CN205621699U - Combination switch equipment of earthing switch and circuit breaker is kept apart to three stations - Google Patents

Abstract

The utility model discloses a combined switchgear of a three-station isolation grounding switch and a circuit breaker, comprising: the top end of a soft connection 23 is welded to the bottom end of an isolation grounding movable contact 22, thereby forming a group of electrical connection structures of the movable contacts ; The three sets of moving contact electrical connection structures are fixed side by side in the insulating housing 21 of the isolating grounding switch; 13 are electrically connected, and each circuit breaker incoming line terminal 13 is electrically connected with a soft connection 23; the isolation grounding switch main shaft 4 drives the isolation grounding moving contact 22 of the electrical connection structure of three sets of moving contacts to the isolating switch static contact 24 , the floating isolation position and the static contact 25 of the grounding switch are switched. The utility model has compact structure, saves space, reduces connecting parts, improves safety, reliability and stability of electrical connection, reduces failure probability, saves cost and improves production efficiency.

Description

A combined switchgear of a three-position isolating grounding switch and a circuit breaker

technical field

The utility model relates to the technical field of switchgear, in particular to a combined switchgear of a three-station isolating grounding switch and a circuit breaker.

Background technique

In the existing switchgear, circuit breakers, disconnectors and earthing switches are all important components in the primary electrical circuit. The circuit breaker is mainly composed of circuit breaker insulation, circuit breaker interrupter, circuit breaker incoming terminal (also often called circuit breaker upper terminal), circuit breaker outgoing terminal (also often called circuit breaker lower terminal) , circuit breaker operating mechanism and other components, while the isolating switch and the grounding switch are mostly independent knife switch structures; the circuit breaker and the isolating switch are mostly connected by hard bus bars such as copper bars, and the hard bus bar and the isolating switch are connected. Between the hard busbar and the circuit breaker are connected by a spring pressure mechanism.

In order to switch ABC three-phase electricity at the same time, a three-phase isolating switch for switching three-phase electricity and a three-phase circuit breaker for switching three-phase electricity are usually installed in the switchgear; three-phase The main structure of the circuit breaker includes three circuit breaker arc extinguishing chambers, three circuit breaker incoming terminals, three circuit breaker outgoing terminals, a circuit breaker main shaft and a set of circuit breaker operating mechanism, and the dynamics of the three circuit breaker arc extinguishing chambers. The contacts are all connected to the main shaft of the circuit breaker, and the operating mechanism of the circuit breaker can drive the main shaft of the circuit breaker to rotate, so that the circuit breaker can switch on and off the ABC three-phase power at the same time; the main structure of the three-phase isolating switch includes three static contacts of the isolating switch head, three isolating switch moving contacts, one isolating switch main shaft and a set of isolating switch operating mechanism. The main shaft of the switch rotates, so that the isolating switch can switch on and off the ABC three-phase electricity at the same time.

With the development of science and technology, most of the existing switch cabinets use three-position isolating and grounding switches, which integrate the functions of both the isolating switch and the grounding switch, and can move to three different positions through one isolating and grounding movable contact To realize the three functions of isolating switch closing, isolating switch opening and grounding. The isolation grounding moving contact of the existing three-position isolation grounding switch is mostly composed of two symmetrical gate blades, the tops of these two gate blades are used for switching between three different stations, and the two gate blades The bottom end of the blade is hinged to the mounting seat of the moving contact, and is pressed by an elastic pressing mechanism, so that the bottom end of the isolated grounding moving contact and the mounting seat of the moving contact are in contact with each other by "relying on the surface contact of the elastic pressing mechanism." " to make the connection.

It can be seen from the structure of the circuit breaker, isolating switch and grounding switch in the existing switchgear above that the circuit breaker, isolating switch and grounding switch in the existing switchgear have at least the following disadvantages:

First, in the existing switchgear, the circuit breaker, isolating switch and grounding switch are mostly independent devices, which not only occupy a large space, but also have many connection links between the circuit breaker and the isolating switch, and the reliability of the electrical connection is poor. The loop resistance is large, the heat is large, and there is a large potential safety hazard.

Second. In the existing switchgear, the isolating switch moving contact of the isolating switch needs to be connected to the main shaft of the isolating switch through a series of transmission parts, and the parts where each transmission part is connected to each other may become a point of failure, which is undoubtedly Increased the probability of failure, increased security risks.

