New energy storage power station grounding downlead system construction method

Abstract

The invention relates to a construction method for a grounding down lead system of a new energy storage power station, which is based on the construction of a main grounding grid and is used for reasonably connecting a lightning rod, a framework, a lightning arrester bracket, a main transformer, a tubular bus, a GIS (Gas Insulated Switchgear) and a brim voltage-sharing belt in the energy storage power station with the main grounding grid so as to exert the function of protecting related electrical equipment in the energy storage power station. Comprising the following steps that S1, a lightning rod, a framework, a lightning arrester support, a main transformer, a tubular bus, a GIS and a brim voltage-sharing belt are connected to a main grounding grid; s2, providing centralized grounding devices, and respectively arranging the centralized grounding devices at positions adjacent to a lightning rod, a main transformer and a tubular bus; on the basis that related electrical equipment of the energy storage power station is connected to the main grounding grid, the centralized grounding device is arranged for the lightning rod, the main transformer and the tubular bus, so that the current dispersing area is increased, the grounding efficiency of a grounding down lead system of the energy storage power station is improved, the potential difference among multiple equipment of the energy storage power station is reduced, and point position balance of the whole station is ensured; and safe operation of electrical equipment is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage power station construction, and in particular to a construction method for a grounding down conductor system of a new energy energy storage power station. Background Art

[0002] With the increasing number of new energy photovoltaic power generation, wind power generation and other forms of power stations, the electricity generated by them is connected to the power grid, but sometimes it cannot be consumed in time, wasting wind power and photovoltaic resources; in particular, electricity consumption is regional and periodic; the rise of new energy storage power stations perfectly solves the storage and supply of electricity, shaving peaks and filling valleys, and balancing the power grid.

[0003] In energy storage power stations, the main grounding grid is the core infrastructure for ensuring the safe and stable operation of the power system. Its importance is mainly reflected in the following aspects: First, the main grounding grid quickly conducts fault current, lightning current, and electrostatic charge into the earth through a low-impedance path, effectively avoiding equipment insulation breakdown and the risk of electric shock to personnel, ensuring the safety of both personnel and equipment. Second, a complete grounding system can balance the potential distribution across the entire station, preventing potential differences between equipment caused by local potential rises, thereby reducing electromagnetic interference on the signals of precision control equipment such as the battery management system (BMS) and energy management system (EMS), ensuring the reliability of the system's monitoring and control functions. In addition, in response to the high DC side voltage characteristics unique to energy storage power stations, the main grounding grid can suppress the generation of DC arcs and reduce the risk of fire. Under abnormal grid operating conditions, the main grounding grid also provides an accurate fault current path for protection devices, ensuring that relay protection operates quickly and accurately to prevent accidents from escalating.

[0004] The degree to which the main grounding grid functions is realized depends on the reasonable distribution and connection between the electrical equipment of the energy storage power station and the main grounding grid. Currently, there is no specific grounding down conductor system to ensure that the main grounding grid can serve as the cornerstone for the safe operation of electrical equipment in the energy storage power station. Therefore, a new energy storage power station grounding down conductor system is proposed to ensure the safe and stable operation of electrical equipment in the energy storage power station site. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a construction method for a grounding down conductor system of a new energy storage power station, so as to solve the problem that the prior art energy storage power station has no systematic grounding method to ensure the safe operation of electrical equipment.

[0006] To achieve the above objectives, the present invention provides a method for constructing a grounding down conductor system for a new energy storage power station. Based on the construction of a main grounding grid, the method is used to rationally connect the lightning rod, frame, arrester bracket, main transformer, pipe busbar, GIS, and cap eaves grading strip in the energy storage power station to the main grounding grid to maximize the function of protecting related electrical equipment in the energy storage power station. The method is characterized by comprising the following steps:

[0007] S1. Connect the lightning rod, frame, arrester bracket, main transformer, pipe mother, GIS and cap grading belt to the main grounding grid;

[0008] S2. Provide centralized grounding devices, which should be installed near the lightning rod, main transformer and pipe mother.

