Test standard for 132KV GIS
Article 6.3.4 of IEC 62271-1:2017 "General Requirements for High-Voltage Switchgear and Controlgear" clearly states that equipment with a rated voltage of 123 kV (the commonly used rated value in 132 kV systems) must meet 230 kV power frequency and 550 kV impulse withstand voltages. IEC 62271-200 also supplements and specifies the unique gas sealing and partial discharge testing requirements for GIS.
The test voltage for the AC withstand voltage of GIS (Gas Insulated Switchgear) must comply with the "Standard for Acceptance Tests of Electrical Equipment in Electrical Installation Projects" (GB50150-2016) and the "Guidelines for On-site Withstand Voltage and Insulation Tests of Gas Insulated Metal-Enclosed Switchgear" (DL/T555-2004). Generally, the factory acceptance test voltage is 80% of the factory test voltage (in special cases such as requirements of the State Grid's anti-accident measures, it may be increased to 100%, but this is not a common situation).
The rated voltage (Uₙ) of the 132kV GIS is 132kV, and the maximum operating voltage (Uₘ) is approximately 145kV (according to GB156-2017 "Standard Voltage", the maximum operating voltage corresponding to 132kV is 145kV).
According to the standard, the factory test voltage (Uₜₑₛₜ) is usually 1.8-2.0 times the maximum operating voltage (different standards may vary slightly), and the factory acceptance test voltage is 80% of the factory value.
Taking the maximum operating voltage of 1.86 times as an example (refer to the value for 110kV GIS: the maximum operating voltage of 110kV is 126kV, and the factory test voltage is 230kV = 126 × 1.86):
Factory test voltage:
U factory = 145 × 1.86 ≈ 270 kV (effective value, 1 minute)
Commissioning test voltage:
U commissioning = 270 × 0.8 = 216 kV (effective value, 1 minute)