Bird damage prevention power capacitor bank for power transmission project

Abstract

The utility model belongs to the field of power capacitor equipment in power transmission engineering, and particularly relates to a bird damage prevention power capacitor bank for power transmission engineering, which comprises a plurality of capacitor racks stacked up and down, and each capacitor rack comprises a capacitor unit group and an interlayer post insulator. The capacitor unit group comprises a profile steel frame, a plurality of capacitor units and a protection plate, the profile steel frame is of a cubic frame structure, the capacitor units are horizontally arranged side by side and are fixedly arranged in the profile steel frame, wiring terminals of the capacitor units face outwards, and the protection plate is a thin plate of which the plate surface is coated with insulating paint. The protection plate covers and is fixed on the top surface and / or the bottom surface of the profile steel frame, and the interlayer post insulator is connected with the profile steel frame. According to the power capacitor bank, flying birds move between layers, short circuit between the upper layer rack and the lower layer rack cannot be caused, and the power capacitor bank is easy and convenient to install and maintain, high in reliability, low in cost and environmentally friendly.

Description

Technical Field

[0001] The utility model belongs to the field of power capacitor equipment in power transmission projects, in particular to a bird-damage-proof power capacitor group used in power transmission projects. Background Art

[0002] At present, there are many ultra-high / ultra-high voltage AC and DC transmission projects under construction and in operation in my country. In order to provide reactive power compensation, filter out specific harmonics, enhance system stability, reduce grid losses and improve voltage quality, a large number of power capacitor devices need to be installed in converter stations and substations. Due to the large number of layers and electrical connection points of power capacitor devices, and the different potentials of different electrical connection points, when there are foreign objects (usually birds), short-circuit discharge will occur, causing the protection device to trip and causing the power capacitor device to fail and exit operation. Operation experience shows that the bird damage problem has seriously affected the safe operation of power capacitor devices and has always been a pain point in the operation of converter stations and substations. The problem of bird damage prevention for power capacitor devices needs to be solved urgently.

[0003] At present, the bird-proof measures taken on power capacitor devices are as follows: 1. Tinned copper stranded wire with insulating jacket is used for the connecting wire inside the power capacitor device; 2. Bird-proof caps are installed on the capacitor terminals; 3. The clear distance between capacitor layers is increased; 4. Anti-bird-proof insulating coating (fluorosilicone rubber) is sprayed between capacitor layers (capacitor unit and frame surface). Among them, the first and second measures have solved the bird-proof problem between the capacitor terminals and between the terminals and the shell, but cannot solve the problem of bird-proof between capacitor layers. For the third measure, the existing technical solution is that the interlayer support insulator and the two sides of the capacitor will occupy the interlayer clear distance, so it is necessary to increase the height of the interlayer support insulator, but this will reduce the critical load of the interlayer support insulator, affect the overall seismic performance of the capacitor device, and increase the cost of the capacitor device. In addition, due to the height restrictions of the converter station and substation, the clear distance between the capacitor layers is relatively limited after the increase, and it cannot fundamentally eliminate the problem of preventing various bird damage between the capacitor layers. Regarding the fourth measure, although some capacitor manufacturers have conducted thermal stability tests on capacitor units sprayed with bird-proof insulating coating (fluorosilicone rubber), and the test results show that they are qualified, they are only the test results of a few capacitor units sampled in the laboratory in a short period of time, which are not universal and have no technical support from relevant national standards. For ultra-high / ultra-high voltage AC and DC transmission projects, there are tens of thousands of capacitor units, dozens of models, and complex operating conditions. If the bird-proof insulating coating (fluorosilicone rubber) is directly sprayed on the capacitor units, it will have a great impact on the heat dissipation, insulation aging, and service life of the capacitor units, and the operating risk is relatively large. In addition, the replacement and maintenance of capacitor units and the re-spraying of bird-proof insulating coating on capacitor towers in the later stage are complicated and difficult to implement, with a huge workload and are very environmentally unfriendly. The capacitor layers cannot achieve long-term and effective bird-proof effects. Utility Model Content

[0004] The utility model aims to provide a bird-proof power capacitor bank for power transmission projects which has the advantages of simple structure, convenient installation and maintenance and good bird-proof effect.

[0005] The technical solution for achieving the above-mentioned purpose includes the following contents.

