JP2011019069A - Arrester management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress management man-hours and costs and to improve communication efficiency further.SOLUTION: The arrester management system is to be used in a communication system wherein a plurality of terminals 1 and a transmission unit 2 are connected through a pair of communication lines L, and includes an arrester 3 for bypassing a surge current to the ground when a surge voltage is applied to the communication lines L, and a display device 4 connected to the communication lines L for communicating with the arrester 3 and displaying the state of the arrester 3. The arrester 3 includes a varistor 31 which is conducted when the surge voltage is applied to the communication lines L and bypasses the surge current to the ground, a current sensor 32 for outputting a surge current value, a CPU 34 for comparing the surge current value with a threshold, detecting surge when the surge current value exceeds the threshold and neglecting the input of the surge current for a fixed period after the detection of the surge, and a memory 35 for storing the number of times of surge generation, and directly transmits surge generation number-of-times information through the communication lines L to the display device 4 when the fixed time elapses after updating the number of times of the surge generation.

Description

  The present invention relates to a lightning arrester management system.

  Conventionally, a plurality of terminals each having a unique address and the address of each terminal are stored, and a transmission signal including address data is transmitted to each terminal connected to each terminal via a pair of communication lines. A communication system including a transmission unit that controls communication between terminals is provided (see, for example, Patent Document 1).

  On the other hand, there is one in which a surge voltage is applied to an electronic circuit by providing a lightning arrester between a pair of power supply lines that supply power to the electronic circuit (see, for example, Patent Document 2).

  And as the maintenance and management means of the lightning arrester when the lightning arrester is applied to the communication system, a first means for displaying the state of the lightning arrester by providing a display means such as LED on the surface of the lightning arrester, Alternatively, a second means of providing a contact to the lightning arrester and transmitting the lightning arrester status to an external device by the output of the contact, or a separate lightning arrester management network is provided, and a current sensor detects the occurrence of surge current flowing through the lightning arrester. However, a third means for transmitting surge occurrence logs and statistical data to the host system is being used and studied.

JP 2007-288448 A JP 2004-273362 A

  Generally, in a communication system, each terminal is often provided in a distributed manner, and accordingly, the lightning arresters corresponding to each terminal are also provided in a distributed manner. In the first means, the display of the lightning arresters is visually confirmed. For this reason, maintenance and managers have to make regular patrols to check the display of the lightning arrester, which requires a large number of man-hours and poor efficiency.

  Further, the second means requires a separate system for communicating the contact output of the contacts provided in the lightning arrester to the management room or the like, and the system becomes large and expensive.

  In the third means, a lightning arrester management network needs to be provided separately from the communication network in which each terminal communicates with the transmission unit, which is expensive and difficult to introduce.

  As described above, in the conventional lightning arrester management system, maintenance man-hours and costs for the lightning arrester maintenance and management are large.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide a lightning arrester management system that can reduce the man-hours and costs for management and has good communication efficiency.

  The invention of claim 1 is a lightning arrester management system used in a communication system comprising one or more terminals and a transmission unit connected to each terminal via a pair of communication lines to control communication between the terminals. A surge arrester that bypasses the surge current to ground when a surge voltage exceeding a predetermined voltage is applied to the communication line, and a display that is connected to the communication line and communicates with the arrester and displays the status of the surge arrester. The lightning arrester has one end connected to a communication line and the other end connected to a ground, and when a surge voltage exceeding a predetermined voltage is applied to the communication line, the circuit protects the surge current and bypasses the surge current to the ground. The current detection means for outputting the surge current value flowing through the circuit protection means, the surge current value is compared with a predetermined threshold value, and a surge is detected when the surge current value exceeds the threshold value. Surge detection means that ignores surge current input exceeding the threshold for a certain period after detection, storage means that stores the number of surge occurrences detected by the surge detection means, and when a certain period of time has elapsed since the surge occurrence count was updated Transmitting means for transmitting surge occurrence number information to a display unit via a communication line, wherein the display unit receives the surge occurrence number information and displays the surge occurrence number.

