MVAJ205 Protective relays are precise measuring devices

Description

MVAJ205 Protective relays are precise measuring devices

Protective relays are precise measuring devices, the contacts of which should not be
expected to switch large electrical loads.
In some cases, the protective relay can trip a circuit- breaker directly, or according to the
coil rating and the number of circuits to be energised.
The MVAJ relay interfaces with the protection to provide: higher contact capacity,
additional contacts for tripping multiple circuit-breakers, control functions, signalling and
interlocking.
The MVAJ range comprises very reliable hinged armature relays designed to directly
operate circuit-breaker trip coils. Built to very high specifications, the MVAJ range provides
a highly flexible and reliable link between the protective relays and the circuit-breakers.
Models Available

Trip relays
Trip relays possess a standard hand-reset flag and operate within 10 ms.
Table 1 shows the trip relay versions available

Control relays
Control relay variants of each trip relay are available. These relays operate within
approximately 15 ms

All relays configured for high burden applications are suitable for DC operation only

MVAJ23T1GB0774B

Type MVAJ 102 relay is specifically designed for applications
requiring a tripping relay which is self-resetting after a nominal
delay of 2.5 seconds. This relay may be used, for example, for
inter-tripping between higher voltage and low voltage circuitbreakers of a large 3-phase power transformer.
This may become necessary when the high voltage circuitbreaker is tripped after a heavy internal fault by protection
which cannot conveniently provide an auxiliary contact with a
dwell time long enough to ensure correct tripping of the low
voltage circuit-breaker.
Typically, the relay is initiated by transformer protection, such as
overall protection, restricted earth fault and Bucholz relays, in
arrangements where both the HV and LV circuit-breakers are to
be tripped simultaneously.
The HV breaker may be expected to trip more quickly than the LV
breaker so the tripping signal is maintained by the delayed reset.
This ensures complete clearance by the LV circuit-breaker, even
though the fault may have been cleared largely by the HV breaker
and the protection has started to reset.

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