JPH03215105A - Gas insulation switchgear - Google Patents

Abstract

PURPOSE:To transmit rotation to a central gear in a gear box through a single operating rod so as to simultaneously open/close a three-phase disconnecting part by oil-tightly providing the gear box, in which a gear unit is housed, in a closed tank. CONSTITUTION:When an operating rod 35, provided in an operating device 12, is rotation-operated, a gear 14a constituting a gear unit U in a gear box 37 is rotated in accordance with rotation of the rod 35, and the rotation of the gear 14a is transmitted to adjacent gears 14b, 14c through a transmitting gear 15. As a result, insulating rods 31a, 31b, 31c, connected to three-phase disconnecting parts 4a, 4b, 4c and oil-sealed by the gear box 37 and seal members 37a, 37b, 37c, are simultaneously rotated. Open/close action of the disconnecting parts 4a, 4b, 4c is performed by moving movable contact pieces 5a, 5b, 5c, of which the disconnecting part is formed, in the longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention] (Industrial Application Field) The present invention relates to a gas-insulated switchgear that simultaneously opens and closes three phases using a pinion and a rack. (Prior art) In recent years, in order to reduce the size of substations and improve aesthetics, gas-insulated three-phase integrated power disconnecting devices such as new line switches and earthing switches are often used, and their capacity is increasing. The capacity is also increasing as the demand for electricity increases. The three-phase gas-insulated switchgear is configured so that the three-phase disconnection sections are placed inside a sealed tank filled with gas, and each phase disconnection section is opened and closed by an operating device installed outside the sealed tank. It has been done. In addition, the opening/closing operation mechanism for the disconnection section is provided with a rack on the movable contact, and by driving a pinion that meshes with the rack with an insulating rod that is rotated by the operating device, the pinion-rack mechanism allows the movable contact to open/close. Some are configured to do this. Therefore, in the conventional three-phase all-in-one gas insulated new circuit system of this type, the mechanism for transmitting the opening/closing force from the operating device outside the sealed tank to each of the three-phase disconnection sections inside the sealed tank is A gear unit is configured in which an insulating rod having a pinion that engages with a rack at a disconnection section of a phase is extended outside the sealed tank, and gears are provided at the extended ends of the insulating rods of each phase so as to engage with each other, and the gear unit The insulating rod of one of the gears is connected to the operating shaft of the operating device. In other words, by transmitting the operating force of the operating device outside the sealed tank to one insulating rod and gear of the gear unit, the operating force is transmitted from the gear unit to the pinion of each phase via the gear and insulating rod of each phase. The rotation of this pinion drives the movable contacts of each phase disconnector via the rack. (Problem to be Solved by the Invention) However, in the gas-insulated switchgear configured as described above, especially in the operating force transmission mechanism from the operating device to the disconnection section of each phase, the three insulating rods of each phase are connected to the closed tank. Since the gas is guided to the gear unit by passing through the gas, a rotating gas seal is provided at each penetration part. This rotating gas seal material had the disadvantage that the frictional resistance of the rotating seal part was extremely high, and as a result, the loss of driving force was also extremely large, making it difficult to open and close smoothly. In addition, the insulating gas could leak to the outside due to wear of the gas seal at the penetration part of the insulating rod, and there was also a risk that the grease from the bearing part of the penetration part could adhere to the insulating rod, resulting in a decrease in insulation. An object of the present invention is to minimize the number of members that penetrate the sealed tank of the operating force transmission mechanism from the operating device to the disconnection section of each phase, to facilitate the gas seal configuration, and to improve the oil tightness of the gear unit and the shielding effect. An object of the present invention is to provide a gas insulated switchgear with improved performance.

[Structure of the invention]

(Means for Solving the Problems) The gas insulated switchgear of the present invention houses a three-phase switching section in a cylindrical tank filled with insulating gas, and a movable contactor of a disconnection section of each phase. In a gas-insulated switchgear that is driven via a pinion and a rack to open and close by rotating an insulating rod of an operating device installed outside the tank, each phase disconnection section of the three-phase disconnection section is connected inside the cylindrical tank. is placed at each vertex of an isosceles triangle whose base is parallel to the operating device side, and is engaged with the rack of the movable contact of each phase disconnecting section in the space on the operating device side of the three-phase 2 disconnecting section. A gear box is arranged to house the gears provided on the insulating rod of the pinion so that they interlock with each other, and one operating rod connected to one of the gears in this gear box is inserted through the gear box and the tank. The device is characterized in that it is connected to the operating device. (Function) In the present invention, by providing the gear box that houses the gear unit in an oil-tight manner in a sealed tank, the operating driving force of the operating device outside the tank is transmitted through one operating rod to the gear box inside the gear box. Since the signal is transmitted to the central gear, which in turn transmits the signal to the gears provided on the insulating rods of the other phases, the three-phase disconnection sections can be opened and closed simultaneously.

