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Thanks, but this idea is used only in particular system. I want to design an electronic board which can be used in any three phase motor systems without any adjustment. I have known that there are many digitals relay can protect against phase-loss or unbalance phase. Do you know how it work...
To LaszloF,
"One of problems when phase loss that volage between phase to phase did not decrease because of inductance between three coils in the motor." That mean, when phase-loss occur the voltage phase to other did not decrease to zero. For eamples if phase X is opened, phase Y,X will induce...
Thanks for your suggestion, but i think this schematic is not completed.
If the three phase of motor is DELTA connected, it had not NULL phase. So you can not sense drop voltage between the phase and the NULL. One of problems when phase loss that volage between phase to phase did not decrease...
Hi Laszlof,
This schematic seem to be simple, but i don't know how it works. Please explain details. I want to use an microcontroller to sense phase angle then detect phase loss. Do you know any schematics?
download interfacing rs232 to pic16f877
You can use Visual Basic 6.0 to make GIU interface which is very simple. Firmware can be done by using USART module in PIC16F877. Good luck.
Hi cameo_2007,
I only want to protect a inductance motor from phase unbalance or phase loss. There are no devices in control board. Could you give me some advice or give me some reference schematic. Thanks
Hi everyone!
Please help me on this problem. I would like to design a circuit to protect three phase Ac motor from single-phasing condition. This circuit can detect one or two phase-loss then turn off motor immediately. Does anyone know this circuit? Please upload to this topic. Thanks.
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