First of all, the purpose and meaning of the test transformer tester is to short-circuit the cable end on one side of the transformer winding tester, and the extra current is supplied on the other side of the nominal frequency. When the extra current flows through the two coils, magnetic leakage occurs. through. The transformer DC resistance tester should be far away from strong electric fields, strong magnetic fields, and high-frequency equipment. The smaller the power supply disturbance is, the better. The lighting cable should be used. If the power disturbance is still large, the instrument can be powered by the AC purification power supply, and the capacity of the AC purification power supply should be greater than 200VA. When the transformer resistance tester is in operation, if the LCD screen appears disorderly and there is no response when pressing all the buttons, perhaps the measured value is far from the actual value, please press the reset button, or turn off the power, and then operate from the beginning. In addition to the resistance loss in the winding and the additional current that occurs in the magnetic flux leakage loss of the winding and the near-loss structural member, it is called the no-load loss, that is, the measured load loss test. When the transformer resistance tester is in operation, if the LCD screen appears disorderly and there is no response when pressing all the buttons, perhaps the measured value is far from the actual value, please press the reset button, or turn off the power, and then operate from the beginning. Short-circuit the windings to generate a voltage load test. The additional current impedance applied voltage is generally indicated as a percentage of the additional voltage. Regardless of the size of the transformer tester, the load loss is the most total loss, and the analysis of the load loss can be checked in the structure and production of the faulty transformer tester. Impedance transformer tester is also one of the important conditions for parallel operation.
2. Specification and load requirement test
1. Impedance voltage and load loss should meet the requirements of GB1094.1.
2. The loading test should be connected to the main point.
3. The dual-winding transformer is supplied from the extra current side of the tester sample, and the other side of the short circuit is measured once. The three-winding transformer measuring instrument should be carried out between one pair of windings, and the other windings should be open. Second, the load test test method transformer load tester, generally such a large extra current winding short side, in the tap, the nominal orientation of the extra frequency of the extra current winding, the other side in this case, the loss is measured Load loss, because the percentage of voltage measures the impedance voltage (PU) of the additional voltage. The two single-phase transformers and three-phase transformers measured by the power meter are basically the same load test as the three electrical meter wiring diagrams measured by the measuring instrument and tester. Fourth, three-phase transformer tester load test three-phase single-phase single-phase transformer tester load test is the analysis of the corresponding bipolar load loss. Compared with the investigation of the load loss of the winding during each stage of the production process, it is scattered to find the shortcomings. It is an effective way to find faults. When the power windings connected in a star shape, the additional current from the high voltage side AB, BC, the CA power supply, and the additional frequency should be dispersed to the loss of the measurement PAB AB phase, the voltage UAB is lost in the PBC BC phase, and the voltage UBC; PCA, when the power supply voltage UCA increments are connected to the windings, in addition to the bipolar power is applied, one phase is also continuously applied (one phase short circuit, BC phase power supply;. B short circuit CA phase load loss phase short circuit, AC power supply; C phase Short circuit, AB phase power supply)