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Paper Information

Title: 

REDUCTION OF GROUND FAULT LEVEL IN BAHMANI AND POUDAR SUBSTATIONS IN BOUSHEHR

Type: PAPER
Author(s): JAHROMI H.R.,POURMAND M.,KHALEGHI SH.,KARGAR SH.,JADID S.
 
 
 
Name of Seminar: INTERNATIONAL POWER SYSTEM CONFRENCE
Type of Seminar:  CONFERENCE
Sponsor:  SHERKATE TAVANIR
Date:  2004Volume 19
 
 
Abstract: 

REGARDING TO NUMEROUS ACCIDENTS IN 66.11 KV BAHMANI AND POUDAR SUBSTATIONS IN BOUSHEHR, AND INCREASE IN THE NUMBER OF INCIDENTS, THERE IS AN URGENT NEED FOR INVESTIGATION AND EVALUATION OF THESE SUBSTATIONS. INVESTIGATIONS SHOWS THAT BECAUSE OF HIGH SHORT CIRCUIT CURRENT TO EARTH AND DELAY IN CIRCUIT BREAKERS OPENING, THE DAMAGES IN THE ACCIDENTS HAVE BEEN INCREASED. FOR EXAMPLE, IN THE INCIDENT DATED 82/9/12 IN BAHMANI SUBSTATION, SHORT CIRCUIT IN ONE OF THE OUTGOING 11 KV POWER LINES, RESULTED IN FIRE AND APPROXIMATELY TWO BILLIONS RAILS DAMAGES.
IN ORDER TO DECREASE THE NUMBER OF ACCIDENTS, IT IS POSSIBLE TO INSTALL AN COIL OR AN RESISTOR IN THE NEUTRAL (STAR POINT) IN SECONDARY SIDE OF THE POWER TRANSFORMER. ANOTHER SUGGESTION IS TO OPEN THE STAR POINT GROUNDING AND INSTALL A SUITABLE GROUNDING TRANSFORMER. IN THIS ARTICLE, THE ABOVE SUGGESTIONS WERE STUDIED AND ADVANTAGES AND DISADVANTAGES WERE EVALUATED AND THE NECESSARY SIMULATIONS HAVE BEEN PERFORMED. THE RESULT OF SIMULATIONS SHOWS THAT INSTALL OF GROUNDING TRANSFORMER HAS SEVERAL ADVANTAGES, WHICH IN SPITE OF HAVING SOME DISADVANTAGES, STILL IS THE BEST WAY FOR REDUCTION OF GROUND FAULT LEVEL AND PREVENTING OF ACCIDENTS.

 
Keyword(s): SHORT CIRCUIT LEVEL, EARTH FAULT, GROUNDING TRANSFORMER, ACCIDENT, SIMULATION
 
 
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