CH714881B1 - Function module for cable expansion in GIS without power off. - Google Patents

Abstract

The invention relates to a functional module for cable expansion in gas-insulated switchgear without disconnecting the current, which comprises a housing, a double-break switch device and a drive device; the double-break switch device comprising a center conductor (3), two movable contacts (4), two fixed contacts (5), a drive lever (6), two multi-joint push arms (7) and a linear reciprocating mechanism; wherein the driving device drives the linear reciprocating mechanism so that the driving lever (6) can perform up and down reciprocation so that the two multi-joint pushing arms (7) synchronously move the movable contacts (4) on both sides to the reciprocating and slide the lead on the sliding passage (10), and wherein after protruding from the center conductor (3), the respective movable contact (4) is cooperatively inserted with the associated fixed contact (5) into the fixed contact holes (13) so that the fixed Contacts (5) form a connection on both sides. When removing the GIS cables, a coupling installation can be performed without cutting off the power of the original operating cable. A simple structure is used and it is easy to operate. This greatly reduces the cost of the upgrade, making the present invention suitable for widespread use.

Description

TECHNICAL AREA

The present invention relates to the field of equipment for transformer stations with a voltage level of 220kV and more, in particular a function module for cable expansion in GIS without power cut.

STATE OF THE ART

With the economic development, GIS products with small space, low operation error rate, light weight, low maintenance need and other advantages are more and more widely used in the market. For example, in ultra-high voltage companies, by 2016, the number of substations with working GIS devices was eight, of which six had a need for later expansion. The abbreviation GIS stands for gas-insulated switchgear.

In known expansion methods by current GIS manufacturers, a space of the expansion of the second phase and an expansion bus are separated from each other only by insulation, which is why the current is switched off during the expansion of the second phase and the pressure test on the original operating bus in order to To avoid risk of breaking open due to overvoltage. For the operating companies, the coordination of the power cut-off of the transformer station bus means a delay in the work schedule, a waste of human and material resources, and direct or indirect economic loss caused by the power cut-off. According to rough estimates, a day's power cut at a 500kV transformer station can result in a direct economic loss of more than tens of millions of euros. Due to peculiarities of upstream and downstream customers who, for example, operate large smelting plants or who are important government agencies or the like, some transformer stations have a particularly great difficulty in bus power cut-off, so that, for example, a project commissioning is seriously affected and an indirect enormous economic loss is caused. The present invention is based on the requirement, which is often made explicit, that the power for pre-equipment does not have to be switched off when a GIS is expanded.

[0004] Some O&M companies have tried new GIS solutions and new experimental methods to solve the requirement for the above-described equipment to function without power cuts. Currently, two methods in particular form the current state of the art: on the one hand, a bellows is used to couple the GIS bus and, on the other hand, a pressure test technique of the same frequency and the same phase is used. In both methods, the power to the GIS service bus should be switched off in order to enable coupling of the bellows or installation of the extension devices. However, this only achieves the goal that the service bus is not switched off when the operating frequency pressure of the extension devices changes. Therefore, the two methods did not perfectly solve the problem of avoiding bus shutdown when removing the GIS devices. At the same time, there is also a certain security risk. For example, the crush test does not extend to the coupling portion of the bellows, so only a test is performed by live operation for 24 hours. If there are dust particles or peak burrs inside the coupling portion of the bellows, there will be a blind area when testing the operating phase voltage. In addition, some operation and maintenance companies have disclosed an AC equal frequency and phase printing technique of GIS and developed a testing apparatus in which an operating voltage of the adjacent apparatuses is used as a reference voltage. For example, a secondary side voltage from mutual sensors of the bus voltage is used. A test voltage is generated by a series resonance mode of a variable inductance. There is an extremely high requirement for the accuracy of the control of the phase angle. As soon as a breakdown of the insulation occurs during the test process, the normal operation of the bus is affected. As a result, the spread of the printing technique of the same frequency and the same phase is relatively severely restricted. It is required that in the pressure test process, the insulation break of the bus has no discharge error. Otherwise, a power failure error would occur with an extremely high risk.

