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 reconnect test leads during the test.

For star-connected windings, the instrument can test the resistance of phases A0, B0, and C0 simultaneously in three-phase mode, saving test time.

For three-phase five-limb transformers with low-voltage 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, and also print the resistance values converted to rated temperature.

In three-phase testing, first test the A0 data, 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, turn on the power. During the output current test, do not remove the test leads to avoid accidents. After completion, wait until the current arc indication ends or the audible and visual alarm stops before turning off the power and removing the test leads.

When using the three-channel mode to measure on-load tap-changing transformers, the tap changer can be switched under load, saving charging time.

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

Magnetic assist testing is mainly for three-phase five-limb transformers with delta-connected low-voltage windings; (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 transformers, connect the four test clamps (yellow, green, red, black) of the high-voltage test leads to the A, B, C, and O bushings on the high-voltage side respectively. If there are only three bushings A, B, and C, the black test clamp can be left floating; connect the other end of the test leads to the corresponding terminals on the instrument. Connect the four test clamps (yellow, green, red, black) of the low-voltage test leads to the a, b, c, and o bushings on the low-voltage side respectively. If there are only three bushings a, b, and c, the black test clamp can be left floating; connect the other end of the test leads to the corresponding terminals on the instrument.

Note: No need to reconnect leads during the entire test process.

3. For three-winding transformers, after testing the high and low voltage windings, reconnect the four test clamps of the high-voltage test leads to the medium-voltage side for testing.

4. For single-phase transformers, connect the yellow and black test clamps of the high-voltage test leads to the high-voltage side of the single-phase transformer, and the yellow and black test clamps of the low-voltage test leads 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 on the same clamp, making wiring simple and convenient.

Parameters: