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I have existing Siemens relays in our switchgear. I've been asked to look at adding a touch screen to allow the electricians to open and close the breakers via the relays from afar, keeping them safe if something should go wrong. The relays have the 61850 protocal. In reading on the web it looks...

May I suggest asking your question on this web site. I use it often and I'm sure the answer you seek is there. http://www.plctalk.net

Should have mentioned it a high resistance grounded system. The 51GS is the ground fault on the feeder breaker. The ground fault will immediately notify the operators and electrical staff that we have a ground fault and we also start a timer if the problem is not corrected within that time...

A few have asked what we are doing and why. I have a couple of 15KV to 4160 subs we are looking at upgrading the relay along with adding a remote open/close feature. I think the subs are 20 to 25 years old. The relays 50/51, 51GS and 87T’s are no longer manufactured or supported. We are...

Sorry I did not provide the background story. The wet cells were changed out when we had a plant 10 year power outage (several years ago). The Gel cells batteries will not make it to the next power outage and taking down the substation is not an option. As part of the outage we also upgraded...

Appreciate all the replies.

A few years back we changed out our old wet cells batteries for the new Gel cells. Making a long story short we need to replace the Gel cells. I’m looking for guidance / procedures on how to safely change these one-line. Any help would be greatly appreciated.

As of now we have two camps on site, one side like the Siemens 7sj6's and the other camp likes SEL. We have few strays that like the Basler and other misc relays. I've been reading a thread on linkedin and was hoping this forum could provide some feedback...

Reliability, ease of use, drawout case, long term viability of the company, customer support, internal PLCs, wave form capture, comm protocals supported, self diagnostics... are few considerations I'm looking at.

We are looking at upgrading some protection relays. We are looking at SEL, Siemens, ABB, Eaton....... Trying to determine who is the best? Looking for feedback. Any help would be greatly appreciated.

End of life on electrical equipment. Looking for some feedback, opinions or any help on the end of life of electrical equipment (power distribution). Of course as equipment ages it becomes less reliable and I’m assuming less safe. With that in mind when do you start replacing equipment such as...

In looking at the osha std 1925.550(a)(15)(i), min clearance 10 ft power line. See 1910.333(c)(3)(iii)(A) I have the same 10 ft clearance, but in this case it spells out the clearance is needed if energized and exposed ie bare wire. It futhers states to provide insulation if you need to get...

Meggar 11.0 meg on all three phases.

Already looked at the coordination and I can increase it to 0.2 with out any problems. I don't have the test results for the breaker handy. I know its a new breaker and was tested when it was installed. Attached are some starts using a fluke. When checked the motor with our clamp on fluke...

I have a new chiller installation that will trip a SQD LX style breaker on ground fault. I does not do it every time and multiple megger readings indicates there are no problems with the equipment. I'm questioning the ground fault time delay (0.1). The way I understand how the GF works on...

Interesting discussion. Let me add a twist to the convesation. I have seen many of after market ground fault trip devices (AB 1409) used to drop out a contactor in the event of a fault. In these cases the contactor is working as fault clearning device (yes / no). Depending on the fault...

I feel kinda of stupid asking this question, but here goes. We recently sent one of our 4160V motors out to a repair shop. We typically have the motor run on a dyne after the repair. The motor shop told us the dyne was out but they test ran the motor on 480 Volt. When I first heard this I...

The caps are connected phase to phase. We tried to get current readings but our Dranetz unit has a bad input... currently (no pun intended) being repaired. Another piece of information I should have mentioned is the 4160V is on a high resistance ground system. I probably should have not...

Phase to Phase. We are feeding the motor starter with a contactor that is approx. 1000 ft. Note the feed contactor stay energized all the time. The caps for the motor come directly off the motor stater (vac bottles) and the motor feeder is approx. 50 foot long. The waveforms are of a motor...

I'm looking at some wave forms of a 4160V, 600 HP, 1200 RPM motor with 175 Kvar Caps. I'm montoring the line side of the motor starter, most of the wave forms look like I'm seeing a ringing form the caps. How ever look at the start on 12_16-2008. No too sure what I'm seeing here. Any help would...