Contact Loop Resistance Tester
Contact resistance tester, switch loop resistance tester, contact loop resistance tester, contact (loop) resistance tester.
The loop resistance tester is a special instrument used for measuring the contact resistance and loop resistance of switch control equipment. The test current adopts the 100A DC recommended by the national standard GB763. It can directly measure loop resistance or contact resistance under the current of 100A, 200A, 300A, 400A, 500A or 600A, and display it directly. It can also save up to 100 groups of data on the instrument. The saved data can be communicated with the upper computer through the RS232 interface, and uploaded to the computer for storage or printing. This instrument has accurate measurement and stable performance, and is suitable for the requirements of on-site high-voltage switch maintenance in power and power supply departments and loop resistance testing in high-voltage switch factories.
Instrument Source
In the power system, conventional double-arm DC bridges are commonly used to measure the DC resistance of transformer coils and the contact resistance of high-voltage circuit breakers. However, the test current of such bridges is only at the mA level, making it difficult to detect defects such as reduced cross-sectional area of the conductor in the transformer coil conductive loop. When measuring the contact resistance of the conductive loop of high-voltage switches, due to the influence of oil film and oxide layer between moving and static contacts, the measured resistance value is several times larger, masking the true contact resistance value. According to "DL / T 845.4-2004 General Technical Conditions for Resistance Measuring Devices of the People's Republic of China Electric Power Industry Standard"
The loop resistance tester specifies that the measurement current for contact resistance of circuit breakers and disconnectors shall not be less than 100A to ensure measurement accuracy.
The loop resistance tester is designed according to the latest electric power execution standard DL/T845.4-2004 of the People's Republic of China, combining high-frequency switching power supply technology and digital circuit technology. It is suitable for measuring the loop resistance of switch control equipment. Its test current adopts the DC 100A recommended by the national standard. It can directly measure the loop resistance under a current of 100A and display it digitally.
Loop Resistance Tester: GroundResistance MeterPurpose and Scope of Application: GroundResistanceSuitable for direct measurement of variousgroundingdevices' ground resistance value, also can be used for general lowresistancemeasurement, four-terminal (0～1～10～100Ω specification) can also measuresoil electricalresistivity. Loop Resistance Tester: Single-clamp Loop Resistance Tester
Single-clamp loop ground resistance tester performance and features: Unique single-clamp design, avoiding the error caused by mutual interference between two probes of double-clamp type. No need to drive auxiliary ground rods, just clamp and measure.
Loop Resistance Tester: Universal Ground/Insulation Resistance Tester
There are many test methods: double-clamp ground resistance test, four-pole ground resistance test, soil resistivity test, insulation resistance test, AC/DC resistance tester voltage test, current RMS test.
Loop Resistance Tester: Ground Impedance Tester
When measuring with the clamp-type ground resistance meter series, it is not necessary to use auxiliary ground rods, nor to interrupt the grounding of the equipment under test. Just clamp the ground wire or rod to measure the resistance to ground up to 0.1Ω. It can also perform current measurement.
Loop Resistance Tester: Loop Resistance Tester
Microprocessor controlled, with high precision and high reliability. Three indicator lights check whether the wiring status is correct. Directly read short-circuit protection current and ground fault current. Automatically locks when the test resistor overheats.
Loop Resistance Tester: Digital Ground Resistance Tester
This tester is specially used to measure the ground resistance value of various electrical equipment, lightning rods, etc. The product is an all-electronic instrument, and the key circuits are assembled with integrated circuits produced by Texas Instruments, USA. The test principle is advanced.
Loop Resistance Tester: Double-clamp Ground Resistance Tester Grounding Device
It has multiple ground resistance measurement methods: no auxiliary electrode / three-pole / four-pole / two-pole method - suitable for various measurement environments, wide measurement range: 0.002Ω—300KΩ - meeting various requirements.
Loop Resistance Tester: Ground Resistance Tester
