Potential transformer testing pdf

Select the megger range corresponding to the ratings of the equipment under test. Highvoltage transformers are some of the most important and expensive pieces of equipment. The accuracy and reliability of the test data is directly. The ratio and phase angle of an instrument transformer may be accmately determined by laboratory. W 1 is a wattmeter whose potential coil is connected across the secondary of the standard transformer. Check that all parts of the transformer are properly assembled and tight. Transformer testing type tests and routine tests of. General visual inspection and compliance with the drawings and manuals. The total amount of voltage induced will be equal to the sum of the voltages induced in each turn. Pdf the voltage transformer test is an important means to monitor its operating state. So for ensuring proper performance of electrical power transformer, voltage and turn ratio test of transformer one of the important tests. Potential transformers pts are necessary to a power system for metering and protective relaying to convert higher system voltages to lower control voltages that are more practical from an equipment, operation, and safety perspective.

Test equipment within calibration date, tested and tagged. Check nameplate ratings and hv, lv terminal markings. The pressure coil of wattmeter w 2 is so connected that a voltage. P otential transformers pts are necessary to a power system for metering and protective relaying to convert. Voltage transformer testing swp page 1 of 19 standard work practice sp0508 ver 7 ergon energy corporation limited abn 50 087 646 062 1. Inspection and test procedures for instrument transformers. Pdf the application of voltage transformer simulator in electrical. The ratio of the number of turns in a higher voltage winding to that in a lower voltage winding. V which is the difference between secondary voltages of standard and test transformers, is impressed across it.

This test also performed as a routine test of transformer. Calculate the expected secondary voltage test voltage pt ratio. Insulation resistance tester, microohmmeter, high voltage test set, digital voltmeter, cvt test set. So transformer ratio test is an essential type test of transformer. Transformer testing low voltage jefferson electric. I scored this potential transformer at a local junkyard and here is a video of me testing it using a mot as a ballast. Connect the variable transformer across the primary winding.

How to check the transformer polarity testing 480v. I checked the polarity of the 480v potential transformer. The amount of voltage induced in each turn of the secondary winding will be the same as the voltage across each turn of the primary winding. Brooks testingpotentialtransformers 421 needstobemeasuredwithonlymoderateaccuracy.