CN220272363U

CN220272363U - Two-station isolation grounding device for GIS

Info

Publication number: CN220272363U
Application number: CN202321951465.6U
Authority: CN
Inventors: 李元侠; 王振; 史利龙
Original assignee: Jiangsu Siyuan High Voltage Switch Co ltd; Shanghai Sieyuan High Voltage Switchgear Co ltd
Current assignee: Jiangsu Siyuan High Voltage Switch Co ltd; Shanghai Sieyuan High Voltage Switchgear Co ltd
Priority date: 2023-07-24
Filing date: 2023-07-24
Publication date: 2023-12-29
Anticipated expiration: 2033-07-24

Abstract

The utility model belongs to the technical field of high-voltage power transmission and distribution switch device parts, and discloses a two-station isolation grounding device for a GIS, which comprises an insulating shaft, a knife-type contact, a first sliding contact, a second sliding contact and a third sliding contact, wherein the first sliding contact, the second sliding contact and the third sliding contact are respectively and fixedly arranged on a front contact seat, a ground contact seat and a isolating switch contact seat; the front end of the insulating shaft is connected with the rotation driving mechanism; the knife-type contact connecting part is sleeved and fixed on the insulating shaft, the double-sided annular groove at the rear end of the connecting part is connected with the contact finger at the front end of the first sliding contact in a sliding and electric contact mode without separation, and the front end of the knife-type contact connecting part is matched with the second sliding contact and the third sliding contact. The device realizes that the TV or LA isolation and grounding functions can be realized by only rotating the operation shaft to a specified position, and the device can be operated without an air chamber, so that the maintenance working intensity can be reduced, the maintenance time can be shortened, and the device is simple to operate and reliable in performance.

Description

Two-station isolation grounding device for GIS

Technical Field

The utility model belongs to the technical field of high-voltage power transmission and distribution switch device parts, and particularly relates to a two-station isolation grounding device for a GIS.

Background

GIS (GAS INSULATED METALENCLOSED SWITCHGEAR), namely a gas-insulated metal-enclosed switchgear, is a metal-enclosed combined type complete high-voltage distribution device which uses SF gas as an insulation and arc extinguishing medium and uses a high-quality epoxy resin insulator as an insulation and support. The GIS connects electrical components such as a BUS (BUS), a Circuit Breaker (CB), a Disconnecting Switch (DS), a current Transformer (TA), a voltage Transformer (TV), a grounding switch, a maintenance grounding switch (ES), a fault quick-closing grounding switch (FES), a zinc oxide arrester (LA), a terminal component (SF sleeve or cable terminal) and other electrical equipment in a manner of an electrical main wiring determined by a user, and the electrical equipment is sealed by a metal armor to form a complete set of assembly, and is sealed in SF filled with the air pressure. The air chamber of the insulating gas forms a fully-closed combined power distribution device, the metal shell of the fully-closed combined power distribution device is directly grounded, and an on-site control cabinet (LCP) is arranged nearby.

In GIS field test or overhaul detection, the TV and LA are required to be electrically isolated from other components of GIS products, and the current isolation method is to use a voltage-resistant isolation device or a detachable conductor. When the isolating switch is adopted, the equipment occupies large space, has high cost and is complicated in operation and maintenance; when the detachable conductor is adopted, the maintenance period is long, the cost is high, the operation and maintenance are complicated, the gas chamber is required to be detached, and hidden danger is introduced for the safe operation of equipment. Therefore, the grounding isolation device which is convenient for isolating a TV (voltage transformer) or an LA (lightning arrester) during GIS overhaul and has simple operation and reliable isolation performance has great significance for reducing overhaul working intensity, shortening overhaul time, improving overhaul working environment and reducing overhaul cost.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides the two-station isolation grounding device for the GIS, which realizes the functions of isolating and grounding the TV (voltage transformer) or the LA (lightning arrester) by only rotating the operation shaft (insulating shaft) to a specified position, and the operation shaft is outside the GIS air chamber and can be operated without opening the air chamber, thereby not only reducing the maintenance working intensity, shortening the maintenance time, improving the maintenance working environment and reducing the maintenance cost, but also being simple to operate and reliable in performance.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the two-station isolation grounding device for the GIS is characterized by comprising an insulating shaft, a knife-type contact, a first sliding contact, a second sliding contact and a third sliding contact; the front end of the insulating shaft is connected with the rotation driving mechanism; the knife-type contact comprises an annular connecting part and a sheet-shaped contact finger at the front end of the connecting part, the center of the connecting part is sleeved and fixed on the insulating shaft, and the rear end of the connecting part is provided with a double-sided annular groove; the rear end of the first sliding contact is fixed on the front contact seat, and the front contact finger of the first sliding contact is connected with the double-sided annular groove in a sliding and electric contact way without separation; the positive contact seat is connected with a lightning arrester or a voltage transformer; the rear end of the second sliding contact is fixed on the ground contact seat, and the contact finger at the front end of the second sliding contact is matched with the sheet contact finger of the knife-type contact; the rear end of the third sliding contact is fixed on the isolating switch contact seat, and the contact finger at the front end of the third sliding contact is matched with the sheet contact finger of the knife-type contact.

