Means of changing the rating of a current transformer, with several different rated outputs, intended to supply a receiving electrical apparatus such as a meter

摘要

These means comprise, in addition to a common terminal (c), which is always conducting, of the secondary winding of each current transformer (T1, T2, T3), on the one hand, in association with each rated output (a, b, c) of each secondary winding, a normally conducting terminal (1a to 1c, 2a to 2c, 3a to 3c) and, downstream from this terminal, an electrical link (C1, C2, C3) with the other outputs of the same winding, downstream of their associated normally conducting terminal and, on the other hand, a set of cut-off members (15, 15', 15'') able to render all the normally conducting terminals of this winding non-conducting, bar one, namely that in use, and these cut-off elements (15, 15', 15'') being configured in such a way as to make it impossible to put in place a supplementary cut-off element when there are already in place as many cut-off elements as this secondary winding includes normally conducting outlet terminals (1a to 1c, 2a to 2c, 3a to 3c) bar one. IMAGE