KR100304252B1 - Auto-Switching Control Apparatus of Interlock Air Circuit Breaker - Google Patents

Abstract

According to the present invention, in the power failure generation mode, a first interruption signal is applied to the interruption coil unit of the normal air circuit breaker to separate the first fixed main contactor from the first movable main contactor, and a second input signal is used for the emergency. It is applied to the input coil portion of the air circuit breaker to control the emergency power is transferred to the load by contacting the second fixed main contactor and the second movable main contact, and in the power failure release mode, the second interruption signal to the emergency air circuit breaker The second fixed main contactor and the second movable main contactor are separated from each other, and a first input signal is applied to the input coil unit of the normal air circuit breaker to apply the first fixed main contactor 1 An interlocking air circuit breaker that controls the normal power to be switched to the load by contacting a movable main contactor. It relates to a switching control device.

According to the present invention, not only the changeover time is shortened as the transfer operation is automatically performed, but also when the manager is absent, immediate action is possible, and when the emergency breaker and the normal breaker are relatively far apart from each other. It is economically manageable and has the advantage of reliably opening and closing either of the two air circuit breakers at any particular moment without using expensive emergency power transfer switchgear.

Description

Auto-Switching Control Apparatus of Interlock Air Circuit Breaker}

The present invention relates to an automatic switching control device of an interlocking air circuit breaker, and more particularly, in the interlocking air circuit breaker, the emergency air circuit breaker and the normal air circuit breaker without the use of the emergency power transfer switch, the outage or power failure of the normal power supply Turn on and turn off the emergency air circuit breaker or normal air circuit breaker at any one time to ensure that only one air circuit breaker is on at any one time to prevent the normal and emergency power supply to the load. The present invention relates to an automatic switching control device of an interlocking air circuit breaker.

Normally, a circuit breaker is a device that protects the electrical system by operating current in a normal state and acting momentarily in the event of an accident in the power system.In addition to opening and closing a circuit in a normal state, the circuit of an abnormal state such as a short circuit state is also opened and closed. It can be said to be the biggest feature, and mechanically, it must have sufficient strength for earthquake, impact, etc., and the noise generated during opening and closing operation must be small, compact, easy to repair and check, This should not change.

In particular, the breaker must provide good conductorability when closed and must be thermally or mechanically robust to short-circuit or normal current. In addition, it should have good insulation during opening, and should have proper strength against voltage between earth and common terminal in case of abnormality, and it is possible to make current over rated breaking current without generating abnormal current at any time of closing condition. In addition to being able to cut off the circuit, a short circuit can be safely input in a short time while preventing the contactor from being welded at any point in the open state.

Here, the short circuit means that the power is directly connected to the positive electrode without current flowing to the load. The short circuit current is the largest by adding the DC component by the phase at the time of short circuit at the moment of occurrence, and decreases with time and lasts. The short circuit current, which is problematic due to the occurrence of the short circuit current, is a mechanical problem caused by the electromagnetic force at the moment of short circuit and a thermal problem caused by the flowing current.

The low voltage breaker has an air current breaker (ACB) that arcs the arc into the air and, like the air breaker, opens and closes the current in the air, but since the handler is not limited to the expert, the entire case is molded for safety. There are a circuit breaker (MCCB) made of a mold case, an earth leakage breaker that operates by detecting a ground fault, and a DC breaker that cuts off direct current by a current-limiting operation.

An arc is a connection between a conductor when an electric current is flowing and an insulator after an electric current is broken. Since an electric current is hard to flow suddenly and then break like a general physical property, an arc between the contacts Is generated to sustain the current between the contacts and disappears at the zero point of the current.

A number of prior applications are known in relation to the air circuit breaker, representative examples of the Republic of Korea Patent Application No. 94-024350, 'arc arc device of the air circuit breaker', Korea Patent Application No. 95-054980, 'air circuit breaker Arc Leakage Prevention System, Korea Patent Application No. 95-055095, Pumping Device of Air Circuit Breaker, Korea Patent Application No. 83-000207, Air Circuit Breaker, Korea Patent Application No. 85-0085145, Air Circuit Breaker ', US Patent Publication No. 03873950,' Air circuit breaker ', US Patent Publication No. 04497992,' Air circuit breaker ', US Patent Publication No. 04475021,' ARC CHUTE FOR AIR CIRCUIT BREAKER ', US Patent Publication No. 03555224 , 'ARC CHUTE FOR AN AIR CIRCUIT BREAKER', US Patent Publication No. 05003137, 'Switch', US Patent Publication No. 04457780, 'Electric contact materials', US Patent Publication No. 0347623,' Air circ uit breaker '.

