JP2008269932A - Method and device for judging replacement time of surge protection apparatus, and surge protection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for judging a replacement time of a surge protection apparatus judging a replacement time of a surge protection apparatus surely by a simple constitution. <P>SOLUTION: In judging the replacement time of a surge protection apparatus suppressing a surge, a surge current flowing in the surge protection apparatus is judged by using a surge judging parameter Ps and a surge judging parameter threshold Psc (step S102). Then, the number of times the surge current flows in the surge protection apparatus is counted (step S103). Subsequently, the number of times the surge current has flowed, namely a surge occurrence number N, and a replacement time judging threshold Nc are compared (step S104). As a result, when N is greater than Nc (step S104: Yes), it is judged that the surge protection apparatus is in a replacement time (step S105). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for determining a replacement time of a surge protection device used to protect equipment and the like from a surge caused by lightning.

  For example, when an abnormal voltage due to a lightning surge is applied to an equipment device equipped with an electronic circuit or an electric circuit, the surge current is discharged to the ground side to protect the voltage applied to the electronic circuit or electric circuit of the equipment device. There is known a surge protection device that protects an electronic circuit or an electric circuit of an equipment device by being effective below a voltage. For example, in Patent Document 1, a lightning surge current flowing through a lightning arrester, that is, a surge protection device, is detected by a current detector, the detection result is sampled by an A / D converter, and a current time product value, that is, a central processing unit, An operation monitoring device is disclosed in which a cumulative value of electrical energy flowing through a lightning arrester is calculated, and the calculated value is compared with a predetermined threshold value to determine the degree of deterioration of the lightning arrester.

JP 2004-37169 A FIG.

  However, since the technique disclosed in Patent Document 1 uses a central processing unit (so-called microcomputer) and an A / D converter, there is a problem that the configuration becomes complicated and the cost becomes high. In addition, since the surge waveform is a steep impulse waveform, it is difficult to accurately determine the surge waveform, and as a result, it is difficult to accurately determine the cumulative value of the electrical energy flowing through the lightning arrester, that is, the surge protection device. It is. Therefore, it is difficult for the technique disclosed in Patent Document 1 to accurately grasp the degree of deterioration of the lightning arrester, that is, the surge protection device.

  Therefore, the present invention has been made in view of the above, and a surge protection device replacement time determination method and a surge protection device replacement time determination device capable of reliably determining the replacement time of the surge protection device with a simple configuration, An object of the present invention is to provide a surge protection device.

  In order to solve the above-described problems and achieve the object, the surge protection device replacement time determination method according to the present invention is configured to determine the replacement time of the surge protection device that suppresses the surge. The procedure for counting the number of times the surge current flows through the protective device, the procedure for comparing the number of times the surge current has flowed with a predetermined replacement time determination threshold value, and the number of times the surge current has flowed are: And a procedure for determining that it is time to replace the surge protection device when the replacement time determination threshold is exceeded.

  This surge protection device replacement time determination method counts the number of times surge current flows through the surge protection device, and when the number of surge current flows exceeds a predetermined replacement time determination threshold, Judge that it is time to replace the surge protection device. As a result, it is not necessary to obtain the cumulative value of the electric energy flowing through the surge protection device, and therefore it is possible to reliably determine the replacement time of the surge protection device with a simple configuration.

  As a desirable mode of the present invention, in the surge protection device replacement time determination method, it is preferable to determine whether or not the surge current has flowed based on a surge voltage suppressed by the surge protection device.

  As a preferred aspect of the present invention, in the surge protection device replacement time determination method, it is preferable to determine whether or not the surge current has flowed based on the current flowing through the surge protection device.

  In order to solve the above-described problems and achieve the object, the surge protection device replacement time determination device according to the present invention determines the replacement time of the surge protection device for suppressing a surge, Surge determining means for determining whether or not a surge current flows through the surge protection device, surge counting means for counting the number of times the surge current flows through the surge protection device, and the number of times the surge current flows Replacement time notification means for notifying that the replacement time determination threshold value indicating the replacement time of the protective device has been exceeded.