Third, in the existing switchgear, the isolated grounding moving contact of the three-position isolating grounding switch needs to be connected to the primary electrical circuit through the moving contact mounting seat and the moving contact terminal in turn, so the isolated grounding moving contact and There are many components between the primary electrical circuits, and the parts connected to each component may become a point of failure, which not only increases the probability of failure, but also increases safety hazards.

Fourth, in the existing switchgear, the connection mode between the isolated grounding moving contact of the three-position isolating grounding switch and the moving contact mounting seat is "relying on the surface contact of the elastic compression mechanism", so if the elastic compression The compression spring of the mechanism itself is unstable in elasticity, or the compression degree of the compression spring is too small during assembly, or the elasticity of the compression spring decreases due to heat, then the contact between the isolated grounding moving contact and the moving contact mounting seat is easy to occur Poor contact resistance, increased heat generation, etc., especially when passing or closing a short-circuit current, such poor contact may seriously endanger the safety of equipment and personnel.

Fourth, in the existing switchgear, the moving contact mounting seat of the three-station isolating grounding switch requires high processing precision and low processing efficiency.

Contents of the invention

Aiming at the above shortcomings in the prior art, the utility model provides a combination switchgear of a three-position isolating grounding switch and a circuit breaker, which not only has a compact structure, but also saves the need for circuit breakers, isolating switches, and grounding switches in the switch cabinet. It occupies less space and reduces the connecting parts between the circuit breaker and the isolating switch and between the isolating grounding moving contact and the main shaft of the isolating switch, thereby improving the three-position isolating and grounding switch itself and the three-position isolating and grounding switch and the breaking circuit. The safety, reliability and stability of the electrical connection between devices reduces the probability of failure, saves material costs and processing costs, and improves production efficiency.

The purpose of this utility model is achieved by the following technical solutions:

A combined switchgear of a three-position isolating grounding switch and a circuit breaker, which is used to connect to a primary main circuit and a grounding circuit, comprising: a three-phase circuit breaker 1, a three-position isolating grounding switch 2 and an isolating grounding switch main shaft 4; The three-position isolating grounding switch 2 includes an isolating grounding switch insulating case 21, an isolating grounding movable contact 22, a soft connection 23, a isolating switch static contact 24 and a grounding switch static contact 25; the top of the flexible connection 23 is welded on the The bottom end of the moving contact 22 constitutes a group of moving contact electrical connection structures; three sets of moving contact electrical connection structures are fixed side by side in the insulating housing 21 of the isolating grounding switch, and in each group of moving contact electrical connection structures, The top of the isolated grounding movable contact 22 protrudes from the top of the isolating grounding switch insulating housing 21, and the bottom end of the flexible connection 23 protrudes from the bottom of the isolating grounding switch insulating housing 21; The bottom ends of the connections 23 are electrically connected to a circuit breaker incoming terminal 13 of the three-phase circuit breaker 1, and each circuit breaker incoming terminal 13 of the three-phase circuit breaker 1 is electrically connected to a soft connection 23; the isolation grounding switch The main shaft 4 is fixed on the two ends of the insulating housing 21 of the isolation and grounding switch, and drives the isolation and grounding movable contact 22 of the electrical connection structure of three groups of moving contacts to the static contact 24 of the isolating switch, the suspended isolation position and the static contact of the grounding switch 25 switching between.

Preferably, the bottom end of the flexible connection 23 is directly electrically connected to the circuit breaker incoming terminal 13 of the three-phase circuit breaker 1 through the conductive bolt 3 .

Preferably, the isolated grounding moving contact 22 includes a knife clip 22a, a stud 22b, a compression nut 22c and a compression spring 22d; the bottom end of the knife clip 22a is welded to the flexible connection 23, and The top of the knife clip 22a is used to contact the static contact 11 of the isolating switch and the static contact 61 of the grounding switch; the top of the knife clip 22a includes two symmetrical gate blades; the double-ended stud 22b passes through the two symmetrical gates Blade, and the two ends of the double-ended stud 22b are respectively provided with a set of compression nuts 22c and compression springs 22d, thereby constituting the elastic compression mechanism of the knife clip 22a.

Preferably, the two ends of the soft connection 23 , the solder joints between the soft connection 23 and the isolated ground moving contact 22 , and the entire isolated ground moving contact 22 are plated with silver or tin.

