Paper Information

Title:  AN ALGORITHM FOR DISTANCE PROTECTION OF SERIES COMPENSATED LINES
Type: PAPER
Author(s): RASHIDI MEHRAN,PARNIANI MOSTAFA
 
 
 
Name of Seminar: INTERNATIONAL POWER SYSTEM CONFRENCE
Type of Seminar:  CONFERENCE
Sponsor:  SHERKATE TAVANIR
Date:  2004Volume 19
 
 
Abstract: 

PROTECTION OF SYSTEMS WITH SERIES COMPENSATED LINES IS CONSIDERED TO BE ONE OF THE MOST DIFFICULT TASKS FOR RELAY MANUFACTURERS AND UTILITY ENGINEERS. PROTECTIVE DISTANCE RELAYS, WHICH MAKE USE OF IMPEDANCE MEASUREMENTS IN ORDER TO DETERMINE THE PRESENCE AND LOCATION OF FAULTS, ARE “FOOLED” BY INSTALLED SERIES CAPACITANCE ON THE LINE WHEN THE PRESENCE OR ABSENCE OF THE CAPACITOR IN THE FAULT CIRCUIT IS NOT KNOWN A PRIORI. THIS IS BECAUSE THE CAPACITANCE CANCELS OR COMPENSATES SOME OF THE INDUCTANCE OF THE LINE AND THEREFORE THE RELAY MAY PERCEIVE A FAULT TO BE IN ITS FIRST ZONE WHEN THE FAULT IS ACTUALLY IN THE SECOND OR THIRD ZONE OF PROTECTION. SIMILARLY, FIRST ZONE FAULTS CAN BE PERCEIVED TO BE REVERSE FAULTS! CLEARLY THIS CAN CAUSE SOME COSTLY OPERATING ERRORS. THE GENERAL APPROACH OF INTEREST IS A METHOD LEADING TO THE DETERMINATION OF THE VALUES OF SERIES L AND C OF THE LINE AT THE TIME OF THE FAULT. THIS IS DONE BY ANALYZING THE SYNCHRONOUS AND SUB SYNCHRONOUS CONTENT OF THE V AND I SIGNALS SEPERATELY WHICH PROVIDES ADEQUATE INFORMATION TO COMPUTE THE SERIES L AND C OF THE LINE.

 
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