CN103325557B - A kind of GIS voltage transformer - Google Patents

Abstract

The present invention designs a voltage transformer for GIS, which includes a tank body and a device body. A basin-type insulator is fixedly installed on the flange of the tank body. The voltage transformer is connected to the GIS equipment through the basin inlay on the basin-type insulator. A breaking device is installed between the basin inlay and the device body, and an insulating transmission rod is connected to the breaking device. By operating the insulating driving rod, the opening and closing of the breaking device can be realized, thereby realizing GIS equipment and voltage Disconnection or connection of transformers. Whether the disconnection of the breaking device of the present invention is realized through the operation of the insulating transmission rod connected to it, the breaking device is connected with the GIS equipment through the basin inlay, so that when the driving breaking device is disconnected when the insulating driving rod is operated, the The voltage transformer is disconnected from the GIS equipment, otherwise the voltage transformer is connected to the GIS equipment. The invention arranges the breaking device inside the voltage transformer, which avoids dismantling or installing the voltage transformer from the GIS equipment during the delivery test and the withstand voltage test after the on-site installation.

Description

A kind of voltage transformer for GIS

【Technical field】

The invention relates to the field of voltage transformer manufacturing, in particular to a voltage transformer for GIS.

【Background technique】

Gas-insulated metal-enclosed switchgear (GIS) has the advantages of small footprint, all components are completely enclosed in a metal shell, little external environment interference, high reliability, easy installation in maintenance, and low operating costs. It has been widely used in industry.

At present, GIS equipment needs to carry out the power frequency withstand voltage test after the factory test and field installation. In order to avoid the primary and secondary windings of the voltage transformer from being burned due to the power frequency The transformer is disconnected from the GIS equipment, and then connected to the GIS equipment after the test.

At present, there are two schemes for disconnecting the voltage transformer. One is to directly remove the voltage transformer from the GIS equipment, and the other is to add an independent isolation switch element outside the voltage transformer. By operating the isolation switch, the voltage transformer is removed from the GIS. The device is disconnected. The first scheme needs to remove the voltage transformer before the test, and then install the voltage transformer on the GIS equipment after the test, which not only increases the workload in the installation process of the GIS equipment, but also reduces the reliability of the installation. The device poses a security risk. The isolation switch element added in the second scheme is only used when the GIS equipment is subjected to the withstand voltage test, which increases the manufacturing cost of the GIS equipment invisibly, and neither meets the development requirements of energy saving or consumption reduction, nor does it meet the development of GIS equipment miniaturization trend.

In the present invention, the breaking device is built-in and compounded inside the voltage transformer body. Compared with the external independent isolation switch element in the second scheme, the manufacturing cost of the present invention is lower, and the volume of the GIS interval can be reduced, the length of the GIS interval can be shortened, and more greenhouse gas use.

【Content of invention】

The invention provides a voltage transformer for GIS. A breaking device is arranged inside the voltage transformer, and the disconnection or connection between the voltage transformer and GIS equipment is realized by driving the breaking device.

In order to solve the above problems, the present invention adopts the following technical solutions:

A voltage transformer for GIS, including a tank body and a device body, the tank body flange is fixedly installed with a pot insulator, the voltage transformer is connected to the GIS equipment through the pot inlay on the pot insulator, and the pot A breaking device is installed between the inlay and the device body, and an insulating transmission rod is connected to the breaking device. By operating the insulating driving rod, the closing and opening of the breaking device is realized, thereby realizing the disconnection between the GIS equipment and the voltage transformer. on or connected.

As a preferred embodiment of the present invention, the pot inlay is fixedly installed in the tank through a pot insulator.

As a preferred embodiment of the present invention, the insulating transmission rod is perpendicular to the moving direction of the breaking device and the insulating transmission rod protrudes outside the tank body.

As a preferred embodiment of the present invention, the tank body is provided with a mounting hole through which the insulating transmission rod passes, and the mounting hole is sealed by a shaft sealing device.

As a preferred embodiment of the present invention, the breaking device includes a static-side conductor, a moving-side conductor, and an isolation knife connected between the static-side conductor and the moving-side conductor. When the insulating transmission rod is rotated, the insulating transmission rod drives the isolation The knife realizes the disconnection or connection of the moving side conductor and the static side conductor.

As a preferred embodiment of the present invention, both the static-side conductor and the moving-side conductor have a U-shaped structure, and the isolation knife is installed inside the U-shaped groove of the moving-side conductor.

As a preferred embodiment of the present invention, the isolating knife is electrically connected to the conductor on the moving side and the conductor on the static side through conductive strap contacts.

