Technical requirements for partial discharge testing instruments. With high sensitivity, tested samples, high-frequency elliptical scanning, large dynamic range of discharge system, and adopted anti-interference components and gate display circuit, suitable for type tests, factory tests of high-voltage products, new product development tests, quantitative testing of partial discharge in motors, transformers, cables, bushings, capacitors, transformers, arresters, switches and other high-voltage electrical appliances. It can be used on-site by manufacturers, scientific research departments, and power departments.
1. Partial discharge: Partial discharge refers to an electrical discharge where the insulation between conductors is only partially bridged. This discharge can occur near the conductor or not near the conductor.
2. Apparent charge q: When a certain amount of charge is instantaneously injected at both ends of the test object, this injected amount is the apparent charge package amount of the partial discharge.
3. Apparent discharge calibrator: The apparent discharge calibrator is composed of a calibration pulse generator and a calibration capacitor in series, and is a calibration charge generating device.
The main technical parameters of the calibrator include the rise time of the calibration pulse waveform, decay time, calibration pulse peak value, and calibration capacitance value.
The voltage waveform rise time is from 0.1Uo to 0.9Uo, and the decay time is defined as the time from the peak value dropping to 0.1Uo.
(3) Working mode: Standard - Extended - Linear) High-frequency time base ellipse can be adjusted to the correct size according to the input voltage (13-275V).
8. Has a zero marking system for auxiliary identification of discharge pulses. 9. Working current: 220V±10% power frequency
The volt-ampere characteristic tester mainly consists of a host and an optional external booster. The relay protection tester host is composed of a built-in booster, DSP control circuit, sampling processing circuit, 320×240 dot matrix full Chinese LCD, 40-column micro printer, PC communication interface, host power supply, and various interfaces required for testing. Using MBC power control technology, single-phase AC 220V input power, working power and power share one input port, the design is more scientific and reasonable. The power output of the equipment is actual voltage, microcomputer relay protection tester current value, the waveform is a standard sine wave, frequency is 50-60Hz, can effectively simulate the real state of the transformer, and meet the requirements of relevant maintenance regulations.
5. If not in a laboratory environment, it can only be used after reliable grounding connection. The grounding point should be selected as close to the test object as possible.
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