CN116705546A - Contact structure with built-in permanent magnet array and application of GIS fast disconnecting switch - Google Patents

Abstract

A contact structure with built-in permanent magnet array and GIS quick isolating switch of application, this contact structure includes a pair of annular permanent magnet integrated configuration that is set up under the shield cover and locates at the inside movable guide rod permanent magnet structure of the movable end contact conducting rod; the permanent magnet in the annular permanent magnet combination structure can be a combination of a plurality of permanent magnets or an integral annular permanent magnet; the polarities of the permanent magnets in the annular permanent magnet combination structure can be kept consistent, alternately distributed or symmetrically distributed; the permanent magnet structure of the movable guide rod is cylindrical or rectangular, and the end face of the strong magnetic field faces the inside of the movable contact and the fixed contact respectively; after the annular permanent magnet combination structure under the shielding cover is matched with the movable guide rod permanent magnet structure inside the movable end contact conducting rod, a magnetic field is generated in a gap area of the isolating switch contact, and current is switched on and off under the action of the magnetic field; the invention solves the problem that the environment-friendly gas is used to replace SF ₆ In the case of gasesThe problem of insufficient small current breaking capacity of the traditional GIS rapid isolation switch structure.

Description

Contact structure with built-in permanent magnet array and application of GIS fast isolating switch

technical field

The invention belongs to the field of high-voltage GIS, and in particular relates to a contact structure with a built-in permanent magnet array and an applied GIS fast isolating switch.

Background technique

The traditional GIS isolation switch uses SF ₆ gas as an arc extinguishing and insulating medium. SF ₆ gas has good electrical properties, but due to the strong greenhouse effect of SF ₆ , it is not conducive to the achievement of the "double carbon" goal. In recent years, many countries have The emission of SF ₆ is limited. Therefore, the use of environmentally friendly gases to replace SF ₆ in GIS has become a research hotspot at present, but the breaking capacity of many existing environmentally friendly alternative gases is significantly worse than that of SF ₆ . Under the condition of environment-friendly alternative gas, the structure of the traditional GIS fast isolating switch can no longer meet the requirement of breaking small current. In order to improve the ability of environmental-friendly GIS to break small currents, it is necessary to improve and optimize the contact structure of GIS.

At present, the control of the arc is mainly realized by applying a transverse magnetic field or a longitudinal magnetic field. The transverse magnetic field is mainly applied by adopting a transverse magnetic field contact structure, and the transverse magnetic field contact structure includes a spiral groove contact structure, a swivel-shaped contact structure and a cup-shaped transverse magnetic contact structure. During the breaking process of the transverse magnetic field contact structure, due to the current path, a transverse magnetic field perpendicular to the arc column current will be generated, and the magnetic field will drive the arc to move on the contact surface. The transverse magnetic contact has the advantages of simple structure and superior electrical conductivity, but the surface of the contact will be deformed by arc ablation, and in severe cases, a welding short circuit will occur between the slots, which greatly reduces the magnetic field effect. The longitudinal magnetic field is mainly applied by adopting a longitudinal magnetic field contact structure, and the longitudinal magnetic field contact structure includes a cup-shaped longitudinal magnetic contact structure, a horseshoe-shaped longitudinal magnetic contact structure, and a quadrupole longitudinal magnetic contact structure. Under the action of the longitudinal magnetic field, the arc will maintain a diffuse form, and the arc spots are evenly distributed on the electrode surface, thereby reducing the ablation of the contacts, which is conducive to the recovery of the dielectric strength after the arc and the improvement of the breaking capacity. However, the structure of the longitudinal magnetic field contact has the disadvantages of complex structure and difficult fabrication.

Regarding the structure of the GIS isolating switch, first of all, due to the existence of structures such as fingers, it is impossible to use a longitudinal magnetic field contact with a complex structure. Secondly, the GIS isolating switch needs to break a large current. Ablation is easy to occur, resulting in damage or failure of the transverse magnetic field contact. Therefore, the scheme of applying a magnetic field using a magnetic field contact structure is not suitable for GIS isolating switches.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the purpose of the present invention is to provide a contact structure with a built-in permanent magnet array and a GIS fast isolating switch for its application, which solves the problem of breaking small currents with the traditional environment-friendly GIS isolating switch structure. The problem of insufficient capacity.

