The grounding resistance tester is abandoning the traditional manual manual power generation mode. It adopts advanced large-scale integrated circuits and uses DC/AC conversion technology to combine three-terminal and four-terminal measurement methods into a new type of digital grounding. Resistance tester. Applicable to power, post and telecommunications, railway, communications, mining and other departments to measure the grounding resistance of various devices and measure the resistance value of the conductor with low resistance; this meter can also measure the soil resistivity and ground voltage.
Grounding resistance tester is a common instrument for measuring grounding resistance. It is also an indispensable tool for acceptance inspection of electrical safety inspection and grounding projects. Due to the rapid development of computer technology, ground resistance tester has penetrated a large number of grounding resistance testers. Microprocessor technology, its measurement function, content and accuracy can not be compared to the general instrument. The advanced resistance tester can meet all grounding measurement requirements. With the new jaw method, online direct measurement is not required for loading piles. A powerful earth resistance tester is controlled by a microprocessor, which can automatically detect the connection status of each interface and the interference voltage and interference frequency of the ground network. It also has unique features such as value retention and intelligent prompting.
Clamp-type grounding resistance meter is a major breakthrough of the traditional grounding resistance measurement technology and is widely used in grounding resistance measurement of power, telecommunications, meteorology, oil fields, construction and industrial electrical equipment. The clamp-type grounding resistance meter does not need to disconnect the ground down conductor when measuring the looped grounding system, and does not need the auxiliary electrode. It is safe, fast and easy to use. Clamp-type grounding resistance meters can measure ground faults that cannot be measured with conventional methods and can be used in applications where traditional methods cannot measure them, because the clamp-type ground resistance meter measures the combined value of the ground body resistance and the ground lead resistance. Clamp-type grounding resistance meter has long jaws and round jaw points. The long jaws are particularly suitable for flat steel grounding applications.
main effect
1. Accurately measure the grounding impedance, grounding resistance, grounding reactance of large grounding grids;
2. Accurately measure the surface potential gradient of a large grounding grid field;
3. Accurately measure the contact potential difference, contact voltage, step potential difference, and step voltage of a large grounding grid;
4. Accurately measure the transfer potential of large grounding grids;
5. Measure ground lead down resistance;
6. Measuring soil resistivity
Measurement steps
1) Insert two grounded probes in the grounding direction of the grounding body and insert them into the ground 20m or 40m away from the grounding body. The insertion depth is 400mm, as shown in the figure below. Ground Resistance Test Diagram
The ground resistance test uses diagrams: a) Actual operation b) Equivalent principle
2) Place the grounding resistance meter close to the grounding body and perform wiring. The wiring method is as follows:
1 Connect the grounding body to the grounding gauge's terminal "E1" (the three-terminal measuring instrument) or the short-circuited common terminal (the four-terminal measuring instrument) with the shortest dedicated wire.
2 Connect the measuring probe (current probe) of 40m away from the grounding body to the connection terminal "C1" of the measuring instrument with the longest dedicated wire.
3 Connect the measuring probe (potential probe) 20 m away from the grounding body to the terminal "P1" of the measuring instrument with the remaining length of the central conductor.
3) After placing the meter horizontally, check whether the pointer of the galvanometer points to the center line, otherwise adjust the "Zero Adjuster" so that the pointer of the meter points to the center line.
4) Set the "magnification scale" (or coarse adjustment knob) to the maximum multiple, and slowly turn the generator handle (the pointer starts to shift) while rotating the "measuring dial" (or fine tuning) Knob) Point the galvanometer hand to the center line.
5) When the pointer of the galvanometer is close to the balance (the pointer is closer to the center line), rotate the handle faster to make the rotation speed reach 120r/min or more, and adjust the "measuring dial" to make the pointer point to the center line.
6) If the reading of the "measuring dial" is too small (less than 1) to be difficult to read accurately, it means that the magnification scale is too large. At this time, you should set the “scale†to a smaller multiple and readjust the “measuring dial†so that the pointer points to the center line and read out the exact reading.
7) Calculate the measurement result, that is, R = "Magnification Scale" reading × "Measurement Dial" reading.
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