Digital Protection control system and digital protection control apparatus

摘要

Disclosed are a digital protection control system and a digital protection control apparatus, wherein the digital protection control apparatus can easily be made to have more terminals, even when the number of terminals of a power transmission line increases. The digital protection control system has, as terminal stations thereof, a reference station that is to become the reference point for the sampling time at which power grid current information is to be taken in, tail-end stations that take in power grid current information from the power grid system, and intermediate stations that are connected between the reference station and the tail-end stations via transmission paths. The intermediate station is provided with an uplink transmission unit that is connected to a transmission path at the reference station side thereof, and a plurality of downlink transmission units that are connected to transmission paths at the tail-end station side thereof. The intermediate station also has the time thereof to be subordinate to the time of the terminal station connected to the uplink transmission unit thereof, and the time of the terminal stations connected to the downlink transmission units thereof are made to be subordinate to the intermediate station, with the time thereof used as reference time.

主权项

1. A digital protection control system comprising, as terminal stations:
a reference terminal station configured to take system current information and function as a reference of sampling time; a tail-end terminal station configured to take system current information from a power system; and an intermediate terminal station configured to be connected through a transmission path between the reference station and the tail-end station, wherein: the digital protection control system transmits and receives system current information between a plurality of the reference, tail-end, and intermediate terminal stations and performs protection control of the power system; the intermediate terminal station includes an upper transmission unit connected at a reference terminal station side thereof to the transmission path and a plurality of lower transmission units connected to the transmission path at a tail-end terminal station side thereof; and the digital protection system subordinates time of the intermediate terminal station to time of the reference terminal station, which is connected to the upper transmission unit, and subordinates time of at least one of the lower transmission units, which is connected to the tail-end terminal station, to time of the intermediate terminal station.