WO2022161316A1

WO2022161316A1 - Surge protection device and power distribution device

Info

Publication number: WO2022161316A1
Application number: PCT/CN2022/073508
Authority: WO
Inventors: 邓子鸣; 郭威; 王啟伟; 任展林; 蔡报松
Original assignee: 华为数字能源技术有限公司
Priority date: 2021-01-29
Filing date: 2022-01-24
Publication date: 2022-08-04
Also published as: CN215817512U

Abstract

The present application relates to the technical field of power supply devices, and provides a surge protection device and a power distribution device. The surge protection device is used for connecting a power wire; the power wire comprises a neutral wire and live wires; the surge protection device comprises a neutral wire interface, a protective conductor interface, three live wire interfaces, and multiple surge protection modules. The neutral wire interface is used for connecting the neutral wire; the live wire interfaces are used for connecting the live wires; the protective conductor interface is used for connecting a protective conductor. The number of the surge protection modules connected in series between any two interfaces of the neutral wire interface, the protective conductor interface, and the three live wire interfaces is the same, and is at least 2. The surge protection device is used, and a circuit can still be normally protected when the surge protection device is connected inversely, thereby improving the safety and reliability.

Description

A lightning protection device and power distribution equipment

This application claims the priority of the Chinese patent application with the application number CN202120259413.7 and the invention name "A lightning protection device and power distribution equipment", which was submitted to the State Intellectual Property Office of China on January 29, 2021. Reference is incorporated in this application.

technical field

The present application relates to the technical field of power electronics, and in particular, to a wireless charging receiver, method and system.

Background technique

Surge Protector (Surge Protection Device, SPD), sometimes also called power surge protector, surge arrester or surge protector, is used when there is a surge in the electrical circuit caused by a lightning strike or other transient overvoltage, in a very short period of time. The current is turned on and shunted within a certain time to avoid damage to the subsequent equipment and realize the protection of the electrical circuit.

Referring to FIG. 1 , this figure is a schematic diagram of the connection of the multi-level lightning arrester provided in the prior art.

The selection of the lightning arrester is strongly related to the power grid system. In order to achieve compatibility with multi-standard AC input, a decoupling device L is connected between the front-level arrester 10 and the rear-level arrester 20 . When lightning strikes, the front-stage lightning arrester 10 first discharges a large part of the electricity, and the remaining electricity reaches the rear-stage lightning protection device 20 through the decoupling device L in the form of current. The induced voltage of the decoupling device L is proportional to the current steepness di/dt. When a lightning strike occurs, the load current can be ignored. The current flowing through the decoupling device L is basically the current flowing through the post-stage lightning arrester 20 . Because the lightning pulse duration is very short, the current is very large, and the average steepness can reach 30KA/μs, so the reverse induced voltage U2 on the coil is very high. Since U1=U2+U3, the higher U2 is, the smaller _U3 is, so Make the post-stage lightning arrester with lower tolerance to work safely.

However, in the communication power supply system, the regional power grid system where the lightning arrester may be applied is complex and changeable. For example, the power grid can adopt the three-phase four-wire system, the three-fire input system or the dual-fire input system. Mistakes in connection lead to the occurrence of lightning arrester fires from time to time. However, the above solutions adopted in the prior art cannot prevent the failure and fire risks caused by the reverse connection of the lightning arrester, and the safety and reliability are low.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present application provides a lightning protection device and power distribution equipment, which can still protect the circuit normally when the lightning protection device is reversely connected, thereby improving safety and reliability.

In a first aspect, the present application provides a lightning protection device, which includes a neutral wire interface, a protective conductor interface, three live wire interfaces and a plurality of lightning protection modules. Among them, the neutral wire interface is used to connect the neutral wire, the live wire interface is used to connect the live wire, and the protective conductor interface is used to connect the protective conductor. The number of lightning protection modules connected in series between any two of the neutral line interface, the protective conductor interface, and the three live line interfaces is the same, and the number is at least 2.

