Opening and closing resistor and isolation grounding switch with opening and closing resistor

Abstract

The utility model relates to the technical field of switch equipment, in particular to an opening and closing resistor and an isolation grounding switch with the opening and closing resistor. The opening and closing resistor comprises a resistor, a first shielding case and a second shielding case, the first shielding case and the second shielding case are connected to the two ends of the resistor, the two shielding cases are fixedly supported through an insulation supporting rod, the first shielding case is used for being conducted with an isolation static end, and the opening and closing resistor further comprises a resistor leading-in conductor which is conducted with the second shielding case. The resistance lead-in conductor is provided with a through hole for the isolation moving contact to movably pass through, the aperture of the through hole is larger than the outer diameter of the isolation moving contact, and an air gap is formed between the through hole and the isolation moving contact when the isolation moving contact passes through the through hole. The resistance introduction conductor is not in contact with the isolation moving contact, so that resistance is not caused to the action of the isolation moving contact in the opening and closing process, and the opening and closing speed is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a switchgear technical field especially relates to a kind of opening and closing resistance and the isolation grounding switch with opening and closing resistance. BACKGROUND

[0002] When the isolating switch in GIS closes and breaks off the no-load short bus, due to the slow movement speed of the isolating switch, multiple reignition occurs in the breaking process, and the voltage at both ends of the contact gap suddenly rises or drops within several nanoseconds. The traveling wave generated by the voltage steep wave propagates in GIS, and the superimposed components of multiple folded and reflected traveling waves form VFTO. Currently, the amplitude and steepness of VFTO are limited by connecting the opening and closing resistance in parallel to the isolating switch gap in the ultra-high voltage system. The contact device for suppressing high-voltage isolating switch transient overvoltage disclosed in the Chinese patent with the authorization announcement No. CN101154530B integrates the opening and closing resistance in the static end of the isolating switch. The opening and closing resistance includes a resistor and a resistance contact. Shielding covers are arranged at both ends of the resistor. The shielding cover at one end is in conduction with the resistance contact, and the shielding cover at the other end is in conduction with the isolation static end. The two shielding covers are fixed and supported and insulated by an insulating support rod. The resistance contact is between the isolation static end and the isolation moving end. During the closing process of the isolating switch, the resistance contact breaks down before the isolation static end and the moving main contact. The current forms a loop through the opening and closing resistance at the moment of breakdown, effectively reduces the energy of the breakdown voltage, and plays a role in suppressing the transient overvoltage. During the opening process of the isolating switch, the moving main contact is separated from the static main contact first. Before the moving main contact is separated from the resistance contact, the potential difference is zero. When the moving main contact is separated from the resistance contact, breakdown occurs between the moving main contact and the resistance contact. The current forms a loop through the opening and closing resistance at the moment of breakdown, effectively reduces the energy of the breakdown voltage, and plays a role in suppressing the transient overvoltage.

[0003] The resistance contact of the opening and closing resistance of the existing contact device has six finger pieces, which are fixed on the contact seat by a coil spring. The resistance contact and the moving main contact are connected in a contact mode. During the closing process of the isolating switch, the moving main contact needs to overcome the force of the coil spring to be pressed into the contact seat and the finger pieces to be in contact and conduction. During the opening process, the finger pieces of the resistance contact are always in contact and friction with the moving main contact to generate friction resistance before the moving main contact is separated from the resistance contact. Therefore, the structure of the existing opening and closing resistance causes resistance to the opening and closing movement of the moving main contact, affecting the opening and closing speed. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an opening and closing resistance to solve the problem that the structure of the existing opening and closing resistance causes resistance to the opening and closing movement of the moving main contact, affecting the opening and closing speed. The utility model also aims at providing an isolation grounding switch with opening and closing resistance to solve the problem that the structure of the opening and closing resistance of the existing isolating switch causes resistance to the opening and closing movement of the moving main contact, affecting the opening and closing speed.

[0005] The utility model discloses a closing and opening resistance adopts the following technical scheme:

[0006] A kind of closing and opening resistance, including resistor and first, second shield cover connected at resistor both ends, fixed support is realized between two shield covers by insulating strut, wherein first shield cover is used to be communicated with isolated static end, further including resistance lead-in conductor, resistance lead-in conductor is communicated with second shield cover, resistance lead-in conductor has the perforation for isolated moving contact to move through, and the aperture of perforation is greater than the outer diameter of isolated moving contact and forms air gap between isolated moving contact when isolated moving contact passes through.

