JP2013250211A - Cloud-to-ground discharge warning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cloud-to-ground discharge warning system capable of determining a possibility of a cloud-to-ground discharge and giving a warning against the cloud-to-ground discharge with high precision.SOLUTION: A cloud-to-ground discharge warning system includes a cloud-to-ground discharge detection device 21 which detects a cloud-to-ground discharge, and an electrostatic field detection device 22 which detects electric field intensity of an electrostatic field between clouds and the ground. The cloud-to-ground discharge warning system includes a control unit 26 as a warning output unit which outputs warning information on a rank on the basis of levels of detection signals output from both the detection devices 21 and 22. Further, the cloud-to-ground discharge warning system includes a control unit 26 as a rank adjustment unit which lowers the rank of the warning information output from the warning output unit when the detection level of the electrostatic field detection device 22 is lower than the detection level of the cloud-to-ground discharge detection device 21.

Description

  The present invention relates to a lightning strike warning system that warns by predicting the occurrence of a lightning strike.

  Generally, lightning approaches are detected in advance at outdoor work sites, such as towers and other high-rise building construction sites, and school buildings, playgrounds, stadiums, and golf courses where many people gather. Therefore, it is desired to evacuate and reduce damage at an appropriate time.

In order to cope with such a demand, for example, techniques as disclosed in Patent Document 1 and Patent Document 2 have been proposed.
For example, FIG. 1 of the first prior art described in Patent Document 1 discloses a plurality of field strength measuring instruments 1a to 1c for detecting ground field strength. The lightning strike risk is determined based on the field strength information from each of the field strength measuring instruments 1a to 1c, and weather radar information and high-rise weather information announced by an external organization such as the Japan Meteorological Agency, and the degree of the risk is determined. Displayed by the display device.

  For example, FIG. 1 of the second prior art described in Patent Document 2 shows an electric field intensity detection sensor 11 for detecting an electric field intensity in the air and a thundercloud discharge for detecting a sudden change in the electric field generated by a corona current of the thundercloud. A sensor 13 is disclosed. Based on the detection results of both sensors, the possibility of a lightning strike is predicted, and an alarm is issued when the possibility increases.

  Further, as the third conventional technique and the fourth conventional technique, the following is implemented. In the third prior art, a lightning strike detector is used alone. This lightning strike detector detects electromagnetic waves generated during a lightning strike. Based on the detection result, a warning is given that a lightning may occur at a work site or the like. In the fourth prior art, the electrostatic field strength detector alone is used to detect the field strength of the electrostatic field of the cloud directly above the work site or the like. Based on the detection results, a warning is given that there is a risk of lightning occurring at the work site.

Japanese Patent Laid-Open No. 10-268064 JP 2003-28968 A

However, these conventional configurations have the following problems.
In the first and second conventional configurations, the strength of the electric field strength or the sudden change in the electric field strength is detected by the electric field strength measuring device or the electric field strength sensor, and the detection result is used to determine the possibility of the occurrence of lightning. Yes. For this reason, it is possible to handle lightning that suddenly falls (hereinafter referred to as sudden lightning strikes), but the detection range is limited to a narrow area, and it is possible to detect distant thunderclouds and perform early lightning prediction responses. There was a problem that I could not.

  In the first and second conventional configurations, the determination of the possibility of lightning occurrence is made by adding weather radar information, high-rise weather information, and sudden change detection result of the electric field strength from the external engine to the detection result of the electric field strength. The accuracy is improved. However, even in this case, it is difficult to detect a moving thundercloud, and early lightning strike prediction response cannot be performed.

  On the other hand, in the third conventional configuration, an electromagnetic wave generated at the time of a lightning strike is detected by a lightning strike detector installed at a work site of a building, and the possibility of the occurrence of lightning is determined based on the detection result of the electromagnetic wave. To do. For this reason, for example, it is possible to detect even a long lightning at a distance of 100 km or more, and early lightning strike prediction response can be performed. However, since no electromagnetic wave is generated unless there is a lightning strike, for example, a sign of approaching It is not possible to deal with sudden lightning strikes without Moreover, since lightning strikes in a wide range are detected regardless of the distance of the lightning strike area, the detection is frequent and unnecessary alarms are frequent, resulting in poor reliability.

