KR100251598B1 - Lighting and surge-current detecting device - Google Patents

Abstract

PURPOSE: A lightning counter is provided to accomplish a stable system operation through a maintenance before there happens a failure, a wrong operation or a defect in the system. CONSTITUTION: A power source part(10) supplies a driving power source, namely a DC or an AC, through a power source line. The first breaker(20) is connected to the power source part(10) and cuts off the power source supplied from the power source part(10) if the power source is over a preset allowable current. A system(30) is driven by the power source supplied from the power source through the first breaker(20). The second breaker(40) is connected to the power source line between the first breaker(20) and the system, and cuts off the power source if the power source supplied through the power source line is over a preset allowable current. A lightening arrester(50) is composed of an MOV(Metal Oxide Varistor), a TVSS(Transient Voltage Suppressor), a gas filled glass tube, connected to the second breaker(40), not operated under a normal power source supply, but operated if an over-current is flowed thereinto due to a lightening, and removes the over-current due to the lightening deserted in to the power line through a ground, thereby reducing a voltage of a terminal of the system up to less than a withstand voltage. A lightening detecting part(60) is connected between the second breaker(40) and the lightening arrestor(50) and is composed of a comparator(62), a photo diode, and photo coupler(64). The lightening detecting part(60) is interlocked with operation of the lightning arrestor(50) when the over-current is deserted in the power source line, to increase a counter coefficient and display the same for a user to see it. A pilot lamp is connected between the second breaker(40) and the lightening arrestor(50) and displays the power source supplied from the power source part(10) according to the operation of the second breaker(40) and the first breaker(20).

Description

Lightning counter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system protection apparatus, and more particularly, to a lightning counter that protects a system from overcurrent caused by a lightning strike flowing through a power line or a communication line, and provides convenience for maintenance of the system.

In general, the term "system" refers to a device that uses an external power source as a power source for home appliances and expensive production and electrical and electronic operation facilities.

When an overcurrent occurs due to lightning in the power supplied to such a system, an expensive system is damaged or malfunctions, which causes a fatal effect on system operation.

Accordingly, in order to minimize the failure of such a system, an arrester 3 is installed between the power supply unit 1 and the system 2 as shown in FIG. 1 to protect the system 2 from an overcurrent caused by lightning. .

Such a conventional configuration protects the system 2 because the overcurrent caused by lightning strikes directly affecting the system 2 is extinguished through the ground by the operation of the arrester 3, but the lightning arrester 3 The surge voltage, which does not dissipate but flows below a certain voltage, flows into the system 2, causing indirect damage. That is, a minute surge voltage below a certain voltage that is not extinguished through the ground by the arrester 3 enters the system 2 and does not immediately indicate an external failure or failure, but internally causes data loss or stress accumulation that is fatal to the hardware. This can cause system 2 failure, such as damage or malfunction of the system 2.

However, at this time, the system user does not know exactly whether the failure of the system is caused by the cumulative stress of the fine surge voltage or the malfunction of the arrester, so it is difficult to solve the system failure factor.

The present invention is to solve such a problem, the object of the present invention is to detect the operating state of the lightning arrester to protect the system from the overcurrent caused by the lightning strike directly affects the system and the number of overcurrent inflow caused by the lightning strike so that the user can know The present invention provides a lightning counter that enables stable system operation through maintenance before failures such as system breakage and malfunction occur.

Figure 1 is a general circuit block diagram configured to protect the system from lightning strikes,

2 is a circuit diagram schematically showing a lightning counter according to an embodiment of the present invention;

3 is a circuit diagram schematically showing the lightning counter of FIG. 2 according to an embodiment of the present invention;

4 is a block diagram schematically illustrating a system using a lightning counter according to another embodiment of the present invention.

In order to achieve the above object, the present invention provides a power supply unit for supplying driving power, a first power cut-off unit for shutting off the power supplied from the power supply unit when the power supplied to the power supply unit is greater than the set allowable current, A power supply line connected in parallel with a system connected to a first power disconnection unit and driven by a power supply of the power supply unit supplied from the first power interruption to perform various functions, and a power line between the first power disconnection unit and the system; If the power supplied through the tongue for more than the set current, the second power cut-off unit to cut off the power supply, and is connected to the second power cut-off unit is grounded, and operates in the event of an over-current introduced by lightning strikes the power line to dissipate through the ground A first power source difference connected in parallel between an arrester protecting the system and the second power interrupter and the arrester; And a pilot lamp for displaying the power supply state from the power supply unit to the user according to the operation state of the power supply unit and the four power cutoff unit, and interlocked with the arrester to protect the operation state of the arrester and the lightning to the system. It further comprises a lightning detection unit for detecting the over-current inflow information and displays the detected information so that the user can know.

The lightning detection unit is connected in parallel between the second power cut-off unit and the lightning arrester and the switching unit changes the switching contact in conjunction with the operation of the lightning arrester, and the counter coefficient in accordance with the switching contact change of the switching unit and the user It characterized in that it comprises a counter for displaying so as to know.

