Technical description
7 Application
7.1 Trip circuit supervision
VM55.EN005
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7.
Application
The following chapters illustrate the functions of the voltage
and frequency protection relays in different protection
applications
The device can be used for protection in distribution systems,
on transformers and for generators. Additionally it can be used
for sychrocheck or fast load shedding (e.g. loss of mains).
The relays provide circuit-breaker control functionality,
additional primary switching devices (earthing switches and
disconnector switches) can also be controlled from the relay
HMI or the control or SCADA/automation system.
Programmable logic functionality is also implemented in the
relay for various applications e.g interlockings schemes. For
details about the functionality in the relays see chapter 2.3 List
of protection functions.
7.1.
Trip circuit supervision
Trip circuit supervision is used to ensure that the wiring from
the protective device to a circuit-breaker is in order. This
circuit is unused most of the time, but when a protection device
detects a fault in the network, it is too late to notice that the
circuit-breaker cannot be tripped because of a broken trip
circuitry.
Also the closing circuit can be supervised, using the same
principle.