[0007] Further, the central position of the second shield cover is provided with a sunken platform, and the resistance lead-in conductor is arranged at the sunken platform.

[0008] Further, the resistance lead-in conductor is a continuous bending thin-walled structure, and the resistance lead-in conductor is lapped on the sunken platform by the folded edge of one end and is fixedly connected with the sunken platform.

[0009] Further, the side of the second shield cover facing the first shield cover is provided with a third shield cover, the third shield cover is fixedly connected with the second shield cover and is communicated.

[0010] Further, the third shield cover, the second shield cover and the resistance lead-in conductor are fixedly connected by the same fastener.

[0011] Further, the first shield cover includes a support part and a cover part, the support part is used to be supported between the static end inlet and outlet line basin and the isolated static end and is communicated with the isolated static end, and the cover part is outside the support part.

[0012] Further, the support part is integrated with a grounding static contact.

[0013] Further, the insulating strut is provided with two or more and is uniformly distributed on the same circumference.

[0014] Further, the resistor is provided with two or more and is on the same circumference with the insulating strut, and at least one resistor is on the two sides of the same insulating strut with other resistors.

[0015] Beneficial effects: the utility model discloses an improved invention. The shielding cover of one end of the opening and closing resistance is used for being in conduction with the isolated static end, the shielding cover of the other end is in conduction with the resistance lead-in conductor, the resistance lead-in conductor is between the isolated static end and the isolated dynamic end, the resistance lead-in conductor breaks down before the isolated static end and the isolated dynamic contact in the closing process of the isolating switch, the opening and closing resistance is automatically connected, and the suppression of VFTO is realized. In the opening process of the isolating switch, the resistance lead-in conductor breaks down with the isolated dynamic contact with the increase of the distance between the isolated dynamic contact and the isolated static end, the opening and closing resistance is automatically connected, and the suppression of VFTO is realized. The perforation aperture of the resistance lead-in conductor is greater than the outer diameter of the isolated dynamic contact, so that the air gap is formed between the resistance lead-in conductor and the isolated dynamic contact when the isolated dynamic contact passes, the resistance lead-in conductor does not contact the isolated dynamic contact, and therefore the resistance of the isolated dynamic contact is not caused in the opening and closing process, and the opening and closing speed is improved.

[0016] The isolating grounding switch with opening and closing resistance of the utility model adopts the following technical scheme:

[0017] The isolating grounding switch with opening and closing resistance includes an isolated dynamic contact and an isolated static end, the isolated static end is integrated with opening and closing resistance, the opening and closing resistance includes a resistor and first and second shielding covers connected at both ends of the resistor, the two shielding covers are fixed and supported through an insulating support rod, the first shielding cover is in conduction with the isolated static end, and the isolating grounding switch further includes a resistance lead-in conductor, the resistance lead-in conductor is in conduction with the second shielding cover, the resistance lead-in conductor has a perforation for the isolated dynamic contact to pass through, and the perforation aperture is greater than the outer diameter of the isolated dynamic contact to form an air gap between the resistance lead-in conductor and the isolated dynamic contact when the isolated dynamic contact passes.

[0018] Further, a sunken platform is arranged at the center of the second shielding cover, and the resistance lead-in conductor is arranged at the sunken platform.

[0019] Further, the resistance lead-in conductor is a thin-walled structure with continuous bending, and the resistance lead-in conductor is lapped on the sunken platform through the bent edge at one end and is fixedly connected with the sunken platform.

[0020] Further, a third shielding cover is arranged on the side of the second shielding cover facing the first shielding cover, and the third shielding cover is fixedly connected with the second shielding cover and is in conduction.

[0021] Further, the third shielding cover, the second shielding cover and the resistance lead-in conductor are fixedly connected through the same fastener.

[0022] Further, the first shielding cover includes a support part and a cover part, the support part is used for being supported between the static end inlet and outlet line basin and the isolated static end and is in conduction with the isolated static end, and the cover part is located at the outer side of the support part.

[0023] Further, a grounding static contact is integrated on the support part.

[0024] Further, the insulating support rods are two or more and are distributed on the same circumference.

[0025] Further, the resistors are two or more and are on the same circumference with the insulating support rods, and at least one resistor is on both sides of the same insulating support rod with other resistors.

