Universal bypass drainage device

Abstract

The invention discloses a universal bypass drainage device, and belongs to the technical field of power equipment, the universal bypass drainage device comprises two fixing blocks connected by a copper core stranded wire, a first arc-shaped claw and a second arc-shaped claw, one side of each fixing block is provided with a second arc-shaped part for placing an electric wire, the first arc-shaped claw is fixed on one side of the second arc-shaped part on the fixing block, and the second arc-shaped claw is fixed on the other side of the second arc-shaped part. An arc-shaped plate is rotationally arranged on the portion, located on the other side of the second arc-shaped part, of the fixing block, a second arc-shaped claw is fixed to the arc-shaped plate, the first arc-shaped claw and the second arc-shaped claw are arranged in a staggered mode, a butterfly bolt is arranged at one end of the fixing block in a penetrating mode, and the end of the butterfly bolt is rotationally connected with the arc-shaped plate. The universal bypass drainage device has the advantages that the universal bypass drainage device is high in installation speed and easy and convenient to operate, and installation of the auxiliary drainage wire can be achieved only by one person; and the auxiliary drainage wire (soft copper stranded wire) is light in weight, small in size and convenient to carry, and copper is good in heat-conducting property, so that heat dissipation of equipment is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of electric power equipment, in particular to a universal bypass drainage device. Background Art

[0002] During the operation of ultra-high / ultra-high voltage transmission lines, the problem of drainage plate heating often occurs, especially when the line is overloaded or overloaded during the peak summer season. The temperature caused by these heating problems can reach 200℃ or even above 500℃. If not handled in time, when the temperature reaches the melting point of the metal material (660℃), the drainage plate will melt, causing the jumper to fall off, which will cause the line to trip, and even cause the entire power grid to become unstable, causing serious economic and property losses; if the drainage plate heating problem is handled by power outage, during the processing, the load in the affected area needs to be transferred to other power sources or lines, but this transfer process is relatively cumbersome. If the operation is not timely or smooth, it may cause part of the load to be unable to be transferred in time, causing overload or insufficient power supply in some areas of the power grid. In addition, even if the power outage is completed, it will take a certain amount of time to restore power supply, including checking the status of the line equipment and gradually restoring power transmission. During this period of time, some areas or users may not be able to get power supply in time, causing fluctuations and instability in the power grid load. In order to avoid economic losses, live working is usually adopted for processing.

[0003] When the National Power Transmission and Transformation Company is dealing with the problem of drainage plate heating, the current operation method is that the operator brings a parallel groove wire clamp and a drainage wire of the same cross-section to the work site, and installs a drainage wire at both ends of the heated drainage plate (the conductor end and the jumper end), and the two ends are connected by a parallel groove wire clamp. When the electrician arrives at the work site, he first installs the parallel groove wire clamp on the conductor side, ensures that the bolts are tightened, and then moves to the jumper side and installs the parallel groove wire clamp on the jumper side.

[0004] like Figure 4-5 As shown, the existing drainage device is insufficient and the structure of the device is complicated. As shown in the figure, the parallel groove wire clamp has many bolts, which are easy to fall when dismantling and assembling, which may cause the risk of falling objects from high altitude. In addition, the device requires two people to cooperate during the installation process, one person holds the parallel groove wire clamp device and the auxiliary drainage line, and the other person tightens the bolts. The installation of the parallel groove wire clamp is relatively complicated and the whole process is time-consuming. Especially during the hot summer weather, the physical fitness requirements of the operators are high. The continuous high temperature environment may cause heat stroke to the operators. If not handled properly, it may even endanger the life safety of the operators.

[0005] The commonly used parallel groove wire clamps are slow to install and cannot be installed quickly to cool down the heated wires.

[0006] There are many types of existing UHV line conductors, with cross-sectional areas ranging from 400-1250mm 2Different cross-sectional areas of conductors require different parallel groove clamp devices to clamp the conductors and drainage wires, which makes the preparation process cumbersome.

[0007] The secondary drainage line uses steel core aluminum stranded wire. Due to the limitations of the parallel groove wire clamp device, it is necessary to use wires with the same cross-section. A 400-1250mm 2 The steel core aluminum stranded wire is heavy and inconvenient to carry. Summary of the invention

[0008] In view of the deficiencies in the prior art, an object of the present invention is to provide a universal bypass drainage device.

