| 摘要 |
1461487 Transformers; capacitive voltage dividers SIEMENS AG 10 May 1974 [17 May 1973] 20704/74 Headings HIT and H1M A monitoring arrangement comprising a current transformer and/or capacitor for installation in a metal casing 1 of a switchgear 2 comprises an insulating annular assembly flange 11, which is clamped between flanges 5, 6 of the casing. Within the casing the high voltage conductor 7 is surrounded by a metal tube 8 with flared tube components 9, 10 at its ends the components being fastened by adhesive to the tube 8 but insulated from it by layers of insulation (not shown). The flange 11 is fastened to the tube 8 by adhesive and circular seals 12, 13 seal off the casing 1 at the junction point of the two casing components 3, 4. The tube 8 and high voltage conductor 7 form a high voltage capacitor of a capacitative divider, the low voltage capacitor of which is outside the casing 1. In the case of a combined current and voltage transformer element the current transformer cores 14, 16 and applied secondary winding systems 15, 17 are situated on the outside of tube 8 and between the tube components 9, 10 (which act as guard-ring electrodes). In the embodiment of Fig. 2 (not shown) a capacitor element of a capacitative voltage divider has an insulating assembly flange (27) cast integrally with the cylindrical insulating body (28) which carries a laminar electrode (30) on its inner surface nearest the high voltage conductor (29). The low voltage capacitor (36) of the capacitative divider has an amplifier (37) followed by a load connected across its terminals. In another embodiment, Fig. 3 (not shown) of a current transformer element the metal tube (40) is flared out at one end to form an integral assembly flange which is clamped between flanges (44), (45) of casing components (46), (47). The Specification refers to 1,461,486, 1,461,488, 1,461,489 and 1,461,490. |
