Method and apparatus for signal coupling at medium voltage...

H - Electricity – 04 – B

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H04B 3/56 (2006.01) H02J 3/00 (2006.01)

Patent

CA 2177282

An electricity supply network comprises a plu- rality of intermediate voltage switching and trans- former substations (11-1 to 11-3,12-1 to 12-3) con- nected together by underground cables. Each cable (22A, 22B) comprises at least one inner conductor and an outer sheath which is connected to the sub- station housing (20A, 20B). A PLC communication system comprises a plurality of transducers (23A, 23B) coupled to the cables at the substations. Each transducer is located on the side of its cable remote from the sheath connection to the substation hous- ing, whereby the transducer is coupled to both the sheath and the conductor(s) of the cable. We have found that signals are adequately coupled to the ca- ble conductors despite the shielding effects of the sheath. (The prior art technique requires the end of the sheath to be isolated from the housing and earthed by an earthing strap connected to the end of the sheath which is brought back through the transducer to the housing to effectively decouple the sheath from the transducer).

Un réseau électrique comprend plusieurs sous-stations de commutation et de transformation d'une tension intermédiaire (11-1 à 11-3, 12-1 à 12-3) reliées par des câbles souterrains. Chaque câble (22A, 22B) comporte au moins un conducteur interne et une gaine extérieure raccordée au boîtier de sous-station (20A, 20B). Un système de communication par réseau électrique comprend plusieurs transducteurs (23A, 23B) couplés aux câbles dans les sous-stations. Chaque transducteur est situé du côté de son câble éloigné du raccord de la gaine au boîtier de sous-tension, ce qui permet de coupler ce transducteur tant à la gaine qu'au(x) conducteur(s) du câble. Nous avons constaté une bonne transmission des signaux aux conducteurs de câbles malgré l'effet de blindage de la gaine. (La technique actuelle exige que l'extrémité de la gaine soit isolée du boîtier et mise à la terre par une bande de mise à la terre raccordée à l'extrémité de la gaine qui est ramenée au travers du transducteur vers le boîtier, pour découpler efficacement la gaine du transducteur).

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