  This surge protection device replacement time determination device determines whether or not surge current has flowed through the surge protection device by means of surge determination, counts the number of times surge current has flowed into the surge protection device by means of surge counting, If the number of times the flow exceeds the replacement time determination threshold indicating the replacement time of the surge protection device, this is notified by the replacement time notification means. This makes it possible to know when to replace the surge protection device during maintenance and inspection of the surge protection device. As described above, according to the surge protection device replacement time determination device, it is possible to reliably determine the replacement time of the surge protection device with a simple configuration. Further, since it is not necessary to obtain the accumulated value of the electric energy flowing through the surge protection device, it is possible to reliably determine the replacement time of the surge protection device.

  In order to solve the above-described problems and achieve the object, the surge protection device replacement time determination device according to the present invention determines the replacement time of the surge protection device for suppressing a surge, Surge determining means for determining whether or not a surge current has flowed through the surge protection device, surge counting means for counting the number of times the surge current has flowed through the surge protection device, and a surge for displaying the number of times the surge current has flowed And a number display means.

  This surge protection device replacement time determination device determines whether or not surge current has flowed through the surge protection device by means of surge determination, counts the number of times surge current has flowed into the surge protection device by means of surge counting, Is displayed by the surge number display means. As a result, it is possible to know the number of times the surge current has flowed through the surge protection device, so that it is possible to know the replacement time of the surge protection device during maintenance and inspection of the surge protection device. As described above, according to the surge protection device replacement time determination device, it is possible to reliably determine the replacement time of the surge protection device with a simple configuration. Further, since it is not necessary to obtain the accumulated value of the electric energy flowing through the surge protection device, it is possible to reliably determine the replacement time of the surge protection device.

  As a desirable aspect of the present invention, in the surge protection device replacement time determination device, the surge determination means may be configured to determine whether the surge current flows through the surge protection device based on a surge voltage suppressed by the surge protection device. It is preferable to determine whether or not.

  As a desirable aspect of the present invention, in the surge protection device replacement time determination device, the surge determination means determines whether or not the surge current flows through the surge protection device based on a current flowing through the surge protection device. Is preferably determined.

  In order to solve the above-described problems and achieve the object, the surge protection device according to the present invention includes a surge protection means provided in a wiring from a power source, and whether or not a surge current has flowed through the surge protection means due to the occurrence of a surge. A surge determination means for determining whether or not, a surge counting means for counting the number of times the surge current has flowed into the surge protection means, and a replacement time determination in which the number of times the surge current has flowed indicates the replacement time of the surge protection device And replacement time notification means for notifying that the threshold value is exceeded.

  In this surge protection device, the surge determination means determines whether or not a surge current has flown into the surge protection means, the surge counting means counts the number of times the surge current has flowed into the surge protection means, and the number of times the surge current has flowed is determined. When the replacement time determination threshold indicating the replacement time of the surge protection device is exceeded, the fact is notified by the replacement time notification means. This makes it possible to know when to replace the surge protection means provided in the surge protection device during maintenance and inspection of the surge protection device. Thus, according to this surge protection device, it is possible to reliably determine the replacement time of the surge protection device with a simple configuration. Further, since it is not necessary to obtain the accumulated value of the electric energy flowing through the surge protection device, it is possible to reliably determine the replacement time of the surge protection device.

  In order to solve the above-described problems and achieve the object, the surge protection device according to the present invention includes a surge protection means provided in a wiring from a power source, and whether or not a surge current has flowed through the surge protection means due to the occurrence of a surge. Surge determining means for determining whether or not, surge counting means for counting the number of times the surge current has flowed to the surge protection means, and surge number display means for displaying the number of times the surge current has flowed. And

  This surge protection device determines whether or not surge current has flowed into the surge protection means by the surge determination means, counts the number of times surge current has flowed into the surge protection means by the surge counting means, and determines the number of times the surge current has flowed. Displayed by means of displaying the number of surges. As a result, the number of times the surge current has flowed through the surge protection means included in the surge protection device can be known, so that it is possible to know the replacement time of the surge protection device during maintenance and inspection of the surge protection device. Thus, according to this surge protection device, it is possible to reliably determine the replacement time of the surge protection device with a simple configuration. Further, since it is not necessary to obtain the accumulated value of the electric energy flowing through the surge protection device, it is possible to reliably determine the replacement time of the surge protection device.