Using the lightning protection device, when the neutral line and the live line are misconnected, the neutral line interface and the protective conductor interface are protected by at least two lightning protection modules connected in series. Freewheeling interruption, avoiding the risk of failure and fire. The neutral line interface and the three live line interfaces of the arrester do not need to be all connected to the power line when in use. For different systems such as the three-phase four-wire system, the dual-line system, and the three-line system, the corresponding interfaces can be selected respectively. , the rest of the interfaces are empty. For any of the above systems, when there is a misconnection, the AC input is protected by at least two lightning protection modules connected in series, which can avoid the risk of failure and fire. In addition, since the number of lightning protection modules connected in series between any two interfaces is the same, the residual voltage level flowing into the post-stage lightning protection device or the post-stage circuit can be maintained to ensure that the lightning protection device can support multi-standard AC input, avoiding the use of decoupling devices, reducing cost and volume.

In a possible implementation manner, each lightning protection module includes at least M lightning protection devices and M−1 trigger capacitors, where M is an integer greater than 1. The first end of the first lightning protection device is the first end of the lightning protection module, the first end of the jth lightning protection device is connected to the second end of the j-1th lightning protection device, and the jth lightning protection device is connected to the second end of the j-1th lightning protection device. The second end of the lightning protection device is connected to the second end of the j+1th lightning protection device, and the second end of the Mth lightning protection device is the second end of the lightning protection module, j=2, 3, ..., M-1. The first end of the i-th trigger capacitor is connected to the second end of the i-th lightning protection device, i=0, 1, ..., M-1; the second end of the M-1 trigger capacitor is connected to the second end of the lightning protection module end.

When there is an overvoltage, the lightning protection device of the previous stage and the trigger capacitor divide the voltage. After the lightning protection device of the previous stage is broken down, the residual voltage is transmitted to the lightning protection device and the trigger capacitor of the next stage. After the lightning protection device of the next level is broken down, the remaining voltage will continue to be released to the next level, and so on, using the lightning protection module to be broken down to achieve conduction shunt, and then realize the protection of the electrical circuit.

In a possible implementation manner, the capacitance value of the trigger capacitor is negatively correlated with the response time of the lightning arrester.

According to the actual application requirements, determine the response time of the arrester, and then determine the capacitance value of the trigger capacitor; or adjust the response time of the arrester by adjusting the capacitance value of the trigger capacitor to meet different actual requirements.

The higher the capacitance value of the trigger capacitor, the lower the voltage divider of the trigger capacitor, the higher the voltage divider of the corresponding connected lightning protection device, the easier the lightning protection device is to be broken down, and the shorter the response time of the lightning protection device. The capacitance value is negatively correlated with the response time of the arrester.

In a possible implementation manner, N lightning protection modules connected in series between the neutral line interface and the protective conductor interface form the first branch, and the lightning protection device further includes at most N-1 module trigger capacitors. At most N-1 lightning protection modules in the N lightning protection modules are provided with module trigger capacitors. The first end of the module trigger capacitor is connected to the second end of the M-1 trigger capacitors of the lightning protection module, and the second end of the module trigger capacitor is connected to the second end of the lightning protection module.

At this time, the trigger capacitor of the module can enhance the freewheeling interrupting capability of the two lightning protection modules at the upper and lower ends.

In a possible implementation manner, the capacitance value of the trigger capacitor of the module is equal to the capacitance value of the trigger capacitor, so as to facilitate the design of the lightning arrester.

In a possible implementation manner, the lightning protection device is any one of the following:

Multilayer discharge tubes, metal gaps or graphite gaps.

In a possible implementation manner, the capacitance value of the trigger capacitor is greater than the capacitance value of the capacitance between the two poles of the lightning protection module, so that the capacitance between the poles of the lightning protection module can be divided to obtain a larger voltage, which can be preferentially broken down and less It is quickly broken down to realize the discharge of the current.

In a possible implementation, multiple lightning protection modules support the plug-in function, and the lightning protection device further includes a conduction module:

The continuity module is used to replace the pulled out lightning protection module to conduct the branch where it is located, thereby realizing hot swap of the lightning protection module.

In a possible implementation manner, the number of lightning protection modules connected in series between any two interfaces is positively related to the input voltage level of the power line, and is positively related to the freewheeling interrupting capability of the lightning protection device.

The number of lightning protection modules connected in series between any two interfaces can be adjusted according to the grid voltage level, input parameter requirements and freewheeling interruption requirements. The higher the grid voltage level, the more lightning protection modules connected in series between any two interfaces; the higher the requirements for freewheeling interruption, the more lightning protection modules connected in series between any two interfaces.

