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...
The maximum bridge temp is 95C, so no 60 is not too hot. The motors and drives are bothe oversized in order to provide overload capacity. The load has not changed, and neither has the current required. These drives are for a grate clinker cooler, and a cement kiln. There are identical drives...
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...
I agree that 60C is not out of bounds. My concern stems from the fact that these drives historically stayed below 30C for years. Voltage and current appear normal on the line side of the isolation transformer, on the drive side is where I took the stange readings posted. I'm assuming that there...
2 different drives are experiencing higher than normal bridge temps after a 6 month shutdown. Both are ABB DCS 500's. One is for a 40 hp motor, the other is for 2 75hp with the armatures in series. They are both way under FLA. Before the shutdown these drives both had bridge temps under 30C...
A kiln can over run once they have unbalanced rings built up also. I haven't had the chance to work with a modern AC kiln drive yet, just dual motor DC drives.
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...
I thought so also. I have some of the original prints of the bearing, but clearances are not listed. These bearings were built about 50 yrs ago and have been relined several times. Heres a picture of the good looking journal. I wish I would have taken a pic of the other one, and also the...
