Abstract: In a method for the elimination of the d.c. voltage components of a capacitive a.c. voltage divider whose a.c. measuring voltage which may include a d.c. voltage component, is fed to a measurement transformer, the task is to be solved to remove as quickly as possible the d.c. voltage component of the a.c. measuring voltage also to the greatest extent possible without falsification of the reproduction of the middle or high voltage to be measured. This is achieved in that the a.c. measuring voltage (U.sub.M) is fed to a measuring amplifier (14) by way of two parallel lines (L1, L2) via a d.c. voltage blocking element (6). The a.c. measuring voltage (U.sub.M) is thereby fed directly by way of one line (L1) and the d.c. voltage component (U.sub.G) of the a.c. measuring voltage (U.sub.M) is determined in the other line (L2) in that the a.c. measuring voltage (U.sub.M) is subdivided into such small time sections (t) that an equal number of time sections is coordinated per cycle (T) or half cycle (T/2) and the a.c.

Abstract: A high-voltage current transformer of the head design with a column made of insulating material which supports the head housing. The primary lead is approximately U-shaped, whereby only its horizontal base passes through the central opening of secondary system and at least one of its two legs passes downwardly through a sealing plate in an insulating-medium-tight fashion to outside the space delimited by insulating column, and is contactable from below. The other of the two legs passes through sealing plate in the case of a switchable primary lead likewise downward in an insulating-medium-tight fashion and is directly contactable or in the case of a non-switchable primary is electrically connected to the sealing plate without any holes therethrough. The head housing, designed as hood, also completely encloses primary lead and secondary system from above and is fastened in an insulating-medium-tight fashion to sealing plate.

Abstract: A layer winding for transformers, measuring transformers, choke coils or the like is to be so improved that the insulation of such a layer winding exhibits practically no free spaces in the insulating tape edge areas. This is assured by the method of manufacture in that when reaching the outer end face (12) of a layer winding edge (4), the insulating tape (2) is continued to be wound and the band portion (13) of the insulating tape (2) which projects beyond the edge face (12) is continuously cut off. The remaining residual portion of the insulating tape (15) is then continued to be wound with zero pitch for such length of time until the free spaces which otherwise occur at the layer winding edge (4') are filled out.

Abstract: A method and apparatus for winding ring cores, ring coils, ring core parts or ring coil parts, especially of ring core transformers or ring core measuring transformers, whereby the arrangement includes a winding material storage unit (33) which is moved alternately by means of two transfer mechanisms (20, 21) a distance about the ring core (5). Winding material 51 present on a supply roller (50) is thereby reeled off and wound on the ring core (5). The transfer mechanisms (20, 21) thereby move equally but in opposite directions between two transfer places (U 1, U 2) and are coupled respectively decoupled thereat with respective transfer mechanisms (20, respectively 21). The winding material storage unit (33) is thereby guided as structural unit during each winding through the ring core opening (7) of the ring core (5) respectively ring coil or the like.

Abstract: A coil winding machine with a coil clamping and rotating mechanism for a coil to be clamped-in horizontally which is to be so constructed that the finished-wound coil with great length and/or great weight can be easily removed from above by means of a crane or a trolley hoist and then carried away. This is achieved in that the winding material feed devices (12, 13, 14) are arranged at a common bearer (10) and are pivotally supported together with the bearer about an axis (11) disposed to the rear of the coil rotating axis (15) in such a manner that the transfer or guide rollers (16, 17, 18) are adapted to be pivoted out of the space (20) that exists vertically above the coil (19), and the coil (19) can then be removed vertically in the upward direction.