amps21
Electrical
- Jan 10, 2006
- 70
Description :
SF6 breakers are directly mounted with MOSA (station class)on the line side. The arrester neutrals are connected to the interrupter end plate (as ground). There is a gasketed joint and quite a few metallic joints before the actual ground. (the equipment is grounded and arrester is connected to the equipment without seperate grounding)
Concern:
High impedence in the MOSA grounding circuit. Could be disasterous @ Surge frequencies causing MOSA to not function properly etc. Also could cause problems when MOSA is conducting (voltage due to assembly inductance @ currrent Rate of rise etc.)
Your thoughts on - Is seperate ground (which is easy enough to install) better compared to the existing setup or my concerns are invalid?
Thanks in advance
SF6 breakers are directly mounted with MOSA (station class)on the line side. The arrester neutrals are connected to the interrupter end plate (as ground). There is a gasketed joint and quite a few metallic joints before the actual ground. (the equipment is grounded and arrester is connected to the equipment without seperate grounding)
Concern:
High impedence in the MOSA grounding circuit. Could be disasterous @ Surge frequencies causing MOSA to not function properly etc. Also could cause problems when MOSA is conducting (voltage due to assembly inductance @ currrent Rate of rise etc.)
Your thoughts on - Is seperate ground (which is easy enough to install) better compared to the existing setup or my concerns are invalid?
Thanks in advance