MEWOI8104E Large Grounding Grid Grounding Resistance Tester

  • Main Features:
    Large Grounding Grid Grounding Resistance Measurement
  • Model No.:
    MEWOI8104E
  • Name:
    MEWOI8104E Large Grounding Grid Grounding Resistance Tester
OEM/ODM Testing instruments manufacturer
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INTRODUCTION

Currently in the electric system, the grounding resistance of large grounding grid is mainly measured with the high power frequency current three-pole method. In order to prevent the power frequency interference generated in the operation of the power grid and increase the accuracy of the measuring results, it's stipulated in testing regulations of the insulation prevention that the testing current of the heavy power-frequency current method shall be no less than 30A. And thus many problems emerge, such as heavy testing equipment, complex test procedures, high working strength of the test personnel and long duration.

The grounding resistance tester can measure on the facilities of the grounding grid at the transformer substation (4Ω), hydraulic/heat-engine plant, microwave station (10Ω) and lightening rod (10Ω). New variable frequency power is used and measures like the microcomputer processing controlling and signal controlling are adopted, perfectly solving the issues of interfering prevention in the testing process, simplifying the operation, increasing the accuracy and veracity of the testing results and reducing the labor intensity and testing cost of the testing personnel.

The instrument can be used to measure power-frequency grounding impedance, grounding resistance and the auxiliary instrument and other characteristic parameters of various grounding devices as well as earth resistivity. Pilot frequency anti-resistance technology is applied to the instrument, enabling it to accurately measure the data under the power frequency of 50Hz. The highest testing current is 5A, which would not cause high potential of the grounding device and it has great anti-interference ability, so it can carry out the test with persistent power supply.

MAIN FEATURES

1. Good power frequency equivalence of test. The testing current is displayed in the form of sine wave, of which the frequency is only 5 Hz different from the power frequency. The frequencies of 45Hz and 55Hz are used for test.

2. Strong anti-interference capability. The pilot frequency method is used for test in the instrument, with the modern hardware and software filtering technology, giving the instrument high anti-interference ability with stable and reliable testing results.

3. High accuracy. Its intrinsic error is only 0.005Ω, making it feasible to measure the large grounding grid with little grounding impedance.

4. Powerful function. It is possible to measure current piles, voltage piles, grounding resistance, auxiliary instrument and earth resistivity.

5. Simple operation. Chinese menu-type operation directly shows the measuring results

6. A small sum of labor in wiring and no need of large current line.

TECHNICAL SPECIFICATION

Range of testing for impedance: 0Ω-200Ω Range of testing for impedance: 0Ω-200Ω 
 Resolution ratio: 0.001Ω  Resolution ratio: 0.001Ω 
Measuring error: ±(reading ×2%+0.005Ω) Measuring error: ±(reading ×2%+0.005Ω) 
Anti-interference ability under the power frequency of 50Hz: 10V Anti-interference ability under the power frequency of 50Hz: 10V 
Waveform of testing current: sine wave Waveform of testing current: sine wave 
Frequency of testing current: Dual-frequency of 45Hz, 55HzFrequency of testing current: Dual-frequency of 45Hz, 55Hz
Maximal output current: 5AMaximal output current: 5A
Maximal output voltage: 400VMaximal output voltage: 400V

Requirements of measuring line: Sectional area of copper core of current line is ≥2.0mm2

Sectional area of copper core of voltage line is ≥1.5mm2

Requirements of measuring line: Sectional area of copper core of current line is ≥2.0mm2

Sectional area of copper core of voltage line is ≥1.5mm2

Power supply: AC220V±10%, 50Hz Power supply: AC220V±10%, 50Hz 
Boundary dimension: 440×350×210Boundary dimension: 440×350×210
Weight of the instrument: 10kgWeight of the instrument: 10kg