In general, institutions that are heavily affected by power outages, such as hospitals, factories, and research institutes, often have emergency power sources such as large-capacity rechargeable batteries or self-generators to minimize such damages. A pair of circuit breakers are needed to open and close the power supply, and interlocking air circuit breakers are frequently used as circuit breakers for this purpose.

1 is an exemplary view showing an emergency power switching opening and closing system of a general interlock type air circuit breaker.

As shown in FIG. 1, in the conventional case, when power is normally supplied and a power failure state occurs, a normal air circuit breaker using an ATS (Automatic Transfer Switch) 3 interposed between the load and the air circuit breakers. The load connected to (1) is manually switched so as to be connected from the normal air circuit breaker 1 to the emergency air circuit breaker 2. On the contrary, when the power failure state is released while using the emergency power, the load connected to the emergency air circuit breaker 2 is connected from the emergency air circuit breaker 2 to the normal air circuit breaker 1 using the emergency power transfer switch 3. Manually change over.

As described above, when manually switching the interlocking type air circuit breaker through the emergency power switchgear (3), when a power failure occurs, the administrator who detects the power failure moves directly to the emergency power switchgear (3) and manually switches the switch. In addition to the unnecessarily large transfer time due to the operation, there is a problem that immediate action is difficult when the manager is absent.

In addition, when the emergency air circuit breaker 2 and the normal air circuit breaker 1 are relatively far apart from each other at a relatively long distance, an excessive installation cost is required in installing an interlock cable connecting the two air circuit breakers. There is a problem of inconvenient work and management, and there is an economic burden of using an expensive emergency power supply switchgear to reliably transfer either of the two air circuit breakers at any particular moment.

Accordingly, the present invention has been made to solve such a problem, in the interlocking air circuit breaker, the emergency air circuit breaker and the normal air circuit breaker without using the emergency power transfer switch to whether the normal power outage or power outage Therefore, in order to prevent the normal power supply and emergency power supply to the load at the same time, only one air circuit breaker is turned on at a moment, and the emergency air circuit breaker or the normal air circuit breaker is turned on and off electronically. It is an object of the present invention to provide an automatic switching control device of an interlocking air circuit breaker for automatic control.

1 is an exemplary view showing an emergency power switching opening and closing system of a general interlocking air circuit breaker,

Figure 2 is an exemplary view showing a preferred embodiment of the automatic switching control device of the interlocking air circuit breaker according to the present invention,

3 is a block diagram showing a first overcurrent relay of the present invention;

4 is a block diagram showing a second overcurrent relay of the present invention.

<Explanation of symbols for the main parts of the drawings>

11: normal power input terminal 12: first fixed main contactor

13: Normal power output terminal 14: First movable main contactor

21: emergency power input terminal 22: second fixed main contactor

23: emergency power output terminal 24: second movable main contactor

110: first cutoff coil part 120: first input coil part

130: first limit switch 140: normal power supply detection unit

210: second cutoff coil part 220: second input coil part

230: second limit switch 240: emergency power supply detection unit

300: mode selection unit 400: load

500: power switching control unit

In order to achieve the above object, the automatic switching control device of the interlocking air circuit breaker according to the present invention includes a first fixed main contactor electrically connected to the normal power input terminal and the normal power output terminal in the interlocking air circuit breaker. A first air circuit breaker which interrupts the normal power supply by extinguishing the arc generated by the interruption of the first movable main contactor connected to the control unit;

A second air circuit breaker that interrupts the emergency power by extinguishing an arc generated by the interruption of the second fixed main contact electrically connected to the emergency power input terminal and the second movable main contact electrically connected to the emergency power output terminal; And

