WO2019024273A1

WO2019024273A1 - Functional module for constantly supplying power during cable expansion in gis

Info

Publication number: WO2019024273A1
Application number: PCT/CN2017/107463
Authority: WO
Inventors: 张长虹; 庞准; 李万民; 王海军
Original assignee: 中国南方电网有限责任公司超高压输电公司检修试验中心; 上海思源高压开关有限公司
Priority date: 2017-08-02
Filing date: 2017-10-24
Publication date: 2019-02-07
Also published as: CH714881A1; DE212017000020U1; CN107370063B; JP2019526144A; CN107370063A; CH714881B1

Abstract

Disclosed is a functional module for constantly supplying power during cable expansion in a GIS. The functional module comprises a housing, a double-break switch device, and a drive device, wherein the double-break switch device comprises a central conductor, moving contacts, fixed side contacts, a transmission rod, multi-joint push arms, and a linear reciprocating motion mechanism; the drive device drives the linear reciprocating motion mechanism such that the transmission rod moves in a vertically reciprocating manner, so that two multi-joint push arms synchronously push moving contacts at two sides to slide back and forth in the sliding passage; and the moving contacts protrude from the central conductor, and are then inserted, in cooperation with the fixed side contacts, in fixed contact holes so as to realize conduction between the fixed side contacts, which are at two sides. The functional module has the advantages of being able to carry out docking and installation without cutting off the power of an original running cable when a GIS cable is expanded and installed, having a simple structure, being convenient to operate, greatly reducing budget costs of an expansion end, and being suitable for wide application.

Description

GIS cable expansion without power failure function module

Technical field

The invention relates to the field of equipment of a converter station/substation of a voltage level of 220 kV and above, and particularly relates to a function module for cable expansion without power failure in GIS.

Background technique

With the development of the economy, GIS products rely on their own structure, small footprint, low operating failure rate, light weight, maintenance-free and other advantages have been more and more applications, taking the ultra-high pressure company as an example, to 2016 Among them, the number of substation/commutation stations of existing GIS equipment is 8, and the number of post-expansion requirements is 6.

From the current GIS equipment manufacturers' design for the second-stage expansion structure, there is only one isolation fracture between the second-stage expansion interval and the running bus. Therefore, the second-stage expansion installation and the withstand voltage test require the original operation bus to be powered off to avoid the fracture due to overvoltage. The risk of wearing. For the operating unit, coordinating the power outage of the substation bus line means delays in the progress of the project, waste of manpower and material resources, and direct or indirect economic losses caused by power outages. According to rough estimates, for a 500kV substation/conversion station, the direct economic loss of one day of power outage can reach several million yuan or more, and there are some substations, due to the special characteristics of upstream and downstream customers, such as large smelting plants, important government agencies, etc. The difficulty in coordinating the busbar power outage is extremely high, which seriously affects the commissioning time of the project and indirectly causes huge economic losses. Therefore, at the initial stage of the project bidding, more owners have clearly stated that the requirements for power outages of the previous equipment are not allowed in the subsequent GIS expansion process.

Some operation and maintenance units try to use the new GIS scheme and test methods to solve the requirements of the above equipment expansion without power failure. At present, there are two main methods: the use of bellows to connect GIS busbars and the same-frequency in-phase withstand voltage test technology. In both ways, the GIS running bus power failure is required to install the bellows docking or expansion equipment, and only the busbar is continuously operated during the power frequency withstand voltage handover test of the expansion equipment. Therefore, these two methods fail to solve the problem of non-stop busbar when GIS expansion equipment is perfect. At the same time, there are certain safety hazards. For example, the bellows docking section does not participate in the withstand voltage test, and only runs through it. After 24 hours of assessment, it is assumed that there are dust particles or tip burrs inside the docking section of the bellows, and there is a blind zone under the assessment of the operating phase voltage. In addition, some operation and maintenance units have proposed GIS same-frequency in-phase AC withstand voltage test technology and developed test equipment, which uses adjacent equipment operating voltage (such as take bus The secondary voltage of the voltage transformer is used as a reference voltage, and the test voltage is generated by the inductive series resonance method. This technology requires extremely high precision for phase angle control, and once the breakdown occurs in the test process interrupt, it will affect the normal operation of the busbar. Therefore, the promotion of the same-frequency in-phase withstand voltage technology is greatly limited, requiring resistance. During the pressing process, there is no discharge fault in the busbar isolation fracture. Otherwise, the grid power failure will occur, and there is a high risk.

