measured values should be compared with the factory test results. The deviation should
be within ±5 % or otherwise specified.
• Measured values should be compared with the average value of three phase windings.
The deviation should be within ±3 % or otherwise specified.
5.4 Ratio test
Ratio tests should include the following:
• The voltage ratio should be measured on each tap.
• Voltage ratio should correspond to the value on nameplate and the factory test result.
5.5 Polarity check
The polarity of single-phase transformers should be checked. The polarity should be the same
as that identified on the nameplate.
5.6 Insulation resistance test on each winding to earth and between windings
including bushings
Insulation resistance tests should be made for each winding with respect to earth and
between windings.
5.7 Dissipation factor (tan δ) and capacitance measurement on each winding to earth
and between windings
Dissipation factor (tan δ) and capacitance measurement on each winding to earth and
between windings should include the following:
• Terminals to be tested should be connected to the test instrument and the terminals not
being tested should be short-circuited and connected to earth. Test voltage should be
10 kV or agreement between purchaser and supplier.
• Tan δ measurement results should be compared with the factory test result considering the
temperature difference and the difference should be within ±0,001 or otherwise specified.
The difference of the capacitance value should be within ±1 % of the factory test result or
otherwise specified.
5.8 Core and frame insulation check
Insulation resistance check should be made between core to frame, core to tank and frame to
tank. For details see IEC 60076-1.
5.9 Tests on bushings
5.9.1 Visual inspection
Visual inspections should be made on each bushing. See 9.10 of IEC 60137:2017.
5.9.2 Tan δ and capacitance measurement
• The measurement is only applicable to capacitance-graded bushings. After installation of
the transformer and reactor bushings, tan δ and capacitance of the insulation should be
measured. The test voltage should be 10 kV or agreement between purchaser and
supplier. Voltage tap (if any) should be short-circuited with the test tap.
• The deviation between measured capacitance value and factory test value should be lower
than ±1 %, depending on the number of layers up to 5 % or agreement between purchaser
and supplier.
See 9.1 of IEC 60137:2017.
5.9.3 Tap withstand voltage
A rated frequency voltage withstand test should be applied to or induced at the tap for 1 min
with the bushing mounting flange earthed. The voltage tap should be tested at 20 kV or
agreement between purchaser and supplier. The test tap should be tested at 2 kV or
agreement between purchaser and supplier.
For voltage tap, different suppliers may give different suggested value of test voltage. It is
advised to refer to the product specification or consult the supplier before testing.
5.10 Insulating oil tests
The test requirements of insulating oil filling into electrical equipment should be as per Table
1 or agreement between purchaser and supplier.
– 12 – IEC TS 63042-301:2018 © IEC 2018
Table 1 – Requirements of insulating oil
No. Item Requirements
1 Visual examination Transparent, inclusion-free, no suspended matter
2 Particle count in oil Granularity(5 µm ~ 100 µm): ≤ 1 000/100 mL
Granularity (> 100 µm): None
3 Dielectric strength (kV)
≥70（2.5 mm gap, spherical electrode）
4 Dissipation factor (90 °C) % After filling into equipment ≤ 0,7
5 Water content mg/ kg (50 °C) ≤10 after filling
6 Total dissolved gas ≤ 0,5
(volume fraction) %
7 DGA Refer to relevant clauses of this document
NOTE 1 For details see IEC 60422 and IEC 60296.
NOTE 2 Requirement criteria of insulating oil are means of the finished of all oil treatment.
5.11 Dissolved gas analysis (DGA) test
The DGA test should be carried out after the completion of oil treatment. If a dielectric test is
required, the DGA test should be carried out after the dielectric test. See IEC 60599.
5.12 Excitation current measurements at reduced voltage
Excitation current measurements at low voltage should include the following:
• The excitation current should be measured at the same low test voltage as the factory test.
The test should be carried out before the winding resistance measurement to avoid the
influence of residual flux in the core.
• The value of excitation current at low test voltage should be compared with the factory test
results. The difference should be less than 30 % or agreement between purchaser and
supplier.
NOTE If a higher excitation current is needed a higher voltage could be applied.
5.13 Frequency-response analysis (FRA)
The FRA should be performed for each winding of transformers. For details see IEC 60076-18.
5.14 Short-circuit impedance measurement at reduced current
A short-circuit impedance measurement at reduced current should include the following:
• The short-circuit impedance should be measured at the same reduced current as in the
factory test.
• The value of short-circuit impedance at reduced current should be compared with the
factory test result. The difference should be less than 5 % or agreement between
purchaser and supplier.
As an option, if purchaser and supplier agree, Subclauses 5.15 and 5.16 may be applicable.
5.15 Induced voltage tests with partial discharge measurement
The test may be made on-site. For details see IEC 60076-3. The value of the accepted partial
discharge may be agreed between purchaser and supplier.
5.16 Applied voltage tests
The test may be made on-site. For details see IEC 60076-3. The applied voltage test may
include the following:
• The test voltage may be applied between all terminals of the winding under test connected
together and all terminals of the remaining windings, core, frame and tank of the
transformer, connected together to earth;
• Test voltage may be 80 % of the factory test value and the time duration may be 1 minute,
or agreement between purchaser and supplier;
• The test voltage may be as nearly as possible to a sine-wave form. The peak value
divided by √2 may be equal to the test value;
• The test is successful if no collapse of the test voltage occurs.
