METHOD TO CONTROL THE APPARATUS FOR MEASUREMENT OF ELECTRICAL QUANTITIES THROUGH MEASUREMENT CABLE

摘要

Method of remote control of measuring apparatus for electrical quantities through cable that connects the measuring apparatus with measured object use high frequency current representation of commands with characteristic base frequencies and transfer them using cable that connects measuring apparatus with measured object. Currents are injected and take of using inductive coupling with transformers (402) and (202). Control unit (205) measures base frequencies of received commands and realise them based on measured frequency through decision circuit and turning appropriate switches (204).