Earth (Ground) resistance test used by the National Grid Corporation of the Philippines (NGCP)

Date

2011

Degree

Bachelor of Science in Electrical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Roderick L. Catriz

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Abstract

Earth (Ground) resistance testing is one of the crucial tests done in any power system. National Grid Corporation of the Philippines (NGCP) maintains their substation grounding systems and conducts resistance testing in the ground conductors of all their equipment in a particular substation. For this purpose, a portable earth tester called Megger Digital Earth Tester (DET 2/2) was employed by the company‟s maintenance and testing division. The step-by-step procedures from setting up the instrument according to the method to be used to operating the instrument were discussed in detail. Results from this testing were subjected to the company‟s standard limiting criteria for ground resistance. Resistance measurements that were conducted using fall-of-potential method and slope method were differentiated according to their treatment, reliability, and applications. Using the resistance values from numerous points within a substation, the division visualizes the condition of the entire grounding system. For failed measurements, the maintenance division executes bonding resistance test and ground grid integrity test to support the claim of resistance testing. As proven deficient, the grounding earth of the equipment is chemically treated or the grounding conductor is supplemented by adding grounding conductors to lower the resistance level.

Language

English

LC Subject

Electric currents--Grounding, Electronic measurements

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993 2011 E64 E44

Document Type

Thesis

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