·GB/T11024.1 Shunt Capacitors for A.C. Power Systems Having a Rated Voltage above 1kV - Part 1: General

·GB/T11024.2 Shunt Capacitors for A.C. Power Systems Having a Rated Voltage above 1kV - Part 2: Aging Testing

·GB/T11024.3 Shunt Capacitors for A.C. Power Systems Having a Rated Voltage above 1kV - Part 2: Aging Testing

·GB/T11024.4 Shunt Capacitors for A.C. Power Systems Having a Rated Voltage above 1kV - Part 2: Aging Testing

·DL/T840 Specification of High-voltage Shunt Capacitors for Service

·GB/T311.2 Insulation Co-ordination Part 1: Definitions, Principles and Rules

·IEC 60871-1 Shunt capacitor for a.c. power systems having a rated voltage above1000V-Part1: General

·IEC 60871-2 Shunt capacitor for a.c. power systems having a rated voltage above1000V-Part2: Endurance testing

·IEC 60871-3 Shunt capacitor for a.c. power systems having a rated voltage above1000V-Part3: Protection of shunt capacitor and shunt capacitor banks

·IEC 60871-4 Shunt capacitor for a.c. power systems having a rated voltage above1000V-Part4: internal fuses

1. The dielectric between the electrodes of the capacitor can withstand one of the following two test voltages for 10 seconds:

a. Power frequency AC voltage: U_t (~)=2.0U_N b. DC voltage: U_t (-)=4.0U_N

2. The difference between the measured capacitance value and the rated value of the capacitor does not exceed -2%-+3%.

3. The tangent value (tanδ) of the loss angle of the capacitor at a rated power frequency voltage and a temperature of 20℃ is:

Capacitors with internal fuses: tanδ≤0.02%; capacitors without internal fuses: tanδ≤0.015%.

4. Discharge resistance: The capacitor is equipped with built-in discharge resistors, ensuring that the discharge resistance drops from√2U_N to 75V or below 50V within 10 minutes.

5. Short-circuit discharge capability: The capacitor can withstand 5 times of 2.8UN short-circuit discharges within 10 minutes.

6. Fuse isolation: The upper and lower voltage limit is 2.5√2U_N, and 0.8√2U_N, respectively. After the fuse operates, the rupture withstands a DC test voltage of 3.5UNE (UNE is the component voltage) and an AC test voltage of 2.15U_NE.

7. Partial discharge performance

1) Inter-electrode partial discharge:

After imposing voltage on the capacitor for 1 second after the partial discharge starts, then reducing the voltage to 1.35U_N for 10 minutes, and subsequently increasing the voltage to 1.6U_N and maintaining it for 10 minutes, no obvious partial discharge occurs in this process. For application in extremely cold regions, the capacitor’s partial discharge quenching voltage is not less than 1.2U_N at the lower temperature limit.

2) Electrode-to-shell partial discharge quenching voltage:

The electrode-to-shell partial discharge quenching voltage is not less than 1.2U_lm (U_lm is the maximum operating line voltage).

8. Overload capability

1) Operating overvoltage: The capacitor can withstand the transient overvoltage of the first peak not exceeding 2√2U_N for 1/2 cycle.

2) Maximum permissible current: The capacitor is designed to operate under a steady overcurrent with an effective value of 1.3IN caused by voltage rise and high harmonics. For capacitors with the maximum positive deviation, this overcurrent is permissible up to 1.43 times.

3) Long-term voltage