At present, in power system, the grounding resistance of large grounding grid is mainly measured by power frequency and large current triode method. In order to prevent power frequency interference and improve the accuracy of measurement results, the rules of insulation preventive test stipulate that the test current of power frequency high current method should not be less than 30 amperes. As a result, many problems arise, such as heavy test equipment, complex test process, high work intensity of test personnel, long test time and so on.

HYG-5F earth grid grounding resistance tester can measure multi-purpose machines of substation ground network (4), hydrothermal power plant, microwave station (10) and lightning rod (10). A new type of variable frequency AC power supply is adopted, and measures such as computer processing control and signal processing are adopted to solve the anti-interference problem in the testing process, simplify the test operation process and improve the precision of the test results. The degree and accuracy greatly reduce the labor intensity and test cost of the test personnel.

This instrument is suitable for testing power frequency characteristic parameters such as power frequency grounding impedance of various grounding devices and soil resistivity. The instrument adopts the technology of anti-interference with different frequencies, and can accurately measure the data at 50Hz power frequency under strong interference environment. The maximum test current of 5A will not cause the grounding device potential to be too high during the test. At the same time, it also has strong anti-interference ability, so it can be measured without power failure.

Impedance measurement range: 0-5000_

Resolution: 0.001 M

Measurement error: (+2%+0.01_)

Test current waveform: sine wave

Test current frequency: 45, 50, 55, 60, 65 Hz single frequency

45/55Hz, 55/65Hz, 47.5/52.5Hz automatic dual frequency conversion

Output current: 1, 2, 3, 4, 5A

Maximum output voltage: 450V

Measuring line requirements:

The cross-sectional area of copper core of current wire is more than 1.5 mm 2

Voltage Wire Copper Core Section Area (>1.0mm2)

Power supply: AC180-270V, 50/60Hz

Shape size: 370 *285 *285mm

Instrument weight: 18kg

1. The power frequency equivalence of measurement is good. The test current waveform is sinusoidal, and its frequency is only 5 Hz different from that of the power frequency. It is measured by using 45 Hz and 55 Hz frequencies.

2. Strong anti-interference ability. This instrument adopts the different frequency method to measure, and cooperates with the modern software and hardware filtering technology, which makes the instrument have high anti-interference performance and stable and reliable test data.

3. High accuracy. The basic error is only 0.005_, which can be used to measure large-scale grounding network with small grounding impedance.

4. Powerful function. It can measure grounding resistance of current pile, voltage pile, grounding resistance of grounding grid, conduction resistance and soil resistivity. External special frequency selector can measure step voltage and contact voltage. It can also measure surface potential gradient. It has stronger anti-interference ability and higher precision.

5. Simple operation. All Chinese menu operation, directly showing the measurement results.

6. Small amount of wiring work, no need for large current lines.