Product Introduction
The Three-Channel DC Resistance Tester is a mandatory test item for semi-finished and finished products in transformer manufacturing, factory acceptance tests, installation, handover tests, and preventive tests by power departments. It can effectively detect manufacturing defects such as material selection, welding, loose connections, missing strands, broken wires in transformer coils, as well as hidden dangers after operation. This instrument adopts power supply technology and features small size, light weight, and large output current. The whole machine is controlled by a microcontroller, automatically completing self-check, data processing, display, and other functions, with automatic discharge and discharge indication functions. The instrument has high testing accuracy and is easy to operate, enabling rapid measurement of transformer DC resistance.
TPZRC-S Three-Channel DC Resistance Tester (20A) adopts a dual power supply structure, enabling simultaneous three-phase energization for transformers with tap-changing YN connected windings. The measurement system uses independent three-channel current sampling and independent three-channel voltage sampling, measuring and displaying three-phase resistance values and three-phase unbalance rate simultaneously. This greatly shortens working time and solves the problem of long testing time for DC resistance of each tap winding in power transformers, taking only 1/3 of the time required by traditional methods.
Functional Features
1. The instrument outputs large current and automatically selects the current, making operation simple.
2. Three-channel measurement with real-time acquisition, measuring three resistance values simultaneously and calculating the three-phase resistance unbalance.
3. It can measure three phases simultaneously or use traditional single-channel measurement, and also has temperature conversion function for convenience.
4. Equipped with a comprehensive protection circuit for high reliability.
5. Features non-volatile calendar, clock, 80 sets of data storage, recall, and printing functions.
6. Allows setting of phase sequence, tap position, and other printing information for resistance.
7. Vertical case structure for easy field operation.
8. Equipped with audible discharge alarm and clear discharge indication to reduce misoperation.
Technical Specifications
1. Output Current: Automatic current selection (20A)
2. Output Voltage: DC12V
3. Measurement Range: 0～100Ω
4. Accuracy: 0.2%±0.5μΩ
5. Resolution: 0.1μΩ
6. Operating Environment: Temperature -20～40℃ Humidity ≤80%RH, no condensation
7. Power Supply: AC220V±10%, 50Hz±1Hz
