KD3030 Digital Geodetic Network Tester

Digital large-scale ground grid testerAlso known as power frequency grounding resistance tester, grounding resistance meter, etc., it is a commonly used instrument for inspecting and measuring grounding resistance. It adopts a new type of variable frequency AC power supply, dual frequency measurement technology, ultra large touchable color screen, and microprocessor technology to meet the impedance requirements of two-wire, three wire, and four wire tests. At the same time, it can measure parameters such as soil resistivity, step voltage, distributed potential, contact voltage, and current phase angle. Suitable for telecommunications, power, meteorology, computer rooms, oil fields, power distribution lines, iron tower transmission lines, gas stations, factory grounding grids, lightning rods, etc., in compliance with the standards for testing instruments for power substations and lightning protection devices. The characteristics of instrument testing include speed, simplicity, stability, and reliability.

Digital large-scale ground grid testerOutput ZUI high open circuit voltage up to400V， ZUI high short-circuit current can reachThe microprocessor control and automatic dual frequency technology can accurately measure and calculate under strong interference conditions50HzThe grounding impedance value under power frequency state is displayed on the large screen at a glance. Simultaneous storage100Group data, resistance measurement range:0.000Oh!2000Ω. Measurement data can be printed out through a thermal printer.

Digital large-scale ground grid testerComposed of a host, testing line, grounding rod, etc., it has functions such as historical data reading, viewing, saving, and printing.

IIDigital large-scale ground grid testerRange and technical specifications

IIIDigital large-scale ground grid testerPacking List

The current poles for testing the power frequency characteristic parameters of the grounding device should be arranged as far away as possible, and the wiring method is shown in the following figure.

G - tested grounding device; C - Current pole; P - potential pole; D - length of the diagonal of the tested grounding device;

DCE - distance between the current pole and the center of the tested grounding device; DPE - the distance between the potential electrode and the edge of the tested grounding device.

(1) Straight line methodUsually, the distance dCE between the current electrode and the tested grounding device should be 4 to 5 times the diagonal d of the tested grounding device; For the wiring of ultra large grounding devices, overhead lines can be used as current and potential lines; When it is difficult to lay the line at a long distance, it can be taken as 2d in areas with uniform soil resistivity and 3d in areas with uneven soil resistivity. The straight-line distance dPE between the potential pole P and the edge of the tower foundation is taken as 0.6dCE.

(2) Angle methodUsually dCE is taken as 3D~4D, dPE is slightly smaller than dCE, and the angle θ between the current line and the potential line is usually 30 °~45 °; If the soil resistivity around the grounding device is relatively uniform, dCE can be taken as 2D, and the angle between the current line and the potential line is 30 °, dCE = dPE。

Note:

It should be avoided to arrange the potential and current poles used for testing on the radiation of the grounding device, and they should not be wired in the same direction as the radiation extension line of the grounding device.
When the measured value of grounding impedance is found to have a significant increase or decrease compared to previous test results, the arrangement direction of current and potential poles should be changed, or the discharge distance should be increased, and the test should be repeated.
The testing circuit should avoid rivers, lakes, and road intersections as much as possible; Try to stay away from underground metal pipelines and running power lines as much as possible, avoid running parallel to them in long sections, and cross them vertically when crossing.
In any testing method, the distance between the current line and the potential line should be kept as far as possible to reduce the influence of mutual inductance between the current line and the potential line.

After connecting the test line, press the "Grounding Resistance Mode" button to enter the grounding resistance test mode. Press the "Left and Right" keys to set the test current value and frequency. Press the "Test" key to perform the test. After the countdown to the test is completed, the screen displays parameters such as grounding impedance, grounding resistance value, test voltage value, current phase angle, current arc, and current magnitude. After the test is completed, press the "Print" key to print, or press the "Store" key to store the test data. Press the "Exit" key to return to the main interface.