The resistance tester is an instrument for measuring the electrical conductivity of an object. The resistance tester is widely used in electrical safety inspection and grounding engineering completion inspection and other occasions. There are many types of resistance testers, including ground resistance testers, insulation resistance testers, ground resistance testers, DC resistance testers, surface resistance testers and loop resistance testers.
Introduction Definition
Resistance tester is an indispensable tool for electrical safety inspection and grounding engineering completion acceptance. Including grounding resistance tester, insulation resistance tester, DC resistance tester, surface resistance tester and loop resistance tester. The loop resistance measuring instrument (transformer loop resistance tester) is suitable for testing the contact resistance value of the main contacts of high and low voltage switches and the DC resistance value of high and low voltage cable lines. The intelligent loop resistance tester adopts 100A constant current output. The maximum output voltage reaches 10V (2-3 times of conventional instruments), and the test line with a thin surface can be used, which greatly reduces the labor intensity of field testers. The test process is automatically implemented by single-chip control, with high precision, good retestability, single-button operation, simple and easy to perform, and test data displayed on LCD. Suitable for different working environments. The grounding resistance tester is a common instrument used to check and measure the grounding resistance. Due to the rapid development of computer technology in recent years, the grounding resistance tester has also penetrated a large number of microprocessor technologies. Its measurement function, content and accuracy are not comparable to ordinary instruments. Than.
The DC resistance tester is a new generation of transformer DC resistance tester. It can automatically select the test current according to different types of power transformers and display the test results at the fastest speed. The DC resistance tester has functions such as storage, printing, and discharge indication. It has a built-in non-power-off memory and can store measurement data for a long time. The use of a liquid crystal display makes the instrument with a good man-machine interface and is the first choice for DC resistance testing.
Scope of application
Used for testing conductor conductivity, DC resistance of transformers, motors, transformers and other equipment, equipment grounding resistance, impedance and other occasions.
Instructions
The grounding resistance tester refers to the resistance of the grounding body buried in the ground and the scattered current resistance of the soil. It is usually measured by a grounding resistance measuring instrument (or grounding resistance shaker). The appearance of the type measuring instrument is similar to that of an ordinary insulated shaker, which is also known as the grounding resistance shaker according to the habit. The shape and structure of the model shaker varies slightly with the model, but the method of use is basically the same. The grounding resistance measuring instrument is provided with two grounding probes and three wires. The method of use and measurement steps are as follows:
(a) Ground resistance tester (b) Connection wire (c) Measuring ground rod
1. Disconnect the connection point between the grounding trunk and the grounding body, or disconnect the connection points of all grounding branches on the grounding trunk.
2. Insert two ground rods into the ground 400mm deep, one is 40m away from the ground body and the other is 20m away from the ground body.
3. Place the shaker in a flat place near the grounding body, and then connect the wires.
(1) Use a connecting wire to connect the terminal E on the meter and the grounding body E 'of the grounding device.
(2) Use a connecting wire to connect the terminal post C on the meter and the ground rod C '40m away from the ground body.
(3) Use a connecting wire to connect the terminal P on the meter and the ground rod P '20m away from the ground body.
4. According to the grounding resistance requirement of the grounding body under test, adjust the coarse adjustment knob (there are three adjustable ranges).
5. Shake the watch evenly at a speed of about 120 rpm. When the hands are deflected, adjust the fine adjustment dial until the hands are centered. The reading after adjusting with the fine-tuning dial is multiplied by the positioning multiple of coarse adjustment, which is the grounding resistance of the ground body under test. For example, the fine adjustment reading is 0.6, and the coarse adjustment resistance positioning multiple is 10, then the measured ground resistance is 6Ω.
6. In order to ensure the reliability of the measured grounding resistance value, the orientation should be changed and the re-testing should be carried out. Take the average of several measured values ​​as the grounding resistance of the grounding body.
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