Preferably, the soft connection 23 is formed by cold-pressing bare copper wires or tin-copper braided wires.

Preferably, the static contact 24 of the isolating switch is directly electrically connected to the busbar in the primary main circuit or the conductor in the bushing, and the static contact 25 of the earthing switch is directly electrically connected to the grounding busbar in the grounding circuit.

Preferably, the isolating and grounding switch insulating housing 21 includes three moving contact housings 21a and two shaft plates 21b; each group of moving contact electrical connection structures is fixed in a different moving contact housing 21a, And in each group of moving contact electrical connection structures, the top of the isolated ground moving contact 22 protrudes from the top of the moving contact housing 21a, and the bottom end of the flexible connection 23 protrudes from the bottom of the moving contact housing 21a; The left and right ends of each movable contact housing 21a are provided with connectors 21c; the three movable contact housings 21a are connected in series through the connectors 21c, and the leftmost movable contact housing 21a is connected through its left end. The head 21c is connected and fixed with a shaft disk 21b, and the movable contact housing 21a at the right end is connected and fixed with the other shaft disk 21b through the connecting head 21c at the right end; The outer side of the disc 21b is fixed coaxially.

It can be seen from the above-mentioned technical solution provided by the utility model that the combined switchgear provided by the embodiment of the utility model of the three-position isolating grounding switch and the circuit breaker connects the three flexible connections 23 of the three-position isolating grounding switch 2 directly respectively. It is electrically connected to a circuit breaker incoming line terminal 13 of the three-phase circuit breaker 1, and the top of each circuit breaker incoming line terminal 13 of the three-phase circuit breaker 1 is electrically connected to a soft connection 23, thereby realizing the three-station The isolating grounding switch is integrated with the three-phase circuit breaker 1, and there is no electrical connection between the soft connection 23 and the circuit breaker incoming terminal 13 through other cables, which not only saves the space occupied in the switch cabinet, but also reduces The connection parts between the three-position isolating grounding switch and the three-phase circuit breaker 1 are eliminated, and the connection between the three-position isolating grounding switch and the three-phase circuit breaker 1 is avoided by the "surface contact relying on the elastic compression mechanism" Many shortcomings of the method can effectively reduce the mechanical impact on the primary electrical circuit, reduce the number of fault points, reduce the probability of failure, and improve the reliability, stability and safety of electrical connections. At the same time, the combined switchgear of the three-position isolating and grounding switch and the circuit breaker directly fixes the electrical connection structures of the three groups of moving contacts of the three-position isolating and grounding switch 2 side by side in the insulating housing 21 of the isolating and grounding switch, and the isolating and grounding switch The main shaft 4 is fixed on both ends of the insulating case 21 of the isolating and grounding switch, so there are no other connecting parts between the main shaft 4 of the isolating and grounding switch and the movable contact 22 of the isolating and grounding switch except the insulating case 21 of the isolating and grounding switch, which reduces the The connecting part between the switch main shaft 4 and the isolated grounding moving contact 22 can not only improve switching accuracy and switching speed, but also reduce the number of fault points and the probability of fault occurrence. In addition, the combination switchgear of the three-position isolation grounding switch and circuit breaker adopts the method of welding the soft connection 23 and the isolation grounding moving contact 22 instead of the moving contact mounting seat and moving contact terminal in the prior art. Because the flexible connection 23 has soft characteristics, when the isolated grounding movable contact 22 moves with the isolating grounding switch main shaft 4, the flexible connection 23 welded with the isolated grounding movable contact 22 only needs to be bent to different degrees. Yes; this reduces the number of connecting parts between the isolated grounding moving contact 22 and the three-phase circuit breaker 1, and the "surface contact relying on the elastic compression mechanism" is avoided between the soft connection 23 and the isolated grounding moving contact 22. Many shortcomings of this connection method can effectively reduce the mechanical impact on the primary electrical circuit, reduce the probability of failure, improve connection reliability and stability, and save production costs.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention , for those skilled in the art, other drawings can also be obtained based on these drawings without creative work.

Fig. 1 is a structural schematic diagram 1 of a combined switchgear of a three-position isolating grounding switch and a circuit breaker provided by an embodiment of the utility model.