As a preferred embodiment of the present invention, the insulating transmission rod is connected to the isolation knife through a spline.

As a preferred embodiment of the present invention, the part of the insulating transmission rod protruding from the outside of the voltage transformer is equipped with a manual crank arm or an electric mechanism to operate the insulating transmission rod to realize disconnection or communication between the voltage transformer and the GIS equipment.

As a preferred embodiment of the present invention, the shaft sealing device includes a cover plate, and the cover plate is connected and sealed with the tank body of the voltage transformer through a bearing and a sealing ring.

Compared with the prior art, the present invention has the following advantages: the present invention sets a breaking device in the tank body of the voltage transformer, whether the disconnection of the breaking device is realized through the operation of the insulating transmission rod connected thereto, the breaking device It is connected with the GIS equipment through the basin inlay, so that when the driving breaking device is disconnected when the insulating transmission rod is operated, the voltage transformer is disconnected from the GIS equipment, otherwise the voltage transformer is connected with the GIS equipment. The invention arranges the breaking device inside the voltage transformer, which avoids dismantling or installing the voltage transformer from the GIS equipment during the delivery test and the withstand voltage test after the on-site installation.

【Description of drawings】

Figure 1 is a schematic diagram of the structure of the original voltage transformer;

Fig. 2 is the structural representation of voltage transformer of the present invention;

Figure 3 is a schematic diagram of the closing position of the disconnecting device;

Figure 4 is a schematic diagram of the opening position of the disconnecting device.

in:

1 pot insulator 2 Potential transformer tank 3 Conductive rod 4 Body 5 static side conductor 6 Isolation knife 7 Moving side conductor 8 Insulated drive rod 9 Shaft seal 10 strap finger 11 basin inlay

【detailed description】

A voltage transformer for GIS with the function of opening and closing, comprising a pot insulator 1, a body 4 of the voltage transformer and a breaking device, the breaking device and the body of the voltage transformer are placed in the tank of the voltage transformer Inside the body 2, the breaking device is placed between the body 4 of the voltage transformer and the pot insulator 1. The breaking device includes: a U-shaped moving-side conductor 7, a U-shaped static-side conductor 5, and an isolating knife 6. The moving side conductor 7 is connected to the body of the voltage transformer, the static side conductor 5 is connected to the GIS equipment through the basin inlay 11, the moving side conductor 7 is connected with an insulating transmission rod 8, and by operating the insulating transmission rod 8, Control the isolation knife 6 to realize closing and opening operations of the voltage transformer.

The moving side conductor 7 and the isolation knife 6 realize reliable electrical contact through the conductive strap contact fingers. The isolation knife 6 and the insulating transmission rod 8 adopt spline cooperation. When the insulation transmission rod rotates, the isolation knife 6 is driven to rotate together. When the insulating transmission rod rotates counterclockwise, it drives the isolation knife 6 to insert the static side conductor 5, and the static side conductor 5 and the isolation knife 6 realize reliable electrical contact through the conductive watch strap contact fingers, so that the basin-type inlay 11 and the voltage transformer The body of the device is electrically connected, and the voltage transformer is in the closed state; when the insulating transmission rod rotates clockwise, it drives the isolation knife 6 away from the conductor 5 on the static side, and the conductor 5 on the static side is disconnected from the isolation knife 6, so that the pot inlay The body of the voltage transformer is electrically disconnected, and the voltage transformer is in an open state.

The insulating transmission rod 8 is led out of the tank body of the voltage transformer through the shaft seal device 9, and the insulating transmission rod exposed to the tank body of the voltage transformer can be installed with a manual crank arm to realize the manual operation of the voltage transformer opening and closing; or, The electric mechanism can also be installed to realize the intelligent control operation of the voltage transformer.

The present invention will be described in further detail below in conjunction with the accompanying drawings.

By improving the internal structure of the voltage transformer, the invention combines the breaking device inside the tank body of the voltage transformer, and develops a voltage transformer with closing and opening functions.

Referring to Fig. 1, the original structure of the voltage transformer is that a pot insulator 1 is installed on the top of the pot body 2 of the voltage transformer, the body 4 of the voltage transformer is connected with the GIS equipment through the pot insulator 1, and the body of the voltage transformer 4 is connected with the pot insulator 1 through the conductive rod 3.