  The surge protection device replacement time determination method, surge protection device replacement time determination device, and surge protection device according to the present invention can reliably determine the surge protection device replacement time with a simple configuration.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the best mode for carrying out the invention (hereinafter referred to as an embodiment). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. In the following, an example in which a surge protection device is provided inside the equipment will be described, but the location of the surge protection device is not limited to this.

  In the present embodiment, for example, the number of times surge current flows through the surge protection device due to the occurrence of surge due to lightning or the operation of an AC power supply switch, the number of times surge current flows is determined in advance. This is characterized in that it is determined that it is time to replace the surge protection device when the replacement time determination threshold is exceeded.

  FIG. 1 and FIG. 2 are explanatory diagrams illustrating the configuration of equipment including a replacement time determination device for a surge protection device according to the present embodiment. The equipment 20 is, for example, an automatic fee collection device arranged at the entrance of an expressway, a server for storing data, and the like, and includes a DC power supply circuit 23 and an electronic circuit 24. The electronic circuit 24 operates with power supplied from the DC power supply circuit 23. The DC power supply circuit 23 is supplied with 100 V AC via the input wiring 22 from, for example, an outlet plug 21 connected to the wiring 31 from the AC power supply 30 (for example, single-phase 100 V). The DC power supply circuit 23 generates a DC power supply necessary for driving the electronic circuit 24 and other devices (for example, a display device and a reading device) included in the facility device 20.

  A surge may enter the wiring 31 that connects the AC power supply 30 and the equipment 20. Here, surge means transient overvoltage and overcurrent in general, such as lightning, switching of distribution system, capacitive and inductive, load switching (inrush current and flyback), electrostatic discharge Caused by etc. A surge that has entered the wiring 31 may enter the DC power supply circuit 23 and the electronic circuit 24 provided in the equipment device 20 through the outlet plug 21 and the input wiring 22 and affect these operations.

  Therefore, in order to protect the DC power supply circuit 23 and the electronic circuit 24 included in the equipment 20 from surge, a surge that is a surge protection means is provided between the wiring 31 from the AC power supply 30 and the DC power supply circuit 23 and the electronic circuit 24. The protective device 10 is connected. In the present embodiment, the surge protection device 10 as a surge protection means is connected between the input wiring 22 connected to the AC power supply 30 and the common line 25 connected to the ground (GND).

  Here, the surge protection device 10 is used for protection of equipment and facilities from surges generated by lightning, electrostatic discharge, switching, etc., that is, transient excessive voltage. The surge protection device 10 is a voltage-dependent element and has a high resistance in a normal state, but limits the voltage by rapidly decreasing the resistance when the applied voltage exceeds a certain voltage.

  Examples of the surge protection device 10 include those composed of semiconductor elements such as varistors, Zener diodes, and silicon surge protection elements, and discharge-type devices such as gas surge arresters. In the present embodiment, the surge protection device 10 includes semiconductor elements 11A and 11B, and the semiconductor elements 11A and 11B are connected between the wiring 31 from the AC power supply 30 and the common line 25 connected to the ground. When the power source is a three-phase alternating current, a semiconductor element is disposed between the U-phase, V-phase, and W-phase lines and the ground.

  When a surge occurs and enters the wiring 31 from the AC power supply 30, the voltage applied to the surge protection device 10 exceeds the set voltage. Then, the resistances of the semiconductor elements 11A and 11B constituting the surge protection device 10 rapidly decrease, and a current flows from the wiring 31 to the common line 25 connected to the ground. As a result, the voltage of the wiring 31 that has risen due to the surge decreases. As a result, the voltage applied to the outlet plug 21 of the equipment device 20 is lower than the voltage (surge voltage) increased by the surge, so that the DC power circuit 23 and the electronic circuit 24 provided in the equipment device 20 are protected from the surge. The

  When a surge current (surge current) flows through the surge protection device 10, the characteristics of the surge protection device 10 change. For this reason, when the change in the characteristics of the surge protection device 10 exceeds the allowable range, the surge protection device 10 is replaced. In order to determine the replacement time of the surge protection device 10, the equipment 20 according to the present embodiment is a surge protection device replacement time determination device (hereinafter referred to as a replacement time determination device) for determining the replacement time of the surge protection device 10. 1 is provided. Next, the configuration of the replacement time determination device 1 will be described.

