The area of application for the relay/transformer
combination ranges – depending on the standards involved – from
personnel protection to fire prevention to general protection of systems
for 1 to 4-pole electrical power networks.
There are three different relay types and seven different transformer
types available. They cover operating currents ranging from 1 to 1800 A.
The three relay types are:
- Rated fault current 30 mA, permanently set
- Rated fault current 300 mA, permanently set
- Rated fault current from 30 mA to 5 A and a delay time from 20
ms to 5 s which is variable in stages.
The fault current relay indicates when a fault current has exceeded the
predefined fault current by using a changeover contact. The contact
signal can be processed further as a signal in programmable logic
controllers or can initiate a trip via the undervoltage release of a
circuit-breaker/switch-disconnector. The compact ring-type transformer
is placed without any particular space requirement at a suitable
position in the power chain.
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