The fourth conventional configuration has the same problems as the first and second conventional configurations.
The present invention has been made paying attention to such problems existing in the prior art. The purpose of the present invention is to provide a lightning strike warning system that can determine the possibility of lightning strikes with high accuracy and cope with sudden lightning strikes, as well as enabling early warning.

  In order to achieve the above object, the present invention provides a lightning strike detection unit for detecting a lightning strike, an electrostatic field detection unit for detecting an electric field strength of an electrostatic field between a cloud and the ground, and detections output from both detection units. When there is a difference in level between the warning output unit for outputting the warning information of the rank based on the signal level and the level of the detection signal from the two detection units, the warning information A rank adjustment unit for adjusting the rank is provided.

  Accordingly, in the lightning strike warning system of the present invention, the occurrence of lightning strike is detected by the lightning strike detection unit, and the electric field strength of the electrostatic field between the cloud and the ground is detected by the electrostatic field detection unit. Then, based on the level of the detection signal output from both detection units, the warning output unit determines the rank of the warning information, and the ranked warning information is output from the warning output unit. At this time, the detection level of the electrostatic field detector is preferentially adopted, and warning information is output. Therefore, it is possible to determine and warn about the possibility of lightning with high accuracy based on static lightning detection information in the vicinity in addition to lightning detection information in the distance. It is possible to respond appropriately.

  In the above configuration, it is preferable that the rank adjustment unit lowers the rank of the warning information output from the warning output unit when the detection level of the electrostatic field detection unit is lower than the detection level of the lightning strike detection unit.

In this way, unnecessary warnings can be prevented by reducing the rank of the warning information, and the reliability of the warnings can be improved.
The said structure WHEREIN: It is preferable that the said rank adjustment part inputs precipitation information and lowers the rank of warning information according to the precipitation information.

In the above configuration, it is preferable that the rank adjusting unit inputs the wind information of the sky and lowers the rank of the warning information according to the wind information.
In the above-described configuration, it is preferable that the rank adjustment unit inputs a lightning warning and lowers the rank of the warning information according to the presence or absence of the lightning warning.

  In the above configuration, the rank adjustment unit inputs at least one of lightning warning, precipitation information, and wind information, and lowers the rank of the warning information according to the information, and at least one information of the information If is not entered, it is desirable not to perform rank down.

  The said structure WHEREIN: It is desirable for the said warning output part to notify warning information with respect to a portable terminal.

  As described above, according to the present invention, it is possible to determine and warn of the possibility of lightning occurrence with high accuracy based on lightning strike detection information and electrostatic field detection information.

The block diagram which shows the lightning strike warning system of one Embodiment. The flowchart which shows the operation | movement of the lightning strike warning system of FIG. The flowchart which shows the discrimination | determination operation | movement of the down condition of the warning rank in the flowchart of FIG. The flowchart which shows the 1st down operation | movement of the warning rank in the flowchart of FIG. The flowchart which shows the 2nd down operation | movement of the warning rank in the flowchart. The flowchart which shows the 3rd down operation | movement of the warning rank in the flowchart. The flowchart which shows the 4th down operation | movement of the warning rank in the flowchart. The figure which shows the lightning strike detection level. The figure which shows an electrostatic field detection level. The figure which shows the precipitation and wind direction level. The figure which shows a warning rank based on a lightning strike detection level and an electrostatic field detection level. The figure which shows the discrimination criteria at the time of the 1st down operation | movement of a warning rank. The figure which shows the discrimination criteria at the time of the 2nd-4th down operation | movement of a warning rank. The figure which illustrates the delivery content in the case of delivering warning information by mail.

Hereinafter, an embodiment of a lightning strike warning system embodying the present invention will be described with reference to the drawings.
As shown in FIG. 1, in the lightning strike warning system of this embodiment, as a lightning strike detection unit at a construction work site of a building such as a tower or a point around the construction work site (for example, a point within a radius of 2 to 10 km). A lightning strike detection device 21 is installed. The lightning strike detection device 21 captures a high-frequency component of an electromagnetic wave generated at the time of a lightning strike with an antenna even at a distance of 100 km or more, detects the level of the electromagnetic wave, and outputs a signal corresponding to the level. . Thereby, it is possible to determine whether or not lightning has occurred.