Referring to Fig. 2, the present invention replaces the original conductive rod 3 with a breaking device, the U-shaped static side conductor 5 of the breaking device is connected to the basin inlay 11, and the U-shaped static side conductor 5 is equipped with a conductive surface With contact finger 10; the moving side conductor 7 of the breaking device is connected to the body 4 of the voltage transformer, and the isolation knife 6 is installed in the U-shaped groove of the moving side conductor 7, and is connected to the moving side through the conductive strap contact finger 10. The conductor 7 realizes reliable electrical contact, the moving side conductor 7 is provided with a transmission hole, the isolation knife 6 is provided with a spline hole, the insulating transmission rod 8 passes through the moving side conductor 7 and the isolation knife 6, and the insulating transmission rod 8 and the moving side conductor 7 Through the cooperation of the transmission hole, the insulating transmission rod 8 is provided with the functions of positioning and rotation. The insulating transmission rod 8 and the isolation knife 6 are matched through the spline hole, so that the insulation transmission rod 8 and the isolation knife 6 can rotate together. The other end of the insulating transmission rod 8 leads out of the tank body 2 of the voltage transformer through the shaft sealing device 9. The shaft sealing device 9 is composed of a cover plate, a sealing ring and a bearing, and its function is to seal the SF6 gas chamber inside the voltage transformer.

Referring to Fig. 3 and Fig. 4, the purpose of the breaking device is to drive the isolation knife 6 to connect or disconnect with the static side conductor 5 by controlling the rotation of the insulating transmission rod 8, so as to realize its opening and closing functions. When the insulating transmission rod rotates counterclockwise, it drives the isolation knife 6 to insert the static side conductor 5 until the isolation knife 6 touches the closing stop point, the rotation of the insulation transmission rod 8 ends, and the static side conductor 5 passes through the conductive strap contact finger 10 It is in electrical contact with the isolation knife 6, so as to realize the connection of the internal structure of the voltage transformer; when the insulating transmission rod rotates clockwise, it drives the isolation knife 6 away from the conductor 5 on the static side, until the isolation knife 6 touches the opening stop point, and the insulation transmission After the rotation of the rod 8 is completed, the static-side conductor 5 is separated from the isolation knife 6, thereby realizing the disconnection of the internal structure of the voltage transformer.

Claims (8)

1. a GIS voltage transformer, it is characterized in that: described voltage transformer comprises tank body (2) and device body (4), described tank body (2) flange port is installed with disc insulator (1), voltage transformer is connected with GIS device by the basin inlay (11) on disc insulator (1), between described basin inlay (11) and device body (4), breaking device is installed, described breaking device comprises quiet side conductor (5), dynamic side conductor (7), and the isolation knife (6) be connected between quiet side conductor and dynamic side conductor, dynamic side conductor (7) offers driving hole, (6) offer splined hole to isolation knife, described breaking device is connected with insulating driving rod (8), insulating driving rod (8) is to being through at dynamic side conductor (7) and isolation knife (6), insulating driving rod (8) and described isolation knife (6) pass through spline joint, insulating driving rod (8) is coordinated by driving hole with dynamic side conductor (7), for insulating driving rod (8) provides location and the effect rotated, drive isolation knife (6) to rotate to realize the disconnection of dynamic side conductor (7) and quiet side conductor (5) by actuating insulating driving rod (8) or be communicated with, realize the conjunction of breaking device and divide, and then realize the disconnection of GIS device and voltage transformer or be communicated with.

2. a kind of GIS voltage transformer as claimed in claim 1, is characterized in that: described basin inlay (11) is fixedly mounted in tank body by disc insulator (1).

3. a kind of GIS voltage transformer as claimed in claim 1, is characterized in that: described insulating driving rod is vertical with the direction of motion of breaking device and described insulating driving rod stretches out tank body outside.

4. a kind of GIS voltage transformer as claimed in claim 3, is characterized in that: described tank body is provided with the installing hole run through for insulating driving rod, and described installing hole is sealed by gland seal device.

5. a kind of GIS voltage transformer as claimed in claim 4, is characterized in that: described quiet side conductor and dynamic side conductor are U-shaped structure, and it is inner that described isolation knife is arranged on dynamic side conductor U-lag.

6. a kind of GIS voltage transformer as claimed in claim 5, is characterized in that: described isolation knife and dynamic side conductor and quiet side conductor are electrically connected by the watchband-shaped contactor conducted electricity.

7. the GIS voltage transformer as described in claim 3 or 4, is characterized in that: the part that described insulating driving rod stretches out voltage transformer outside is provided with manual connecting lever or motor drive mechanism and realizes the disconnection of voltage transformer and GIS device with actuating insulating driving rod or be communicated with.

8. GIS voltage transformer as claimed in claim 4, is characterized in that: described gland seal device comprises cover plate, and described cover plate to be connected with the tank body of voltage transformer by bearing and sealing ring and to seal.