(Example) The present invention will be explained below with reference to the example shown in FIGS. 1 and 2. First, in FIG. 1, three-phase disconnection sections 4a, 4b, and 4c of the gas insulated switchgear of the present invention are located at each vertex of an isosceles triangle in a tank 2 sealed with an insulating gas 3 having a circular cross section, as shown in the figure. It is located in And an operating device I for each phase disconnection section 4a, 4b, 4c! 12 is arranged outside the tank 2 on the base side of an isosceles triangle having each phase disconnection section 4a, 4b, 4c at each vertex. In the present invention, each phase disconnection section 4a, 4b in the tank 2
, 4c is placed in a relatively wide space 30 on the base side of the isosceles triangle. 12 operating forces are applied to each phase disconnection section 4a.
, 4b, 4c is arranged.

That is, each phase disconnection section 4a, 4 is provided in the gear box 33.
Movable contacts 5a, 5b, 5 of b, 4c, respectively
The three gears 14a, 14b, 14c connected to the insulating rods 31a, 3lb, 31c on the c side are connected to the transmission gear 1.
5. 15, and the central gear 1
4b is further connected to an operating rod 35 extending into the tank 2 from the operating device l2.

Also, the insulating rods 31a and 3l of each phase of the gear box 33
Rotating shaft seal members 37a, 37b, 37c are provided in the portions b, 31c penetrate, respectively, and each gear 14a, 14b, 14c and transmission gear 15
．． Shield 3 surrounds gear unit U consisting of 15
8 is provided. More controls! A rotating gas seal member 36 is also provided on the closing plate 34 of the tank 2 through which the operating rod 35 of 112 passes.

In FIG. 2, the gear box 33 provided in the tank 2 according to the present invention is connected to each phase disconnection section 4a in the tank 2 by a support plate 32 hanging from the inner wall of the tank 2 as shown in the figure.
, 4b, and 4c in a space 30 that does not get in the way. Also, each gear 14 in this gear box 33
a, 14b, 14c to each phase disconnection section 4a, 4b,
4c, each insulating rod 31a, 3lb,
At the tip of 31c, there are binions lla and ll, respectively.
b, lie are provided, and each pinion ll
a, llbt llc are fixed electrodes 22a, 22b,
The racks 6a, 6b, 6c of the movable contacts 5a, 5b, 5c corresponding to the movable contacts 22c are provided to mesh with the racks 6a, 6b, 6c. Furthermore, movable contacts 5a, 5b, 5 of each phase
c are electrode members 40a, 40b, 40c supported on insulating spacers 24 that partition the tank 2 as shown in FIG.
It is supported in a sliding contact manner.

In the gas insulated switchgear of this embodiment having such a configuration, when the operating rod 35 provided in the operating device 1112 is rotated, the gear unit U in the gear box 37 is configured accordingly. The gear 14a rotates, and the rotation of the gear 14a is transmitted to the adjacent gears 14b and 14c via the transmission gear 15. As a result, the insulating rods 31a, 3lb, 31c connected to the three-phase disconnection parts 4a, 4b, 4c and sealed with oil by the gear box 37 and the seal members 37a, 37b, 37c rotate simultaneously, and each insulating rod The arranged pinion 11a
, 1lb, llc of each phase rack 6a,
6b and 6c are movable contacts 5 forming a disconnection section.
a, 5b, 5c in the longitudinal direction, disconnecting parts 4a,
Opening and closing operations of 4b and 4c are performed.