  An electrostatic field detector 22 as an electrostatic field detector is installed at a construction work site of a building or a nearby point (for example, a point within a radius of several kilometers) in the construction work site. The electrostatic field detector 22 is preferably closer to the work site than the lightning strike detector 21. Then, the electrostatic field detection device 22 detects the strength of the electrostatic field in the ground space between the cloud and the ground in the range of several kilometers and outputs a signal corresponding to the detection level. This makes it possible to determine whether the cloud in the sky is a thundercloud.

  Then, detection signals from the lightning strike detection device 21 and the electrostatic field detection device 22 are output to the control unit 26 via the processing units 24 and 25 of the control device 23, and the data is stored in the storage unit 27. .

  In this case, the processing unit 24 compares the detection signals from the lightning strike detection device 21 with a plurality of threshold values stored in the storage unit 27, and as shown in FIG. Output in stages. Level 1 shows a case where no electromagnetic wave is detected and a case where a very weak electromagnetic wave (for example, less than 500 V / m) is detected. Level 2 indicates a case where a medium level electromagnetic wave (for example, 500 to 1000 mV / m) is detected. Level 3 indicates a case where a high level electromagnetic wave (for example, exceeding 1000 V / m) is detected. As shown in FIG. 8, when the state in which the electromagnetic wave is not detected for a certain time (for example, 15 minutes) continues, a signal for canceling the storage of the lightning strike detection level in the storage unit 27 is output from the processing unit 24.

  Further, the processing unit 25 compares the detection signal from the electrostatic field detection device 22 with a plurality of threshold values stored in the storage unit 27, and as shown in FIG. Levels are divided into three stages, and signals indicating those levels are output. Level 1 indicates a case where no electrostatic field is detected or a case where an electrostatic field having a very low electric field strength (for example, less than 300 V / m) is detected. Level 2 shows a case where a static electric field (for example, 300 to 500 V / m) having a moderate electric field intensity is detected for a predetermined time (for example, 20 seconds or more). Level 3 indicates a case where an electrostatic field having a high electric field strength (for example, exceeding 500 V / m) is detected for a predetermined time (for example, 20 seconds or more). As shown in FIG. 9, when a static electric field is not detected or a very low level detection state continues for a certain time (for example, 10 minutes), a signal for canceling the storage of the electrostatic field detection level in the storage unit 27 is generated. Output from the processing unit 25.

  The control unit 26 of the control device 23 determines the rank of the warning information based on the level of the detection signal output from both the detection devices 21 and 22, and outputs the ranked warning information to the storage unit 27. The warning output part for memorize | storing is comprised. That is, as shown in FIG. 11, the control unit 26 as the warning output unit has three levels RN1 to RN3 as warning ranks according to the rank criteria stored in the storage unit 27 based on the detection signal levels LV0 to LV3. Determine and output warning information. For example, when the electrostatic field detection level LV is “0” and the lightning strike detection level LV is “1”, warning information with a warning rank RN “1” is output. Also, when the space electrostatic field detection level LV is “2” and the lightning strike detection level is LV “1”, warning information of warning rank RN “2” is output. Further, when the electrostatic field detection level LV is “3” and the lightning strike detection level LV is “1”, warning information with a warning rank RN “3” is output. As described above, the control unit 26 compares the lightning strike detection level with the electrostatic field detection level, and sets the higher level as the warning level.

  In this embodiment, the control unit 26 of the control device 23 performs the operation with priority given to detection by the electrostatic field detection device 22 over detection by the lightning strike detection device 21 under specific conditions. When the electrostatic field detection level based on the detection signal of the electrostatic field detection device 22 is lower than the lightning strike detection level based on the detection signal of the lightning strike detection device 21, the control unit 26 reduces the rank RN of the warning information. It constitutes a rank adjustment unit.

  Here, as shown by * 1 to 4 in FIG. 11, the control unit 26 as the rank adjustment unit determines whether the output warning information of the rank corresponds to the detection level comparison condition by the two devices 21 and 22. Determine if. If applicable, the rank of the warning information is lowered according to the adjustment method shown in FIGS. 12 and 13 stored in the storage unit 27.

