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...
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...
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...
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...
