HLY-III-type loop resistance

>> Products - Resistance Tester → DC | Circuit | insulation - loop resistance tester Tel: 021-54358329 Mobile: 15601723663 Fax: 021-54011883 Product Name: HLY-III-type loop resistance tester for use Application: Loop resistance Tester Instructions Introduction: HLY-III-type loop resistance tester instructions present, the power system commonly used DC resistance of conventional arms QJ44 type DC bridge measuring transformer coils, high voltage circuit breaker contact resistance, and such electricity When the bridge is only mA test current level, is difficult to find the transformer coil conductive circuit conductor cross-sectional area decreases defects in conductive loop measurement of high voltage switch contact resistance, due to the impact of the oxide layer between the film and the moving contacts, the measured value is several times larger to cover up the true value of the contact resistance. For example: 93 February 8, Handan Electric Power Bureau, in the 200KV substation 200KV switch contact resistance test, the first use of QJ44 type double bridge measuring, wherein the phase contact resistance 1370μΩ while the national standard is not more than 800μΩ use capacitor discharge its numerical suddenly suddenly small, we can not determine, by the use of 100A DC resistance tester, data 450μΩ. With the instruments to measure, due to the large current contact between the film and the oxide layer burned and reflect the true results. Therefore, Ministry of standard SB301-88 "AC 500KV electrical equipment and preventive testing procedures" and new "preventive test code for electrical equipment" for the circuit breaker, isolating switch contact resistance measurements made not less than DC 100A current provisions to ensure accuracy. HLY-II-type loop resistance tester is a digital circuit technology and a switching circuit technology to produce, it is a contact resistance for switching control devices, circuit resistance measurements of special equipment, the test current national standards GB763 recommended 100A DC, can In the case of 100A current directly measured loop resistance or contact resistance, and with a digital display, the instrument measurement accuracy, stable performance, suitable for power supply departments on-site maintenance and high voltage switch high voltage switch factory loop resistance test requirements. First, the technical performance 1, measuring range: 1-1999μΩ Resolution: 1μΩ 2, measuring current: DC 100A 3, measurement accuracy: 1.0, 0.5 4. Display: three half-LED digital display 5, the work: continuous 6, Power: AC220V 7, volume :( L × W × H mm) 480 × 350 × 205 8, weight: 5Kg Second, the principle has been adopted to pay a deposit inverter technology, using pulse width modulation method, automatically adjusting current is and it can be adjusted manually to achieve constant 100A Third, shape structure