HBKC-2002 transformer on-load tap changer tester is an integrated measuring instrument for measuring and analyzing the electrical performance indicators of power transformers and on-load tap-changers of special transformers in power systems. It is controlled by a computer and can measure the transition time, transition waveform, transition resistance, three identical phases, and other parameters of the on-load tap-changer through specially designed measurement circuits. The on-load tap-changer is a very important part of the transformer. It is necessary to carry out relevant inspections and tests on the transformer during the handover and overhaul to ensure the quality of the on-load tap-changer installation or overhaul, and to ensure that the on-load tap-changer can Long-term safe operation. Among them, the on-load tap-changer operating characteristic test is an important test item. Through the switching waveform measured by the experimental item, it can be seen whether the switch can operate correctly, thereby judging whether the on-load tap-changer has abnormal movement of the motor-driven mechanism. Deformation of insulation barrel, burning of contacts, breakage of drive shaft, etc.
On-Load Tap-Changer Switching Principle The on-load tap-changer changes the tap position in the presence of a load, so it must meet two basic conditions: a. In the process of switching taps, the load current must be continuous, That is, can not open the way; b. In the conversion tapping process, to ensure that the tap can not be shorted. Therefore, in the process of switching taps, it is necessary to bridge the two taps at the same time to ensure the continuity of the load current; and in the bridge between the two taps, resistors must be connected in series to limit the circulating current. A tap short occurs so that the on-load tap-changer can transition from one tap to the next. The circuit that realizes this function is called over-circuit. The corresponding mechanism is the switch. The switching light can be divided into single resistor, double resistor and four resistors. The common one is the double-resistor switch.