Thats good to know. I had thought that primary was the only way to test all the components, but that there was a risk of damage to the breaker. We're going to go through about 20 breakers of so, so it will be a good job. Contractor will be doing the testing, we'll be doing the lifting and the...
Insurance company wants us to test all of our unit substation secondary breakers. They all GE AK breakers 600 and 1200A. They have all been retrofitted with AC Pro trip units within the last 10yrs.
Should we use primary or secondary injection for the tests. I don't think primary is a good...
We installed the batteries today without any problems. Tommorow we will connect them to the charger and let the charge for 72hrs. After that a load test, and we can hook them back up to the swgr. I believe the instructions said that the Lead/Calcium didn't need to be equalized, and also that the...
Thanks, that's what I was thinking. I've gone through the literature, and have the specs just wanted to hear that its common. Under what circumstance would you purposely omit a cell or two? I would guess if you were going to have to equalize online that might put the voltage a little high. I'm...
I'm installing a new battery next week in our main substation, and wanted some advice. Load will be 12 GE magneblast breakers. Nominal voltage is 125, closing coil is 90-130 95A and the trip coilis 70-140 6A. The system I'm replacing consisted of 54 cells but looking at the PO 60 were purchased...
That's something we can look at in the future, but the old GE relays we use are still working without any trouble. I'd just hate to have an incident due to no policies regarding the big breakers.
We use electromechanical relays also, and I agree that its important to see if it was time or instantaneous, and especially ground. I'd just hate to see someone hurt, or for the plant to be damaged beyond repair.
If I had the authority I would. I'm just the guy who has to come out and fix the problem after the smoke has settled. Management seems open to suggestions about some type of policy to replace the lack of one, and I'd like some input on how it's done elsewhere.
As the subject says, production resets the relays without any thought about a downstream fault. This is on 4.16 GE switchgear from the 50's. Faults are uncommon, but when there is one the relays are reset, and the breakers are closed several times before an electrician is called. We don't have...
Your original post is exactly how we do our ground testing at our facility. We start at the utilities substation and perform a fall of potential. I believe that you furthest stake is supposed to be some multiple of the total length of the grid. If your facility is built on one big interconnected...
I have the manual, but the section on burdens for the tripping coil really threw me off. After looking more closely at the manual, I came across the details for calculating the tap setting using the ratio of the ct. That was what I was looking for, I just looked a little too hard. I should have...
I'm having a hard time grasping the tap settings on these relays. Is there a simple explanation for setting them up properly. I'm not looking at making any changes, just wanting to understand how to select the proper taps.
I don't see why it would be considered 3rd world. We don't have the luxury of ordering a whole new switchgear, and I think that inspecting and trying to repair is better than doing nothing. 3rd world would be filling it with roofing tar, and wrapping it with 33. How would you fix this problem...
Definately not a retrofit. No vacuum bottles either. I was refering to the porcelain insulators containing the primary disconnects. I guess the look like "bottles". We recieved the Raychem HVIS for the bolted joints, and also their HV heat shrink tape for the bars themselves. The torch they...