To achieve the above object, the present invention adopts the following technical solutions:

A contact structure with a built-in permanent magnet array, including a moving end contact structure 201 and a static end contact structure 202, the end of the moving end contact structure 201 is a moving end contact shield 107; One end of the contact shield 107 is fixed with a moving end conductor structure 101; inside the moving end conductor structure 101 is fixed a moving end conductive rod guiding support structure 104; the moving end conductive rod guiding supporting structure 104 is adjacent to the moving end contact The end of the shielding cover 107 is fixed with a moving end plum blossom contact finger 108; the inner space formed by the moving end contact shield 107, the moving end conductive rod guiding support structure 104 and the moving end plum blossom contact finger 108 is fixed with a moving end ring. The permanent magnet support structure 105; the ring-shaped permanent magnet support structure 105 of the movable end is slotted inside, and the permanent magnet array 106 of the movable end is fixed; Slidingly connected moving end contact conductive rod 102; the moving end contact conductive rod 102 is fixed with a moving guide rod permanent magnet structure 103 inside; the moving end contact conductive rod 102 forms a dynamic guide rod permanent magnet structure 103 Fully covered to prevent arc ablation;

The end of the static end contact structure 202 is a static end contact shield 111; a static end conductor structure 116 is fixed at one end of the static end contact shield 111; a static end conductor structure 116 is fixed inside the static end conductor structure 116. The end conductive rod guide support structure 115; the end of the static end conductive rod guide support structure 115 is fixed with the static end plum blossom contact finger 112; the static end plum blossom contact finger 112 has a conductive rod 102 for the movable end contact when the contact is closed. cavity; in the internal space formed by the static end contact shield 111, the static end conductive rod guide support structure 115 and the static end plum blossom contact finger 112, a static end annular permanent magnet support structure 114 is fixed; the static end annular The permanent magnet support structure 114 is internally slotted, and the static end permanent magnet array 113 is fixed thereon;

The static end permanent magnet array 113, the moving end permanent magnet array 106 and the moving guide rod permanent magnet structure 103 inside the moving end contact conductive rod 102 cooperate together to generate a composite magnetic field in the contact gap area, and the composite magnetic field acts on the opening. The arc generated during the breaking process improves the breaking capacity under the condition of small current.

The moving end permanent magnet array 106 is a combination of multiple permanent magnets or an integral ring permanent magnet; the stationary end permanent magnet array 113 is a combination of multiple permanent magnets or an integral ring permanent magnet.

When the moving end permanent magnet array 106 and the static end permanent magnet array 113 are a combination of a plurality of permanent magnets, the S pole and the N pole of the permanent magnet in the static end permanent magnet array 113 remain consistent, when the number of permanent magnets When it is an even number, the polarity of the permanent magnets is distributed or symmetrically distributed between phases, and the S poles and N poles of the permanent magnets in the permanent magnet array 106 at the moving end are also consistent. When the number of permanent magnets is an even number, the polarities of the permanent magnets are interphase Distribution or symmetrical distribution; the permanent magnets of the permanent magnet array 106 at the moving end and the permanent magnets of the permanent magnet array 113 at the static end are placed oppositely with the same polarity or with different polarities;

When the moving end permanent magnet array 106 and the static end permanent magnet array 113 are an integral annular permanent magnet, the permanent magnets of the moving end permanent magnet array 106 and the permanent magnets of the static end permanent magnet array 113 are oppositely placed with the same polarity or Different polarities are placed opposite to each other.

The permanent magnet structure 103 of the moving guide rod is cylindrical or rectangular, and the end faces of its strong magnetic field are respectively facing the inside of the moving contact and the static contact; The material is insulating non-magnetic material.

The number of permanent magnets in the permanent magnet array at the moving end 106 and the permanent magnet array at the stationary end 113 is consistent, ranging from 2 to 30.

The central axes of the permanent magnets of the moving end permanent magnet array 106 and the static end permanent magnet array 113 respectively maintain a preset angle with the central axis of the moving end plum blossom contact finger 108 and the static end plum blossom contact finger 112. The angle is 0-75°.

The permanent magnet array 106 at the moving end and the permanent magnet array 113 at the stationary end remain stationary during the switching operation, and the permanent permanent magnet structure 103 inside the conductive rod 102 of the moving end contact moves together with the conductive rod during the switching operation.

A GIS fast isolating switch, comprising the contact structure with a built-in permanent magnet array.