  That is, as shown in FIG. 1, the control unit 26 as a rank adjustment unit includes precipitation information 28a such as rainfall and snowfall from an external organization that distributes weather data as code data, wind information 28b such as the wind direction above the sky, and lightning. The warning 29 is input. The precipitation information 28a is represented by precipitation echoes, and is composed of data indicating the amount of clouds such as thunderclouds and coordinate positions on the map, and represents the degree of the possibility of lightning strikes and the areas where such a possibility is likely. That is, when there is a lot of precipitation, the precipitation echo is strong, and when the cloud is a thundercloud, there is a high risk of a lightning strike. The wind information 28b is made up of vector data indicating the wind speed and wind direction in the sky (the height with the thundercloud, about 3 to 5 km above) at a plurality of specific points. The control unit 26 selects the wind information 28b of the precipitation echo occurrence point and uses it for the calculation. The lightning warning 29 is selected for a specific area (for example, within a radius of 100 km) centered on the work place or a specific designated area (for example, eastern Tokyo 23 wards).

  Then, the control unit 26 lowers the rank of the warning information according to the precipitation information 28a, the wind information 28b, and the lightning warning 29. That is, here, the processing unit 30 compares the precipitation information 28a and the wind information 28b with the threshold values stored in the storage unit 27, and sets the level of the down condition to minus (−) 1, as shown in FIG. The data is divided into five levels 1 to 4 and the data is output to the control unit 26.

  Level-1 indicates a case where a precipitation echo area does not exist in the specific area or a specific designated area centered on a work site, in other words, a case where a cloud such as a thundercloud does not exist. Level 1 shows a case where a precipitation echo area exists in the area and the distance from the work site or the like to the precipitation echo area is, for example, 30 to 40 km. Level 2 shows a case where a precipitation echo area exists in the predetermined area, the distance to the precipitation echo area is, for example, 20 to 30 km, and the wind in the sky is heading toward the work site. Level 3 indicates a case where a precipitation echo area exists in the predetermined area, the distance to the precipitation echo area is, for example, 10 to 20 km, and the wind in the sky is heading toward the work site. Level 4 indicates a case where a precipitation echo area exists in the above-mentioned area and the distance to the precipitation echo area is within 10 km, for example, regardless of the presence or absence of wind. That is, level 4 indicates the possibility that a lightning strike will occur without passing time at or near the work site.

  As shown in FIG. 1, the control unit 26 as the warning output unit displays a warning lamp 31 installed at a work site and the like, and plays an audio warning broadcast 32, and further to a portable terminal carried by the worker. By notifying by the mail distribution 33 or the like, warning information is notified. In this case, in the warning light 31, the warning information ranks RN1 to RN1 are displayed by selective lighting of the green light, the yellow light, and the red light. In the mail distribution 33, various information including a warning rank as shown in FIG. 14 is transmitted. The warning broadcast 32 has contents according to the mail delivery 33, and various information recorded in advance is reproduced and notified by sound from a loudspeaker.

Next, the operation of the lightning strike warning system configured as described above will be described.
In this lightning strike warning system, the operations shown in the steps of the flowcharts of FIGS. 2 to 7 (hereinafter simply referred to as “S”) are sequentially performed according to the program stored in the storage unit 27 under the control of the control unit 26 of the control device 23. Executed.

  That is, when a lightning strike detection signal is input from the lightning strike detection device 21 due to an electromagnetic wave accompanying a lightning strike in S1 of FIG. 2, any one of lightning strike detection levels 1 to 3 as shown in FIG. Is output. Furthermore, when an electrostatic field detection signal is input from the electrostatic field detection device 22 due to an electrostatic field between the cloud and the ground in S3, that is, an electrostatic field of static electricity over the work site or the like, from the processing unit 25 in the next S4, One of the signals indicating the electrostatic field detection levels 2 and 3 shown in FIG. 9 is output. When the electrostatic field is not detected or when the field strength of the electrostatic field is weak, a signal indicating the electrostatic field detection level 1 is output.

  Subsequently, in S5, any one of the warning ranks RN0 to RN3 is generated by the control unit 26 in accordance with the rank determination criterion shown in FIG. Here, the warning rank RN is processed so that the value of the higher one of the electrostatic field detection level and the lightning strike detection level is the value of the warning rank RN. In the next S6, it is determined whether or not a warning is necessary, that is, whether or not the warning rank RN is 0 or 1 to 3. If the warning rank RN is 0 and no warning is required, Returning to S1, the operations of S1 to S6 are repeated.

