What is the measuring range of the DC resistance tester for 100A?
1. Check the welding quality of the wire and lead in the winding;2. Check whether the contact of each position of the tap changer is good;3. Check whether the winding or lead line is broken or not;4, check the correctness of the shunt, whether there is one or several wires broken by the winding of several parallel wires;
DC resistance of the transformer is the transformer manufacturing semi-finished products, finished product testing, installation, commissioning test and electric power department of preventive trials will test the project, can effectively find material, transformer coil welding, the loosening of the connecting part, lack of stock and breakage of manufacturing defects and hidden after operation. In order to meet the need of fast measurement of transformer DC resistance, the ED0204-100A transformer DC resistance tester was developed by our company. The instrument uses a new power supply technology, with small size, light weight, large output current and so on. The whole machine is controlled by single chip microcomputer. It has high automation, and has automatic discharge and discharge indicating function. The instrument has high precision and easy operation, and can realize fast measurement of direct resistance of transformer.
Check whether there is a short circuit between the layer and the turn. This product uses a typical four wire system. In order to improve the accuracy of measuring resistance (especially low resistance). Program controlled constant current source, pre programmed amplifier and A/D converter constitute the main part of measurement circuit. The central control unit through the control of constant current source to the external load to be measured by applying a constant current, high precision, and the obtained data (including test current test voltage, current etc.) for processing, get the actual resistance value.