  According to the present invention, the number of surge occurrences is transmitted from the lightning arrester to the display device via the communication line after a lapse of a predetermined time since the surge voltage is generated on the communication line, so that the noise due to the communication line surge is sufficiently reduced. Therefore, it is possible to reliably perform transmission without data loss and retransmission, and to improve communication efficiency.

  Furthermore, since the lightning arrester and the display device communicate using the existing communication line, it is not necessary to provide a separate network for the lightning arrester to transmit the number of occurrences of the surge to the display device, and the cost can be reduced. It is possible to know the states of a plurality of lightning arresters at distant positions at a time just by confirming the display of one display device, and to reduce the management man-hours.

  According to a second aspect of the present invention, in the first aspect of the present invention, the indicator includes a switch for outputting a request signal for requesting the surge arrester information on the number of occurrences of surge, and the surge arrester receiving the request signal The surge occurrence number information is transmitted to the request transmission source display device based on the signal.

  According to this invention, even if it is a case where communication between a lightning arrester and a display fails, the display can acquire the number of times of occurrence of surges by manually performing communication again.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the surge detecting means outputs a surge detection signal and a surge current value when the surge is detected when the surge is detected, and the memory Means stores the number of surge occurrences and the surge current value when a surge is detected, and the lightning arrester calculates the number of remaining surges that can be detected by the circuit protection means from the number of surge occurrences and the surge current value stored by the storage means. And a life number calculation means for transmitting to the display, wherein the display receives the surge detectable remaining number information and displays the surge detectable remaining number.

  According to the present invention, by predicting the lifetime of the circuit protection means included in the lightning arrester, it is possible to replace the circuit protection means in advance before the lifetime, thereby preventing malfunction of the lightning arrester due to failure of the circuit protection means or thermal destruction. it can.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the surge detection means outputs a surge detection signal and a surge current value when the surge is detected when the surge is detected, The storage means stores the number of surge occurrences and a surge current value when a surge is detected, and the lightning arrester is capable of detecting the remaining number of surges of the circuit protection means from the number of surge occurrences and the surge current value stored by the storage means. Calculates and outputs the lifetime of the circuit protection means, calculates the frequency of the frequency of occurrence of the surge from the surge occurrence pattern and outputs it, and calculates the life of the circuit protection means from the remaining number of surges that can be detected and the frequency of occurrence of the surge. A lifetime calculation means for transmitting lifetime information expressed in month and day to the display, the display receives the lifetime information and based on the lifetime information, the lifetime of the protection circuit Characterized in that it displayed in date.

  According to the present invention, it is possible to notify the maintenance and manager of the life of the protection circuit with a more easily understood index.

  As described above, according to the present invention, it is possible to reduce the management man-hours and costs, and to provide a lightning arrester management system with good communication efficiency.

The schematic block diagram of the communication system to which the lightning arrester management system in embodiment of this invention is applied is shown. The schematic block diagram of the communication system which applied the lightning arrester management system in the same as the above is shown. The explanatory view of the transmission signal used with the communications system to which the arrester management system same as the above is applied is shown. The data table which the memory of the lightning arrester management system same as the above has is shown. A surge current waveform diagram when the surge current is an oscillating current is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The lightning arrester management system in this embodiment is demonstrated using FIGS.

  As shown in FIGS. 1 and 2, the lightning arrester management system of this embodiment includes one or more control terminals 1A that are connected to a load (not shown) and receive control data to control the operation of the load, switches, sensors, and the like. One or more monitoring terminals 1B that receive monitoring inputs from the monitoring inputs and generate monitoring data for controlling the operation of each load, the addresses of the control terminals 1A and 1B, and the control terminals 1A and 1B It is used in a communication system comprising each monitoring terminal 1B and a transmission unit 2 connected via a pair of communication lines L. One end is connected to the communication line L and the other end is grounded. A lightning arrester 3 that conducts when a surge voltage exceeding the voltage is applied and bypasses the surge current to the ground, and a display 4 that is connected to the communication line L and communicates with the lightning arrester 3 and displays the state of the lightning arrester 3 It is equipped with a. Hereinafter, when the control terminal 1A and the monitoring terminal 1B are not distinguished, they are referred to as the terminal 1.

