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Author Topic: Strange power situation  (Read 1671 times)

Rob Spence

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Re: Strange power situation
« Reply #20 on: September 20, 2019, 04:47:51 pm »

The strangest power thing I ever encountered was all human caused.

Brand new engineering building for a computer company. My role was network manager and manager of the group of computer system managers.

Town power was 25kv. Power transformers were ordered. Pretty big power. Two substations I think. 4 labs with 10 each 100a 3 phase overhead bus bars. Oh, and the building and lights etc too.

Transformers arrived, they hooked them up and turned on the power. Blew up every connected device. I only cared about the freight elevators but...

The manufacturer assumed that the 25kv really meant 13.8kv which is a very common street voltage, so they built for that.

The manufacturer didnít check with the customer

The electricians had loads connected when they turned on the mains

The electricians didnít meter things before turning on the mains.

Me, we had to lay plywood across mud and use lift gate trucks to move in the first dozen mainframes instead of using the loading dock and elevators.

Two years later the adjoining building was built. 4 substations this time. I had one computer room that was 100í x 300í with a pair of 100a bus bars every 10í plus lots of cooling.

This time the switch gear had meters. Good thing. The 480v bus read 600v. They blew it a second time but fortunately did not connect the building. Whew. The PoCo dropped a big ass transformer outside and patched it in while we waited for replacement transformers.

Sigh...

Edit : fix the bus
« Last Edit: September 20, 2019, 09:52:09 pm by Rob Spence »
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rob at lynxaudioservices dot com

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John Roberts {JR}

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Re: Strange power situation
« Reply #21 on: September 20, 2019, 06:55:06 pm »

bus,,,,  buss sells fuses.

JR
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Don't tune your drums half-ass. Listen to what a properly "cleared" drum sounds like.   http://circularscience.com/

Rob Spence

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Re: Strange power situation
« Reply #22 on: September 20, 2019, 09:48:44 pm »

bus,,,,  buss sells fuses.

JR

Oops, I need a drink 😁
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rob at lynxaudioservices dot com

Dealer for: AKG, Allen & Heath, Ashley, Astatic, Audix, Blue Microphones, CAD, Chauvet, Community, Countryman, Crown, DBX, Electro-Voice, FBT, Furman, Heil, Horizon, Intellistage, JBL, Lab Gruppen, Mid Atlantic, On Stage Stands, Pelican, Peterson Tuners, Presonus, ProCo, QSC, Radial, RCF, Sennheiser, Shure, SKB, Soundcraft, TC Electronics, Telex, Whirlwind and others

Jeff Bankston

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Re: Strange power situation
« Reply #23 on: September 21, 2019, 12:51:16 am »

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John Roberts {JR}

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Re: Strange power situation
« Reply #24 on: September 21, 2019, 09:13:39 am »

buss ? I rode a buss.

https://www.youtube.com/watch?v=tZkouut-9RQ
even wierd Al spelled it right...

you can buss your girlfriend...

JR

@Rob no worries , I spelled it wrong before the early/mid 80s....
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Don't tune your drums half-ass. Listen to what a properly "cleared" drum sounds like.   http://circularscience.com/

Jeff Bankston

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Re: Strange power situation
« Reply #25 on: September 22, 2019, 01:01:50 am »

even wierd Al spelled it right...

you can buss your girlfriend...

JR

@Rob no worries , I spelled it wrong before the early/mid 80s....
lol ! I spelled it buss on purpose. I was wonderin if anyone would catch that. Excuse me while I catch the bus.

http://www.youtube.com/watch?v=h0PlwVPbM5k


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Kevin Graf

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Re: Strange power situation
« Reply #26 on: September 22, 2019, 08:54:03 am »

A guy on a job wired up a new 75kva 120/208 3 phase transformer. A guy checking new outlets was getting 196 volts between hot and neutral. I pulled the transformer cover and neither the cold water ground or the ground rod was connected to the XO lug. I connected them and everything was alright alright. An electrician has got to connect with the XO. Has anyone seen the XO ?
Connecting to Planet Earth is not the correct solution for a voltage mis-wire problem.
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Speedskater

ProSoundWeb Community

Re: Strange power situation
¬ę Reply #26 on: September 22, 2019, 08:54:03 am ¬Ľ


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