Title :
Scheme for accelerated trip for faults in the second zone of protection of a transmission line
Author :
Deshu, Chen ; Pei, Liu ; Hua, Peng ; Hope, G.S. ; Malik, O.P.
Author_Institution :
Dept. of Electr. Power Eng., Huazhong Univ. of Sci. & Technol., China
fDate :
4/1/1989 12:00:00 AM
Abstract :
A principle of trip acceleration which reaches to the end of the protected line in a multizone impedance protection is described. An impedance unit with zero sequence current as the polarization value which meets performance requirements against over-reach onto the next transmission line, has been developed. The difficult case where the next transmission line is short is discussed. Test results with a prototype device on a dynamic power system model verify the proposed principle. An operational prototype which has been installed on a 110 kV, 60 km transmission line is described
Keywords :
power system protection; power transmission lines; 110 kV; multizone impedance protection; transmission line; trip acceleration; zero sequence current; Acceleration; Circuit breakers; Circuit faults; Delay effects; Impedance; Power system protection; Power transmission lines; Protective relaying; Prototypes; Transmission lines;
Journal_Title :
Power Delivery, IEEE Transactions on