  The transmission unit 2 periodically transmits the transmission signal Vs to each terminal 1 by the time division multiplex transmission method. The transmission signal is composed of a bipolar signal and is transmitted to each terminal 1 via the communication line L. Here, as shown in FIG. 3A, the transmission signal Vs includes a start pulse ST indicating the start of signal transmission, mode data MD indicating the signal mode, and 8-bit address data for calling each terminal separately. A double pole (± 24V) composed of AD, control data CD for controlling the load, checksum data CS for checking transmission errors, and a return signal period WT which is a time slot for receiving a return signal from each terminal. It is a time division multiplexed signal, and data is transmitted by pulse width modulation.

  When the address data AD included in the received transmission signal Vs matches its own address, each terminal 1 takes in the control data CD from the transmission signal Vs, and returns a current mode signal in the return signal period WT of the transmission signal Vs. A signal is returned to the transmission unit 2. The return signal is a signal obtained by connecting a low resistance between the pair of signal lines L and short-circuiting the signal lines L, and the current flowing through the signal line L increases when the low resistance is connected. The transmission unit 2 receives the return signal by detecting an increase in the current flowing through the signal line L during the return signal period WT.

  When the transmission unit 2 transmits the control data CD to the desired terminal 1, the transmission is performed with the mode data MD as the control mode and the address of the desired terminal 1 as the transmission destination as the address data AD. The signal Vs is sent to the signal line L. Thereby, the desired terminal 1 receives the control data CD in the transmission signal Vs, and returns a return signal to the transmission unit 2 in the return period WT. The transmission unit 2 confirms that the control data CD has been transmitted to the desired terminal 1 based on the relationship between the returned return signal and the transmitted transmission signal Vs. The control terminal 1A controls the load according to the received control data CD, and the monitoring terminal 1B returns the monitoring data to the transmission unit 2 according to the received control data CD.

  By the way, the transmission unit 2 periodically transmits a transmission signal Vs in which the mode data MD is a dummy mode to each terminal 1 at normal times (always polling). Thereby, each terminal 1 generates its own power supply voltage by rectifying and smoothing the transmission signal from the transmission unit 2.

  On the other hand, when an event occurs in the monitoring terminal 1B due to a monitoring input from a switch or the like, the monitoring terminal 1B synchronizes with the start pulse ST of the transmission signal Vs (dummy mode) in FIG. ) Is returned to the transmission unit 2. At the same time, the monitoring terminal 1B sets its own interrupt flag. When the interrupt signal Vi is returned, the transmission unit 2 searches for the monitoring terminal 1B that has returned the interrupt signal Vi.

  Specifically, the mode data MD is set to the interrupt polling mode, and the transmission signal Vs is set while sequentially increasing the upper half of the address data AD (for example, the upper 4 bits when the address data AD is 8 bits). Send. The monitoring terminal 1B that has received the transmission signal Vs has its own address when the upper 4 bits of the address data AD of the transmission signal Vs correspond to the upper 4 bits of its own address and the interrupt flag is set. The lower half of the bits are returned to the transmission unit 2. In short, the lower 4 bits of the address are returned to the transmission unit 2 from the monitoring terminal 1B returning the interrupt signal Vi, and the address of the monitoring terminal 1B is acquired in the transmission unit 2. In this way, the transmission unit 2 searches the monitoring terminals 1B that have returned the interrupt signal Vi for each of the 16 units having the same upper 4 bits of the address, so that the monitoring terminal 1B can be found in a relatively short time. .