6 Circuit breakers
6.1 General
After installation, and before being put into service, the circuit breaker (CB) should be tested
in order to check the correct operation and the dielectric integrity of the equipment.
A programme of site commissioning checks and tests should be agreed between supplier and
purchaser. Repetition of the full programme of routine tests, already performed in the factory
is not required; however some of the tests should be repeated for confirmation of
• absence of damage;
• compatibility of separate units;
• correct assembly;
• correct performance of the assembled circuit-breaker.
In general, this is achieved when the commissioning tests include, but are not limited to the
following test program with a record of the test results in a test report:
• Dielectric test on main circuit;
• Dielectric test on auxiliary circuit;
• Measurement of the resistance of the main circuit;
• Checks after installation including gas tightness test, gas quality, insulation resistance test;
• Mechanical test and measurement;
• Test of accessories.
The supplier and purchaser should agree on a commissioning test plan for tests on site.
6.2 Dielectric test on main circuit
For dielectric tests on the main circuit of circuit breaker, power frequency voltage test should
be performed and the test voltage and procedure on main circuit for circuit breaker are the
same as that for the metal-enclosed switchgear and controlgear. See Subclause 7.2.
6.3 Dielectric test on auxiliary circuit
Dielectric tests on auxiliary circuits should be performed to confirm that transportation and
storage of the circuit-breaker have not damaged these circuits. However, it is recognized that
such circuits contain vulnerable sub-components and the application of the full testing voltage
for the full duration can cause damage. In order to avoid this, and to avoid the temporary
removal of proven connections, the supplier should detail the test process that demonstrates
that damage has not occurred as well as the method of recording the results from this test
process.
– 14 – IEC TS 63042-301:2018 © IEC 2018
See also 10.2.102.3.1 of IEC 62271-100:2008.
6.4 Measurement of the resistance of the main circuit
Measurement of the resistance of the main circuit need only be made if interrupting units have
been assembled on site. The measurement should be made with a direct current in
accordance with 10.2.102.3.2 of IEC 62271-100:2008.
Dynamic resistance measurements (DRM) could be carried out as an additional tool for the
assessment of the condition of the circuit-breaker during its lifetime.
6.5 Checks after installation including gas tightness tests, gas quality, insulation
resistance test
6.5.1 General
The supplier should produce a programme of commissioning checks and tests. This should be
based on, but is not limited to, the programme of checks and tests given here.
6.5.2 General checks
• Assembly conforms to supplier's drawings and instructions;
• Tightness of circuit-breaker, its fastenings, fluid systems and control devices;
• External insulation and, where applicable, internal insulation are undamaged and clean;
• Paint and other corrosion protection are sound;
• Operating devices, especially operating releases, are free from contamination;
• Adequacy and integrity of the earth connection up to and including the interface with the
substation earthing system;
and, where applicable:
• Record the number on the operations counter(s) at delivery;
• Record the number on the operations counter(s) at completion of all on-site testing;
• Record the number on the operations counter(s) at first energization.
6.5.3 Checks of electrical circuits
• Conformity to the wiring diagram.
• Correct operation of signaling (position, alarms, lockouts, etc.).
• Correct operation of heating and lighting.
6.5.4 Checks of the insulation and/or extinguishing fluid(s)
For UHV gas filled CB SF is commonly used.
• Check of filling pressure/density
• Quality checks, to confirm the acceptance levels of IEC 60376, IEC 60480 and
IEC 62271-4. These quality checks are not required on sealed equipment and new gas
used from sealed bottles. A dew point check and a check of the total impurities should be
carried out to confirm the supplier's acceptance levels.
In addition to the quality issues for SF , the following checks for gas mixtures should be
performed:
• Quality to be confirmed prior to energization.
6.5.5 Checks on operating fluid(s), where filled or added to on site
Subclause 10.2.102.1.4 of IEC 62271-100:2008 is applicable.
6.5.6 Site operations
See 10.2.102.1.5 of IEC 62271-100:2008.
6.6 Mechanical test and measurement
The mechanical tests and measurements should be taken in order to compare them with the
values both recorded during the routine tests and guaranteed by the supplier. These values
serve as the reference for future maintenance and other checks and will enable any drift in
operating characteristics to be detected.
These measurements involve a check of the operation of the alarm and lockout devices
(pressure switches, relays, transducers, etc.) where applicable:
• Measurements of the characteristic insulating and/or interrupting fluid pressures (where
applicable)
• Measurements of characteristic operating fluid pressures (if applicable)
• Measurement of consumption during operations (if applicable)
• Verification of the rated operating sequence
• Measurement of time quantities
• Record of mechanical travel characteristics
• Checks of certain specific operations
Subclause 10.2.102.2 of IEC 62271-100:2008 is applicable with the following addition:
• Verification of timing of opening resistor and closing resistor
• Verification of delay time between opening time of main interrupter and opening resistor
interrupter
NOTE 1 This test generally applies to CB with opening and / or closing resistor.
• Verification of pre-insertion time of closing resistor
NOTE 2 This test generally applies to CB with closing resistor. For details see Figure 1.
– 16 – IEC TS 63042-301:2018 © IEC 2018
a) Opening operation b) Closing operation
Figure 1 – Delay time of opening resistor and pre-insertion time of closing resistor
6.7 Test of accessories
Further tests can be done depending on the agreement between supplier and purchaser. The
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