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hemk2013
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Join Date: Dec 2013
Posts: 1

33 KV/ 110 V Solar Power Station Question

12/11/2013 8:56 AM

Sir, In our Solar power station, The Potential transformers are failing ( damaging/ blasting) frequently. Can you suggest the cause of failure.
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Pathfinder Tags: 33 KV/ 110 V PT failures
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RAMConsult
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#1

Re: 33 KV/ 110 V Solar Power Station Question

12/11/2013 10:27 AM

Actually many causes; unfused/unprotected PTs, overvoltage from output of inverters, total lack of coordination of PV array output with inverter control/protection circuitry (or lack thereof), etc. A total review of the electrical systems is required to remediate the situation and prevent future recurrences.

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PWSlack
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#2

Re: 33 KV/ 110 V Solar Power Station Question

12/11/2013 1:23 PM

Some combination of:

  • Incorrect specification
  • Incorrect construction
  • Incorrect operation
  • Incorrect maintenance

Without reviewing the design, construction, operation and maintenance documents it is difficult to say more.

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lyn
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#3

Re: 33 KV/ 110 V Solar Power Station Question

12/11/2013 1:48 PM

Is your self destructing power station located in a country that has any code, safety, insurance coverage or other controls on how the station was constructed and does it have any restrictions or requirements on the qualifications for those presently operating the station?
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SolarEagle
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#4

Re: 33 KV/ 110 V Solar Power Station Question

12/11/2013 2:27 PM

Improper grounding....

I would review the system as a whole for spec guidelines....The inverter(s) and transformer relationship together with proper wire size and grounding requirements, can be challenging....The environmental conditions can also be a contributing factor....Proper maintenance is also important...

http://www.electrical4u.com/external-and-internal-faults-in-transformer/

http://www.control.com/thread/1281076079

http://www.wecc.biz/committees/StandingCommittees/PCC/TSS/MVWG/REMTF/Solar%20Documents/WECC%20PV%20Plant%20Power%20Flow%20Modeling%20Guidelines%20-%20August%202010.pdf

http://www05.abb.com/global/scot/scot271.nsf/veritydisplay/c3791bac5b25bd10c1257ab80037553b/$file/ABB%20SR%20Transformers-121031.pdf

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Fredski
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#5

Re: 33 KV/ 110 V Solar Power Station Question

12/11/2013 2:42 PM

incompetency
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lyn
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#6
In reply to #5

Re: 33 KV/ 110 V Solar Power Station Question

12/11/2013 4:29 PM

I'd say that sums it up, in a word!

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Barchetta
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#7

Re: 33 KV/ 110 V Solar Power Station Question

12/11/2013 9:57 PM

High voltage on cold sunny days.

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olehwi
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#8

Re: 33 KV/ 110 V Solar Power Station Question

12/11/2013 10:50 PM

No one can answer your question - you are not providing sufficient information. You MUST at least provide a single line diagram of what it is you have and how it is connected. . . . Short - NO diagram - NO comment.
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brich
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#9

Re: 33 KV/ 110 V Solar Power Station Question

12/12/2013 1:56 AM

to much sun or sand or both!

And the next daft question please!

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SHOCKHISCAN
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#10

Re: 33 KV/ 110 V Solar Power Station Question

12/12/2013 9:27 AM

Overvoltage that exceeds the PT design rating/limitations.

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4wsilver
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#11

Re: 33 KV/ 110 V Solar Power Station Question

12/12/2013 11:40 AM

You don't even state what the Potential transformers are monitoring. Whether they are protected against transients (lightning or static) Too big a question, not enough details.
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jack of all trades
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#12

Re: 33 KV/ 110 V Solar Power Station Question

12/12/2013 1:27 PM

The Potential transformers are failing ( damaging/ blasting) frequently

What, are you making insulators out of C4?

As per a previous recent question on CR4 it sounds like it could be over voltage events. Best you get someone in to diagnose and fix the problem.

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Users who posted comments:

4wsilver (1); Barchetta (1); brich (1); Fredski (1); jack of all trades (1); lyn (2); olehwi (1); PWSlack (1); RAMConsult (1); SHOCKHISCAN (1); SolarEagle (1)

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