  The replacement time determination device 1 includes a comparator 2 that is a surge determination means, a counter 3 that is a surge count means, an LED 4 that is a replacement time notification means, and resistors 5 and 6 that are voltage voltage dividing elements. Composed. The comparator 2, the counter 3, and the LED 4 are supplied with power for operating them from the DC power supply circuit 23. The surge protection device 10 can suppress the surge voltage below an allowable value, but cannot reduce the surge voltage to zero. Therefore, when the surge voltage is suppressed by the surge protection device 10, the suppressed peak value remains in the wiring 31 and enters the input wiring 22 of the equipment 20 through the outlet plug 21.

  This replacement time determination device 1 acquires the peak value (peak surge voltage) of the surge voltage suppressed by the surge protection device 10 from the input wiring 22 and drops the acquired peak surge voltage by the resistors 5 and 6. . Then, the comparator 2 compares the reduced peak surge voltage V with a predetermined threshold voltage Vc, and when the reduced peak surge voltage V exceeds the threshold voltage Vc, the surge protection device 10 is reached. It is determined that a surge current has flowed once.

  The counter 3 counts and accumulates the number of times it is determined by the comparator 2 that the surge current has once flowed into the surge protection device 10. When the number N of surge currents flowing to the surge protection device 10 (the number of surge occurrences) exceeds a predetermined replacement time determination threshold Nc, the counter 3 lights or blinks the LED 4. Thus, when the surge protection device 10 is inspected, it is possible to easily and reliably know the replacement time of the surge protection device 10. Moreover, since the replacement time determination device 1 uses the resistors 5 and 6, the replacement time determination device 1 can be configured at low cost and can improve reliability. Further, it is not necessary to obtain the cumulative value of the electric energy flowing through the surge protection device 10, and the replacement time of the surge protection device 10 is determined based on the number N of occurrences of surges. be able to.

  Here, it is preferable to set the replacement time determination threshold Nc smaller than the replacement time determined by the specifications of the surge protection device 10. For example, the replacement time determination threshold Nc is set to a value of 80% to 90% of the replacement time determined by the specifications of the surge protection device 10. In this way, since the surge protection device 10 can be replaced while the characteristic change of the surge protection device 10 is small, the influence due to the characteristic change of the surge protection device 10 can be reliably avoided.

  The equipment 20a shown in FIG. 2 detects the surge current that has flowed through the surge protection device 10 by means of a CT ammeter 7 that is a current detection means. The surge current detected by the CT ammeter 7 flows through the resistors 5 and 6 to the common line 25 connected to the ground. Then, the voltage value dropped by the resistor 5 is input to the comparator 2. That is, the surge current detected by the CT ammeter 7 is converted into a voltage by the resistor 5.

  In the comparator 2, a voltage corresponding to the surge current (detected by the CT ammeter 7) is compared with a predetermined current-corresponding threshold voltage Vc_i. The current-corresponding threshold voltage Vc_i is a threshold value for determining whether or not a surge current flows through the surge protection device 10, and when a voltage larger than the current-corresponding threshold voltage Vc_i is detected, the current corresponding threshold voltage Vc_i is sent to the surge protection device 10. It is determined that a surge current has flowed once.

  The CT ammeter 7 is an ammeter based on CT, that is, a current transformer method, and can measure current without contact. As a result, the CT ammeter 7 for detecting the surge current is insulated from the input wiring 22 connected to the AC power supply 30, so that the replacement time is determined from the influence of the voltage change of the input wiring 22 connected to the AC power supply 30. The device 1 can be protected.

  FIG. 3 and FIG. 4 are explanatory views showing the configuration of the equipment including the replacement time determination device for the surge protection device according to the modification of the present embodiment. The replacement time determination device 1a according to this modification has substantially the same configuration as the replacement time determination device 1 (see FIGS. 1 and 2), but a surge current flows to the surge protection device 10 by the surge number display means. The difference is that the number of times displayed is displayed. Other configurations are the same as those of the replacement time determination device 1.