[0026] Beneficial effects: the utility model discloses an improved invention. The shielding cover of one end of the opening and closing resistance is in conduction with the isolated static end, and the shielding cover of the other end is in conduction with the resistance introduction conductor, the resistance introduction conductor is between the isolated static end and the isolated moving end, the resistance introduction conductor breaks down before the isolated static end and the isolated moving contact during the closing process of the isolating switch, the opening and closing resistance is automatically connected, and the VFTO is inhibited. During the opening process of the isolating switch, the resistance introduction conductor and the isolated moving contact break down with the increase of the distance between the isolated moving contact and the isolated static end, the opening and closing resistance is automatically connected, and the VFTO is inhibited. Since the perforation aperture of the resistance introduction conductor is larger than the outer diameter of the isolated moving contact, an air gap is formed between the resistance introduction conductor and the isolated moving contact when the isolated moving contact passes through, the resistance introduction conductor does not contact the isolated moving contact, and therefore the action of the isolated moving contact is not hindered during the opening and closing process, and the opening and closing speed is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic view of the embodiment of the isolating grounding switch with opening and closing resistance of the utility model;

[0028] Figure 2 It is Figure 1 It is a sectional view at Y-Y;

[0029] In the drawing: 1, switch housing; 2, moving end incoming and outgoing line basin; 3, isolated moving end; 4, isolated moving contact; 5, resistance introduction conductor; 6, third shielding cover; 7, second shielding cover; 8, isolated static end; 9, insulating support rod; 10, first shielding cover; 11, static end incoming and outgoing line basin; 12, grounding static contact; 13, grounding switch; 14, resistor. DETAILED DESCRIPTION

[0030] The existing opening and closing resistance structure is in contact with the isolation moving contact through the resistance contact, and the resistance contact will cause resistance to the opening and closing movement of the isolation moving contact, thereby affecting the opening and closing speed. The utility model discloses a kind of opening and closing resistance structure capable of avoiding resistance to isolation moving contact, and further improve the opening and closing speed. The basic inventive concept of the utility model is: the shield of one end of opening and closing resistance is used to be in conduction with isolation static end, the shield of other end is in conduction with resistance lead-in conductor, the hole diameter of resistance lead-in conductor is greater than the outer diameter of isolation moving contact, and air gap is formed between isolation moving contact when passing through, and air gap is broken down by high voltage, opening and closing resistance is automatically connected, resistance lead-in conductor is not in contact with isolation moving contact, thereby avoiding resistance lead-in conductor to cause resistance to the action of isolation moving contact, improve the opening and closing speed.

[0031] Based on the above inventive concept, the following will introduce the embodiment of the isolation grounding switch with opening and closing resistance of the utility model in detail.

[0032] As Figure 1 The isolation grounding switch with opening and closing resistance includes switch housing 1, and the switch housing 1 is provided with inlet and outlet line basin at both ends, and the switch housing 1 is provided with isolation moving end 3 and isolation static end 8, and the isolation moving end 3 is fixedly connected with the moving end inlet and outlet line basin 2 through bolts, and the isolation static end 8 is integrated with opening and closing resistance, and one end shield of the opening and closing resistance is fixedly connected with the static end inlet and outlet line basin 11 through bolts, and is in conduction with the isolation static end 8. The opening and closing resistance includes resistor 14 (see Figure 2 ), resistance lead-in conductor 5 and first shield 10 and second shield 7 connected at both ends of the resistor 14, and the two shields are fixedly supported through insulating support 9, wherein the first shield 10 is in conduction with the isolation static end 8, and the second shield 7 is in conduction with the resistance lead-in conductor 5. The resistance lead-in conductor 5 is coaxially arranged with the isolation moving contact 4, and the resistance lead-in conductor 5 has a perforation for the isolation moving contact 4 to move through, and the hole diameter of the perforation is greater than the outer diameter of the isolation moving contact 4, so that an air gap of about 3-5 mm is formed between the isolation moving contact 4 when passing through. The resistance lead-in conductor 5, the second shield 7, the resistor 14, the first shield 10 and the isolation static end 8 form a resistance loop.

[0033] In order to facilitate the positioning and installation of the resistance lead-in conductor 5, a sunken table is provided at the center position of the second shield 7, and the resistance lead-in conductor 5 is arranged at the sunken table. The resistance lead-in conductor 5 is a continuous bending thin-walled structure, which is light in weight and is convenient for fixed installation on the second shield 7. The resistance lead-in conductor 5 is lapped on the sunken table through the folded edge at one end and is fixedly connected with the sunken table, so that the resistance lead-in conductor 5 and the second shield 7 have a larger conductive contact area, and the conduction between them is more reliable.