In a second aspect, the present application further provides a power distribution device, where the power distribution device includes the lightning arrester provided in the above implementation manner, and further includes at least one power distribution device. Wherein, the power distribution device includes a power cord inside, the first end of the power distribution device is provided with a wiring port, and the wiring port is used to connect the load. The second end of the power distribution device is provided with a power interface, and the power interface is used to connect the power cord.

The lightning protection device of the power distribution equipment, when the neutral line and the live line are misconnected, the neutral line interface and the protective conductor interface are protected by at least two lightning protection modules connected in series, and the freewheeling interrupting ability is strong. Freewheeling interruption can still be achieved, avoiding the risk of failure and fire. The neutral line interface and the three live line interfaces of the arrester do not need to be all connected to the power line when in use. For different systems such as the three-phase four-wire system, the dual-line system, and the three-line system, the corresponding interfaces can be selected respectively. , the rest of the interfaces are empty. For any of the above systems, when there is a misconnection, the AC input is protected by at least two lightning protection modules connected in series, which can avoid the risk of failure and fire. In addition, since the number of lightning protection modules connected in series between any two interfaces is the same, the residual voltage level flowing into the post-stage lightning protection device or the post-stage circuit can be maintained to ensure that the lightning protection device can support multi-standard AC input avoids the use of decoupling devices, reduces the cost and volume of the lightning arrester, and thus reduces the cost of power distribution equipment.

Description of drawings

Fig. 1 is the connection schematic diagram of the multi-stage lightning arrester provided by the prior art;

FIG. 2 is a schematic diagram of a schematic lightning arrester wiring reverse connection provided by the application;

3 is a schematic diagram of a lightning arrester provided by an embodiment of the present application;

4 is a schematic diagram of another lightning arrester provided by an embodiment of the present application;

5 is a schematic diagram of a lightning protection module provided by an embodiment of the present application;

6 is a schematic diagram of another lightning arrester provided by an embodiment of the present application;

7A is a schematic diagram of yet another lightning arrester provided by an embodiment of the present application;

7B is a schematic diagram of yet another lightning arrester provided by an embodiment of the application;

8 is a schematic diagram of another lightning arrester provided by an embodiment of the present application;

9 is a schematic diagram of another lightning arrester provided by an embodiment of the present application;

FIG. 10 is a schematic diagram of a power distribution device provided by an embodiment of the present application.

Detailed ways

In order for those skilled in the art to better understand the technical solutions provided by the embodiments of the present application, the following first introduces the application scenarios of the lightning protection device provided by the present application.

Lightning arrester is an important component in the power supply system of communication equipment, which is used to protect the power supply system and its load equipment from various overvoltages and inrush currents.

The lightning arrester in this application is mainly used in the AC 220V/380V power supply system. When the instantaneous overvoltage is caused by a direct lightning strike or induced lightning, the lightning arrester can conduct and shun the current in a very short time to avoid damage to the subsequent equipment.

In the communication power supply system, the lightning arrester is generally connected to the system busbar through manual wiring, so the operation error of the reverse connection of the cable is unavoidable, and the lightning arrester fire caused by the reverse connection of the cable sometimes occurs; on the other hand , The selection of lightning arrester is strongly related to the power grid system. Due to the complex power grid system in some regions (the Middle East, Latin America, etc.) The wiring is difficult to judge the grid system of the construction site, which also brings great difficulties to the lightning protection wiring.

Referring to FIG. 2 , this figure is a schematic diagram of a schematic reverse connection of a lightning arrester provided by the present application.

In the figure, the three-phase four-wire system is taken as an example, the power supply 10 is the live wire of the three phases of A, B, and C, and the N is the neutral wire.

During normal wiring, three phases A, B, and C pass through the circuit breaker 40 and the lightning protection air switch 50 and then connect to the corresponding lightning protection devices a, b and c respectively. Connect the protective conductor (Protecting Earth, PE) after the arrester d.

There is a wrong wiring in the figure, and the C-phase live wire and the neutral wire are reversely connected. At this time, the voltage at both ends of the arrester d is greater than the arc extinguishing voltage, so that the arrester d remains in a short-circuit conduction state until it burns, which may cause serious fire such as fire. ACCIDENT.