Fig. 2 is the second structural diagram of the combined switchgear of the three-position isolating grounding switch and circuit breaker provided by the embodiment of the utility model.

Fig. 3 is a structural schematic diagram 1 of the three-position isolating grounding switch provided by the embodiment of the present invention.

Fig. 4 is the second structural diagram of the three-position isolating grounding switch provided by the embodiment of the present invention.

Fig. 5 is a structural schematic diagram III of the three-position isolating grounding switch provided by the embodiment of the present invention.

FIG. 6 is a first structural schematic diagram of the isolated grounding movable contact 22 provided by the embodiment of the present invention.

FIG. 7 is a second structural schematic diagram of the isolated grounding movable contact 22 provided by the embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. . Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

First of all, it should be noted that the directional words and phrases such as "up", "down", "left", "right", "top" and "bottom" described in this application document are only for clearly showing The relative positional relationship between components, when the placement direction changes, the directions of "up", "down", "left", "right", "top" and "bottom" will also change accordingly, but this still belongs to protection scope of this application. The combined switchgear of the three-position isolating grounding switch and the circuit breaker provided by the utility model will be described in detail below.

As shown in Figures 1 to 7, a combined switchgear of a three-position isolating grounding switch and a circuit breaker is used to connect to the primary main circuit and the grounding circuit. Its specific structure includes: three-phase circuit breaker 1, three-phase One-position isolating grounding switch 2 and main shaft 4 of isolating grounding switch; three-position isolating grounding switch 2 includes isolating grounding switch insulating case 21, isolating grounding movable contact 22, soft connection 23, isolating switch static contact 24 and grounding switch static contact head 25; the top end of the soft connection 23 is welded to the bottom end of the isolated grounding movable contact 22, thereby forming a set of electrical connection structures of the movable contacts; , and in the electrical connection structure of each group of movable contacts, the top of the isolated grounding movable contact 22 protrudes from the top of the isolating grounding switch insulating shell 21, and the bottom end of the flexible connection 23 extends from the bottom of the isolating grounding switch insulating shell 21 out; the bottom ends of the flexible connections 23 of the three sets of moving contact electrical connection structures are electrically connected to a circuit breaker incoming line terminal 13 of the three-phase circuit breaker 1, and each circuit breaker incoming line terminal 13 of the three-phase circuit breaker 1 Each is electrically connected with a soft connection 23; the isolation grounding switch main shaft 4 is fixed on both ends of the isolation grounding switch insulation housing 21, and drives the isolation grounding moving contact 22 of the electrical connection structure of three groups of moving contacts to the isolating switch static contact 24. Switch between the suspended isolation position and the static contact 25 of the grounding switch. The isolating switch static contact 24 is used for direct electrical connection with the busbar in the primary main circuit or the conductor in the bushing, and the grounding switch static contact 25 is used for direct electrical connection with the grounding busbar in the grounding circuit.

Specifically, the combined switchgear of the three-position isolating grounding switch and circuit breaker may include the following implementations:

(1) As shown in Figures 1 and 2, the main structure of a three-phase circuit breaker 1 may include three circuit breaker insulators 11, three circuit breaker arc extinguishing chambers 12, three circuit breaker incoming terminals 13, three The circuit breaker outlet terminal, a circuit breaker main shaft 5 and a set of circuit breaker operating mechanism 7; It is electrically connected to one end of the circuit breaker arc extinguishing chamber 12, and the top of the circuit breaker incoming terminal 13 protrudes from the upper part of the circuit breaker insulator 11; the moving contacts of the three circuit breaker arc extinguishing chambers 12 are all connected to the main shaft of the circuit breaker 5, the circuit breaker operating mechanism 7 can drive the circuit breaker main shaft 5 to rotate, so that the three-phase circuit breaker 1 can switch ABC three-phase electricity at the same time. The bottom ends of the three soft connections 23 of the three-position isolating grounding switch 2 are respectively directly electrically connected to a circuit breaker incoming line terminal 13 of the three-phase circuit breaker 1, and each circuit breaker incoming line terminal 13 of the three-phase circuit breaker 1 The top ends of each are electrically connected to a soft connection 23, thereby realizing the connection of the three-position isolating grounding switch and the three-phase circuit breaker 1 as a whole, and there is no other cable between the soft connection 23 and the circuit breaker incoming terminal 13 Electrical connection, which not only reduces the connecting parts between the three-position isolating grounding switch and the three-phase circuit breaker 1, but also avoids the occurrence of "depending on the elastic compression mechanism" between the three-position isolating grounding switch and the three-phase circuit breaker 1 The many shortcomings of this connection method can effectively reduce the mechanical impact on the primary electrical circuit, reduce the number of fault points, reduce the probability of failure, and improve the reliability, stability and safety of electrical connections.

