CN108390348A - The lightning protection device of tower crane before hydroelectric dam - Google Patents

Abstract

The invention discloses a kind of lightning protection devices of tower crane before hydroelectric dam; it includes direct lighting stroke protective device and the secondary lightning protection device of control system; the direct lighting stroke protective device includes 4 contour lightning rods for being set to tower crane surrounding, and 4 lightning rods are in a center of symmetry with the tower crane；The secondary lightning protection device of control system includes：It is set to the low three phase mains surge protecting box at cabinet, the three phase mains surge protection module being set at frequency conversion tank, the DC power supply surge protector and AC power surge protector being set at middle control cabinet.Large-scale tower crane is by lightning stroke before solving the problems, such as hydroelectric dam, it is therefore prevented that lightning stroke improves tower crane reliability of operation to the damage of the mechanically and electrically system of large-scale tower crane before hydroelectric dam and to the injury of personnel.

Description

Lightning protection device for tower crane in front of dam of hydropower station

technical field

The invention relates to the technical field of lightning protection protection for hydropower stations, in particular to a lightning protection protection for a large tower crane in front of a hydropower station dam and secondary lightning protection for a control system thereof.

Background technique

On construction sites such as hydropower stations, large tower cranes are usually located at the highest point of all construction equipment and hydraulic structures, so they are vulnerable to lightning strikes. Domestic Goupitan, Jinping, Xiluodu, Xiangjiaba, Dagangshan, etc. The large-scale tower cranes at the construction site of the hydropower station have been struck by lightning many times, resulting in damage to electrical, communication and control system equipment, which caused the shutdown of the tower crane and affected the construction, and also caused personal injury to the tower crane operator. In order to prevent lightning damage to the mechanical and electrical systems of the large-scale tower crane in front of the hydropower station dam, as well as the injury to personnel, and improve the reliability of the operation of the tower crane, a lightning protection method for the large-scale tower crane in front of the hydropower station dam is needed. At present, there are few studies on lightning protection of large tower cranes in front of hydropower dams, and the methods are not perfect.

Contents of the invention

The invention overcomes the shortcomings of the prior art and provides a lightning protection device for a tower crane in front of a dam of a hydropower station with lightning protection effect.

Considering the above-mentioned problems of the prior art, according to one aspect disclosed by the present invention, the present invention adopts the following technical solutions:

A lightning protection device for a tower crane in front of a hydropower station dam, which includes a direct lightning protection device and a secondary lightning protection device for a control system. The direct lightning protection device includes four lightning rods of equal height arranged around the tower crane. The lightning rod is symmetrical to the center of the tower crane; the secondary lightning protection device of the control system includes: a three-phase power surge protection box arranged at the low distribution cabinet, a three-phase power surge protection module arranged at the frequency conversion cabinet, and a DC power surge protector, DB9/RS232 interface surge protector and TNC interface antenna feeder surge protector at the central control cabinet.

In order to realize the present invention better, further technical scheme is:

According to another embodiment of the present invention, the central control cabinet is further provided with an AC power surge protector.

According to another embodiment of the present invention, the height of the tower crane satisfies: h ₁ ≤ _{h 0} =hD/7P, where h is the height of the lightning rods, D is the distance between the lightning rods, and h ₀ is the lowest upper edge of the protection range of the lightning rods point height, h ₁ is the height of the tower crane, and P is the height influence coefficient.

The present invention can also be:

According to another embodiment of the present invention, the installation method of the three-phase power surge protection box at the low distribution cabinet:

① Design a suitable installation location next to the power supply where the three-phase surge protection box needs to be installed;

② Use a hand electric drill to drill and install plastic expansion screws at the location to be installed according to the size of the protection box;

③ Install the three-phase AC surge protection box on the plastic expansion screw and tighten the fixing screw;

④The three-phase surge protection box and the air switch and the three-phase phase line and zero corresponding of the air switch and protector access point are reliably connected by multi-strand single-core wires;

⑤ The grounding wire of the three-phase surge protection box shall be reliably connected to the grounding point with multi-strand single-core wires.

According to another embodiment of the present invention, the installation method of the three-phase power surge protection module at the frequency conversion cabinet includes:

① Design a suitable installation location next to the power supply where the three-phase power surge protection module needs to be installed;

②Use a hand electric drill to drill and install the guide rail according to the size of the guide rail at the position to be installed;

③ Install the three-phase power surge protection module on the guide rail and tighten the fixing screws;

④ The three-phase power surge protection module and the air switch and the three-phase phase line and zero phase of the air switch and protection access point are connected reliably with multi-strand single-core wires;

⑤ The grounding wire of the three-phase power surge protection module should be reliably connected to the grounding point with multi-strand single-core wires.

