KR100890837B1 - Air circuit breaker installed at a lightning safety circuit - Google Patents

Abstract

The present invention prevents the malfunction of the ACB's own control circuit by removing the surge voltage introduced by lightning from the ACB (Air Circuit Breaker) and prevents the malfunction of the ACB self-control circuit and protects other devices connected to the output line from the lightning. The present invention relates to a low voltage circuit breaker having a built-in circuit, and the present invention is connected to each phase (R, S, T) and a ground terminal (N) of a three-phase AC power supply, respectively, and each phase and ground of the three-phase AC power supply. A plurality of surge removal modules respectively connected to the terminals N for absorbing and removing surge voltages introduced by lightning strikes; A plurality of detectors for detecting whether a plurality of surge removal modules are damaged; A module breakdown controller for analyzing output signals of a plurality of detectors and generating a warning control signal to warn of a breakdown of the surge removing module; In accordance with the warning control signal generated from the module damage controller is provided with a warning unit for warning the outside of the surge removal module.

Low Voltage Circuit Breaker, Surge Absorber, Lightning, Safety Circuit, Surge Suppressor

Description

Air circuit breaker installed at a lightning safety circuit

1 is a block diagram of a low voltage circuit breaker incorporating a lightning safety circuit according to the present invention, in which a surge removing module for absorbing a surge voltage of an ACB is connected to a power line.

FIG. 2 is a circuit diagram illustrating an embodiment of the surge removing module of FIG. 1. FIG.

3 is a structural diagram showing a pattern of a lightning safety circuit in a printed circuit board (PCB).

Explanation of symbols for the main parts of the drawings

20, 30, 40, 50: first to fourth surge removing module

21, 31, 41, 51: surge suppression element (TNR)

D1 ~ D4: Detector (Diode) 60: Module Damage Controller

70: warning unit

The present invention relates to a three-phase (R, S, T) low-voltage air circuit breaker (ACB), more specifically to remove the surge voltage introduced by lightning, etc. in the air circuit breaker (ACB) The present invention relates to a low voltage circuit breaker with a built-in lightning protection circuit that prevents malfunction of the ACB control circuit and protects other equipment connected to an output line from lightning.

In general, a switchboard installed in an industrial building, a residential building and a public building is provided with an air circuit breaker (ACB) for controlling a power supply. This low voltage circuit breaker is connected to the power line, and when a lightning strike occurs, a surge voltage flows through the power line to damage the controller of the ACB itself or other devices connected to the ACB output, and also the life of the contact point. Shortening, of course, noise also caused the unit to malfunction.

Therefore, in order to solve the problems caused by the surge voltage caused by the lightning strike as described above, a mechanical surge absorber is separately mounted to the outside of the ACB or the switchboard to remove the surge voltage flowing through the power line due to the lightning strike. .

However, such a conventional method has a disadvantage in that it is cumbersome and inconvenient according to the additional installation of the surge absorber, and additional costs are generated due to the installation of a separate surge absorber.

Accordingly, the present invention has been proposed to solve various problems occurring in the conventional low pressure circuit breaker as described above.

An object of the present invention is to eliminate the surge voltage introduced by a lightning strike in an ACB (air circuit breaker) to prevent malfunction of the ACB's own control circuit and to protect other equipment connected to the output line from the lightning strike. It is to provide a low voltage breaker with a built-in lightning safety circuit.

Another object of the present invention is to add a circuit for detecting breakage of a TNR element to a separate protection fuse line of the TNR element at the time of breakage (short) of the surge suppression element (TNR element) for electrical surge removal. The present invention provides a low voltage circuit breaker with a built-in lightning safety circuit that detects a breakage and warns a breakage of the TNR element so that a user can easily recognize the breakage of the TNR element from the outside.

"Low pressure breaker with a built-in lightning safety circuit" according to the present invention for achieving the above object,

In the low voltage circuit breaker that supplies or cuts three-phase (R, S, T) AC power to the load side by opening and closing the contact using a main switch,

A plurality of surge removal modules connected to each phase and the ground terminal N of the three-phase AC power source, respectively, for absorbing and removing a surge voltage introduced by lightning;

A plurality of detectors for detecting whether the plurality of surge removing modules are damaged;

A module breakdown controller which analyzes the output signals of the plurality of detectors to determine whether the surge suppression module is damaged, and generates a warning control signal to warn of a failure of the surge removal module as a result of the determination;

It characterized in that it comprises a warning unit for warning the damage of the surge removal module to the outside according to the warning control signal generated from the module damage controller.