Compared with prior art, the present invention has following advantage:

1) According to the structural characteristics of the GIS isolating switch, a contact structure with a built-in permanent magnet array that meets the structural requirements is proposed, and the space under the metal shield of the GIS isolating switch is skillfully used to cooperate with the permanent magnet array, and the use of The internal space of the conductive rod of the moving contact is embedded with a permanent magnet structure to realize the application of a magnetic field in the contact gap area of the isolating switch and improve the control of the arc.

2) The breaking capacity of the environment-friendly GIS isolating switch in the case of breaking small currents is improved. Through the contact structure of the built-in permanent magnet array in the present invention, the use of a magnetic field to control the arc is realized, and the breaking capacity of the environmentally friendly GIS isolating switch is improved under the condition of small current, which is a good solution to the environmental protection of the GIS isolating switch. The problem of insufficient breaking capacity of the traditional structure of the small current.

3) The present invention realizes the application of the composite magnetic field by using the permanent magnet array. Under the joint action of the permanent magnets in the present invention, the composite action of the transverse magnetic field and the longitudinal magnetic field is realized in the contact gap area of the isolating switch, and the control action of the magnetic field on the arc is improved. On the premise of not destroying the electric field intensity distribution in the gap area of the isolating switch contacts, the small current breaking capacity of the contacts is improved.

4) The present invention has a simple structure, can be assembled and used conveniently, can promote the wide application of environment-friendly GIS isolating switches, reduce the use of greenhouse gases, help protect the environment, and promote the realization of the "double carbon" strategic goal.

Description of drawings

Fig. 1 is an axial sectional view of the contact structure of the built-in permanent magnet array of the present invention.

Fig. 2 a is the left side of the contact structure (removing the moving side shield structure 107, the moving side conductor structure 101, the static side shield structure 111, and the static side conductor structure 116) of the permanent magnet array of assembling a plurality of permanent magnets of the present invention face view.

Fig. 2 b is the right side of the contact structure (removing the moving side shield structure 107, the moving side conductor structure 101, the static side shield structure 111, and the static side conductor structure 116) of the permanent magnet array of assembling a plurality of permanent magnets of the present invention face view.

Fig. 3 a is the contact structure of the permanent magnet array (removing moving side shield structure 107, moving side conductor structure 101, static side shielding structure 111, static side conductor structure 116) of the permanent magnet array of assembling an integral annular permanent magnet of the present invention Left side view.

Fig. 3 b is respectively the contact structure of the permanent magnet array of assembling an integral annular permanent magnet of the present invention (remove the moving side shield structure 107, the moving side conductor structure 101, the static side shield structure 111, the static side conductor structure 116) right side view of .

Fig. 4 is respectively the partial magnetic pole combination schematic diagram of two groups of permanent magnet arrays of moving end and the permanent magnet structure of moving guide rod in the contact structure when assembling a plurality of permanent magnets of the present invention, wherein: Fig. 4 a is the permanent magnet array of moving end and static The N poles of the permanent magnets in the end permanent magnet array are opposite to the N poles. Figure 4b shows that the S poles are opposite to the N poles. Figure 4c shows that the S poles are opposite to the S poles. Figure 4d shows that the N poles are opposite to the S poles. The polarities of the permanent magnets of the permanent magnet array are distributed alternately, and 4f is the symmetrical distribution of the polarities of the permanent magnets of the permanent magnet array at the moving end.

Fig. 5 is a schematic diagram of part magnetic pole combination of two groups of permanent magnet arrays at the dynamic and static ends and a part of the permanent magnet structure of the moving guide rod in the contact structure when assembling an integral annular permanent magnet of the present invention, wherein: Fig. 5 a The annular permanent magnet at the dynamic and static end The N pole and the S pole are opposite. Figure 5b shows that the N pole and the N pole of the ring permanent magnet at the dynamic and static ends are opposite. Opposite to the N pole.

Fig. 6a is a schematic diagram of the structure of the moving side contact in the permanent magnet array contact structure equipped with a plurality of permanent magnets according to the present invention.

Fig. 6b is a schematic diagram of the structure of the static side contact in the permanent magnet array contact structure equipped with a plurality of permanent magnets according to the present invention.

Fig. 7 is a schematic plan view when the contacts of the GIS quick isolating switch using the contact structure of the built-in permanent magnet array of the present invention are separated.

