1 Test requirements:

  1.1. AC withstand voltage test for 300mm2/10kV cable, length 3 km. Test time 5min, test voltage 22kV, test frequency 30~300Hz, equivalent capacitance 0.418uF/km.

2 Reactor design:

  2.1. AC withstand voltage test for 300mm2/10kV cable, length 3 km, test time 5min, test voltage 22kV, test frequency 30~300Hz, equivalent capacitance 1.254uF. When frequency is 35Hz.

Test current I=ωCXUtest=2×3.14×35×1.254×22×10-3=6A

Corresponding reactor inductance L=1/ω2C =16.5H

3 Reactor configuration:

  3.1. AC withstand voltage test for 300mm2/10kV cable, length 3 km, maximum test voltage 22kV. For easy handling, the reactor is divided into three sections, each with a voltage of 30kV, a current of 2A, and an inductance of 50H.

Verification:

1) AC withstand voltage test for 300mm2/10kV cable, length 3 km, test time 5min, test voltage 22kV, test frequency 30~300Hz, equivalent capacitance 1.254uF. Use three reactors in parallel, with rated inductance 16.6H, rated voltage 30kV, rated current 6A.

Test frequency: f=1/2π√LC = 34.8Hz

Test current I=ωCXUtest=2×3.14×34.8×1.254×22×10-3=6A

4 Excitation transformer configuration:

  4.1. Since the quality factor Q is not less than 20 at rated load, the excitation transformer is the total reactor capacity 180KVA, divided by quality factor 20 to get 10KVA.

  4.2. The configured excitation transformer specification is YHXZB—10KVA/1.5kv/3kv.

5 Frequency conversion power supply configuration:

  5.1. The capacity of the frequency conversion power supply is equal to or greater than that of the excitation transformer, taken as 10kvA.

  5.2. The configured frequency conversion power supply specification is YHXZB—10kvA.

6 Capacitive voltage divider configuration:

  6.1. Since the maximum test voltage is 22kV, the capacitive voltage divider voltage is 30kV, capacitance 10000PF.

  6.2. Configure 1 capacitive voltage divider with specification FRC—30kv/0.01uF.