In this case, the switching unit is connected between the second power cut-off unit and the lightning arrester and the light generating unit for generating a debt in conjunction with the lightning arrester, and is installed in proximity to the light generating unit and switched by the light generated from the light generating unit It is characterized in that the photocoupler including a light detection unit is changed contact.

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

2 is a circuit diagram schematically illustrating a lightning counter according to an embodiment of the present invention. The power supply unit 10, the first power interrupter 20, the system 30, the second power interrupter 40, It consists of the lightning arrester 50, the lightning detection part 60, and the pilot lamp PL.

The power supply unit 10 supplies a driving power of direct current or alternating current through a power supply line.

The first power cut-off unit 20 is connected to the power supply unit 10, and the contact is cut off when the power supplied from the power supply unit 10 is equal to or greater than a set allowable current to cut off the power supplied from the power supply unit 10.

The system 30 is connected to the first power interrupter 20 and is driven by the power supplied from the power supply unit 10 through the first power interrupter 20 to perform various functions.

The second power cut-off unit 40 is connected in parallel to the power line between the first power cut-off unit 20 and the system 30, and the contact is cut off when the power supplied through the power line exceeds the set allowable current. Shut off the supply.

Lightning arrester 50 is composed of a metal oxide varistor (MOV), a transient voltage suppressor (TVSS), a gas field (filled) glass tube, etc., is connected to the second power cut-off unit 40 and grounded. Although it does not operate, it operates when an overcurrent flows due to a lightning strike and extinguishes the overcurrent caused by a lightning strike on the power line through the ground, thereby reducing the terminal voltage of the system 30 to a withstand voltage or less, thereby preventing breakdown of the system 30. Protect the system 30.

The lightning detection unit 60 includes a comparator 61 having a non-inverting terminal (+) connected in parallel between the second power interrupting unit 40 and the arrester 50 and a variable resistor VR connected to the inverting terminal (−). And a switching unit of the photocoupler 64, which is composed of a photodiode 62 which is a light generating unit connected forward to the output terminal of the comparator 61 and a phototransistor 63 which is an optical detection unit installed in close proximity to the photodiode 61. It is composed of a counter 65 connected to the photocoupler 64, and increases the counter coefficient in conjunction with the operation of the arrester 50 when the overcurrent caused by lightning strikes the power line, and displays it for the user to know. .

The pilot lamp PL is connected in parallel between the second power interrupter 40 and the arrester 50, and according to the operating state of the first power interrupter 20 and the second power interrupter 40, Display the power supply status from 10) for the user to know.

An operation process of the lightning counter according to the first embodiment of the present invention configured as described above will be described.

In the normal state in which no overcurrent flows due to a lightning strike, a signal having a constant potential by the power supply unit 10 is induced in the non-inverting terminal + of the comparator 61 of the lightning detector 60. Then, the comparator 61 is at the "high" level since the potential induced at the non-inverting terminal (+) is higher than the reference potential induced at the inverting terminal (-) of the comparator 61 according to the adjustment of the variable resistance VR of the user. The photodiode 62 of the photocoupler 64 emits light according to the "high" level signal of the comparator 61. Accordingly, the phototransistor 73 of the photocoupler 64 is turned on and a signal of "high" level is applied to the counter 65.

In this state, when an overcurrent caused by lightning strikes the power line, the lightning arrester 50 operates to discharge the overcurrent caused by the lightning induced in the power line to ground to prevent breakdown of the system 30, thereby preventing the system 30 from breaking down. To protect.

At the same time, the non-inverting terminal (+) potential of the comparator 61 is almost enhanced to O [V], and the signal potential of the non-inverting terminal (+) of the comparator 61 is set by the user's variable resistance VR adjustment. The comparator 61 outputs a signal of the "low" level since it is lower than the inverting terminal (-) signal potential. Then, the photodiode 62 stops emitting light, and thus the phototransistor 63 is turned off. Accordingly, the signal applied to the counter 65 changes the signal of the "high" level from the "high" level, and when it changes from the "high" level to the "low" level, that is, when an overcurrent caused by lightning strikes. The counter 65 increments the counter count and displays the increased counter count so that the user can know. In addition, the counter 65 displays the time when the counter count is increased in addition to the counter count so that the user can know. Then, the user can not only know the operation state of the lightning arrester 50, that is, the number of times and the time when the overcurrent caused by lightning strikes the power line, but also indirectly, the display information of the counter 65. The number of times surge voltage remaining without being discharged into the system 30 can also be grasped. In addition, the counter 65 allows the user to know when the counted coefficient is equal to or greater than the set number of times, so that the user can immediately check the system before the system 30 causes catastrophic damage due to the accumulation of stress due to overcurrent inflow. Make it work.

In addition, the user can easily grasp the power supply state to the system 30 and the state of each contact point according to the lighting of the pilot lamp PL.