In practical applications, the bottom end of the soft connection 23 is preferably directly electrically connected to the circuit breaker incoming terminal 13 of the three-phase circuit breaker 1 through the conductive bolt 3, which not only ensures the connection between the soft connection 23 and the circuit breaker incoming terminal 13 The reliability of the electrical connection can be effectively reduced, and the connection parts between the soft connection 23 and the circuit breaker incoming terminal 13 can be effectively reduced. This connection mode can not only guarantee the safety and reliability of the electrical connection between the three-position isolating grounding switch and the three-phase circuit breaker 1, but also reduce the contact resistance and heat generation, which can make the three-position The combined switchgear of the isolating grounding switch and the circuit breaker achieves the dual purposes of electrical safety, energy saving and emission reduction.

(2) As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, since the electrical connection structures of the three groups of moving contacts of the three-position isolating and grounding switch 2 are fixed side by side in the insulating housing 21 of the isolating and grounding switch, And the electrical connection structures of each group of moving contacts are not conductive to each other, and the main shaft 4 of the isolating grounding switch is fixed at both ends of the insulating housing 21 of the isolating grounding switch, so when the main shaft 4 of the isolating grounding switch rotates, the insulating housing of the isolating grounding switch 21 will rotate under the drive of the isolating and grounding switch main shaft 4, and the electrical connection structure of the three groups of moving contacts fixed in the isolating and grounding switch insulating shell 21 will be driven by the isolating and grounding switch insulating shell 21 with the isolating and grounding switch The insulating shell 21 moves together, so that the isolated grounding switch operating mechanism 6 only needs to drive the main shaft 4 of the isolating grounding switch to rotate, and the isolated grounding movable contact 22 of the electrical connection structure of three sets of moving contacts can simultaneously switch the ABC three-phase power . In this process, the isolation and grounding switch main shaft 4 directly drives the isolation and grounding switch insulation housing 21, and the isolation and grounding switch insulation housing 21 directly drives the isolation and grounding movable contact 22, so the isolation and grounding switch main shaft 4 and the isolation and grounding switch The contacts 22 do not contain other connecting parts except the insulating housing 21 of the isolating and grounding switch, which reduces the connecting parts between the main shaft 4 of the isolating and grounding switch and the moving contact 22 of the isolating and grounding switch, thereby not only improving the three-position isolation The switching accuracy and switching speed of the grounding switch during three-position switching, and the number of fault points between the main shaft 4 of the isolation grounding switch and the moving contact 22 of the isolation grounding switch are reduced, the probability of failure is reduced, and the reliability of electrical connection is improved. , stability and security, but also save production costs.

(3) As shown in Fig. 3, Fig. 4 and Fig. 5, the insulating housing 21 of the isolating and earthing switch includes three moving contact housings 21a and two shaft discs 21b; Fixed in different moving contact housings 21a, and in the electrical connection structure of each group of moving contacts, the top end of the isolated grounding moving contact 22 protrudes from the top of the moving contact housing 21a, and the bottom end of the flexible connection 23 is formed by The bottom of the movable contact housing 21a protrudes; the left and right ends of each movable contact housing 21a are provided with connectors 21c; the three movable contact housings 21a are connected in series through the connectors 21c, and the leftmost The movable contact housing 21a of the left end is connected and fixed to a shaft disk 21b through the connector 21c at the left end, and the movable contact housing 21a at the rightmost end is connected and fixed with the other shaft disk 21b through the connector 21c at the right end; isolation grounding The switch main shaft 4 includes two sections, one of which is the active section shaft of the isolation grounding switch main shaft 4, and the other end is the driven section shaft of the isolation grounding switch main shaft 4. Pack. In this method, a group of moving contact electrical connection structures and a moving contact housing 21a are processed as one, and then the moving contact housing 21a, the shaft plate 21b and the isolation grounding switch main shaft 4 are assembled into a complete three-position isolation The processing method of the grounding switch can not only improve the processing efficiency in mass production, but also make the three-position isolating grounding switch convenient for transportation, installation and maintenance.

