Method and device for monitoring high-frequency lightning current of lightning arrester

Abstract

The invention provides a lightning arrester high-frequency lightning current monitoring method. The lightning arrester high-frequency lightning current monitoring method comprises the following steps: receiving lightning current which flows between a grounding down lead of a lightning arrester body and a grounding grid and is collected by a lightning current high-frequency sensor each time under the condition of multiple lightning strokes; and according to the lightning current received each time, on a preset volt-ampere characteristic curve of the lightning arrester, a voltage value corresponding to each lightning current under the condition of multiple lightning strokes is obtained, and the starting time and the ending time of the lightning current received each time are counted, so that the lightning action time corresponding to each lightning current under the condition of multiple lightning strokes is obtained. The invention also provides a lightning arrester high-frequency lightning current monitoring device. According to the invention, multiple lightning performance can be monitored, and lightning overvoltage and current characteristics can be recorded completely and accurately.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a method and system for monitoring high-frequency lightning current of a lightning arrester. Background Art

[0002] The Southern Power Grid area is prone to thunderstorms. As the maximum thunderstorm day reaches 103 days each year, lightning protection for substations in the area is extremely important, especially for substations of 220kV and below. Although lightning protection measures have been taken in substations, there are still loopholes and deficiencies. For example, multiple lightning strikes causing circuit breaker breakage, circuit breaker external porcelain flashover, GIS equipment failure, lightning arrester failure and even explosion continue to occur and increase, seriously endangering the safety of people, power grids and equipment.

[0003] Therefore, in order to solve the problems caused by multiple lightning strikes, it is necessary to carry out multiple lightning performance monitoring. However, the prior art lacks equipment for monitoring multiple lightning performance, and it is impossible to completely and accurately record the lightning overvoltage and current characteristics. Summary of the invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a method and system for monitoring high-frequency lightning current of a lightning arrester, which can monitor multiple lightning performances and completely and accurately record lightning overvoltage and current characteristics.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a method for monitoring high-frequency lightning current of a lightning arrester, the method comprising the following steps:

[0006] Receive the lightning current flowing between the grounding down conductor of the lightning arrester body and the grounding grid, which is collected by the lightning current high-frequency sensor each time under multiple lightning strikes;

[0007] According to the lightning current received each time, the voltage value corresponding to each lightning current in the case of multiple lightning strikes is obtained on the preset volt-ampere characteristic curve of the lightning arrester, and the start time and end time of each lightning current received are statistically calculated to obtain the lightning action time corresponding to each lightning current in the case of multiple lightning strikes.

[0008] Wherein, the method further comprises:

[0009] Displays the lightning action time, lightning current and voltage value corresponding to each lightning current in the case of multiple lightning strikes.

[0010] Wherein, the method further comprises:

[0011] The lightning action time, lightning current and voltage value corresponding to each lightning current in the case of multiple lightning strikes are synchronously transmitted to the remote main control room.

[0012] Wherein, the current peak value of each lightning current is between 200A and 50kA.

[0013] The embodiment of the present invention further provides a lightning arrester high-frequency lightning current monitoring device, comprising:

[0014] A lightning current collection module is used to receive the lightning current flowing between the grounding down conductor of the lightning arrester body and the grounding grid collected by the lightning current high-frequency sensor each time under multiple lightning strikes;

[0015] The lightning current parameter monitoring module is used to obtain the voltage value corresponding to each lightning current in multiple lightning strikes on the preset volt-ampere characteristic curve of the lightning arrester based on each lightning current received, and to count the start time and end time of each lightning current received to obtain the lightning action time corresponding to each lightning current in multiple lightning strikes.

[0016] Among them, it also includes:

[0017] The lightning current parameter display module is used to display the lightning action time, lightning current and voltage value corresponding to each lightning current under multiple lightning strikes.

[0018] Among them, it also includes:

[0019] The lightning current parameter synchronous transmission module is used to synchronously transmit the lightning action time, lightning current and voltage value corresponding to each lightning current in the case of multiple lightning strikes to the remote main control room.

[0020] Wherein, the current peak value of each lightning current is between 200A and 50kA.

[0021] Among them, it is arranged at the lower part of the lightning arrester bracket.

[0022] Among them, its power frequency withstand voltage under dry and wet conditions is not less than 4kV, the power consumption is less than or equal to 50W / phase, and its insulation performance, electromagnetic compatibility performance, environmental performance, mechanical impact and protection performance should meet the requirements of DL / T1432.3.