[0005] GIS manufacturers have continued to make partial improvements to the structure. From the improved structure, only assembling and stacking of the functional modules based on the original structure are performed. The disadvantages here are that the original circuit diagram is changed, there is a large space requirement, and the structure is redundant. There is no way to do this. In order to meet the need of avoiding power cut at the GIS expansion interval, it is urgently needed to develop a GIS function module with small structure and safe, reliable operation. On the basis of meeting the relevant requirements of the China Southern Power Grid technical standards, it ensures that when the GIS is built out and the alternating pressure test is carried out, the original first-phase equipments can still have safe reliable operation.

CONTENT OF THE PRESENT INVENTION

It is an object of the present invention to provide a function module for cable expansion in GIS, with which cables can be expanded without the power being switched off.

The present invention is realized by the following technical solution: A function module for cable expansion in GIS without power cut comprises the features of claim 1.

According to a preferred embodiment of the present invention, the functional module may further comprise a grounding contact seat; a grounding through-hole cooperating with the outer periphery of the driving lever is provided at the grounding contact seat, a grounding spring contact finger being disposed on the inner periphery of the grounding through-hole; wherein the center conductor is an electrical conductor, an electrically conductive part and an insulating part being sequentially arranged on a side of the drive lever connected to the multi-joint push arm; wherein the driving lever is installed on the grounding contact seat through the grounding through-hole, wherein the insulating part is mechanically connected to the grounding spring contact finger only when the driving lever moves up and thus the two movable contacts move relatively outward and protrude from the center conductor; the electrically conductive part being both electrically and mechanically connected to the grounding spring contact finger when the drive lever moves downwards and thus the two movable contacts move towards each other and therewith relatively inwards towards the longitudinal axis of the mean and are received in the center conductor; and wherein the grounding contact seat is installed in the inner chamber of the housing and connected to the housing.

As an improvement of the above solution, the linear reciprocating mechanism comprises a rack and a pinion; wherein the rack is disposed on the insulating member and the length direction of the rack is parallel to the axis of the driving lever; wherein the driving device is provided with an output shaft, wherein the gear wheel is mounted coaxially on the output shaft, and wherein the gear wheel meshes with the rack.

As an improvement of the above solution, a worm gear with a worm wheel and a worm is used as the linear reciprocating mechanism, with a worm being arranged on the insulating part.

As an improvement of the above solution, the multi-joint push arm comprises a first connecting rod, a second connecting rod and a third connecting rod; wherein the first connecting rod and the third connecting rod are strip-shaped rods and the second connecting rod is an L-shaped rod, and wherein the first connecting rod, the second connecting rod and the third connecting rod are sequentially articulated with each other and the articulation axes are aligned parallel to each other; one end of the drive lever being articulated to a free end of the first connecting rod of the respective multi-jointed push arm and the joint axes being aligned parallel to one another, the inner angles of the L-shaped second connecting rods of the respective multi-jointed push arm being aligned with the longitudinal axis of the central conductor, and wherein the free end of the third connecting rod is articulated to one end of the moving contact and the articulation axes are aligned parallel to each other.

As an improvement of the above solution, a first spring contact finger is arranged on the inner circumference at both ends of the sliding passage for cooperation with the movable contact; a second spring contact finger being arranged at the fixed contact hole for cooperation with the movable contact.

As an improvement of the above solution, a post insulator is arranged between the center conductor and the housing so that the position of the center conductor in the inner chamber is fixed and the center conductor and the housing are isolated from each other.

As an improvement of the above solution, the housing is an electrically conductive body in the shape of a "T", in that the internal chamber of the housing forms a T-shaped passage, with in between the opposite free ends of the "T" of the housing in the T-shaped passage of the center conductor, the movable contacts and the fixed contacts are arranged. In the direction perpendicular to the free ends of the "T" of the T-shaped passage, the two multi-joint pushing arms and the linear reciprocating mechanism are arranged; wherein the drive device is arranged on the outside of the housing.