(4) Since the flexible connection 23 has soft characteristics, when the isolated grounding movable contact 22 rotates with the isolating grounding switch main shaft 4, the flexible connection 23 welded with the isolated grounding movable contact 22 only needs to be bent to different degrees, This overcomes the problems of too many parts and excessive mechanical impact on the primary electrical circuit in the prior art in the hinged mode of the moving contact, thereby reducing fault points and reducing the probability of failure of the three-position isolating grounding switch. Extended service life.

In practical applications, the soft connection 23 is preferably cold-pressed with copper foil or tin-copper braided wire, which not only enables the soft connection 23 to carry a relatively large load of current, but also ensures that the soft connection 23 has good flexibility. Therefore, when the isolating and grounding movable contact 22 is opened and closed, the mechanical impact on the primary electrical circuit can be effectively reduced, the probability of failure of the isolating switch can be reduced, and the service life can be prolonged.

(5) As shown in Fig. 5, Fig. 6 and Fig. 7, the top end of the soft connection 23 is welded on the bottom end of the isolated ground moving contact 22 (the top end and the bottom end here are relative to those described in Fig. 5 Positional relationship), which can not only ensure the reliability of the connection between the soft connection 23 and the isolated grounding moving contact 22, but also effectively avoid the "surface contact relying on the elastic compression mechanism" between the soft connection 23 and the isolated grounding moving contact 22 There are many disadvantages of this connection method. In practical applications, the two ends of the soft connection 23, the solder joints between the soft connection 23 and the isolated ground moving contact 22, and the entire isolated ground moving contact 22 are preferably silver-plated or tin-plated, which can not only improve the isolation of the ground moving contact. The electrical conductivity of the head 22 and the soft connection 23 can effectively reduce the contact resistance, and can greatly improve the oxidation resistance of the isolated ground moving contact 22 and the soft connection 23, thereby reducing the probability of failure and prolonging the service life.

(6) As shown in Fig. 5, Fig. 6 and Fig. 7, the isolated grounding moving contact 22 includes a knife clip 22a, a stud 22b, a compression nut 22c and a compression spring 22d (the compression spring 22d can adopt compression spring or disc spring); the bottom end of switch knife clip 22a is welded together with flexible connection 23, and the top of switch knife clip 22a is used for contacting with isolating switch static contact 24 and earthing switch static contact 25; The top of the knife clip 22a includes two symmetrical gate blades; the double-ended stud 22b passes through the two symmetrical gate blades, and a set of compression nuts 22c and compression springs 22d are respectively provided at both ends of the double-ended stud 22b , thereby constituting the elastic pressing mechanism of the knife clip 22a. When the compression nut 22c is screwed into the middle of the double-ended stud 22b, the pressure that the compression spring 22d transmits to the gate blade increases, and the clamping force of the two gate blades increases, thereby improving the clamping force of the gate blade holder 22a. holding power.

In practical application, when the three-position isolating and grounding switch is in the closing position of the isolating switch, the two symmetrical blades at the front end of the knife clip 22a can clamp the static contact 24 of the isolating switch in the middle. The blade can be in better contact with the isolating switch static contact 24 under the inward pressing effect of the compression nut 22c and the compression spring 22d, thereby improving the connection between the isolation grounding movable contact 22 and the isolating switch static contact 24. reliability. When the three-position isolating earthing switch is in the closing position of the earthing switch, the two symmetrical blades at the front end of the knife clamp 22a can clamp the static contact 25 of the earthing switch in the middle, and the two blades are pressed against the nut. 22c and the compression spring 22d can be in better contact with the grounding switch static contact 25 under the inward pressing action, thereby improving the reliability of the connection between the isolated grounding movable contact 22 and the grounding switch static contact 25.