  The replacement time determination device 1a included in the facility device 20b illustrated in FIG. 3 and the facility device 20c illustrated in FIG. Here, the equipment 20b shown in FIG. 3 detects a surge voltage, and the equipment 20c shown in FIG. 4 detects a surge current by the CT ammeter 7. The count number display device 4a displays the number of times the surge current has flowed to the surge protection device 10 counted by the counter 3, and for example, a liquid crystal display panel or an LED display panel can be used.

  Since the replacement time determination device 1 (see FIGS. 1 and 2) only notifies the replacement time of the surge protection device 10, when the replacement time of the surge protection device 10 is notified immediately after the inspection, the surge protection device 10 is notified. Replacement may be delayed. The replacement time determination device 1a according to the present modification displays the number of times surge current has flowed to the surge protection device 10 by the count number display device 4a. As a result, when the surge protection device 10 is inspected, it is possible to know the number of times the surge current has flowed into the surge protection device 10, so that it is possible to more accurately determine the replacement time of the surge protection device 10.

  FIG. 5 is a flowchart showing the procedure of the method for determining the replacement time of the surge protection device according to the present embodiment. In executing the surge protection device replacement time determination method according to the present embodiment, in step S101, the counter 3 of the replacement time determination device 1 included in the equipment device 20 shown in FIG. The number of times surge current flows to 10 (the number of occurrences of surge) N is set to zero.

  In step S102, the comparator 2 of the replacement time determination device 1 compares the surge determination parameter Ps with the surge determination parameter threshold value Psc. Thus, it is determined whether or not a surge current has flowed to the surge protection device 10. Here, the surge determination parameter Ps is a parameter for determining whether or not a surge current has flown into the surge protection device 10, and the surge suppressed by the surge protection device 10 that has been subjected to voltage drop by the resistors 5 and 6. The peak value of the voltage and the voltage corresponding to the surge current correspond to the surge determination parameter Ps. The surge determination parameter threshold value Psc is a threshold value for determining whether or not a surge current has flown into the surge protection device 10, and the above-described threshold voltage Vc and current-corresponding threshold voltage Vc_i correspond to the surge determination parameter Ps.

  When it is determined No in step S102, that is, when the comparator 2 determines that Ps ≦ Psc, no surge current flows to the surge protection device 10. In this case, since the number of times the surge current flows to the surge protection device 10 is not counted, the number N of occurrences of the surge does not increase. In this case, the replacement time determination device 1 continues to monitor whether or not a surge current flows to the surge protection device 10.

  When it is determined Yes in step S102, that is, when the comparator 2 determines that Ps> Psc, a surge current flows to the surge protection device 10. In this case, the counter 3 counts the number of times the surge current has flowed to the surge protection device 10. In step S103, the counter 3 sets a value obtained by adding 1 to the number N of surge occurrences as a new number N of surge occurrences. As a result, the number N of surge occurrences increases by one.

  Next, in step S104, the counter 3 compares the current number N of surge occurrences with a predetermined replacement time determination threshold Nc. When it is determined No in step S104, that is, when it is determined that the counter 3 satisfies N ≦ Nc, it is not time to replace the surge protection device 10. In this case, the replacement time determination device 1 continues to monitor whether or not a surge current flows to the surge protection device 10.

  When it is determined Yes in step S104, that is, when it is determined that the counter 3 is N> Nc, it is determined in step S105 that it is time to replace the surge protection device 10. In this case, in the replacement time determination device 1 shown in FIG. 1 or FIG. 2, the LED 4 that is the replacement time notification means is turned on or blinked. In the replacement time determination device 1a shown in FIG. 3 and FIG. 4, the number of times the surge current has flowed to the surge protection device 10 is displayed on the count number display device 4a. The determination in S105 will be made.

  6 and 7 are configuration diagrams illustrating a surge protection device including the replacement time determination device according to the present embodiment. The surge protection devices 100 and 100a shown in FIGS. 6 and 7 include the replacement time determination device 1 and the surge protection means 10 described above. Here, the surge protection device 100 shown in FIG. 6 detects a surge voltage, and the surge protection device 100 shown in FIG. 7 detects a surge current by the CT ammeter 7.

