1 Test requirements:

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

2 Design of reactor:

  2.1. AC withstand voltage test for 300mm2/10kv cable, length 3 kilometers, test time 5min, test voltage 22kv, test frequency 30~300Hz, equivalent capacitance is 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 Configuration of reactors:

  3.1. AC withstand voltage test for 300mm2/10kv cable, length 3 kilometers, maximum test voltage 22kv, for easy handling, the reactor is divided into three sections, each reactor voltage is 30KV, each section current is 2A, each section inductance is 50H.

Verification:

1) AC withstand voltage test for 300mm2/10kv cable, length 3 kilometers, test time 5min, test voltage 22kv, test frequency 30~300Hz, equivalent capacitance is 1.254uF. Use three reactors in parallel, rated inductance is 16.6H, rated voltage is 30kv, rated current is 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 Configuration of excitation transformer:

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

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

5 Configuration of frequency conversion power supply:

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

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

6 Configuration of capacitive voltage divider:

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

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