relays.ppt

7/24/2019 relays.ppt

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Protective relays


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Relays classification

Regulating relays

Protective relays

Auxiliary relays Monitoring relays

Synchronism check relays


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Relays used in our project

Differential relay

Over current relay

ock out relay !"#$ Send receive relay !"%$


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Differential relay !"&$


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Over current relays

' (here are ) types

*nstantaneous !%+$

(ime delay !%,$


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ock out relay !"#$


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-hy lockout relay.....

-ithstand high current

*nterface

Make latch /igh speed


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-hat can "# do.....

"#

ockout relay

(rip coil *nitiate 0reaker failure 1lock close


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-hats *12


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-hat if 1,) not tripped


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-hat if 1,, not tripped


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-hen fault happen "& send signal

to "# 3 then "# can trip coil


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1ut 4hat if the coil not tripped.


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At the same time "# send signal to

%+ 3 the coil retripped


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*f the coil not retripped don5t Run

there is still a chance


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%+send a signal to #) !timer$ 4hich

send signal to another "#


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*f coil tripped %+ don5t sense current

so "# 12 not energi6ed


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1lock 7lose


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(rip circuit supervision


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Send receive relay !"%$


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Send receive relay !"%$


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/o4 does it 4ork


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1ut take care from 4rong

connection


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1y8 9P )+,)

(/: PRO(:7(ORS

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