  When the transmission unit 2 acquires the address of the monitoring terminal 1B that has returned the interrupt signal Vi, the transmission unit 2 sets the mode data MD to the monitoring mode, and sends the transmission signal Vs using the acquired address as address data to the signal line L.

  Further, the monitoring terminal 1B returns monitoring data to the transmission unit 2 during the return period WT of the transmission signal Vs. Thereby, when an event occurs in the monitoring terminal 1B, monitoring data is transmitted from the monitoring terminal 1B to the transmission unit 2. The interrupt flag of the monitoring terminal 1B is canceled by transmitting a signal for instructing interrupt reset from the transmission unit 2 to the monitoring terminal 1B after transmission in the monitoring mode. When the transmission unit 2 knows the desired operation state of the control terminal 1A from the return signal, the transmission signal Vs in the monitoring mode may be transmitted to the control terminal 1A.

  The switch connected to each monitoring terminal 1B includes a plurality of circuit (for example, four circuits) switch contacts, and a load of a plurality of circuits (for example, four circuits) is connected to each control terminal 1A. Here, a load number for individually identifying a load and a switch contact is added to each terminal 1, and the address of the monitoring terminal 1B is obtained by combining the address of the control terminal 1A and the load number of the load. Together with the load number of the switch contact.

  As shown in FIG. 1, the lightning arrester 3 detects a current flowing in the varistor 31 by detecting a current flowing through the varistor (circuit protection means) 31 having one end connected to the communication line L and the other end connected to the ground. Current sensor (current detection means) 32 that measures and outputs current, A / D converter 33 that digitally converts analog data of the current value output from current sensor 32, and current that is output from A / D converter 33 A CPU 34 that performs various arithmetic processes such as comparing a value with a predetermined threshold value, a memory (storage means) 35 that stores the number of occurrences of surges, etc., and a high-pass filter 37 are provided at the input section. And a communication driver circuit 36 having an interface function for transmitting and receiving signals.

  The varistor 31 is turned on when a surge voltage higher than a predetermined voltage is applied to the communication line L, and bypasses the surge current to the ground.

  The current sensor 32 includes, for example, a coil surrounding a lead wire that connects the other end of the varistor 31 to the ground, and outputs an analog signal of a surge current value flowing through the lead wire.

  The A / D converter 33 digitally converts the analog signal of the surge current value input from the current sensor 32 and outputs the analog signal.

  The CPU 34 derives the number of surge detections of the varistor 31 based on the surge current value input from the A / D converter, and transmits a display signal including the surge detection number information to the display 4 via the communication driver circuit 36. (Transmission means).

  Here, the lightning arrester 3 and the display device 4 of the present embodiment directly communicate without going through the transmission unit 2. Specifically, the lightning arrester 3 superimposes a display signal having a higher frequency than the transmission signal Vs flowing through the communication line L on the transmission signal Vs. The display 4 captures only the display signal from the transmission signal via the high pass filter 41. In addition, when there are a plurality of lightning arresters 3, the display device 4 can identify which lightning arrester 3 the display signal is transmitted by adding an address for identifying the lightning arrester 3 to the display signal.

  The display unit 4 includes a communication drive circuit 41 provided with a high-pass filter (not shown) in the input unit, a control unit 44 that controls each unit in the display unit 4, and a display unit that includes an LCD or the like displayed by the control unit 44. 42 and an operation unit 43 including a switch, a button, and the like operated by the user, and displays the state of the lightning arrester 3 based on a display signal received from the lightning arrester 3.

  Hereinafter, the communication operation between the lightning arrester 3 and the display 4 when a surge voltage is applied to the communication line L will be described.

  First, when a surge voltage exceeding a predetermined voltage is applied to the communication line L, the varistor 31 conducts and bypasses the surge current to the ground. Next, the current sensor 32 detects a surge current value flowing through the varistor 31 and outputs analog data of the surge current value to the A / D converter 33. Then, the A / D converter 33 converts the input analog data of the current value into digital data and outputs it to the CPU 34.

