VARIABLE FREQUENCY POWER SOURCE

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))