FR2787939A1 - CUT-OFF SYSTEM INSULATED BY GAS AND SHIELDED ON THREE PHASES - Google Patents

Abstract

In a gas-insulated switching installation, shielded on all three phases, all the installation components such as a current connector, a circuit breaker (4), a combined disconnector / earthing switch (6) and a rail (8) conductors are mounted in a common gas zone inside a cylindrical metal housing (2) one behind the other in the direction (A) of the axis of this housing. In the area of the collector rail, the metal casing is transformed into a cylinder (21) which extends transversely and which is provided at both ends with flanges (22) to immobilize the bulkhead insulators (9) carrying the conductor rail.

Description

i 2787939

  CUT-OFF SYSTEM INSULATED BY GAS AND SHIELDED ON

THE THREE PHASES

  The invention is in the field of energy distribution and can be applied to the conformation of the construction of a gas-insulated switching installation, shielded over three phases, in which several components of the installation are mounted axially one behind the other

  in a metal shielding box.

  The structure of gas-insulated and shielded switchgear depends, among other things, on the nominal voltage at which such systems are operated. While at voltage levels above 150 kV, shielded installations separate from the individual phases are common, shielded installations over the three phases are common for the medium voltage range up to 36 kV. At the lower high voltage level of 72 to 145 kV, shielded installations are used on each

  phase than armored installations over three phases.

  It is customary for both high-voltage circuit-breakers shielded on each phase and for high-voltage circuit-breakers shielded on three phases to make the individual components of the installations such as a collecting rail, a collecting rail disconnector, a switch earthing system, a circuit breaker, a current transformer, a voltage transformer and a cable outlet as individual modules which are provided with a tubular shielding box and which are provided at the ends of the tube and possibly also on the surface side of connection flanges. The interior areas of these modules are separate

  from each other by partition insulators.

  We have also already gone to the stage of mounting in a common gas zone two installation components, such as for example a collector rail and a disconnector and possibly a release switch.

2 2787939

  earth or a circuit breaker and a current transformer (DE 36 21 268 A1, "Elektrie", 1994, notebook 10, pages 368 to 371; "etz", 1994, pages 18 to 23). It is also usual in medium-voltage switching installations to mount more than two components of the installation in a common gas zone delimited by a metal box. In a known breaking installation of this kind (DE 34 36 173 A1), it is mounted one behind the other at a current connection made through a shield crossing, a circuit breaker and a combined disconnector / earthing switch; following the combined disconnector / earthing switch extends transversely to the axis "current connection-circuit breaker-disconnector / earthing switch" a collector rail whose phase conductors are individually supported on the metal housing. In this installation, the movable breaking contact, made as a cutting knife, of each disconnector / earthing switch is connected to a connecting conductor going to the associated circuit breaker; in addition, there is associated with each circuit breaker a drive mechanism extending transversely to the axial position of the components of the installation. This drive mechanism is used to drive a contact piece extending transversely to the axis of the installation, a clean, accessible gas zone.

  separately from the outside, being provided for the circuit breaker proper.

  From a gas-insulated shutdown installation, shielded on the three phases, which comprises several installation components mounted in a metal shielding box and in which a current connection shaped as a shield crossing, a circuit breaker and a combined disconnector / earthing switch are axially mounted one behind the other for each phase in the shielding box and in which extends following the combined disconnector / earthing switch, transverse to the axis "current connection-circuit breaker-switch disconnector / earthing" a collecting rail whose phase conductors are supported on the shielding box, the movable breaking contact of each disconnector / earthing switch being connected to a conductor of connection going to the associated circuit breaker and a drive mechanism extending transversely to the axial position of the components of the tin installation t associated with each circuit breaker, the invention aims to achieve this installation so that it can be used for the lower high voltage level

3 2787939

  (72 to 142 kV) and that it is distinguished at the same time by needs in place

  as small as possible and an ability to be mounted easily.

  According to the invention, this is achieved by the following measures 1. The shielding box 2 is substantially cylindrical and is transformed at the end receiving the collecting rail into a cylinder 21 which extends transversely to the collecting rail and which is provided with two flange ends 22 for securing bulkhead insulators

  discs, carrying 8 phase conductors.

  2. The current connection of the associated circuit breaker is made as a plug connection and is mounted in the head area of a conical isolator 3 mounted at the end on the insertion side of the shielding box, a current transformer and / or a voltage transformer 11 is

associated with the current connection.

  3. The circuit breaker is made in breaking chambers 4 which extend parallel to the axis of the shielding box and which are placed on the

insulators 3.

  4. Each switch 6 disconnector / earthing behaves as

  cut-off element 7 push contact.

  A breaker installation of this kind is distinguished by a common field box for the collector rail, the connector rail disconnector, the service earth, the circuit breaker, the current connection and the transformers, so that the installation switch has only one gas zone without partitioning with respect to the collecting rail. The installation can be mounted in this case standing by having a simple collecting rail located at the top and extending transversely to the axis of the housing. In an embodiment of this kind, the length of the installation is kept small, inter alia by the fact that the current and / or voltage transformers are directly associated with the introduction of cables, that is to say that they are mounted concentrically with respect to the introduction of cables, and by the fact that a combined disconnector / earthing switch is used a switch which includes a pushing contact as the breaking element. Switches of this kind are known per se (DE 196 32 574 A1, DE 198 25 386). A breaking installation produced according to the invention can, in the event of an incident inside a connection panel, be changed by simple

  exchange with a reserve facility.

