100A Loop Resistance Tester - Yangzhou Darui - Yangzhou Darui Electric Co., Ltd.

100A Loop Resistance Tester - Yangzhou Darui

Published: 2020-08-23 13:53:14

Category: Loop Resistance Tester

Product Description

100A Loop Resistance Tester

Darui Electric recommends:

In power systems, the conventional QJ44 double-arm DC bridge is commonly used to measure the DC resistance of transformer windings and the contact resistance of high-voltage circuit breakers. However, the test current of such bridges is only in the mA level, making it difficult to detect defects such as reduced cross-sectional area of conductors in the conductive loop of transformer windings.

Overview

In power systems, the conventional QJ44 double-arm DC bridge is commonly used to measure the DC resistance of transformer windings and the contact resistance of high-voltage circuit breakers. However, the test current of such bridges is only in the mA level, making it difficult to detect defects such as reduced cross-sectional area of conductors in the conductive loop of transformer windings. When measuring the contact resistance of high-voltage switch conductive loops, due to the influence of oil film and oxide layers between moving and static contacts, the measured resistance value is several times larger, masking the true contact resistance value. Therefore, the Ministry of Electric Power standard SD301—88 "Regulations for Handover and Preventive Tests of AC 500kV Electrical Equipment" and the new edition of "Regulations for Preventive Tests of Electrical Equipment" stipulate that the measurement current for contact resistance of circuit breakers and disconnecting switches shall not be less than 100A to ensure measurement accuracy.

Technical Indicators

1. Measurement range: 1～1999μΩ

    2. Resolution: 1μΩ

    3. Test current: DC 100A

    4. Measurement accuracy: 0.5%±1d

    5. Display: Current: three-and-a-half-digit LCD

             Resistance: three-and-a-half-digit LCD

    6. Working power: AC220V±10% 50Hz

    7. Working environment: Temperature -10℃～40℃ Humidity: ≤80 %RH

    8. Dimensions: 300×270×200 mm3

    9. Weight: 5Kg (excluding accessories)

Product Aliases

100A Loop Resistance Tester, Switch Loop Resistance Tester, Contact Loop Resistance Tester, Contact Resistance Tester.

Product Features

1. High current: Using the latest power supply technology, it can continuously output high current for a long time, overcoming the drawbacks of instantaneous current from pulse power supplies. It can effectively break through the oxide film on switch contacts, yielding good test results.

2. Strong anti-interference capability: Under severe interference conditions, the last digit of the LCD reading can remain stable within ±1 digit, with stable readings and good repeatability.

3. Long service life: All high-precision resistors are used to effectively eliminate the influence of ambient temperature on measurement results. Meanwhile, the use of military-grade connectors enhances vibration resistance.

4. Easy to carry: Small size and light weight.

Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.

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Product Details

100A Loop Resistance Tester - Yangzhou Darui