Transformer LV Short-circuit Impedance Tester applies to LV load impedance test during delivery, overhaul, trial test and handover test of power transformers (single phase or three-phase).

        It tests the short-circuit impedance (%) of power voltage on site and compares it with the value indicated on the nameplate or the factory default to find out any defects including but not limited to winding displacement or deformation due to currents from major failure during transformation, installation or operation following the delivery test. (The short circuit change shall be considered as significant if it exceeds ± 3% as specified in China International Conference on Electricity Distribution 2000 (“CICED 2000”)).

      Transformer LV Short-circuit Impedance Tester is not provided with an external voltage regulator and adopts the primary connection mode. It begins the three-phase testing and calculates impedance error percentage automatically when the parameter is entered and provides intuitive results. This is a rapid tester which detects winding deformation of transformers on site.

Scope of voltage measurement: 5~400V

Accuracy of measurement: 0.2d

1.The tester is supplied with AC220V low voltage power to provide current for AB, BC and CA high voltage windings of the transformer automatically; collects data simultaneously and; calculates impedance error percentage automatically with intuitive testing results;

2.The tester completes the three-phase testing automatically in the primary connection mode other then inversed connection with the testing wire;

3.The tester allows either single phase testing or three-phase testing both manually and automatically;

4.The tester achieves output current limit applicable to test item with any impedance;

5.The test item can be measured without an external voltage regulator;

6.The tester functions in measuring zero sequence impedance;

7.The tester functions in measuring inductance;

8.The tester has a large LCD display with a menu in Chinese. Operation are facilitated based on the notes on the display;

9.The tester enables printing and storage and is featured with high testing accuracy, high automation, small in size and light weight.

• Wiring of the three-phase dual-winding transformer is consistent with the selected position to be measured. If a High-Low position is selected for measurement, the testing wire should be connected to the HV side while the LV side is under short circuit; the remaining wires are under open circuit. If a High-Medium position is selected, the testing wire should be connected to the HV side while the medium voltage side is under short circuit; the remaining wires are under open circuit. If a Medium-Low position is selected, the testing wire should be connected to the medium voltage side while the LV side is under short circuit; the remaining wires are under open circuit.

• The section of short circuit wire should be no less than 10 mm2 (bare copper wire is preferred). Such wire should be in good contact; otherwise it will affect the accuracy of testing data.

Tester

1 Set