Therefore, it is necessary to carry out the anti-reverse connection design when installing the lightning arrester, and use the anti-reverse connection design to ensure the operability of the on-site construction, and avoid the safety risks caused by the reverse connection from the root cause. Referring to the solution shown in Figure 1, although the solution achieves compatibility of multi-standard AC input, it cannot prevent the failure and fire risk caused by the reverse connection of the lightning arrester.

In order to solve the above problems, the present application provides a lightning protection device and power distribution equipment. Any two input ports of the lightning protection device are connected between any live wire interface and the live wire interface, and between the live wire interface and the neutral wire interface. With the same number of graphite gap modules, when the interface of the lightning arrester is reversely connected, the circuit can still be normally protected, avoiding the occurrence of fire problems, and improving safety and reliability. In addition, the lightning protection circuit also supports multi-standard AC input.

The technical solutions of the present application will be described in detail below with reference to the accompanying drawings.

Words such as "first" and "second" in the following description of the present application are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features.

In this application, unless otherwise expressly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" may be a fixed connection, a detachable connection, or an integral body; it may be a direct connection, or a Indirect connections can be made through an intermediary.

Referring to FIG. 3 , this figure is a schematic diagram of a lightning arrester provided by an embodiment of the present application.

The illustrated lightning arrester 300 includes a neutral wire interface N, a protective conductor interface PE, a live wire interface L1 , a live wire interface L2 , a live wire interface L3 and a plurality of lightning protection modules 301 .

Among them, the neutral line interface N is used to connect the neutral line. FireWire interfaces L1, L2 and L3 support connecting different FireWires.

The protective conductor interface PE is used for connecting the protective conductor, that is, the protective conductor interface PE is used for grounding.

The number of lightning protection modules 301 connected in series between the neutral line interface N, the protective conductor interface PE, and any two of the three live line interfaces L1-L3 is the same. That is, between L1 and L2, between L1 and L3, between L1 and N, between L1 and PE, between L2 and L3, between L2 and N, between L2 and PE, between L3 and N, between L3 The same number of lightning protection modules 301 are connected in series between N and PE and between N and PE.

This embodiment of the present application does not specifically limit the number of lightning protection modules 301 connected in series between any two interfaces above, but the number is at least two.

Referring also to the schematic diagram of another lightning protection device shown in FIG. 4 , this figure shows an implementation manner when the number of lightning protection modules 301 connected in series between any two interfaces is greater than 2.

The principle of realizing the anti-reverse connection function of the lightning arrester 300 will be described below.

When wiring the lightning arrester 300, take the reverse connection of the neutral wire and a live wire as an example, it may be assumed that the neutral wire is wrongly connected to the live wire interface L1 at this time, and a live wire is wrongly connected to the neutral wire interface N. The line interface N and the protective conductor interface PE are protected by at least two lightning protection modules 301 connected in series, and the freewheeling interrupting capability is strong. When the lightning protection module operates (pulse breakdown), the lightning protection module presents a low impedance characteristic. At this time, there is a current flowing through the lightning protection module in the power supply circuit protected by the lightning protection module. Long-term freewheeling may cause damage to the power supply system and failure of the protected circuit, and enhancing the freewheeling interrupt capability can reduce the impact of freewheeling. Since the lightning arrester provided by the present application enhances the freewheeling interrupting capability, the freewheeling interrupting can still be achieved in the event of a wrong connection, thereby avoiding the risk of failure and fire.

The neutral wire interface N and the three live wire interfaces L1-L3 of the lightning arrester 300 provided in the embodiment of the present application do not need to be all connected to the power line when in use. You can select the corresponding required interfaces respectively, and the rest of the interfaces can be connected empty, but for any of the above standards, when there is a wrong connection, the AC input is protected by the gap between at least two lightning protection modules connected in series, so The residual voltage level that flows into the post-stage lightning arrester or the post-stage circuit can be maintained to be consistent to ensure that the lightning protection device can support multi-standard AC input, avoid the use of decoupling devices, and reduce cost and volume.

The specific implementation of the lightning arrester will be described below with reference to the accompanying drawings.