  On the other hand, if the warning rank RN is 1 to 3 in S6 and it is determined that a warning is necessary, the electrostatic field detection level and the lightning strike detection level are compared in the next S7. In subsequent S8, it is determined whether the electrostatic field detection level is lower than the lightning strike detection level and the warning ranks 1 to 3 need to be lowered.

  If it is determined in S8 that it is not necessary to lower the warning ranks 1 to 3, that is, the electrostatic field detection level is higher than or equal to the lightning detection level, and the rank reduction conditions * 1 to 4 in FIG. If not, the process proceeds to S9. Then, in S9, the warning rank RN is output from the control unit 26 without being lowered, and a lightning warning according to the warning rank is performed by notification by the warning lamp 31, the warning broadcast 32, the mail delivery 33, and the like. In the next S10, it is determined whether or not the detection signals from the lightning strike detection device 21 and the electrostatic field detection device 22 have changed. If the detection signal has changed, is the detection signal lowered in the subsequent S11? It is determined whether or not.

  If it is determined in S11 that the detection signal has decreased, it is determined in S12 whether or not a certain time (for example, 10 minutes) has passed in the detection signal decrease state. If the predetermined time has passed, the current lightning warning is canceled in the next S13. Thereafter, returning to S1, the operations of S1 to S13 are repeated. If it is determined in S11 that the level of the detection signal has not decreased, that is, if the level of the detection signal is maintained or the level is increased, the operations of S12 and S13 are not performed. Returning to S1, the operations of S1 to S13 are repeated. As described above, when the detection signal level is maintained, the warning rank is maintained.When the detection signal level is increased, the warning rank is immediately increased, and when the detection signal level is decreased. The warning rank is lowered after a certain time.

  On the other hand, if it is determined in S8 that the warning ranks 1 to 3 are required to be down, that is, the electrostatic field strength detection level is lower than the lightning strike detection level, and the rank down conditions * 1 to 4 in FIG. If so, the process proceeds to S14 in FIG. In S14, it is determined whether or not precipitation information 28a and wind information 28b are input from an external organization. If the input cannot be performed due to a failure of the input system from an external engine or the like, the process returns to S9 to issue a lightning warning without performing a warning rank down process. On the other hand, when the precipitation information 28a and the wind information 28b are input, in the next S15, any one of the detection levels −1 and 1-4 of the precipitation and wind information is detected from the processing unit 30 as shown in FIG. Is output.

  Next, in S16, it is determined whether or not the lightning warning 29 is input from the external engine. When the lightning warning 29 is input, in the next S17, whether the rank-down condition * 1, that is, the electrostatic field detection level LV in FIG. 11 is “0” and the lightning strike detection level LV corresponds to “1”. It is determined whether or not. If the rank-down condition * 1 is not met, the process proceeds to S18. If it is determined in S16 that input is impossible due to an input system failure from an external engine, the process proceeds to S18 without performing the determination operation in S17. In S18, it is determined whether or not the rank down condition * 2 of FIG. 11, that is, the electrostatic field detection level LV is “0” and the lightning strike detection level LV is “2”. If not, the routine proceeds to S19, where it is determined whether or not the rank down condition * 3 of FIG. 11, that is, whether the electrostatic field detection level LV is “0” and the lightning strike detection level LV is “3”.

  If it is determined in S17 that the rank-down condition * 1 is satisfied, the process proceeds to S20 in FIG. In S20, it is determined whether or not the detection levels of the precipitation information 28a and the wind information 28b are “−1”. If the detection level is “−1”, that is, if there is no possibility of a thundercloud reaching the work site, the process returns to step S1 without repeating the lightning warning and the operations after S1 are repeated. Is called.

  On the other hand, if the detection level is not “−1”, that is, if the detection level is “0 to 4”, the presence or absence of the lightning warning 29 is determined in S21. In the same manner as described above, without returning to a lightning strike, the process returns to step S1 and the operations after S1 are repeated. On the other hand, if there is a lightning warning in S21, the alarm rank is maintained at "1" in the next S22, and then the process proceeds to S9 in FIG.

