CN107871938B - Bypass shunt bridging device for double-circuit and multi-circuit line tension-resistant yoke plate - Google Patents

Abstract

The invention discloses a bypass shunt bridging device for a double-circuit and multi-circuit strain yoke, which belongs to the technical field of circuit maintenance equipment, wherein a bypass shunt line is arranged by a ground potential operating rod, the shunt line can shunt the total current which originally passes through the strain yoke, can be used as a temporary substitute when the strain yoke fails, ensures the normal operation of cables, reduces the temperature of the strain yoke in a short time by installing the bypass shunt line in an electrified manner, reduces the load of the strain yoke according to the temperature of the strain yoke and the position of a drainage wire, and the strain yoke is shunted to reduce the load of the yoke by installing the bypass shunt line by the ground potential operating rod, and the shunt line is used as a bearing wire and the yoke to simultaneously overflow, so that the resistance impedance of the problem yoke is reduced, and can also be used as a backup when the yoke is abnormal; meanwhile, the overhauling staff does not need to enter into dangerous potential of the iron tower for overhauling, so that personal safety of the overhauling staff is guaranteed.

Description

Double-circuit and multi-circuit line tension-connected plate bypass shunt bridging device

technical field

The invention belongs to the technical field of line maintenance equipment, and relates to a tension connection plate in a power system, in particular to a tension connection plate bypass shunting bridge device for double-circuit and multi-circuit lines.

Background technique

The stable operation of the tension joint plate in the power line system is an important part of the safety of the power grid. Due to factors such as humidity, temperature, wind force, high-voltage vibration and other factors of the tension joint plate of the high-voltage transmission line, the loosening resistance of the tension joint plate bolts increases, resulting in Overload heating phenomenon, as the overheating time prolongs, if it is not dealt with in time, the tension-resistant board will be blown. At present, the ground potential repair method is often used to deal with the heat generated by the tension plate of the single-circuit high-voltage transmission line when the bolts are loose and overloaded. With the continuous improvement of power grid construction and planning standards, the high-voltage transmission line is changing from the original single-circuit line to With the development of double-circuit and multi-circuit towers, the conductors of double-circuit lines on the same tower are generally arranged vertically. Due to the compact structure of the tower, the space distance between the live conductors and the tower body can basically only meet the requirements of normal wind deflection and lightning protection overvoltage operation of the line. Requirements, but when personnel enter the potential with the help of insulating flat ladders, insulating soft ladders and other tools, the combination gap is not enough, the electric field protection technology is not clear, the safety distance margin is small, and the cross-arm spacing and clearance distance are small, and the ground potential live maintenance cannot be used.

Under the existing technical conditions, maintenance personnel are helpless to repair the serious hidden dangers of double-circuit and multi-circuit tower bolts loosening, overloading and heating. , The requirements for stable operation are getting higher and higher, and the number and frequency of power outages on important lines should be reduced as much as possible, and the emergency handling capacity under special circumstances should be improved. The development of live work is imperative. Therefore, it is of great practical significance to solve the problem of loosening and overloading of small-pitch tension plate bolts.

Contents of the invention

In order to solve the above-mentioned problems, the present invention designs a double-circuit and multi-circuit line tension joint plate bypass shunt bridge device. By installing the bypass shunt line with electricity, the load is reduced in a short time and the tension joint plate is reduced. Temperature, according to the location of the tension connecting plate and the drain line, install the bypass shunt line through the ground potential operating lever to shunt the tension connecting plate to reduce the load of the connecting plate, and use the shunt line as the load line and the connecting plate to flow at the same time. Reduce the resistance impedance of the faulty connecting board, and it can also be used as a backup when the connecting board is abnormal; at the same time, the maintenance personnel do not need to enter the dangerous potential of the iron tower for maintenance, which ensures the personal safety of the maintenance personnel.

In order to achieve the above object, the technical means adopted in the present invention are:

Double-circuit and multi-circuit line strain-resistant plate bypass shunt bridge device, the device includes wire clamps and drainage wire clamps, characterized in that: the wire clamps and drainage wire clamps both include threaded structures to adjust The opening clip with the width of the opening, the opening clip includes a fixed clip with a square structure and a pressure plate located in it and matched with one side thereof, the thread structure includes a stud connected with the pressure plate and a threaded hole in the fixed clip, and the outside of the stud The end is connected with a rotary operating mechanism, and a conductive bridge wire is connected between the wire clamp and the fixing frame of the drain wire clamp.

