大型地网接地电阻测试仪   
 
 DWR-Ⅲ型大型地网接地电阻测试仪
一、仪器概述

目前在电力系统中，大型地网的接地电阻的测试目前主要采用工频大电流三极法测量。为了防止电网运行时产生的工频干扰，提高测量结果的准确性，绝缘预防性试验规程规定：工频大电流法的试验电流不得小于30安培。由此，就出现了试验设备笨重，试验过程复杂，试验人员工作强度大，试验时间长等诸多问题。

DWR-Ⅲ型大型地网接地电阻测试仪，可测变电站地网（4Ω）、水火电厂、微波站（10Ω）、避雷针（10Ω）多用机型，采用了新型异频交流电源，并采用了微机处理控制和信号处理等措施，很好的解决了测试过程中的抗干扰问题，简化了试验操作过程，提高了测试结果的精度和准确性，大大降低了试验人员的劳动强度和试验成本。

二、大型地网接地电阻测试仪技术指标

1、仪器测量范围：0～15Ω

2、测量精度：    3%

3、测量输出电流：AC＜3A

4、测量线要求：  ≥Φ1.5mm2

5、供电电源：    AC220V/50HZ

6、仪器重量：    5kg

Large network grounding resistance tester
Number: GD201311150012
Specification: the DWR - Ⅲ type
DWR - Ⅲ large network grounding resistance tester
An overview, instrument
Currently in power system, the grounding resistance of large ground testing at present mainly adopts three very large power frequency current measurement method. In order to prevent grid runtime power frequency interference, improve the accuracy of measurement results, insulation preventive test procedure: big power frequency current method of test current shall not be less than 30 amperes. As a result, there is a heavy equipment test, the process is complex, test personnel working strength is big, test time is long, and many other problems.
DWR network - Ⅲ large earth grounding resistance tester, measurable substation ground network (4 Ω), water and fire power plants, microwave station Ω (10), the lightning rod (10 Ω) multi-purpose machine, adopted a new pilot frequency ac power, and adopts the microcomputer processing control and signal processing, good solve the anti-interference problem in the process of test, simplifies the test operation process, improve the precision and accuracy of test results, greatly reduce the labor intensity of the test personnel and test cost.
Second, the technical indicators
1, the instrument measuring range: 0 ~ 15 Ω
2, measuring accuracy: 3%
3, measurement output current: AC < 3 a
4, measuring line requirement: Φ was 1.5 or higher
5, power supply: AC220V / 50 hz
6, instrument weight: 5 kg