Various methods of measuring grounding resistance

This article mainly explains various measurement methods of grounding resistance. China Hardware Business NetworkChina Hardware Business NetworkChina Hardware Business Network
First, the grounding resistance precision measurement method

The precision measurement grounding resistance is connected by three wires. After the auxiliary grounding rod and test line are connected, switch the function to measure the resistance R mode. Press the “TEST” button to start the measurement. The LED indicator flashes during the measurement, and the LCD counts down. After the measurement is completed, the measurement is completed. The indicator is off and the LCD displays the measured value.

Starting from the object to be measured, the auxiliary grounding rods are inserted into the ground every 5 to 10 meters, and the grounding test lines (red, yellow, and green) are connected to the auxiliary current poles from the H, S, and E interfaces of the meter. H, auxiliary voltage pole S, grounded electrode E to be measured. As shown:
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Second, the simple method of measuring the grounding resistance method

This method is a simple measurement method without using an auxiliary grounding rod. The existing grounding electrode with the lowest grounding resistance value is used as the auxiliary grounding pole, and two simple test leads are connected (that is, the H and S interfaces are shorted).

The metal ground pipe, fire hydrant and other metal burial materials, the common grounding of the commercial power system or the lightning protection grounding pole of the building can be used instead of the auxiliary grounding rods H and S. When measuring, the oxidation of the joint point of the selected metal auxiliary grounding body should be removed. Floor.

Grounding resistance simple test wiring as shown below, other operations are the same as precision measurement.
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The simple method measures the grounding resistance, and the meter reading is the sum of the grounding resistance of the grounded body to be measured and the grounding resistance of the commercial grounding body, namely:

RE=RX+re

Where: RE is the meter reading value;

RX is the grounding resistance value of the grounded body to be tested;

Re is the grounding resistance value of a common grounding body such as a commercial power system.

Then, the grounding resistance of the grounded body to be tested is:

RX=RE-re

Use a simple method to measure the grounding resistance, try to select the grounding body with a small re value as the auxiliary grounding pole, so that the meter reading is closer to the true value. When measuring, please choose metal water pipe and fire hydrant as auxiliary grounding pole.

Third, double clamp method to measure the grounding resistance value

The double clamp method is suitable for measuring the situation of an independent multi-point grounding system. As shown in the following figure, in the multi-point grounding system, it is not necessary to ground the pile to measure the grounding resistance value, and the two current clamps A and B are simultaneously clamped into the grounded down conductor to be tested. The two current clamps must be oriented in the same direction and the spacing should be greater than 30 cm. The two current clamps must not be interchanged, otherwise an error will occur. China Hardware Business Network
Press the red “TEST” button to start the test. After the test is completed, the stable data is displayed, that is, the grounding resistance of the grounded body is R=Re+R1//R2//R3, when R1//R2//R3ES3002 double clamp This method is only available for the multi-function grounding resistance tester (multi-function type).
Fourth, the grounding resistance meter measurement application

How to measure the grounding resistance of a house? How to measure soil resistivity? How to measure the grounding resistance of street lamps? How to measure the transformer grounding resistance? How to measure the grounding resistance of the tower?
Five, grounding resistance meter product introduction list China Hardware Business Network Product model: ES3000 Product name: (multi-function) digital grounding resistance tester Features: Function: grounding resistance measurement, ground voltage measurement, low value resistance measurement, resistance range: 0.01Ω~3000Ω, voltage range: 0~ 100V AC, measurement method: precision three-wire measurement, simple two-wire measurement, USB interface: with USB interface, software monitoring, storage data can be...[detailed] China Hardware Business Network Product model: ES3001 Product name: (multi-function) four-wire grounding resistance tester Features: Function: 2, 3, 4 line measurement of grounding resistance, soil resistivity; grounding voltage, AC voltage measurement, grounding resistance: 0.00Ω ~ 30.00kΩ , soil resistivity: 0.00Ωm ~ 9999kΩm, measurement method: precision 4-wire, 3-wire method measurement, simple 2-wire measurement grounding resistance, USB interface......[detailed] China Hardware Business Network Product model: ES3002 Product name: (multi-function) double clamp multi-function grounding resistance tester Features: Function: grounding resistance, soil resistivity, DC resistance, grounding voltage, AC current, resistance range: 0.01Ω~30.00kΩ, Soil resistivity (ρ): 0.00Ωm~9999kΩm, grounding voltage: AC 0.00~100.0V, AC current: AC 0.0mA~1000A, measuring method: precision......[detailed] China Hardware Business Network Product model: ES3010 Product name: (simple) digital grounding resistance tester Features: Function: grounding resistance measurement, ground voltage measurement, low value resistance measurement, resistance range: 0.01Ω~3000Ω, voltage range: 0~600V AC, measurement method: precision three-wire measurement, simple two-wire measurement, line voltage: AC 600V or less measurement, data storage: 500 groups......[detailed] China Hardware Business Network Product Model: ES3010E Product Name: (Simple) Grounding Resistance Soil Resistivity Tester Features: Function: 2, 3, 4, line measurement of grounding resistance, soil resistivity; grounding voltage measurement, resistance range: 0.00Ω ~ 30.00kΩ automatic change File, soil resistivity: 0.00Ωm~9999kΩm automatic shifting, grounding voltage: 0.00V~600V, using voltage: AC 600V or less, measuring......[detailed]
Six, case news

2015-9-24 China Railway 11th Bureau uses ES3000 grounding resistance meter site map
2015-8-18 Guangzhou Power Supply Bureau of China Southern Power Grid uses ES3001 soil resistivity grounding resistance meter site map

Seven, related articles

The specified value of the grounding resistance value of various industries

To purchase a digital ground resistance tester or consult more about grounding measurements. QQ or dial http://news.chinawj.com.
CN Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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