A method for live working of a low and medium voltage lightning protection device

Abstract

The application relates to a live working method for a low-voltage lightning protection device, wherein during testing, a main line is disconnected from a protection branch by a pre-set switch on the protection branch, and then a test signal is applied to the lightning protection device on the protection branch, so as to avoid the influence of the test signal on the main line. Then, the test signal is collected through a second test point on the protection branch, and the working state of the lightning protection device is judged through automatic analysis of the test signal. Since manual signal collection is not required, the test operation is efficient and safe. In addition, when problems exist in the lightning protection device, the maintenance personnel are prompted based on the test results, so as to assist the maintenance operation of the maintenance personnel. Therefore, the application greatly improves the efficiency and safety of lightning protection device maintenance.

Description

Technical Field

[0001] This invention relates to the field of surge protector technology, and in particular to a method and system for live-line operation of medium and low voltage surge protection devices. Background Technology

[0002] Lightning protection devices (surge protectors) in medium and low voltage power distribution systems are mainly used for lightning protection and current discharge. They are installed between the main line and the indoor jumper, with their grounding wire leading out outdoors through the pass-through window and connected to the tower or directly to the grounding grid, preventing lightning from entering through the main line. When an overvoltage wave generated by a distant lightning strike enters along the main line, the lightning protection device can divert this overvoltage pulse wave to the ground, dissipating all the damage from the lightning current.

[0003] Medium and low voltage power systems require a certain number of lightning protection devices to meet the requirements. However, lightning protection devices can overheat, age, or even be damaged when subjected to surge voltage and surge current. Once a fault occurs, it is often difficult to detect, and the exact location of the faulty lightning protection device cannot be determined in time. As a result, the damaged lightning protection device cannot be replaced in time. If indirect lightning, direct lightning, and transient overvoltage occur, it will seriously affect the safe operation of the power system.

[0004] Therefore, during the operation of medium and low voltage power systems, lightning protection devices need to be maintained regularly, including testing and replacement. However, since lightning protection devices are connected to the main power line, maintenance can affect the main power line. Furthermore, the current maintenance process requires manual, one-by-one maintenance of each lightning protection device, which is inefficient and poses safety hazards. Summary of the Invention

[0005] This invention provides a method and system for live-line work on medium and low voltage lightning protection devices to solve the technical problems of existing technologies, such as the impact on the main line during maintenance, low maintenance efficiency, and potential safety hazards.

[0006] A method for live-line working on medium and low voltage lightning protection devices, the method comprising:

[0007] Before testing the lightning protection device, the main line is disconnected from the protection branch by a switch that is pre-installed on the protection branch, wherein the protection branch is the branch where the lightning protection device is located.

[0008] A pulse signal is generated based on the type of the lightning protection device, and the pulse signal is applied to the first test point of the protection branch through a pre-set test line, wherein the first test point is a point between the protection branch and the main line;

[0009] Test signals are collected at the second test point of the protection branch, wherein the second test point is a point between the protection branch and the ground wire;

[0010] The test results of the lightning protection device are determined based on the test signals, and maintenance work is carried out on the lightning protection device based on the test results.

[0011] In one embodiment of this application, generating a pulse signal based on the type of the lightning protection device includes:

[0012] Obtain the type of the lightning protection device;

[0013] When the lightning protection device is a switch-type protector, a first pulse signal is generated, wherein the first pulse signal includes multiple first pulses with the same maximum amplitude;

[0014] When the lightning protection device is a voltage-limiting protector, a second pulse signal is generated, wherein the second pulse signal is a single second pulse, and the width of the second pulse is greater than the width of the first pulse.

[0015] In one embodiment of this application, when the lightning protection device is a switch-type protector, determining the test result of the lightning protection device based on the test signal includes:

[0016] Determine the waveform characteristics of the test signal;

[0017] When the test signal includes multiple third pulses, and the multiple third pulses and multiple first pulses satisfy a first target condition, the lightning protection device is determined to be normal; otherwise, the lightning protection device is determined to be abnormal; wherein, the first target condition includes:

[0018] The plurality of third pulses are synchronized with the plurality of first pulses;

[0019] The lowest points of the multiple third pulses have the same amplitude.

