| |
It applies the controlling, sampling,
data processing of microcomputer and displays by the large
screen of liquid crystal. Testing the large erathing grid
of power plant and substation by the abnormal frequency
keeps high accuracy and stabilized performance; and efficiently
resolves the industrial frequency current-interference.
With only 1～3A testing current and 4kg weight, it greatly
eases the labour intensity during the test.
Output current: AC3A or 5A (it can be
used with computer on-line operation, our recommended
product with high cost performance)
Output voltage: AC0～120V
Measuring range: 0～100Ω～500Ω
Measurement error: ＜1%
Connection: trilinear, four-line
In addition, it provides DER2571A/B（ZC-8）type terrameter
and multifunctional grounding terranmeter with double
jaw, which is suitable for any grounding occasions and
conditions, and proceeds the online measuring of soil
resistivity and circuit connecting resistance. |
|
| |
One. Introduction:
HRWGR Anti-interference Detector of Grounding Resistance
for Earthing Grid in the safe operation of the substation
equipment, plays a very important role. Therefore, our company
based on "power equipment grounding order", "grounding
device-specific parameters in the frequency guide,"
and with substation equipment grounding grid of the actual
situation, the design model developed HRWGR-0.4A,1A,3A /
5A Anti-interference Detector of Grounding Resistance for
Earthing Grid. The instrument uses three-pole method, frequency
method, high-current law the principle advantages of microcontroller
as the core of the intelligent detection system, thus greatly
reducing the large-scale measurement of grounding resistance
in all kinds of interference in the process of measurement
error caused improve the measurement accuracy, can use a
three-pole ground resistance measurement of grounding grid,
but also use the four-probe method for soil resistivity
measurements, the output current is moderate (I ≦ 5A). Simple,
clear interface. Test data quickly, accurately and reliably.
Second, the major technical indicators:
三、Measuring content:
● Power Equipment Grounding Grid Resistance (Ω)
● soil resistivity (Ω ? M)
2. Measuring range:
● Power Equipment Grounding Grid Resistance: 0 ~ 20Ω
● Soil Resistivity: 0 ~ 9000Ω ? M
3. Input Power: 220V ± 10% 50 Hz 3 A / 5A
4. Output voltage and current: 110V 0 ~ 3A / 0 ~ 5A
5. Output frequency: 60Hz 40 Hz dual frequency automatically
6. Measurement accuracy: ± 2% +0.02 Ω Resolution: 0.001Ω
7. Measurement: automatic measurement
8. Instrument Weight: 16kg (including shock box)
9. Display mode: LCD liquid crystal display
10. Printer: EPSON Micro Printer
11. Measurement conditions: ①no power measurement ②temperature:
0 ℃ ~ 60 ℃ ③ Relative humidity: no more than 85%
Third, the main functions and features:
1, the apparatus functional, measurable in net soil resistivity
and ground resistance.
2, using measured frequency 60Hz class, high-precision
frequency-selective use of instruments that can maximize
the frequency and other frequencies to avoid interference,
the measurement easier.
3, apparatus, light weight, small size and portable, the
use of Chinese menus, simple and straightforward man-machine
conversation interface makes operation of the device easier.
|
|
