DE2211304A1 - SUMMARY CURRENT CONVERTER - Google Patents

Description

1! HOVfM, ΒΟΥΠΠί & CE - AKTIENGESELLSCHAFT

Mp »no. 519/7 2 'Mannheim, March 1, 1972

PAT - Eb / Br

Summation current transformer
The invention relates to a summation current transformer for a

! Residual current circuit breaker with a closed magnetic core
and at least two windings for one to be monitored
Circuit. . ■ =

A summation current transformer for a residual current circuit breaker

! to achieve sufficient sensitivity and host j

economic efficiency should be interpreted in such a way that even with a rej

relatively small residual current in the total current windings a j

sufficiently large power is delivered to a release element j. To ensure this, the iron core cross-section must!

its permeability and the number of turns of the windings j

Chosen sufficiently large for the circuit to be monitored j

■

j will be. The windings must correspond to the rated current of the |

j devices are designed to be sufficiently strong. This is available to the be j

strive to make switching devices as small, simple and j

j cheap to manufacture. ·

j It has proven to be useful and is - customary - the iron

j cores of the summation current transformer as toroidal cores and from a high-!

j to produce permeable material. With this high quality j

! ί

j material, it is particularly important for economic reasons!

that the core can be made with small dimensions. i

; It is now very difficult to find wires with larger |

: To wind cross-sections on a relatively small toroidal core, j

even if only a few, e.g. two turns per main power line!

are to be attached. Already when making the second turn;

the wire must be severely deformed several times. There is the j

Risk of damage to the paint insulation. The manufacture j

309837/0680

BATH ORIGINAL

the winding requires considerable time and special skills. It does not succeed, or only with difficulty, close to the core produce adjacent windings. When using round wire, the difficulties are considerable. It's nice attempts have been made to overcome the difficulties by using |

To diminish flat wire. But this did not lead to any satisfaction!

TÖW3T / T6 8Ö "

BAD OfIiGtNAL

with the result, especially with larger cross-sections, e.g. [ at 4 ram "and more, because the necessary forces cannot always be applied with the j hands. When used The disadvantage of flat wire is that it can only be bent more easily in one direction, bending in other directions and a twist, however, opposes very high mechanical resistance. Production is therefore also possible with flat wire a summation current converter, especially with more than two main current windings, complex and difficult. the Windings of the main lines are not tight against the core, I. a larger space must be provided for the converter in the residual current circuit breaker, the overall dimensions of the device. j are enlarged unfavorably.

The invention was based on the object of a summation current converter to provide the type mentioned with windings that can be wound with little power requirement, a favorable Shaping and adaptation of the wires to the transformer core and thus a favorable use of the winding room and the equipment room enable, also enable a toroidal core with minimal dimensions.

The solution to the problem brings according to the invention a winding wire, which consists of several juxtaposed and common of Plastic coated individual wires. The favorable properties of such a winding wire result from

that the section modulus is considerably smaller than that of a round wire with the same cross-section or a flat wire with the same cross-section and the same bandwidth.

- 3 - 22113OA

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; The difference with regard to the torsion is even more favorable ability, because here it is not the material values of the conductor metal ι as with flat wire, but only the elasticity of the covering material, that is, of a plastic, are decisive.

The connection and sheathing of the individual wires can be different V / can be done. For example, single wires can be used that have a "bakable" lacquer layer, so that an adhesive bond between the individual wires is achieved by heating. The plastic casing can then also j as a tube, e.g. as a shrink tube over the one another

connected wires are pushed.

In a further development of the invention, the wires are disconnected in a manner particularly suitable for series production in a machine parallel to each other and continuously overmoulded with plastic. This can also be blank Wires are used so that only the plastic sheath has to be removed for stripping.

Two application examples of the invention are shown in the drawing. ·. '

Show it:

1 and 2 each show a cross section through an inventive Winding wire.

j In both figures there are four conductors 1, e.g. made of copper, next to each other arranged. In Fig. 1, the conductors 1 are each surrounded by a lacquer insulation 2, in Fig. 2 they have Single wires no such. A plastic sheath 3 encloses the individual conductors in both cases. In the example after

1, the envelope 3 has approximately the same I at all points
Wall thickness, in the example according to FIG. 2, the spaces between the individual wires 1 are completely filled with plastic. ■

309837/0680

BAO ORIGINAL

Claims (3)

Claims .J Summation current transformer for residual current circuit breakers with a closed magnetic core and at least two windings for a circuit to be monitored, characterized in that the windings are formed from a winding wire which consists of several individual wires (1) arranged next to one another and jointly covered by plastic (3). 2. Ribbon wire according to claim 1, characterized in that the individual wires (1) have a lacquer insulation (2) and the common plastic casing (3) by overmolding is made with a thermoplastic material. 3 0 9 ß 3 7/0 6 8 0