[0006] A bird-damage-proof power capacitor group for power transmission projects comprises a plurality of capacitor racks stacked up and down, the capacitor racks comprising a capacitor unit group and interlayer support insulators, the capacitor unit group comprising a steel frame, a plurality of capacitor units and a protective plate, the steel frame being a cubic frame structure, the capacitor units lying side by side and being fastened in the steel frame, the capacitor unit terminals facing outward, the protective plate being a thin plate with an insulating coating sprayed on the plate surface, the protective plate covering and being fixed on the top surface and / or the bottom surface of the steel frame, and the interlayer support insulators being connected to the steel frame.

[0007] Furthermore, the steel frame is assembled by welding angle steels.

[0008] Furthermore, the top surface of the protective plate fixed on the top surface of the steel frame is sprayed with insulating paint, the bottom surface of the protective plate fixed on the bottom surface of the steel frame is sprayed with insulating paint, and the surface in contact with the steel frame is not sprayed with insulating paint, which can ensure that the potential of the protective plate and the steel frame is equal, avoiding the occurrence of floating potential.

[0009] Furthermore, the capacitor unit is fastened to the steel frame by bolts.

[0010] Furthermore, the insulating coating is fluorosilicone rubber.

[0011] Furthermore, the plate surface of the protective plate is provided with strip-shaped triangular protrusions at intervals, so that triangular gaps are formed between the plate surface and the steel frame, which facilitates the heat dissipation of the capacitor unit during energized operation; and enhances the mechanical strength of the protective plate to prevent deformation, wind shaking and resonance noise.

[0012] Furthermore, the protective plate fixed on the bottom or top surface of the steel frame is composed of a plurality of shielding capacitor units and a plate surface of the steel frame material. Holes are left at positions that do not need to be shielded, which is conducive to heat dissipation.

[0013] Furthermore, the protective plate is a galvanized steel plate or a stainless steel plate with a thickness of 1.5 mm to 2 mm. The plate with appropriate thickness is light in weight, light in load, and can be repeatedly disassembled and assembled.

[0014] Furthermore, the protective plate is installed and fixed on the steel frame by using blind rivets.

[0015] Furthermore, each capacitor stand is provided with two capacitor unit groups which are horizontally arranged in parallel and connected.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The bird-proof insulating coating (fluorosilicone rubber) is sprayed on the protective plate, which is installed on the top and / or bottom of the steel frame. It does not contact the capacitor unit and does not affect the installation of the capacitor unit and the heat dissipation during energized operation.

[0018] If the protective plate is made of other insulating materials such as epoxy resin plates, there are insurmountable disadvantages such as short service life, easy aging and cracking, and cannot be repeatedly disassembled and assembled. This solution uses 1.5mm~2mm thick galvanized steel plate or stainless steel plate, which is not only light in weight, but also will not add excessive load to the capacitor bank after installation. It is easy to spray insulating paint, has good coverage, and has a long service life and can be repeatedly disassembled and assembled.

[0019] The protective plate is assembled and easy to install and disassemble. It can be centrally processed and produced in the factory. There is no need to spray paint on site in the converter station and substation. It is environmentally friendly, has high production and processing efficiency and low cost.

[0020] 4. The protective plate surface is provided with a plurality of strip-shaped triangular protrusions, which not only provide a heat dissipation channel for the capacitor unit, but also enhance the mechanical strength of the protective plate.

[0021] 5. The insulation range of the protective plate can be set according to the capacitor bank. The insulation bird-proof range is large and safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of a capacitor unit group in an embodiment;

[0023] Figure 2 A schematic diagram of a steel frame structure of an embodiment;

[0024] Figure 3 A schematic diagram of the structure of the protective plate of an embodiment;

[0025] Figure 4 It is a schematic diagram of the partial structure of the bird damage protection power capacitor bank of the embodiment.

[0026] In the figure, 1. steel frame; 2. capacitor unit; 3. protective plate; 3-1. triangular protrusion; 4. interlayer support insulator. DETAILED DESCRIPTION

[0027] The present invention is described in detail below with reference to the embodiments.