The present invention has the following advantages: When expanding the GIS cables, a coupling installation can be performed without cutting off the power of the original operating cable. A simple structure is used and it is easy to operate. This greatly reduces the cost of the upgrade, making the present invention suitable for widespread use.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 shows a schematic structural view of the function module for cable expansion in GIS without power off according to the present invention. FIG. 2 shows a sectional view of a connection state of the function module for cable expansion in GIS without power cut-off according to the present invention. FIG. 3 shows a sectional view of the shutdown state of the function module for cable extension in GIS without power shutdown according to the present invention.

DETAILED DESCRIPTION

First embodiment

As shown in Figures 1 to 3, a functional module for cable expansion in GIS without power off comprises a housing 1, a double-break switch device and a drive device 2, the double-break switch device having a center conductor 3, a movable contact 4, a fixed contact 5, a drive lever 6, a multi-joint push arm 7, a linear reciprocating mechanism 8 and a grounding contact seat 9; wherein a sliding passage 10 cooperating with the movable contact 4 and passing through the left and right sides is arranged at the shaft center position of the center conductor 3, wherein a clearance hole 11 communicating with the sliding passage 10 is provided at the center portion position of the center conductor 3, the inner chamber 12 of the housing 1 is a closed space with fixed contact 5 disposed on both sides of the same horizontal shaft of inner chamber 12, fixed contact holes 13 of fixed contact 5 being disposed opposite to each other; the center conductor 3 and the fixed contact holes 13 are arranged coaxially at the middle position of the two fixed contacts 5; a movable contact 4 is arranged at both ends of the sliding passage 10 of the center conductor 3; one end of the drive lever 6 is connected to two multi-joint push arms 7 in the same structure, the other end of the two multi-joint push arms 7 is connected through the clearance hole 11 to the movable contacts 4 at both ends, respectively, with an end opposite to the multi-joint push arm 7 of the drive lever 6 connected to the linear reciprocating mechanism 8, the linear reciprocating mechanism 8 being connected to the driving device 2; wherein the driving device 2 drives the linear reciprocating mechanism 8 so that the driving lever 6 can perform up and down reciprocation so that the two multi-joint pushing arms 7 synchronously move the movable contacts 4 on both sides to reciprocate on the Slide sliding passage 10, after protruding from the center conductor 3, the movable contact 4 is cooperatively inserted with the fixed contact 5 into the fixed contact holes 13 so that the fixed contacts 5 on both sides form a connection. On the inner periphery at both ends of the sliding passage 10, a first spring contact finger 15 is arranged for cooperation with the movable contact 4; a second spring contact finger 16 for cooperation with the movable contact 4 being arranged at the fixed contact hole 13 . A post insulator 17 is interposed between the center conductor 3 and the housing 1 so that the position of the center conductor 3 in the inner chamber 12 is fixed and the center conductor 3 and the housing 1 are insulated from each other.

On the grounding contact seat 9, there is provided a grounding through hole 18 cooperating with the outer periphery of the drive lever 6, and a grounding spring contact finger 19 is disposed on the inner periphery of the grounding through hole 18; the center conductor 3 is an electrical conductor, and on a side of the drive lever 6 connected to the multi-joint push arm 7, an electrically conductive part 20 and an insulating part 21 are successively arranged; the driving lever 6 is installed on the grounding contact seat 9 through the grounding through hole 18 with the insulating part 21 connected to the grounding spring contact finger 19 when the driving lever 6 moves upward and thus the two movable contacts 4 relatively move outward and out center conductor 3 protrude; the electrically conductive part 20 being connected to the grounding spring contact finger 19 when the drive lever 6 moves downwards and thus the two movable contacts 4 move relatively inwards and are accommodated in the center conductor 3; wherein the ground contact seat 9 is installed in the inner chamber 12 of the housing 1 and connected to the housing 1. The linear reciprocating mechanism 8 comprises a rack 22 and a pinion 23; the rack 22 is disposed on the insulating member 21 and the lengthwise direction of the rack 22 is parallel to the axis of the driving lever 6; the drive device 2 is provided with an output shaft 14, the gear wheel 23 is coaxially mounted on the output shaft 14, and the gear wheel 23 meshes with the rack 22.