According to another embodiment of the present invention, the installation method of the DC power surge protector at the central control cabinet includes:

① Design a suitable installation location next to the power supply where the DC power surge protector needs to be installed;

②Use a hand electric drill to drill and install the guide rail according to the size of the guide rail at the position to be installed;

③ Install the DC power surge protector on the guide rail and tighten the fixing screws;

④ The positive pole and negative pole of the DC power surge protector and the air switch, as well as the air switch and the protection access point, should be connected reliably with multi-strand single-core wires;

⑤ The grounding wire of the DC power surge protector should be reliably connected to the grounding point with multi-strand flexible wires.

According to another embodiment of the present invention, the installation method of DB9/RS232 interface surge protector:

① Connect the external communication signal line to the input terminal of the DB9/RS232 interface surge protector;

② Connect the output terminal of the surge protector with DB9/RS232 interface to the PLC signal loop;

③The grounding terminal on the panel of the surge protector with DB9/RS232 interface should be reliably connected to the grounding point with a double-color multi-strand soft wire not less than ^4mm2 .

According to another embodiment of the present invention, the installation method of TNC interface antenna feeder lightning protector:

① Connect the external antenna feeder signal line to the input terminal of the TNC interface surge protector;

② Connect the output terminal of the TNC interface surge protector to the signal circuit of the MDS radio station;

③Just connect the grounding terminal on the surface of the TNC interface surge protector to the grounding grid well.

④ The grounding of the lightning protector for the antenna and feeder of the TNC interface should be reliably connected to the grounding point with multi-strand flexible wires.

Compared with the prior art, one of the beneficial effects of the present invention is:

The lightning protection device for the tower crane in front of the dam of the hydropower station solves the problem that the large tower crane in front of the dam of the hydropower station is struck by lightning, prevents damage to the mechanical and electrical systems of the large tower crane in front of the dam of the hydropower station and the damage to personnel caused by the lightning strike, and improves The reliability of tower crane operation. The invention simultaneously considers the direct lightning protection and the secondary lightning protection of the control system, the scheme is relatively perfect, and the lightning protection protection for the large tower crane in front of the dam of the hydropower station is safe and reliable.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiment of the present application document or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiment or the prior art. Apparently, the accompanying drawings in the following description The drawings are only references to some embodiments in the present application documents, and those skilled in the art can also obtain other drawings based on these drawings without creative efforts.

Fig. 1 is the front view of the protection range of the lightning rod in the direct lightning protection of the present invention;

Fig. 2 is a top view of the protection range of the lightning rod in the direct lightning protection of the present invention;

Fig. 3 is a schematic diagram of installation and wiring of a three-phase AC surge protection box in the secondary lightning protection of the control system of the present invention;

Fig. 4 is a schematic diagram of the installation and wiring of the three-phase power supply surge protection module in the secondary lightning protection of the control system of the present invention;

Fig. 5 is a schematic diagram of the installation and wiring of the DC lightning protection module in the secondary lightning protection of the control system of the present invention;

Fig. 6 is a schematic diagram of the installation and wiring of the DB9/RS232 interface surge protector in the secondary lightning protection of the control system of the present invention;

Fig. 7 is a schematic diagram of the installation and wiring of the TNC interface antenna feeder lightning protector in the secondary lightning protection of the control system of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

The lightning protection protection of the large tower crane in front of the dam of the hydropower station is divided into two parts, the first part is the protection of the direct lightning strike, and the second part is the secondary lightning protection of the control system. Specifically as shown in Figures 1 and 2, a lightning protection device for a tower crane in front of a hydropower dam includes a direct lightning protection device and a secondary lightning protection device for a control system. Lightning rods 1 of the same height around the four lightning rods 1 are symmetrical to the center of the tower crane 2; the height of the tower crane 2 satisfies: h1≤h0=h-D/7P, where h is the height of the lightning rod and D is the height of the lightning rod h0 is the height of the lowest point on the upper edge of the protection range of the lightning rod, h1 is the height of the tower crane 2, and P is the height influence coefficient; so as to prevent the tower crane from being directly struck by lightning.

The secondary lightning protection device of the control system includes: a three-phase power surge protection box installed at the low distribution cabinet, a three-phase power surge protection module installed at the frequency conversion cabinet, and a DC power supply installed at the central control cabinet. Surge protectors and AC power surge protectors, DB9/RS232 interface surge protectors and TNC interface antenna feeder lightning protectors are also installed at the central control cabinet.