The GIS manufacturer also partially improved the design structure. However, from the improved structure, only the functional modules are assembled and stacked on the original structure, and there are deficiencies in the original scheduling wiring diagram, large occupied space, and structural redundancy. Have the feasibility of implementation. In order to meet the demand of non-stop busbars in GIS expansion, it is urgent to design a GIS function module with small structure and safe and reliable operation. On the basis of meeting the relevant requirements of the technical specifications of the South Network, it is necessary to ensure the expansion and installation of GIS and the test of the connection withstand voltage. The original equipment can still operate safely and reliably.

Summary of the invention

The object of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide a cable expansion non-blackout function module in a GIS that can expand a cable without power failure.

The present invention is achieved by the following technical solutions:

The cable expansion non-power-off function module in GIS includes a casing, a double-break switch device and a driving device; the double-break switch device includes a center conductor, a moving contact, a static side contact, a transmission rod, a multi-joint push arm, and a linear reciprocating a moving mechanism; the axial center position of the center conductor is provided with a sliding passage that cooperates with the movable contact and penetrates the left and right sides, and a hollow hole communicating with the sliding passage is provided at a central portion of the center conductor, The inner cavity of the outer casing is a sealed space, and the static side contacts are disposed on both sides of the same horizontal axis of the inner cavity, and the static contact holes of the static side contacts are oppositely disposed; the center conductor is Coaxially disposed with the static contact hole at a center position of the two static side contacts; each of the sliding passages of the center conductor is provided with one of the movable contacts; one end of the transmission rod Two multi-joint push arms of the same structure are connected, and the other ends of the two multi-joint push arms are respectively connected to the movable contacts at both ends through the avoidance holes, and the transmission rods are away from the multi-joint push arms One end and a straight line The moving mechanism is connected, and the linear reciprocating mechanism is connected to the driving device; the driving device drives the linear reciprocating mechanism to reciprocate the transmission rod up and down, so that the two multi-joint pushing arms simultaneously push the movement on both sides The contact slides back and forth on the sliding passage, and the movable contact protrudes from the center conductor and is inserted into the static side contact The static contact holes enable the static side contacts on both sides to be turned on.

The improvement of the above solution further includes: a grounding contact seat; the grounding contact seat is provided with a grounding through hole that cooperates with the outer circumference of the transmission rod, and a grounding spring contact finger is disposed on the inner circumference of the grounding through hole; The central conductor is an electrical conductor, and the transmission rod is a conducting portion and an insulating portion from the side connected to the multi-joint pushing arm; the transmission rod is mounted on the grounding contact seat through the grounding through hole, When the transmission rod moves upward to move the two movable contacts relatively outward and protrudes from the center conductor, the insulating portion is connected with the ground spring contact finger; and the transmission rod moves downward to make two movements When the contact moves inwardly and receives the center conductor, the conducting portion is connected to the grounding spring contact finger; the grounding contact seat is mounted in the inner cavity of the outer casing and is electrically connected to the outer casing.

As a modification of the above aspect, the linear reciprocating mechanism includes a rack and a transmission gear; the rack is disposed on the insulating portion and the longitudinal direction of the rack is parallel to the axis of the propeller shaft; the driving device An output shaft is disposed, the transmission gear is coaxially mounted on the output shaft, and the transmission gear meshes with the rack.

As an improvement of the above solution, the linear reciprocating mechanism adopts a screw drive mechanism, and the insulating portion is provided with a screw thread portion.

As an improvement of the above solution, the linear reciprocating mechanism adopts a worm gear mechanism, and the insulating portion is provided with a worm portion.

