Issue in remote control of three phase pump

[premkumar9]

Hi,
I do the remote ON/OFF of a three phase pump. One problem is that if any one phase is not available, the pump protector trips and somebody has to rest manually. So I am thinking of adding a circuit which can prevent switching on the pump if all phases are not available. My questions are
1) Is there protectors available which will rest automatically when all phase voltages resumes?
2)I am thinking of checking of three phase with transformers, comparator and logic circuit and switching a relay to control the pump (prevent pumping when any phase is missing and permit pump control when all phases are there). Is there any other simpler method?

 

[crutschow]

They do make phase monitoring relays such as this which should do what you want.

 

[sahu]

Hi,
I do the remote ON/OFF of a three phase pump. One problem is that if any one phase is not available, the pump protector trips and somebody has to rest manually. So I am thinking of adding a circuit which can prevent switching on the pump if all phases are not available. My questions are
1) Is there protectors available which will rest automatically when all phase voltages resumes?
2)I am thinking of checking of three phase with transformers, comparator and logic circuit and switching a relay to control the pump (prevent pumping when any phase is missing and permit pump control when all phases are there). Is there any other simpler method?

post Ur sch hear

 

[premkumar9]

They do make phase monitoring relays such as this which should do what you want.

Thank you very much. I was not aware that this type of relays are readily available. Now I will try to locate and get them here.

 

[Diver300]

Welcome to RS Online

RS in India offer a range of phase loss relays. They all seem to be stocked in the UK, but RS will ship them to India and charge in Rupees.

 

[KeepItSimpleStupid]

I've used these SymCom, or similar, with excellent results. We needed adjustible overvoltage, and variable reset time. Some have been in place for 20+ years or so.