Preferably, the blade contact is secured to the insulating shaft by a threaded fastener.

Preferably, the rotation driving mechanism comprises a power input shaft, wherein the front end of the power input shaft extends out of the GIS shell and is fixed with the power assembly, and the rear end of the power input shaft is fixedly connected with the insulation shaft through a connecting pin.

Preferably, the first sliding contact, the second sliding contact and the third sliding contact have the same structure.

Preferably, the first sliding contact, the second sliding contact and the third sliding contact are composed of a shielding shell, a contact seat arranged in the shielding shell, a spring, two plum blossom contact fingers and a pin shaft, the two plum blossom contact fingers are connected in series face to face through the pin shaft, and the spring is sleeved on the pin shaft in a pressing mode and on the back face of the plum blossom contact finger.

As a preferable structure, the GIS is integrated in a lightning arrester or a voltage transformer housing by a two-station isolation grounding device. As another preferable structure, the GIS is independently arranged between the GIS isolating switch and the lightning arrester or the voltage transformer by using the two-station isolating grounding device.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, the insulating shaft and the power input shaft are adopted to drive the knife-type contact fixedly connected with the insulating shaft to swing, so that the input and isolation of TV or LA are realized, the insulating shaft realizes interphase insulation and ground insulation, the power input shaft extends out of the GIS air chamber to be connected with the power assembly, and the operation is simple, safe and reliable.

2. The utility model realizes reliable electric contact by adopting the cooperation of the knife-shaped contact and the sliding contact with the plum blossom contact finger, and has simple structure and reliable performance.

3. The two-station isolation grounding device for the GIS can be integrated in the LA or the TV shell, can be arranged between the GIS isolating switch and the LA or the TV as an independent module, and has flexible installation structure and strong applicability.

Drawings

FIG. 1 is a schematic diagram of a two-station isolation grounding device for GIS;

FIG. 2 is a schematic diagram II of a two-station isolated grounding device for GIS;

FIG. 3 is a schematic view of a blade contact connection structure according to an embodiment of the present utility model;

fig. 4 is a schematic diagram of a connection structure between a contact base and a third sliding contact of an isolating switch according to an embodiment of the present utility model;

fig. 5 is a schematic view of a sliding contact structure according to an embodiment of the present utility model.

In the figure: 1. the power input shaft, 2, the connecting pin, 3, the insulating shaft, 4, the knife-shaped contact, 41, the double-sided annular groove, 5, the threaded fastener, 6, the positive contact seat, 7, the ground contact seat, 8, the isolating switch contact seat, 91, the first sliding contact, 92, the second sliding contact, 93, the third sliding contact, 901, the contact seat, 902, the shielding shell, 903, the spring, 904, the plum blossom contact finger, 905, the pin shaft, 100 and the GIS shell.

Detailed Description

In order that the manner in which the above-recited features, advantages, objects and advantages of the present utility model are attained and can be understood in detail, a more particular description of the utility model, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings.

It should be noted that, in the description of the present utility model, the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are directions or positional relationships based on the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model; the terms "first," "second," "third," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "coupled," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally coupled, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. When two elements are "fixedly connected" or "pivotally connected," the two elements may be directly connected or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The fixed connection or the fixed connection mode can be screw connection or welding or riveting or plugging connection or connection through a third component. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1, a two-station isolation grounding device for a GIS in this embodiment is fixed on a positive contact base 6 (three-phase) (the rear end conductor of the positive contact base 6 is connected with a Lightning Arrester (LA) or a voltage Transformer (TV)) and is used for switching the contact state between the positive contact base 6 and a ground contact base 7 (three-phase) and between the positive contact base 6 and an isolation switch contact base 8 (three-phase), so as to realize reliable connection of the Lightning Arrester (LA) or the voltage Transformer (TV) in a working state and isolation grounding of the Lightning Arrester (LA) or the voltage Transformer (TV) in an overhaul state.

The two-station isolation grounding device for the GIS of the embodiment comprises a first sliding contact 91, a knife-type contact 4, a second sliding contact 92, a third sliding contact 93, a power input shaft 1 and an insulation shaft 3.

As shown in fig. 1 and 2, the center of the connecting part of the blade contact 4 is sleeved on the insulating shaft 3 and is fixed on the insulating shaft 3 through a threaded fastener 5; the rear end of the connecting part is provided with a double-sided annular groove 41, and the front end of the connecting part is provided with a sheet-shaped contact finger. As shown in fig. 3, the front end of the insulating shaft 3 is fixedly connected with the power input shaft 1 through a connecting pin 2, and the blade contact 4 can be rotated to swing by rotating a power component connected with the power input shaft 1, such as an operating handle or other power sources (such as a motor and the like). The first sliding contact 91 is fixed on the positive contact seat 6 through a connecting pin shaft, and the contact finger of the first sliding contact is connected with the double-sided annular groove 41 on the knife-type contact 4 in a sliding and electric contact way without separation; the second sliding contact 92 and the third sliding contact 93 are respectively fixed on the ground contact seat 7 and the isolating switch contact seat 8 through connecting pins, and the connecting structure is shown in fig. 3 and 4.

