HLY-200A Loop Resistance Tester
Product Introduction
Currently, the conventional QJ44 double-arm DC bridge is commonly used in power systems for measuring contact resistance. However, the test current of such bridges is only in the mA level, making it difficult to detect defects caused by reduced cross-sectional area of loop conductors. When measuring the contact resistance of high-voltage switch conductive loops, the measured value can be several times larger due to the influence of oil film and oxide layer between contacts, failing to accurately reflect the true contact resistance. To address this, the Ministry of Electric Power standard SD301—88 "Procedures for AC 500KV Power Equipment Handover and Preventive Tests" and the new edition of "Procedures for Preventive Tests of Power Equipment" stipulate that the measurement current for contact resistance of circuit breakers and disconnecting switches should not be less than DC 100A, ensuring accurate test results.
HLY-200A Loop Resistance Tester is designed by combining high-frequency switching power supply technology and digital circuit technology. It is suitable for measuring the loop resistance of switch control equipment. The test current adopts DC 100A and 200A as recommended by national standards. The loop resistance can be directly measured at a current of 100A, or directly measured at a current of 200A, with results displayed digitally. This instrument offers accurate measurement and stable performance, meeting the requirements for on-site high-voltage switch maintenance in power and power supply departments, as well as loop resistance testing in high-voltage switch factories.
Product Features
1. High Current: Utilizes the latest power supply technology, capable of continuously outputting high current for extended periods, overcoming the drawbacks of instantaneous current in pulse power supplies, effectively breaking through the oxide film on switch contacts to achieve good test results.
2. Strong Anti-interference Capability: Under severe interference conditions, the last digit of the LCD can stabilize within ±1 digit, ensuring stable readings and good repeatability.
3. Long Service Life: All high-precision resistors are used, effectively eliminating the influence of ambient temperature on measurement results, while also enhancing vibration resistance.
4. Portability: Compact size and light weight.
Product Parameters
1. Measurement Range: 1～1999 μΩ.
2. Resolution: 1 μΩ.
3. Test Current: DC 50A, 100A, 150A, 200A four fixed output levels.
4. Measurement Accuracy: 0.5%±1d.
5. Working Mode: Continuous.
6. Display: Three and a half digit LCD.
7. Power Supply: AC220V±10%, 50Hz.
8. Operating Environment: Temperature -10℃～40℃, Humidity ≤80% RH.
9. Dimensions: 380mm×350mm×260mm.
10. Weight: 9.6Kg (excluding accessories).
Product Accessories
| Name | Description | Quantity |
| Instrument Main Unit | / | 1 unit |
| Special Test Leads | High-current wires 4m each (2 pieces), high-current test clips (2 pieces), voltage test wires 4m each (2 pieces) | 1 set |
| Ground Wire | / | 1 piece |
| Fuse | 10A | 3 pieces |
| Accessory Bag | / | 1 piece |
| Power Cord | AC 220V | 1 piece |
| User Manual | / | 1 copy |
| Test Report | / | 1 copy |
| Certificate of Conformity | / | 1 sheet |
