HV disconnectors orientation towards OHL or power supply.
HV disconnectors orientation towards OHL or power supply.
(OP)
Hi Fellows,
I have question regarding 132kV vertical break disconnecting switch.
Is there any rule (IEC, ANSI, NEC, BS whatever) determining orientation of disconnector in relation to the incoming supply?
That means - jaw end shall be connected towards the incoming supply, while travelling blades side shall be connected to downstream circuit, or opposite?
Let look on typical disconnector at OHL bay.
After opening - jaw end shall be connected to overhead line, keeping the blades on the cut off side, or opposite orientation?
In case of double break or centerbreak DS it doesn't matter, but vertical DS?
Thanks for any guidance.
qqitek.
I have question regarding 132kV vertical break disconnecting switch.
Is there any rule (IEC, ANSI, NEC, BS whatever) determining orientation of disconnector in relation to the incoming supply?
That means - jaw end shall be connected towards the incoming supply, while travelling blades side shall be connected to downstream circuit, or opposite?
Let look on typical disconnector at OHL bay.
After opening - jaw end shall be connected to overhead line, keeping the blades on the cut off side, or opposite orientation?
In case of double break or centerbreak DS it doesn't matter, but vertical DS?
Thanks for any guidance.
qqitek.






RE: HV disconnectors orientation towards OHL or power supply.
RE: HV disconnectors orientation towards OHL or power supply.
RE: HV disconnectors orientation towards OHL or power supply.
I know of no code that requires this for HV switches, but if there no reason to do otherwise, I would do it at any voltage. In most cases, at 132 kV, there are other reasons, but here is an example:
Underhung hookstick disconnect connecting a power transformer (serving load) to a source bus. You can put the disconnect either way, but I would orient it so that the blade hinge is on the transformer side.
RE: HV disconnectors orientation towards OHL or power supply.
I wish more switchgear designers would ignore this when making connections to an FT type test switch!!
RE: HV disconnectors orientation towards OHL or power supply.
I've noticed in one of the book from ANSI world, that hinged side is always connected to the nearest circuit breaker side, while jaw end to the OHL side.
However in IEC world I couldn't found any guidance.
magoo2 - probably you are right
davidbeach - i would disagree.
Have a look on http://www.coelme-egic.com/-Vertical-Break-
regards
qqitek
RE: HV disconnectors orientation towards OHL or power supply.
RE: HV disconnectors orientation towards OHL or power supply.
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RE: HV disconnectors orientation towards OHL or power supply.