CN202178527U - Linear grounding switch - Google Patents

Abstract

The utility model discloses a linear grounding switch. A three-phase movable contact is arranged in a crank arm box, and the three-phase movable contact extends into a casing, and a switch for conductive contact with the three-phase movable contact is arranged in the casing. For the middle conductive contact, the housing is also provided with a three-phase static contact for on-off cooperation with the three-phase moving contact, and a grounding insulator is also provided between the housing and the crank box, and the grounding insulator is arranged along the three-phase There are three phase-moving contacts arranged in sequence corresponding to the extending direction, and each ground insulator corresponds to a phase-moving contact, and each ground insulator is provided with a perforation for the corresponding moving contact to pass through. The three-phase intermediate conductive contacts are correspondingly fixed on the grounding insulators, and each grounding insulator is provided with a grounding conductor electrically connected to the corresponding intermediate conductive contacts for leading out the ground. The internal stress of each grounding insulator is small, which prolongs the service life of the grounding insulator and improves the safety performance of the grounding switch.

Description

A linear grounding switch

technical field

The utility model belongs to the technical field of high-voltage electrical appliances, in particular to a linear grounding switch.

Background technique

At present, the high-voltage gas-insulated switchgear with three-phase common tank in the power system, that is, the linear grounding switch on the GIS product, is mainly used for the linear grounding of the main circuit. The linear grounding switch must meet the following functions: 1. Working grounding, suitable for static electricity and the ability of the electromagnetic induction ammeter to close the peak current; 2. When measuring resistance and debugging the characteristics of the circuit breaker, the main circuit is insulated from the main body to facilitate the introduction of signals. The linear grounding switch used in the high-voltage GIS mainly includes a shell and a crank box, and a disc insulator as a linear grounding insulator is arranged between the shell and the crank box, and a three-phase central conductor is embedded in the disc insulator. The arm box is provided with a driving crank arm, which is used to drive the action of the three-phase moving contact in the arm box, and the housing is provided with three three-phase intermediate contacts for reliable contact and conduction with the three-phase moving contact. The three-phase moving contacts in the crank box pass through the linear grounding insulator and are always in reliable conductive contact with the three-phase intermediate conductive contacts. There are also three-phase static contacts in the housing for conductive connection with the three-phase moving contacts. When the three-phase moving contact is driven by the driving arm, the three-phase moving contact is electrically connected or disconnected from the three-phase static contact in the housing, so that the middle conductive contact is electrically connected to the three-phase static contact Or disconnect, and realize grounding when the middle conductive contact is electrically connected with the three-phase static contact. After the three-phase moving contact, the three-phase intermediate conductive contact and the corresponding static contact are electrically connected, the three-phase central conductor in the linear grounding insulator is in reliable conductive contact with the three-phase static contact through the three-phase intermediate conductive contact , the three-phase center conductor is drawn out at the lead-out port of the grounding switch. Because the coefficient of expansion of the material constituting the linear ground insulator is quite different from that of the center conductor material, when the above-mentioned ground switch equipped with such a linear ground insulator is used in a low-temperature environment, as the temperature changes, the linear ground insulator is likely to appear due to heat. The uneven internal stress caused by expansion and contraction leads to cracking, which affects the normal use of the linear grounding switch.

Utility model content

The purpose of the utility model is to provide a linear grounding switch to solve the technical problem of cracking of the grounding insulator in the prior art due to uneven internal stress caused by thermal expansion and contraction.

In order to achieve the above purpose, the utility model adopts the following technical solutions: a linear grounding switch, including a housing and a crank box, in which a driving crank arm and a three-phase moving contact driven by the driving crank arm are arranged, The three-phase moving contacts extend into the casing, and the middle conductive contacts for making conductive contact with the three-phase moving contacts are arranged in the casing, and the casing is also provided with the middle conductive contacts for connecting with the three-phase moving contacts. The three-phase static contacts with on-off matching are also provided with grounding insulators between the housing and the crank box, and the grounding insulators are arranged in sequence along the arrangement and extension direction of the three-phase moving contacts. There are three, and each ground insulator corresponds to a phase moving contact, and each ground insulator is provided with a perforation for the corresponding moving contact to pass through, and the three-phase middle conductive contact corresponds to The grounding insulators are fixed on the grounding insulators, and each grounding insulator is provided with a grounding conductor that is conductively connected to the corresponding intermediate conductive contact and is used for leading out the grounding.