As a modification of the above solution, the multi-joint push arm includes a first link, a second link, and a third link; the first link and the third link are strip bars, the first The two links are L-shaped rods, the first link, the second link and the third link are sequentially hinged and the hinge axes are parallel to each other; one end of the transmission rod is respectively connected with two multi-joint push arms The free ends of the first links are hinged and the hinge axes are parallel to each other, the L-shaped inner corners of the second links of the two multi-joint push arms are all inward, and the free ends of the third links are The movable contact is hinged at one end and the hinge axes are parallel to each other.

As an improvement of the above solution, the inner circumferences of the sliding passages are respectively provided with first spring fingers for engaging with the movable contacts; and the second static contact holes are provided with a second for engaging the movable contacts The spring touches the finger.

As an improvement of the above solution, a support insulator is disposed between the center conductor and the outer casing for fixing the position of the inner conductor in the inner cavity and insulating the center conductor from the outer casing.

As an improvement of the above solution, the outer casing is an electric conductor, and the inner cavity is a T-shaped passage, and the central conductor, the movable contact and the static side contact are arranged in a horizontal direction of the T-shaped passage. T-shaped channel The multi-joint push arm and the linear reciprocating mechanism are disposed in a vertical direction; and the driving device is disposed outside the outer casing.

The invention has the following beneficial effects:

It can be expanded and installed in the GIS cable. It can be docked and installed without powering off the original running cable. The structure is simple, the operation is convenient, and the preset cost of the expansion end is greatly reduced, which is suitable for wide-ranging application.

DRAWINGS

FIG. 1 is a schematic structural view of a cable expansion and non-power failure function module in the GIS of the present invention.

2 is a cross-sectional view showing the conduction state of a cable expansion non-power failure function module in the GIS of the present invention.

3 is a cross-sectional view showing the disconnected state of the cable expansion non-power-off function module in the GIS of the present invention.

DESCRIPTION OF REFERENCE NUMERALS: outer casing 1, driving device 2, conductor 3, moving contact 4, static side contact 5, transmission rod 6, multi-joint pushing arm 7, linear reciprocating mechanism 8, ground contact holder 9, sliding passage 10. The avoidance hole 11, the inner cavity 12, the static contact hole 13, the output shaft 14, the first spring contact finger 15, the second spring contact finger 16, the support insulator 17, the ground through hole 18, the ground spring contact finger 19, The electric conducting portion 20, the insulating portion 21, the rack 22, the transmission gear 23, the first link 24, the second link 25, and the third link 26.

Detailed ways

Example 1

As shown in FIG. 1 to FIG. 3, the cable expansion non-power-off function module in the GIS includes a casing 1, a double-break switch device, and a drive device 2; the double-break switch device includes a center conductor 3, a movable contact 4, and a static side. The contact 5, the transmission rod 6, the multi-joint pushing arm 7, the linear reciprocating mechanism 8, the grounding contact seat 9; the axial center position of the center conductor 3 is matched with the movable contact 4 and penetrates the left and right sides The sliding passage 10 is provided with a hollow hole 11 communicating with the sliding passage 10 at a central portion of the center conductor 3. The inner chamber 12 of the outer casing 1 is a sealed space, and two of the same horizontal axis of the inner chamber 12 The static side contacts 5 are disposed on the sides, and the static contact holes 13 of the static side contacts 5 are oppositely disposed; the center conductor 3 and the static contact holes 13 are coaxially disposed on the two sides. a central position of the static side contact 5; the movable contact 4 of the central conductor 3 is provided with one of the movable contacts 4; one end of the transmission rod 6 connects two multi-joints having the same structure The pushing arm 7 and the other ends of the two multi-joint pushing arms 7 respectively move through the hollow holes 11 and the two ends Head 4 is connected to a drive rod 6 away from the end of the multi-joint arm 7 to push The linear reciprocating mechanism 8 is connected to the driving device 2; the driving device 2 drives the linear reciprocating mechanism 8 to reciprocate the transmission rod 6 up and down, thereby making the two more The joint pushing arm 7 synchronously pushes the movable contacts 4 on both sides to slide back and forth on the sliding passage 10, and the movable contact 4 protrudes from the center conductor 3 to cooperate with the static side contact 5 The static contact holes 13 are inserted to electrically connect the stationary side contacts 5 on both sides. The inner circumference of both ends of the sliding passage 10 is provided with a first spring finger 15 for engaging with the movable contact 4; a second spring for engaging with the movable contact 4 is disposed on the static contact hole 13 Touch finger 16. A support insulator 17 is provided between the center conductor 3 and the outer casing 1 for fixing the position of the inner conductor 3 in the inner cavity 12 and insulating the center conductor 3 from the outer casing 1.