The multi-joint push arm 7 comprises a first connecting rod 24, a second connecting rod 25 and a third connecting rod 26; wherein the first connecting rod 24 and the third connecting rod 26 are strip-shaped rods and the second connecting rod 25 is an L-shaped rod, wherein the first connecting rod 24, the second connecting rod 25 and the third connecting rod 26 are sequentially articulated with each other and the joint shafts are parallel to each other are aligned; one end of the drive lever 6 being articulated to a free end of the first connecting rod 7 connected to the two multi-jointed push arms 7 and the articulated shafts being aligned parallel to one another, with L-shaped inner angles of the second connecting rods 25 of the two multi-jointed push arms 7 each being directed towards the inside , and the free end of the third connecting rod 26 is pivoted to one end of the movable contact 4 and the hinge shafts are aligned parallel to each other. The case 1 is an electroconductive body, the inner chamber 12 of which is a T-shaped passage, and in the horizontal direction of the T-shaped passage, the center conductor 3, the movable contact 4 and the fixed contact 5 are arranged. In the vertical direction of the T-shaped passage, the multi-joint pushing arm 7 and the linear reciprocating mechanism 8 are arranged; wherein the drive device 2 is arranged on the outside of the housing 1.

Second embodiment

Unlike the first embodiment, the second embodiment uses a worm gear having a worm wheel and a worm as the linear reciprocating mechanism 8, and a worm is disposed on the insulating member 21.

The embodiments of the present invention are described in detail above.

REFERENCE LIST

1 Housing 2 Driving Device 3 Center Conductor 4 Movable Contact 5 Fixed Contact 6 Driving Lever 7 Multi-joint Push Arm 8 Linear Reciprocation Mechanism 9 Ground Contact Seat 10 Sliding Passage 11 Clearance Hole 12 Inner Chamber 13 Fixed Contact Holes 14 Output Shaft 15 First Spring Contact Finger 16 Second Spring Contact Finger 17 Support Insulator 18 Ground Through Hole 19 Ground spring contact fingers 20 Electrically conductive part 21 Insulating part 22 Rack 23 Gear wheel 24 First connecting rod 25 Second connecting rod 26 Third connecting rod

Claims (8)

