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...
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.
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...
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...
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...
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...
Looking for some feed back on why you would spec out a DC coil or AC coil on a large motor starter (size 5 or 6). I'm old school and back in my day we used DC to avoid vibrational issues associated with AC coil. Don't know if this is still a valid consideration or not. Your opinons will be...
Any requirements to periodicaly test static conductive hoses? Wonder what other plant are doing. We currently have a yearly PM to test the conductivity of the hoses, is any one else performing a simular task? Any help would be greatly appreciated
I have 4160v motors that are fed with amored cable. My question is about unwiring the motor. Is it necessary to install personal protective safety ground to unwire the motor? I've heard two different stories.
1. Always ground
2. No need to ground since the armored cable prevent any...