The grounding contact seat 9 is provided with a grounding through hole 18 that cooperates with the outer circumference of the transmission rod 6. A grounding spring contact finger 19 is disposed on the inner circumference of the grounding through hole 18; the center conductor 3 is an electrical conductor. The transmission rod 6 is in turn from the side connected to the multi-joint pushing arm 7 as the electric conducting portion 20 and the insulating portion 21; the transmission rod 6 is mounted on the grounding contact seat 9 through the grounding through hole 18, When the transmission rod 6 moves upward to move the two movable contacts 4 relatively outward and protrudes from the center conductor 3, the insulating portion 21 is connected with the ground spring contact finger 19; When the downward movement causes the two movable contacts 4 to move inward relative to each other and is received into the center conductor 3, the conducting portion 20 is connected to the grounding spring contact finger 19; the grounding contact seat 9 is mounted on the The inner cavity 12 of the outer casing 1 is electrically connected to the outer casing 1. The linear reciprocating mechanism 8 includes a rack 22 and a transmission gear 23; the rack 22 is disposed on the insulating portion 21 and the longitudinal direction of the rack 22 is parallel to the axis of the transmission rod 6; The device 2 is provided with an output shaft 14, which is coaxially mounted on the output shaft 14, the drive gear 23 meshing with the rack 22.

The multi-joint push arm 7 includes a first link 24, a second link 25, and a third link 26; the first link 24 and the third link 26 are strip bars, the first The two links 25 are L-shaped rods, and the first link 24, the second link 25, and the third link 26 are sequentially hinged and the hinge axes are parallel to each other; the one end of the transmission rod 6 is respectively more than two The free ends of the first link 24 connected by the joint pushing arm 7 are hinged and the hinge axes are parallel to each other, and the L-shaped inner corners of the second links 25 of the two multi-joint pushing arms 7 are all inward, the third The free end of the link 26 is hinged to one end of the movable contact 4 and the hinge axes are parallel to each other. The outer casing 1 is an electric conductor, and the inner cavity 12 is a T-shaped passage. The central conductor 3, the movable contact 4 and the static side contact 5 are arranged in the horizontal direction of the T-shaped passage. The vertical direction of the T-shaped channel is provided The multi-joint push arm 7 and the linear reciprocating mechanism 8 are described; the drive device 2 is disposed outside the outer casing 1.

Example 2

Different from the first embodiment, the linear reciprocating mechanism 8 employs a screw drive mechanism, and the insulating portion 21 is provided with a screw thread portion.

Example 3

Different from the first embodiment, the linear reciprocating mechanism 8 employs a worm gear mechanism, and the insulating portion 21 is provided with a worm portion.

The detailed description above is a detailed description of the possible embodiments of the present invention, which is not intended to limit the scope of the invention, and the equivalents and modifications of the present invention should be included in the scope of the patent. in.