[0020] In one embodiment of this application, the method further includes determining whether the plurality of third pulses are synchronized with the plurality of first pulses:

[0021] Determine the highest point of pulse amplitude of the plurality of first pulses and the plurality of third pulses, and the target time corresponding to the highest point of pulse;

[0022] When the difference between the target time point of the plurality of first pulses and the target time point of the plurality of third pulses is less than a preset threshold, the plurality of third pulses are determined to be synchronized with the plurality of first pulses; otherwise, the plurality of third pulses are determined to be out of sync with the plurality of first pulses.

[0023] In one embodiment of this application, when the lightning protection device is a voltage-limiting protector, determining the test result of the lightning protection device based on the test signal includes:

[0024] Determine the pulse width of the second pulse at a first height and a second height, and determine the waveform characteristics of the test signal, wherein the first height is smaller than the second height;

[0025] When the test signal includes a fourth pulse, and the fourth pulse and the second pulse satisfy the second target condition, the lightning protection device is determined to be normal; otherwise, the lightning protection device is determined to be abnormal; wherein, the second target condition includes:

[0026] The difference between the time corresponding to the highest point of the pulse amplitude of the second pulse and the time corresponding to the highest point of the pulse amplitude of the fourth pulse is less than a preset threshold.

[0027] The ratio of the pulse width of the second pulse at the first height to the pulse width at the second height is greater than the ratio of the pulse width of the fourth pulse at the first height to the pulse width at the second height.

[0028] In one embodiment of this application, maintenance work on the lightning protection device based on the test results includes:

[0029] When the lightning protection device malfunctions, the corresponding switch remains open, maintenance and replacement information is generated, and the maintenance and replacement information is sent to the target object.

[0030] When the lightning protection device is functioning normally, the corresponding switch is switched to the closed state, a work completion notification is generated, and the work completion notification is sent to the target object.

[0031] In one embodiment of this application, it further includes:

[0032] In response to a notification that the repair or replacement of the target object is complete, the corresponding switch is switched to the closed state.

[0033] In one embodiment of this application, the maintenance and replacement information includes the location information of the corresponding lightning protection device.

[0034] In one embodiment of this application, the switch is a relay, which is controlled by a control circuit, and the control circuit is connected to a remote control terminal through an internal communication module.

[0035] In one embodiment of this application, a test signal is collected by a current transformer preset at the second test point of the protection branch, and the current transformer is connected to the control circuit through an energy metering chip.

[0036] This invention provides a method for live-line work on medium and low voltage lightning protection devices, which has the following advantages: During testing, the main line is disconnected from the protection branch by a pre-installed switch. Then, a test signal is applied to the lightning protection device on the protection branch, thus avoiding any impact on the main line. The test signal is then collected through a second test point on the protection branch, and the operating status of the lightning protection device is determined by automatic analysis of the test signal. Since manual signal acquisition is not required, the testing operation is highly efficient and safe. Furthermore, if a problem is found with the lightning protection device, the test results will provide prompts to maintenance personnel to assist in their maintenance work. Therefore, this invention significantly improves the efficiency and safety of lightning protection device maintenance. Attached Figure Description

[0037] Figure 1 This is a schematic diagram illustrating an implementation scenario of a live-line working method for medium and low voltage lightning protection devices in this embodiment.

[0038] Figure 2 This is a flowchart illustrating the implementation of a live-line working method for medium and low voltage lightning protection devices in this embodiment.

[0039] Figure 3 This is a schematic diagram of a live-line working system for a medium- and low-voltage lightning protection device in this embodiment. Detailed Implementation

[0040] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0041] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0042] Numerous details are explored in the following description to provide a more thorough explanation of embodiments of this application; however, it will be apparent to those skilled in the art that embodiments of this application may be practiced without these specific details.

[0043] Figure 1This is a schematic diagram illustrating an implementation scenario of a live-line working method for medium and low voltage lightning protection devices in this embodiment. Figure 1 As shown, this embodiment is used for live-line maintenance of lightning protection devices in a medium- and low-voltage power distribution network within a computer room. Multiple lightning protection devices (generally surge protectors) are installed in the medium- and low-voltage power distribution network. These devices are connected to multiple main lines in parallel; that is, one end of the protection branch is connected to the main line, and the other end is grounded. When a voltage pulse caused by lightning or other reasons enters the power grid from the main line, the surge protector diverts the voltage pulse to the ground wire, preventing damage to electrical equipment within the power grid due to lightning strikes.

