大型地網(wǎng)接地電阻測試儀
DWR-Ⅲ型大型地網(wǎng)接地電阻測試儀
一、儀器概述
目前在電力系統(tǒng)中，大型地網(wǎng)的接地電阻的測試目前主要采用工頻大電流三極法測量。為了防止電網(wǎng)運行時產(chǎn)生的工頻干擾，提高測量結(jié)果的準確性，絕緣預(yù)防性試驗規(guī)程規(guī)定：工頻大電流法的試驗電流不得小于30安培。由此，就出現(xiàn)了試驗設(shè)備笨重，試驗過程復(fù)雜，試驗人員工作強度大，試驗時間長等諸多問題。
DWR-Ⅲ型大型地網(wǎng)接地電阻測試儀，可測變電站地網(wǎng)（4Ω）、水火電廠、微波站（10Ω）、避雷針（10Ω）多用機型，采用了新型異頻交流電源，并采用了微機處理控制和信號處理等措施，很好的解決了測試過程中的抗干擾問題，簡化了試驗操作過程，提高了測試結(jié)果的精度和準確性，大大降低了試驗人員的勞動強度和試驗成本。
二、大型地網(wǎng)接地電阻測試儀技術(shù)指標
1、儀器測量范圍：0～15Ω
2、測量精度： 3%
3、測量輸出電流：AC＜3A
4、測量線要求： ≥Φ1.5mm2
5、供電電源： AC220V/50HZ
6、儀器重量： 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