[0034] The third shielding cover 6 is fixedly connected with the second shielding cover 7 and is in conduction, and the third shielding cover 6 is mainly arranged to protect the isolation static terminal 8 when the resistance lead-in conductor 5 is at a high potential, so as to avoid the air gap between the resistance lead-in conductor 5 and the isolation static terminal 8 from being broken down. The third shielding cover 6, the second shielding cover 7 and the resistance lead-in conductor 5 are fixedly connected by the same fastener, and the fastener is a screw. The third shielding cover 6 is provided with a threaded hole, and the screw is screwed in the threaded hole of the third shielding cover 6 after passing through the resistance lead-in conductor 5 and the second shielding cover 7 in sequence. The three are fixedly connected by the same fastener, the structure is more simplified, and the connection is more convenient.

[0035] The first shielding cover 10 comprises a support part and a cover part, and the support part and the cover part are in an integrated structure. The support part is fixedly connected with the static terminal access basin 11 by a bolt, is fixedly supported between the static terminal access basin 11 and the isolation static terminal 8 and is in conduction with the isolation static terminal 8. The cover part is located outside the support part. The overall weight of the first shielding cover 10 is relatively light, the bent support part is fixedly connected with the static terminal access basin 11 and will not cause great pressure to the static terminal access basin 11, which is beneficial to ensuring the connection reliability.

[0036] The isolation moving terminal 3 and the isolation static terminal 8 are further respectively integrated with a grounding switch 13. The grounding static contact 12 of the grounding switch 13 integrated with the isolation static terminal 8 is arranged on the support part of the first shielding cover 10. The grounding switch 13 is integrated with the isolation static terminal 8 or the isolation moving terminal 3, which reduces the number of switch equipment air chambers, saves the equipment floor area, reduces the cost and improves the operation reliability. In specific application, the grounding switch 13 can be arranged flexibly according to the overall arrangement requirement of the project, that is, the grounding switch 13 can be integrated with only the isolation static terminal 8 or the isolation moving terminal 3 or can be integrated with both the isolation static terminal 8 and the isolation moving terminal 3.

[0037] The two-end shielding covers of the closing and opening resistance are fixedly supported by the insulating support rods 9. In the embodiment, as shown in FIG. 4, the insulating support rods 9 are three and are uniformly distributed on the same circumference, and the three insulating support rods 9 provide uniform and reliable insulating support for the two-end shielding covers in the circumferential direction. Figure 2 The number of the resistors 14 needs to be determined according to the resistance value. In the embodiment, the resistors 14 are three and are all arranged on the same circumference with the insulating support rods 9, so that the structure of the closing and opening resistance is more compact and occupies less space in the switch housing 1. Preferably, at least one resistor 14 is arranged on both sides of the same insulating support rod 9 with other resistors 14, so that the arrangement positions of the resistors 14 in the circumferential direction are dispersed as much as possible, and the structure design is more reasonable and stable. In the embodiment, as shown in FIG. 4, the resistors 14 are three and are arranged on the same circumference with the insulating support rods 9. Figure 2As shown in the figure, three insulation support rods 9 are defined as first, second and third insulation support rods, two of the resistors 14 are located between the first and second insulation support rods in the circumferential direction, the other resistor 14 is located between the first and third insulation support rods in the circumferential direction, and the grounding static contact 12 of the grounding switch 13 integrated with the isolation static end 8 is located between the second and third insulation support rods in the circumferential direction.

[0038] The switching-on and switching-off resistor is arranged in the switch shell 1 and integrated with the isolation static end 8, the resistor introduction conductor 5 is located between the isolation static end 8 and the isolation moving end 3, the resistor introduction conductor 5 is broken down before the isolation static end 8 and the isolation moving contact 4 in the closing process of the isolation switch, the switching-on and switching-off resistor is automatically connected, the VFTO is suppressed, the switching-on and switching-off resistor is short-circuited after the isolation moving contact 4 contacts the isolation static end 8, and the switching-on and switching-off resistor is automatically disconnected.