  The replacement timing determination device 1b included in the surge protection devices 100 and 100a shown in FIGS. 6 and 7 has substantially the same configuration as the replacement timing determination devices 1 and 1a described above, but the display 4b displays the LED 4 and the count number. The point which implement | achieves the function of the apparatus 4a differs. Other configurations are the same as those of the replacement time determination devices 1 and 1a described above. The display 4b has a function of displaying the number of occurrences of surge N and notifying that the number of occurrences of surge N has exceeded the replacement time determination threshold value Nc.

  The surge protection means 10 includes semiconductor elements 11A and 11B, and the semiconductor elements 11A and 11B are connected between the wiring from the AC power source and the ground. The surge protection means 10 is connected with an input terminal 101 for connecting the semiconductor elements 11A and 11B to the wiring from the AC power supply, and is connected with a ground terminal 103 for connecting to the ground. The surge protection devices 100 and 100a include a power supply terminal 102 for connecting a power supply for operating the comparator 2, the counter 3 and the display 4b included in the replacement time determination device 1b. As a result, the replacement time determination device 1b operates. Since the surge protection devices 100 and 100a include the replacement time determination device 1b, the replacement time can be self-diagnosed. Thereby, the commercial value of the surge protection devices 100 and 100a can be improved.

  FIG. 8 is a schematic diagram showing an example of remotely monitoring the replacement time of the surge protection device using the replacement time determination device according to the present embodiment. The replacement time determination devices 1_1, 1_2,... 1_n included in the facility devices 20_1, 20_2,... 20_n are connected to the communication line 51. In addition, the communication line 51 is connected to a replacement time monitoring device 52. The surge protection devices in the respective equipment 20_1, 20_2,... 20_n from the replacement time determination devices 1_1, 1_2,. The number N of surge occurrences 10_1, 10_2,. Then, the replacement time monitoring device 52 compares the acquired number of occurrences of surge N with the replacement time determination threshold value Nc, determines which surge protection device included in the equipment has reached the replacement time, and displays it on the monitor 53. . Thus, in this embodiment, it is possible to remotely monitor the replacement time of the surge protection device.

  Note that each of the replacement time determination devices 1_1, 1_2,... 1_n has a unique ID, and the replacement time monitoring device 52 uses the ID to replace each of the replacement time determination devices 1_1, 1_2,. Can be distinguished. In this example, the replacement time determination devices 1_1, 1_2,... 1_n need only include at least a surge determination unit and a surge counting unit, and do not need to include a replacement time notification unit or a surge number display unit. .

  As described above, in the present embodiment, the number of times the surge current flows through the surge protection device is counted, and when the number of times the surge current flows exceeds a predetermined replacement time determination threshold value, the surge protection device It is determined that it is time for replacement. This makes it possible to reliably determine the replacement time of the surge protection device with a simple configuration. In addition, the surge protection device replacement time determination device can be configured at low cost. Furthermore, it is not necessary to calibrate equipment constituting the surge protection device replacement time determination device.

  In particular, if the use is continued even after the characteristics of the surge protection device have changed, the power supply and the ground may be short-circuited. In the automatic fee collection device arranged at the entrance / exit of the expressway, if the power supply and the ground are short-circuited, the automatic fee collection device cannot be used until it is restored. In this embodiment, since it is possible to reliably determine the replacement time of the surge protection device, there is an advantage that a situation such as a short circuit between the power source and the ground can be prevented in advance.

  In addition, there is a method to replace the surge protection device depending on the usage time of the surge protection device, but in this method, since the replacement time of all surge protection devices comes at the same time, even if the number of occurrences of surges is different, All surge protection devices will be replaced at the same time. Then, it is necessary to stop all equipment, which is not preferable. In this embodiment, since the replacement time of the surge protection device is determined based on the number of times the surge current flows through the surge protection device, only the surge protection device that needs to be replaced needs to be replaced. Therefore, the equipment to be stopped can be minimized.

  As described above, the surge protection device replacement time determination method, the surge protection device replacement time determination device, and the surge protection device according to the present invention are useful for determining the replacement time of the surge protection device. It is suitable for determining the replacement time of the surge protection device reliably with a simple configuration.