The lightning protection module provided by the embodiment of the present application includes a lightning protection device and a trigger capacitor. Wherein, the lightning protection device may be a multilayer discharge tube, a metal gap or a graphite gap, which will not be repeated in this embodiment of the present application. In the following, the lightning protection device is a graphite gap as an example for description.

Referring to FIG. 5 , this figure is a schematic diagram of a lightning protection module provided by an embodiment of the present application.

The illustrated lightning protection module 301 includes graphite gaps K1-K4 and trigger capacitors C1-C3.

Among them, graphite gaps K1-K4 are made of graphite material.

In Fig. 5, the number of graphite gaps of the lightning protection modules connected in series between any two interfaces of the lightning protection device remains the same, so the circuit of the entire lightning protection device is in a symmetrical state.

The lightning protection module 301 includes at least M lightning protection devices and (M-1) trigger capacitors, where M is an integer greater than 1.

The first end of the first lightning protection device is the first end of the lightning protection module 301, the first end of the jth lightning protection device is connected to the second end of the (j-1)th lightning protection device, and the jth lightning protection device is connected to the second end of the (j-1)th lightning protection device. The second end of the lightning protection device is connected to the second end of the (j+1)th lightning protection device, and the second end of the Mth lightning protection device is the second end of the lightning protection module, where j=2, 3 , ..., (M-1).

The first end of the ith trigger capacitor is connected to the second end of the ith lightning protection device, i=0, 1, . . . , (M-1).

The second ends of the above (M-1) trigger capacitors are connected to the second ends of the lightning protection module.

FIG. 5 shows the situation when the lightning protection module 301 includes four lightning protection devices, that is, M=4.

The connection point of the lightning protection module is called the neutral point. In the figure, the first end of K1 is connected to the neutral point, and the second end of K4 is connected to PE as an example to illustrate the working principle of the lightning protection module.

When there is an overvoltage between the neutral point and PE, the inter-electrode capacitance of the graphite gap K1 and the trigger capacitance C1 divide the voltage. In some embodiments, the capacitance value of the trigger capacitor C1 is set to be much larger than the capacitance value of the inter-electrode capacitance of the graphite gap K1. According to the principle of voltage division, the inter-electrode capacitance of the graphite gap K1 bears most of the voltage at this time, resulting in breakdown. . Subsequently, the residual voltage is transferred to the inter-electrode capacitance of the graphite gap K2 and the trigger capacitor C2. Similarly, the capacitance value of the trigger capacitor C2 is set to be much larger than the capacitance value of the inter-electrode capacitance of the graphite gap K1. Capacitors carry most of the voltage, causing them to break down.

By analogy with this principle, when the overvoltage is large enough, the entire lightning protection module is broken down to realize conduction and shunting, thereby realizing the protection of the electrical circuit.

It can be understood that, for the same lightning protection module, the specifications of each graphite gap and trigger capacitor included in the same lightning protection module are the same. The present application does not specifically limit the capacitance values of the trigger capacitors C1-C3. In some embodiments, the capacitance value of the trigger capacitor is more than 10 times the capacitance value of the inter-electrode capacitor, so that the inter-electrode capacitor can withstand most of the voltage.

Referring to FIG. 6 , this figure is a schematic diagram of another lightning arrester provided by an embodiment of the present application.

The lightning protection device shown in the figure uses the lightning protection module shown in Figure 5 as an example, in which the number of lightning protection modules connected in series between any two interfaces is 2.

In other embodiments, the number of lightning protection modules connected in series between any two interfaces is 4, 6 or more. In practical applications, in order to be more able to configure according to requirements, the lightning protection module can also support the hot-swap function. At this time, the lightning protection device also includes a conduction module, and the conduction module is used to replace the unplugged lightning protection module. In order to turn on the branch where the lightning protection module that was pulled out was originally located.

For example, when the number of lightning protection modules connected in series between any two interfaces is 4, some lightning protection modules can be correspondingly pulled out and replaced with continuity modules, so as to increase the number of lightning protection modules connected in series between any two interfaces. Transform to 2.

In practical applications, the number of lightning protection modules connected in series between any two interfaces can be adjusted according to the grid voltage level, input parameter requirements and freewheeling interruption requirements. Among them, the number of lightning protection modules connected in series between any two interfaces is positively related to the input voltage level of the power line, and is positively related to the freewheeling interrupting capacity requirement of the lightning protection device.