Three-phase power surge protection box can adopt DGBS-IV three-phase AC surge protection box, DGBS-IV three-phase AC surge protection box is used for lightning and surge protection of three-phase power circuit; three-phase power supply surge protection module can adopt BY4-80/4-385 three-phase AC lightning protection module, BY4-80/4-385 three-phase AC lightning protection module is used for lightning protection of AC power control circuit, DC power surge protector can use DGBZ-II DC protection Lightning module, DGBZ－II DC lightning protection module is used for lightning protection of DC power supply control circuit, DB9/RS232 interface surge protector, TNC interface antenna feeder lightning protection device is used for lightning and surge protection of signal circuit.

Figure 3 is a schematic diagram of the installation and wiring of the three-phase AC surge protection box, which is used for lightning and surge protection of the three-phase power circuit. The installation method of the three-phase power surge protection box at the low distribution cabinet:

① Design a suitable installation location next to the power supply where the three-phase surge protection box needs to be installed;

② Use a hand electric drill to drill and install plastic expansion screws at the location to be installed according to the size of the protection box;

③ Install the three-phase AC surge protection box on the plastic expansion screw and tighten the fixing screw;

④Three-phase surge protection box and air switch (32A) and the three-phase phase line and zero corresponding to the access point of the air switch and protector are connected reliably with ^10mm2 yellow, green, red and black multi-strand single-core wires;

⑤ The grounding wire of the three-phase surge protection box is reliably connected to the grounding point with a 10mm ² yellow-green double-color multi-strand single-core wire.

Figure 4 is a schematic diagram of the installation and wiring of the three-phase power surge protection module, which is used for lightning protection of the AC power control circuit. The installation method of the three-phase power surge protection module at the frequency conversion cabinet includes:

① Design a suitable installation location next to the power supply where the three-phase power surge protection module needs to be installed;

②Use a hand electric drill to drill and install the guide rail according to the size of the guide rail at the position to be installed;

③ Install the three-phase power surge protection module on the guide rail and tighten the fixing screws;

④ The three-phase power surge protection module and the air switch and the three-phase phase line and zero phase of the air switch and protection access point are connected reliably with ^6mm2 yellow, green, red and black multi-strand single-core wires;

⑤ The grounding wire of the three-phase power surge protection module should be reliably connected to the grounding point with a 6mm ² yellow-green double-color multi-strand single-core wire.

Figure 5 is a schematic diagram of the installation and wiring of the DC lightning protection module, which is used for lightning protection of the DC power control circuit. The installation method of the DC power surge protector at the central control cabinet includes:

① Design a suitable installation location next to the power supply where the DC power surge protector needs to be installed;

②Use a hand electric drill to drill and install the guide rail according to the size of the guide rail at the position to be installed;

③ Install the DC power surge protector on the guide rail and tighten the fixing screws;

④ The positive pole and negative pole of the DC power surge protector and the air switch and the air switch and the protection access point should be connected reliably with ^4mm2 red and black multi-strand single-core wires;

⑤ The grounding wire of the DC power surge protector should be reliably connected to the grounding point with a 4mm ² double-color multi-strand flexible wire.

Figure 6 is a schematic diagram of the installation and wiring of the DB9/RS232 interface surge protector, which is used for lightning and surge protection of the signal circuit. The installation method of the DB9/RS232 interface surge protector:

① Connect the external communication signal line to the input terminal of the DB9/RS232 interface surge protector;

② Connect the output terminal of the surge protector with DB9/RS232 interface to the PLC signal circuit;

③The grounding terminal on the panel of the surge protector with DB9/RS232 interface should be reliably connected to the grounding point with a double-color multi-strand soft wire not less than ^4mm2 .

Figure 7 is a schematic diagram of the installation and wiring of the TNC interface antenna feeder lightning protector, which is used for lightning and surge protection of the signal circuit. The installation method of the TNC interface antenna feeder lightning arrester:

① Connect the external antenna feeder signal line to the input terminal of the TNC interface surge protector;

② Connect the output terminal of the TNC interface surge protector to the signal circuit of the MDS radio station;

③Just connect the ground terminal on the surface of the TNC interface surge protector to the ground grid;

④ The grounding of the lightning protector for the antenna and feeder of the TNC interface should be reliably connected to the grounding point with a double-color multi-strand soft wire not less than ^4mm2 .

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

References in this specification to "one embodiment", "another embodiment", "embodiment", etc. refer to the specific features, structures or characteristics described in conjunction with the embodiment included in the general description of this application. In at least one embodiment of . The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure or characteristic is described in combination with any embodiment, it is claimed that implementing such feature, structure or characteristic in combination with other embodiments also falls within the scope of the present invention.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it is to be understood that numerous other modifications and implementations can be devised by those skilled in the art which will fall within the scope of the disclosure disclosed in this application. within the scope and spirit of the principles. More specifically, within the scope of the disclosure and claims of the present application, various modifications and improvements can be made to the components and/or layout of the subject combination layout. In addition to modifications and improvements in component parts and/or layout, other uses will be apparent to those skilled in the art.

