Insulation Resistance Tester
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The insulation resistance tester is mainly used to measure the insulation resistance of large transformers, mutual inductors, generators, high-voltage motors, power capacitors, power cables, lightning arresters and other equipment.
Features
1. The resistance range can be automatically switched, with corresponding indication.
2. Two ways to synchronously display insulation resistance value. The mechanical pointer adopts ultra-thin taut band suspension structure with strong anti-vibration capability. The mechanical pointer allows easy observation of the change range of insulation resistance, while the dot-matrix LCD screen guides users in operating the instrument and provides accurate measurement results.
3. The mechanical meter head and LCD screen are combined into one. Dual scale display, automatic range conversion. Colorful scale for easy reading.
4. Adopts embedded industrial microcontroller and real-time operating software system. High automation, strong anti-interference capability, the instrument can automatically calculate absorption ratio and polarization index without manual intervention.
5. User-friendly interface, all measurement results have power-off protection function, can continuously store 20 measurement results.
6. When the instrument generates high voltage, a prompt tone is output.
7. Built-in residual high voltage discharge circuit, after testing, it can automatically discharge residual high voltage on the tested equipment.
8. Dual AC/DC power supply, equipped with rechargeable battery and AC adapter.
9. The instrument adopts portable design, convenient for field operation.
Technical Parameters
1. Output voltage: 500V, 1000V, 2500V, 5000V
2. Insulation resistance: 200GΩ
3. Accuracy: 5%
4. High voltage short circuit current: 3mA
5. Insulation performance: when the voltage between circuit and shell is 1000V DC, maximum 2000MΩ
6. Withstand voltage performance: when the voltage between circuit and shell is 2500V AC, withstand for 1 minute
7. Dimensions: 230mm×190mm×90mm (L×W×H)
8. Weight: 2KG
Preparation
(1) Before measurement, the power supply of the tested equipment must be cut off, and the ground short-circuit discharge must be performed. It is absolutely not allowed to measure with the equipment energized, to ensure the safety of personnel and equipment.
(2) For equipment that may induce high voltage, measurement can only be carried out after eliminating this possibility.
(3) The surface of the tested object should be clean to reduce contact resistance and ensure the correctness of measurement results.
(4) Before measurement, check whether the megger is in normal working state, mainly check its "0" and "∞" points. That is, shake the handle to make the motor reach rated speed. When short-circuited, the megger should point to "0" position; when open-circuited, it should point to "∞" position.
(5) When using the megger, it should be placed on a stable and firm place, and far away from large external current conductors and external magnetic fields.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
