Introduction:
ट्रांसफार्मर के प्रदर्शन के अनुरूप करने के लिए ट्रांसफार्मर पर विभिन्न परीक्षण आवश्यक हैं।
मुख्य रूप से ट्रांसफार्मर को भेजने से पहले निर्माता द्वारा मुख्य रूप से दो प्रकार के ट्रांसफार्मर लगाए जाते हैं
(1) Type test of transformer and
(2) Routine test.
इसके अलावा कुछ अन्य परीक्षण भी उपभोक्ता द्वारा कमीशन से पहले और समय-समय पर अपने जीवन भर नियमित और आपातकालीन आधार पर किए जाते हैं।
ट्रांसफार्मर परीक्षण मुख्य रूप से वर्गीकृतहै
Transformer Tests done by Manufacturer
(A) Routine Tests
(B)Type Tests
(C) Special Tests
Transformer Tests done at Site
(D) Pre Commissioning Tests
(E) Periodic/Condition Monitoring Tests
(F) Emergency Tests
(A) Routine tests:
All transformers are subjected to the following
Routine tests:
§ Insulation resistance Test.
§ Winding resistance Test.
§ Turns Ration / Voltage ratio Test
§ Polarity / Vector group Test.
§ No-load losses and current Test.
§ Short-circuit impedance and load loss Test.
§ Continuity Test
§ Magnetizing Current Test
§ Magnetic Balance Test
§ High Voltage Test.
§ Dielectric tests
§ Separate source AC voltage.
§ Induced overvoltage.
§ Lightning impulse tests.
§ Test on On-load tap changers, where appropriate.
(B) Type tests
§ Temperature rise test (IEC 60076-2).
§ Dielectric type tests (IEC 60076-3).
(C) Special tests
§ Dielectric special tests.
§ Zero-sequence impedance on three-phase
transformers.
§ Short-circuit test.
§ Harmonics on the no-load current.
§ Power taken by fan and oil-pump motors.
§ Determination of sound levels.
§ Determination of capacitances between windings
and earth, and between windings.
§ Determination of transient voltage transfer
between windings.
§ Tests intended to be repeated in the field to
confirm no damage during shipment, for example frequency response analysis
(FRA).
(D) Pre commissioning
Tests
§ All transformers are subjected to the following
Pre commissioning tests:
§ IR value of transformer and cables
§ Winding Resistance
§ Transformer Turns Ratio
§ Polarity Test
§ Magnetizing Current
§ Vector Group
§ Magnetic Balance
§ Bushing & Winding Tan Delta (HV )
§ Protective relay testing
§ Transformer oil testing
§ Hipot test
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