[0009] The technical solution of the present invention is as follows: A universal bypass drainage device comprises two fixed blocks connected by copper core twisted wires, a first arc-shaped claw and a second arc-shaped claw, a second arc-shaped portion for placing the electric wire is provided on one side of the fixed block, a first arc-shaped claw is fixed on one side of the second arc-shaped portion of the fixed block, an arc-shaped plate is rotatably provided on the other side of the second arc-shaped portion of the fixed block, a second arc-shaped claw is fixed on the arc-shaped plate, the first arc-shaped claw and the second arc-shaped claw are staggered, a butterfly bolt is passed through one end of the fixed block, and the end of the butterfly bolt is rotatably connected to the arc plate.

[0010] Preferably, a first arc-shaped portion is provided on the fixing block on the same side as the second arc-shaped portion, and a space on one side of the first arc-shaped portion is provided for the arc-shaped plate to unfold.

[0011] Preferably, a first fixing tube is fixed to one end of the fixing block, a through hole for a butterfly bolt to pass through is opened in the middle of the first fixing tube, a first rotating shaft is rotatably arranged inside the first fixing tube, and the butterfly bolt passes vertically through the first rotating shaft.

[0012] Preferably, a third fixing tube is fixed on the arc plate, a slot for the end of the butterfly bolt to pass through is opened in the middle of the third fixing tube, a third rotating shaft is rotatably arranged inside the third fixing tube, and the third rotating shaft and the butterfly bolt are vertically connected.

[0013] Preferably, a second fixing tube is fixed on the fixing block at one side of the second arc-shaped portion, an arc-shaped notch is opened on the second fixing tube, a second rotating shaft is arranged inside the second fixing tube, and an arc-shaped plate is fixedly connected to the second rotating shaft at the position of the arc-shaped notch.

[0014] Preferably, when the first arc-shaped claw and the second arc-shaped claw clamp the wire;

[0015] First state: the ends of the first arc-shaped claw and the second arc-shaped claw are in the same straight line;

[0016] Second state: the first arc-shaped claw and the second arc-shaped claw are in a crossed state.

[0017] Preferably, a fixing notch for connecting the copper core stranded wire is provided at the bottom of the fixing block, the fixing block and the copper core stranded wire are fixedly connected, and the right angle of the fixing notch is larger than the diameter of the copper core stranded wire.

[0018] Preferably, the first arc-shaped portion, the second arc-shaped portion and the arc-shaped plate have the same arc angle.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This universal bypass drainage device has fast installation speed and easy operation. Only one person is needed to install the auxiliary drainage line. The auxiliary drainage line (soft copper stranded wire) is light in weight and small in size, which is convenient to carry. The copper has good thermal conductivity, which helps the equipment to dissipate heat.

[0021] 2. Compared with the multiple bolts of the parallel groove wire clamp device, the structure of this device is greatly simplified and the working efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0023] Figure 1 It is a schematic structural diagram of the universal bypass drainage device of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure when the first arc-shaped claw and the second arc-shaped claw are connected in the present invention;

[0025] Figure 3 It is a schematic diagram of the structure when two fixing blocks of the present invention are connected;

[0026] Figure 4 It is a structural schematic diagram of the bypass drainage device of the background technology of the present invention when it is connected;

[0027] Figure 5 It is a schematic structural diagram of a clamping device according to the background technology of the present invention.

[0028] Notes in the figure: 10, fixed block; 11, first arc-shaped portion; 12, second arc-shaped portion; 13, fixed notch; 20, first fixed tube; 21, first rotating shaft; 30, arc plate; 31, second fixed tube; 32, second rotating shaft; 40, first arc-shaped claw; 50, second arc-shaped claw; 60, third fixed tube; 61, third rotating shaft. DETAILED DESCRIPTION

[0029] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the present invention.

[0030] like Figure 1 and Figure 3 As shown, as a universal bypass drainage device of the present invention, it includes two fixed blocks 10 connected by copper core twisted wires, a first arc claw 40 and a second arc claw 50, a second arc portion 12 for mounting the electric wire is provided on one side of the fixed block 10, the first arc claw 40 is fixed on one side of the second arc portion 12 of the fixed block 10, an arc plate 30 is rotatably provided on the other side of the second arc portion 12 of the fixed block 10, the second arc claw 50 is fixed on the arc plate 30, the first arc claw 40 and the second arc claw 50 are staggered, a butterfly bolt 70 is passed through one end of the fixed block 10, and the end of the butterfly bolt 70 is rotatably connected to the arc plate 30.

