Product Details

Introduction to Inductive Load DC Resistance Tester:

Connect all high and low voltage current and potential test leads to the transformer at once, no need to switch test leads during the testing process;

For star-connected winding tests, the instrument can test the resistance of phases A0, B0, and C0 simultaneously in a three-phase test mode, saving test time;

When testing the low voltage side of a three-phase five-limb transformer with internal delta connection, the instrument uses an automatic magnetic assist method internally, which is faster than directly using high current for testing;

Display and print all test data of the high, medium, and low voltage windings of the transformer, automatically calculate the three-phase unbalance rate, and also print the resistance values converted to the rated temperature;

During three-phase testing, first test the data of A0, then test all three phases simultaneously, which solves the problem that the neutral point lead resistance cannot be tested during simultaneous three-phase testing, and the test data is closer to single-phase test values

Inductive Load DC Resistance Tester

The instrument should be reliably grounded. After connecting the test leads, power on. During the output current test, do not remove the test leads to avoid accidents. After completion, wait until the current arc extinction indication ends or the audible and visual alarm stops before turning off the power and removing the test leads.

When using the three-channel method to measure an on-load tap changer transformer, the tap changer can be switched under load, saving charging time.

When measuring an off-circuit tap changer transformer, wait until the discharge indication alarm stops before switching the tap changer or changing gears.

The magnetic assist test is mainly for three-phase five-limb transformers where the low voltage winding is delta-connected; (if the low voltage winding is found to be delta-connected and charging is slow during testing, the magnetic assist method can be used for testing)

Wiring and Operation

1. Use the power cord to connect the instrument to an external AC 220V power supply, and use the grounding wire to connect the grounding terminal to the earth.

2. For two-winding transformer testing, connect the four test clips (yellow, green, red, black) of the high voltage test lead to the A, B, C, O bushings on the high voltage side respectively. If there are only three bushings A, B, C, the black test clip can be left hanging; connect the other end of the test lead to the corresponding terminals on the instrument. Connect the four test clips (yellow, green, red, black) of the low voltage test lead to the a, b, c, o bushings on the low voltage side respectively. If there are only three bushings a, b, c, the black test clip can be left hanging; connect the other end of the test lead to the corresponding terminals on the instrument.

Note: No need to switch leads during the entire testing process.

3. For three-winding transformers, after testing the high and low voltage windings, switch the four test clips of the high voltage test lead to the medium voltage side for testing.

4. For single-phase transformers, connect the yellow and black test clips of the high voltage test lead to the high voltage side of the single-phase transformer, and the yellow and black test clips of the low voltage test lead to the low voltage side of the single-phase transformer.

5. The dedicated test leads provided with the instrument have the current and voltage lines designed into the same clamp, making wiring simple and convenient.

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