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2013•Shaanxi Electric PowerRequires access

Study on Fault Component Differential Protection for Isolated Power System

Dan Hu

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Abstract

For the space restriction in isolated power system,the cable is respectively short.To each level cable.the short current to the beginning and end of line is approximately equal over relay.The traditional time current principle can't satisfied the effective protection.By using longitudinal differential protection method,the generators parallel connection system is simulated in PSCAD/ EMTDC and the differential current protection is experimented in MATLAB.The research shows that the fault component differential protection has good ability against transient resistance,which also can distinguish internal and external faults effectively,satisfy the requirements of the elements(line and bus) effective protection.

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What this paper is about

For the space restriction in isolated power system,the cable is respectively short.To each level cable.the short current to the beginning and end of line is approximately equal over relay.The traditional time current principle can't satisfied the effective protection.By using longitudinal differential protection method,the generators parallel connection system is simulated in PSCAD/ EMTDC and the differential current protection is experimented in MATLAB.The research shows that the fault component differential protection has good ability against transient resistance,which also can distinguish internal and external faults effectively,satisfy the requirements of the elements(line and bus) effective protection.

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Available abstract

For the space restriction in isolated power system,the cable is respectively short.To each level cable.the short current to the beginning and end of line is approximately equal over relay.The traditional time current principle can't satisfied the effective protection.By using longitudinal differential protection method,the generators parallel connection system is simulated in PSCAD/ EMTDC and the differential current protection is experimented in MATLAB.The research shows that the fault component differential protection has good ability against transient resistance,which also can distinguish internal and external faults effectively,satisfy the requirements of the elements(line and bus) effective protection.

Key concepts: Differential protection, Transient (computer programming), Relay, Protective relay, Power-system protection, Fault (geology), MATLAB, Differential (mechanical device)

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