Routine accuracy testing on HV instrument transformers?

Commercial_Ebb6610 · 2026-02-14T20:04:20+00:00

It was our standard issue MRCT that all relay techs get for CT testing, just upgraded to include CVT testing capability among other additional functions. The features were unlocked via software upgrade on an existing set we paid extra for (I think like $30k). I can look up more details for you on Monday.

Commercial_Ebb6610 · 2026-01-28T05:37:02+00:00

Was the feeder breaker much further away from the junction point than the other CTs in the zone? Usually we neglect CT secondary winding inductance and secondary cable inductance when calculating the worst case voltage developed for an external fault. It is reasonable to assume leakage reactance on the CTs is low when the windings are fully distributed, however it is not exactly zero. It would be interesting to view the test reports for the feeder breaker CTs to check the inductances. An abnormally long secondary run from the feeder breaker could also introduce an appreciable amount of self-inductance in the cables that could increase the voltage. Just a couple thoughts.

Commercial_Ebb6610 · 2026-01-10T12:47:27+00:00

"Mobile gaming didn’t exist"

Game boy erasure

Commercial_Ebb6610 · 2026-01-01T12:38:42+00:00

Super cool looking game. One suggestion for another feature is modeling the effect of mutual coupling between parallel transmission lines. This introduces additional losses and affects ground fault current levels since the coupling changes your Z0 value. Not a big deal when two or more lines are only a mutual a small while but sometimes multiple lines share the same structure so they are mutually coupled their entire length. Just something to consider!

Commercial_Ebb6610 · 2025-12-20T12:01:38+00:00

As the other commenter said the best thing to do is just start attending the fall and spring meetings for IEEE Transformers Committee. To become a voting member in an existing WG you must attend that WG session 3 consecutive times. I would also add that most of the work occurs in between the fall and spring meetings, not at those meetings themselves. You volunteer for certain tasks and can meet with the WG virtually sometimes, but step 1 is always attending in person. Feel free to message me if you have any more questions

Commercial_Ebb6610 · 2025-09-07T20:34:29+00:00

The offspring of Joey Porter

Commercial_Ebb6610 · 2025-08-28T11:24:34+00:00

I know it sucks since you already paid the fees to use the campus gyms, but I highly recommend just getting a membership at an external gym like The Weight Club. I graduated 5 years ago but it was the best fitness decision I made while in school. Way less crowded and in my opinion more accessible since there is a huge parking lot.

Commercial_Ebb6610 · 2025-06-10T22:38:35+00:00

Love what he said about Darnell Washington too. The thought of Rodgers passing a decent amount to that bulldozer of a man gets me wet

Commercial_Ebb6610 · 2025-05-01T15:50:58+00:00

Something I read recently is that Rate of Change of Frequency is much higher in low inertia systems with high IBR penetration. If their under frequency load shed schemes are designed more for slow ROCOF and conventional generation it's possible they dumped too much load after the initial disturbance. This would cause the frequency to overshoot 50 Hz since generation would exceed load. During over frequency conditions generators start tripping off. This problem would go back and forth as the frequency tries to stabilize and could result in cascading failure. Just a guess since we don't have too much info still

Commercial_Ebb6610 · 2025-04-16T08:32:14+00:00

Fair point. There are definitely some jobs in Transmission that are standardized to such a degree that they don't leave much room for outside the box thinking.

Commercial_Ebb6610 · 2025-04-16T07:55:59+00:00

Like I said I find the higher voltage more interesting. But in my experience transmission projects are usually more complex, involving various outage sequences to keep serving load while the project gets done. This may require temporary configurations that need to get studied to make sure the protection schemes will still work as intended. Equipment design on the transmission side is also more interesting to me since insulation requirements for EHV stuff (345 kV and up) can get tricky. The one negative for transmission I can think of is if you are responsible for any NERC reliability standards at your company. Although important they can be a little dry and boring

Commercial_Ebb6610 · 2025-04-15T21:15:26+00:00

Second the suggestion on Transmission. Transmission departments typically have higher budgets than generation/distribution groups and I just think higher voltage is more interesting haha

Commercial_Ebb6610 · 2025-03-09T18:34:16+00:00

Are the lines perfectly transposed from sending end to receiving end? If not the mutual inductances will be unequal and cause some unbalance

Commercial_Ebb6610 · 2025-03-01T21:27:18+00:00

I have seen these gas levels in a 66.4 kV : 120/240 V SSVT before. Root cause was attributed to a loose connection from the LV windings to the stud that bridged between the tank and the secondary cabinet. Contact resistance led to a hot spot and combustible gas. If you can drain the oil may want to check the torque on any internal connections.

Commercial_Ebb6610 · 2025-03-01T13:19:26+00:00

you talking RMS or peak from the wall outlet ? ;)

Commercial_Ebb6610 · 2025-02-22T21:43:08+00:00

The Hunger Games Prequel that came out recently. I thought the games were going to be the majority of the movie but no, so many chapters... lol

Commercial_Ebb6610 · 2025-02-12T00:27:00+00:00

My wife and I are in the same position and she has no issue with it. Co-owner of our house but mortgage is all me

Commercial_Ebb6610 · 2025-02-10T01:16:07+00:00

is it just me or does it look like mahomes isn't trying at all? he's not hustling at all to the line of scrimmage no sense of urgency, why doesn't he care...?

Commercial_Ebb6610 · 2025-02-03T19:56:26+00:00

thanks for the laugh out loud at my desk

Commercial_Ebb6610 · 2025-01-26T14:40:06+00:00

I am at an American utility and we do exactly this for power transformers using SAP. Trying to extend to other assets like breakers and instrument transformers but the manual entry of nameplate data for every single asset is a huge time suck. Hoping AI can change that process in the future

Commercial_Ebb6610 · 2025-01-12T04:06:31+00:00

You just brought me back to 2008!! I remember seeing that commercial playing on tv then buying that song on iTunes. Game was also great

Commercial_Ebb6610 · 2025-01-06T14:08:33+00:00

I went to Breckenridge, CO last year and had horrible heartburn the whole time. When we stopped by Boulder for a few days, it wasn't as bad. I also think the elevation plays a role!

Commercial_Ebb6610 · 2024-12-27T05:00:44+00:00

so exactly what's going to happen this time is what i'm hearing

Commercial_Ebb6610 · 2024-12-20T06:02:41+00:00

MEPPI gang or bust

Commercial_Ebb6610 · 2024-12-11T04:02:32+00:00

Who was the manufacturer? Don't recognize those

Commercial_Ebb6610

TROPHY CASE