Equipment Used For Measuring Resistance and Power

Posted by jeffery cardin on May 11th, 2021

There is much equipment, which are used for measuring resistance, one of such is resistance meter. It is basically it is used to measure and test electrical grounding systems. Because grounding is necessary for providing continuity between conducting objects and earth. There is analog resistance meters, digital resistance meters. Names indicate that the reading shown will be on analog scale for analog meters where as in digital form for digital meters.

Power loggers are used for energy monitoring and studying loads. It is capable of showing results of power parameters, such as harmonics, power factor and captures voltage variations. It also records data regarding power and associated parameters up to 45 days. It measures harmonic distortion caused due to loads, also measures currents in all the three phases and neutral. It shows graphs and give report using software. It performs energy consumption tests to prove benefits of efficiency improvements. It can monitor maximum power demand also. Power loggers are used to verify electrical system capacity, which is required for adding loads. It is used for harmonics measurements, so that harmonic components can be removed, which can damage equipment. It is used for monitoring voltage variations, which causes trouble of circuit breaker tripping.

It is essential for all the electrical systems, to have effective earthing, for safe operation, and it should be regularly checked whether the earthing installations are effective or not. There is a possibility that due to corrosive soil, having moisture can degrade grounded rods and connections. Then, ground resistance value will be increased due to corroded ground rods. Use of Earth resistance testersis made to regularly check the ground resistance. If the resistance is increased, more than 20%, then the technician, investigates the reason behind it and make necessary correction, so that resistance can be reduced. It can be done by either replacing ground rod or by adding another ground rod. There are four things which affect grounding resistance. These are length of the grounding electrode, diameter of the electrode, number of ground electrodes and depth of ground electrode.

Mostly a single ground electrode is used in simple grounding system. If more than one grounding rods are used for grounding then this is complex grounding system. These multiple rods are connected in mesh or grid type of formation. Complex grounding is used in power generating stations, or central offices or mobile tower sites. Complex grounding increases the contact with the earth and hence lowers the ground resistance.

jeffery cardin

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jeffery cardin
Joined: November 25th, 2019
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