[0028] See also Figures 1 to 4A bird-damage-proof power capacitor bank for power transmission engineering comprises a plurality of stacked capacitor racks, the capacitor racks comprising a capacitor unit group and an interlayer support insulator 4, the capacitor unit group comprising a steel frame 1, six capacitor units 2 and a protective plate 3, the steel frame 1 is a cubic frame structure assembled by welding angle steels, the six capacitor units 2 are arranged side by side and fastened in the steel frame 1 by bolts, the capacitor unit 2 terminals face outward, the protective plate 3 is a 1.5mm~2mm thick galvanized steel plate, the plate surface is provided with strip-shaped triangular protrusions 3-1 at intervals, the triangular protrusions 3-1 are 20mm~25mm high, and the distance between adjacent triangular protrusions 3-1 is 100 mm~200mm; the protective plate 3 is installed and fixed on the top and bottom surfaces of the steel frame 1 by means of blind rivets. The protective plate 3 is composed of a plurality of plate surfaces and is used to shield the capacitor unit 2 and the angle steel. The top surface of the protective plate 3 fixed on the top surface of the steel frame 1 is sprayed with insulating paint, and the bottom surface of the protective plate 3 fixed on the bottom surface of the steel frame 1 is sprayed with insulating paint, and the insulating paint is fluorosilicone rubber; the interlayer support insulator 4 is connected to the upper and lower four corners of the steel frame 1. In the bird-proof power capacitor group of this embodiment, each capacitor rack is provided with two capacitor unit groups horizontally parallel and connected, and two stacked capacitor racks are provided, and the capacitor racks are connected by six interlayer support insulators 4.

[0029] In the bird-proof power capacitor bank of this embodiment, the protective plate 3 leaves holes at positions where no shielding is required, which is beneficial to heat dissipation. At the same time, the capacitor unit 2 and the steel frame 1 that need to be insulated are shielded. Flying birds move between layers without causing short circuits between the upper and lower platforms. The surface of the protective plate 3 is provided with strip-shaped triangular protrusions 3-1, which is beneficial to heat dissipation of the surface and enhances the strength of the protective plate 3. The protective plate 3 is installed without contacting the capacitor unit 2, and does not affect the heat dissipation of the capacitor unit 2 when it is energized. The installation and maintenance are simple and convenient, the reliability is high, the cost is low, and it is green and environmentally friendly.

[0030] The above embodiments are only specific examples for further illustrating the purpose, technical scheme and beneficial effects of the utility model, and the utility model is not limited thereto. Any modification, equivalent replacement, improvement, etc. made within the scope of the disclosure of the utility model are included in the protection scope of the utility model.

Claims

1. A bird-proof power capacitor bank for power transmission engineering, comprising a plurality of capacitor racks stacked on top and bottom, wherein the capacitor racks comprise a capacitor unit group and interlayer support insulators, characterized in that: The capacitor unit group includes a steel frame, multiple capacitor units and a protective plate. The steel frame is a cubic frame structure. The capacitor units are arranged side by side and are firmly installed in the steel frame, with the capacitor unit terminals facing outward. The protective plate is a thin plate with an insulating paint sprayed on the plate surface. The protective plate covers and is fixed on the top and / or bottom surface of the steel frame. The interlayer support insulator is connected to the steel frame.

2. The bird damage prevention power capacitor bank for power transmission engineering according to claim 1, characterized in that: The steel frame is assembled by welding angle steels.

3. The bird damage prevention power capacitor bank for power transmission engineering according to claim 1, characterized in that: The top surface of the protective plate fixed on the top surface of the steel frame is sprayed with insulating paint, and the bottom surface of the protective plate fixed on the bottom surface of the steel frame is sprayed with insulating paint.

4. The bird damage prevention power capacitor bank for power transmission engineering according to claim 1, characterized in that: The capacitor unit is fastened to the steel frame by bolts.

5. The bird damage prevention power capacitor bank for power transmission engineering according to claim 1, characterized in that: The insulating coating is fluorosilicone rubber.

6. The bird damage prevention power capacitor bank for power transmission engineering according to claim 1, characterized in that: The plate surface of the protective plate is provided with strip-shaped triangular protrusions at intervals.

7. The bird damage prevention power capacitor bank for power transmission engineering according to claim 1, characterized in that: The protective plate fixed on the bottom surface or the top surface of the steel frame is composed of a plurality of shielding capacitor units and a plate surface of the steel frame material.

8. The bird damage prevention power capacitor bank for power transmission engineering according to claim 1, characterized in that: The protective plate is a galvanized steel plate or a stainless steel plate with a thickness of 1.5 mm to 2 mm.

9. The bird damage prevention power capacitor bank for power transmission engineering according to claim 1, characterized in that: The protective plate is installed and fixed on the steel frame by using blind rivets.

10. The bird damage prevention power capacitor bank for power transmission engineering according to claim 1, characterized in that: Each capacitor stand is provided with two capacitor unit groups which are horizontally arranged in parallel and connected.

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