Outdoor electronic equipment input power lightning protector

Abstract

The utility model discloses an outdoor electronic equipment input power supply lightning protection device relates to lightning protection equipment technical field, it includes power input, power output and sets up between the lightning protection circuit of power input with power output, the lightning protection circuit includes isolation transformer, and the primary side and secondary side of isolation transformer all have the parallel connection of pressure sensitive resistance, power input is connected with power supply, and the power output is connected with the power input of outdoor electronic equipment. Compared with prior art, the utility model can effectively enhance the lightning protection effect of terminal electric equipment, and the damage of thunder and lightning to outdoor electronic equipment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of lightning protection equipment technology, and in particular to a lightning arrester for the input power supply of outdoor electronic equipment. Background Technology

[0002] In areas with frequent lightning activity, railway electrical equipment such as level crossing equipment and signaling equipment suffer severe physical damage and electrical performance degradation due to lightning strikes, posing a significant threat to their normal operation and safety. Despite the implementation of traditional lightning protection measures such as lightning protection and grounding, damage from lightning strikes remains frequent due to the complexity of lightning electromagnetic pulses, the sensitivity of equipment power systems, and the variability of the on-site electromagnetic environment. Investigations and extensive research have revealed that electronic components in the power supply sections of outdoor electronic equipment suffer significant damage. Strengthening lightning protection for the input power supply sections of outdoor electronic equipment can improve the lightning protection effect of terminal electrical equipment. Therefore, developing a high-performance dedicated surge protector to enhance surge protection for the input power supply sections of outdoor electronic equipment is a crucial technological breakthrough direction for improving the operational reliability of railway electrical equipment and ensuring the safe and efficient operation of railway transportation. Utility Model Content

[0003] This utility model provides an outdoor electronic device input power surge protector that can effectively enhance the lightning protection effect of terminal electrical equipment and reduce lightning damage to outdoor electronic equipment.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: This outdoor electronic device input power surge protector includes a power input terminal, a power output terminal, and a surge protection circuit disposed between the power input terminal and the power output terminal; the surge protection circuit includes an isolation transformer, and a varistor is connected in parallel on both the primary and secondary sides of the isolation transformer; the power input terminal is connected to a power supply, and the power output terminal is connected to the power input terminal of the outdoor electronic device.

[0005] A more specific technical solution than the above-mentioned technical solution may be: an isolating switch and a circuit breaker are provided between the power supply and the power input terminal, the isolating switch being located on the side closer to the power supply and the circuit breaker being located on the side closer to the power input terminal.

[0006] Furthermore, the isolation transformer has a turns ratio of 1:1, and its power is greater than 2 to 2.5 times the total load power of the outdoor electronic equipment.

[0007] Furthermore, the power supply access terminal, the disconnecting switch, and the circuit breaker are located inside the distribution box.

[0008] Furthermore, the power input terminal, the isolation transformer, the power output terminal, and the power input terminal of the outdoor electronic equipment are located inside the control box.

[0009] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0010] This utility model, through its multi-level lightning protection structure, can effectively release, isolate, and release the instantaneous voltage surge of outdoor power circuits caused by lightning strikes. In particular, by utilizing the magnetic flux saturation principle of the isolation transformer, it effectively controls the power supply at the secondary output voltage terminal to be relatively low, thereby maintaining a relatively stable input power supply for outdoor electronic equipment. This effectively enhances the lightning protection effect of terminal electrical equipment, reduces lightning damage to outdoor electronic equipment, and achieves the goal of protecting terminal electronic equipment. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model. Detailed Implementation

[0012] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model; however, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0013] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and other terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0014] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0015] like Figure 1 The outdoor electronic equipment input power surge protector shown includes a power input terminal, a power output terminal, and a surge protection circuit disposed between the power input terminal and the power output terminal; the surge protection circuit includes an isolation transformer BB, a first varistor R1 connected in parallel on the primary side of the isolation transformer BB, and a second varistor R2 connected in parallel on the secondary side of the isolation transformer BB; the power input terminal is connected to the power supply 1, and the power output terminal is connected to the power input terminal 2 of the outdoor electronic equipment.

[0016] A disconnecting switch QS and a circuit breaker QF are provided between the power supply 1 and the power input terminal. The disconnecting switch QS is located on the side closer to the power supply 1, and the circuit breaker QF is located on the side closer to the power input terminal.