[0023] Implementing the embodiments of the present invention has the following beneficial effects:

[0024] The high-frequency lightning current monitoring device for lightning arresters of the present invention receives the lightning current flowing between the grounding down conductor of the lightning arrester body and the grounding grid collected by the lightning current high-frequency sensor each time under multiple lightning strikes, so as to determine the voltage value and lightning action time corresponding to each lightning current under multiple lightning strikes, thereby being able to monitor the performance of multiple lightning strikes and completely and accurately record the lightning overvoltage and current characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0026] Figure 1 A flowchart of a method for monitoring high-frequency lightning current of a lightning arrester provided by an embodiment of the present invention;

[0027] Figure 2 A schematic structural diagram of a high-frequency lightning current monitoring device for a lightning arrester provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] like Figure 1 As shown in the figure, a method for monitoring high-frequency lightning current of a lightning arrester is proposed in an embodiment of the present invention, which is implemented on a high-frequency lightning current monitoring device of a lightning arrester. The method comprises the following steps:

[0030] Step S1, receiving the lightning current flowing between the grounding down conductor of the lightning arrester body and the grounding grid collected by the lightning current high-frequency sensor each time under the condition of multiple lightning strikes;

[0031] The specific process is as follows: first, a lightning current high-frequency sensor is deployed between the grounding down conductor of the lightning arrester body and the grounding grid (not shown);

[0032] Secondly, the high-frequency lightning current monitoring device of the lightning arrester is connected with the above-mentioned high-frequency lightning current sensor, so as to receive the current collected by the high-frequency lightning current sensor in real time. Once the lightning arrester body is struck by lightning, the high-frequency lightning current monitoring device of the lightning arrester can quickly receive the lightning current flowing between the grounding down conductor of the lightning arrester body and the grounding grid collected by the high-frequency lightning current sensor each time under multiple lightning strikes.

[0033] It should be noted that the high-frequency lightning current monitoring device of the lightning arrester is arranged at the lower part of the lightning arrester bracket. Its power frequency withstand voltage under dry and wet conditions is not less than 4kV, and its power consumption is less than or equal to 50W / phase. Its insulation performance, electromagnetic compatibility performance, environmental performance, mechanical impact and protection performance should meet the requirements of DL / T 1432.3. At the same time, the power supply of the high-frequency lightning current monitoring device of the lightning arrester should adopt an independent uninterruptible power supply mode, a special isolation transformer should be used inside the device, and the sealing performance should comply with the provisions of JB / T10492. The protection level is not lower than the provisions of EN 60529 / 10.91IP45.

[0034] Step S2, according to each lightning current received, on the preset volt-ampere characteristic curve of the arrester, obtain the voltage value corresponding to each lightning current under multiple lightning strikes, and count the start time and end time of each lightning current received to obtain the lightning action time corresponding to each lightning current under multiple lightning strikes.

[0035] The specific process is that, firstly, the arrester high-frequency lightning current monitoring device predefines the arrester's volt-ampere characteristic curve based on historical data, and the curve is fitted by the current peak value of the lightning current and the corresponding voltage value.

[0036] Secondly, the high-frequency lightning current monitoring device of the lightning arrester quickly obtains the voltage value corresponding to each lightning current under multiple lightning strikes from the volt-ampere characteristic curve of the lightning arrester according to the lightning current received each time. At the same time, the high-frequency lightning current monitoring device of the lightning arrester also records the start time and end time of each lightning current received, and obtains the lightning action time corresponding to each lightning current according to the calculation method of the difference between the end time and the start time. Of course, in order to facilitate the observation of monitoring parameters and their values, the high-frequency lightning current monitoring device of the lightning arrester displays the lightning action time, lightning current and voltage value corresponding to each lightning current under multiple lightning strikes in real time. Furthermore, the high-frequency lightning current monitoring device of the lightning arrester will also synchronously transmit the lightning action time, lightning current and voltage value corresponding to each lightning current under multiple lightning strikes to the remote main control room.

[0037] It should be noted that the high-frequency lightning current monitoring device of the lightning arrester has certain regulations on the current peak value collection of the lightning current, such as the current peak value of each lightning current is between 200A and 50kA.

[0038] like Figure 2 As shown in the figure, a lightning arrester high-frequency lightning current monitoring device is provided in an embodiment of the present invention, comprising:

[0039] The lightning current collection module 110 is used to receive the lightning current flowing between the grounding down conductor of the lightning arrester body and the grounding grid collected by the lightning current high-frequency sensor each time in the case of multiple lightning strikes;

[0040] The lightning current parameter monitoring module 120 is used to obtain the voltage value corresponding to each lightning current under multiple lightning strikes on the preset volt-ampere characteristic curve of the lightning arrester based on each lightning current received, and to count the start time and end time of each lightning current received to obtain the lightning action time corresponding to each lightning current under multiple lightning strikes.