Fig. 8 is a schematic plan view of the contact of the GIS quick isolating switch applying the contact structure of the built-in permanent magnet array of the present invention when the contacts are closed.

Detailed ways

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

Fig. 1 is an axial sectional view of a contact structure with a built-in permanent magnet array according to the present invention. As shown in FIG. 1 , a contact structure with a built-in permanent magnet array includes a moving end contact structure 201 and a stationary end contact structure 202 . In the moving end contact structure 201, the moving side annular permanent magnet support structure 105 is welded to the base of the moving end conductive rod guiding support structure 104, and the moving end plum blossom contact finger 108 is welded to the end of the moving end conductive rod guiding supporting structure 104; The rod guide support structure 104 and the moving end contact shield 107 are welded on the moving side conductor structure 101; the moving end surrounding permanent magnet structure is placed under the moving end contact shield 107 of the moving end contact structure 201 but does not touch, And surround the moving end plum blossom contact finger structure 108 but do not touch, the moving end surrounding permanent magnet structure includes a moving side annular permanent magnet support structure 105 with internal slots and a moving end permanent magnet array 106 placed in the slot; The permanent magnet structure 103 of the movable guide rod is placed in the cavity of the conductive rod 102 of the movable end contact, and closely fits with the conductive rod 102 of the movable end contact to form a complete covering to prevent arc ablation. In the static end contact structure 202, the static side annular permanent magnet support structure 114 is welded to the base of the static end conductive support structure 115, and the static end plum blossom contact structure 112 is welded to the end of the static end conductive support structure 115; the static end conductive support structure 115 The static end contact shield 111 is welded on the static side conductor structure 116; the static end surrounding permanent magnet structure is placed at the lower part of the static end contact shield 111 of the static end contact structure 202 but does not touch, and surrounds the static end plum blossom contact Around the finger structure 112 but not in contact, the static end surrounding permanent magnet structure of the static end contact structure 201 is consistent with the moving end surrounding permanent magnet structure in the moving end contact structure 201, including the static end with a notch An annular permanent magnet support structure 114 and a stationary permanent magnet array 113 placed in the slot. The material of the ring-shaped permanent magnet support structure 105 on the moving side is an insulating and non-magnetic material, such as a high-temperature-resistant plastic material (PPA, PA46, etc.), acrylic material, etc., which can withstand the high-temperature environment generated when the GIS isolating switch operates, and has Good insulation performance can isolate the influence of the electric field in the working environment, and it is a non-magnetic material, which has no effect on the magnetic field generated by the permanent magnet array. The permanent magnet array 106 at the moving end can be a combination of multiple permanent magnets or an integral ring-shaped permanent magnet; the permanent magnet structure 103 of the moving guide rod is cylindrical or rectangular, and its strong magnetic field end faces are respectively facing the inside of the moving contact and the static contact; The material of the ring-shaped permanent magnet support structure 114 on the static side is an insulating and non-magnetic material, such as a high-temperature-resistant plastic material (PPA, PA46, etc.), acrylic material, etc., and this type of material can withstand the high-temperature environment generated when the GIS isolating switch operates. Good insulation performance can isolate the influence of the electric field in the working environment, and it is a non-magnetic material, which has no effect on the magnetic field generated by the permanent magnet array. The permanent magnet array 113 at the static end can be a combination of multiple permanent magnets or an integral annular permanent magnet. During the breaking process, the arc is generated in the gap between the upper surface of the conductive rod 102 of the moving end contact and the plum blossom contact finger 112 at the static end. Firstly, the magnetic field generated by the permanent magnet structure 103 in the moving end contact conductive rod 102 plays a major role, preventing the arc from entering the aggregation state to ablate the contact and other structures. With the movement of the moving end contact conductive rod 102 , the arc enters the contact gap area of the isolating switch, and is affected by the compound magnetic field generated by the permanent magnet array 113 at the static end, the permanent magnet array 106 at the moving end and the permanent magnet structure 103 of the moving guide rod, and the arc stretches and moves, which leads to The increase of the arc voltage realizes breaking. This method reduces the ablation degree of the arc on the contacts, and improves the breaking ability of the GIS under the condition of small current.