In the power failure generation mode in which the normal power is applied and a power failure occurs, a first cutoff signal is applied to a trip coil of the first air circuit breaker to separate the first fixed main contactor from the first movable main contactor. After that, the second input signal is applied to the input coil of the second air circuit breaker to control the emergency power to be switched to the load by contacting the second fixed main contactor with the second movable main contactor, and the emergency power supply In the power failure release mode in which the normal power is applied, the second cutoff signal is applied to the cutoff coil part of the second air circuit breaker to separate the second fixed main contactor from the second movable main contactor. The first fixed main contactor and the first movable main contactor are applied by applying a first input signal to a closing coil of the first air circuit breaker. It is characterized by including a power transfer control unit for controlling such that the normal power transfer to the load by tip.

here. The present invention provides a first limit switch for generating a first interruption completion signal by contact with the first movable main contact at a point where the first movable main contact is separated from the first fixed main contact and electrically insulated. ; And a second limit switch for generating a first interruption completion signal by contact with the second movable main contact at a point where the second movable main contact is separated from the second fixed main contact and electrically insulated. It is preferable to include.

In addition, the present invention, the normal power supply detection unit for detecting whether the normal power is applied by detecting the secondary voltage of the transformer connected to the normal power supply; And an emergency power application sensing unit configured to sense whether the emergency power is applied by sensing the secondary voltage of the transformer connected to the emergency power.

The present invention receives the respective detection signals from the normal power supply sensing unit and the emergency power supply sensing unit, selects a power failure generation mode when the normal power is applied and a power failure occurs, and the emergency power is applied. The apparatus may further include a mode selector for selecting the power failure release mode when the normal power is applied.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the automatic switching control device of the interlocking air circuit breaker according to the present invention.

Figure 2 is an exemplary view showing a preferred embodiment of the automatic switching control device of the interlocking air circuit breaker according to the present invention.

As shown in FIG. 2, the preferred embodiment of the present invention includes: a first fixed main contactor 12 electrically connected to a normal power input terminal 11 for receiving normal power;

A first movable main contactor (14) electrically connected to the normal power output terminal (13) for outputting the normal power supply;

As the first blocking signal for shutting off the normal power is input, the first movable main contactor 14 is separated from the first fixed main contactor 12 by the operation of the solenoid method. 11) a first blocking coil unit (110) for interrupting the energization between the normal power output terminal (13);

When the first input signal for energizing the normal power is applied, the first fixed main contactor 12 and the first movable main contactor 14 are brought into contact with each other by a solenoid type of operation so that the normal power input terminal 11 is connected. And a first input coil unit 120 for energizing between the normal power output terminal 13 and the normal power output terminal 13.

A first blocking completion signal is generated when the first movable main contactor 14 contacts the first movable main contactor 14 at a point where the first movable main contactor 14 is separated from the first fixed main contactor 12 and electrically insulated. A first limit switch 130;

A normal power supply detecting unit (140) for detecting whether the normal power is applied by sensing the secondary voltage of the transformer connected to the normal power source;

A second fixed main contactor 22 electrically connected to an emergency power input terminal 21 for receiving emergency power;

A second movable main contactor (24) electrically connected to the emergency power output terminal (23) for outputting the emergency power;

The second movable main contactor 24 is separated from the second fixed main contactor 22 by a solenoid type operation in response to receiving a second blocking signal for shutting off the emergency power. A second blocking coil unit 210 which cuts off electricity between the 21 and the emergency power output terminal 23;

When the second input signal for energizing the emergency power is applied, the second fixed main contactor 22 is brought into contact with the second movable main contactor 24 by a solenoid type operation so that the emergency power input terminal 21 is connected. And a second input coil unit 220 for energizing the emergency power output terminal 23;

A first blocking completion signal is generated by contact with the second movable main contactor 24 at the point where the second movable main contactor 24 is separated from the second fixed main contactor 22 and electrically insulated. A second limit switch 230;

An emergency power application sensing unit 240 for sensing whether the emergency power is applied by sensing a secondary voltage of a transformer connected to the emergency power;

After receiving the respective detection signals from the normal power supply detecting unit 140 and the emergency power supply detecting unit 240, the normal power is applied and if a power failure occurs, the power failure generation mode is selected, and the emergency power is applied. A mode selector 300 for selecting a power failure release mode when the normal power is applied;

