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Diagram/layout for 3 phase failure detector

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Famoshi

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Good day gents, I wouldn't mind if sm1 can help me with the schematic diagram for a 3 phase failure detector? I want to modify the one in my factory. Thanks.
 

KlausST

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Hi,

what "failure" do you want to detect?
* overvoltage
* undervoltage
* direction
* frequency
* some other?

Klaus
 

KlausST

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Hi,

80% ?

Klaus
 

chuckey

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If a three phase motor is running and it looses a phase, it will actually generate 90% of the phase voltage back onto its feed (see rotary phase converters). So to build a loss of phase detector for a single or multiple motors is difficult. If there is a considerable non motor load on the three phases (lighting and heating. . ) Then it the motor(s) ability to generate 90% of the line volts fails, so the voltage falls. However if the faulty 3 phase is not removed rapidly the motor overload circuits will kick in and trip the motors off.
Frank
 
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