Fig. 2 a and Fig. 2 b are respectively the contact structure of the permanent magnet array of assembling a plurality of permanent magnets of the present invention (remove moving side shield structure 107, moving side conductor structure 101, static side shield structure 111, static side conductor structure 116 ) left side view and right side view. The number of permanent magnets in the permanent magnet array 103 at the moving end and the permanent magnet array at the stationary end 113 is kept the same, being 2-30, and the ring-shaped permanent magnet support structure 105 on the moving side and the annular permanent magnet support structure 114 on the stationary side are evenly distributed along the circumference. distributed.

Fig. 3 a and Fig. 3 b are respectively the contact structure of the permanent magnet array of assembling an integral annular permanent magnet of the present invention (remove moving side shield structure 107, moving side conductor structure 101, static side shield structure 111, static side conductor Left and right side views of structure 116). The structure shown in Figure 3a and Figure 3b is basically the same as the contact structure of the permanent magnet array equipped with multiple permanent magnets, but the slotted openings of the ring permanent magnet support structure 105 on the moving side and the ring permanent magnet support structure 114 on the static side are from A plurality of circular notches are changed into a whole annular notch for fixing a whole ring permanent magnet.

Fig. 4 is a schematic diagram of partial magnetic pole combinations of two groups of permanent magnet arrays at the moving and stationary ends and the permanent magnet structure of the moving guide rod in the contact structure when a plurality of permanent magnets are assembled according to the present invention. The permanent magnet structure 103 of the moving guide rod can have two kinds of magnetism, that is, the end face of the strong magnetic field facing the inside of the moving contact can be N pole or S pole, and the end face of the strong magnetic field facing the static contact is opposite to it; the permanent magnet array 106 and The permanent magnets in the static end permanent magnet array 113 can be N poles and N poles (Figure 4a), S poles and N poles (Figure 4b), S poles and S poles (Figure 4c) or N poles and S poles Relative (Fig. 4d); meanwhile, when the number of permanent magnets in the permanent magnet array 106 at the moving end and the permanent magnet array at the stationary end 113 is an even number, the polarity of the permanent magnets can be distributed alternately or symmetrically, as shown in Fig. 4e and Fig. 4f The phase-to-phase distribution and symmetrical distribution of the permanent magnet polarity of the permanent magnet array 106 at the moving end are shown respectively. In the case of the phase-to-phase distribution, the action direction of the composite magnetic field generated by the permanent magnet array at the moving end 106 and the permanent magnet array at the stationary end 113 is mainly Horizontal, so that the arc moves toward the edge of the contact, so that the shape of the arc is stretched and deformed; in the case of symmetrical distribution, the direction of action of the composite magnetic field generated by the permanent magnet array 106 at the moving end and the permanent magnet array 113 at the stationary end is transverse and longitudinal Coexistence, the main function is longitudinal, to a greater extent reduce the ablation of the arc on the contacts.

Fig. 5 is a schematic diagram of partial magnetic pole combinations of two groups of permanent magnet arrays at the moving and stationary ends and the permanent magnet structure of the moving guide rod in the contact structure when an integral annular permanent magnet is assembled according to the present invention. The permanent magnet structure 103 of the moving guide rod can have two kinds of magnetism, that is, the end face of the strong magnetic field facing the inside of the moving contact can be N pole or S pole, and the end face of the strong magnetic field facing the static contact is opposite to it; the permanent magnet array 106 and The permanent magnets in the static end permanent magnet array 113 can be N poles and S poles opposite (Figure 5a), N poles and N poles (Figure 5b), S poles and S poles (Figure 5c) or S poles and N poles Relative (Fig. 5d).

Fig. 6a and Fig. 6b are schematic diagrams of the permanent magnet combination of the moving end contact structure 201 and the stationary end contact structure 202 in the contact structure with built-in permanent magnet array of the present invention, respectively. As shown in FIG. 6 a , the moving permanent magnet assembly includes a moving ring permanent magnet support structure 105 , a moving permanent magnet array 106 and a moving guide rod permanent magnet structure 103 placed inside the moving contact conductive rod 102 . As shown in FIG. 6 b , the stationary permanent magnet assembly includes a stationary annular permanent magnet support structure 114 and a stationary permanent magnet array 113 . The central axes of the permanent magnets of the permanent magnet array 106 at the moving end and the permanent magnet array at the stationary end 113 respectively maintain a certain preset angle α with the central axes of the plum blossom contact fingers 108 at the moving end and the plum blossom contact fingers 112 at the static end. The angle ranges from 0° to 75°, and within this angle range, the magnetic fields generated by the permanent magnet array 106 at the moving end and the permanent magnet array 113 at the stationary end can act on the arc generated during the switching process to the greatest extent.