In the above-described embodiment, the comparator is installed at the front end of the switching unit 64, but the switching unit 64 may be directly connected in parallel between the second power interrupter 40 and the arrester 50 in parallel. In addition, although the switching unit 64 is formed as a photocoupler, the switching unit 64 may be formed as a semiconductor device such as a transistor or a relay.

Particularly, in the above embodiment, the photocoupler is formed by using the photodiode 62 as the light generator and the phototransistor as the photodetector. However, in addition to the phototransistor 63, photoconductive cells (Cds) may be used as the photodetector. In addition to the photodiode 62, the lamp or the arrester 50 itself may be used as the light generator.

FIG. 3 is a circuit diagram schematically illustrating a lightning counter according to another embodiment of the present invention. In the embodiment of FIG. 2, the lightning arrester 50 itself is used as a light generator that forms the photocoupler 64 as a switching unit. The phototransistor 63, which is an optical detection unit, is provided close to the arrester 50.

In this embodiment, the phototransistor 63 maintains a turn-off state in a state where no overcurrent flows due to a lightning strike, so that the counter 65 maintains a signal input of a "low" level.

However, when an overcurrent caused by a lightning strike flows into the system 30, the lightning arrester 50 operates to discharge the tube current caused by the lightning induced in the power supply line to ground, thereby reducing the terminal voltage of the system 30 to below the withstand voltage. The system 30 is protected by preventing dielectric breakdown of the system 30.

At the same time, the phototransistor 63 is turned on by the arc light generated by the operation of the arrester 50, and the signal potential of the counter 65 of the counter 65 is changed to a "high" level. Then, the counter 65 increases the counter coefficient according to the change in the signal level of the input terminal as in the embodiment of FIG.

At this time, the lightning arrester 50 is most preferably using a gas field glass tube to form a photocoupler, which is a switching element, and in the case of using an optical conductive cell as the light detector, in addition to simply increasing the counter coefficient, the output signal potential of the optical conductive cell As a result, the amount of overcurrent induced by lightning may also be measured.

4 is a block diagram schematically illustrating a system using the lightning counter of FIGS. 2 and 3 according to an embodiment of the present invention, which is installed between each power supply unit 10 and the system 30.

If damages are caused directly or indirectly by the overcurrent caused by lightning strikes in the systems performing the given tasks, the number of damages occurred for each system is counted. When it occurs, it raises a "system failure" alarm for the system, and also generates a "system danger" alarm when the counted number of indirectly damaged systems reaches a set number of times, thus preventing the user from causing catastrophic damage. Allows maintenance to be performed to provide stable system operation.

Each of the embodiments described above is the most preferred embodiment, and thus the technical spirit of the present invention is not limited thereto, and the present invention can be easily described from the above embodiments.

As described above, the present invention detects the operation state and the number of times of the lightning arrester protecting the system from the overcurrent caused by the lightning strikes affecting the system, so that the user can know the damage caused by the direct or indirect damage caused by the overcurrent induced by the lightning strike. Before failures such as system breakage and malfunction occur, maintenance can ensure stable system operation.

Claims (5)

A first power cut-off unit which is connected to the power supply unit for supplying driving power and the power supply unit and cuts off the power supplied from the power supply unit when the power supplied from the power supply unit is equal to or greater than a set allowable current; For the tongue which is driven by the power of the power supply unit supplied from the first power cutoff unit and performs various functions, the power connected in parallel to the power line between the first power cutoff unit and the system and supplied through the power line is set. A second power cut-off unit which cuts off the power supply when the current is higher than that; A parallel connection between the second power interrupter and the lightning arrester; and the first power interrupter and the second power interrupter And a pilot lamp for displaying a power supply state from the power supply unit according to an operation state so that a user can know the power supply unit, and interlocked with the arrester to detect an operating state of the arrester and information of inrush current due to lightning to the system. Lightning counter further comprises a lock detection unit for displaying the detected information so that the user can know. The switching unit of claim 1, wherein the lightning detection unit is connected in parallel between the second power interrupter and the lightning arrester, and the switching unit changes the switching contact in synchronization with the operation of the lightning arrester. Lightning counter, characterized in that it comprises a counter for displaying so that the user knows. The comparator according to claim 2, wherein the switching unit has one input terminal connected in parallel between the second power interrupter and the lightning arrester, a variable resistor for setting a reference potential is connected to the other input terminal, and an output terminal connected to the switching unit. Lightning counter further comprising. The light emitting device of claim 2, wherein the switching unit is connected between the second power interrupter and the lightning arrester in parallel to generate light in cooperation with the lightning arrester, and is installed in proximity to the light generator and generated from the light generator. Lightning counter, characterized in that the photocoupler including a light detector for changing the switching contact by the light. 5. The lightning counter according to claim 4, wherein the light detector is disposed close to the lightning arrester, the lightning arrester is disposed close to the lightning arrester, and the lightning arrestor is formed as the light generating unit, and a photocoupler is formed between the lightning arrester and the light detector.