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MEDW-3A automatic anti-interference ground resistance measuring instrument
Impedance measurement range: 0-1000 Ω Test current frequency: 45/55Hz, 55/65Hz automatic dual frequency conversion; ※ Output current: 0-3A, output vol
Product details
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At present, in the power system, the grounding resistance of large grounding grids is mainly measured using the power frequency high current three pole method. In order to prevent power frequency interference during the operation of the power grid and improve the accuracy of measurement results, the insulation preventive test regulations stipulate that the test current of the power frequency high current method shall not be less than 3 amperes. As a result, there are many problems such as bulky testing equipment, complex testing processes, high workload of testing personnel, and long testing times.
MEDW-3AAutomatic anti-interference ground resistance measuring instrumentMulti purpose models for measuring substation grounding (4 Ω), hydro thermal power plants, microwave stations (10 Ω), and lightning rods (10 Ω) are adopted. A new type of variable frequency AC power supply is used, and measures such as microcomputer processing control and signal processing are adopted to better solve the anti-interference problem during the testing process. The experimental operation process is simplified, the accuracy and precision of the test results are improved, and the labor intensity and testing cost of the testing personnel are greatly reduced.
This instrument is suitable for testing the power frequency grounding impedance and other power frequency characteristic parameters of various grounding devices, as well as soil resistivity. This instrument adopts cross frequency anti-interference technology, which can accurately measure data at the power frequency of 50Hz in strong interference environments. The test current is greater than 3A, which will not cause the potential of the grounding device to be too high during testing. At the same time, it also has strong anti-interference ability, so it can be measured without power outage.
Performance characteristics of automatic anti-interference grounding resistance measuring instrument
1. The measured power frequency equivalence is good. The test current waveform is a sine wave, with a frequency difference of only 5Hz from the power frequency. Two frequencies, 45Hz and 55Hz, are used for measurement.
2. Strong anti-interference ability. This instrument adopts the frequency difference method for measurement, combined with modern software and hardware filtering technology, making the instrument have higher anti-interference performance and stable and reliable test data.
3. High precision. The basic error is only 0.005 Ω, which can be used to measure large grounding grids with smaller grounding impedance.
4. Powerful functionality. It can measure the grounding resistance of current piles, voltage piles, grounding resistance of grounding grids, conductivity resistance, and soil resistivity.
5. Easy to operate. Fully Chinese menu style operation, directly displaying measurement results.
6. Low wiring workload, no need for high current wires.
◆ Automatic anti-interference grounding resistance measuring instrument product usage
Measure the grounding resistance, soil resistivity, ground voltage, and ground current of the grounding system without power outage; Combined with a power frequency voltmeter, step voltage, contact voltage, and potential gradient on the ground can be measured.
◆ Product performance of automatic anti-interference grounding resistance measuring instrument
1. By using frequency conversion technology, it can resist extremely strong dynamic interference currents, with stable readings and a attenuation suppression ratio of up to 66dB for interference currents. This means that the interference signal in the machine is only 1/2000 of its original amplitude, and a 200A interference current is reflected as an interference amount of less than 0.1A.
2. The super strong anti-interference performance can reduce the test current to (0.1-3) A, greatly reducing the weight of the equipment. It can also measure normally when the auxiliary grounding resistance Rc of the current pole reaches 1k Ω.
3. The indication error caused by a ground interference current of 100A is less than 5%.
4. Used as a testing current source in the testing of ground grid step voltage, contact voltage, and potential gradient.
5. Automatically eliminate the influence of mutual inductance and self inductance of current and voltage measurement leads on testing, resulting in accurate test results and significantly reducing the intensity of on-site wiring work.
6. Automatically display ground interference voltage, current, voltage pole auxiliary grounding resistance, and prompt an alarm when the auxiliary grounding resistance exceeds the limit or is open circuit. Easy to operate, fast testing speed, providing technical support and judgment for on-site wiring issues.