Furthermore, the raw materials of the combined switchgear of the three-position isolating grounding switch and the circuit breaker provided by the embodiment of the utility model are as follows:

(1) The combined switchgear of the three-position isolating grounding switch and circuit breaker directly connects the bottom ends of the three flexible connections 23 of the three-positioning isolating grounding switch 2 to one circuit breaker incoming line terminal 13 of the three-phase circuit breaker 1 respectively. Electrically connected, and the top of each circuit breaker incoming line terminal 13 of the three-phase circuit breaker 1 is electrically connected with a soft connection 23, thereby realizing the connection of the three-position isolating grounding switch and the three-phase circuit breaker 1 as a whole, and There is no electrical connection between the soft connection 23 and the circuit breaker incoming terminal 13 through other cables, which not only reduces the connection parts between the three-position isolating grounding switch and the three-phase circuit breaker 1, but also avoids There are many shortcomings of the connection method of "surface contact relying on elastic compression mechanism" between the isolation grounding switch and the three-phase circuit breaker 1, which can effectively reduce the mechanical impact on the primary electrical circuit, reduce the number of fault points, and reduce the failure rate. chance of occurrence, improving electrical connection reliability, stability and safety.

(2) The combined switchgear of the three-position isolation grounding switch and the circuit breaker directly fixes the electrical connection structure of the three groups of moving contacts of the three-position isolation grounding switch 2 side by side in the insulating housing 21 of the isolation grounding switch, and isolates the grounding The main shaft 4 of the switch is fixed on both ends of the insulating housing 21 of the isolating and grounding switch, so when the main shaft 4 of the isolating and grounding switch rotates, the insulating housing 21 of the isolating and grounding switch will rotate under the drive of the main shaft 4 of the isolating and grounding switch, and be fixed on the isolation and grounding switch The electrical connection structure of the three sets of moving contacts in the insulating housing 21 of the grounding switch will move together with the insulating housing 21 of the isolating grounding switch driven by the insulating housing 21 of the isolation grounding switch, thereby realizing the electrical connection structure of the three sets of moving contacts The isolated grounding movable contact 22 is switched between the three stations of isolating switch closing, isolating switch opening and grounding. There are no other connecting parts between the main shaft 4 of the isolating and grounding switch and the moving contact 22 of the isolating and grounding switch except the insulating case 21 of the isolating and grounding switch, which reduces the number of connecting parts between the main shaft 4 of the isolating and grounding switch and the moving contact 22 of the isolating and grounding switch, Therefore, not only can the switching accuracy and switching speed of the three-position isolating grounding switch be improved during three-position switching, but also the number of fault points between the main shaft 4 of the isolating grounding switch and the moving contact 22 of the isolating grounding switch can be reduced, thereby reducing fault Occurrence probability is improved, electrical connection reliability, stability and safety are improved, and production costs are also saved.

(3) The combination switchgear of the three-position isolating grounding switch and circuit breaker adopts the method of welding the soft connection 23 and the isolating grounding moving contact 22 to replace the moving contact mounting seat and the moving contact terminal in the prior art. In the main electrical connection structure, since the flexible connection 23 has soft characteristics, when the isolated grounding movable contact 22 moves with the isolating grounding switch main shaft 4, the flexible connection 23 welded with the isolated grounding movable contact 22 only needs to be bent to different degrees That is enough; this reduces the connecting parts between the isolated grounding moving contact 22 and the three-phase circuit breaker 1, and avoids the occurrence of "surface contact relying on the elastic compression mechanism" between the soft connection 23 and the isolated grounding moving contact 22 "Many shortcomings of this connection method can not only effectively reduce the mechanical impact on the primary electrical circuit when the isolated grounding moving contact 22 performs opening and closing actions, but also reduce the number of fault points, reduce the probability of failure, and improve The reliability and stability of the connection, the requirements for processing accuracy are also greatly reduced, and at the same time, the material cost and processing cost are saved, and the production efficiency is improved.

In summary, the embodiment of the utility model not only has a compact structure, saves the space occupied by the circuit breaker, isolating switch, and grounding switch in the switch cabinet, but also reduces the space between the circuit breaker and the isolating switch and the isolation between the moving contact and the isolation grounding switch. The connecting parts between the main shafts of the switch, thereby improving the safety, reliability and stability of the electrical connection between the three-position isolating grounding switch itself and the three-positioning isolating grounding switch and the circuit breaker, reducing the probability of failure and saving Reduce material cost and processing cost, improve production efficiency.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any person familiar with the technical field can easily think of All changes or replacements should fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (7)

1. a three-station isolating grounding switch and the cubicle switch equipment of chopper, for being connected in a major loop and earth-return circuit, it is characterized in that, including: three-phase breaker (1), three-station isolating grounding switch (2) and isolation earthing switch main shaft (4)；

