Disconnector
Disconnection Unit for DEHNmid Surge Arresters
- Disconnects overloaded arresters from the supply
- Prevents potential earth faults
- Ensures faultless operation of medium-voltage systems
- Spark gap/thermal effect principle
- No ignition of a small explosive device
- Maintenance-free
Type
DIC 10: Disconnecting unit (disconnector) for all 10 kA medium-voltage arresters
Details
In medium-voltage systems, surge arresters are distributed throughout the whole system. Consequently, an overloaded arrester is hard to find and can therefore replacement cannot always be immediately made. The disconnector ensures safe disconnection of an overloaded surge arrester. Otherwise, a faulty arrester could form a permanent earth fault. Especially in solidly earthed systems, a faulty surge arrester prevents operation of the cable section affected if no disconnector is used. Therefore, the disconnector is an important component for trouble-free operation of a medium-voltage system.
The disconnector is series-connected with the DEHNmid surge arresters in its earth connection. This is especially important in conjunction with polymer-housed arresters, since their housing does not decay during a failure and black carbon and burn traces then form an earth fault.
One of the most common working principles of is the ignition of a small explosive device. This is difficult, particularly in daily use, for example storage, transport, etc. The disconnector from DEHN+SÖHNE is based on a spark gap/thermal effect principle and ensures safe disconnection without the typical disadvantages of an explosive device.
The disconnector is series-connected with the DEHNmid surge arresters in its earth connection. This is especially important in conjunction with polymer-housed arresters, since their housing does not decay during a failure and black carbon and burn traces then form an earth fault.
One of the most common working principles of is the ignition of a small explosive device. This is difficult, particularly in daily use, for example storage, transport, etc. The disconnector from DEHN+SÖHNE is based on a spark gap/thermal effect principle and ensures safe disconnection without the typical disadvantages of an explosive device.
