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MVAJ205  Tripping and control relays

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 may trip a circuit breaker directly, or according to the coil rating and the number of circuits to be energised, may do so using a MVAJ tripping relay. The MVAJ relay interfaces the protection relay with the circuit breaker to provide the higher contact capacity, additional contacts for tripping multiple circuit breakers, control functions, signalling and interlocking.
The MVAJ range comprises highly 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.

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Description

Overview

Essential details：MVAJ205  Tripping and control relays

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 may trip a circuit breaker directly, or according to the coil rating and the number of circuits to be energised, may do so using a MVAJ tripping relay. The MVAJ relay interfaces the protection relay with the circuit breaker to provide the higher contact capacity, additional contacts for tripping multiple circuit breakers, control functions, signalling and interlocking.
The MVAJ range comprises highly 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.

Features
• Directly operates circuit breaker trip coils
• High reliability
• High speed operation
• Negligible contact bounce
• 10 contacts in Midos size 2 case
• Supplied as high burden
• Low burden selectable by removing an external link
• Hand, electrical, hand or electrical and self reset versions
• Reset inhibition feature
• Immunity to wiring capacitance discharge
• Delayed cut-off available in high burden applications
• AC or DC operation for low burden configuration
• 2.5 second time delay

MVAJ205 

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sunny  He

[Email] sales@xiongbagk.cn

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MVAJ205  Tripping and control relays

Where reguired, multiple operate linesmay be used to drive a single MVAJ triprelay. In these cases MCAA relays may beconnecled in series with each of theoperate lines lo indicate which line causedthe trip condifion.
Type MVAJ 102 and 202 relays havebeen specifically designed for applicalionsrequiring a tripping relay which is self.reseting after a nominal delay of 2.5
seconds.
This relay may be used, for example, forinter-tripping between higher voltage andlower voltage circuit breakers of a largethree phase power translormer. This maybecome necessary when the higher vollagcircuit breaker is tripped afer a heavyinternal fault, by protection which cannotconvenienily provide an auxiliary conlactwith a dwell time long enough to ensurecorrect tripping of the lower voliage circuitbreaker.
Typically, the relay is initiated bytranslormer proteclion, such as overalldifferential, restricted earth fault and
Buchholz relays, in arrangements whereboth the Hy and LV circuit breakers are tobe tripped simultaneously.
The HV breaker may be expected to tripmore quickly than the lV breaker so thetripping signal is maintained by thedelayed reset. This ensures completeclearance by the LY circuit breaker, eventhough the fault may have been clearedlargely by the HV breaker and theproleclion has slarted to reset.

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