[0044] To facilitate the maintenance of the lightning protection device, this application includes a remotely controllable switch pre-installed in the protection branch circuit. This switch controls the connection and disconnection between the protection branch circuit and the main line. Additionally, a high-voltage pulse generator is installed at the location of the equipment room, connected to the first test point of the branch circuit via a test line. When the switch is open, the high-voltage pulse generator produces a high-voltage pulse to simulate a lightning strike on the main line, thus testing the lightning protection device. Finally, a current transformer is installed on the protection branch circuit to collect the test signal. Since the principle of the lightning protection device is to discharge the pulse to the ground wire, the protection branch circuit should guide the high-voltage pulse to the ground wire when it is generated. Therefore, by collecting the pulse signal on the protection branch circuit through the current transformer, it is possible to determine whether the lightning protection device is functioning properly. The high-voltage pulse generator is connected to the control PC in the equipment room, the current transformer is connected to the control PC in the equipment room via an energy metering chip, and the switch is connected to the control PC in the equipment room via a control circuit. The control PC is connected to a remote control terminal via a network. Therefore, the live-line working method in this embodiment can be executed by the local control PC in the computer room, or the live-line working method in this embodiment can be executed by the remote control terminal remotely controlling the local control PC.

[0045] After obtaining the test results, the control PC or remote control terminal sends the test results and the location information of the corresponding lightning protection device to the target object. The target object then repairs or replaces the faulty lightning protection device based on the location information, thereby completing the live maintenance work of the lightning protection device.

[0046] like Figure 2 As shown, the live-line working method for medium and low voltage lightning protection devices provided in this application includes at least steps S210 to S240, which are described in detail below:

[0047] S210, Before testing the lightning protection device, the main line is disconnected from the protection branch by a switch that is pre-installed on the protection branch, wherein the protection branch is the branch where the lightning protection device is located;

[0048] The switch is a relay, which is controlled by a control circuit connected to a remote control terminal via an internal communication module. In this embodiment, if maintenance of the lightning protection device is required, a command can be issued from the control PC to disconnect the relay, facilitating subsequent inspection and maintenance. Since the main line is disconnected from the protected branch using the switch, the main line will not be affected during subsequent inspection and maintenance.

[0049] S220, a pulse signal is generated based on the type of the lightning protection device, and the pulse signal is applied to the first test point of the protection branch through a pre-set test line, wherein the first test point is a point between the protection branch and the main line;

[0050] The pulse signal is generated according to the type of lightning protection device. In this embodiment, two different waveform pulse signals are constructed for the switching type protector and the voltage-limiting type protector, respectively. Specifically, the construction process includes:

[0051] Obtain the type of the lightning protection device;

[0052] When the lightning protection device is a switch-type protector, a first pulse signal is generated, wherein the first pulse signal includes multiple first pulses with the same maximum amplitude;

[0053] When the lightning protection device is a voltage-limiting protector, a second pulse signal is generated, wherein the second pulse signal is a single second pulse, and the width of the second pulse is greater than the width of the first pulse.

[0054] In this application, for a switching protector, when the voltage value of the pulse signal rises to the target value, the protector opens like a switch, and then the impedance inside the protector changes instantaneously from high impedance to low impedance. Therefore, in this embodiment, for the switching protector, multiple first pulses with the same maximum amplitude are used to repeatedly test the switching capability of the switching protector.

[0055] For voltage-limiting protectors, as the voltage value of the pulse signal increases, the impedance inside the protector decreases slowly. Therefore, in this embodiment, a pulse signal with a relatively large pulse width is used to test the voltage-limiting protector. The change in the signal after passing through the voltage-limiting protector is observed to analyze whether the protector is working properly.