Three-station isolating grounding switch (2) includes isolation earthing switch insulation shell (21), isolation ground connection moving contact (22), be flexible coupling (23), static contact isolation switch (24) and static contact of grounding switch (25)；The be flexible coupling top of (23) is welded on the bottom of isolation ground connection moving contact (22), thus constitutes one group of moving contact connecting structure for electrical equipment；Three groups of moving contact connecting structure for electrical equipment are fixed in side by side in isolation earthing switch insulation shell (21), and often in group moving contact connecting structure for electrical equipment, the top of isolation ground connection moving contact (22) is stretched out by the top of isolation earthing switch insulation shell (21), and the bottom of be flexible coupling (23) is stretched out by the bottom of isolation earthing switch insulation shell (21)；

The bottom of be flexible coupling (23) of three groups of moving contact connecting structure for electrical equipment respectively electrically connects with a chopper input terminal (13) of three-phase breaker (1), and each chopper input terminal (13) each be flexible coupling with (23) of three-phase breaker (1) electrically connects；

Isolation earthing switch main shaft (4) is fixed on the two ends of isolation earthing switch insulation shell (21), and drives isolation ground connection moving contact (22) of three groups of moving contact connecting structure for electrical equipment to carry out switching between static contact isolation switch (24), unsettled isolated bit and static contact of grounding switch (25).

Three-station isolating grounding switch the most according to claim 1 and the cubicle switch equipment of chopper, it is characterized in that, the bottom of be flexible coupling (23) is directly electrically connected with the chopper input terminal (13) of three-phase breaker (1) by conducting bolt (3).

Three-station isolating grounding switch the most according to claim 1 and 2 and the cubicle switch equipment of chopper, it is characterized in that, described isolation ground connection moving contact (22) includes plug-in strip folder (22a), studs (22b), clamp nut (22c) and holddown spring (22d)；

The bottom of plug-in strip folder (22a) welds together be flexible coupling (23), and the top of plug-in strip folder (22a) is for contacting with static contact isolation switch (11) and static contact of grounding switch (61)；

The top of plug-in strip folder (22a) includes two symmetrical blade of knife switch；Studs (22b) passes two symmetrical blade of knife switch, and studs (22b) be respectively arranged at the two ends with one group of clamp nut (22c) and holddown spring (22d), thus constitute the elastic hold-down mechanism of plug-in strip folder (22a).

Three-station isolating grounding switch the most according to claim 1 and 2 and the cubicle switch equipment of chopper, it is characterized in that, the two ends of be flexible coupling (23), be flexible coupling (23) are the most silver-plated or tin plating with the solder joint of isolation ground connection moving contact (22) and whole isolation ground connection moving contact (22).

Three-station isolating grounding switch the most according to claim 1 and 2 and the cubicle switch equipment of chopper, it is characterised in that described be flexible coupling (23) use bare copper wire or stannum copper litz wire to cold pressing and form.

Three-station isolating grounding switch the most according to claim 1 and 2 and the cubicle switch equipment of chopper, it is characterized in that, static contact isolation switch (24) directly electrically connects with the bus in a major loop or the conductor in sleeve pipe, and static contact of grounding switch (25) directly electrically connects with the earth bus in earth-return circuit.

Three-station isolating grounding switch the most according to claim 1 and 2 and the cubicle switch equipment of chopper, it is characterized in that, described isolation earthing switch insulation shell (21) includes three moving contact housings (21a) and two reels (21b)；

Often group moving contact connecting structure for electrical equipment is fixed in different moving contact housings (21a), and often in group moving contact connecting structure for electrical equipment, the top of isolation ground connection moving contact (22) is stretched out by the top of moving contact housing (21a), and the bottom of be flexible coupling (23) is stretched out by the bottom of moving contact housing (21a)；

The two ends, left and right of each moving contact housing (21a) are equipped with union joint (21c)；Three moving contact housings (21a) are chained together by union joint (21c), and the moving contact housing (21a) of high order end is connected fixing by the union joint (21c) of its left end with a reel (21b), and the moving contact housing (21a) of low order end is connected fixing by the union joint (21c) of its right-hand member with another reel (21b)；

Isolation earthing switch main shaft (4) includes two sections, and the outside with two reels (21b) is coaxially fixedly mounted with respectively.