[0009] S3. Then connect the lightning rod, main transformer and pipe mother to the adjacent centralized grounding device respectively.

[0010] By adopting this technical solution, on the basis of connecting the main electrical equipment of the energy storage power station to the main grounding grid, centralized grounding devices are installed for lightning rods, main transformers and pipe mothers where more current is generated. This increases the dispersion area, thereby increasing the grounding efficiency of the energy storage power station grounding down conductor system, and reducing the potential difference between multiple devices in the energy storage power station, ensuring the balance of the entire site, preventing equipment damage and malfunction due to potential differences, and thus ensuring the safe operation of electrical equipment.

[0011] Furthermore, in step S1, the connection between the lightning rod, frame, lightning arrester bracket, main transformer, pipe mother, GIS and brim equalizing belt and the main grounding grid is completed through the cooperation of flat iron and vertical grounding body, wherein the vertical grounding body is angle steel, and the single-sided width is the same as the flat iron width. The connection parts formed are overlapped and fully welded using connectors formed by bending flat iron.

[0012] By adopting this technical solution, it is possible to avoid the potential difference between two adjacent flat irons, which would cause circulating current and affect the grounding effect.

[0013] Furthermore, the overlap lengths between the connector and the flat iron, the vertical grounding body, and the main grounding grid are all twice the width of the flat iron.

[0014] By adopting this technical solution, it is ensured that no loop current or concentrated load is generated during the arrival process. Fault current, lightning current and electrostatic charge can be quickly conducted into the ground, effectively avoiding equipment insulation breakdown and the risk of electric shock to personnel, and ensuring the safety of personnel and equipment.

[0015] Furthermore, the centralized grounding device in step S2 is composed of three angle steels arranged in a triangle and connected by a horizontal grounding body;

[0016] When setting up a centralized grounding device, the horizontal grounding electrode should be buried underground.

[0017] By adopting this technical solution, a centralized grounding device consisting of three angle steels and a horizontal grounding body forms a grounding structure outside the main grounding grid to increase the dispersion area and achieve the purpose of increasing grounding efficiency.

[0018] Furthermore, in step S1 , multiple connection points between the frame and the main grounding grid are provided along the plane coverage of the frame itself to ensure reliable connection between the frame and the main grounding grid.

[0019] By adopting this technical solution, the grounding stability of the structure is guaranteed.

[0020] Furthermore, in step S1, the arrester bracket should be connected to two different vertical grounding electrodes, and connected to different positions of the main grounding grid through the two different vertical grounding electrodes.

[0021] By adopting this technical solution, the grounding efficiency of the lightning arrester bracket is increased.

[0022] Furthermore, the main transformer connected to the main grounding grid in step S1 includes the foundation embedded parts, the main transformer core, the clamps, the main transformer body, the neutral point complete device and the main transformer terminal box being connected to the main grounding grid respectively;

[0023] Connecting the main transformer to the adjacent centralized grounding device in step S3 means connecting the neutral point complete set to the adjacent centralized grounding device and performing grounding through the centralized grounding device.

[0024] By adopting this technical solution, different grounding methods are selected according to the different structural compositions of the main transformer to ensure the grounding effect and efficiency of the entire main transformer.

[0025] Furthermore, the connection of the busbar to the main grounding grid in step S1 includes connecting the busbar bridge support to the main grounding grid and grounding through the main grounding grid;

[0026] Connecting the busbar to the adjacent centralized grounding device in step S3 refers to connecting the busbar bridge support to the adjacent centralized grounding device and grounding the busbar through the centralized grounding device.

[0027] By adopting this technical solution, the pipe mother is connected to the main grounding grid and the centralized grounding device respectively to increase the grounding diffusion area, thereby increasing the grounding efficiency of the pipe mother.