The structure of the sliding contacts 91, 92 and 93 is shown in fig. 5, and the contact is composed of a contact base 901, a shielding shell 902, a spring 903, plum blossom contact fingers 904 and a pin shaft 905, wherein the two plum blossom contact fingers 904 are connected in series face to face through the pin shaft 905, the spring 903 sleeved on the pin shaft 905 in a compressed mode and arranged on the back face of the plum blossom contact finger 904 can ensure the contact pressure of the plum blossom contact fingers 904, the double-sided annular groove 41 of the knife-type contact and the sheet contact fingers, and the reliable electrical connection is ensured.

According to the two-station isolation grounding device for the GIS, external driving force is transmitted to the knife-type contact 4 through the power input shaft 1 and the insulating shaft 3, so that fixed-angle swing of the device is realized. When the blade contact 4 is rotated to the disconnecting switch contact 8 side and the blade contact finger of the blade contact is connected to the third slider 93, LA or TV is connected to the high-voltage conductor, and LA or TV is put into the state as shown in fig. 2. When the blade contact 4 is rotated to the ground contact 7 side and the blade contact finger of the blade contact is connected to the second slider 92, LA or TV is connected to the ground contact 7, and in the ground state, LA or TV is grounded, as shown in fig. 1, at this time, the equipment-related electrical test or repair can be completed. According to the field test requirements of TV, LA, the ground contact 7 can be grounded in two ways: the ground contact 7 can be directly connected with the GIS shell 100 to realize grounding; the insulating seat can be fixed with the GIS shell in an insulating way, and the insulating seat is singly grounded during maintenance or field test.

According to the two-station isolation grounding device for the GIS, the input and isolation of the TV or the LA are realized through the swing of the knife-shaped contact 4, the swing power input shaft is driven to extend out of the GIS air chamber, the isolation action is not required to open the air chamber, and the operation is simple, reliable and safe; moreover, the blade contact 4 is matched with the sliding contacts 91, 92 and 93 with plum blossom contact fingers, so that reliable electric contact is realized, and the structure is simple and the performance is reliable; in addition, the knife-type contact is fixed on the insulating shaft 3, so that the phase insulation and the ground insulation are realized while the reliable transmission is realized, and the structure is simple and the performance is reliable. The isolating and grounding device can be integrated in an LA or TV shell, can also be arranged between a GIS isolating switch and the LA or the TV as an independent module, and has flexible installation structure and strong applicability.

Claims

1. The two-station isolation grounding device for the GIS is characterized by comprising an insulating shaft (3), a knife-type contact (4), a first sliding contact (91), a second sliding contact (92) and a third sliding contact (93); wherein,

the front end of the insulating shaft (3) is connected with the rotation driving mechanism;

the knife-type contact (4) comprises an annular connecting part and a sheet-shaped contact finger at the front end of the connecting part, the center of the connecting part is sleeved and fixed on the insulating shaft (3), and the rear end of the connecting part is provided with a double-sided annular groove (41);

the rear end of the first sliding contact (91) is fixed on the positive contact seat (6), and the contact finger at the front end of the first sliding contact is connected with the double-sided annular groove (41) in a sliding and electric contact way without separation;

the rear end of the second sliding contact (92) is fixed on the ground contact seat (7), and the contact finger at the front end of the second sliding contact is matched with the sheet contact finger of the knife-type contact (4);

the rear end of the third sliding contact (93) is fixed on the isolating switch contact seat (8), and the contact finger at the front end of the third sliding contact is matched with the sheet contact finger of the knife-type contact (4).

2. A two-station isolation grounding device for GIS as set forth in claim 1, wherein,

the blade contact (4) is fixed on the insulating shaft (3) through a threaded fastener (5).

3. A two-station isolation grounding device for GIS as set forth in claim 1, wherein,

the rotary driving mechanism comprises a power input shaft (1), the front end of the power input shaft (1) extends out of the GIS shell (100) and is fixed with the power assembly, and the rear end of the power input shaft is fixedly connected with the insulating shaft (3) through a connecting pin (2).

4. A two-station isolation grounding device for GIS as set forth in claim 1, wherein,

the first sliding contact (91), the second sliding contact (92) and the third sliding contact (93) have the same structure.

5. A two-station isolation grounding device for GIS as set forth in claim 1, wherein,

the first sliding contact (91), the second sliding contact (92) and the third sliding contact (93) are composed of a shielding shell (902), a contact seat (901) arranged in the shielding shell, a spring (903), two plum blossom contact fingers (904) and a pin shaft (905), the two plum blossom contact fingers (904) are connected in series face to face through the pin shaft (905), and the spring (903) is sleeved on the pin shaft (905) in a pressing mode and is arranged on the back face of the plum blossom contact finger (904).

6. A two-station isolation grounding device for a GIS according to claim 1, wherein the two-station isolation grounding device for a GIS is integrated in a lightning arrester or a voltage transformer housing.

7. A two-station isolation grounding device for GIS as set forth in claim 1, wherein,

the GIS is independently arranged between the GIS isolating switch and the lightning arrester or the voltage transformer by using the two-station isolating grounding device.