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I worked in a GIS station that took in 138kV UG cables. The cables came in in the basement and were on cable trays while they made their way to the GIS, about 100' or so before they went up on risers to the gear. This is a permanent configuration.

Imagine the PLC protection, then a fault occurs, then PLC fails to trip. Someone or something very expensive gets hurt. Investigation finds faulty PLC as root cause.

The correct answer is always consult the manufacturer for latest maintenance recommendations. Other less correct answers might be GE Red / Mobile 28 or Anderol 757 for moving parts in the mechanism. Never WD-40. Auto parts store lubricants should be avoided. The attached paper, discusses HV...

Is that a typo? 120MW? Nope. And I heard from the TSO this week that in the final configuration they are planning on 3600MW. Yes, 3.6 Giga Watts! Enough to send 3 DeLorean's back to the future! My limited understanding is that AI data centers use 3-4 times the electricity that a...

In three different states, I've seen 3 different set ups for VRLA batteries in a brand new substation control house. #1 - No special monitoring equipment. #2 - Batteries in containment with a garage door like set up with monitoring. #3- Full blown battery monitoring and fire suppression...

Data storage, I don't know. AI Data centers....We have one being built in our footprint. Phase I & II are being built to handle 1200MW continuous, with more to come.

This paper describes a Basler Diode monitor https://docs.ips.us/docs/W1002340.pdf

This is the manual from a GE Sync motor controller that goes though it a bit. https://sertecrelays.net/wp-content/uploads/2019/02/spmman.pdf

We have several thousand distribution subs in our system. Feeder protection is either CO's or SEL. We started putting SEL 251's in the early/mid 90's, now we use 351A's. I don't recall every seeing resistors on any of our PT circuits, nor do I recall any issues with our Y-Y PT's. Nearly all...

A Cigre report found that 41% of transformer failures were due to OLTC. If you don't need it, don't spend the extra money or add extra risk.

Check for CT shorting screws (or shorting devices) still installed on a terminal block that feeds the power meter. New equipment is generally shipped with shorting devices in place and need to be removed once the circuit is complete.

We had an open CT on our system a few years back. It was a ring bus, dead tank breakers, with the CT's paralleled in the control house, then feeding a digital distance relay. It took about a month for the problem to show. The overvoltage caused the relay magnetics board transformer to flash...

That should be possible with the correct protocol licenses and perhaps some protocol conversion. Our generation group has standardized on Emerson Ovation DCS and is currently in the process of integrating within the fleet. One plant for example is GE and uses GE DCS. As of now, we integrate...

I've worked in several GIS stations in our footprint, as well as other utilities. 1- Most GIS I've seen has been indoors. Some buildings have the transformers indoors with suitable fire suppression. I was at a 345 GIS station last fall that was about 40 years old. Built in the middle of...

Are the CT's shorted at the terminal block?

Carried out dc dielectric test for a 33KV XLPE You should really be using AC VLF for XLPE cable.

Eu experimentei algo semelhante. Você pode tentar (se for absolutamente necessário que funcione agora) abri-lo e pressioná-lo com alguma força para encaixar as placas de circuito.

IN North America, the ABB/Westinghouse FT test switch is very popular for a variety of reasons, including that it's the same mechanism that was used on the electrotechnical relays of the past. The FT switch has a companion test paddle (separate source) that many relay techs carry several at all...

Follow up: The black VT's (incoming line) were rewired on the primary and secondary sides and connected to a single relay. I had my phase angle meter (and battery), and it was then determined that Va and Ic, Vb & Ib and Vc and Ia seem to match. The currents were wired from a terminal block...

I'm headed back to the site tomorrow. In the mean time, just for everyone's entertainment, I got a call today from the plant...blaming me for not being able to sync one of their turbines. I politely explained I hadn't touched anything and the VT's I was investigating were on bus 2 and the...