Measuring the variation of ground resistivity with a megger
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Measuring the variation of ground resistivity with a megger

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Published by U.S. Govt. print. off. in Washington .
Written in English


  • Electric resistance

Book details:

LC ClassificationsTN1 .U6 no. 440
The Physical Object
Paginationii, 16 p.
Number of Pages16
ID Numbers
Open LibraryOL6721184M
LC Control Number28026592

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Ensuring an effective earth system is essential in a telecommunications system, and Megger is expert in earth testing having been there right from the start. These days, Megger offers top-end systems for design and soil surveys as well as tough, easy-to-use testers for field engineers. Getting Down To Earth A practical guide to earth resistance testing US $ GBP £ 12/2/05 AM Page 1 Distributed by. Ground resistance testing covers the testing of earth electrodes and the measurement of soil resistivity. Megger offers top end systems for design and soil surveys as well as tough easy to use testers for field engineers. We have tried to make the testers self checking as much as we can, to allow you to concentrate on collating and. also the level of ground noise, indicating the status on the display. They also include a voltmeter to enable measurement of ground voltage. The DET4TD2 and DET4TR2 can measure resistance. from ohms to 20 kΩ, while the DET4TC2 and DET4TCR2 can measure resistance from ohms to kΩ, a key capability for soil resistivity testing. Also.

2. Prospecting for good (low resistance) “ground” locations, or obtaining measured resistance values that can give specific information about what lies some distance below the earth’s surface (such as depth to bedrock). It is not the intent of this manual to go too deeply .   In this paper, soil resistivity and ground resistance at two different sites near an electrical substation are measured using a grounding system grid with and without rods. With the Wenner four-pole equal-method, the soil resistivity is measured at both selected sites, one of which contains wet soil while the other contains dry soil. Cymgrd simulation software is then used to determine the. The Megger insulation tester is a small, portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. For good insulation, the resistance usually reads in the megohm range. The Megger insulation tester is essentially a high-range resistance meter (ohmmeter) with a built-in direct-current generator. procedures for ground measuring techniques. A few of the techniques that are discussed are the measuring of resistance to remote earth for a single earth electrode or for an entire earth electrode system, and also the resistivity of the local soil using an earth system tester. 1. Introduction A good grounding system (also known as an earth.

Ground resistance depends on grounding electrode selection, soil resistivity, soil contact, and other factors. The. 62% Method (aka Simplified Fall of Potential Test) is one way you can measure the ground resistance at your site. This test requires a 3-point ground resistance tester such as AEMC's or Ground Resistance Tester. To. Ground resistance tests (as opposed to resistivity) can be performed with only three terminals, and some testers, to be more economical, have only three terminals. To perform soil resistivity tests, you must have a 4-terminal model. Megger® offers four models: DET4TD2, DET4TR2, DET4TC2, and DET4TCR2. These four models differ only in power. Use a digital multi-meter to measure the resistance of your electrical system. Zero Ohms indicates no resistance to the passage of electrons from one point to another. Since electricity seeks to move along the path of least resistance to the ground, measuring the Ohms of your grounding system will give you a sense of its overall safety. Measuring earth resistance with fall of potential method (photo credit: ) This method is generally not suited to large earthing installations, as the stake separations needed to ensure an accurate measurement can be excessive, requiring the use of very long test leads (refer to Table 1).. Normally, the outer test electrode, or current test stake, is driven into the ground 30 to