[0031] Specifically, the wire that needs to be drained is placed in the space between the first arc-shaped claw 40 and the second arc-shaped claw 50, and the wire is clamped by the first arc-shaped claw 40 and the second arc-shaped claw 50. The user rotates the butterfly bolt 70 to drive the arc plate 30 to rotate, thereby driving the second arc-shaped claw 50 on the arc plate 30 to move accordingly. When the first arc-shaped claw 40 and the second arc-shaped claw 50 fix the wire, the butterfly bolt 70 can be stopped from rotating, and the position of the second arc-shaped claw 50 can be fixed by the butterfly bolt 70, and the installation of the bypass drainage device can be completed. In this way, the installation speed is fast and the operation is simple. Only one person is needed to install the auxiliary drainage line, and the actual application effect is better.

[0032] like Figure 1-2 As shown, a first arc-shaped portion 11 is provided on the fixing block 10 on the same side as the second arc-shaped portion 12. The space on one side of the first arc-shaped portion 11 is provided for the arc-shaped plate 30 to unfold, so that there is enough space for the first arc-shaped portion 11 to move during the unfolding process. When installing and connecting the bypass drainage device, the user can conveniently clip the first arc-shaped claw 40 and the second arc-shaped claw 50 onto the wire in time, making the installation and connection easier and the actual installation efficiency higher.

[0033] like Figure 1-2As shown, a first fixing tube 20 is fixed to one end of the fixing block 10, and a through hole for the butterfly bolt 70 to pass through is opened in the middle of the first fixing tube 20. A first rotating shaft 21 is rotatably arranged inside the first fixing tube 20, and the butterfly bolt 70 is arranged vertically through the first rotating shaft 21. Through this structural arrangement, the first rotating shaft 21 can be rotated in the first fixing tube 20. When the position of the arc plate 30 is adjusted, the butterfly bolt 70 can be rotated to a suitable position, so that the butterfly bolt 70 has a better limiting effect on the arc plate 30. At the same time, during the process of adjusting the butterfly bolt 70 to the arc plate 30, it will not be blocked by the first fixing tube 20, and the actual application effect is better.

[0034] like Figure 1-2 As shown, a third fixing tube 60 is fixed on the arc plate 30, and a slot is opened in the middle of the third fixing tube 60 for the end of the butterfly bolt 70 to pass through. A third rotating shaft 61 is rotatably arranged inside the third fixing tube 60, and the third rotating shaft 61 and the butterfly bolt 70 are vertically connected. Through this structural arrangement, when the butterfly bolt 70 drives the arc plate 30 to rotate, the butterfly bolt 70 can drive the third rotating shaft 61 located in the third fixing tube 60 to rotate, and the angle of the arc plate 30 can be adjusted over a wide range.

[0035] like Figure 1-2 As shown, a second fixed tube 31 is fixed on one side of the second arc-shaped portion 12 of the fixed block 10, an arc-shaped notch is opened on the second fixed tube 31, a second rotating shaft 32 is arranged inside the second fixed tube 31, and the second rotating shaft 32 is fixedly connected to the arc plate 30 at the position of the arc-shaped notch, so that the arc plate 30 and the fixed block 10 are connected as a whole, so that the arc plate 30 always rotates around the fixed block 10.

[0036] like Figure 1-2 As shown, when the first arc-shaped claw 40 and the second arc-shaped claw 50 clamp the wire;

[0037] First state: the ends of the first arc-shaped claw 40 and the second arc-shaped claw 50 are in the same straight line, and can clamp large-diameter wires;

[0038] Second state: the first arc-shaped claw 40 and the second arc-shaped claw 50 are in a crossed state, and can clamp small-sized wires. The first arc-shaped portion 11, the second arc-shaped portion 12 and the arc-shaped plate 30 have the same arc degree.

[0039] This structural setting can make the application scope wider, and it can be suitable for wires of various sizes to perform bypass drainage operations, and the actual application effect is better.

