Transient Fault 132 kv single circut
Transient Fault 132 kv single circut
(OP)
hi there,
this year,we face nine transient fault on 132kv single circut and there is no indiction!nothing
i need your help
informations on these problem:
1-it always happens mid night and early morning
2-weather is dry
3-there is auto reclosuer
4-insulations are good ,we did tests and results were ok(dust and flashover on them)
5-old lines: 70km and 90km
6-Distance relay((Static relay (PDS)
this year,we face nine transient fault on 132kv single circut and there is no indiction!nothing
i need your help
informations on these problem:
1-it always happens mid night and early morning
2-weather is dry
3-there is auto reclosuer
4-insulations are good ,we did tests and results were ok(dust and flashover on them)
5-old lines: 70km and 90km
6-Distance relay((Static relay (PDS)






RE: Transient Fault 132 kv single circut
RE: Transient Fault 132 kv single circut
-phase fault or ground fault? or a mixture?
-any fog, salt fog, recent high winds?
-is protection duplicated? If so, do both operate?
are the VT circuits ok?
has this just started tohappen, or is it an on-going problem?
if it is recent, does it coincide with changes on the system or in the substation wiring?
Bung
Life is non-linear...
RE: Transient Fault 132 kv single circut
it was our opinion but its wrong.... thx alot
hi Bung
more information:
-ground fault only
-Distance and OVERVOLTAGE(ONLY DISTANCE operates)
-are the VT circuits ok? i'm not sure
-same problems since 2000
-only this year from 1/1/2012 to 20/03/2012 3 Transient Faults
RE: Transient Fault 132 kv single circut
Did the Substation crew manual switch manoeuvres to connect or disconnect line ?
If it is at night could be a result of a human wrong manoeuvre.
RE: Transient Fault 132 kv single circut
4-insulations are good ,we did tests and results were ok(dust and flashover on them)
5-old lines: 70km and 90km
-same problems since 2000
-only this year from 1/1/2012 to 20/03/2012 3 Transient Faults
-------------------------------------
electrical discharge strike on 90km old transmission line in a region with bad weather , where insulations have changed since year 2000,, and very FAR from subestation where weather is DRY
, but occurs results shot reclosure on the line.