Shunt Release Trip Problem

Have you talked to the equipment manufacturer yet?

Thanks JRaef, I am very much satisfied with your answer,

actly I bought this system to protect my home appliances ( T.V., fridge, inverter etc.) from high voltage damage from 16 kv transformer three phaze 240v connection which is causing damage even if equipment is off.

Is there any other way for high voltage protection.

P.S. I am living in farm house, very far from city, so I have to manage every thing myself.

If I were you, I'd get on to the local utility supplier and get them to sort out all their neutral links so that high voltages don't happen any more, and claim on their indemnity insurance if they still do. It shouldn't be up to the householder to install any more equipment than is in use elsewhere on the network!

"You have a phase monitor relay (MG73BH). It has an "adjustable operate time", although for the life of me, I cannot figure out what the freaking manual says about how that adjusts. So it might be adjustable from 0-15 seconds, or it might be fixed at 5 seconds, it's just completely foggy. Very inadequate descriptive information in my opinion."

I see what you mean.

There are three relays in the range. The MG73B9 & MG73BH the on delay is adjustable, 0→15m & 0→15s respectively, off delay fixed at 5s. The MG73BF the on delay fixed at 5s, the off delay is adjustable 0→15s.

I'm glad this has cropped up, I was looking to use one. Whichever I chose I would have been snookered one way or the other.

It'll teach me to RTFM first!

So is this damage being caused by sustained high voltage, or high voltage spikes? Have you been able to document it either way? Because the sustained high voltage is, to Crabtree's point, the responsibility of your serving utility so they should find the reason and correct it. Spikes however are something they will, in my experience, vehemently deny, deny, deny, until you hand them documentation showing it, then they end up telling you it can't be helped anyway and you need to deal with it yourself (so don't waste your time).

That sounds like the US utilities are as good as their UK equivalent, the DNO's.

Whatever the problem, it's nothing to do with them. I've caught them out a couple of times but it was hard work.
Last time was voltage fluctuations, they couldn't argue with 28 days of recorded data. They finally admitted they had a problem with a 33/11KV transformer tap changer. I told them that before the argument started.

add a on delay timer ( preferable delay 1 to 2 sec) between monitoring device and shunt trip coil.

Anand

thanks Anand, I was thinking the same way and I hope it should work, except in one condition when lights go off and comes again with high voltage then no protection for high voltage is available.

Use an on-delay timer at the o/p of the SM500...if u can give me an email id ..I shall send u the circuit diagram

give a thought to using the undervoltage release while designing your system instead of using the shunt release . . . .