The switch is on the line side of a HVB (high voltage breaker). It simply isolates the breaker from the incoming voltage which actually only travels about 6 miles straight from the nuclear plant straight to where we are located. We use around 250 to 300 MWH. If this switch were to open while under load (breaker closed), a horrific arc flash fire would occur and probably damage all of the nearby components before the next fail-safe kicked in. This could all happen in a matter of seconds.
@NigelGriff yea,,thanks for the correction. what cause the arcing? do the mechanism of disconnecting current happened when there's voltage around or it's stopped before we open the switch?
sorry for bad english but many thanks,,, i really need this info ^__^
@cutev3 There is already a massive current flowing through the circuit. They need a circuit breaker like this to physically break apart the circuit to stop it flowing as a small gap would mean the electricity would just arc across. This mechanism stops the circuit flow.
@NigelGriff wrong! this is an isolation switch and not a circuit breaker. if you opened this switch under load it would completely vaporize and the operator would be showered with molten metal. these switches are placed before and after circuit breakers, transformers, reactors, etc so those components can be worked on. they open the circuit with the circuit breaker then they open these isolation switches. the arc you see is static electricity from 100's of miles transmission lines
The switch is on the line side of a HVB (high voltage breaker). It simply isolates the breaker from the incoming voltage which actually only travels about 6 miles straight from the nuclear plant straight to where we are located. We use around 250 to 300 MWH. If this switch were to open while under load (breaker closed), a horrific arc flash fire would occur and probably damage all of the nearby components before the next fail-safe kicked in. This could all happen in a matter of seconds.
chrisw754 5 months ago 5
waw..big arching
cutev3 11 months ago
@cutev3 arcing
NigelGriff 11 months ago
@NigelGriff yea,,thanks for the correction. what cause the arcing? do the mechanism of disconnecting current happened when there's voltage around or it's stopped before we open the switch?
sorry for bad english but many thanks,,, i really need this info ^__^
cutev3 9 months ago
@cutev3 There is already a massive current flowing through the circuit. They need a circuit breaker like this to physically break apart the circuit to stop it flowing as a small gap would mean the electricity would just arc across. This mechanism stops the circuit flow.
NigelGriff 9 months ago
@NigelGriff wow,,,,gr8... many thanks :)
cutev3 8 months ago
@NigelGriff wrong! this is an isolation switch and not a circuit breaker. if you opened this switch under load it would completely vaporize and the operator would be showered with molten metal. these switches are placed before and after circuit breakers, transformers, reactors, etc so those components can be worked on. they open the circuit with the circuit breaker then they open these isolation switches. the arc you see is static electricity from 100's of miles transmission lines
sw8741 6 months ago
@sw8741 probably, i'm not an electrial engineer
NigelGriff 6 months ago
@sw8741 CORRECT!
Snoep76239 6 months ago
cool
cpcoolman395 1 year ago