[0056] S230, a test signal is acquired at the second test point of the protection branch, wherein the second test point is a point between the protection branch and the ground wire;

[0057] Since the test signal is applied to the first test point, the pulse can only flow from the first test point to the ground wire. Therefore, a second test point is set between the ground wire and the protection branch to collect the test signal, so as to determine whether the lightning protection device is working properly through the test signal.

[0058] Specifically, test signals are collected by a current transformer preset at the second test point of the protection branch, and the current transformer is connected to the control circuit through an energy metering chip.

[0059] S240, determine the test result of the lightning protection device based on the test signal, and perform maintenance work on the lightning protection device based on the test result.

[0060] Since there are two types of lightning protection devices in this embodiment, there are also two corresponding test signals. The specific analysis is as follows:

[0061] Wherein, when the lightning protection device is a switch-type protector, determining the test result of the lightning protection device based on the test signal includes:

[0062] Determine the waveform characteristics of the test signal;

[0063] When the test signal includes multiple third pulses, and the multiple third pulses and multiple first pulses satisfy a first target condition, the lightning protection device is determined to be normal; otherwise, the lightning protection device is determined to be abnormal; wherein, the first target condition includes:

[0064] The plurality of third pulses are synchronized with the plurality of first pulses;

[0065] The lowest points of the multiple third pulses have the same amplitude.

[0066] In this embodiment, the protection branch is considered as a series circuit of the internal resistance of the protector and the resistance of the second test point-ground wire. Based on the series voltage divider characteristic, the following analysis is performed: When the voltage of the switch-type protector rises to the target value, the internal high impedance directly becomes low impedance, exhibiting the characteristics of a "switch". Therefore, when the pulse rises to the target value, the protection branch is instantly turned on, and the voltage signal (third pulse) of the second test point is basically consistent with the first pulse from this time. After the voltage drops to the target value, the "switch" inside the switch-type protector closes, and the voltage of the second test point returns to zero. Therefore, the position of the third pulse is above the target value and is synchronized with the first pulse. Based on the above characteristics, if the third pulse simultaneously meets the first target condition, that is, simultaneously meets: (1) the multiple third pulses are synchronized with the multiple first pulses; (2) the amplitude corresponding to the lowest point of the multiple third pulses is consistent, it can be determined that the corresponding lightning protection device is working normally.

[0067] Specifically, in one embodiment of this application, the method further includes determining whether the plurality of third pulses are synchronized with the plurality of first pulses:

[0068] Determine the highest point of pulse amplitude of the plurality of first pulses and the plurality of third pulses, and the target time corresponding to the highest point of pulse;

[0069] When the difference between the target time point of the plurality of first pulses and the target time point of the plurality of third pulses is less than a preset threshold, the plurality of third pulses are determined to be synchronized with the plurality of first pulses; otherwise, the plurality of third pulses are determined to be out of sync with the plurality of first pulses.

[0070] In this method, the highest point (i.e., the inflection point) of each pulse is taken as its target time point. If the target time points of multiple first pulses are consistent with the target time points of multiple third pulses, it indicates that the first and third pulses changed at the same time, and the time interval between adjacent pulses is consistent. Therefore, it can be determined that the first and third pulses are synchronized. However, since data inevitably changes during transmission, this embodiment still retains a redundancy, that is, if the time difference is less than a preset threshold, it is also considered as synchronization.

[0071] When the lightning protection device is a voltage-limiting type protector, the test result of the lightning protection device is determined based on the test signal, including:

[0072] Determine the pulse width of the second pulse at a first height and a second height, and determine the waveform characteristics of the test signal, wherein the first height is smaller than the second height;

[0073] When the test signal includes a fourth pulse, and the fourth pulse and the second pulse satisfy the second target condition, the lightning protection device is determined to be normal; otherwise, the lightning protection device is determined to be abnormal; wherein, the second target condition includes:

[0074] The difference between the time corresponding to the highest point of the pulse amplitude of the second pulse and the time corresponding to the highest point of the pulse amplitude of the fourth pulse is less than a preset threshold.

[0075] The ratio of the pulse width of the second pulse at the first height to the pulse width at the second height is greater than the ratio of the pulse width of the fourth pulse at the first height to the pulse width at the second height.

