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Two Cases of SF6 "CT" Faults Detection Report
Reported by: Sichuang Electrical Power Research Institute
Detected by: Zhang Li, Wang Kai
Audited by: Tang Ping
Date: Jan. 13, 2009
There were two successive SF6 CT incidents in the mid-December in Sichuang Grid, our engineers used JH3000-2 to detect faults, they located the fault place quickly according to detection data, the facts matched the detection diagnosis, pls. see details below.
1. 500KV 5063 CT Phase A Fault at Tanjiawan Substation of Deyang Power Supply Bureau
On Dec. 12, 2008, 500KV 5063 CT Phase A had earth short circuit failure, the circuit breaker tripped off while switched on in a second then tripped off in 8 seconds again. The circuit breaker brand is ABB. Pls. see detection data as below:
Detection date: Dec. 14, 2008
|
Equipment |
Phase |
SO2 +SOF2 |
H2S |
CO |
Diagnosis |
|
5063 CT |
A |
110 |
70.2 |
4.8 |
High content of decomposition products, there is solid insulation material decomposition, turn off the power and check a.s.a.p. |
|
B |
0 |
0 |
2.0 |
Normal |
|
C |
0 |
0 |
1.3 |
Normal |
2. 220KV 264 Lower CT Phase B Fault at Jiuli Substation of Leshan Power Supply Bureau
On Dec. 18, 2008, 200KV 264 lower CT Phase B had off and on current fault by two times, then the equipment was turned off. The detection data was as below:
Detection date: Dec. 14, 2008
|
Equipment |
Phase |
SO2 +SOF2 |
H2S |
CO |
Diagnosis |
|
264 lower CT |
A |
0 |
0 |
9.6 |
Normal |
|
B |
0.99 |
0.12 |
72.7 |
High content of decomposition products, there is solid insulation material decomposition. |
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