In addition, by adjusting the capacitance value of the trigger capacitor, the response time of the lightning arrester can be adjusted to meet different actual requirements. The higher the capacitance value of the trigger capacitor, the lower the voltage divider of the trigger capacitor, the higher the voltage divider of the corresponding connected lightning protection device, the easier the lightning protection device is to be broken down, and the shorter the response time of the lightning protection device. The capacitance value is negatively correlated with the response time of the arrester.

The lightning arrester shown in the figure also supports the connection of multi-standard AC input, which will be explained in detail below.

When connecting the AC input of the three-phase four-wire system, the live wire interfaces L1, L2 and L3 are respectively connected to a live wire, the neutral wire interface N is connected to the neutral wire, and the protective conductor interface PE is connected to the protective conductor.

When connecting the dual live wire system, any two of the live wire interfaces L1, L2 and L3 are connected to a live wire respectively, the protective conductor interface PE is connected to the protective conductor, and the other interfaces are empty.

When connecting the three live wire system, the live wire interfaces L1, L2 and L3 are respectively connected to a live wire, the protective conductor interface PE is connected to the protective conductor, and the other interfaces are empty.

To sum up, using the lightning protection device provided by the embodiment of the present application, when the neutral wire and the live wire are misconnected, the neutral wire interface and the protective conductor interface are protected by at least two lightning protection modules connected in series, and the freewheeling circuit is interrupted. It has strong capability and can still achieve freewheeling interruption when wrongly connected, avoiding the risk of failure and fire, and can support multi-standard AC input, avoid the use of decoupling devices, and reduce cost and volume.

In the above embodiments, the structures of the lightning protection modules connected to the interfaces are the same. In other embodiments, the lightning protection modules connected in series between the neutral line interface and the protective conductor interface can be regarded as a whole, which will be described in detail below.

Referring to FIG. 7A , which is a schematic diagram of yet another lightning arrester provided by an embodiment of the present application.

The difference between the surge arrester shown in FIG. 7A and the surge arrester shown in FIG. 6 is that the module trigger capacitor C0 is also included.

The N lightning protection modules connected in series between the neutral line interface N and the protective conductor interface PE form a first branch, and at this time, the lightning protection device further includes (N-1) module trigger capacitors.

The second end of the (M-1) trigger capacitors of each lightning protection module is connected to the second end of the lightning protection module where it is located through a module trigger capacitor.

The module trigger capacitor forms a whole of N lightning protection modules connected in series. In some embodiments, N lightning protection modules connected in series between the neutral line interface N and the protective conductor interface PE can be integrated into a whole.

The lightning protection module shown in the figure takes N=2 as an example. At this time, the module triggers the capacitor C0 to enhance the freewheeling interrupting capability of the two lightning protection modules at the upper and lower ends.

In some embodiments, the capacitance value of the module trigger capacitor is the same as the capacitance value of each trigger capacitor.

It can be understood that, in practical applications, the value range of the number of module trigger capacitors is 1-(N-1), that is, for N lightning protection modules to form the first branch, at most (N-1) The lightning module is provided with the module triggering capacitor.

Referring to FIG. 7B , this figure is a schematic diagram of yet another lightning arrester according to an embodiment of the present application.

The difference between the surge arrester shown in FIG. 7B and the surge arrester shown in FIG. 6 is that the module trigger capacitor C0 is also included.

N lightning protection modules connected in series between the protective conductor interface PE and a live wire interface form a second branch, and the lightning protection device further includes at most (N-1) module trigger capacitors.

At most (N-1) lightning protection modules in the N lightning protection modules are provided with module trigger capacitors.

The first end of the trigger capacitor of the module is connected to the second ends of the (M-1) trigger capacitors of the lightning protection module where it is located, and the second end of the trigger capacitor of the module is connected to the second end of the lightning protection module where it is located.

In the figure N=2, and taking the second branch formed by the protective conductor interface PE and the live wire interface L3 as an example, the module triggering capacitor C0 can enhance the freewheeling interrupting capability of the two lightning protection modules at the upper and lower ends.