The rotation control mechanism of the drain wire clip includes a bevel gear mechanism connected to the outer end of the stud, the bevel gear mechanism includes a first-stage bevel gear and a second-stage bevel gear meshed, the outer end of the stud and the middle part of the first-stage bevel gear A prism and a prismatic hole are respectively provided, and the prism and the prismatic hole are axially slidable and circumferentially limited. The outer end of the rotating shaft of the secondary bevel gear is provided with an insulating control rod by means of a loose connection adjustment mechanism.

The rotating operating mechanism of the wire clamp includes an insulating operating rod connected to the outer end of the stud by means of a loose connection adjusting mechanism.

The loose connection adjustment mechanism includes a sleeve with a C-shaped slideway on the outer wall, a bolt shaft located in the sleeve is provided at one end of the insulating joystick, and a gun moving along the C-shaped slideway is arranged on the outer wall of the bolt shaft. Bolt, the outside of the inner end of the sleeve is fixedly connected with the corresponding rotating shaft or the outer end of the stud, the inner end of the sleeve is provided with a magnet, and the magnet is fixedly connected with the inner end of the bolt shaft by adsorption.

The conductive bridge wires are annealed copper wires.

The specifications of the first-stage bevel gear and the second-stage bevel gear are bevel gears with 90 degrees, 1:1 matching, 1.5 modules, and 16 teeth.

The beneficial effect of the invention is: the device can prevent maintenance personnel from going to the iron tower for maintenance, and only needs to rotate the insulating operating rod on the ground. For wire clamps, turning the insulating operating lever drives the screw to rotate, and the screw pressure plate also moves up and down to clamp or loosen the wires; for drain wire clamps, when the insulating operating lever is turned on the ground, the engaged secondary bevel gear drives The first-stage bevel gear, the first-stage bevel gear drives the prism structure on the upper part of the screw to rotate, the lower part of the screw rotates in the threaded hole, the screw drives the pressure plate to move up and down, clamps or loosens the drainage line, and the meshing bevel gear changes the direction of power transmission , It is more convenient for the maintenance personnel to place the wire clamp on the ground. The conductive bridge wire is used as a shunt line, and it flows through the connecting board at the same time, reducing the resistance impedance of the problem connecting board, and can also be used as a backup when the connecting board is abnormal.

Description of drawings

Fig. 1 is a structural schematic view of the wire clamp and the drain clamp in working state;

Fig. 2 is a schematic structural view of the drainage wire clamp;

Fig. 3 is a structural schematic diagram of the wire clamp.

In the figure, 1. Insulated operating rod, 2. Bolt shaft, 3. Sleeve, 4. Magnet, 5. Rotating shaft, 6. Drainage wire, 701, primary bevel gear, 702, secondary bevel gear, 8, screw, 801. Prismatic structure, 9. Lead wire, 10. Flange, 11. Press plate, 12. Conductive bridge wire, 13. Fixing clip, 14. C-shaped slideway, 15. Gun bolt.

Detailed ways

The invention installs the bypass shunt line with electricity to reduce the resistance and the current flowing through the tension joint plate in a short time, so as to reduce the temperature of the tension joint plate. According to the location of the tension connection plate and the drain line, install the bypass shunt line with the help of the ground potential operating lever. As a temporary replacement to ensure the normal operation of the cable.

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

Concrete embodiment, as shown in Figure 1,

The device comprises a wire clamp and a drain wire clamp, and the wire clamp and the drain wire clamp both include an opening clamp that adjusts the width of the opening by means of a threaded structure, and the opening clamp includes a fixed clip 13 of a Z-shaped structure and is located therein and together with it. The pressure plate 11 matched with the side, the thread structure includes the threaded stud 8 connected with the pressure plate 11 and the threaded hole in the fixing clip, the outer end of the stud 8 is connected with a rotating operating mechanism, a fixing frame for the wire clamp and the drain wire clamp Conductive bridge wires 12 are connected therebetween. The conductive bridge wire 12 is used as a shunt line to flow through the connecting board at the same time, reduce the resistance impedance of the problem connecting board, and can also be used as a backup when the connecting board is abnormal.

As shown in Figure 2, the rotation control mechanism of the drain wire clamp includes a bevel gear mechanism connected to the outer end of the stud 8, the bevel gear mechanism includes a first-stage bevel gear 701 and a second-stage bevel gear 702 that are engaged, and the outer end of the stud 8 There are prisms 801 and prismatic holes at the end and the middle part of the first-stage bevel gear 701, respectively. The prism 801 and the prismatic holes are axially slidable and circumferentially limited. The outer end of the rotating shaft 5 of the second-stage bevel gear 702 is loosened The connection adjustment mechanism is provided with an insulating joystick 1 . In this embodiment, the specifications of the first-stage bevel gear 701 and the second-stage bevel gear 702 are bevel gears with 90 degrees, 1:1 matching, 1.5 molds, and 16 teeth. The insulated operating rod 1 rotates, and the movement between the two phases of the meshing bevel gear transmits the power to the hexagonal prism, with stable transmission, large torque, compact structure, and small footprint. The rotation of the insulating operating rod 1 drives the bevel gear to rotate the bolt to rotate and feed, and the thread travel generates pressure to compress the drain wire 6 . Therefore, the pressure value of the pressing plate is satisfied, and the current passability of the clamp of the device is improved.

