A substation grounding system design for Pili Drive, Forestry, Silangan, and Kanluran substation in UPLB

Date

5-2016

Degree

Bachelor of Science in Electrical Engineering

Major Course

Major in Power Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Karen-Christian C. Agno

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

The maximum allowable touch potential for a person with a weight of 50 kg is 716.59 V while for a 70 kg person, it is 969.87 V. Magnitudes beyond that will result to ventricular fibrillation or cardiac arrest when electrocuted. The step potential is up to 2316.13 V and 3134.76 V, respectively, for people weighing 50 kg or 70 kg. The tolerable touch and step potential values are at those levels when the soil resistivity in the campus is 50 Ω-m and when a 0.08 m thick layer of gravel is added as surface material. With the grounding grid buried 0.5 m below grade, the theoretical maximum touch voltage, step voltage, and ground resistance of the grounding design for Pili Drive substation, using a 38 mm2 ground conductor size, is 219.4124 V, 300.7737 V, and 2.6297 Ω, respectively. For the Forestry substation, the same parameters, in the same order, are equal to 203.7421 V, 273.4209 V, and 2.4452 Ω for Silangan and Kanluran substations, 200.6479 V, 244.9777 V, and 2.2856 Ω, respectively. The maximum touch and step voltages that are indicative of the design?s safety, or the lack thereof, are all less than their respective maximum allowable values which frees a 50 kg person, or heavier, from the threats of ventricular fibrillation. The ground resistances that are indicative of the design?s adequacy as a fault current path are also less than the 5 Ω maximum ground resistance for distribution substations which mean that the designs form an effective low-impedance path.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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