The DC resistance quick tester is a high-precision replacement product for DC single and double arm bridges. The DC resistance test of transformer windings is an essential test item after transformer handover, major repair, and tap changer changes. By measuring the DC resistance of transformer windings, it is possible to check the quality of lead welding or connections, whether there are inter-turn short circuits or open circuits in the windings, and whether the tap changer contacts are in good condition. Previously, the measurement of DC resistance was carried out using a QJ44 double arm bridge, but the measurement current of such a bridge is in the milliampere level, making the measurement time very long and the accuracy relatively low. To change this situation, shorten the measurement time, and reduce the workload of test personnel, the DC resistance quick tester was developed.
The DC resistance test of transformer windings is an essential test item after transformer handover, major repair, and tap changer changes. By measuring the DC resistance of transformer windings, it is possible to check the quality of lead welding or connections, whether there are inter-turn short circuits or open circuits in the windings, and whether the tap changer contacts are in good condition.
The DC resistance quick tester is a high-precision replacement product for DC single and double arm bridges. The instrument adopts advanced switching power supply technology, and its measurement speed is more than a hundred times faster than that of a bridge. The display part uses a four-and-a-half digit LCD to display the measurement results, and a three-and-a-half digit LCD to display the ambient temperature or test current value, overcoming the disadvantage of other similar products where LED display values are difficult to read in sunlight. At the same time, it has an automatic arc suppression function. This instrument has the advantages of fast measurement speed, high accuracy, intuitive display, strong anti-interference capability, small size, low power consumption, stable and reliable test data, and is not affected by human factors. The instrument is equipped with a built-in rechargeable battery pack (12V), supports both AC and DC power, and is convenient for on-site and field testing.
