ZZS-3A DC Resistance Tester
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Overview:
The ZZS-3A DC Resistance Tester is an essential test item for transformers after handover, major repairs, and tap changer changes. Under normal circumstances, using traditional methods (bridge method and voltage drop method) to measure the DC resistance of transformer windings and high-power inductive equipment is a time-consuming and labor-intensive task. To change this situation, shorten measurement time, and reduce the workload of test personnel, this DC resistance fast tester was developed. With a high-speed microcontroller at its core, built-in rechargeable battery and charging circuit, and adopting high-speed A/D converter and programmable current source technology, it achieves excellent measurement results and highly automated measurement functions. It features high accuracy, wide measurement range, stable data, good repeatability, strong anti-interference capability, and comprehensive protection functions. It has fast charge and discharge speeds. This instrument is small in size, light in weight, and easy to carry. It has the characteristics of rapid measurement, convenient use, and high measurement accuracy. The self-check and automatic calibration functions reduce the difficulty of instrument use and maintenance, making it an ideal device for measuring the DC resistance of transformer windings and high-power inductive equipment.
Features
1. Adopts high-speed 16-bit A/D converter, with stable measurement data and good repeatability.
2. Automatic programmable current source technology, with a total of 1000 current gears set in the current source, automatically controlled by the internal microcontroller according to the measured resistance, thereby achieving a relatively wide measurement range and measurement state without manual current gear switching.
3. Highly intelligent design, with ingenious and advanced function settings, can automatically judge faults such as loose test line connection and disconnection.
4. Comprehensive protection functions, reliably protect the instrument from back EMF impact, and have automatic discharge indication function.
5. Can display measurement current and measurement time.
6. Intelligent power management technology effectively reduces internal heating of the instrument.
7. Can store 120 measurement data, not lost after power off.
8. All Chinese menu and operation prompts, intuitive and convenient.
Technical Specifications
1. Measurement range: 1mΩ-2KΩ
2. Output current: 10A
3. Measurement accuracy: 0.2%±2 digits
4. Maximum resolution: 1uΩ
5. Working power: AC220V±10%
6. Ambient temperature: -10-40℃ Humidity: ≤85% (no condensation)
Instrument Characteristics:
◆ This instrument has a large output current (maximum can output 20A) and a wide test range (up to 2KΩ), suitable for temperature rise tests and DC resistance measurement of all transformers up to 35KV voltage level.
◆ Perfect dual power supply design. Has the function of simultaneous testing and separate testing of high-voltage and low-voltage sides.
◆ This machine has input misconnection AC380V power supply protection alarm function, disconnection anti-arc protection function, audible discharge alarm function, clear indication, reducing misoperation. Perfect protection circuit, high reliability.
◆ Color large screen, touch operation, clear and readable data display.
◆ Temperature rise test automatically prints and stores temperature rise data at set time intervals for convenient recording.
◆ The instrument has a calendar, storage of 100 sets of routine data, and storage of two temperature rise test results, data not lost after shutdown. And it is equipped with a "U disk" interface for convenient export to generate temperature rise curves on a computer.
◆ This instrument has an RS485 communication interface, with host computer control software, to achieve remote control measurement.
◆ This machine is equipped with temperature rise software for automatic data processing and generation of temperature rise curves.
Note: The above information and technical parameters are compiled and published by Yangzhou Darui Electric Co., Ltd.
