JPH03119623A - Switching device for transferring circuit - Google Patents

Abstract

PURPOSE:To surely transfer a circuit with a simple structure and remarkably reduce an installation space by arranging two vacuum valves, and connecting moving contacts of vacuum valves to a crank interlocked with one switching shaft respectively so that one vacuum valve is closed when the other vacuum valve is opened. CONSTITUTION:When a circuit transfer command is given to an operating unit mounted on a bogie 8 and the operating unit is operated to rotate a switching shaft 10, a crank 11 is rotated counterclockwise via an insulating rod 16, the moving contact 4 of a vacuum valve 2 is driven downward via a pin 21 to open the valve 2, and the moving contact 5 of a vacuum valve 3 is driven downward via a contact spring 14 to close the valve 3. The power feed to the load side is transferred from an A side power source to a B side power source.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a circuit switching switchgear for switching between two power sources, such as a main power source and an emergency power source, to supply power to a load.

[Conventional technology]

2 shows a conventional configuration example of a circuit switching switchgear for supplying power to a load by switching between two power sources 1, for example, a main power source and an emergency power source. In FIG. This is a switch that switches the load current supplied to the low-voltage bus S via the step-down transformer T, and the symbol B is the main power supply M.
This is a switch that closes the circuit and supplies load current from the private generator E, which is an emergency power source, to the bus S when the power supply from the generator stops. Switches A and B at this time
The operations of the two are electrically or mechanically interlocked to ensure that the two are in different open and closed states. That is, in the electrical interlock, for example, when the power supply from the main power supply M stops and the voltage of the low voltage side bus S decreases, the undervoltage relay operates and the switch A performs a cutoff operation, the switch A A closing contact (b contact) in the auxiliary contact is closed, and a closing command is given to switch B via this b contact, causing switch B to perform a closing operation. When the main power supply M system is restored and the low-voltage side voltage of the step-down transformer T is restored, the first thing to do is to manually shut off the switch B based on this recovery display, and the closing contact (b A closing command is given to switch A via the contact point. Furthermore, in the mechanical interlock, the movable members in the respective opening/closing mechanisms are mechanically coupled so that the switches A and B can only operate in directions that result in mutually different opening/closing states.

[Problem to be solved by the invention]

In this way, conventional circuit switching is performed by electrically or mechanically interlocking two switches, each equipped with its own opening/closing drive device, or operating device, which results in a complex structure and requires less space for installation. There was a drawback that two units were required.

An object of the present invention is to provide a structure of a circuit switching switchgear that can reliably switch between two power sources without complicating the structure, and that requires a significantly smaller installation space than the conventional one. be.

[Means to solve the problem]

In order to solve the above problems, in the present invention, the circuit switching switching device is configured using a vacuum valve in which the current switching part is short in the moving direction of the movable contact and the opening/closing stroke of the movable contact is also short. Two of these vacuum valves,
The movable contacts are arranged to face each other in the axial direction on the same axis, and are linked to one opening/closing shaft so that when one vacuum valve is open (closed), the other vacuum valve is closed (open). The structure is such that the movable contacts of the vacuum valves are respectively connected to the cranks.

[Effect]

If the circuit switching switch device has such a structure, the movable contacts are connected to the same switching shaft via the crank, so when one vacuum valve is open (closed), the other vacuum valve is always in the closed (open) state. This eliminates the need for conventional electrical or mechanical interlocks, and greatly simplifies the structure for keeping both vacuum valves in different open and closed states at all times. In addition, since both vacuum valves are arranged in a row on the same axis, by making the axis vertical, there are usually fewer restrictions on installation space in the height direction, and the axial length is short. Since the vacuum valve is used, it is possible to install a circuit switching switchgear without substantially increasing the installation space beyond the space required for one switch.

〔Example〕

FIG. 1 shows an embodiment of the circuit switching switchgear structure according to the present invention. FIG. 0 shows a side view of the device, in which vacuum valves for each phase are arranged in parallel at intervals in a direction perpendicular to the plane of the paper.