Here, a plurality of surge removal modules are respectively placed on the power input lines of the respective phase and ground terminals, and are connected in series with a surge suppression element (TNR element) for absorbing a surge voltage generated by the lightning strike, and a surge suppression element. Consists of a fuse for protecting the surge suppression element,

The plurality of detectors are each composed of a diode placed between the surge suppression element and the fuse to detect whether the surge suppression element is broken,

The warning unit is characterized in that the warning of the damage state of the surge removal module, when hearing.

According to the present invention, it is possible to prevent the malfunction of the ACB itself control circuit and to protect other devices connected to the output line from the lightning by removing the surge voltage introduced by the lightning.

In addition, it detects whether the surge suppression element (TNR element) is damaged for electrical surge removal, and warns when a breakage of the TNR element is detected so that the user can easily recognize whether the TNR element is damaged from the outside. There is an advantage.

Hereinafter, described in detail with reference to the accompanying drawings a preferred embodiment of the present invention. Before describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a block diagram of a low voltage circuit breaker incorporating a lightning safety circuit according to the present invention, in which a surge removing module for absorbing a surge voltage of an ACB is connected to a power line, and FIG. 2 is a surge of FIG. A circuit diagram showing an embodiment of a removal module.

Here, reference numeral 10 denotes a low voltage circuit breaker for supplying or interrupting three-phase (R, S, T) AC power to the load side by opening and closing the power side contact (contact A) and the load side contact (contact B). The main switch SW1 is shown, and reference numerals 20, 30, 40, and 50 are respectively connected to the respective phases and the ground terminal N of the three-phase AC power supply, and absorb the surge voltage introduced through the power line by lightning or the like. To remove the first to fourth surge removing modules.

The first surge removal module 20 is connected to the power input line of the R phase, and a surge suppression element (TNR element) 21 for absorbing the surge voltage introduced due to the lightning strike, and the surge suppression element 21. And a fuse 22 connected in series to protect the surge suppression element 21.

A second surge suppression module 30 is connected to the power input line of the S phase, a surge suppression element (TNR element) 31 for absorbing the surge voltage introduced due to the lightning strike, and the surge suppression element 31. And a fuse 32 connected in series to protect the surge suppression element 31.

A third surge suppression module 40 is connected to the power input line of the T phase, a surge suppression element (TNR element) 41 for absorbing the surge voltage introduced due to the lightning strike, and the surge suppression element 41. And a fuse 42 connected in series with the surge suppression element 41 to protect the surge suppression element 41.

A fourth surge suppression module 50 is connected to a power input line of the ground terminal N, a surge suppression element (TNR element) 51 for absorbing surge voltage introduced due to the lightning strike, and the surge suppression It is composed of a fuse 52 connected in series with the element 51 to protect the surge suppression element 51.

Reference numerals D1 to D4 denote diodes as detectors for detecting whether the first to fourth surge removal modules 20, 30, 40, and 50 are damaged.

Reference numeral 60 is used to analyze the output signals of the first to fourth detectors D1 to D4 and to warn the first to fourth surge removal modules 20, 30, 40, and 50 if they are damaged. A module breakage controller for generating a warning control signal is shown, and reference numeral 70 denotes a warning portion that warns the outside of the breakage of the surge removal module according to a warning control signal generated by the module breakage controller 60. Here, the warning unit 70 preferably warns of a broken state of the surge removal module by hearing.

Here, the first to fourth surge suppression modules 20, 30, 40, 50, the detectors D1 to D4, the module breakage controller 60, and the warning unit 70 may be referred to as lightning protection circuits. Can be.

In the low voltage circuit breaker with a built-in lightning safety circuit according to the present invention configured as described above, a surge voltage caused by a lightning strike on a power line when a lightning strike occurs in a state where the main switch SW1 (10) is closed (contact point A and contact point B). It flows in.

The first to fourth surge suppression modules 20, 30, 40 and 50 connected to the three phases R, S and T and the ground terminal N, respectively, are the main switches SW1 and 10 as described above. The surge voltage due to the lightning strike introduced through) flows to the surge suppression elements 21 and 31 respectively implemented therein, thereby removing the surge voltage introduced by the lightning strike. Herein, although the present invention describes that the surge voltage is generated only due to lightning, etc., the present invention is not limited to this, and it is to remove all surge voltages introduced through the power line for any reason. As a result, the surge voltage is removed, and since the surge voltage is removed by the electrical method, the surge voltage can be removed more stably than the surge voltage removal method by the conventional mechanical surge absorber.

At this time, by connecting each of the surge suppression elements (21) (31) (41) (51) in parallel as shown in Figure 2 by absorbing the residual surge voltage distributed between each line with respect to the ground line N phase to release to the ground, Effective removal of the surge voltage emitted to the output line via switch 10 is achieved. In addition, the unspecified surge voltage flowing into the input line while the low voltage circuit breaker is turned on is also normally absorbed and removed by the surge suppression elements 21, 31, 41, and 51, so that a surge absorber is separately provided outside the ACB. There is no need to install it.

