Klockner Moeller Electric Parts from KlocknerMoeller.net
|
 |
Call Toll Free!
1-877-595-9616
|
|
Largest Authorized Stocking USA Distributor
Representing
|
| |
Circuit-breakers
as a transformer switch |
| |
Faults upstream of the low-voltage circuit-breaker, e.g. in the transformer itself, are disconnected by suitable protective
devices (e.g. a Buchholz relay) on the high-voltage side. The S7 auxiliary contact of the high-voltage circuit-breaker trips out the NZM
transformer switch on the low-voltage side in order to prevent feedback to the high-voltage network. S7 thus isolates the transformer from the
network on both sides. This interlocking with the high-voltage circuit-breaker must always be provided when transformers are being
operated in parallel.
If only one normally open contact is available as the auxiliary contact, an undervoltage release must be used instead of the shunt release. At
the same time, this provides protection against undervoltage. |
|