  When the surge current value is input from the A / D converter 33, the CPU 34 compares the surge current value with a predetermined threshold value (1 kA in the present embodiment) as shown in FIG. Is detected, the occurrence of a surge is detected, the number of occurrences of the surge is read from the memory 35, the number of occurrences of the surge is incremented, and the updated number of occurrences of surge is stored in the memory 35 (surge detection means).

  Here, for example, when the surge current is an oscillating current that crosses the threshold value a plurality of times in a short time as shown in FIG. 5, the number of occurrences of the surge is incremented a plurality of times despite the occurrence of the surge once. Will be.

  Therefore, when the CPU 34 of the present embodiment first detects the occurrence of a surge once the surge current value exceeds the threshold, the occurrence of the surge is detected even if a surge current value exceeding the threshold is input for a certain period (for example, 300 ms). Does not recognize and does not increment the number of surge occurrences. That is, it is determined that the surge current value exceeding the threshold value within the predetermined time is due to one surge.

  The memory 35 stores the number of surge occurrences, and the number of surge occurrences is rewritten by the CPU 34.

  Next, every time the number of surge occurrences is updated, the CPU 34 reads out the number of surge occurrences stored in the memory 34 and transmits a display signal including the surge occurrence number information to the display 4 (automatic notification).

  Then, the control unit 44 of the display device 4 causes the display unit 42 to display the number of surge occurrences based on the surge occurrence number information included in the display signal received from the lightning arrester 3.

  Here, immediately after the occurrence of a surge, noise or the like due to a surge is generated on the communication line L, making communication difficult. Therefore, the lightning arrester 3 is generated at a certain time after the number of surge occurrences in the memory 35 is updated (occurred on the communication line L). By transmitting the display signal to the display device 4 after the noise or the like has been sufficiently reduced, the display signal can be transmitted reliably, eliminating the loss of data and the trouble of retransmission, and improving the communication efficiency.

  Furthermore, in the lightning arrester management system of the present embodiment, the state of the plurality of lightning arresters 3 can be confirmed on the display unit 42 of the display 4 located away from the lightning arresters 3, and the manager of the lightning arresters 3 It is no longer necessary to go around, and management costs can be reduced.

  In addition, since the lightning arrester 3 and the display device 4 communicate with each other using the existing communication line, it is not necessary to separately provide a system for managing the lightning arrester 3 and the cost can be reduced.

Further, when the operation unit 43 is operated by the user, the display unit 4 generates a request signal for requesting the number of occurrences of surge to the lightning arrester 3 by the control unit 44 and transmits the request signal via the communication driver circuit 41. Here, the request signal is a signal having a higher frequency than the transmission signal Vs flowing through the communication line L, and is superimposed on the transmission signal Vs.
And the lightning arrester 3 takes in a request signal from the said transmission signal Vs via the high-pass filter 37 provided in an input part. Next, the lightning arrester 3 that has received the request signal reads the surge occurrence number information from the memory 35 and sends a display signal including the surge occurrence number information.

  The indicator 4 receives the display signal transmitted from the lightning arrester 3, and displays the number of surge occurrences based on the surge occurrence number information included in the display signal.

  In this way, when the operation unit 43 provided in the display device 4 is operated (for example, a switch is pressed), the display device 4 can acquire information on the number of occurrences of surge from the lightning arrester 3, and the lightning arrester 3 Even if the above-described automatic notification for automatically transmitting a display signal including the number of occurrences to the display 4 fails due to the state of the communication line L or the like, communication can be manually performed again.

(Embodiment 2)
In the lightning arrester management system of the present embodiment, the information included in the display signal transmitted from the lightning arrester 3 to the display device 4 is different from that of the first embodiment, and other configurations are the same as those of the first embodiment. The reference numerals are attached and the description is omitted.