The gear sleeve of the first-stage bevel gear 701 is fixedly connected to the fixing clip 13 by means of the flange 10, and the drain wire clamp adjusts the opening direction of the fixing clip 13 by means of the flange 10 to cope with different ground conditions. When the ground cannot stand or use, adjust the direction of the fixing clip 13 and the pressure plate 11 with the help of the flange 10, no matter which direction the person stands, ensure that the fixing clip 13 and the drainage line 6 are perpendicular to each other, which is easy to operate; the prism 801 is a hexagonal prism, and The special bevel gear changes the direction of power transmission, and also provides convenience for the maintenance personnel to control the upper drainage wire clamp when the ground is upward.

As shown in FIG. 3 , the rotating operating mechanism of the wire clamp includes an insulating operating rod 1 connected to the outer end of the stud 8 by means of a loose connection adjusting mechanism.

The loose connection adjustment mechanism includes a sleeve 3 with a C-shaped slideway 14 on the outer wall. One end of the insulating joystick 1 is provided with a bolt shaft 2 located in the sleeve 3. The outer wall of the bolt shaft 2 is provided with a C-shaped slideway. 14 The gun bolt 15 that moves, the outside of the sleeve 3 inner end is fixedly connected with the corresponding rotating shaft 5 or the outer end of the stud 8, the inner end of the sleeve 3 is provided with a magnet 4, and the magnet 4 is adsorbed and fixedly connected with the bolt shaft 2 inner end. The insulating operating rod 1 is fixed to the rotating shaft 5 by means of the magnet 4, fixed to the sleeve 3 by means of the gun bolt 15, and connected to the bolt shaft 2, the sleeve 3 and the rotating shaft 5 as a whole, and the insulating operating rod 1 can be rotated as a whole, If you want to remove the insulating operation rod 1, just turn it in the opposite direction and pull it outward. Using the magnetic force of the magnet 4, without using tools such as bolts, the maintenance personnel can also install or remove the insulating operation when the distance between the ground and the upper end is far away. pole.

Conductive bridge wire 12 is a soft copper bridge wire, and Table 1-1 shows the conductivity and temperature coefficient of resistance of commonly used metal materials:

Table 1-1 Resistivity and temperature coefficient of resistance of commonly used metal materials

The selection of conductive bridge wire 12 is mainly considered from the aspect of electrical performance. In this embodiment, annealed copper wire is selected. It can be seen from the table that the resistivity of copper at 20 ° C is 1.72x10 ^-8 (Ω.m), and the temperature coefficient of resistance is 0.0041 (°C ^-1 ), melting point 1083.4 (°C) tensile strength 200～210 (N/mm ² ) linear expansion coefficient 16.6x10 ^-6 (°C ^-1) ) annealed copper wire has the smallest power loss, and has enough power at room temperature Mechanical strength, corrosion resistance, high temperature resistance, easy processing. Made with a diameter of 30mm ² , the carrying capacity can reach 130A. The withstand voltage test and over-current test have been done, the loading area matches the voltage level, the voltage drop and the temperature rise at full load do not exceed the allowable value, and pass the verification.

Operation steps for maintenance with this device:

A: Before use, insert the bolt shaft 2 connected to the insulating operating rod 1 into the sleeve 3, press the magnet 4 and turn the bolt 15 into the C-shaped slideway 14 of the bolt 15, and block the bolt shaft 2;

B: Confirm the position of the large or small side of the tower before installation. The wire clamps are mainly used on the small side of the tension tower, and the drain wire clamps are mainly used on the large side of the tension tower. The drain wire clamps are used for clamping Before the drainage line enters the tower potential, adjust the opening direction of the flange plate 10 according to the angle of the drainage line 6. The middle of the wire clamp and the drainage line clamp is connected by a soft copper wire of 25 square millimeters. Two people operate and install at the same time. Keep a safe distance between the person and the charged body, and the two insulating rods enter the potential at the same time during operation;

C: Two operators hold insulating rods to align the opening of the fixing clip 13 with the end of the wire and the end of the drain wire and insert them respectively, and rotate clockwise. The screw pushes the pressure plate 11 to clamp the wire 9 and the drain wire 6. After inspection, the clamp pressure plate is confirmed. 11 After the wire 9 is firmly connected, the operator holds the insulating rod and presses the sleeve magnet 4 outwards, turns the insulating operating rod 1 to make the gun bolt 15 withdraw from the C-shaped slideway 14, and the insulating operating rod 1 and the bolt shaft 2 It can be withdrawn along the C-shaped slideway 14 and separated from the shunt device sleeve 3 to complete the installation.