In other embodiments, the second branch formed by the conductor interface PE and the live wire interface L1 and the second branch formed by the conductor interface PE and the live wire interface L2 may also be set correspondingly with module trigger capacitors.

Another implementation of the lightning arrester is described below.

Referring to FIG. 8 , this figure is a schematic diagram of another lightning protection device according to an embodiment of the present application.

The illustrated lightning arrester 300 includes a protective conductor interface PE, a first live wire interface L1, a second live wire interface L2 and a plurality of lightning protection modules.

The first live wire interface L1 and the second live wire interface L2 are used to connect the live wire.

The protective conductor interface PE is used to connect the protective conductor.

The number of lightning protection modules connected in series between any two of the protective conductor interface PE, the first live wire interface L1 and the second live wire interface L2 is the same, and the number is at least two.

For the specific implementation manner and principle of the lightning protection module, reference may be made to the relevant descriptions in the above embodiments, and details are not described herein again in the embodiments of the present application.

The difference between the lightning protection device and the lightning protection device provided in the above embodiment is that the lightning protection device is used in the grid of the dual live wire system, and the AC input of the two live wires is protected by at least two lightning protection modules connected in series, Strong freewheeling interrupting ability.

The following describes another implementation manner of the lightning arrester.

Referring to FIG. 9 , this figure is a schematic diagram of yet another lightning arrester provided by an embodiment of the present application.

The difference between the lightning arrester shown in FIG. 9 and FIG. 8 is that it also includes a third live wire interface L3.

The third FireWire interface is used to connect FireWire.

The number of lightning protection modules connected in series between any two of the protective conductor interface PE, the first live wire interface L1, the second live wire interface L2 and the third live wire interface is the same, and the number is at least two.

The lightning arrester is used in a power grid with three live wires, and the AC inputs of the three live wires are protected by at least two lightning protection modules connected in series, with strong freewheeling interrupting capability.

Based on the lightning arrester provided by the above embodiment, the implementation of the present application also provides a power distribution device, which will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 10 , this figure is a schematic diagram of a power distribution device provided by an embodiment of the present application.

The figure shows the implementation of the power distribution equipment applied to the three-phase four-wire system. When applied to other grid systems, the principle is similar, and the connection mode of the power line can be changed, which is not repeated in this embodiment.

The power distribution equipment 400 includes a lightning arrester 300 and at least one power distribution device 401 .

The power distribution equipment 400 includes power lines, and the power lines include three live lines and one neutral line. The first end of the power distribution device 401 is provided with a wiring port, and the wiring port is used to connect the load 500 . The second end of the power distribution device 401 is provided with a power interface, and the power interface is used to connect the power line.

The power distribution device 401 is used to supply power to the load 500 .

In some embodiments, the power distribution device 400 further includes a circuit breaker 40 for disconnecting the line in the event of a short circuit fault or overcurrent on the line.

For the specific implementation manner and working principle of the lightning arrester, reference may be made to the relevant descriptions in the above embodiments, and details are not described herein again in the embodiments of the present application.

To sum up, the lightning protection device of the power distribution equipment, when the neutral line and the live line are misconnected, the neutral line interface and the protective conductor interface are protected by at least two lightning protection modules connected in series, and the freewheeling ability is strong. , the freewheeling interruption can still be achieved in the case of misconnection, avoiding the risk of failure and fire. The neutral line interface and the three live line interfaces of the lightning arrester do not need to be all connected to the power line when in use. For different systems such as three-phase four-wire system, dual-line system, and three-line system, the corresponding interfaces can be selected respectively. , the rest of the interfaces are empty. For any of the above systems, when there is a misconnection, the AC input is protected by at least two lightning protection modules connected in series, which can avoid the risk of failure and fire.

In addition, since the number of lightning protection modules connected in series between any two interfaces is the same, the residual voltage level flowing into the post-stage lightning protection device or the post-stage circuit can be maintained to ensure that the lightning protection device can support multi-standard AC input avoids the use of decoupling devices, reduces the cost and volume of the lightning arrester, and thus reduces the cost of power distribution equipment.

It should be understood that, in this application, "at least one (item)" refers to one or more, and "a plurality" refers to two or more. "And/or" is used to describe the relationship between related objects, indicating that there can be three kinds of relationships, for example, "A and/or B" can mean: there is only A, only B, and both A and B exist , where A and B can be singular or plural. The character "/" generally indicates that the associated objects are an "or" relationship. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (a) of a, b or c, can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c" ", where a, b, c can be single or multiple.