4 2787939

  As an additional embodiment of a cut-off installation produced according to the invention, provision may be made to mount the isolators and the cut-off chambers which they carry, distributed uniformly over a part of a circle of the shielding box 2. This also gives a triangle arrangement for the circuit breaker, which means that the metal case has a relatively small diameter. It is known per se to have current connections in the form of a conical insulator provided in the head area with a plug connection ("etz" journal, notebook 21, 1998, page 46; DE 36 11 463 A1 ; newspaper "Elektrizitatswirtschaft", 1982, notebook 20, pages 683 to 685, as well as newspaper "Elektrie", 1994, notebook 10, pages 368 to 371). In this regard, it is also known to integrate a transformer of the current connector

  current or a voltage transformer.

  Circuit breakers are also known which are produced in breaking chambers and which extend parallel to the axis of a cylindrical shielding box (DE 35 05 962 C1, DE-Z "Siemens-Energietechnik", 1983, book 6, page 314). Likewise, it is known to connect the cut-off element of these cut-off chambers directly or by means of lever transmission to a drive device mounted coaxially or to a device

drive mounted radially.

  According to an advantageous embodiment of the invention, the current transformer and / or the voltage transformer are placed on the

basic area of the insulator.

  According to an advantageous embodiment of the invention, the current transformer and / or the voltage transformer are integrated into

The insulator of the current connection.

  An example of realization of the new cut-off installation is

shown in figure.

  The cut-off installation 1 shown in the figure comprises a metal shielding box 2 which is produced in a substantially cylindrical manner along an axis A. It is only at the upper end that the metal box is transformed into a cylinder 21 which is placed transversely to the axis A and which is provided with two flanges 22 for connection. It is connected to these connection flanges 22 each time with a partition insulator 9, bushings for the three phase conductors of a collector rail being provided in these

  bulkhead insulators. It is attached to these crossings sections 8 of the

2787939

  conductors, and in fact by positive connection at the left end and by

plugging in at the right end.

  It is associated with each phase conductor of the conductor rail a switch 6 combined disconnector / earthing known per se, the breaking element 7 of which is produced in thrust contact in two parts. It starts from the combined disconnector / earthing switch each time a connecting conductor 6 going to a breaking chamber 4 which represents the circuit breaker proper. Three such interrupting chambers are distributed uniformly over a part of a circle around the axis A of the cylindrical metallic housing 22. They rest for this purpose at their lower end on three conical insulators 3 which are mounted in the base area of the shielding box 2. These insulators 3 are shaped on the inside so as to be able to receive by plugging cable ends or conductor crossings suitably prepared and they therefore have a plug connection which is sealed in the area head and which is connected to one of the poles of the circuit breaker mounted in the breaking chamber 4. Current transformers 10 and / or transformers 11

  are placed on the base areas of the insulators 3.

  There is provided for the driving of the moving parts of the switch in the breaking chambers 4 a driving mechanism 5 in the form of a lever transmission shown diagrammatically which is set in motion at the point D of rotation by a device for drive mounted outside the shielding box 2. The drive mechanism 5 in this case extends transversely to the arrangement of the individual components of the installation 25 provided along the axis A.

6 2787939

Claims (4)

  1. Gas-insulated, three-phase shielded shutdown installation, which comprises several installation components mounted in a metal shielding box, in which a current connection made through the shield crossing, a circuit breaker and a combined switch disconnector / earthing are mounted axially one behind the other for each phase in the shielding box and into which extends, following the combined switch   disconnector / earthing, transverse to the axis "current connection -   circuit breaker-switch disconnector / earthing "a collecting rail whose phase conductors are supported on the shielding box, the movable breaking contact of each switch disconnector / earthing being connected to a connecting conductor going to the circuit breaker associated and a drive mechanism extending transversely to the axial arrangement of the components of the installation being associated with each circuit breaker, characterized in that - The shielding box (2) is produced in a substantially cylindrical manner and is transformed at the end receiving the collecting rail in a cylinder (21) which extends transversely to the collecting rail and which is provided at the two ends with flanges (22) for immobilizing insulators (9) with disk-shaped partitions, carrying the conductors ( 8) phase, - The current connection of the associated circuit breaker is made as a plug connection and is mounted in the head area of a conical insulator mounted at the end of the shielding box located on the input side, - A current transformer (10) and / or a voltage transformer (11) being associated with the current connection, 7 2787939   - The circuit breakers being made in breaking chambers (4) which extend parallel to the axis of the shielding box and which are placed on the insulators (3), - And each switch (6) disconnector / earthing includes as a cut-off element a thrust contact (7). 2. Cut-off installation isolated by gas according to claim 1, characterized in that the insulators (3) and the cut-out chambers (4) which they carry are mounted by being distributed uniformly over a   circle part of the shielding housing (2).   3. Cut-off installation isolated by gas according to claim 1, characterized in that the current transformer (10) and / or the voltage transformer (11) are placed on the base area (31) of the insulator (3).   4. Cut-off installation isolated by gas according to claim 1, characterized in that the current transformer and / or the transformer   are integrated in the insulator of the current connection.