[0041] Among them, it also includes:

[0042] The lightning current parameter display module is used to display the lightning action time, lightning current and voltage value corresponding to each lightning current under multiple lightning strikes.

[0043] Among them, it also includes:

[0044] The lightning current parameter synchronous transmission module is used to synchronously transmit the lightning action time, lightning current and voltage value corresponding to each lightning current in the case of multiple lightning strikes to the remote main control room.

[0045] Wherein, the current peak value of each lightning current is between 200A and 50kA.

[0046] Implementing the embodiments of the present invention has the following beneficial effects:

[0047] The high-frequency lightning current monitoring device for lightning arresters of the present invention receives the lightning current flowing between the grounding down conductor of the lightning arrester body and the grounding grid collected by the lightning current high-frequency sensor each time under multiple lightning strikes, so as to determine the voltage value and lightning action time corresponding to each lightning current under multiple lightning strikes, thereby being able to monitor the performance of multiple lightning strikes and completely and accurately record the lightning overvoltage and current characteristics.

[0048] It is worth noting that in the above system embodiment, the various system modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of the various functional modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0049] A person skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, such as ROM / RAM, disk, CD-ROM, etc.

[0050] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for monitoring high-frequency lightning current of a lightning arrester, characterized in that: The method comprises the following steps: Receive the lightning current flowing between the grounding down conductor of the lightning arrester body and the grounding grid, which is collected by the lightning current high-frequency sensor each time under multiple lightning strikes; According to the lightning current received each time, the voltage value corresponding to each lightning current in the case of multiple lightning strikes is obtained on the preset volt-ampere characteristic curve of the lightning arrester, and the start time and end time of each lightning current received are statistically calculated to obtain the lightning action time corresponding to each lightning current in the case of multiple lightning strikes.

2. The method for monitoring high-frequency lightning current of a lightning arrester according to claim 1, characterized in that: The method further comprises: Displays the lightning action time, lightning current and voltage value corresponding to each lightning current in the case of multiple lightning strikes.

3. The method for monitoring high-frequency lightning current of a lightning arrester according to claim 2, characterized in that: The method further comprises: The lightning action time, lightning current and voltage value corresponding to each lightning current in the case of multiple lightning strikes are synchronously transmitted to the remote main control room.

4. The method for monitoring high-frequency lightning current of a lightning arrester according to claim 1, characterized in that: The current peak value of each lightning current is between 200A and 50kA.

5. A lightning arrester high-frequency lightning current monitoring device, characterized in that: include: A lightning current collection module is used to receive the lightning current flowing between the grounding down conductor of the lightning arrester body and the grounding grid collected by the lightning current high-frequency sensor each time under multiple lightning strikes; The lightning current parameter monitoring module is used to obtain the voltage value corresponding to each lightning current in multiple lightning strikes on the preset volt-ampere characteristic curve of the lightning arrester based on each lightning current received, and to count the start time and end time of each lightning current received to obtain the lightning action time corresponding to each lightning current in multiple lightning strikes.

6. The high-frequency lightning current monitoring device for lightning arrester according to claim 5, characterized in that: Also includes: The lightning current parameter display module is used to display the lightning action time, lightning current and voltage value corresponding to each lightning current under multiple lightning strikes.

7. The high-frequency lightning current monitoring device for lightning arrester according to claim 6, characterized in that: Also includes: The lightning current parameter synchronous transmission module is used to synchronously transmit the lightning action time, lightning current and voltage value corresponding to each lightning current in the case of multiple lightning strikes to the remote main control room.

8. The high-frequency lightning current monitoring device for lightning arresters according to claim 7, characterized in that: The current peak value of each lightning current is between 200A and 50kA.

9. The high-frequency lightning current monitoring device for lightning arrester according to claim 5, characterized in that: It is arranged at the lower part of the arrester bracket.

10. The high-frequency lightning current monitoring device for lightning arrester according to claim 9, characterized in that: Its power frequency withstand voltage under dry and wet conditions shall not be less than 4kV, its power consumption shall be less than or equal to 50W / phase, and its insulation performance, electromagnetic compatibility performance, environmental performance, mechanical impact and protection performance shall meet the requirements of DL / T 1432.3.

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