LU82374A1 - GAS OR LIQUID-INSULATED MEDIUM VOLTAGE SWITCHGEAR, IN PARTICULAR FOR VOLTAGES FROM 1-36 KV - Google Patents

Description

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The invention relates to a medium-voltage switchgear system with circuit breakers or circuit breakers and several outlets, creating a so-called cheap switch, for which there is a great demand as a mass article.

It is known that the individual 3-phase components, such as load switches, busbars and cable connections, both as fully insulated individual poles and in a common measurement

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housing metallic housings, which can then be combined to form a system. As a variant, the principle can also be used for one-piece execution of several outlets.

To create an even more reliable switchgear that is easier to test and maintain beforehand, a medium-voltage switchgear with load or circuit breakers and multiple outlets has already been developed, in which the switchgear is housed in the front part of the encapsulation, which can be unscrewed from one part, and both parts contain a gaseous or liquid insulating medium during operation.

It is known to use electronegative gases, compressed air or liquids as an insulating medium for high-voltage systems, and here z. B. SFg in plants - 2 - “2 -4 especially for voltages from 100 kV, but the use of e.g. B. SFg in the medium-voltage sector not yet known.

According to designs of the medium-voltage switchgear already developed, it is provided individually or in combination that the switching devices can be coupled to the fixed part via plug contacts and the housing halves O-ira assembled state are screwed together by means of two flanges, between which there is a medium-tight ring that in the part a built-in earthing switch, the fixed contact of which is formed by the current path of the lower or, if necessary, the upper plug contact, is arranged, that the busbar is arranged in the fixed part and connected directly to one of the fixed contacts, that optionally with external solid insulated Protect the busbar from these outgoing feedthroughs into the insulating medium of the system, that at least one built-in capacitive voltage transformer is arranged in a medium-tight manner in the fixed part, that the fixed part of each connection lead-through of the outlet is designed in such a way that either for the connection Ö Oil-insulated (wet) or dry cables can be used so that the fixed part is designed so that, if necessary, a fuse carrier can be coupled, the fixed connection area of which is in - 3 - • - 3 - * t

Isolation medium is located, and that in the switching devices, the drive required for the movement of the movable contacts, for. B. in the form of a spring force accumulator, is arranged outside the part of the system containing the insulating medium.

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The invention is based on the object of improving the already developed medium-voltage switchgear in such a way that a direct galvanic connection to the cable connection lead-through creates possibilities for cable testing without opening the space containing the gaseous or liquid insulating medium.

This object is achieved in that a capacitive voltage divider z. B. is arranged in the area of the cable connection bushing.

fS This measure advantageously enables a voltage test to be carried out by installing a capacitive voltage divider or a measuring pin.

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Further advantageous refinements and important, in particular constructive features of the invention are characterized in the subordinate claims.

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An embodiment of the invention is explained in more detail with reference to the drawing; show in it:

Fig. 1 the insulating part attached to the metallic housing wall in section / “v \ n n i - 5 - * 4” -5.-

2 shows the insulating part with the inserted; capacitive voltage divider section and t, Fig.3 the insulating part with inserted measuring pin «in section.

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As Fig. 2 shows * is the z. B. made of silicone rubber capacitive voltage divider 11a fixed with the help of the screw 11a 'in a controlled insulating part 11.

The joint 3 'is pressed tightly by the screw connection 11a'.

The shut-off insulating part 11 is connected to the metallic housing wall 10 'via the screw connection 11'. attached and, as shown in Figures 1 to 3 ^ sealed by the seal 12 '.

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The capacitive voltage divider 11a and the insulating part 11 are conical.

1 shows, in particular, a galvanic connection point 4 'and a voltage connection 5' are provided on the inside at the tapered end of the insulating part 11.

As shown in FIG. 2, the voltage divider 11a has a contact 4'1 at one end and a measuring point 6 'for the voltage test at the other end.

The voltage divider 11a used can be removed from the insulating part 11, the galvanic connection point 4 'becoming free.

Thus, as a further possibility of voltage testing, a measuring bolt 7 'can be used in the disconnected insulating part 11 (FIG. 3) f which is designed externally with its conical part like the voltage divider 11a and whose joint is also tightly pressed by the screw connection 11a'.

Claims (10)

1. Medium voltage switchgear with load or circuit breakers and several outlets, in which the switching device is housed in the front part of the encapsulation which can be unscrewed and both parts contain a gaseous or liquid insulating medium during operation, characterized in that p that a capacitive voltage divider (11a) e.g. B. is arranged in the area of the cable connection bushing. (Luxembourg) - 2 - A 4 - 2 - 2. Switchgear according to claim 1, characterized gekennzc j paves that the capacitive voltage divider (11a) with the screw v (11a ') in a tinted Tsolier ’tei.1 (11) is attached. n 3. Switchgear according to claim 1, characterized in that the joint (3 ') is pressed tightly by the screw (11a'). 4. Switchgear according to claim .1, characterized in that the disconnected insulating part (11) on the screw (11 *) on the ft metallic housing wall (10 ') and that a seal (12') is provided. -3- * 'Λ * t 5. Switchgear according to claim 1, characterized in that the capacitive voltage divider t (11a) and the insulating part (11) fc I 'are conical. p 6. Switchgear according to claim 1, characterized in that at the tapered end of the insulating part (11) inside a galvanic connection point (4 ') and outside a voltage connection. (51) are provided. 7. Switchgear according to claim 1, characterized in that the voltage divider (11a) has at one end a .Contact (4 ") and at the other end a measuring point (61) for the * voltage test. -4-.-4- % 8. Switchgear according to claim 1, characterized in that for the voltage test the capacitive voltage divider (11a) used is removed from the insulating part (11), the galvanic connection point (4 ') being free. 9. Switchgear according to claim 1, characterized in that in the shut-off insulating part (11) a measuring bolt (7 *) can be used, which on the one side is designed like the voltage divider (11a) and is fastened via the screw connection (11a1) . » 10. Switchgear according to claim 1, characterized in that • t that a gaseous or liquid insulating medium is contained in the interior (13 '). -5 -