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MOTOR PROTECTION (PHASE) AND PHASE
QUE RELAYS
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Mostly the
elektric motor is failured due to 2 phase thet
caused over warning up in the industrial plants. The
mainly usage of thermic magnetic relay for the
protection of elektric motors that due to
elektromechanic body and high current needs for the
spending demurrage current, caused that unsufficient
protection of the motors. So designed to stop the
unsufficiency of the relays, the new type of
protection relay manufactured below mentioned main
features.
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I. Phase Cut Off : In case of one
phase cut off, the motor to be stopped by the relay.
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II. Phase Que : In case of phase gue is
contrary (R,S,T anti clockwise) motor not to be
started by the relay. In any case the motor phase
que changed, the motor stops immidiately.
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III. PTC Protection : Motor reel
temperature increased the value more than PTC value,
the relay stops the motor immidiately.
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IV. Voltage Unstability(not adjustable) : The
unstability between the phase voltage more then %20,
the output relay is disconnected the motor in 3 sec.
the unstability voltage (asimetric) an the 3
phase systems becames via the unstable load
connections to the phases. And it causes that
increasing the reel temperature and lowering the
motor power simontenously.
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V. Voltage Unstability (adjustable) : The
output relay is contacted if voltage unstability
between the phases value lower than the adjusted
asimetric value by the operator. In case of the
voltage unstability value is more than %5-25 the
adjusted value, the output relay disconnected right
after 3 sec. delay, so the motor stops running. If
the asimetric error, becaming the less period of the
fixed time delay, the output relay is stand
contacted and motor keeps running. As a result it
can not be affected sudden waves of the feeding
voltage.
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