[0076] In this embodiment, as the voltage of the voltage-limiting protector rises, the internal high impedance slowly changes to low impedance over a process. Therefore, the voltage from the second test point to the ground wire will gradually increase as the impedance component of the protector decreases. However, due to the voltage divider characteristic, the width of the fourth pulse will narrow, that is, the smaller the voltage amplitude of the second pulse, the more voltage is divided by the internal resistance of the protector. Therefore, in this embodiment, to determine whether the voltage-limiting protector is working properly, the waveform of the fourth pulse is analyzed to see if it meets the above characteristics, namely: (1) the second pulse and the fourth pulse are synchronized, specifically: the difference between the time corresponding to the highest point of the pulse amplitude of the second pulse and the time corresponding to the highest point of the pulse amplitude of the fourth pulse is less than a preset threshold; (2) the ratio of the pulse width of the second pulse at the first height to the pulse width at the second height is greater than the ratio of the pulse width of the fourth pulse at the first height to the pulse width at the second height.

[0077] In one embodiment of this application, maintenance work on the lightning protection device based on the test results includes:

[0078] When the lightning protection device malfunctions, the corresponding switch remains open, maintenance and replacement information is generated, and the maintenance and replacement information is sent to the target object.

[0079] When the lightning protection device is functioning normally, the corresponding switch is switched to the closed state, a work completion notification is generated, and the work completion notification is sent to the target object.

[0080] The maintenance and replacement information includes the location information of the corresponding lightning protection device. When a lightning protection device malfunctions, maintenance and replacement information with location information is sent to the target (i.e., maintenance personnel). Maintenance personnel can then repair or replace the lightning protection device at the target location based on the location information. Specifically, the location information is pre-stored in the control PC.

[0081] In one embodiment of this application, it further includes:

[0082] In response to a notification that the repair or replacement of the target object is complete, the corresponding switch is switched to the closed state.

[0083] After the repair or replacement is completed, the maintenance personnel will send the information to the remote control terminal of the control PC. The control PC will then close the corresponding switch so that the protection branch can continue to provide lightning protection for the main line.

[0084] This invention provides a method for live-line work on medium- and low-voltage surge protection devices. During testing, a switch is pre-installed on the protection branch to disconnect the main line from the protection branch. Then, a test signal is applied to the surge protection device on the protection branch, thus preventing the test signal from affecting the main line. The test signal is then collected through a second test point on the protection branch, and the operating status of the surge protection device is determined by automatic analysis of the test signal. Since manual signal acquisition is not required, the testing operation is highly efficient and safe. Furthermore, if a problem is found with the surge protection device, the test results will provide prompts to maintenance personnel to assist in their maintenance work. Therefore, this application significantly improves the efficiency and safety of surge protection device maintenance.

[0085] like Figure 3 As shown, this application also provides a live-line working system for medium and low voltage lightning protection devices, the system comprising:

[0086] A circuit breaker module is used to disconnect the main line from the protection branch by a switch pre-set on the protection branch before testing the lightning protection device, wherein the protection branch is the branch where the lightning protection device is located.

[0087] A pulse generation module is used to generate a pulse signal based on the type of the lightning protection device, and apply the pulse signal to the first test point of the protection branch through a pre-set test line, wherein the first test point is a point between the protection branch and the main line;

[0088] The acquisition module is used to acquire test signals at the second test point of the protection branch, wherein the second test point is a point between the protection branch and the ground wire;

[0089] The analysis module is used to determine the test results of the lightning protection device based on the test signal, and to perform maintenance operations on the lightning protection device based on the test results.

[0090] This application provides a live-line working system for medium and low voltage surge protection devices. During testing, a switch is pre-installed on the protection branch to disconnect the main line from the protection branch. Then, a test signal is applied to the surge protection device on the protection branch, thus preventing the test signal from affecting the main line. The test signal is then collected through a second test point on the protection branch, and the operating status of the surge protection device is determined by automatic analysis of the test signal. Since manual signal acquisition is not required, the testing operation is highly efficient and safe. Furthermore, if a problem is found with the surge protection device, the test results will provide prompts to maintenance personnel to assist in their maintenance work. Therefore, this application significantly improves the efficiency and safety of surge protection device maintenance.

[0091] In the above embodiments, although the present application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art based on the foregoing description. The embodiments of the present application are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims.