Claims

The cable expansion non-power-off function module in GIS is characterized in that it comprises a casing, a double-break switch device and a driving device; the double-break switch device comprises a center conductor, a moving contact, a static side contact, a transmission rod, a multi-joint push An arm and a linear reciprocating mechanism; the center position of the center conductor is provided with a sliding passage that cooperates with the movable contact and penetrates the left and right sides, and a central portion of the center conductor is provided with a short-circuit communicating with the sliding passage a hole, the inner cavity of the outer casing is a sealed space, and the static side contacts are disposed on both sides of the same horizontal axis of the inner cavity, and the static contact holes of the static side contacts are oppositely disposed; The center conductor is disposed coaxially with the static contact hole at a center position of the two static side contacts; and the movable contact of the center conductor is provided with one of the movable contacts; One end of the transmission rod is connected to two multi-joint push arms of the same structure, and the other ends of the two multi-joint push arms are respectively connected to the movable contacts at both ends through the avoidance holes, and the transmission rods are far away from each other. One of the joint push arms The linear reciprocating mechanism is connected to the driving device; the driving device drives the linear reciprocating mechanism to reciprocate the transmission rod up and down, so that the two multi-joint pushing arms simultaneously push two The movable contact on the side slides back and forth on the sliding passage, and the movable contact protrudes from the center conductor, and the static contact is inserted into the static contact hole to make the two sides The static side contacts are turned on.
The cable expansion non-power failure function module of the GIS according to claim 1, further comprising a ground contact seat; wherein the ground contact seat is provided with a grounding through hole that cooperates with an outer circumference of the transmission rod, a grounding spring contact is disposed on the inner circumference of the grounding through hole; the central conductor is an electrical conductor, and the transmission rod is a conducting portion and an insulating portion from a side connected to the multi-joint pushing arm; the transmission rod Mounted on the ground contact base through the grounding through hole, and the insulating portion and the grounding spring contact finger when the driving rod moves upward to move the two moving contacts relatively outward and protrudes from the center conductor Connecting; when the driving rod moves downward to move the two moving contacts relatively inwardly and collects the center conductor, the conducting portion is connected with the grounding spring contact finger; the grounding contact seat is installed at The inner cavity of the outer casing is electrically connected to the outer casing.
The cable expansion uninterruptible function module of the GIS according to claim 2, wherein the linear reciprocating mechanism comprises a rack and a transmission gear; the rack is disposed on the insulating portion and the rack is The length direction is parallel to the axis of the drive shaft; the drive device is provided with an output shaft, the drive gear is coaxially mounted on the output shaft, and the drive gear meshes with the rack.
The cable expansion non-blackout function module in the GIS according to claim 2, wherein The linear reciprocating mechanism adopts a screw drive mechanism, and the insulating portion is provided with a screw thread portion.
The cable expansion non-power failure function module of the GIS according to claim 2, wherein the linear reciprocating mechanism adopts a worm gear mechanism, and the insulating portion is provided with a worm portion.
The cable expansion non-blackout function module of the GIS according to claim 1, wherein the multi-joint push arm comprises a first link, a second link, and a third link; the first link The third link is a strip-shaped rod, the second link is an L-shaped rod, and the first link, the second link, and the third link are sequentially hinged and the hinge axes are parallel to each other; One end of the transmission rod is respectively hinged with the free ends of the first connecting rods connected to the two multi-joint pushing arms, and the hinge axes are parallel to each other, and the L-shaped inner corners of the second connecting rods of the two multi-joint pushing arms are all inward. The free end of the third link is hinged to one end of the movable contact and the hinge axes are parallel to each other.
The cable expansion uninterruptible function module of the GIS according to claim 1, wherein both ends of the sliding passage are provided with first spring fingers for engaging with the movable contacts; A second spring finger for mating with the movable contact is provided on the head hole.
The cable expansion uninterruptible function module of the GIS according to claim 1, wherein a support insulator is disposed between the center conductor and the outer casing for fixing the center conductor at the inner cavity and the center conductor and the outer casing. Insulation.
The cable expansion uninterruptible function module of the GIS according to any one of claims 1 to 8, wherein the outer casing is an electric conductor, the inner cavity is a T-shaped passage, and the horizontal direction of the T-shaped passage is The central conductor, the movable contact and the static side contact are provided. The vertical direction of the T-shaped passage is provided with the multi-joint pushing arm and the linear reciprocating mechanism; the driving device is disposed outside the outer casing.