As described above, according to the gas insulated switchgear of the present invention, the operating rod 35 penetrates the closing plate 24 that partitions the inside and outside of the tank of the disconnector filled with insulating gas.
Since there is only one rotary gas seal 36, the frictional resistance generated at the seal is reduced to 1/3 of that of the conventional one.
Since the pressure is the same as in the tank 2 due to a, the sealing member 37a,
There is almost no frictional resistance at the seals 37b and 37c, and the driving force of the operating device 12 can be significantly reduced. Furthermore, since the frictional resistance of the gas seal part is reduced, the seal part is not worn out, and the insulating gas sealed inside the tank can be prevented from leaking to the outside due to wear of the seal part, which has been a problem in the past. Furthermore, gears and bearings to which lubricating oil is applied are housed in the gear box 37.
The operation prevents the lubricating oil from scattering into the tank 2, and
Insulating rod 3 due to the operation of disconnecting parts 4a, 4b, 4c
The lubricant in the bearings 37a, 37b, and 37c tends to drip onto the insulating rod 35 due to the rotation of the bearings 5, temperature rise during energization, temperature rise in direct sunlight, aging, etc., but the oil is sealed by the seal member 36. , it does not reach the insulating part of the insulating rod 35. In addition, the insulating rod 35 side of the gear box 37 has an appropriate curvature R, which relaxes the electric field of the insulating rod 35 and creates a stable electric field state.
The lubricant does not adhere to the insulating rod due to scattering of the lubricant or the influence of outside air due to energization of live parts and actual operation, and this does not lead to insulation deterioration. This allows it to fully perform its function as a gas insulated device. Furthermore, three-phase disconnection sections 4a, 4b, arranged in the tank,
4e are arranged in a triangular shape so that a space 30 is formed on the side where the operating device 12 is provided outside the tank 2, and a gear unit U for controlling the rotation of the insulating rods of each phase is housed inside the space 30. Since the gear box 33 is installed, the dead space inside the tank can be used effectively, and the height L of the entire device can be significantly reduced compared to the height of conventional models, reducing the size of the device and the installation space. It becomes possible to downsize the . In addition, since the rotary seal part formed on the closing plate is in one place, the structure is simplified, the equipment can be made smaller and the installation space can be reduced, and the assembly process is also simplified. [Effects of the Invention] As described above, according to the present invention, in a three-phase all-in-one type gas insulated switchgear, the three-phase disconnect section provided inside the tank is placed on the side where the operating device is provided outside the tank. They are arranged in a triangular shape to create a space, and in that space, a gear box that oil-tightly houses a gear unit that controls the rotation of the insulating rods of each phase is installed, and the driving force of the operating device is transferred to each insulating rod. By configuring the gear unit to transmit lubricating oil without splashing or dripping, the gas-insulated switchgear can open and close smoothly, greatly improving reliability, and making use of dead space in the tank. By doing so, it is possible to downsize the equipment and reduce the installation space, and furthermore, it is possible to provide a gas insulated switchgear with a simplified structure.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the gas insulated switchgear of the present invention, and FIG. 2 is an enlarged side view showing the disconnection section of FIG. 1. 1... Disconnector, 2... Tank, 3...
Insulating gas, 4... Disconnection section, 5... Movable contact, 6... Rack, 7... Insulating joint, 1
0... Insulating rod, 11... Pinion, 12
... Operating device, l3... Operating rod, 14...
・Gear, 15... Transmission gear, l6... Closure plate, 18... Rotating seal member, 22... Fixed side electrode,
24... Insulating spacer, 30... Space, 31...
- Insulating rod, 32... Support plate, 33... Gear box, 34... Closure plate, 35... Operating rod, 36... Rotating gas seal member, 37... Rotating oil seal member.

Claims (1)

[Claims] The three-phase switching section is housed in a cylindrical tank filled with insulating gas, and the movable contact of the disconnection section of each phase is connected via the pinion and rack by the rotation of the insulating rod of the operating device installed outside the tank. In the gas-insulated switchgear, which is driven by a gas-insulated switchgear to perform opening/closing operations, each phase disconnection section of the three-phase disconnection section is located within the cylindrical tank, and each vertex of an isosceles triangle whose base is parallel to the operating device side. A gear box is placed in a space on the operating device side of the three-phase disconnection section and houses the gears provided on the insulating rods of the pinions that mesh with the movable contact racks of each phase disconnection section so that they interlock with each other. A gas insulated switchgear characterized in that one operating rod connected to any one gear in the gear box is connected to the operating device through the gear box and the tank.