Protection control apparatus

摘要

A protection control apparatus includes a control-signal output circuit configured to generate a sampling signal in synchronization with a 1PPS signal and output, as a control signal, data numbers cyclically counted up every time the sampling signal is generated and the sampling signal and a data output unit configured to convert a system electrical quantity into digital data based on the control signal and output the digital data. The control-signal output circuit includes a number-of-clocks calculating circuit configured to calculate a second number of clocks and a third number of clocks and a synchronization control unit configured to calculate a difference between a first number of clocks and a second number of clocks, control a cycle of the sampling signal based on the difference and the third number of clocks, and synchronize generation timing of the sampling signal with the 1PPS signal.

主权项

1. A protection control apparatus comprising a merging unit configured to merge system electric quantities detected in a power system, convert the system electric quantities into digital data, and output the digital data, the protection control apparatus protecting the power system, the protection control apparatus comprising:
the merging unit including:
a control-signal output circuit configured to generate a sampling signal in synchronization with a synchronization signal received from outside and output, as a control signal, numbers cyclically counted up every time the sampling signal is generated and the sampling signal; anda data output unit configured to convert the system electrical quantity into digital data based on the control signal output from the control-signal output circuit and output the digital data, wherein the control-signal output circuit includes:
a number-of-clocks calculating circuit configured to calculate, based on its own clocks of the number-of-clocks calculating circuit, a first number of clocks in time from a minimum to a maximum of the numbers, a second number of clocks in a cycle of the synchronization signal, and a third number of clocks in time from detection of the synchronization signal until the sampling signal is generated; anda synchronization control unit configured to calculate a difference between the first number of clocks and the second number of clocks, control a cycle of the sampling signal based on the difference and the third number of clocks, and synchronize the generation timing of the sampling signal with the synchronization signal.