The side of each ground insulator facing the three-phase intermediate conductive contact is fixed with an electrical connection fixture that is in conductive communication with the ground conductor, and each of the three-phase intermediate conductive contacts is electrically connected. The contacts are all fixed on corresponding electrical connection fixtures.

A receiving groove is provided on the side of the grounding insulator facing the three-phase static contact at a position corresponding to the electrical connection fixture, and the electrical connection fixture is embedded and fixed in the accommodation groove.

Transition flanges for protecting the grounding insulators are fixed on the circumferential outer sides of the three grounding insulators.

The grounding conductor of the grounding insulator is provided with a grounding plate assembly which is in conductive contact with the grounding conductor and is used to lead out the grounding.

A sealing ring groove is formed on the outer circumferential side of each perforation on the two sides of each grounding insulator corresponding to the housing and the crank box, and a sealing ring is arranged in the sealing ring groove.

The beneficial effects of the utility model are: in the linear grounding switch provided by the utility model, three grounding insulators are arranged between the crank box and the housing, and each grounding insulator corresponds to one of the three-phase moving contacts , the ground insulator is provided with a through hole for the moving contact to pass through, the three-phase intermediate conductive contact is correspondingly fixed on the ground insulator, and the intermediate conductive contact is connected to the ground conductor on the corresponding ground insulator Conductive connection, so that when the crank arm is driven to drive the moving contact to realize the conductive contact between the three-phase moving contact and the three-phase static contact in the housing, the three-phase static contact passes through the three-phase moving contact, the middle conductive contact, The grounding conductor is grounded, thus ensuring the normal operation of the grounding switch. Because three grounding insulators are installed, this can effectively reduce the problem of uneven internal stress caused by thermal expansion and contraction inside the original single large grounding insulator. The internal stress of each grounding insulator is small, effectively extending the The service life of the grounding insulator improves the safety performance of the grounding switch.

Description of drawings

Fig. 1 is the structural representation of a kind of embodiment of the utility model;

Fig. 2 is the K direction view among Fig. 1;

Fig. 3 is a sectional view at A-A in Fig. 1 .

Detailed ways

As shown in Figure 1, Figure 2, and Figure 3, the linear grounding switch for GIS includes a crank box 4 and a housing 3, and a grounding insulator 1 is arranged between the crank box 4 and the housing 3, and the crank box 4 The drive arm 8 and the three-phase moving contact assembly driven by the driving arm 8 are arranged in the center, the three-phase moving contact assembly includes a transmission structure connected with the driving arm 8 and a three-phase moving contact 5 that acts synchronously, The housing 3 is provided with a three-phase intermediate conductive contact 2 for corresponding conductive contact with the three-phase moving contact 5 in the crank box, and the housing 3 is also provided with a three-phase moving contact 5 for realizing Three-phase static contacts with on-off coordination (not shown in the figure), when the three-phase static contacts are connected to the three-phase moving contacts, the three-phase static contacts are grounded. In this embodiment, the three-phase intermediate conductive contacts The two ends are fixedly arranged on the grounding insulator 1. In this embodiment, three grounding insulators 1 are arranged in sequence along the arrangement and extension direction of the three-phase moving contacts. Each grounding insulator corresponds to a moving contact. Each grounding insulator 1 are provided with perforations 10 through which active corresponding moving contacts pass, and each grounding insulator is provided with a grounding conductor 13 conductively connected to the corresponding static contact for leading out grounding, and each grounding insulator 1 Accommodating grooves 11 are arranged on the side facing the three-phase intermediate conductive contacts, and an electrical connection fixture 12 electrically connected to the ground conductor is embedded and fixed in each accommodating groove 11. The three-phase intermediate conductive contacts The middle conductive contact 2 in the head is fixed on the corresponding electrical connection fixture 12. In this embodiment, the three-phase moving contact 5 passes through the electrical connection fixture 12, and on the electrical connection fixture 12 There is a via hole for the moving contact to pass through. Under the action of the driving crank arm, the three-phase moving contact passes through the grounding insulator, electrically connects the fixing piece, and then cooperates with the three-phase intermediate conductive contact conductive sliding plug. The intermediate conductive contact is conductively connected to the grounding conductor 13 through the electrical connection fixture 12. In this embodiment, a grounding transition flange 9 for protecting the grounding insulators is also fixed on the outer circumferential side of the three grounding insulators 1. , and the grounding conductor on the grounding insulator is provided with a grounding plate assembly 14 that is in conductive contact with the grounding conductor and is used to lead out the grounding.