[0017] The isolation transformer BB has a turns ratio of 1:1 and its power is 2 to 2.5 times greater than the total power of the outdoor electronic equipment load.

[0018] The power supply 1 connection terminal, disconnector QS, and circuit breaker QF are located inside the distribution box. The power input terminal, isolation transformer BB, power output terminal, and power input terminal 2 of outdoor electronic equipment are located inside the control box.

[0019] In this embodiment, the first varistor R1 is a 25D471K, the second varistor R2 is a 14D471K, the power supply 1 is connected to a 380VAC power supply, and the power supply at both the power input and power output terminals is 220VAC.

[0020] The working principle of this utility model is as follows: the first varistor R1 serves as the first-stage surge protection unit, the isolation transformer BB serves as the second-stage surge protection unit, and the second varistor R2 serves as the third-stage surge protection unit.

[0021] Under normal operating conditions, the 380VAC three-phase four-wire power supply 1, after passing through the isolating switch QS and the circuit breaker QF, outputs a 220VAC single-phase power supply to the surge protection circuit. In the surge protection circuit, the 220VAC power supply first passes through the first varistor R1. Under normal voltage, this varistor exhibits high resistance, having minimal impact on the circuit. Then, it passes through the 1:1 isolation transformer BB, which isolates the electrical connection between the primary and secondary sides, preventing interference from the primary side from being transmitted to the secondary side. The power output from the secondary side of the isolation transformer BB then passes through the second varistor R2, finally providing a stable 220VAC power supply to the outdoor electronic equipment at the railway crossing for operation.

[0022] In the event of a lightning strike, the first varistor R1, acting as the first-stage surge protection unit, performs a first-stage current bleed, simultaneously protecting the isolation transformer BB. The second-stage surge protection unit utilizes the isolation transformer BB's characteristic of isolating the primary and secondary electrical connections, reducing lightning interference and noise entering the output circuit. It further controls the output voltage using the magnetic flux saturation principle of the isolation transformer. The second varistor R2, acting as the third-stage surge protection unit, performs a second-stage overvoltage bleed, clamping the output voltage within a safe range to ensure a stable and safe power supply to outdoor electronic equipment at railway crossings, preventing damage to outdoor electronic equipment due to lightning strikes.

[0023] The disconnector switch QS is used to isolate the power supply and ensure safety during maintenance and other operations. The circuit breaker QF automatically disconnects the circuit when overload, short circuit or other faults occur.

[0024] This utility model, through its multi-level lightning protection structure, can effectively release, isolate, and release the instantaneous voltage surge of outdoor power circuits caused by lightning strikes. In particular, by utilizing the magnetic flux saturation principle of the isolation transformer, it effectively controls the power supply at the secondary output voltage terminal to be relatively low, thereby maintaining a relatively stable input power supply for outdoor electronic equipment. This effectively enhances the lightning protection effect of terminal electrical equipment, reduces lightning damage to outdoor electronic equipment, and achieves the goal of protecting terminal electronic equipment.

Claims

1. An outdoor electronic equipment input power surge protector, characterized by: It includes a power input terminal, a power output terminal, and a surge protection circuit disposed between the power input terminal and the power output terminal; the surge protection circuit includes an isolation transformer, and a varistor is connected in parallel on both the primary and secondary sides of the isolation transformer; the power input terminal is connected to a power supply, and the power output terminal is connected to the power input terminal of an outdoor electronic device.

2. The outdoor electronic equipment input power surge protector of claim 1, wherein: An isolating switch and a circuit breaker are provided between the power supply and the power input terminal. The isolating switch is located on the side closer to the power supply, and the circuit breaker is located on the side closer to the power input terminal.

3. The surge protector for outdoor electronic equipment input power supply according to claim 2, characterized in that: The isolation transformer has a turns ratio of 1:1 and its power is greater than 2 to 2.5 times the total power of the outdoor electronic equipment load.

4. The surge protector for outdoor electronic equipment input power supply according to claim 3, characterized in that: The power supply access terminal, the disconnecting switch, and the circuit breaker are located inside the distribution box.

5. The outdoor electronic equipment input power surge protector according to claim 4, characterized in that: The power input terminal, the isolation transformer, the power output terminal, and the power input terminal of the outdoor electronic equipment are located inside the control box.

Images