Electrical protection system
First Claim
1. An electrical protection system comprising:
- a first Rogowski coil associated with a primary feeder of an electrical system and operable to sense a primary current in the primary feeder;
a first protection device operable to receive a first current signal from the first Rogowski coil;
secondary Rogowski coils, each associated with a corresponding secondary feeder of the electrical system and operable to sense a corresponding secondary current in the secondary feeder;
secondary protection devices, each operable to receive a secondary current signals from an associated secondary Rogowski coil; and
a communication link operable to transmit the first current signal and the secondary current signals between the first protection device and the secondary protection devices.
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Accused Products
Abstract
Protection systems for electrical systems such as substation power dividers are described. The protection systems may be designed and used to detect and clear faults that may occur within the substation power dividers. For example, a first Rogowski coil may be used to detect current along a primary conductor, and output a corresponding current signal to a multi-function, differential relay having multiple voltage and current inputs. Similarly, additional Rogowski coils may be used at each of a plurality of secondary feeders, where power from the primary feeder may be distributed to the secondary feeders using a connection bus. By comparing the signals from the first Rogowski coil and the additional Rogowski coils, the differential relay may determine whether a fault exists at some point along the conductor(s) and between the first Rogowski coils and the additional Rogowski coils, including whether a fault is associated with the connection bus. Further, the relay may then, in response to the fault, trip a circuit breaker or other network protection device, so that the fault may be corrected.
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Citations
24 Claims
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1. An electrical protection system comprising:
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a first Rogowski coil associated with a primary feeder of an electrical system and operable to sense a primary current in the primary feeder;
a first protection device operable to receive a first current signal from the first Rogowski coil;
secondary Rogowski coils, each associated with a corresponding secondary feeder of the electrical system and operable to sense a corresponding secondary current in the secondary feeder;
secondary protection devices, each operable to receive a secondary current signals from an associated secondary Rogowski coil; and
a communication link operable to transmit the first current signal and the secondary current signals between the first protection device and the secondary protection devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of protecting an electrical system, the method comprising:
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measuring a primary current in a primary feeder of an electrical system using a first Rogowski coil;
receiving at a first protection device, a first current signal generated by the first Rogowski coil;
measuring secondary currents in secondary feeders using corresponding secondary Rogowski coils;
receiving secondary current signals that are generated by the secondary Rogowski coils at corresponding secondary protection devices; and
transmitting the first current signal and the secondary current signals between the first protection device and the secondary protection devices using a communications link. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification