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×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)）
|
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.