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The following tests shall be routinely performed on each component or assembly during production as noted. In addition routine tests shall be performed on included equipment which design is governed by separate standards (i.e., circuit breakers, instrument transformers, bushings, and surge arresters) in accordance with the applicable standards.

7.1 Dielectric test of main circuit37

7.1.1 Power-frequency withstand voltage test

Dielectric withstand tests shall be performed on each switchgear assembly at the minimum gas pressure. Routine dielectric tests shall be conducted to verify the one-minute withstand level specified in Table 1 for the following conditions:

⎯ Phase to ground

⎯ Phase to phase (if a three-phase enclosure assembly)

⎯ Across open switching device line-to-ground voltage shall be applied (this may be conducted from one side of the switch only)

For power-frequency dielectric testing, frequencies from 48 Hz to 62 Hz are considered equivalent.

7.1.2 Partial discharge testing

The measurement of partial discharges shall be performed to detect possible material and manufacturing defects. Partial discharge tests shall be performed in accordance with 6.2.9. The measurement of partial discharges shall be performed with dielectric tests after mechanical routine tests. The test shall be carried out on all components of the gas-insulated switchgear. It may be performed on the complete installation, if applicable, or on transport units or on individual components. Tests on simple components containing no solid insulation may be excluded.

7.2 Tests on auxiliary and control circuits38

7.2.1 General

Inspection of auxiliary and control circuits, and verification of conformity to the circuit diagrams and wiring diagrams shall be made.

The nature of the materials, the quality of assembly, the finish and, if necessary, the protective coatings against corrosion shall be checked. A visual inspection is also necessary to check the satisfactory installation of the thermal insulation.

A visual inspection of actuators, interlocks, locks, etc., shall be made.

Components for auxiliary and control circuits inside enclosures shall be checked for proper mounting. The location of the means provided for connecting external wiring shall be checked that there is sufficient wiring space for spreading of the cores of multi-core cables and for the proper connection of the conductors.

37 _{Extracts used from 7.1 of IEC 62271-203 with permission. Copyright © 2003 IEC Geneva, Switzerland. www.iec.ch.} 38 _{Extracts used from 7.2 of IEC 62271-1 with permission. Copyright © 2007 IEC Geneva, Switzerland. www.iec.ch.}

The conductors and cables shall be checked for proper routing. Special attention shall be given to make certain that no mechanical damage can occur to conductors and cables due to the proximity of sharp edges or heating elements, or to the movement of moving parts.

The identification of components and terminals and, if applicable, the identification of cables and wiring shall be verified. Auxiliary and control circuits shall conform to the schematics, wiring diagrams, and technical data provided by the manufacturer. Technical data may include the number, class, type, capacity of available contacts, and electrical power of shunt releases (other than auxiliary and control contacts, electrical power of shunt releases, etc.).

7.2.2 Functional tests

A functional test of all low-voltage circuits shall be made to verify the proper functioning of auxiliary and control circuits in conjunction with the other parts of the switchgear. The test procedures depend on the nature and the complexity of the low-voltage circuits of the device. These tests are specified in the relevant standards for switchgear. They shall be performed with the upper and lower limits values of the supply voltage defined in 4.8.3 of IEEE Std C37 100.1.

Operation tests on low-voltage circuits, sub-assemblies and components can be omitted if they have been fully tested during a test applied to the whole switchgear and controlgear.

7.2.3 Verification of protection against electrical shock

Protection against direct contact with the main circuit and safe accessibility to the auxiliary and control equipment parts liable to be touched during normal operation shall be checked by visual inspection. Where visual inspection is not considered sufficient, the electrical continuity of grounded metallic parts should be checked by application of a dc current of at least 30 A between the metallic parts and the grounding point. The voltage drop shall be less than 3 V.

7.2.4 Dielectric tests

Only power-frequency withstand voltage tests shall be performed. This test shall be made under the same conditions as those detailed in 6.2.10. All control wiring associated with current and linear coupler transformer secondaries and potential device secondaries shall receive a power-frequency withstand test of 2500 V for one minute. All other control wiring shall receive a power-frequency withstand test of 1500 V for 1 min or 1800 V for 1 sec.

7.3 Measurement of the resistance of the main circuit

Subclause 7.3 of IEEE Std C37.100.1-2007 applies.

7.4 Tightness tests

Leakage tests on the shipping assemblies to confirm compliance with allowable leakage rate shall be performed.

7.5 Pressure tests of enclosures39

Pressure tests shall be made on enclosures after complete machining. The standard test pressure shall be:

⎯ 1.3 times design pressure for welded aluminum and welded steel enclosures ⎯ 2 times design pressure for cast aluminum and composite aluminum enclosures

The test pressure shall be maintained for at least 1 min. No rupture or permanent deformation should occur during this test.

7.6 Mechanical operation tests40

Operation tests are made to verify that the switching devices comply with the prescribed operating conditions and that the mechanical interlocks work properly.

Switching devices of GIS shall be submitted to a mechanical routine test in accordance with their relevant standards. All position indication devices shall be verified to be in proper working order. The mechanical routine tests can be made before or after assembly of transport units.

7.7 Tests on auxiliary circuits, equipment, and interlocks in the control

mechanism41

All auxiliary equipment shall be tested either by a functional operation or by verification of the continuity of wiring. Settings of relays or sensors shall be checked.

The electrical, pneumatic, and other interlocks, together with control devices having a predetermined sequence of operations, shall be tested five times in succession in the intended conditions of use and operation and with the most unfavorable limit values of auxiliary supply. During the test no adjustment shall be made.

The tests are considered to be satisfactory if the auxiliary devices have operated properly, if they are in good operating condition after the tests, and if the force to operate the switching device is practically the same before and after the tests.

NOTE—These tests may be performed at the installation site if this location is more practical.

7.8 Pressure test on partitions42

Each partition shall be subjected to a pressure test at twice the design pressure for 1 min in the weakest direction. For the pressure test the partition shall be secured in exactly the same manner as in service. The partition shall not show any sign of overstress or leakage.