DE3421265A1 - SWITCHGEAR - Google Patents

Description

Popp, Sajda, v. Bülow, Hrabal & Partner

Patent Attorneys European Patent Attorneys'

Munich ■ Bremen *

Popp, Sajda, v. Bülow, Hrabal & Partner, Postfach 8606 24, D-8000 Munich

Applicant :

Mitsubishi Denki Kabushiki Kaisha 2-3, Marunouchi 2-chome, Chiyodaku,

Tokyo, Japan

Dr. Eugen Popp Dipl.-Ing., Dipl.-Wirtsch -Ing Wolf E. Sajda Dipl.-Phys.

Dr. Tarn v. Bülow Dipl.-Ing., Dipl.-Wirtsch.-ing.

Dr. Ulrich Hrabal Dipi.-Chem.

Erich Bolte Dipi.-ing: ·

OFFICE MUNICH / MUNICH OFFICE:

Widenmayerstraße 48 Postfach / P.O.Box 860624 D-8000 Munich 86 Telephone: (089) 222631 Telex: 5 213 222 epod Facsimile: (08 "» 221721

Your sign Yourref.

Your letter of Your letter of

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M / SOG-93-DE

date Date

June 07, 1984 vB / ha

Switching device

Priorities:

June 10, 1983, Japan, No. 104382/1983, August 10, 1983, Japan, No. 147490/1983, October 20, 1983, Japan, No. 197772/1983.

description

The invention relates to a switching device according to the preamble of claim 1 and in particular to a switching device that is particularly suitable for an energy network.

A typical energy network or energy distribution The system consists of a ring or circular energy distribution network that is connected to an electrical source is. The network contains in series with one another

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switched switching devices, the switch groups for the distribution of electrical energy to any energy having consuming system associated therewith. Basically, conventional switching devices have two load switches for closing and opening the power distribution network as well as a mains feed switch connected between the load switches. The load switches are in series with one another in the ring-shaped circuit, with at least one pair of the load switches is always closed to deliver electrical energy through the mains feed switch to the load. If in If there is any problem with the distribution network, the load switches can be selectively opened or closed in order to obtain the desired energy distribution.

A conventional switching device also has an energy fuse connected in series with the mains supply switch, to protect the load-side equipment.

If any problem occurs in the load-side system, the power fuse in the switching device melts through and opens the circuit. The melted or blown fuse can open afterwards of the mains supply switch can be replaced by a new fuse, the mains supply switch by means of a closed earthing switch is earthed. If a problem arises in the ring-shaped network, so can the load switches are selectively opened or closed. This ensures that the loads are energy received from the power source through the grid.

In the conventional switching devices, protection of an overloaded area is difficult and remote control is impossible because the mentioned performance backup is used. Because air is used as the main insulation medium becomes, the structure is quite voluminous and sensitive to surface contamination.

The present invention is therefore intended to provide a switching device which has the disadvantages described above of conventional switchgear avoids.

The object of the invention is to improve the switching device of the type mentioned so that none Power backup is required so that the disadvantages caused by this backup are eliminated.

Accordingly, it should no longer be necessary in the switching device of the invention to have power fuses to replace; however, reliable electrical insulation and the overall dimensions should be ensured of the switching device should be smaller.

The specified object is achieved by the features specified in the characterizing part of patent claim 1. Beneficial Refinements and developments of the invention can be found in the subclaims.

The switching device according to the invention, which is in an energy network is used, has two load switches for connecting and disconnecting a power distribution circuit; a mains feed switch that is connected between the two load switches and electrical Supplying energy; an operating mechanism for operating the switches; and as a special feature that the mains supply switch is a vacuum switch. The switching device can still be a hermetically sealed one Have housing in which the circuit breaker and the vacuum interrupter are contained, the housing with is filled with an electrically insulating gas.

In the following the invention is based on an exemplary embodiment explained in more detail in connection with the drawing. It shows:

1 is a circuit diagram of a power distribution system;

Fig. 2 is a circuit diagram of the switching device according to the invention;
5

3 is a front view of the switching device according to the invention;

FIG. 4 is a side view of the switching device of FIG. 3; 10

5 shows a partial view of an actuating mechanism for coupling the load switches and the disconnector in a position in which both the load switch and the disconnector are open will;

Fig. 6 is a view similar to FIG. 5 in a position in which the load switch is closed and the Disconnectors are closed; 20th

FIG. 7 is a view similar to FIG. 5 in a position in which the load switch is open and the disconnector are closed immediately after the circuit breaker for movement in the open position has been released.

