Adaptive Impedance Relay With Composite Polarizing Voltage Against Fault Resistance

As the conventional relay usually takes the bus voltage as a polarizing voltage, its operating characteristic is fixed and cannot adapt to fault resistance. To enhance the capability against fault resistance, based on the compensated voltage changing with fault resistance, a kind of adaptive impedan...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2008-04, Vol.23 (2), p.586-592
Main Authors: Liu, Q.K., Huang, S.F., Liu, H.Z., Liu, W.S.
Format: Article
Language:English
Subjects:
Adaptive relaying
Applied sciences
Boundaries
Connection and protection apparatus
Digital relays
Disturbances. Regulation. Protection
Electric potential
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
extremely high voltage (EHV) transmission lines
Faults
Impedance
impedance measurement
mho relay
Miscellaneous
Planes
Polarization
Power networks and lines
power system faults
Power system protection
Power system relaying
Power transmission
power transmission faults
Power transmission lines
power transmission protection
Protective relaying
Relay
resistance
Trajectory
Voltage
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Summary:As the conventional relay usually takes the bus voltage as a polarizing voltage, its operating characteristic is fixed and cannot adapt to fault resistance. To enhance the capability against fault resistance, based on the compensated voltage changing with fault resistance, a kind of adaptive impedance relay with composite polarizing voltage is presented in this paper. On the other hand, the operating boundary of the adaptive relay may enter into an ldquoinphaserdquo area along with the increase of fault resistance. To prevent the adaptive relay from maloperation in the ldquoinphaserdquo area, a new additional blocking component is also proposed. Both the adaptive relay and the blocking component were all analyzed in the voltage plane and the impedance plane. Theoretical analyses show that both of them have circular characteristics with greater resistive tolerance. The performance of the relay has been demonstrated on a two-source 500-km line 750-kV system.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2007.916021