[0028] Furthermore, the GIS in step S1 is connected to the main grounding grid in the form of dual grounding on both sides of the main grounding grid, and the dual grounding on both sides is connected to different sides of the main grounding grid.

[0029] By adopting this technical solution, the GIS is included in different main grounding grids to increase the grounding diffusion area of ​​the GIS, thereby increasing the grounding efficiency of the GIS.

[0030] Furthermore, the hat brim pressure equalizing belt in step S1 is composed of two flat irons horizontally connected to the main grounding grid.

[0031] By adopting this technical solution, the point distribution is optimized, the risks of step voltage and contact voltage are reduced, and the risk of electric shock to personnel is minimized through local point balancing and gradient control.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. On the basis of connecting the main electrical equipment of the energy storage power station to the main grounding grid, centralized grounding devices are installed for lightning rods, main transformers and pipe mothers where more current is generated to increase the dispersion area, thereby increasing the grounding efficiency of the energy storage power station grounding down conductor system and reducing the potential difference between multiple devices in the energy storage power station to ensure the balance of the entire site and prevent equipment damage and malfunction due to potential difference.

[0034] 2. The flat iron bending method is adopted to ensure that the overlapping area of ​​the flat iron at the connection parts is twice the width of the flat iron for various forms of horizontal and vertical connection parts. The overlapping parts are fully welded to ensure that no loop current and no concentrated load are generated during the connection process. The fault current, lightning current and electrostatic charge can be quickly conducted into the ground, effectively avoiding the risk of equipment insulation breakdown and electric shock to personnel, and ensuring the safety of personnel and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the ground plane effect of the energy storage power station;

[0036] Figure 2 This is the effect diagram of the centralized grounding device;

[0037] Figure 3 This is a partial enlarged effect diagram of the lightning rod grounding;

[0038] Figure 4 This is a partial enlarged rendering of the lightning rod installed on the grounding of the structure;

[0039] Figure 5 This is a partial enlarged rendering of the structure grounding;

[0040] Figure 6 This is a partial enlarged rendering of the arrester bracket grounding;

[0041] Figure 7 This is a partial enlarged effect diagram of the main transformer grounding;

[0042] Figure 8 This is a partial enlarged effect diagram of the busbar grounding;

[0043] Figure 9 This is a partial enlarged rendering of the GIS grounding;

[0044] Figure 10 This is a partial enlarged effect diagram of the grounding of the brim voltage-equalizing belt;

[0045] Figure 11 This is the effect diagram of flat iron T-joint connection;

[0046] Figure 12 This is the effect diagram of flat irons connected vertically;

[0047] Figure 13 This is the effect diagram of the connection between the vertical grounding body and the flat iron;

[0048] Figure 14 This is the connection effect diagram of the box grounding and the grounding down conductor;

[0049] Figure 15 This is the GIS grounding connection effect diagram. DETAILED DESCRIPTION

[0050] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0051] Please see the attached Figure 1 The schematic diagram of the grounding plane effect of the energy storage power station shown in the figure shows a method for constructing a grounding down conductor system for a new energy storage power station. The method is applicable to the grounding devices of various locations and equipment in the energy storage power station, including the grounding settings of lightning rods, frames, lightning rod brackets, main transformers, pipe mothers, GIS, and cap eaves grading strips. The horizontal grounding electrode is made of hot-dip galvanized flat steel with a burial depth of not less than 0.8m, and the vertical grounding electrode is made of angle steel. Conventional angle steel vertical grounding electrodes are the same as those in the prior art and will not be elaborated on here. Based on this, the method includes:

[0052] Provide centralized grounding device:

[0053] Please refer to the attached Figure 2 As shown in the rendering of the centralized grounding device, it consists of three angle steels arranged in a triangle, with the spacing between adjacent angle steels greater than 5m, and connected by horizontal grounding bodies. The vertical grounding bodies in the figure are angle steels;

[0054] Grounding setting of lightning rod:

[0055] Please refer to the attached Figure 3 As shown in the partial enlarged effect diagram of lightning rod grounding, in addition to being connected to the main grounding grid through flat steel and vertical grounding electrodes, it is also connected to the centralized grounding device;

[0056] Please refer to the attached Figure 4 As shown in the enlarged rendering of the lightning rod installed on the structure grounding, if the lightning rod is not installed separately, such as if the lightning rod is installed on the structure, in this case, three horizontal grounding electrodes need to be installed on the main grounding network of the structure down conductor and connected to the centralized grounding device.

