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Test Examples >> Two Cases of SF6 CT Faults Detection Report                         AddTime:2009-7-15
      
 
 
Two Cases of SF"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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