1. Functional module for cable expansion in a gas-insulated switchgear without power cut-off, characterized in that it comprises a housing (1), a double-break switch device and a drive device (2); the double-break switch device comprising a center conductor (3), two movable contacts (4), two fixed contacts (5), a drive lever (6), two multi-joint push arms (7) and a linear reciprocating mechanism; wherein at a center position of the center conductor (3) a sliding passage (10) cooperating with the two movable contacts (4) arranged at the left and right ends of the center conductor (3) and passing through from the center position to the left and right sides is arranged, wherein at a middle portion position of the center conductor (3) is provided with a clearance hole (11) communicating with the slide passage (10), the housing (1) including an inner chamber (12) which is a closed space, on both opposite sides of the inner chamber (12 ) one of the fixed contacts (5) is arranged in the longitudinal direction, fixed contact holes (13) of the fixed contact (5) being arranged opposite to each other; wherein the center conductor (3) and the fixed contact holes (13) are arranged coaxially at the middle position of the two fixed contacts (5); the two movable contacts (4) being arranged at the two respective ends of the sliding passage (10) of the central conductor (3); the respective ends of the drive lever (6) being respectively connected to one end of one of the two multi-joint pushing arms (7) in the same structure, the other end of the two multi-joint pushing arms (7) being connected through the clearance hole (11) to the movable contacts (4 ) wherein an end of the drive lever (6) opposite to the respective multi-joint push arm (7) is connected to the linear reciprocating mechanism, the linear reciprocating mechanism being connected to the driving device (2); wherein the driving device (2) drives the linear reciprocating mechanism so that the driving lever (6) can perform a reciprocating motion in its longitudinal direction so that the two multi-joint pushing arms (7) synchronously move the movable contacts (4) on both sides to slide back and forth on the sliding passage (10), and after protruding from the central conductor (3), the respective movable contact (4) cooperates with the associated fixed contact (5) into the associated fixed contact hole ( 13) is plugged in so that the fixed contacts (5) on both sides form a mechanically as well as electrically interacting connection. 2. Functional module for cable expansion in a gas-insulated switchgear without power cut-off according to claim 1, characterized in that it further comprises a grounding contact seat (9), wherein a grounding through hole (18) cooperating with the outer circumference of the drive lever (6) is provided on the grounding contact seat (9). is provided, with a grounding spring contact finger (19) being arranged on the inner circumference of the grounding through-hole (18), with the center conductor (3) being an electrical conductor, with one side of the drive lever (6) connected to the respective multi-joint push arm (7) having an electrically conductive part (20) and an insulating part (21) are arranged; wherein the driving lever (6) is installed on the grounding contact seat (9) through the grounding through hole (18), wherein the insulating part (21) is mechanically connected to the grounding spring contact finger (19) only when the driving lever (6) moves up and thus the two movable contacts (4) move relatively outwards and protrude from the central conductor (3); and wherein the electrically conductive part (20) is both electrically and mechanically connected to the grounding spring contact finger (19) when the drive lever (6) moves downwards and thus the two movable contacts (4) move towards each other and in the center conductor ( 3) to be included; and wherein the grounding contact seat (18) is installed in the inner chamber (12) of the housing (1) and connected to the housing (1). 3. Functional module for cable extension in a gas-insulated switchgear without power cut-off according to claim 2, characterized in that the linear reciprocating mechanism comprises a rack (22) and a gear wheel (23); the rack (22) being arranged on the insulating part (21) and the longitudinal direction of the rack (22) being parallel to the axis of the driving lever (6); wherein the driving device is provided with an output shaft, wherein the gear wheel is installed coaxially on the output shaft, and wherein the gear wheel (23) meshes with the rack (22). 4. Functional module for cable expansion in a gas-insulated switchgear without current cut-off according to claim 2, characterized in that a worm gear is used as the linear reciprocating mechanism, and a worm is arranged on the insulating part (21). 5. Functional module for cable expansion in a gas-insulated switchgear without power cut-off according to claim 1, characterized in that the multi-jointed push arms (7) each comprise a first connecting rod (24), a second connecting rod (25) and a third connecting rod (26); wherein the first connecting rod (24) and the third connecting rod (26) are strip-shaped rods and the second connecting rod (25) is an L-shaped rod, wherein the first connecting rod (24), the second connecting rod (25) and the third connecting rod ( 26) successively articulated to each other and the axes of articulation are aligned parallel to each other; one end of the drive lever (6) being articulated to a free end of the first connecting rod (24) of the respective multi-joint push arm (7) and the joint axes being aligned parallel to one another, the inner angle of the L-shaped second connecting rod (25) of the respective multi-articulated push arm (7) are aligned with the longitudinal axis of the central conductor (3), and wherein the free end of the third connecting rod (26) is articulated to one end of the associated movable contact (4) and the articulation axes are aligned parallel to one another. 6. Functional module for cable expansion in a gas-insulated switchgear without power cut-off according to claim 1, characterized in that a first spring contact finger (15) for interaction with the movable contact (4) is arranged on the inner circumference at both ends of the sliding passage (10); a second spring contact finger (16) for cooperating with the movable contact (4) being arranged at the fixed contact hole (13). 7. Functional module for cable expansion in a gas-insulated switchgear without power cut-off according to claim 1, characterized in that a support insulator (17) is arranged between the center conductor (3) and the housing (1) so that the position of the center conductor in the inner chamber ( 12) is solid and the center conductor and case (1) are insulated from each other. 8. Functional module for cable expansion in a gas-insulated switchgear without power cut-off according to one of claims 1 to 8, characterized in that the housing (1) is an electrically conductive body in the shape of a "T", that the inner chamber (12) of the housing (1) also forms a T-shaped passage, with the center conductor (3), the movable contacts (4) and the fixed contacts (5 ) are arranged; in the direction perpendicular to the free ends of the "T" of the T-shaped passage, the two multi-joint pushing arms (7) and the linear reciprocating mechanism are arranged; and wherein the drive device (2) is arranged on the outside of the housing (1).