Reference is first made to FIG. 1. There is schematically a typical, ring-shaped energy distribution system shown. An annular energy distribution system 10 is via a power transformer 12 with Energy supplied, with one side of the transformer having a (not shown) electrical energy source and the other side of the transformer 12 to a circuit breaker 14. The ring-shaped power distribution network 10 has several switching devices 16, which with their input connections 18 are interconnected in series in a loop. The outputs 20 of the respective switching devices 16 are with

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several loads 22 connected via the load side Transformers 24.

As can be seen from FIG. 2, the switching device 16 consists of a hermetically sealed housing 26. This Housing 26 is filled with an electrically insulating gas, for example with SFg gas. A pair of source-side connecting conductors 30 and 32 is connected with its respective ends to the inputs 18 and extends through the housing 26. A load-side connection conductor 34 is at one end connected to the outlet 20 and protrudes through the housing 26 in a hermetically sealed manner. The other Ends of the source-side connecting conductors 30 and are connected to circuit breakers 36 and 38, respectively, which are connected in series with one another via a connecting conductor 40. The load switches 36 and 38 have one earth connection 42 and 44 respectively. The load-side connection conductor 34 is connected to its other, inner one End connected to the connecting conductor 40, namely between the two load switches 36 and 38. This connection is made via a mains supply switch 46, the a circuit breaker 48 and a vacuum switch 50, the latter in series with the circuit breaker lies. The isolating switch 48 has a ground connection 52. The switching device 16 also contains a Operating mechanism 54 with which the various switches 36, 38, 48 and 50 in the switching device 16 in the desired operating positions are brought.

When, with the arrangement described above, the movable contacts of the switches 36 and 38 are in their closed position were moved and the isolating switch 48 and the vacuum switch 50 of the power supply switch 46 are closed electrical energy is generated from the ring-shaped energy distribution system 10 via the transformer 24 directed to load 22. When the moving contacts of switches 36, 38 and 48 are connected to earth terminals 42,

and 52, respectively, their respective movable contacts are connected to ground, respectively Connected to earth. With this connection it should be pointed out that the vacuum switch 50 is only then closed should be closed if the circuit breaker has previously been closed, d. H. after the moving contact of the circuit breaker 48 has been connected to the connecting conductor 40 or the ground connection 52.

Since the present invention uses a vacuum interrupter instead of a power fuse, it is not necessary to replace a fuse after a conductor in such a fuse has blown; a remote-controlled reset mode of operation is also accordingly possible. Since reliable electrical insulation is also provided, the overall dimensions of the switching device can be smaller. A wide range of electrical currents can be interrupted by the vacuum interrupter. Since all components i ⁿ a hermetically sealed housing that is filled with electrically insulating gas, are housed, a reliable insulation is obtained; the service life of the switching device is also extended.

Figures 3 and 4 show an example of a three-phase switching device 16 constructed in accordance with the invention. The switching device 16 has a hermetically sealed Housing 26, which with electrically insulating gas, such as. B. SF ^ gas is filled. The walls of the housing 26 support electrical feedthroughs 60 and 62 through which the source-side connecting conductors 30 and, respectively 32 protrude, as well as an electrical bushing 64 for the load-side connection conductor 20. Die Ends of the load-side connection conductors 30 and 32 within the housing 26 are provided with movable contact arms or blades 66 and 68 which are held in pivot bearings 70 and 72, respectively. The movable contact blades 66 and 68 have insulated actuation rods 74

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and 76, which in turn are connected to actuating levers 78 and 80, which are connected to actuating shafts 82 and 84 are mounted. By actuating the shafts 82 and 84 by the actuating mechanism 54, the movable contact blades 66 and 68 between a closed position as shown in FIG. 3 in which the blades 66 and 68 with contact elements on the connecting conductor 40 are in communication, and a grounded position in which the movable contact blades 66 and 68 of the Connection conductor 40 separated and in contact with the Earthing connections 42 and 44 are available, can be switched over, the connecting conductor 40 is via an insulator 86 in held in the housing. The ground connections 42 and 44 are also supported by a suitable support (not shown) held firmly in the housing. In the closed position, the source-side connecting conductors are 30 and 32 are connected to one another via the contact blades 66 and 68 and the connecting conductor 40. In the grounded In position, the source-side connecting conductors 30 and 32 are connected to earth. The movable contact blades 66 and 68 can also be positioned in an open position in which the movable contact blades 66 and 68 both from the connecting conductor 40 and from the ground connections 42 and 44 separated and thus stand between the closed and the earthed position.