[0092] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A method for live working of a low and medium voltage lightning protection device, characterized in that, The method includes: Before testing the lightning protection device, the main line is disconnected from the protection branch by a switch that is pre-installed on the protection branch, wherein the protection branch is the branch where the lightning protection device is located. A pulse signal is generated based on the type of the lightning protection device, and the pulse signal is applied to a first test point of the protection branch through a pre-set test line, wherein the first test point is a point between the protection branch and the main line; generating the pulse signal based on the type of the lightning protection device includes: obtaining the type of the lightning protection device; when the lightning protection device is a switch-type protector, generating a first pulse signal, wherein the first pulse signal includes multiple first pulses with the same maximum amplitude; when the lightning protection device is a voltage-limiting protector, generating a second pulse signal, wherein the second pulse signal is a single second pulse, wherein the width of the second pulse is greater than the width of the first pulse; Test signals are collected at the second test point of the protection branch, wherein the second test point is a point between the protection branch and the ground wire; The test results of the lightning protection device are determined based on the test signal, and maintenance work is performed on the lightning protection device based on the test results. When the lightning protection device is a switch-type protector, determining the test results of the lightning protection device based on the test signal includes: determining the waveform characteristics of the test signal; when the test signal includes multiple third pulses, and the multiple third pulses and multiple first pulses satisfy a first target condition, the lightning protection device is determined to be normal; otherwise, the lightning protection device is determined to be abnormal; wherein, the first target condition includes: the multiple third pulses are synchronized with the multiple first pulses; the amplitudes corresponding to the lowest points of the multiple third pulses are consistent.

2. The method according to claim 1, wherein The method also includes determining whether the plurality of third pulses are synchronized with the plurality of first pulses: Determine the highest point of pulse amplitude of the plurality of first pulses and the plurality of third pulses, and the target time corresponding to the highest point of pulse; When the difference between the target time point of the plurality of first pulses and the target time point of the plurality of third pulses is less than a preset threshold, it is determined that the plurality of third pulses are synchronized with the plurality of first pulses; Otherwise, it is determined that the plurality of third pulses are out of sync with the plurality of first pulses.

3. The method according to claim 1, wherein, When the lightning protection device is a voltage-limiting type protector, the test result of the lightning protection device is determined based on the test signal, including: Determine the pulse width of the second pulse at a first height and a second height, and determine the waveform characteristics of the test signal, wherein the first height is smaller than the second height; When the test signal includes a fourth pulse, and the fourth pulse and the second pulse satisfy the second target condition, the lightning protection device is determined to be normal; otherwise, the lightning protection device is determined to be abnormal; wherein, the second target condition includes: The difference between the time corresponding to the highest point of the pulse amplitude of the second pulse and the time corresponding to the highest point of the pulse amplitude of the fourth pulse is less than a preset threshold. The ratio of the pulse width of the second pulse at the first height to the pulse width at the second height is greater than the ratio of the pulse width of the fourth pulse at the first height to the pulse width at the second height.

4. The method according to claim 1 or 3, characterized in that, Based on the test results, maintenance work is performed on the lightning protection device, including: When the lightning protection device malfunctions, the corresponding switch remains open, maintenance and replacement information is generated, and the maintenance and replacement information is sent to the target object. When the lightning protection device is functioning normally, the corresponding switch is switched to the closed state, a work completion notification is generated, and the work completion notification is sent to the target object.

5. The method according to claim 3, wherein, Also includes: In response to a notification that the repair or replacement of the target object is complete, the corresponding switch is switched to the closed state.

6. The method for hot-line work on a lightning protection device for medium and low voltage according to claim 4, characterized in that, The maintenance and replacement information includes the location information of the corresponding lightning protection device.

7. A method for live-line working on medium and low voltage lightning protection devices according to claim 1, characterized in that, The switch is a relay, which is controlled by a control circuit. The control circuit is connected to a remote control terminal through an internal communication module.

8. A method for live-line working on medium and low voltage lightning protection devices according to claim 7, characterized in that, Test signals are collected by a current transformer at a second test point preset in the protection branch. The current transformer is connected to the control circuit through an energy metering chip.

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