[0039] Due to the fact that the perforated hole diameter of the resistor introduction conductor 5 is larger than the outer diameter of the isolation moving contact 4, an air gap is formed between the isolation moving contact 4 and the resistor introduction conductor 5 when the isolation moving contact 4 passes through the resistor introduction conductor 5, the resistor introduction conductor 5 does not contact the isolation moving contact 4, and therefore the action of the isolation moving contact 4 is not hindered in the switching-on and switching-off process, and the switching-on and switching-off speed is improved.

[0040] Of course, the utility model is not limited to the implementation modes in the above-mentioned embodiments.

[0041] For example, in another implementation mode, the sunken base can not be arranged at the center position of the second shielding cover, and the resistor introduction conductor is directly fixed on the second shielding cover.

[0042] For example, in another implementation mode, the resistor introduction conductor is of a ring-shaped solid structure, one side end surface of the resistor introduction conductor directly contacts the sunken base and is fixedly connected through a screw.

[0043] For example, in another implementation mode, the third shielding cover is fixedly connected and conductive with the second shielding cover through a screw fastener, and the second shielding cover is fixedly connected and conductive with the resistor introduction conductor through riveting.

[0044] For example, in another implementation mode, the first shielding cover and the second shielding cover are of the same structure, the first shielding cover is not bent to form a support part, the isolation static end has a static end support, the static end support is fixedly connected with a static end access pot, the isolation moving contact is arranged on the static end support and is conductive with the static end support, and the first shielding cover is directly conductive with the static end support.

[0045] For example, in another embodiment, the insulating support rods are provided with two or four or more, preferably, all the insulating support rods are uniformly distributed on the same circumference.

[0046] For example, in another embodiment, the number of resistors can be one, two, four or more. When the number of resistors is even, all the resistors can be arranged symmetrically left and right; when the number of resistors is odd, the positions of the resistors are staggered as much as possible in the circumferential direction.

[0047] The utility model also provides an embodiment of a closing and opening resistance, and the specific structure of the closing and opening resistance is same with the structure of the closing and opening resistance in the above embodiment of the isolating grounding switch with closing and opening resistance, and will not be repeated here.

[0048] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and the patent protection scope of the utility model is accurate with the claims, and equivalent structural changes made by applying the contents of the specification and drawings of the utility model should be included in the protection scope of the utility model.

Claims

1. A switching resistor, comprising a resistor and first and second shielding covers connected to both ends of the resistor, wherein the two shielding covers are fixedly supported by an insulating support rod, wherein the first shielding cover is used to conduct to the isolating stationary terminal, characterized in that: The resistance introduction conductor is in communication with the second shielding cover, has a through hole for the movable contact to pass through, and has a hole diameter larger than an outer diameter of the movable contact to form an air gap between the movable contact when the movable contact passes through.

2. The opening and closing resistor according to claim 1, characterized in that: The second shielding cover is provided with a sunken platform at a center position, and the resistance introduction conductor is arranged at the sunken platform.

3. The opening and closing resistor according to claim 2, characterized in that: The resistance introduction conductor is a thin-walled structure with continuous bending, and the resistance introduction conductor is fixedly connected with the sunken platform through a bent edge at one end.

4. The opening and closing resistor according to any one of claims 1 to 3, characterized in that: The second shielding cover is provided with a third shielding cover on a side facing the first shielding cover, and the third shielding cover is fixedly connected with the second shielding cover and in communication.

5. The opening and closing resistor according to claim 4, characterized in that: The third shielding cover, the second shielding cover, and the resistance introduction conductor are fixedly connected through the same fastener.

6. The opening and closing resistor according to any one of claims 1 to 3, characterized in that: The first shielding cover includes a support part and a cover part, the support part is used for supporting between the static end access line basin and the isolation static end and in communication with the isolation static end, and the cover part is outside the support part.

7. The opening and closing resistor according to claim 6, characterized in that: The support part is integrated with a grounded static contact.

8. The opening and closing resistor according to any one of claims 1 to 3, characterized in that: The insulating support rods are two or more and are distributed on the same circumference.

9. The opening and closing resistor according to claim 8, characterized in that: The resistors are two or more and are on the same circumference with the insulating support rods, and at least one resistor is on both sides of the same insulating support rod with other resistors.

10. An isolating grounding switch with opening and closing resistors, comprising an isolating moving contact and an isolating stationary contact, the isolating stationary contact being integrated with the opening and closing resistors, characterized in that: The opening and closing resistance is the opening and closing resistance of any one of claims 1-9.

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