  If it is determined in S18 of FIG. 3 that the rank-down condition * 2 is satisfied, the process proceeds to S23 of FIG. In S23, it is determined whether or not the detection levels of the precipitation information 28a and the wind information 28b are “0” or “1”. If the detection level is “0” or “1”, it means that the possibility of lightning strike to the work site is low, and the warning rank is lowered from “2” to “1” in the next S24. On the other hand, if the detection level of the precipitation information 28a and the wind information 28b is not "0" or "1" but "2" to "4", there is a high possibility that a thundercloud will attack, or Assuming that it has already reached, the lightning alarm rank is maintained at “2” in S25. Then, the process proceeds from S24 and S25 to S9 in FIG.

  Furthermore, if it is determined in S19 of FIG. 3 that the rank down condition * 3 is satisfied, the process proceeds to S26 of FIG. In S26, it is determined whether or not the detection levels of the precipitation information 28a and the wind information 28b are “0”. If the detection level is “0”, the warning rank is lowered from “3” to “1” in the next S27 because the possibility of lightning strike is low. On the other hand, if the detection levels of the precipitation information 28a and the wind information 28b are not “0”, it is determined whether or not the detection level of the precipitation / wind information is “1” in S28, and the detection level is “1”. When it is “1”, the warning rank is lowered from “3” to “2” in the next S29. If it is determined in S28 that the detection level is not “1”, that is, if the detection level is “2” to “4”, the alarm rank is maintained at “3” in S30. Then, the process proceeds from S27, S29 and S30 to S9 in FIG.

  On the other hand, when it is determined in S19 of FIG. 3 that the rank-down condition * 3 is not satisfied, that is, the electrostatic field detection level LV is “2”, the lightning strike detection level LV is “3”, and the rank-down condition * If it falls under 4, the process proceeds to S31 in FIG. In S31, it is determined whether or not the detection level of precipitation / wind information is “0” or “1”. If the detection level is “0” or “1”, the warning rank is determined in the next S32. Is reduced from “3” to “2”. On the other hand, if the detection level of precipitation / wind information is not “0” or “1” but is “2” to “4”, the alarm rank is maintained at “3” in S33. Is done. Then, the process moves from S32 and S33 to S9 in FIG.

  As described above, if the electrostatic field detection level in the vicinity (the area under the cloud) is lower than the lightning detection level in the area of 0 to 100 km expressed by electromagnetic waves, that is, lightning strikes to the work site or the vicinity thereof. When the possibility is lower than the possibility of a lightning strike at a distant location, after confirming with information from an external organization, the electrostatic field detection level is preferentially adopted and a level down warning is executed.

And according to this embodiment, the following effects can be acquired.
(1) In this lightning strike warning system, the occurrence of lightning strikes is detected by the lightning strike detection device 21, and the electric field strength of the electrostatic field between the cloud and the ground is detected by the electrostatic field detection device 22. And based on the level of the detection signal output from both the detection apparatuses 21 and 22, the rank of warning information is determined by the control part 26 as a warning output part, and the ranked warning information is output. For this reason, the possibility of a lightning strike can be appropriately recognized at a work site or the like.

  (2) In this lightning strike warning system, rank warning information based on the level of the detection signal output from the lightning strike detection device 21 and the electrostatic field detection device 22 is generated. When the warning information is generated, if there is a difference in level between detection signals from the detection devices 21 and 22, the rank of the warning information is adjusted according to the level of the electrostatic field detection device 22 with priority. Accordingly, it is possible to avoid the inconvenience of issuing warning information due to detection of a deep lightning even though the lightning strike condition near the work site is not established. For this reason, a lightning strike warning can be issued early and accurately.

  (3) In this lightning strike warning system, when the detection level of the electrostatic field detection device 22 is lower than the detection level of the lightning strike detection device 21, the rank of the warning information output from the warning output unit is the precipitation information 28a or wind Under the predetermined condition considering the information 28b and the like, the controller 26 is downed. Therefore, based on the lightning strike detection information in the remote area and the electrostatic field detection information in the neighboring area, the possibility of lightning occurrence can be determined early and with high accuracy depending on the situation, and warning lightning strikes and distant It is possible to appropriately respond to thunderclouds approaching from.

