Design of 33MVA, 69kV/23kV mobile substation for Visayan Electric Company done by FPMTC at Taytay, Rizal, Philippines

Date

6-2016

Degree

Bachelor of Science in Electrical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Kristel Mae V. Villasin

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 study aims to design a 33 MVA 67kV/23kV mobile substation for VECO. The specifications needed were given to FPMTC. The original power requirement of VECO was 25 MVA. A 25MVA, Oil Natural-Air Natural (ONAN), power transformer was first considered for the design. VECO then changed their power requirement to 33 MVA. To be able to reach the necessary MVA rating for the power transformer without using a larger transformer, FPMTC chose to increase the rating of the transformer by applying an Oil forced-Air Forced (OFAF) cooling system. This change increased the impedance of the transformer from 8% to 10.56%. With the increase in impedance, the calculations for the protection was redone. The full load current on both primary and secondary side of the transformer were computed. The proper size of circuit breakers, disconnecting switches and fuse were then chosen accordingly. For the AC auxiliary system, the size of the auxiliary transformer which is connected to the 23 kV side of the main power transformer was computed by listing all the AC loads and applying demand factors to the total AC load. The auxiliary transformer that was used was two 25 kVa 23 kv/240V distributed transformer. The fault analysis was done using the MVA method to check if the appropriate ratings for each equipment were used.

Language

English

Location

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

Call Number

LG 993 2015 E64 /C37

Document Type

Thesis

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