HVG-B Earth network ground resistance tester

I Instrument Overview

At present, in the power system, the ground resistance test of the earth network is mainly measured by 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 the measurement results, the insulation preventive test regulations stipulate that the test current of the power frequency high current method shall not be less than 30A. As a result, many problems such as bulky test equipment, complicated test process, high work intensity of test personnel, and long test time have arisen.

The earth network ground resistance tester uses a new variable frequency AC power supply, and adopts microcomputer processing control. HVG-B The earth network ground impedance tester and signal processing measures have solved the anti-interference problem during the test. The test operation process is simplified, the accuracy and accuracy of the test results are improved, and the labor intensity and test cost of the test personnel are greatly reduced.

HVG-B Earth network ground impedance tester is a special instrument for measuring the ground continuity between the ground network ground resistance and the ground point. The instrument adopts frequency conversion anti-interference technology, which does not require large current measurement. It can measure accurate data of 50Hz in the strong interference environment of the substation. The measurement result is displayed on the large-screen liquid crystal. The built-in micro printer can print the output. The instrument can measure the grounding resistance and the grounding resistance at the same time, which can better reflect the actual characteristics of the ground network.

Ⅱ   the functional characteristics

1. The measured power frequency equivalence is good. The test current waveform is a sine wave with a minimum frequency difference of 0.1Hz and a maximum of 10Hz. It can be used for measurement at two frequencies of 50hz or 60hz.

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

3. High measurement accuracy. The basic error is only 0.005Ω, which can be used to measure earth networks with very small ground impedance.

4. Powerful. Can measure current pile, voltage pile, ground network impedance, ground resistance, ground continuity, soil resistivity, etc.

5. Full touch LCD display, super large graphic operation interface, each process is very clear and clear. Operators can use it without additional professional training. The test can be completed with a touch.

6. Equipped with a calendar chip and large-capacity memory, the results can be saved at any time. You can view the history at any time and print it out. The current time and storage time can be displayed and printed.

7. Scientific and advanced data management: instrument data can be exported through U disk, and can be viewed and managed by any software on any PC. Ability to generate reports and test reports

8. Safe and reliable. The instrument has ground protection, current and voltage limiting protection, sound and light alarm and other functions to ensure the safety of test personnel and equipment.

9. With vector test function, it can measure the impedance of the ground network and the pure resistance of the ground network. It can measure the impedance angle.

10. The wiring labor is small, and no large current line is needed.

11. All-in-one model, with standard resistance and constant current source, convenient for on-site testing and reduced on-site wiring.

12. The instrument is easy to operate and the measurement process is controlled by a microprocessor. As long as a suitable measurement method is selected, data measurement can be automatically completed under the control of a microprocessor.

Ⅲ  the technical indicators

1. Measuring range: 0 ～ 5000Ω (including impedance of current pile)

2. Resolution: 0.001mΩ

3. Measurement error: ± (reading × 2% + 0.005Ω)

4. Resistance to 50Hz voltage interference: 10V

5. Test current waveform: sine wave

6. Test current frequency: single frequency: 40-70Hz, resolution 0.1Hz   Random Setting

                                      Dual frequency: 50 ± 0.1Hz to 50 ± 10.0Hz  Random Setting

                                                             60 ± 0.1Hz to 60 ± 10.0Hz    Random Setting

7. Output current: 5A or external power supply 30A

8. Output voltage: 400V or 1000V external power supply

9. Measurement line requirements: The cross-sectional area of the copper core of the current line ≥ 1.5mm2

Cross-sectional area of copper core of voltage line ≥1.0mm2

10. Test power: Built-in 2kW variable frequency power supply or external high-power variable frequency power supply.

11. Power supply: AC220V ± 10%, 50Hz

12. Dimensions: 500mm * 377mm * 330mm Instrument weight: 20kg

Ⅳ  the instrument principle

1. R0 loop resistance is about 5 ～ 200Ω

2. Rx test resistance is about 0 ～ 200Ω

3.Rf standard resistance

4. Measuring current line D: the length is 3 to 5 times of the diagonal of the ground network; wire diameter: ≥1.5mm2

5. Measuring voltage line 1: length is 0.618D; wire diameter: ≥1.0mm2

6. Measuring voltage line 2: Connected to the ground network

7. Measuring ground wire: grounding grid

FAQ:

1. When can I get the price?

We usually quote within 6 hours work time after we get your inquiry. If you are very urgent to get price, please call us or tell us in your email so that we will regard your inquiry priority.

2. What about the delivery time for production?

Honestly, it depends on the order quantity and the product. Usually our leading time is within 7 working days after order confirmation.

3. What is your payment terms?

We accept EXW, FOB, CFR, CIF, DDU, ect. You can choose the one which is the most convenient and cost effective for you.

4. How much will the Shipping cost and time be?

This will depend on size of your goods and method of shipping (by sea/ by air/by Express) and your designated seaport or airport. We will be grateful if you can spare us some minutes to evaluate the cost based on the information of product.

5. Could you please tell me the Warranty Period of your product?

Our warranty period is one year free and lifelong maintenance. If the product is damaged (if not man-made damage), in the first year,we will send free parts for replacement. Over warranty, maintenance is paid service.

6. Do you have Technical Backup to all customers from different countries?

To be sure,our technical support is always available and quick response.
We are manufacturer with much on-site testing experience, thus we know how to deal with your problems. Moreover, our engineers can go to your country to support if needed.