Fault identification in electric power transmission systems
AssigneeGeneral Electric Company
InventorsMakeen M. Elkateb, William J. Cheetham
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Abstract
A method of identifying faults in a polyphase alternating current electric power transmission system wherein determination of the type of fault occurring is effected by monitoring, using analogue techniques, the instantaneous values of quantities derived from superimposed currents and/or voltages arising in the system on occurrence of a fault. Apparatus for carrying out the method is also disclosed.
Claims15
A method of identifying faults in a polyphase alternating current electric power transmission system wherein determination of the type of fault occurring is effected by monitoring, using analogue techniques, the instantaneous values of quantities which are combinations of at least two of the group comprising the superimposed currents and the superimposed voltages arising in the system on occurrence of a fault.
A method of identifying faults in a three-phase alternating current electric power transmission system wherein determination of the type of fault occurring is effected by monitoring, using analogue techniques, the instantaneous values of at least some of the quantities I'a-I'b, I'b-I'c, I'c-I'b, I'a+I'b, I'b+I'c, I'c+I'a, V'a-I'b, V'b-V'c, V'c-V'a, V'bc-V'ca, V'ca-V'ab, V'ab-V'bc, I'a+I'b+I'c, V'a+V'b+V'c, I'a+I'b-In, I'b+I'c-In and I'c+I'a-In where I'a, I'b and I'c are the respective phase superimposed currents arising in the system on occurrence of a fault, V'a, V'b and V'c are the respective phase superimposed voltages arising in the system on occurrence of a fault, V'ab, V'bc and V'ca are the respective phase to phase superimposed voltages arising in the system on occurrence of a fault and In is the neutral current arising in the system on occurrence of a fault.
Dependencies are inferred from the claim text.