[0040] like Figure 1-2As shown, a fixing notch 13 for connecting the copper core stranded wire is provided at the bottom of the fixing block 10. The fixing block 10 and the copper core stranded wire are fixedly connected. The right angle of the fixing notch 13 is larger than the diameter of the copper core stranded wire. The two fixing blocks 10 are connected by the copper core stranded wire.

[0041] Current carrying capacity calculation: The existing steel core aluminum stranded wire is heavy, large in size, and inconvenient to carry, so we are looking for a substitute; the current carrying capacity theoretical calculation is performed to verify the current carrying capacity of the soft copper stranded wire.

[0042] There are three mainstream current current carrying capacity calculation methods: table lookup method, IEEE method and Morgan formula method. The table lookup method is the simplest. After limiting the calculation conditions, you can refer to the "Quick Lookup Table of Overhead Line Current Carrying Capacity and Transmission Capacity"; the IEEE method and the Morgan formula method have the same calculation principle, but their calculation formulas are different. The calculation methods are all based on the principle of thermal balance, that is, at the highest allowable operating temperature of the conductor, the heat generated by the conductor is balanced with the heat lost, and the current flowing through the conductor at this time is the allowable current carrying capacity. The source of heat generated by the conductor during operation is the heat generated by the current flowing through the line resistance and sunlight, while the way of heat loss is radiation and convection.

[0043] Because the Morgan formula method is the most widely used and is also the calculation method recommended by GB50545-2010, this article chooses to use the Morgan formula method to calculate the current carrying capacity.

[0044] The current carrying capacity calculation formula is:

[0045]

[0046] W R is the radiation heat dissipation power (W / m), and its value is

[0047]

[0048] D is the wire diameter (m); ε is the wire surface radiation heat dissipation coefficient, which is 0.23-0.43 for bright new wires and 0.9-0.95 for old wires or wires coated with black preservatives; S is the Stefan-Boltzmann constant, 5.67×10-8W / m 2 ; tp is the allowable surface temperature of the conductor (℃); ta is the ambient temperature (℃).

[0049] W F is the convection heat dissipation power (W / m), and its value is

[0050]

[0051] v is the wind speed perpendicular to the conductor (m / s).

[0052] Ws is the solar heat absorption power (W / m), and its value is:

[0053] Ws=αJD

[0054] Where α is the surface heat absorption coefficient of the conductor, which is 0.35-0.46 for bright new wires and 0.9-0.95 for old wires or wires coated with black preservatives; J is the sunlight intensity on the conductor.

[0055] R t is the AC resistance (Ω / m) at the allowable temperature, and its value is:

[0056] R t =kR 20 [1+β(t p -20)]

[0057] R 20 is the DC resistance of the wire at 20℃, α is the resistance temperature coefficient of the wire at 20℃, and β is the AC-DC resistance ratio, which reflects the resistance change caused by eddy current, hysteresis, skin effect and proximity effect. The calculation process is complicated. Due to the influence of skin effect and proximity effect, the AC-DC resistance ratio k of copper wire is usually between 1.0 and 1.1. For simplicity, we can take a typical value k = 1.005.

[0058] In this calculation process, the maximum allowable temperature tp is 80℃, the ambient temperature ta is 40℃, the calculated wind speed v is 0.5m / s, the conductor surface radiation heat dissipation coefficient ε is 0.9, the conductor surface heat absorption coefficient α is 0.9, and the sunlight intensity J on the conductor is 1000W / ㎡ when the sunlight directly shines on the conductor on a sunny day.

[0059] The following table shows the calculated current carrying capacity of soft copper stranded wires with different cross-sectional areas.

[0060]

[0061] Transmission lines of different voltage levels were selected as references. ±1100kV Jiquan Line, the project has a transmission capacity of 12000MV, a rated current of 5455A, a maximum overload current of 6446A (14400MV), and uses 8×JL1 / G3A-1250 / 70 steel core aluminum stranded wire. The current of a single sub-conductor is 681.875A~818.25A, and 315 cross-section soft copper stranded wire can be used instead. ±800kV Jinsu Line, the project has a transmission capacity of 7200MV, a load current of 3500~4500A, and uses 6×

[0062] JL / G3A-900 / 40 steel core aluminum stranded wire, a single sub-conductor carries a current of 583.3333333A~750A, and can be replaced by 250 or 315 cross-section soft copper stranded wire. ±500kV Genan / Linfeng line, the project has a transmission capacity of 3000MV and a rated current of 3000A, using 4×ACSR-720 / 50 steel core aluminum stranded wire, a single sub-conductor carries a current of 750A, and can be replaced by 250 cross-section soft copper stranded wire.