The switching device 16 according to the invention also has the isolating switch 48, which has a movable contact blade 88 which is connected to the actuating mechanism 54 so that the blade 88 selectively moves can be that they are around a shaft 90 between a closed position shown in FIG. 3, an open Position and a grounding position can be rotated.

The operating mechanism 54 has an operating shaft 91 which, when rotated, a movement of the Disconnector 48 causes. In the closed position shown, there is a contact element of the

Bonding Conductor 40 Engaged with Contact Blade Here, conductor 40 is electrical with the vacuum interrupter 50 connected by means of a fixed conductor connection 92 and a flexible conductor 94, which is connected to a movable contact rod 96 of the vacuum interrupter 50. The movable one Contact rod 96 is actuated by a rotatable shaft 97 of actuating mechanism 54. When the moving Contact blade 88 is moved to the open position by actuation mechanism 54, the contact blade 88 separated from the connecting conductor 40. When the contact blade 88 is in the ground position, it stands it engages ground terminal 42.

The operating mechanism 54 for the load switches 36 and 38 as well as for the circuit breaker 48 is with the Vacuum switch 50 connected via an actuating coupling 98, the coupling 98 being connected between the actuating shafts 91 and 97, so that the movable Borrowed contact 96 of vacuum interrupter 50 with a stationary contact 100 of vacuum interrupter 50 in Contact is or is separated from it, depending on the mode of operation of switches 36, 38 and 48.

Figures 5 to 7 show the connecting coupling 98 between the actuating shafts 91 and 97 for coupling of the vacuum switch 50 and the circuit breaker 48 of Figures 3 and 4. As in connection with the figures 3 and 4, rotation of the actuating shaft 91 causes opening and closing movements of the movable ones Contact blade 90 of the circuit breaker 48 via the connecting links which connect the actuating shaft 91 to the blade 90. In a similar way Way causes a rotation of the actuating shaft 97 opening and closing movements of the movable contact rod 96 of the vacuum interrupter 50 by connecting links between the actuating shaft 97 and the movable contact rod 96. This actuation

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shafts 91 and 97 are connected to one another by connecting members 98, the latter having a lever 102 which is connected to the operating shaft 91 is a connecting link 104, one end of which is pivotably connected to the tip of the operating lever 102 by means of a pin 106 is, a connecting link 108, which with its one end by means of a pin 110 at the center of the connecting link 104 is connected and a lever 112 which is pivotable by means of a pin 114 with his one end is connected to the other end of the link 108 and that at its other end is connected to the main shaft 97, has. The actuators 98 also have a lock 116 pivotally supported on a stationary pin 120 is, further a trigger lever 122 which is pivotally mounted on a stationary pin 124 and a spring lever 126. The latch 116 is counterclockwise biased around the pin 120 of FIG. 5 by a torsion spring 128. One end of the Torsion spring 128 is in engagement with the lock 116, while its other end with the spring lever 126 is connected via a pin 130 at one end of the lever 126. The other end of the spring lever 126 is pivotally connected to the pin 110 which connects the actuator 104 to the coupling 108. The trigger lever 122 is also biased clockwise by a torsion spring 132. The spring 132 is wound around the pin 124 and stands at one end with a stationary pin 134 and with its other end in connection with a pin 136, which is attached to the trigger lever 122. The actuating clutch 98 also has a tension spring 138, which closes the circuit breaker 48. This spring lies between a stationary pin 140 which is attached to a Housing part of the switching device is attached and a pin 142 which is attached to one end of the actuator 104 is attached and that there farthest from the end to which the pin 106 is attached.

■■ ■■ ■ ^S421265 In the position shown, the pin 142 is in engagement with the connecting coupling 108 and prevents further clockwise rotation of the actuating member 104 relative to the member 108. The pin 106, which connects the actuating lever 102 and the actuating coupling 104, has a roller 144 attached thereto which is in rolling contact with a cam surface 146 of the latch 116. The lock 116 also has first and second locking surfaces 148 and 150, respectively, which engage the trigger member 122. The first locking surface 148 is in engagement with the trigger part 122 in the position shown in FIG. 5. The second locking surface 150 is in engagement with the trigger part 122 in the position shown in FIG the position shown in Fig. 6, the second locking surface 150 of the locking part 116 is in contact.

