10000kVA/600kV Variable Frequency Resonant (VF) Test System-Solution Brief

Test Object and Requirement

The system is specially designed for AC withstand voltage test for below items, with below specifications and requirements.

Capacity Determination of the equipment:

4pcs Reactors will be designed, each reactor is 2500 kVA/150kV. Capacity amount is 10000kVA.

Determination:

1) When to do AC withstand voltage testing on 170kV 2000mm² 10kM power cable.

Using 4pcs reactors in paralleled.

Output 150kV/66.6A, testing current is calculated as below:

I=U×10³×ω×C×10^－6=66A （U：150kV，C：2uF，ω＝2πf (f=35Hz)）

2) When to do AC withstand voltage testing on 400kV 2000mm² 5kM power cable,

Using 2pcs reactors in series and then these two groups in paralleled.

Output 300kV/33.3A, testing current is calculated as below:

I=U×10³×ω×C×10^－6=29A （U：220kV，C：0.6uF，ω＝2πf (f=35Hz)）

3) When to do AC withstand voltage testing on 400kV and below voltage degree GIS and etc. equipment, the capacitance is 0.02 uF,

Using 4pcs reactors in series, output 600kVA/16.6A, resonant frequency and testing current is calculated as below:

I=U×10³×ω×C×10^－6=3.3A （U：512kV，C：0.02uF，ω＝2πf (f=50Hz)）