In the power failure generation mode, the first blocking signal is applied to the first blocking coil unit 110 to separate the first fixed main contactor 12 from the first movable main contactor 14. When the first blocking completion signal is input from the limit switch 130, the second input signal is applied to the second input coil part 220 to provide the second fixed main contactor 22 and the second movable main contactor. The emergency power is controlled to be switched to the load 400 by contacting the 24, and in the power failure release mode, the second blocking signal is applied to the second blocking coil unit 210 to control the second fixed main contactor ( When the second blocking completion signal is inputted from the second limit switch 230 as the second movable main contactor 24 is separated from the second movable main contactor 22, the first input signal is transmitted to the first input coil unit 120. ) Is applied to the first fixed main contact And a power switching controller 500 for controlling the normal power to be transferred to the load 400 by bringing the ruler 12 into contact with the first movable main contactor 14.

First, prior to explaining the operation of the preferred embodiment of the present invention, it will be briefly described the operation principle and features of the general air circuit breaker.

The air circuit breaker is a circuit breaker that employs a current-limiting circuit breaker that raises the arc voltage to cut off the current. Compared to the circuit breaker, the circuit breaker has a larger breaking capacity, and an overcurrent trip device is attached and adjustable. Current-limiting means that the flow is controlled small without allowing the short-circuit current to be expected to flow as it is, which makes the energy at the time of breaking small, thereby miniaturizing the circuit breaker.

The air circuit breaker opens and closes the cable line in the air, so it drives the arc by the magnetic field produced by the breaking current and pushes the arc into an arc chute made of arc-resistant insulation material such as zircon powder. Ion extinction is performed to cut off the current. Since the current interruption of the air circuit breaker is different from the current breakdown of the high voltage circuit breaker, the arc voltage value for the circuit voltage is relatively large, and the breaking current follows the current-limiting type of current limiting by the arc voltage. Generally, a current trip device or an overcurrent trip device is built in, and the overcurrent trip device is classified into three types according to the operation time limit. An instant (INST) that detects a short circuit fault and trips the breaker instantly, Is divided into a short time ST for detecting a circuit breaker and a long time LT for detecting a circuit overheat.

Structurally, there are electronic type, thermo type, and semiconductor type static type. In recent years, many types of static type, which are complicated, can be finely calibrated.

The air circuit breaker has the advantages of greater breaking capacity compared to other low voltage breakers, correction of the overcurrent trip device in the field, and simple maintenance and replacement of contacts and arc chutes. It is mainly applied to voltage line of 600V or less of AC, cable line of 3000V or less of DC, and is used as a circuit breaker for low-voltage water distribution facilities of steel, heavy chemical industry, building facilities, power plants and substations, etc. It is stacked and stored in multiple stages in a low-voltage closed switchgear called a power center, and its shape is cubic.

The short circuit and over current protection method of the air circuit breaker includes a full-capacity breaking method that cuts off the short-circuit current flowing through the wire path with a single circuit breaker, and cooperates with a circuit breaker installed on the power supply side of the circuit breaker when the single circuit breaker lacks the breaking capacity. Cascade disconnection method that blocks short-circuit current by backup, and selective disconnection that operates short circuit current only by the circuit breaker on the power supply side closest to the fault point so that the upper circuit breaker does not estimate There is a way.

Hereinafter, the operation of the preferred embodiment of the automatic switching control device of the interlocking air circuit breaker according to the present invention will be described in detail based on the knowledge of the air circuit breaker.

3 is a block diagram showing a first overcurrent relay of the present invention, Figure 4 is a block diagram showing a second overcurrent relay of the present invention.

First, among the two air circuit breakers constituting the interlocking air circuit breaker, in the first air circuit breaker for a normal power supply, the first fixed main contactor 12 and the first movable main contactor 14 receive normal power. It is electrically connected to a power input terminal 11 and a normal power output terminal 13 for outputting the normal power.

