3
The ground network earth resistance tester adopts a new variable frequency
AC power supply, and adopts a microcomputer to control the earth network ground
resistance tester and signal processing. It solves the anti-interference problem during the
test and simplifies the test operation process. , Improve the accuracy and accuracy of the
test results, greatly reduce the labor intensity of the test personnel and test costs.
The ground network earth resistance tester adopts a new variable frequency
AC power supply is a special instrument for measuring the grounding resistance of the
earth grid and the ground continuity between the grounding points. The instrument
adopts frequency conversion anti-interference technology, does not need high current
measurement, and can measure accurate data of 50Hz in the strong interference
environment of the substation. The measurement results are displayed by the
large-screen LCD, and the built-in micro printer can be printed out. The instrument can
measure ground impedance and ground resistance at the same time, which can more
truly reflect the actual characteristics of the ground network.
III.Functional features
1. The measured power frequency equivalence is good. The test current waveform is a
sine wave, the minimum difference between the frequency and the power frequency is
0.1 Hz, and the maximum is 10 Hz. It can be used for measurement at 50hz or 60hz.
2. Strong anti-interference ability. This instrument adopts different frequency method to
measure, and cooperates with modern software and hardware filtering technology, so
that the instrument has 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 the earth network with very small ground impedance.
4. Powerful function. It can measure current piles, voltage piles, ground grid impedance,
ground resistance, ground continuity, soil resistivity, etc.
5. Full touch LCD screen, super large graphic operation interface, every process is very
clear. Operators can use it without additional professional training. The whole process of
Summary of Contents for HZDW-DB
Page 27: ...25...