Patent ID: 7518529

Claim:
A monitoring device ( 1 ) for monitoring the electrical properties of a medium voltage overhead line ( 3 ) in a medium voltage network, the monitoring device comprising means to measure the electrical properties of the medium voltage line and means to communicate the measured electrical properties to a control centre computer of the medium voltage network; the monitoring device comprises three separate measurement sensors ( 2 a , 2 b , 2 c ), each measurement sensor being adapted for direct and electrically insulated connection onto a separate medium voltage overhead line ( 3 a , 3 b , 3 c ); each measurement sensor having means to measure ( 4 ) the electrical properties of its respective medium voltage overhead line; each measurement sensor having means to communicate ( 6 ) with at least one of the control centre computer and another measurement sensor, at least one of the measurement sensors having means to communicate with the control centre computer; and in which the three measurement sensors further comprise a master sensor and two slave sensors, each of the slave sensors having means to communicate data to and from the master sensor and the master sensor having means to communicate with the control centre computer.