[0063] Assuming that the length of the drainage line is 2 meters, the following weight comparison table can be obtained.

[0064] Steel core aluminum stranded wire model Weight(kg) Cross-sectional area of ​​soft copper stranded wire Weight(kg) JL1 / G3A-1250 / 70 8.0222 315 5.908 JL / G3A-900 / 40 5.5804 250 4.794 ACSR-720 / 50 4.7954 250 4.794

[0065] As can be seen from the above figure, the weight of soft copper stranded wire as drainage wire is lighter than that of steel core aluminum stranded wire. Moreover, because the small cross-section soft copper stranded wire has a strong current carrying capacity, the outstanding advantage of using soft copper stranded wire as drainage wire is its small size, light weight and easy to carry. When working under the scorching sun, it can greatly reduce the physical exertion of the operators.

[0066] The technical scope of the present invention is not limited to the contents in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A universal bypass drainage device, characterized in that: The invention comprises two fixed blocks (10) connected by copper core twisted wires, a first arc-shaped claw (40) and a second arc-shaped claw (50), wherein one side of the fixed block (10) is provided with a second arc-shaped portion (12) for arranging the electric wire, the first arc-shaped claw (40) is fixed on one side of the second arc-shaped portion (12) on the fixed block (10), an arc-shaped plate (30) is rotatably arranged on the other side of the second arc-shaped portion (12) on the fixed block (10), the second arc-shaped claw (50) is fixed on the arc-shaped plate (30), the first arc-shaped claw (40) and the second arc-shaped claw (50) are staggered, and a butterfly bolt (70) is passed through one end of the fixed block (10), and the end of the butterfly bolt (70) is rotatably connected to the arc-shaped plate (30).

2. A universal bypass drainage device according to claim 1, characterized in that: The fixing block (10) is provided with a first arc-shaped portion (11) on the same side as the second arc-shaped portion (12), and a space on one side of the first arc-shaped portion (11) is provided for the arc-shaped plate (30) to unfold.

3. A universal bypass drainage device according to claim 2, characterized in that: A first fixing tube (20) is fixed to one end of the fixing block (10), a through hole for a butterfly bolt (70) to pass through is provided in the middle of the first fixing tube (20), a first rotating shaft (21) is rotatably arranged inside the first fixing tube (20), and the butterfly bolt (70) is arranged to pass through the first rotating shaft (21) vertically.

4. A universal bypass drainage device according to claim 3, characterized in that: A third fixing tube (60) is fixed on the arc plate (30), a slot is provided in the middle of the third fixing tube (60) for the end of the butterfly bolt (70) to pass through, a third rotating shaft (61) is rotatably arranged inside the third fixing tube (60), and the third rotating shaft (61) and the butterfly bolt (70) are vertically connected.

5. A universal bypass drainage device according to claim 4, characterized in that: A second fixed tube (31) is fixed on the fixed block (10) at one side of the second arc-shaped portion (12); an arc-shaped notch is provided on the second fixed tube (31); a second rotating shaft (32) is provided inside the second fixed tube (31); and the second rotating shaft (32) is fixedly connected to the arc-shaped plate (30) at the position of the arc-shaped notch.

6. A universal bypass drainage device according to claim 5, characterized in that: When the first arc-shaped claw (40) and the second arc-shaped claw (50) clamp the electric wire; First state: the ends of the first arc-shaped claw (40) and the second arc-shaped claw (50) are in a straight line state; Second state: the first arc-shaped claw (40) and the second arc-shaped claw (50) are in a crossed state.

7. A universal bypass drainage device according to claim 5, characterized in that: A fixing notch (13) for connecting the copper core stranded wire is provided at the bottom of the fixing block (10), the fixing block (10) and the copper core stranded wire are fixedly connected, and the fixing notch (13) has a right angle greater than the diameter of the copper core stranded wire.

8. A universal bypass drainage device according to claim 5, characterized in that: The first arc-shaped portion (11), the second arc-shaped portion (12) and the arc-shaped plate (30) have the same arc angle.

Images