  The CPU 34 compares the surge current value output from the A / D converter 33 with a predetermined threshold value, detects the occurrence of the surge when the surge current value is higher than the threshold value, and generates the surge stored in the memory 35. The number of times of occurrence of the surge is read and incremented, and stored again in the memory 35. Further, the surge current value when the surge is detected is stored in the memory 35.

  That is, the memory 35 stores the number of surge occurrences updated by the CPU 34 and history information of surge current values.

  Here, the varistor 31 is deteriorated due to heat generation or the like of the surge current every time the varistor 31 becomes conductive and a surge current flows.

  For this reason, in the present embodiment, the CPU 34 determines the degree of deterioration of the varistor 31 for each surge occurrence from the surge occurrence count and surge current value history information stored in the memory 35, and derives the number of remaining detectable surges. Then, the display signal including the information on the remaining number of times that the surge can be detected and the number of occurrences of the surge is transmitted to the display 4 (life number calculation means).

  Then, the display 4 receives a display signal including information on the number of remaining surges that can be detected and information on the number of times of occurrence of surges, and displays the number of remaining surges that can be detected and the number of times of occurrence of surges based on the display signals.

  Therefore, in the lightning arrester management system of the present embodiment, by predicting the life of the varistor 31 included in the lightning arrester 3 (remaining number of possible surge detections) and replacing the varistor 31 in advance before the life, failure or thermal destruction of the varistor 31 occurs. Therefore, it is possible to prevent the malfunction of the lightning arrester 3 from occurring.

(Embodiment 3)
The lightning arrester management system of the present embodiment is different from the lightning arrester management system of the first embodiment in the information included in the display signal transmitted from the lightning arrester 3 to the display 4, and the other configurations are the same as those of the first embodiment. Therefore, a common code | symbol is attached | subjected and description is abbreviate | omitted.

  The CPU 34 compares the surge current value output from the A / D converter 33 with a predetermined threshold value, detects the occurrence of a surge when the surge current value exceeds the threshold value, and generates the surge stored in the memory 35. The number of times of occurrence of the surge is read and incremented, and stored again in the memory 35. Further, the surge current value when the surge is detected is stored in the memory 35.

  That is, the memory 35 stores the number of surge occurrences updated by the CPU 34 and history information of surge current values.

  Here, the varistor 31 is deteriorated due to heat generation or the like of the surge current every time the varistor 31 becomes conductive and a surge current flows.

  Therefore, in the present embodiment, the CPU 34 derives the remaining number of surge detectable from the history information of the number of occurrences of surge and the surge current value stored in the memory 35 and stores the remaining number of possible surge detection in the memory 35. (Life number calculation means).

  In other words, in addition to the number of surge occurrences and the history information of the surge current value, the memory 35 also stores the number of remaining surges that can be detected.

  Next, the CPU 34 calculates a surge occurrence frequency from the surge occurrence pattern (frequency calculation means). The surge occurrence frequency here is represented by, for example, the average number of surge occurrences per unit period. More specifically, when the number of surges detected in the past year is 24, the frequency of occurrence of surges is 2 times / month, and when the number of surges detected in one month is 12 (1 month 30 days), the frequency of surge occurrence is 0.4 times / day.

  Then, the CPU 34 calculates the life of the lightning arrester 3 (varistor 31) from the surge occurrence frequency and the remaining number of surge detectable remaining stored in the memory 35, and represents the life information expressed in the date, and the surge detectable remaining number information. And a display signal including information on the number of occurrences of surge is transmitted to the display 4.

  Subsequently, the display 4 displays the life of the lightning arrester 3 by date based on the life information included in the display signal received from the lightning arrester 3, the remaining number of times that surge detection is possible, and the number of occurrences of surge. , The remaining number of possible surge detections and the number of surge occurrences are displayed.

