OPERATION DEVICE FOR PROTECTIVE CONTROL

PURPOSE:To reduce the size of an operating unit and to eliminate phase shift of data by providing a single sample holder for a plurality of AC input channels and arranging a means for correcting the phase shift of sampling data at the pre-stage of the holder. CONSTITUTION:Analog filters AF1-AFn are provided corresponding to AC signal input channels CH1-CHn and phase correction circuits PS1-PSn are arranged at the output thus correcting phase shift of AC signal caused by sampling timing shift of a single sample holder SH. When a single sample bolder is employed regardless of the number of input channels, the size of the device can be reduced and the phase shift of sampling data can be eliminated.