Because the three-phase moving contact goes out of the crank box and goes deep into the housing under the action of the driving crank arm, there are corresponding installations for the moving contact to pass through at the corresponding positions of the crank box and the housing. Holes, because SF ₆ gas is installed in the casing and the crank box of the grounding switch to improve the performance of the grounding switch, so in order to ensure the airtightness of the whole grounding switch, the grounding insulator located between the crank box and the shell is set There is a sealing structure. In this embodiment, the sealing structure means that each ground insulator is provided with a sealing ring groove on the outer circumferential side of each perforation on the two sides of each grounding insulator corresponding to the housing and the crank box. The sealing ring groove is provided with a sealing ring 6, and the sealing ring is located on the circumferential outside of the hole on the housing and the crank box for the moving contact to pass through, so as to ensure the air tightness of the grounding switch and improve the safety of the grounding switch. safety performance.

When the grounding switch provided by the above embodiment is in use, the crank arm 8 is driven to drive the three-phase moving contact to move, and the moving contact 5 is in sliding conductive contact with the corresponding intermediate contact 2. When the three-phase moving contact is in contact with the housing When the three-phase static contacts are in conductive contact, the three-phase static contacts realize conductive connection through the three-phase moving contacts, three-phase intermediate conductive contacts, electrical connection fixtures and grounding conductors, and finally lead out from the grounding on the grounding plate assembly. terminal leads to ground.

The three grounding insulators in the above embodiment lead out the grounding to realize the normal operation of the grounding switch while ensuring that the shell and the crank box are not charged, because the internal stress of the three grounding insulators is small, which effectively avoids The cracking improves the safety and service life of the grounding switch.

Claims (6)

1. A linear grounding switch, comprising a housing and a crank box, in which a driving crank arm and a three-phase moving contact driven by the driving crank arm are arranged, and the three-phase moving contact extends into the shell In the body, an intermediate conductive contact for conducting conductive contact with the three-phase moving contact is arranged in the casing, and a three-phase static contact for on-off cooperation with the three-phase moving contact is also arranged in the casing, Grounding insulators are also provided between the housing and the crank box, and the feature is that: three grounding insulators are arranged in sequence correspondingly along the arrangement and extension direction of the three-phase moving contacts, and each of the Each ground insulator corresponds to a phase moving contact, and each ground insulator is provided with a perforation for the corresponding moving contact to pass through, and the three-phase middle conductive contact is correspondingly fixed on the said On the grounding insulators, each grounding insulator is provided with a grounding conductor which is conductively connected with the corresponding intermediate conductive contact and is used for leading out the grounding. 2. The linear grounding switch according to claim 1, characterized in that: each of the grounding insulators is fixed on the side facing the three-phase intermediate conductive contact with an electrical connection and fixing device electrically connected to the grounding conductor. Each intermediate conductive contact in the three-phase intermediate conductive contacts is fixed on the corresponding electrical connection fixture. 3. The linear grounding switch according to claim 2, characterized in that: the side of the grounding insulator facing the three-phase static contact is provided with a receiving groove at a position corresponding to the electrical connection fixture, the The electrical connection fixture is embedded and fixed in the receiving groove. 4. The linear grounding switch according to claim 1, 2 or 3, characterized in that a transition flange for protecting the grounding insulators is fixed on the outside of the circumference of the three grounding insulators. 5. The linear grounding switch according to claim 1, 2 or 3, characterized in that: the grounding conductor of the grounding insulator is provided with a grounding plate assembly which is in conductive contact with the grounding conductor and used to lead out the grounding. 6. The linear grounding switch according to claim 1, 2 or 3, characterized in that: the two sides of each grounding insulator facing the housing and the crank box are on the outer side of each perforation in the circumferential direction. A sealing ring groove is opened, and a sealing ring is arranged in the sealing ring groove.

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