[0057] Grounding settings of the frame:

[0058] Please refer to the attached Figure 5As shown in the partial enlarged rendering of the frame grounding, the frame should be reliably connected to the main grounding grid at eight locations, represented by numbers 1-8 in the figure.

[0059] Grounding setting of lightning arrester bracket:

[0060] Please refer to the attached Figure 6 As shown in the partial enlarged effect diagram of the lightning arrester bracket grounding, the outdoor open lightning arrester bracket is reliably connected to two different vertical grounding electrodes.

[0061] Grounding settings of main transformer:

[0062] Please refer to the attached Figure 7 As shown in the partial enlarged effect diagram of the main transformer grounding, the embedded parts of the main transformer foundation are grounded, see Note 3; the main transformer core and clamps are grounded separately, a total of two places, see Note 4; the main transformer body is grounded, a total of two places, see Note 5; the neutral point complete set is grounded, double grounding, one side is led to the main grounding grid, and the other side is led to the centralized grounding device, see Note 6; the main transformer terminal box is grounded, double grounding, see Note 7.

[0063] Grounding setting of pipe mother:

[0064] Please refer to the attached Figure 8 As shown in the partial enlarged effect diagram of busbar grounding, the busbar bridge bracket with lightning arrester is grounded, one side is led to the main grounding grid, and the other side is led to the centralized grounding device, a total of two places, see Note 10; the busbar bridge bracket without lightning arrester is grounded, and is led to different sides of the main grounding grid, a total of two places, see Note 12.

[0065] GIS grounding settings:

[0066] Please refer to the attached Figure 9 As shown in the partial enlarged effect diagram of GIS grounding, GIS equipment has dedicated grounding points and double grounding. There are 14 grounding points in total, which are connected to different sides of the main grounding grid. See Note 9.

[0067] Grounding setting of the brim voltage equalizing belt:

[0068] Please refer to the attached Figure 10 As shown in the partially enlarged rendering of the brim voltage-equalizing belt grounding, a brim voltage-equalizing belt is laid at the station exit. In the main grounding grid of the entire energy storage power station, the main purpose of setting the brim voltage-equalizing belt at the gate is to optimize the potential distribution, reduce the risk of step voltage and contact voltage, and minimize the risk of electric shock to personnel through local potential equalization and gradient control. At the same time, the safety redundancy of the grounding system in special scenarios is enhanced, thereby ensuring the safety of personnel and stable operation of equipment.

[0069] It should be noted that the grounding down conductor system of the energy storage power station includes but is not limited to the grounding of lightning rods, frames, lightning arrester brackets, main transformers, pipe mothers, GIS, and cap eaves equalizing strips. The grounding methods of other electrical equipment are the same as those of the above electrical equipment and are grounded using the same connection standards. There are five types of grounding that can be adapted to different conditions on site: flat iron T-connection, flat iron vertical connection, vertical grounding body and flat iron connection, box grounding and grounding down conductor connection, and GIS grounding connection. All of them use bent flat iron to complete the corresponding grounding. Specifically, flat iron T-connection is shown in the attached figure. Figure 11 Flat iron T-joint connection effect diagram is shown; Flat iron vertical connection is shown in the attached Figure 12 The flat iron is connected vertically as shown in the figure; the vertical grounding body is connected to the flat iron as shown in the attached figure. Figure 13 The effect diagram of the vertical grounding body and the flat iron connection is shown in the figure; the connection diagram of the box grounding and the grounding down conductor is attached. Figure 14 The box grounding and grounding down conductor connection effect diagram is shown in the figure; GIS grounding connection is as shown in the attached figure. Figure 15 The GIS grounding connection effect is shown in the figure.