When the first air circuit breaker operates normally, the first blocking coil unit 110 may block the first power supply from the first over-current relay 150 as illustrated in FIG. 3. The first power main contactor 14 is separated from the first fixed main contactor 12 by a solenoid type operation according to the input of the normal power input terminal 11 and the normal power output terminal 13. Cut off the electricity from the liver.

On the other hand, if the cause of the overcurrent of the normal power source is removed, the first input coil unit 120 receives the first input signal for energizing the normal power source and the first fixed main contactor 12 by the solenoid type operation. The first movable main contactor 14 is contacted to energize the normal power input terminal 11 and the normal power output terminal 13.

Similarly, in the second air circuit breaker for emergency power supply, which is the other air circuit breaker constituting the interlocking air circuit breaker, the second fixed main contactor 22 and the second movable main contactor 24 receive an emergency power source. It is electrically connected to a power input terminal 21 and an emergency power output terminal 23 for outputting the emergency power.

When the second air circuit breaker operates normally, the second blocking coil unit 210 receives a second blocking signal for shutting off the emergency power from the second overcurrent relay 250 as shown in FIG. 4. The second movable main contactor 24 is separated from the second fixed main contactor 22 by a solenoid type operation so as to cut off energization between the emergency power input terminal 21 and the emergency power output terminal 23. .

On the other hand, if the cause of the overcurrent of the normal power source is eliminated, the second input coil unit 220 receives the second input signal for energizing the emergency power source and the second fixed main contactor 22 by the solenoid type operation. The second movable main contactor 24 is contacted to energize the emergency power input terminal 21 and the emergency power output terminal 23.

Of course, the first blocking signal and the second blocking signal may also be applied through a trip button provided in the front channel of the air circuit breaker. Similarly, the first input signal and the second input signal may also be applied to the front panel of the air circuit breaker. It is also well known to those skilled in the art that it may be applied by a close button provided in the.

Meanwhile, the first limit switch 130 may be connected to the first movable main contactor 14 at a point where the first movable main contactor 14 is separated from the first fixed main contactor 12 and electrically insulated. Upon contact, a first shut-off completion signal is generated, and the second limit switch 230 is at a point where the second movable main contactor 24 is separated from the second fixed main contactor 22 and electrically insulated. The first blocking completion signal is generated by the contact with the second movable main contactor 24.

Accordingly, the mode selector 300 receives the respective detection signals from the normal power supply detecting unit 140 and the emergency power supply detecting unit 240, and when the normal power is applied, the power failure mode occurs. When the emergency power is applied and the normal power is applied, the power transfer control unit 500 may determine whether to transfer the first air circuit breaker and the second air circuit breaker.

When the mode selection unit 300 selects a power failure generation mode, the power switching controller 500 applies the first blocking signal to the first blocking coil unit 110 to provide the first fixed main contactor 12 with the first blocking signal. When the first shut-off completion signal is input from the first limit switch 130 as the first movable main contactor 14 is separated, the second input signal is applied to the second input coil unit 220. The emergency power is controlled to be transferred to the load 400 by contacting the second fixed main contactor 22 and the second movable main contactor 24.

On the other hand, when the mode selector 300 selects the power failure release mode, the power switching controller 500 applies the second blocking signal to the second blocking coil unit 210 to provide the second fixed main contactor 22. When the second blocking completion signal is input from the second limit switch 230 as the second movable main contactor 24 is separated, the first input signal is input to the first input coil unit 120. By applying the first fixed main contactor 12 and the first movable main contactor 14 to control the normal power is transferred to the load 400.

The interlocking air circuit breaker according to the present invention is capable of automatic operation and manual operation, which is shown in Table 1 as follows.

Transfer method division Driving status combination Normal Air Circuit Breakers Emergency lift Automatic operation ON OFF OFF ON Manual operation ON OFF OFF ON OFF OFF

As a result, the present invention can prevent the emergency power circuit breaker and the normal air circuit breaker from being simultaneously supplied with the normal power supply and the emergency power supply to the load depending on whether the normal power failure occurs or the power failure is released without using the emergency power switch. Not only that, but at any moment, only one of the air circuit breakers can be turned on, while the emergency air or normal air breakers can automatically control the turn-on and turn-off actions.

