Electrical transmission or interconnection systems – Plural supply circuits or sources – Connecting or disconnecting
Reexamination Certificate
2007-05-02
2011-12-20
Deberadinis, Robert L. (Department: 2836)
Electrical transmission or interconnection systems
Plural supply circuits or sources
Connecting or disconnecting
C307S087000
Reexamination Certificate
active
08080902
ABSTRACT:
Distributed generation systems incorporate a distribution network and typically a number of distributed generators. It is possible that power islands may be created in substations incorporating a generator when that substation and generator is isolated from the distribution network by a circuit breaker. A problem arises when the power island is re-connected to the distribution network when the phase of electrical power supply in the previous power island is not synchronized with the power supply on the distribution network. Identifying such an out of phase nature is achieved utilizing application of test reactances, both capacitative and inductive, across the whole distribution network such that such test reactances are substantially unbalanced within a particular substation and in particular a distribution path for a generator so that there is a test reactance load imbalance which will identify out of phase operation and therefore control activation of the circuit breaker.
REFERENCES:
patent: 0 677 911 (1995-10-01), None
Jang et al., “An Islanding Detection Method for Distributed Generations Using Voltage Unbalance and Total Harmonic Distortion of Current,”IEEE Transactions of Power Delivery, vol. 19, No. 2, Apr. 2004, pp. 745-752.
Schultz et al., “Islanding Detection in Germany: Current Standards and Development,”17thEuropean Photovoltaic Solar Energy Conference, Munich, Germany, Oct. 22-26, 2001, pp. 520-523.
Deberadinis Robert L.
Oliff & Berridg,e PLC
Rolls-Royce PLC
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