  At that time, for example, when the remaining number of surge detections is 6 and the surge occurrence frequency is 2 times / month, the life of the lightning arrester 3 is remaining 3 months, and the indicator 4 remains on March 0 of 0 years or today If the date is December 10, 2008, it will be displayed until March 10, 2009. Further, when the remaining number of surge detections is 150 and the frequency of surge occurrence is 0.4 times / day, the life of the lightning arrester 3 is 375 days remaining, and the indicator 4 is displayed on the date of the remaining 10th of January or today. Is December 10, 2008, it will be displayed until December 15, 2009.

  As a result, the maintenance manager of the lightning arrester 3 can know the lifespan of the lightning arrester 3 with an easy-to-understand index. By exchanging 3, it is possible to suppress the occurrence of the malfunction of the lightning arrester 3.

  In this embodiment, the frequency of occurrence of surges is expressed as an average of the number of surges generated per unit time, but in addition to the average number of surges generated per unit time, for example, a surge for each season The occurrence frequency of surges may be derived in consideration of the increase / decrease in occurrence and the difference in the number of surge occurrences depending on the installation location.

1 Terminal 2 Transmission Unit 3 Lightning Arrester 4 Display 31 Varistor (Circuit Protection Means)
32 Current sensor (current detection means)
33 A / D converter 34 CPU (surge detection means, lifetime number calculation means, frequency calculation means, lifetime period calculation means)
35 Memory (memory means)
36 Communication driver circuit (transmission means)
43 Operation part (switch)
L Communication line

Claims (4)

A lightning arrester management system used in a communication system including one or more terminals and a transmission unit that is connected to each terminal via a pair of communication lines and controls communication between the terminals,
A surge arrester that bypasses the surge current to the ground when a surge voltage exceeding a predetermined voltage is applied to the communication line, and an indicator that communicates with the arrester connected to the communication line and displays the status of the arrester,
The lightning arrester is connected to a communication line at one end and connected to the ground at the other end, and circuit protection means that conducts when a surge voltage exceeding a predetermined voltage is applied to the communication line and bypasses the surge current to the ground. The current detection means for outputting the surge current value flowing to the circuit protection means and the surge current value are compared with a predetermined threshold value, and when the surge current value exceeds the threshold value, a surge is detected and after the detection of the surge Surge detection means that ignores surge current input exceeding the threshold for a certain period of time, storage means for storing the number of occurrences of surge detected by the surge detection means, and information on the number of surge occurrences when a fixed time has elapsed after the surge occurrence count has been updated Comprising transmission means for transmitting to the display unit via a communication line,
The lightning arrester management system, wherein the indicator receives surge occurrence number information and displays the number of surge occurrences.   The indicator includes a switch for outputting a request signal for requesting the surge occurrence number information to the lightning arrester, and the surge arrester receiving the request signal sends the surge occurrence number information to the request transmission source indicator based on the request signal. The lightning arrester management system according to claim 1, wherein: The surge detection means outputs a surge detection signal and a surge current value when the surge is detected when the surge is detected, and the storage means outputs the number of surge occurrences and the surge current value when the surge is detected. Remember
The lightning arrester is provided with a life number calculation means for calculating the number of remaining surges that can be detected by the circuit protection means from the number of surge occurrences and the surge current value stored in the storage means, and transmitting to the display.
3. The lightning arrester management system according to claim 1, wherein the display unit receives information on the remaining number of surge detectable, and displays the remaining number of surge detectable. The surge detection means outputs a surge detection signal and a surge current value when the surge is detected when the surge is detected, and the storage means outputs the number of surge occurrences and the surge current value when the surge is detected. Remember
The lightning arrester calculates the number of remaining surges that can be detected by the circuit protection means from the number of surge occurrences stored in the storage means and the surge current value, and outputs the number of times that the surge can be detected. A frequency calculating means for outputting, and a life period calculating means for calculating the life of the circuit protection means from the remaining number of times that surge can be detected and the frequency of occurrence of surge and sending the life information expressed in the date to the display,
The lightning arrester management system according to any one of claims 1 to 3, wherein the display device receives life information and displays the life of the protection circuit in date based on the life information.

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