It is explanatory drawing which shows the structure of the installation apparatus containing the replacement time determination apparatus of the surge protective device which concerns on this embodiment. It is explanatory drawing which shows the structure of the installation apparatus containing the replacement time determination apparatus of the surge protective device which concerns on this embodiment. It is explanatory drawing which shows the structure of the installation apparatus containing the replacement time determination apparatus of the surge protective device which concerns on the modification of this embodiment. It is explanatory drawing which shows the structure of the installation apparatus containing the replacement time determination apparatus of the surge protective device which concerns on the modification of this embodiment. It is a flowchart which shows the procedure of the replacement time determination method of the surge protective device which concerns on this embodiment. It is a block diagram which shows the surge protective device provided with the replacement time determination apparatus which concerns on this embodiment. It is a block diagram which shows the surge protective device provided with the replacement time determination apparatus which concerns on this embodiment. It is a schematic diagram which shows the example which monitors remotely the replacement time of a surge protection apparatus using the replacement time determination apparatus which concerns on this embodiment.

Explanation of symbols

1, 1a, 1b Surge protection device replacement time determination device 2 Comparator 3 Counter 4a Count number display device 4b Display device 5, 6 Resistance 7 CT ammeter 10 Surge protection device (surge protection means)
11A Semiconductor device 20, 20a, 20b, 20c Equipment 21 Outlet plug 22 Input wiring 23 Power supply circuit 24 Electronic circuit 25 Common line 30 AC power supply 31 Wiring 51 Communication line 52 Replacement time monitoring device 53 Monitor 100 Surge protection device 101 Input terminal 102 Power terminal 103 Ground terminal

Claims (9)

When judging when to replace a surge protection device that suppresses surge,
A procedure for counting the number of times a surge current flows through the surge protection device due to the occurrence of the surge;
A procedure for comparing the number of times the surge current flows with a predetermined replacement time determination threshold value,
If the number of times the surge current has flowed exceeds the replacement time determination threshold, a procedure for determining that it is the replacement time of the surge protection device;
A method for determining the replacement time of a surge protection device, comprising:   The method according to claim 1, wherein it is determined whether or not the surge current has flowed based on a surge voltage suppressed by the surge protection device.   The method according to claim 1, wherein it is determined whether or not the surge current has flowed based on a current flowing through the surge protection device. It is used to determine when to replace the surge protection device that suppresses surges.
Surge determining means for determining whether or not a surge current flows through the surge protection device due to the occurrence of surge;
Surge counting means for counting the number of times the surge current has flowed through the surge protection device,
Replacement time notification means for notifying that the number of times the surge current has flowed exceeds a replacement time determination threshold value indicating the replacement time of the surge protection device;
An apparatus for determining when to replace a surge protection device, comprising: It is used to determine when to replace the surge protection device that suppresses surges.
Surge determining means for determining whether or not a surge current flows through the surge protection device due to the occurrence of surge;
Surge counting means for counting the number of times the surge current has flowed through the surge protection device,
Surge number display means for displaying the number of times the surge current flows;
An apparatus for determining when to replace a surge protection device, comprising: The surge determination means includes
6. The surge protection device replacement time determination according to claim 4 or 5, wherein it is determined whether or not the surge current has flowed through the surge protection device based on a surge voltage suppressed by the surge protection device. apparatus. The surge determination means includes
6. The surge protection device replacement time determination device according to claim 4, wherein the surge protection device determines whether or not the surge current has flowed through the surge protection device based on a current flowing through the surge protection device. Surge protection means provided in the wiring from the power supply,
Surge determining means for determining whether or not a surge current flows through the surge protection means due to occurrence of surge;
Surge counting means for counting the number of times the surge current flows to the surge protection means,
Replacement time notification means for notifying that the number of times the surge current has flowed exceeds a replacement time determination threshold value indicating the replacement time of the surge protection device;
A surge protection device comprising: Surge protection means provided in the wiring from the power supply,
Surge determining means for determining whether or not a surge current flows through the surge protection means due to occurrence of surge;
Surge counting means for counting the number of times the surge current flows to the surge protection means,
Surge number display means for displaying the number of times the surge current flows;
A surge protection device comprising:

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