·GB/T11024.1《Parallel capacitor for AC power systems with nominal voltages above 1kV Part 1: General Principles》
·GB/T11024.2《Parallel capacitor for AC power systems with nominal voltages above 1kV Part 2: Aging test》
·GB/T11024.3《Parallel capacitor for AC power systems with nominal voltages above 1kV Part 3: Protection of parallel capacitor and parallel capacitor banks》
·GB/T11024.4《Parallel capacitor for AC power systems with nominal voltages above 1kV Part 4: Internal fuse》
·DL/T840《Technical conditions for the use of high-voltage parallel capacitor》
·GB/T311.2《Insulation coordination Part 1: Definitions, principles and rules》
·IEC 60871-1《Shunt capacitor for a.c.power systemshaving arated voltageabove1000V-Part1:General》
·IEC 60871-2《Shunt capacitor for a.c.power systemshaving arated voltageabove1000V-Part2:Endurance testing》
·IEC 60871-3《Shunt capacitor for a.c.power systemshaving arated voltageabove1000V-Part3:Protection of shunt capacitor and shunt capacitorbanks》
·IEC 60871-4《Shunt capacitor for a.c.powersystemshavingaratedvoltageabove1000V-Part4:internal fuses》
1. The dielectric between the capacitor electrodes can withstand one of the following two test voltages for 10s.
a. Power frequency AC voltage: Ut(～)=2.0UNb. DC voltage: Ut (一)=4.0UN
2. The difference between the measured capacitance value and the rated value of the capacitor shall not exceed -2%～+3% of the rated value.
3. The loss tangent value (tanδ) of the capacitor at the rated power frequency voltage and the temperature of 20℃ is: capacitor with internal fuse: tanδ≤0.02%, capacitor without internal fuse: tanδ≤0.015%.
4. Discharge resistance: Capacitors are equipped with built-in discharge resistance, which drops from √2UN to 75V or below 50V within 10min.
5. Short-circuit discharge capability: Capacitors can withstand 5 short-circuit discharges of 2.8UN within 10min.
6. Fuse isolation: The upper limit voltage is 2.5√2UN, and the lower limit voltage is 0.8√2Un. After the fuse is operated, the break withstands a DC test voltage of 3.5UnE (UNE is the component voltage) and an AC test voltage of 2.15UNE.
7. Partial discharge performance
1) Inter-electrode partial discharge
Pressurize the capacitor to the point where partial discharge starts for 1s, then reduce the voltage to 1.35UN and keep it for 10min, then increase the voltage to 1.6UN and keep it for 10min. At this time, there is no obvious partial discharge. For severely cold regions, the partial discharge extinction voltage of the capacitor at the lower limit of temperature shall not be less than 1.2UN.
2) Pole-to-shell partial discharge extinction voltage
The pole-to-shell partial discharge extinction voltage shall not be less than 1.2Um (Um is the highest operating line voltage).
8. Overload capacity
1) Operation overvoltage: The capacitor can withstand the transition overvoltage with the first peak value not exceeding 2√2UN for 1/2 cycle.
2) Maximum allowable current: The capacitor is allowed to operate under a stable overcurrent with an effective value of 1.3In caused by voltage rise and high-order harmonics. For capacitor with the maximum positive deviation of capacitance, this overcurrent is allowed to reach 1.43 times.
3) Long-term voltage