7. It can store 255 sets of test data, provide RS232 or Bluetooth communication function with the computer, facilitate data processing, and can also print test values directly through a micro printer.
Automatic anti-interference ground resistance measuring instrument
Product IntroductionAt present, in the power system, the grounding resistance of large grounding grids is mainly measured using the power frequency high current three pole method. In order to prevent power frequency interference during the operation of the power grid and improve the accuracy of measurement results, the insulation preventive test regulations stipulate that the test current of the power frequency high current method shall not be less than 3 amperes. As a result, there are many problems such as bulky testing equipment, complex testing processes, high workload of testing personnel, and long testing times.
MEDW-3AAutomatic anti-interference ground resistance measuring instrumentMulti purpose models for measuring substation grounding (4 Ω), hydro thermal power plants, microwave stations (10 Ω), and lightning rods (10 Ω) are adopted. A new type of variable frequency AC power supply is used, and measures such as microcomputer processing control and signal processing are adopted to better solve the anti-interference problem during the testing process. The experimental operation process is simplified, the accuracy and precision of the test results are improved, and the labor intensity and testing cost of the testing personnel are greatly reduced.
This instrument is suitable for testing the power frequency grounding impedance and other power frequency characteristic parameters of various grounding devices, as well as soil resistivity. This instrument adopts cross frequency anti-interference technology, which can accurately measure data at the power frequency of 50Hz in strong interference environments. The test current is greater than 3A, which will not cause the potential of the grounding device to be too high during testing. At the same time, it also has strong anti-interference ability, so it can be measured without power outage.
Performance characteristics of automatic anti-interference grounding resistance measuring instrument
1. The measured power frequency equivalence is good. The test current waveform is a sine wave, with a frequency difference of only 5Hz from the power frequency. Two frequencies, 45Hz and 55Hz, are used for measurement.
2. Strong anti-interference ability. This instrument adopts the frequency difference method for measurement, combined with modern software and hardware filtering technology, making the instrument have higher anti-interference performance and stable and reliable test data.
3. High precision. The basic error is only 0.005 Ω, which can be used to measure large grounding grids with smaller grounding impedance.
4. Powerful functionality. It can measure the grounding resistance of current piles, voltage piles, grounding resistance of grounding grids, conductivity resistance, and soil resistivity.
5. Easy to operate. Fully Chinese menu style operation, directly displaying measurement results.
6. Low wiring workload, no need for high current wires.
◆ Automatic anti-interference grounding resistance measuring instrument product usage
Measure the grounding resistance, soil resistivity, ground voltage, and ground current of the grounding system without power outage; Combined with a power frequency voltmeter, step voltage, contact voltage, and potential gradient on the ground can be measured.
◆ Product performance of automatic anti-interference grounding resistance measuring instrument
1. By using frequency conversion technology, it can resist extremely strong dynamic interference currents, with stable readings and a attenuation suppression ratio of up to 66dB for interference currents. This means that the interference signal in the machine is only 1/2000 of its original amplitude, and a 200A interference current is reflected as an interference amount of less than 0.1A.
2. The super strong anti-interference performance can reduce the test current to (0.1-3) A, greatly reducing the weight of the equipment. It can also measure normally when the auxiliary grounding resistance Rc of the current pole reaches 1k Ω.
3. The indication error caused by a ground interference current of 100A is less than 5%.
4. Used as a testing current source in the testing of ground grid step voltage, contact voltage, and potential gradient.
5. Automatically eliminate the influence of mutual inductance and self inductance of current and voltage measurement leads on testing, resulting in accurate test results and significantly reducing the intensity of on-site wiring work.
6. Automatically display ground interference voltage, current, voltage pole auxiliary grounding resistance, and prompt an alarm when the auxiliary grounding resistance exceeds the limit or is open circuit. Easy to operate, fast testing speed, providing technical support and judgment for on-site wiring issues.
7. It can store 255 sets of test data, provide RS232 or Bluetooth communication function with the computer, facilitate data processing, and can also print test values directly through a micro printer.
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