Multipoint simultaneous measurement method and multipoint simultaneous measurement system in electric power station, and internal clock used therefor

摘要

A multipoint simultaneous measurement method and a multipoint simultaneous measurement system in an electric power station and an internal clock used therefor, capable of performing measurement at the correct time even at a place in the electric power station where GPS radio waves cannot be received, and of securing simultaneity with high accuracy and with ease without connecting a plurality of measurement points via a cable and the like.

主权项

1. A multipoint simultaneous measurement method in an electric power station, comprising the steps of:
providing a plurality of measuring devices and a master unit configured to be able to wirelessly transmit/receive a signal to/from the measuring devices; providing an internal clock that is operated by time correcting means having an oscillator contained therein and a counter for counting an output pulse from the oscillator in each of the measuring devices, the internal clock being configured to correct its time by adding a difference between a pulse number that is obtained by multiplying an actual oscillating frequency oscillated by the oscillator by a fixed period of time and a product that is obtained by multiplying a target oscillating frequency by the fixed period of time, to the pulse number at intervals of the fixed period of time, the fixed period of time being a time when the pulse number after a decimal point of the oscillating frequency of the oscillator is rounded to be an integer; synchronizing the internal clocks of the measuring devices by GPS radio waves or by connecting the measuring devices; correcting the internal clocks of the measuring devices continuously at intervals of the fixed period of time from when the internal clocks are synchronized until when measurement is finished; arranging the measuring devices to respective measurement points; transmitting a measurement time from the master unit to the measuring devices; and measuring a predetermined physical quantity by the measuring devices when the internal clocks reach the measurement time transmitted from the master unit, and transmitting measurement data from the measuring devices to the master unit.