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Join Date: Dec 2011
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Stability Test

12/12/2011 5:51 AM

how to do stability test for auto transformer 300 MVA 500/220/33 kv

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Guru
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#1

Re: stability test

12/12/2011 6:06 AM

What does it say about it in the user manual that came with the equipment?

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Guru
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#2

Re: stability test

12/12/2011 6:31 AM

Tiptoe away silently.

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#3

Re: stability test

12/12/2011 7:27 AM
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#4

Re: Stability Test

12/12/2011 9:49 AM

Is this just for interest or study?

If not and you have to ask the question I doubt your qualified to be doing such tests.

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#6
In reply to #4

Re: Stability Test

12/21/2011 3:24 AM

for studay , and I'm realy need to now becouse I have to do this for Auto transformer 500/22/33 KV 300 MVA and the percentage impedance is 16.51 %

I do stabilty for differential by appling 415V at H.V side and M.V side shorted Inside and out side differential zone .

now I ask for restricted earth fault

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Guru
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#5

Re: Stability Test

12/12/2011 7:22 PM

I just searched the "J P Transformer Book" and the "Electrical Transmission Reference Book" and could not find any entries for an electrical "Stability Test" of Power Transformers (there were entries for the mechanical and chemical stability of the materials used in the their construction though).

Are you referring to the stability of differential protection schemes for power transformers with some form of LTC (Load Tap Changing)? Perhaps you could elaborate on what this test is for,

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Guru
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#7

Re: Stability Test

12/21/2011 2:23 PM

I'm surprised that post #6 by naro was flagged as Off Topic when in fact it is the positive response to post #5; i.e., he is trying to perform a stability test of his differential relaying protective scheme.

This test ensures that the relaying is stable under normal operating conditions inside the zone such as tap-changing under load and does not cause a trip for any disturbance outside its zone of protection. What's really being tested is the uniformity of response of the CTs to the varying current due to where they are on their operating curves as well as the trip-window of the differential relay.

He should consult with the supplier of his protection system for guidance.

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lyn (1); naro (1); PWSlack (1); RAMConsult (2); TonyS (1); Tornado (1)

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