Fig. 7 is a schematic plan view of the contact separation of the GIS quick isolating switch using the contact structure of the built-in permanent magnet array of the present invention. The permanent magnet array 106 at the moving end and the permanent magnet array 113 at the stationary end used in the structure of this figure are combinations of multiple permanent magnets. As shown in FIG. 7 , the pot insulator 122 at the moving end and the pot insulator 125 at the static end of the GIS quick disconnect switch are respectively connected to two ends of the outer casing 123 . The center of the movable end pot insulator 122 is connected with the middle conductor structure 121 of the movable end insulator, the movable end conductor structure 101 is welded to the middle conductor structure 121 of the movable end insulator, and the movable end conductive rod guide support structure 104 is connected to the movable end conductor structure 101 , the moving end contact conductive rod 102 passes through the center of the driven end conductor structure 101 and the moving end conductive rod guiding support structure 104 . The ring-shaped permanent magnet support structure 105 at the moving end is connected to the guiding support structure 104 of the conductive rod at the moving end, and surrounds the conductive rod 102 of the moving end contact and the plum blossom contact finger 108 at the moving end, but does not touch. The permanent magnet array 106 at the moving end is evenly placed in the annular permanent magnet support structure 105 at the moving end. The permanent magnet structure 103 of the movable guide rod is placed in the cavity of the conductive rod 102 of the movable end contact, and is closely attached to the conductive rod 102 of the movable end contact. The moving end contact shield 107 is connected to the moving end conductor structure 101 , and the central axis coincides with the central axis of the moving end plum blossom contact finger 108 . The center of the static end pot insulator 125 is connected with the middle conductor structure 124 of the static end insulator, the static end conductor structure 116 is welded to the middle conductor structure 124 of the static end insulator, and the static end conductive rod guide support structure 115 is connected to the static end conductor structure 116 , the plum blossom contact finger 112 at the static end is connected to the guiding support structure 115 of the conductive rod at the static end. The ring-shaped permanent magnet support structure 114 at the static end is connected to the conductive rod guide support structure 115 at the static end, and surrounds the plum blossom contact finger 112 at the static end, but does not touch. The static end permanent magnet array 113 is evenly placed in the static end annular permanent magnet support structure 114 , and the static end contact shield 111 is connected to the static end conductor structure 116 .

Fig. 8 is a schematic plan view of the contact of the GIS quick isolating switch applying the contact structure of the built-in permanent magnet array of the present invention when the contacts are closed. The basic structure is consistent with that described in Figure 7, the difference is that the contacts of the GIS quick disconnect switch in Figure 8 have been closed. The conductive rod 102 of the movable end moves forward, is inserted into the cavity of the plum blossom contact finger 112 at the static end, and closely fits with the plum blossom contact finger 112 at the static end and the guiding support structure 115 of the conductive rod at the static end. The permanent magnet structure 103 of the moving guide rod moves together with the conductive rod 102 of the moving end contact.

The present invention is not limited to the above-mentioned preferred embodiments, those skilled in the art can understand a new type of contact structure with a built-in permanent magnet array of the present invention and a GIS quick disconnect switch and related GIS quick disconnect switches according to the teaching of the present invention Make modifications and changes. All these modifications and changes should fall within the protection scope of the present invention.

Claims (9)

