Routine Test-Acceptance Criteria IEC (Power Transformer)

Acceptance Criteria for Transformer Routine Test

EKARAT ENGINEERING PUBLIC CO.,LTD.

This document is to give a brief outline of the routine testing to be carried out for each transformer. Test Certificates will be given after the test. A comprehensive routine testing procedure can be referred to in the Routine Test Procedure of the Quality Control Department. The routine test is performed in accordance with the IEC 60076 standard. Item

1

Test Item

Objectives

Acceptance Criteria

Test Equipments

Measurement of

To measure the resistance of each

The resistance variation of each HV

Autometic Transformer Winding

winding resistance.

HV and LV windings.

winding within +/- 8%, and the

Resitance Meter  

variation of each LV winding within +/- 12 % 2

Measurement ent of volt oltage age

To measur asure e the the voltage turn urn ratio

The voltage rati atio error shal hall be

ratio and phase

and vector group of the transformer transformers. s. within within +/- 0.5 % for each tap

Transform ormer Turn urn Rat Ratio Meter  ter 

displacement. 3

4

5

Meas Measur urem emen entt of of sho short rt

To measu easure re the the loa load d los losse ses s ( cop copper per

Not Not exc excee eed d + 15% 15% of of gua guarrante anteed ed

circui circuitt imped impedance ance and

losses losses ) and and the the perce percent nt of of imped impedanc anc for Load Loss Loss , and not exceed exceed

load losses.

voltage.

Digi igital tal Pow Power er Meter eter,, Yok Yokog ogaw awa a

+ /- 10% of guaranteed impedance

Meas Measur urem emen entt of of NoNo-lo load ad To mea measu sure re the the no-l no-loa oad d los losse ses s ( cor core e Not Not exc excee eed d + 15% 15% of gua guara rant ntee eed d loss losses es and and no-l no-loa oad d

loss losses es ) and and the the no-l no-loa oad d curr curren entt

current.

( exiting current )

Separate sou sourrce AC

To tes testt th the ins insul ulat atiion between HV HV an and No co collapse of of the the test est vol volta tag ge

voltag voltage e wit withs hstan tand d tes testt

LV side side,, HV HV sid side e and and GND, GND, LV side side

Digi Digita tall Pow Power er Mete Meter, r, Yoko Yokoga gawa wa

for for No-L No-Loa oad d Loss Loss

Apply pot pote ential tes testt set set for AC AC 50 Hz.

and GND ( power frequency test ) Print date 20/9/2005

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Acceptance Criteria for Transformer Routine Test

6

Induced AC voltage test

To test the insulation of each winding

EKARAT ENGINEERING PUBLIC CO.,LTD.

No collapse of the test voltage

between the turns and between

Induced Potential Test Set frequency 200 Hz

winding to widing. 7

Measurement of

To test the insulation resistance

insulation resistance.

between HV and LV windings, HV and >2000 M.Ohm between HV -GND GND, LV and GND.

Print date 20/9/2005

>2000 M.Ohm between HV -LV

Insulation Tester  

>500 M.Ohm between LV -GND

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