If, in the position of FIG. 5, the actuating mechanism 54 causes the actuating shaft 97 to be in the Turns clockwise to close the vacuum switch 50 via the coupling according to FIG. 3, the transmits to Lever 112 attached to the shaft 97 transfers the torque the connecting member 108, the operating member 104 and the operating lever 102 to the operating shaft 91 to turn the latter clockwise. The clockwise rotation of the operating shaft 91 is controlled by the Coupling 60 transferred to the movable contact blade 88 of the circuit breaker 48 (Fig. 3), whereby the Blade 88 is brought into the closed position shown in FIG. 3. It should be noted that the length ratios between levers 112, 102 and the organs 104, 108 and the angular relationships of the levers 102 and 112 with respect to the shafts 91 and, respectively 97 are precisely set so that the movable contact blade 88 the contact element on the connecting

touches a conductor to close the circuit breaker 48, before the vacuum switch 50 is closed.

After closing the vacuum switch 50 and the circuit breaker 48, the actuator 104 is in an upper Moved position at which spring energy is stored in the torsion spring 128. After full Rotation of the operating lever 102 in the clockwise direction is the locking part 160 around the pin 120 in the Rotated clockwise so that the roller 144 on the pin 106 engages the cam surface 146 of the locking member 116 can touch and consequently the engaging end 152 of the Trigger part 122 the second locking surface 150 contacts, as shown in Fig. 6, whereby the locking member 116 and the operating lever 102 of the illustrated Position are held in which the circuit breaker 48 and the vacuum switch 50 in their Are closed.

When the vacuum interrupter 50 by a trip mechanism housed in the operating mechanism 54 is triggered, the main operating shaft 97 rotates from that shown in FIG Counterclockwise position in the position shown in FIG. 7, which is similar to that of FIG. These Counterclockwise rotation of shaft 97 also causes actuator 104 to rotate about the pin counterclockwise, this pin, together with the one held in the same position as in FIG Shaft 91 is held stationary in this mode of operation. This rotation of the actuator 104 in the opposite A clockwise direction causes the tension spring 138 to be stretched Just before the actuator 104 completes its rotation, it abuts the trigger pin 136 on the Trigger part 122 on, so that it is rotated about the pin 124 counterclockwise and that against the im Clockwise acting force of the spring 132. Then the connection or the engagement between

the second locking surface 150 of the locking part 116 and the engaging end 152 of the trigger part 122 released so that the locking member 116 under the biasing force of the spring 128 is released. Since the spring 128 at this time due to the lower Position of the pin 130, which is attached to the spring lever 126, is stretched and due to the counterclockwise direction rotated actuator 104, the locking part 116 rotates counterclockwise around the pin 120, the roller 144 on the actuating lever 102 along the cam surface 146 of the locking part 116 rolls. When the roller 144 moves from the cam surface 146 of the locking part 116 or respectively lifts from there, the actuating member 104 is rotated clockwise on the basis of the in the spring 138 stored force, with which the actuating shaft 91 is rotated counterclockwise and thus the circuit breaker 48 opens. It should be noted that the dimensions of the individual components of the operating mechanism described above is chosen so that the time between the opening of the Vacuum switch 50 and the opening of the circuit breaker 48 is not less than one cycle.

With the arrangement described above, the circuit breaker is via a special coupling with a vacuum interrupter coupled so that the operating intervals of the circuit breaker and the vacuum interrupter are stable are. This ensures a current and voltage interruption. Also the one for assembly the switch reduces the space required.

All technical details presented in the patent claims, the description and the drawing can be essential to the invention both individually and in any combination with one another.

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Claims (6)

Claims f 1. / Switching device for an electrical power distribution network with two load switches (36, 38) for connecting or disconnecting the power distribution network, with a power supply switch (46), which is connected between the two load switches (36, 38), for the supply of electr - shear energy to these and with an actuating mechanism (54) for actuating the switches (36, 38, 46), characterized in that the mains supply switch (46) contains a vacuum switch (50). 2. Switching device according to claim 1, characterized in that there is also a hermetically sealed housing (26) is provided, which accommodates the load switches (36, 38) and the vacuum switch (50), the housing (26) is filled with electrically insulating gas (28). 3. Switching device according to claim 1 or 2, characterized in that the power supply switch (46) additionally a circuit breaker (48) which is connected in series with the vacuum switch (50). 4. Switching device according to one or more of the claims 1 to 3, characterized in that the load switches (36, 38) and the disconnector (48) are connected to earth (42, 44, 52) can be connected. 5. Switching device according to claim 1, characterized in that the actuating mechanism (54) has a coupling (98) which is connected between the circuit breakers (36, 38) and the disconnector (48). 6. Switching device according to claim 5, characterized in that the coupling (98) has a mechanism (91, 97, 102, 104, 108, 112) which is arranged so that it only opens the circuit breaker (48) when the Vacuum switch (50) is open.