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 good. Previously, the measurement of DC resistance was carried out using a QJ44 double arm bridge, but the measurement current of such bridges is at the milliampere level, requiring a long time to measure and having low accuracy. To change this situation, shorten 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 good.
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 bridges. The display part uses a four-and-a-half-digit LCD to display measurement results, and a three-and-a-half-digit LCD to display ambient temperature or test current value, overcoming the disadvantage of other similar products with LED displays that 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 rechargeable battery pack (12V), supports both AC and DC power, and is convenient for on-site and field testing.