The invention is a shunting method for bypass operation, which can effectively increase the contact area of the tension joint plate, reduce the passing current of the tension joint plate, and reduce the resistance impedance of the problematic joint; effectively reduce the load of the tension joint plate, and can reduce the tension joint plate The high temperature is reduced by less than 70%; the successful application of this method will expand the field of live maintenance of multi-circuit lines on the same tower in a wider range. will play a more active role. Ensure the continuous power supply of users, so as to improve the safe operation of the power-guaranteed line, strengthen the planning and timeliness of inspection; it can handle the overheating defect of the tension-resistant board without affecting the line load and changing the operation mode of the power grid.

From August to December 2016, the staff of my research team conducted repeated simulation tests on this operation method and supporting tools and equipment in the tension tower of multi-circuit power outage lines, and conducted voltage and overcurrent tests on conductive bridge lines, and compiled supporting equipment. Standardized work instructions. Using this operation method, the installation and transition tasks of three 110kv and two 220kv multi-circuit power protection lines on the same tower were successfully completed. The tested combination gap size meets the requirements of live live safe operation. Calculated on the basis of a 110kv line with a load of 65,000 kw, the power outage rescue operation requires at least 4n line power outages (including power outage operations, work permits and termination procedures, and power transmission operations) and will lose 260,000 kw.m of power supply Above, calculate the direct economic loss of 130,000 yuan at 0.5 yuan per kWh. From August 2016 to August 2017, a total of 7 potential heating hazards of tension-resistant boards were found in the 110kv-220kv multi-circuit protection lines of the same tower in our work area. If power outages are required, more than 30 hours of power supply time will be caused, resulting in direct economic losses of 260 ten thousand yuan.

Claims (3)

1. Double-circuit, many circuit strain insulator yoke plates bypass shunt bridging device, the device includes wire fastener and drainage wire fastener, its characterized in that: the wire clamp and the drainage wire clamp both comprise an opening clamp for adjusting the width of the opening by means of a thread structure, the opening clamp comprises a U-shaped fixing clamp (13) and a pressing plate (11) which is arranged in the U-shaped fixing clamp and matched with one side of the U-shaped fixing clamp, the thread structure comprises a stud (8) connected with the pressing plate (11) and a threaded hole in the fixing clamp, the outer end of the stud (8) is connected with a rotary operating mechanism, and a conductive bridge wire (12) is connected between fixing frames of the wire clamp and the drainage wire clamp;

the rotary operating mechanism of the drainage wire clamp comprises a bevel gear mechanism connected with the outer end of a stud (8), the bevel gear mechanism comprises a primary bevel gear (701) and a secondary bevel gear (702) which are meshed with each other, a prism (801) and a prismatic hole are respectively arranged in the middle of the outer end of the stud (8) and the primary bevel gear (701), the prism (801) and the prismatic hole are axially sliding and are in circumferential limit fit, and an insulating operating rod (1) is arranged at the outer end of a rotating shaft (5) of the secondary bevel gear (702) by means of a loose connection adjusting mechanism;

the rotary operating mechanism of the wire clamp comprises an insulating operating rod (1) connected to the outer end of the stud (8) by means of a loose connection adjusting mechanism;

the loose connection adjusting mechanism comprises a sleeve (3) with a C-shaped slide way (14) on the outer wall, a bolt shaft (2) positioned in the sleeve (3) is arranged at one end of an insulating control rod (1), a bolt (15) moving along the C-shaped slide way (14) is arranged on the outer wall of the bolt shaft (2), the outer part of the inner end of the sleeve (3) is fixedly connected with the outer end of a corresponding rotating shaft (5) or a stud (8), a magnet (4) is arranged in the inner end of the sleeve (3), and the magnet (4) is fixedly connected with the inner end of the bolt shaft (2) in an adsorption mode.

2. The double-circuit and multi-circuit line tension-resistant yoke plate bypass shunt bypass device according to claim 1, wherein: the conductive bridge wire (12) is a annealed copper wire.

3. The double-circuit and multi-circuit line tension-resistant yoke plate bypass shunt bypass device according to claim 1, wherein: the specifications of the primary bevel gear (701) and the secondary bevel gear (702) are 90 degrees, 1:1 pairing, 1.5 die and 16 tooth bevel gears.

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