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

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Test Object and Requirement

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

Test Object

Specifications

Test Frequency

Test Voltage

Test Time

Power cable

170kV/2000mm2/10km

Capacitance ≤2μF

30-300Hz

150kV

15 mins

Power cable

400kV/2000mm2/5km

Capacitance ≤0.6μF

 

30-300Hz

220kV

15 mins

GIS

400kV and below  Capacitance ≤0.02μF

30-300Hz

Max. 750kV

 

 

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×106=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×106=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))

 

                REACTORS

 

TEST OBJECT

Testing Voltage (kV)

REACTOR    2500KVA/150kV  

OUTPUT VOLTAGE OF EXCITING TRANSFORMER

170KV Power Cable

150

4 pcs reactors in paralleled

7.5KV

400KV Power Cable

220

2 pcs reactors in series, then two groups in parralled

15kV

400kV GIS

512

4 pcs in series

30kV

 

No.

Name

Module No. & Specs

Quantity

1

Exciting Transformer

SXJB-500kVA/7.5kV/15kV/30kV/

1 set

 

2

Variable frequency power supply

SXBP-500kW/380V/220V

1 set

3

HV Reactor

SXDK-2500kVA/150kV

4 pcs

4

Capacitive Divider

SXFR-150 kV -1000 pF

1 set

5

Connecting Cable

Accessories are as Table I.

1 set

6

Factory Test Report

 

1 copy

7

User's Guide

 

1 copy

Please contact Sansion Power: sansionpower@hotmail.com for further information.