Distributed protection system for power distribution systems
First Claim
1. A protection system for a power distribution system having a plurality of breakers arranged in a hierarchy, the protection system comprising:
- a network;
a first breaker of said plurality of breakers coupled to the power distribution system;
a first module coupled to said network and said first breaker at a first level in the hierarchy, said first module sampling an electrical condition of the power distribution system at said first breaker and monitoring said first electrical condition for a predetermined trip condition;
a synch controller coupled to said network, said synch controller broadcasting a time synchronization message to all modules coupled to said network,wherein said first module, upon detection of said predetermined trip condition and receipt of said time synchronization message within a predetermined period of time, trips said first breaker if said first level is a lowest level of the hierarchy, but monitors said network for a first notification message if said first level is not said lowest level of the hierarchy, andwherein said first module, upon detection of said predetermined trip condition and failure to receive said time synchronization message within said predetermined period of time, trips said first breaker regardless of said first level.
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Accused Products
Abstract
There is disclosed a protection system for a power distribution system having a plurality of breakers arranged in a hierarchy. The protection system has a network and a breaker coupled to the power distribution system. A module is coupled to the network and the breaker is at a first level in the hierarchy. The module samples an electrical condition of the power distribution system at the breaker and monitors the electrical condition for a predetermined trip condition. The module, upon detection of the predetermined trip condition, trips said breaker if the first level is a lowest level of the hierarchy, but monitors the network for a notification message if the first level is not the lowest level of the hierarchy.
269 Citations
19 Claims
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1. A protection system for a power distribution system having a plurality of breakers arranged in a hierarchy, the protection system comprising:
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a network; a first breaker of said plurality of breakers coupled to the power distribution system; a first module coupled to said network and said first breaker at a first level in the hierarchy, said first module sampling an electrical condition of the power distribution system at said first breaker and monitoring said first electrical condition for a predetermined trip condition; a synch controller coupled to said network, said synch controller broadcasting a time synchronization message to all modules coupled to said network, wherein said first module, upon detection of said predetermined trip condition and receipt of said time synchronization message within a predetermined period of time, trips said first breaker if said first level is a lowest level of the hierarchy, but monitors said network for a first notification message if said first level is not said lowest level of the hierarchy, and wherein said first module, upon detection of said predetermined trip condition and failure to receive said time synchronization message within said predetermined period of time, trips said first breaker regardless of said first level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for protecting a power distribution system having a plurality of breakers arranged in a hierarchy, comprising:
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sampling an electrical condition of the power distribution system at a first breaker of the plurality of breakers by a first module; detecting a trip condition by said first module based on said electrical condition; detecting receipt of a time synchronization message by said first module within a predetermined period of time; and determining whether a level of said first breaker is a lowest level in the hierarchy, if receipt of said time synchronization message within said predetermined period of time is detected, then tripping said first breaker by said first breaker if said level is the lowest level or monitoring for a notification message if said level is not the lowest level, and if receipt of said time synchronization message within said predetermined period of time is not detected, then tripping said first breaker by said first breaker regardless of said level. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification