GOZ-HLY-100A Contact Resistance Tester (CRM)
Nowadays Power Systems widely use model QJ44 DC double arm bridge to measure contact resistance (DC resistance and Loop resistance of high-voltage circuit breaker) while the minimum current of such model is 1mA which hardly find the decrease of cross-sectional area of transformers' conductive circuit conductor. The measurement of loop resistance of high voltage switchgear is affected by oil layer and oxide between static and dynamic contact port, so the resistance measurement value will be several times larger, and can not reflect the true value of contact resistance. Therefore, the Ministry of Electric Power in national standards SD301-88 "AC 500KV Electrical Equipment Transfer and Preventive Test Procedure" and new version of " Electrical Equipment Preventive Test Procedure" stipulate that the testing current of circuit breaker and isolating switch contact resistance is not less than 100A to ensure accurate test results.
GOZ-HLY-100A Contact Resistance Tester (CRM) measures up to the latest power system standards--DL/T845.4-2004 designed for measuring loop resistance of Switching Control Equipment using High-frequency switching power supply technology and digital circuit technology. Test current of the Tester is DC 100A which is recommended in the national standards. The tester can measure the loop resistance at this value and display the result in digital. It is high precision and good stability and can meet most power systems' requirements in onsite high-voltage switches maintenance and high-voltage switches factory loop resistance measurement. (It performances accurately and stably).
Alternative Name
Contact Resistance Tester, ground resistance tester, contact Contact Resistance Tester.
1. High current, adopts new power techniques, can output current long time and continuously , overcome the malpractice of instantaneous current of the impulse type power, can effectively
break through the oxide film of the switch contact, get accurate test results.
2. Strong anti-interference ability, under strong interference, the last number displayed by the LCD within the range of ±1, with steady reading and good reproducibility.
3. Long life performance, uses resistance in high precision which eliminates the effect to test results by temperature, meanwhile strengthen the resistance to shock.
4. Easy to carry , small in volume, light in weight.
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 LCD
6. Power Supply:AC220V±10% 50Hz
7. Work Environment:
Temperature: 10℃～40℃ Humidity:≤80 %RH
8. Dimension:300mm×270mm×200mm
9. Weight:5Kg(Accessories excluded)