Claims (8)

1. the lightning protection device of tower crane in front of a hydropower station dam, it is characterized in that comprising direct lightning protection device and control system secondary lightning protection device, described direct lightning protection device comprises 4 contours arranged around tower crane (2) The lightning rod (1), the four lightning rods (1) are symmetrical to the center of the tower crane (2); the secondary lightning protection device of the control system includes: a three-phase power surge protection box arranged at the low distribution cabinet , the three-phase power surge protection module installed in the frequency conversion cabinet, the DC power surge protector installed in the central control cabinet, the DB9/RS232 interface surge protector and the TNC interface antenna feeder lightning arrester. 2. The lightning protection device for the tower crane in front of the dam of the hydropower station according to claim 1, characterized in that the central control cabinet is also provided with an AC power surge protector. 3. The lightning protection device of the tower crane in front of the dam of a hydropower station according to claim 1, wherein the height of the tower crane (2) satisfies: h ₁ ≤ h ₀ =hD/7P, wherein h is the height of the lightning rod, D is the distance between the lightning rods, _h0 is the height of the lowest point on the upper edge of the protection range of the lightning rods, _h1 is the height of the tower crane (2), and P is the height influence coefficient. 4. The lightning protection device of the tower crane in front of the dam of the hydropower station according to claim 1, characterized in that the installation method of the three-phase power surge protection box at the low distribution cabinet: ① Design a suitable installation location next to the power supply where the three-phase surge protection box needs to be installed; ② Use a hand electric drill to drill and install plastic expansion screws at the location to be installed according to the size of the protection box; ③ Install the three-phase AC surge protection box on the plastic expansion screw and tighten the fixing screw; ④Three-phase surge protection box and air switch and the three-phase phase line and zero-phase line of the air switch and protector access point are respectively connected reliably with multi-strand single-core wires; ⑤ The grounding wire of the three-phase surge protection box shall be reliably connected to the grounding point with multi-strand single-core wires. 5. The lightning protection device of the tower crane in front of the dam of the hydropower station according to claim 1, wherein the installation method of the three-phase power surge protection module at the frequency conversion cabinet comprises: ① Design a suitable installation location next to the power supply where the three-phase power surge protection module needs to be installed; ②Use a hand electric drill to drill and install the guide rail according to the size of the guide rail at the position to be installed; ③ Install the three-phase power surge protection module on the guide rail and tighten the fixing screws; ④ The three-phase power surge protection module and the air switch and the three-phase phase line and zero phase of the air switch and protection access point are connected reliably with multi-strand single-core wires; ⑤ The grounding wire of the three-phase power surge protection module should be reliably connected to the grounding point with multi-strand single-core wires. 6. The lightning protection device of the tower crane in front of the dam of the hydropower station according to claim 1, wherein the installation method of the DC power surge protector at the central control cabinet comprises: ① Design a suitable installation location next to the power supply where the DC power surge protector needs to be installed; ②Use a hand electric drill to drill and install the guide rail according to the size of the guide rail at the position to be installed; ③ Install the DC power surge protector on the guide rail and tighten the fixing screws; ④ The positive pole and negative pole of the DC power surge protector and the air switch, as well as the air switch and the protection access point, should be connected reliably with multi-strand single-core wires; ⑤ The grounding wire of the DC power surge protector should be reliably connected to the grounding point with multi-strand flexible wires. 7. The lightning protection device of the tower crane in front of the dam of the hydropower station according to claim 1, characterized in that the installation method of the DB9/RS232 interface surge protector: ①Connect the external communication signal line to the input terminal of the DB9/RS232 interface surge protector; ② Connect the output terminal of the surge protector with DB9/RS232 interface to the PLC signal loop; ③The grounding terminal on the panel of the surge protector with DB9/RS232 interface should be reliably connected to the grounding point with a double-color multi-strand soft wire not less than ^4mm2 . 8. The lightning protection device of the tower crane in front of the dam of the hydropower station according to claim 1, characterized in that the installation method of the lightning protection device for the antenna feeder of the TNC interface: ① Connect the external antenna feeder signal line to the input terminal of the TNC interface surge protector; ② Connect the output terminal of the TNC interface surge protector to the signal circuit of the MDS radio station; ③Just connect the grounding terminal on the surface of the TNC interface surge protector to the grounding grid well. ④ The grounding of the lightning protector for the antenna and feeder of the TNC interface should be reliably connected to the grounding point with multi-strand flexible wires.