In addition, fuses 22, 32, 42, and 52 are added to each of the surge suppression elements 21, 31, 41, and 51 in series, and the surge suppression elements 21, 31, 41 are added. The breakage of the 51 is prevented.

On the other hand, despite the protection of the surge suppression elements 21, 31, 41 and 51 through the fuses 22, 32, 42 and 52, as is well known, The surge suppression element may be broken by this.

Therefore, in the present invention, in order to detect when each surge removal module 20, 30, 40, 50 is broken while performing the surge voltage removal function, the surge suppression element and the fuse provided in each surge removal module Detectors using diodes D1 to D4 in series are provided between the respective circuits to detect whether or not each surge removal module is damaged.

Here, each of the detectors D1 to D4 generates a low signal when the corresponding surge removal module is normally connected, and generates a high signal when the corresponding surge removal module is damaged. Is detected and the detection signals R-1, S-1, T-1, and N-1 are transmitted to the module breakage controller 60. Here, the low signal and the high signal are just one embodiment for determining a signal, and it will be obvious to those skilled in the art to implement the above detection method in reverse.

The module breakage controller 60 analyzes the detection signal to determine which surge removal module of the plurality of surge removal modules is damaged, and if any particular surge removal module is damaged, alerts the outside. It generates a warning control signal for providing to the warning unit (70).

The warning unit 70 generates a warning sound using a buzzer in response to the provided warning control signal, or informs the outside that the surge removal module is visually damaged using a light emitting diode (LED) or a display (LCD). Here, the warning unit 70 preferably warns by distinguishing whether or not each surge removal module is broken.

Therefore, the user can easily know whether the surge removal module is damaged by using only the warning signal of the warning unit 70 without checking the damage state of each surge suppression element directly.

On the other hand, when several independent surge suppression elements (TNR elements) are connected in parallel for the purpose of absorbing a large amount of surge current, some of the independent TNRs are destroyed and shorted due to excessive surge current. In order to prevent the function of the lightning protection circuit of the whole city from being paralyzed and to maintain a part of the function, in the present invention, as shown in FIG. By connecting to an independent TNR, when some TNRs are broken, only the thickness-controlled circuit patterns (81 to 84) connected thereto are broken so that other TNRs perform normal operation. At this time, the power supply voltages of L1 and L2 are applied through the broken and shorted TNR. The voltage is detected through the connected detectors D1 to D4, and the detection signal is sent to the module damage controller 60 as well. Will be.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

According to the present invention as described above, by electrically absorbing the surge voltage introduced into the power line due to lightning, etc., the burden of mounting the existing physical surge absorber can be reduced, and the ACB own controller due to the surge voltage The effect is to protect other devices connected to the ACB output.

In addition, it detects whether the surge suppression element (TNR element) is damaged for removing the electrical surge voltage, and warns when a breakage of the TNR element is detected so that the user can easily recognize whether the TNR element is damaged from the outside. It also helps to ensure that.

Claims (5)

In the low voltage circuit breaker that supplies or cuts three-phase (R, S, T) AC power to the load side by opening and closing the contact using a main switch, A plurality of surge removal modules connected to each phase and the ground terminal N of the three-phase AC power source, respectively, for absorbing and removing a surge voltage introduced by lightning; A plurality of detectors for detecting whether the plurality of surge removing modules are damaged; A module breakdown controller configured to analyze output signals of the plurality of detectors and generate a warning control signal to warn of a breakdown of the surge removal module; Low voltage breaker with a built-in lightning safety circuit, characterized in that it comprises a warning unit for warning the damage of the surge removal module to the outside according to the warning control signal generated from the module breakage controller. According to claim 1, wherein the plurality of surge removal module, A plurality of surge suppression elements (TNR elements) connected to the power input lines of the respective phase and ground terminals and connected in series with the plurality of surge suppression elements for absorbing surge voltages introduced by the lightning; A low voltage circuit breaker with a built-in lightning safety circuit, characterized in that each of the plurality of fuses for protecting the surge suppression element. The surge suppressor of claim 2, wherein the plurality of surge suppression elements are connected in parallel to absorb surge voltages distributed between the three phase lines, and the plurality of fuses break only any surge suppression element among the plurality of surge suppression elements. A low-voltage circuit breaker with a built-in lightning safety circuit, in which the fuse connected thereto is disconnected to maintain the function of another surge suppression element. The low voltage circuit breaker of claim 1, wherein each of the plurality of detectors comprises diodes for detecting whether the surge removal module is damaged. The low voltage circuit breaker with a lightning safety circuit according to claim 1, wherein the warning unit visually and audibly warns of a damage state of the surge removing module.

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