  (4) In this lightning strike warning system, the control unit 26 inputs a lightning warning 29 for a predetermined area including a work site, and the rank of the warning information is lowered according to the presence or absence of the lightning warning 29. It has become. For this reason, according to the presence or absence of the lightning warning 29, in other words, according to the situation within a predetermined area including the work site, the rank of the warning information can be accurately lowered, and unnecessary warnings can be reduced.

  (5) In this lightning strike warning system, the control unit 26 inputs precipitation information 28a and wind information 28b, and lowers the rank of warning information according to the precipitation information 28a and wind information 28b. For this reason, the rank of warning information can be accurately lowered according to the surrounding weather conditions, and unnecessary warnings can be reduced.

  (6) In this lightning strike warning system, the control unit 26 distributes the warning information to the portable terminal by e-mail 33. For this reason, warning information can be transmitted personally. Therefore, it is possible to avoid the possibility that a situation in which an alarm is not noticed occurs when the warning light 31 cannot be visually recognized at the work site or when the warning broadcast 32 cannot be heard.

  (7) In this lightning strike warning system, when the detection level from the lightning strike detection device 21 and the electrostatic field detection device 22 rises, it is immediately reflected in the warning rank. On the other hand, when the detection level from both the devices 21 and 22 decreases, the warning rank is lowered after a certain time has elapsed. Therefore, when the detection level goes up and down in a short cycle, it is possible to prevent the possibility that the warning issuance and the warning stop are repeated according to the hunting phenomenon. For this reason, useless confusion and complexity at a work site or the like can be suppressed.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
The level classification of the detection signal of the lightning strike detection device 21, the level division of the detection signal of the electrostatic field detection device 22, and the classification of level division such as precipitation information and wind information should be changed as appropriate. For example, the level classification of both devices 21 and 22 should be two or four or more, or the level classification of precipitation information and wind information should be two, three, four or six or more.

・ Change the rank classification of warning information to 2 levels or 4 levels or more.
The wind information 28b is directly detected using an anemometer or the like at the work site and the detected data is output to the control unit 26.

• Do not issue low rank warnings, only high rank warnings.
The control unit 26 is configured to lower the rank of the warning information according to at least one of lightning warning, precipitation information, and wind information.

  DESCRIPTION OF SYMBOLS 21 ... Lightning strike detection apparatus as a lightning strike detection part, 22 ... Electrostatic field detection apparatus as an electrostatic field detection part, 23 ... Control apparatus, 24, 25 ... Processing part, 26 ... Control part which comprises a warning output part and a rank adjustment part 27: Storage unit, 28a: Precipitation information, 28b ... Wind information, 29 ... Lightning warning, 30 ... Processing unit, 31 ... Warning light, 32 ... Warning broadcast, 33 ... Mail distribution.

Claims (7)

A lightning strike detector for detecting lightning strikes;
An electrostatic field detector that detects the strength of the electrostatic field between the cloud and the ground;
A warning output unit for outputting warning information of the rank based on the level of the detection signal output from the both detection units;
A lightning strike warning system comprising: a rank adjustment unit that adjusts the rank of warning information according to the level of the electrostatic field detection unit when there is a difference in level between detection signals from both detection units. The rank adjustment unit lowers the rank of the warning information output from the warning output unit when the detection level of the electrostatic field detection unit is lower than the detection level of the lightning strike detection unit. The described lightning strike warning system. The lightning warning system according to claim 2, wherein the rank adjustment unit inputs precipitation information, and lowers the rank of warning information according to the precipitation information. The lightning warning system according to claim 2 or 3, wherein the rank adjustment unit inputs wind information of the sky and lowers the rank of the warning information according to the wind information. The lightning warning system according to any one of claims 2 to 4, wherein the rank adjustment unit inputs a lightning warning and lowers the rank of warning information according to the presence or absence of the lightning warning. . The rank adjustment unit inputs at least one of lightning warning, precipitation information, and wind information, reduces the rank of warning information according to the information, and if at least one of the information is not input The lightning warning system according to claim 2, wherein rank down is not executed. The lightning warning system according to any one of claims 1 to 6, wherein the warning output unit notifies warning information to a mobile terminal.