Loop resistance testers and DC resistance testers both play important roles in the field of power testing, but there are significant differences between them. Here's a detailed comparison of the two testers:
1. Function positioning
① Loop resistance tester:
It is mainly used to measure the resistance value of conductive loops of electrical equipment such as high-voltage switches and circuit breakers to determine their contact conditions and safety.
It is widely used in preventive tests and handover tests of high-voltage switches, circuit breakers and other equipment in power systems.
② DC resistance tester:
It is used to measure the DC resistance value of electrical equipment such as transformers, motors, cables, etc. to evaluate the conductive properties of its windings, coils and other parts.
It is widely used in factory testing, preventive testing of transformers, and resistance value measurement of motors, cables and other equipment.
2. Testing principle
① Loop resistance tester:
Usually the four-wire method or the two-wire method is used for testing. During the four-wire method test, the test current and voltage are introduced and drawn out through two independent wires to eliminate the influence of the resistance of the test wire itself on the results and improve the test accuracy.
The test current range is large and can be measured directly under the condition of 100~600A current.
② DC resistance tester:
Apply a constant DC current and measure the voltage drop across the object being measured to calculate its DC resistance.
The test current range is small, usually measured at 1/3/5/10/30A.
3. Application scenarios
① Loop resistance tester:
It is suitable for measuring the loop resistance of switch control equipment, especially when large current measurement is required.
It plays a key role in the preventive test and handover test of the power system to ensure that the equipment has good contact, safety and reliability during normal operation.
② DC resistance tester:
It is more used for factory testing of transformers, preventive testing and resistance value measurement of motors, cables and other equipment.
Provide important data support for equipment operation and maintenance, and help evaluate the conductive performance and health status of equipment.
4. Technical characteristics
① Loop resistance tester:
The test speed is fast, the accuracy is high, and the operation is easy.
The LCD screen can display the test results and save the data automatically.
Suitable for measurement of various grounding equipment.
② DC resistance tester:
It has wide measurement range, good stability and strong anti-interference ability.
With five-digit LCD digital display, provides clear readings.
Adapt to various complex testing environments to ensure the accuracy and reliability of measurement results.
In summary, there are significant differences between loop resistance testers and DC resistance testers in terms of functional positioning, testing principles, application scenarios, and technical features. Users need to choose appropriate testing instruments based on actual needs when purchasing and using them to ensure test accuracy and reliability.
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