[0070] The present invention has been described in detail above with reference to the embodiments of the accompanying drawings. A person skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. A method for constructing a grounding down conductor system for a new energy storage power station, based on the construction of a main grounding grid, is used to rationally connect the lightning rod, frame, arrester bracket, main transformer, pipe mother, GIS, and cap eaves grading belt in the energy storage power station to the main grounding grid to play the role of protecting related electrical equipment in the energy storage power station; characterized by: The steps include: S1. Connect the lightning rod, frame, arrester bracket, main transformer, pipe mother, GIS and cap grading belt to the main grounding grid; S2. Provide centralized grounding devices, which should be installed near the lightning rod, main transformer and pipe mother. S3. Then connect the lightning rod, main transformer and pipe mother to the adjacent centralized grounding device respectively.

2. The method for constructing a grounding down conductor system for a new energy storage power station according to claim 1, wherein: In step S1, the connection between the lightning rod, frame, lightning arrester bracket, main transformer, pipe mother, GIS and brim equalizing belt and the main grounding grid is completed through the cooperation of flat iron and vertical grounding body, among which the vertical grounding body is angle steel, and the single-side width is the same as the flat iron width. The connection parts formed are overlapped and fully welded using connectors formed by bending flat iron.

3. The method for constructing a grounding down conductor system for a new energy storage power station according to claim 2, wherein: The overlap length between the connector and the flat iron, vertical grounding body and main grounding grid is twice the width of the flat iron.

4. The method for constructing a grounding down conductor system for a new energy storage power station according to claim 2, wherein: The centralized grounding device in step S2 is composed of three angle steels arranged in a triangle and connected by a horizontal grounding body; When setting up a centralized grounding device, the horizontal grounding electrode should be buried underground.

5. The method for constructing a grounding down conductor system for a new energy storage power station according to claim 2, wherein: In step S1 , the connection points between the frame and the main grounding grid are arranged at multiple locations along the plane coverage of the frame itself to ensure reliable connection between the frame and the main grounding grid.

6. The method for constructing a grounding down conductor system for a new energy storage power station according to claim 2, wherein: In step S1, the lightning arrester bracket should be connected to two different vertical grounding electrodes, and connected to different positions of the main grounding grid through the two different vertical grounding electrodes.

7. The method for constructing a grounding down conductor system for a new energy storage power station according to claim 2, wherein: The main transformer is connected to the main grounding grid in step S1, including the foundation embedded parts, the main transformer core, the clamps, the main transformer body, the neutral point complete set and the main transformer terminal box are connected to the main grounding grid respectively; Connecting the main transformer to the adjacent centralized grounding device in step S3 means connecting the neutral point complete set to the adjacent centralized grounding device and performing grounding through the centralized grounding device.

8. The method for constructing a grounding down conductor system for a new energy storage power station according to claim 2, wherein: Connecting the busbar to the main grounding grid in step S1 includes connecting the busbar bridge support to the main grounding grid and grounding through the main grounding grid; Connecting the busbar to the adjacent centralized grounding device in step S3 refers to connecting the busbar bridge support to the adjacent centralized grounding device and grounding the busbar through the centralized grounding device.

9. The method for constructing a grounding down conductor system for a new energy storage power station according to claim 2, characterized in that: The GIS in step S1 is connected to the main grounding grid in the form of dual grounding on both sides of the main grounding grid, and the dual grounding on both sides is connected to different sides of the main grounding grid.

10. The method for constructing a grounding down conductor system for a new energy storage power station according to claim 1, characterized in that: The hat brim voltage equalizing belt in step S1 is composed of two flat irons horizontally connected to the main grounding grid.

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