The various embodiments in this specification are described in a progressive manner, and the same and similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from other embodiments. In addition, some or all of the units and modules may also be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

The above are only the specific embodiments of the present application. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as The protection scope of this application.

Claims

A lightning protection device is characterized in that it is used for connecting a power line, the power supply line includes a neutral wire and a live wire, and the lightning protection device includes a neutral wire interface, a protective conductor interface, three live wire interfaces and a plurality of lightning protection modules ;in,

The neutral line interface is used to connect the neutral line;

The live wire interface is used to connect the live wire;

the protective conductor interface is used to connect the protective conductor;

The number of lightning protection modules connected in series between any two of the neutral line interface, the protective conductor interface, and the three live line interfaces is the same, and the number is at least two.
The lightning protection device according to claim 1, wherein each of the lightning protection modules comprises at least M lightning protection devices and M-1 trigger capacitors, where M is an integer greater than 1;

The first end of the first lightning protection device is the first end of the lightning protection module, the first end of the jth lightning protection device is connected to the second end of the j-1th lightning protection device, and the jth lightning protection device is connected to the second end of the j-1th lightning protection device. The second end of the lightning protection device is connected to the second end of the j+1th lightning protection device, the second end of the Mth lightning protection device is the second end of the lightning protection module, and the j=2, 3, ..., M-1;

The first end of the i-th trigger capacitor is connected to the second end of the i-th lightning protection device, and the i=0, 1, ..., M-1;

The second ends of the M-1 trigger capacitors are connected to the second ends of the lightning protection module.
The lightning protection device according to claim 2, wherein the capacitance value of the trigger capacitor is negatively correlated with the response time of the lightning protection device.
The lightning protection device according to claim 3, wherein the N lightning protection modules connected in series between the neutral line interface and the protective conductor interface form a first branch circuit, and the lightning protection device further comprises: At most N-1 module trigger capacitors;

At most N-1 lightning protection modules in the N lightning protection modules are provided with the module trigger capacitors;

The first end of the trigger capacitor of the module is connected to the second ends of the M-1 trigger capacitors of the lightning protection module where it is located, and the second end of the trigger capacitor of the module is connected to the second end of the lightning protection module where it is located.
The lightning protection device according to claim 3, wherein the protective conductor interface and N lightning protection modules connected in series between one of the live wire interfaces form a second branch circuit, and the lightning protection device further comprises at most N lightning protection modules. -1 module trigger capacitor;

At most N-1 lightning protection modules in the N lightning protection modules are provided with the module trigger capacitors;

The first end of the trigger capacitor of the module is connected to the second ends of the M-1 trigger capacitors of the lightning protection module where it is located, and the second end of the trigger capacitor of the module is connected to the second end of the lightning protection module where it is located.
The lightning arrester according to claim 4 or 5, wherein the capacitance value of the trigger capacitor of the module is equal to the capacitance value of the trigger capacitor.
The lightning protection device according to claim 2, wherein the lightning protection device is any one of the following:

Multilayer discharge tubes, metal gaps or graphite gaps.
The lightning protection device according to any one of claims 2-7, wherein the capacitance value of the trigger capacitor is greater than the capacitance value of the capacitance between the two poles of the lightning protection module.
The lightning protection device according to any one of claims 2-7, wherein the plurality of lightning protection modules support a plug-in function, and the lightning protection device further comprises a conduction module:

The conducting module is used to replace the pulled out lightning protection module to conduct the branch where it is located.
The lightning protection device according to any one of claims 1 to 9, wherein the number of lightning protection modules connected in series between any two interfaces is positively correlated with the input voltage level of the power line, and is directly related to the The freewheeling interrupting capacity is positively correlated.
A power distribution device, characterized in that the power distribution device comprises the lightning arrester according to any one of claims 1-10, and further comprises at least one power distribution device;

The power distribution device includes the power cord inside;

The first end of the power distribution device is provided with a connection port, and the connection port is used to connect the load;

The second end of the power distribution device is provided with a power interface, and the power interface is used to connect the power line.