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Anonymous Poster

Routine Tests for Transformers

06/23/2010 5:14 AM

Please I need to know what is the routine tests to do for Power transformer??
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Ali18
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Join Date: May 2008
Posts: 136
Good Answers: 2
#1

Re: T R for transformer?

06/23/2010 6:00 AM

Hi guest!!

as far as I know from my work, there're many tests need to be made from time to time on power transformers such as *Measurement of winding resistance using (Migger).*Measurement of voltage ratio and check of phase displacement.* measurement of short-circuit impedance which is determined by measuring the primary voltage necessary to full-load current with the secondary terminals are shorted together.* measurement of no-load loss and magnetizing current at rated voltage & frequency. Keep in mind this test is measured on one set of windings, but the other windings open-circuited.* also there is particular tests like the applied voltage test which verifies the health of the winding insulation to earth and between the windings, also there's the induced voltage test that makes sure of the insulation between turns & between wendings.

I hope this helps.

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PeterT
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Join Date: May 2010
Location: Liverpool, NY
Posts: 961
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#2

Re: Routine Tests for Transformers

06/23/2010 10:52 AM

Depending on whether this is a new transformer being commissioned for the first time or an in-service transformer being maintained & tested, get the ANSI / InterNational Electrical Testing Association (NETA) Acceptance Testing Specification 2009 or the Maintenance Testing Specification 2007. Go to link:

http://www.netaworld.org/

These specs give the recommended and optional tests for electrical apparatus including power transformers.

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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#3

Re: Routine Tests for Transformers

06/24/2010 4:16 AM

Those that are stated on the original equipment manufacturer's instructions.

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electricalexpert65
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Join Date: Oct 2009
Posts: 2061
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#4

Re: Routine Tests for Transformers

06/25/2010 10:45 AM

TEST & INSPECTION PROCEDURE FOR POWER TRANSFORMERS (As per IEC 60076 & IS 2026)

Description of Test

Type Test

Routine Test

FAT (Factory Acceptance Test) or Inspection Test

Pre-Commissioning Test

Remarks

Measurement of Insulation Resistance

Y

Y

Y

Y

Y - Yes

Measurement of Winding Resistance

Y

Y

Y

Y

Ratio Test

Y

Y

Y

Y

Vector Group Test

Y

Y

Y

Y

Magnetic Core Balance Test

Y

Y

C

Y

C-Customer Choice

Measurement of No-load loss & Exciting Current

Y

Y

C

Y

Measurement of Impedance Voltage & Load Loss

Y

Y

C

Y

Calculation of Efficiency & Voltage Regulation

Y

Y

N

N

N - No

Temperature Rise Test

Y

N

N

N

Measuremnet of Insulation Power Factor

Y

Y

N

N

Lightning Impulse Test on Bushing

Y

N

N

N

Separate Source Voltage Withstand Test

Y

Y

N

N

Induced Overvolatge Withstand Test

Y

Y

N

N

Test on On-Load Tap Changer (If applicable)

Y

Y

C

Y

Tests on Bushing CT (If Applicable)

Y

Y

N

Y

Tests on Protective Devices (OTI, WTI, Buch Holz Relay & MOG)

Y

Y

C

Y

General Inspection

Y

Y

Y

Y

As per Approved Drawing

Vacuum Test & Oil Tightness Test

Y

Y

N

N

Tests on Insulation Oil (If Applicable)

Y

Y

C

Y
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Ali18 (1); electricalexpert65 (1); PeterT (1); PWSlack (1)

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