A column-shaped insulator 9.9 is fixed horizontally at the upper and lower positions of the bogie frame 8 on the bogie frame 8 on which one operating device for opening and closing one vacuum valve (3 phases) is mounted. The vacuum valve L They are supported so as to face each other in the axial direction on the same axis. Further, a columnar insulator 19 is fixed to the bogie frame 8, and a crank 11 is provided at the top of the columnar insulator 19 so as to be freely rotatable around an axis of 2 degrees. A lever 1 integrated into an opening/closing shaft 10 that is rotationally driven by a device.
2 through an insulating iron 16. Two elongated holes 11a and llb are formed in the crank 11, and a pin 21 is inserted into these elongated holes and an axial elongated hole 4a4a formed in each extended shaft of the movable contacts 4 and 5 of the vacuum valve. By inserting the movable contact 4,
5 and the crank 11 are connected via vias 21 and 22. Figure 0 shows a state where the vacuum valve 2 is closed and the vacuum pulp valve is open, and the load current supplied from the A side power supply is It flows into the mother m1s (FIG. 2) via the member 17, the fixed contact 6, the movable contact 4, the flexible conductor 23, and the terminal 25. In this state, the movable contact 4 of the vacuum valve 2
The contact spring 13 that applies contact pressure to the crank 11
, while the contact spring 14 of the vacuum pulp shell is extended to its natural length. Now, a circuit switching command is given to the operating device mounted on the trolley 8, and when the operating device operates and the opening/closing shaft 10 rotates in the direction of the arrow, the crank 1
1 is rotated counterclockwise via an insulating rod 16, and drives the movable contact 4 of the vacuum valve 2 downward via a pin 21 to open the vacuum valve 2, and also via the contact spring 14. The movable contact 5 of the vacuum valve l is driven downward to close the vacuum valve l, thereby switching the power supply to the load side from the A side power supply to the B side power supply, and the load current is transferred from the B side power supply to the support member. 18-Fixed contact 7
- Movable contactor 5 - Flexible conductor 24 - Flows into bus bar S (FIG. 2) via one terminal 25.

〔Effect of the invention〕

As described above, in the present invention, the circuit switching switching device is configured using a vacuum valve in its current switching section, and two of the vacuum valves are arranged so that the movable contacts are aligned on the same axis. They are arranged so that they face each other, and when one vacuum valve is open (closed), the other vacuum valve is closed (closed).
Since the movable contacts of the vacuum valves are each connected to a crank that interlocks with one opening/closing shaft so that the vacuum valve is in the open (open) state, when one vacuum valve is in the open (closed) state,
The other vacuum valve is always closed (open). For this reason, as in the past, two switches are used, each with its own operating device, and the device configuration is electrically or mechanically interlocked so that the open and closed states of both switches are always different. This eliminates the need for circuits to be switched over reliably with a simple structure. In addition, vacuum valves with a short axial length are used in the current switching part of the switchgear, and they are arranged in one row on the same axis in the vertical direction, so the installation space for the switchgear is small. The cost is lower than that of a conventional opening/closing device because it can be installed without requiring a substantial increase in the number of units required, and since only one operator is required to open and close the 2&U vacuum valve.

[Brief explanation of drawings]

FIG. 1 is a side cross-sectional view showing one embodiment of a circuit switching switchgear structure according to the present invention, and FIG. 2 is a circuit diagram for explaining the structure of a conventional circuit switching switchgear. 1: Switching device for circuit switching, g, l: Vacuum valve, 4.
5: Movable contact, 4a, 5a: Long hole, 6.7: Fixed contact, lO: Opening/closing shaft, 11: Crank, lla, 11bF
Long hole, 12 levers, 16: wAit OF, 2
0: Axis, 21゜22=pin, M: Main power supply, E: Private power generation [1 (Emergency Figure 1, Figure 21! 8)

Claims (1)

[Claims] 1) Two vacuum valves each having a bar-shaped movable contact that advances and retreats in the axial direction to approach and separate from a fixed contact are arranged so that the movable contacts face each other in the axial direction on the same axis, and one vacuum When one valve is open (closed), the other vacuum valve is closed (open)
A switching device for circuit switching, characterized in that the movable contacts of the vacuum valve are each connected to a crank that interlocks with one opening/closing shaft so that the vacuum valve is in the following state.