1. A contact structure with a built-in permanent magnet array, comprising a moving end contact structure (201) and a static end contact structure (202), characterized in that: The end of the moving end contact structure (201) is a moving end contact shield (107); a moving end conductor structure (101) is fixed at one end of the moving end contact shield (107); the moving end The conductive rod guide support structure (104) of the movable end is fixed inside the conductor structure (101); the plum blossom of the movable end is fixed at the end of the conductive rod guide support structure (104) adjacent to the movable end contact shield (107). Contact finger (108); the inner space formed by the moving end contact shield (107), the moving end conductive rod guide support structure (104) and the moving end plum blossom contact finger (108) is fixed with a moving end annular permanent magnet support structure (105); the ring-shaped permanent magnet support structure (105) at the moving end is internally slotted, and the permanent magnet array (106) at the moving end is fixed; The movable end conductive rod guide support structure (104) and the movable end plum blossom contact finger (108) are arranged with a slidingly connected movable end contact conductive rod (102); inside the movable end contact conductive rod (102) A moving guide rod permanent magnet structure (103) is fixedly installed; the moving end contact conductive rod (102) forms a complete coating on the moving guide rod permanent magnet structure (103), preventing arc ablation; The end of the static end contact structure (202) is a static end contact shield (111); a static end conductor structure (116) is fixed at one end of the static end contact shield (111); the static end The interior of the conductor structure (116) is fixed with a static end conductive rod guiding support structure (115); the end of the static end conductive rod guiding support structure (115) is fixed with a static end plum blossom contact finger (112); the static end plum blossom contact The inside of the finger (112) has a cavity for accommodating the conductive rod (102) of the movable end contact when the contact is closed; the conductive rod guide support structure (115) and the static end contact shield (111) and the static end contact The internal space formed by the quincunx contact fingers (112) is fixed with a static-end annular permanent magnet support structure (114); the static-end annular permanent magnet support structure (114) is internally slotted and fixed with a static-end permanent magnet array (113); The static end permanent magnet array (113), the moving end permanent magnet array (106) and the moving guide rod permanent magnet structure (103) inside the moving end contact conductive rod (102) cooperate together to produce a composite in the contact gap area. Magnetic field, the composite magnetic field acts on the arc generated during the breaking process, improving the breaking capacity under the condition of small current. 2. A contact structure with a built-in permanent magnet array according to claim 1, characterized in that: the moving end permanent magnet array (106) is a combination of a plurality of permanent magnets or an integral annular permanent magnet; The static end permanent magnet array (113) is a combination of multiple permanent magnets or an integral ring permanent magnet. 3. A contact structure with a built-in permanent magnet array according to claim 2, characterized in that: when the moving end permanent magnet array (106) and the static end permanent magnet array (113) are a plurality of permanent magnets In the case of combination, the S poles and N poles of the permanent magnets in the permanent magnet array (113) at the static end are consistent, and when the number of permanent magnets is an even number, the polarity of the permanent magnets is distributed between phases or symmetrically, and the permanent magnets at the moving end The S pole and the N pole of the permanent magnet in the array (106) are also kept consistent, and when the number of permanent magnets is an even number, the polarity of the permanent magnets is distributed between phases or symmetrically distributed; the permanent magnets and The permanent magnets of the static end permanent magnet array (113) are placed oppositely with the same polarity or with different polarities; When the moving end permanent magnet array (106) and the static end permanent magnet array (113) are an integral annular permanent magnet, the permanent magnet of the moving end permanent magnet array (106) and the static end permanent magnet array (113) The permanent magnets are placed opposite to each other with the same polarity or different polarities. 4. A contact structure with a built-in permanent magnet array according to claim 1, characterized in that: the permanent magnet structure (103) of the moving guide rod is cylindrical or rectangular, and the end faces of the strong magnetic field are respectively facing the moving contact Head interior and static contacts. 5. A contact structure with a built-in permanent magnet array according to claim 1, characterized in that: the material of the moving side annular permanent magnet support structure (105) and the static side annular permanent magnet support structure (114) It is an insulating non-magnetic material. 6. A contact structure with a built-in permanent magnet array according to claim 1, characterized in that: the number of permanent magnets in the moving end permanent magnet array (106) and the static end permanent magnet array (113) remains Consistent, 2-30. 7. A contact structure with a built-in permanent magnet array according to claim 1, characterized in that: the central axis of the permanent magnets of the moving end permanent magnet array (106) and the static end permanent magnet array (113) The preset included angles are respectively maintained with the central axes of the movable-end plum-blossom contact fingers (108) and the static-end plum-blossom contact fingers (112), and the preset included angles are 0-75°. 8. A contact structure with a built-in permanent magnet array according to claim 1, characterized in that: the moving end permanent magnet array (106) and the static end permanent magnet array (113) remain stationary during the switching operation , the movable guide rod permanent magnet structure (103) inside the movable end contact conductive rod (102) moves together with the conductive rod during the switching action. 9. A GIS quick isolating switch, characterized in that the GIS quick isolating switch comprises the contact structure with a built-in permanent magnet array according to any one of claims 1 to 8.