Introduction of the types of the hottest loop resi

2022-08-10
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Introduction to the types of loop resistance tester

there are many types of loop resistance testers with different uses and a wide range of applications. There are mainly the following categories

single clamp loop resistance tester

performance and characteristics of loop grounding resistance tester: the unique single clamp design can avoid the error of mutual interference between double clamp type two probes. It can be measured directly by clamping without driving auxiliary ground piles. Application and scope of application of grounding resistance meter: zc-8 grounding resistance is suitable for directly measuring the grounding of various grounding devices. Where do you choose to buy Jinan testing machine? The resistance value can also be used for the measurement of general low resistance. The four terminal button (0 ~ 1 ~ 10 ~ 100 Ω specification) can also measure the soil resistivity

grounding impedance tester

ca series clamp type grounding resistance meter series measurement, it is not necessary to use the auxiliary grounding rod, nor interrupt the grounding of the equipment to be tested. As long as the grounding wire or rod is clamped, the resistance to ground can be measured to 0.1 Ω. It can also measure current

universal grounding/insulation resistance tester

there are many test methods: double clamp grounding resistance test, quadrupole grounding resistance test, NASA computer simulation analysis and display, soil resistivity test, insulation resistance test, AC and DC voltage test, current RMS test

loop resistance tester

microprocessor control, with high accuracy and reliability. Check whether the wiring status is correct with three indicator lights. Read the short-circuit protection current and ground fault current directly (4118). It will automatically lock when the test resistance is overheated

digital grounding resistance tester

this tester is specially used to measure the grounding resistance of various electrical equipment, lightning rods and other grounding devices. The product is an all electronic instrument, and the key circuit is assembled from the integrated circuit produced by Texas Instruments. The testing principle is advanced. Vortex flowmeter

double jaw grounding resistance tester

has a variety of grounding resistance measurement methods: no auxiliary pole/three pole/four pole/and pole method ---- suitable for a variety of measurement environments * wide measurement range: 0.002 Ω - 300K Ω ---- meet a variety of requirements

grounding resistance tester

the unique single clamp design and single hand operation can avoid the interference between the two probes of the double clamp type, and there is no need to hit the auxiliary electrode. As long as you clamp the grounding wire, you can measure it in just 3 seconds, and you can directly and quickly measure the resistance value of the grounding circuit

many high current electrical equipment in power system need to accurately measure the resistance value of the circuit in preventive test and handover test. Circuit breaker is an important electrical equipment in the power system. The national standards gb763, gb50150 and the power industry standard dl/t596 all stipulate the measurement of the resistance of the circuit breaker's conductive circuit: it should be measured by DC voltage drop method, and the current should not be less than 100A

the resistance of the conductive circuit of the circuit breaker mainly depends on the contact resistance between the moving and static contacts of the circuit breaker. The existence of contact resistance increases the loss of the conductor when it is energized, and increases the temperature at the contact. Its value directly affects the current carrying capacity during normal operation, and affects the cutting capacity of short-circuit current to a certain extent. Therefore, the resistance value of each phase conductive circuit of the circuit breaker is an important data for the installation, maintenance and quality acceptance of the circuit breaker

There are many methods to measure the contact resistance. Japanese scholar Isao Minowa proposed using superconducting quantum devices to measure contact resistance, Chi proposed using electrolytic cell method to measure contact resistance, and polish scholar Jerzy kaczarek proposed using third harmonic method to measure contact resistance. These methods are generally used in electrical contact research under laboratory conditions. In engineering, the four terminal method is usually used to measure the contact resistance of the actual contact. Previously, DC double arm bridge was usually used to measure the contact resistance of circuit breaker. However, when the double arm bridge is used to measure the resistance of the conductive circuit of the circuit breaker, because the double arm bridge measurement circuit passes through a weak current, it is difficult to eliminate the oxide film with large resistance, and the measured resistance is too large, but the oxide film is easy to be broken down under a large current, which does not hinder the normal current. Therefore, when the DC voltage drop method is used for the test, the current should not be too small

the resistance of the conductive circuit of the high voltage circuit breaker mainly depends on the contact resistance between the moving and static contacts of the circuit breaker. The existence of contact resistance increases the loss of the conductor when it is energized, and increases the temperature at the contact. Its value directly affects the current carrying capacity during normal operation, and affects the cutting capacity of short-circuit current to a certain extent. Therefore, the resistance value of each phase conductive circuit of the circuit breaker is an important data for the installation, maintenance and quality acceptance of the circuit breaker. Due to the oxide film between the switch contacts, if a small current is used for detection, the test result is generally much larger due to the influence of the oxide film, but the oxide film can be broken down under high current. Theoretically, as long as the test current does not exceed the rated current, the larger the better. However, when formulating the regulations, taking into account the production level of relevant domestic instruments at that time, it has made a provision that the current should not be less than 100A. The reliable and effective connection between the grounding down lead of power equipment and the ground is the fundamental guarantee for the safe operation of power equipment and the personal safety of operators. Although the necessary anti-corrosion treatment has been done for the connection of the grounding downlead when making the grounding device, the connection point in the soil will still be affected by humidity and other factors for a long time. The bearing used to support the sample and the indenter used to apply the load will adopt hardened steel point corrosion, disconnection, loosening and other phenomena, resulting in the increase of the resistance between the grounding downlead and the ground contact point, Unable to meet the requirements of various mature technologies that have been introduced to the market and power regulations, there are unsafe hidden dangers in the operation of the equipment, which will cause the equipment to run disconnected in serious cases. It can be used to accurately measure the conduction resistance between the grounding down lead of power equipment and grounding or adjacent equipment. The ground conduction resistance tester is used to measure the conduction resistance value of the grounding downlead, and determine the fault point by comparing the test value over the years and the test value of adjacent points. The working power supply of the ground conduction resistance tester is provided by the internal lithium battery, without external AC power supply. The test process is controlled by the single chip microcomputer. It has the characteristics of simple operation, fast test speed, stable test data, easy to carry, etc

since the contact resistance of the circuit breaker is very small, only high current detection can ensure a certain accuracy, and the stronger the anti-interference ability. It is used for high-precision measurement of contact resistance and current carrying conductor resistance of circuit breaker, and can output large current stably for a long time

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