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Precautions for winding deformation tester

time:2020/9/16   source:华天电力  reading:238 time

Transformer winding deformation tester is used to test power transformers with voltage levels of 6kV and above and other special-purpose transformers. Power transformers are inevitably subject to various fault short-circuit currents or physical shocks during operation or transportation. Under the strong electromotive force of the transformer, the transformer windings may lose stability, causing permanent deformation such as partial distortion, bulging or displacement, which will seriously affect the safe operation of the transformer.

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Precautions during use of the winding deformation tester:

 

(1) Before use, please check the appearance of the tester, check whether the position of the power switch is in the "off" position and whether the terminals are normal;

 

(2) Please do not start the winding deformation test before the "grounding" of the tester is connected correctly;

 

(3) The terminal of the transformer under test should be fully discharged before the test;

 

(4) The winding deformation test should be carried out under the premise of unfastening all the leads of the transformer (including overhead wires, enclosed bus bars and cables), and keeping these leads as far away from the transformer bushing as possible (the surrounding grounding body and metal suspension should leave the transformer The sleeve is more than 20cm), especially the transformer connected to the closed bus;

 

(5) The position of the tap switch must be recorded correctly during the test. The tap changer of the transformer under test should be placed as far as possible in the first tap, especially for on-load tapping transformers to obtain more comprehensive winding information. For no-load tapping transformers, ensure that each measurement is at the same tap position for easy comparison;

 

(6) The transformer core must be reliably grounded to the shell. The tester shell and the measuring impedance shell must be reliably grounded to the transformer shell;

 

(7) The wiring clamp for measuring impedance should be in close contact with the casing clamp. If there is conductive paste or rust on the casing clamp, it must be wiped clean with emery cloth or dry cotton cloth;

 

(8) After the tester is used, it should be placed in a clean, low temperature location to avoid strong vibration and prevent dirty dust from entering the tester.


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