In the above description, the normal power source refers to a power source provided from a main power provider (ie, Korea Electric Power Corporation in the case of Korea), and the emergency power source refers to a power source provided from a large capacity rechargeable battery or a self-generator.

Terminologies used herein are terms defined in consideration of functions in the present invention, which may vary according to the intention or customs of those skilled in the art, and the definitions should be made based on the contents throughout the present application. will be. Although specific embodiments of the invention have been described and illustrated, it will be apparent that the invention may be embodied in various modifications by those skilled in the art.

In addition, since the present invention has been described through the preferred embodiment of the present invention, in view of the technical difficulty aspects of the present invention, those having ordinary skill in the art can easily be different from another embodiment of the present invention. As modifications may be made, it is obvious that both the embodiments and modifications cited in the above description belong to the appended claims.

As described in detail above, in the power failure generation mode in which power failure occurs while the normal power is applied, a first cutoff signal is applied to the cutoff coil part of the first air circuit breaker to operate the first fixed main contactor and the first mover. After disconnecting the main contactor, a second input signal is applied to the input coil of the second air circuit breaker to control the emergency power to be switched to the load by contacting the second fixed main contactor with the second movable main contactor. In the power failure release mode where the emergency power is applied and the normal power is applied, the second blocking signal is applied to the blocking coil of the second air circuit breaker to separate the second fixed main contactor from the second movable main contactor. After the first input signal is applied to the input coil of the first air circuit breaker, the first fixed main contactor and the first According to the present invention which controls the normal power to be transferred to the load by contacting a movable main contactor, the switching time is shortened by automatically performing the switching operation, and immediate action is possible in the absence of an administrator, If the air circuit breaker and the normal air circuit breaker are separated from each other over a relatively long distance, they can be managed economically. There is an advantage to this.

Claims (10)

In interlocked air circuit breakers: A first fixed main contact electrically connected to a normal power input terminal receiving normal power; A first movable main contact electrically connected to a normal power output terminal for outputting the normal power; The first movable main contactor is separated from the first fixed main contactor by a solenoid type operation in response to receiving a first blocking signal for shutting off the normal power supply, and thus, between the normal power input terminal and the normal power output terminal. A first interruption coil unit for interrupting energization; When the first input signal for energizing the normal power is applied, the first fixed main contactor and the first movable main contactor are contacted by a solenoid type operation to energize between the normal power input terminal and the normal power output terminal. A first input coil unit to make; First blocking detecting means for detecting that the first movable main contact is separated from the first fixed main contact and electrically insulated, and generating a first blocking completion signal; A second fixed main contact electrically connected to an emergency power input terminal receiving emergency power; A second movable main contact electrically connected to an emergency power output terminal for outputting the emergency power; In response to receiving the second blocking signal for shutting off the emergency power, the second movable main contactor is separated from the second fixed main contactor by a solenoid type operation, and thus, between the emergency power input terminal and the emergency power output terminal. A second cut-off coil part for cutting off electricity; When the second input signal for energizing the emergency power is applied, the second fixed main contactor and the second movable main contactor are contacted by a solenoid type operation to energize between the emergency power input terminal and the emergency power output terminal. A second input coil part to be made; Second blocking detecting means for detecting that the second movable main contact is separated from the second fixed main contact and electrically insulated, thereby generating a first blocking completion signal; In the power failure generation mode in which power failure occurs while normal power is applied, the first blocking signal is applied to the first blocking coil part to separate the first fixed main contactor from the first movable main contact, and thus the first shutoff. When the first shut-off completion signal is input from the sensing means, the second input signal is applied to the second input coil to contact the second fixed main contactor with the second movable main contactor so that emergency power is transferred to the load. In the power failure release mode in which emergency power is applied and the normal power is applied, the second blocking signal is applied to the second blocking coil part to separate the second fixed main contactor from the second movable main contact. When the second blocking completion signal is input from the second blocking detecting means, the first closing signal is input to the first closing signal. And a power switching control unit configured to apply a portion to control the normal power to be transferred to the load by contacting the first fixed main contactor with the first movable main contactor. . The method of claim 1, wherein the first blocking detection means, And a limit switch for generating a first shut-off completion signal by contact with the first movable main contact at a point where the first movable main contact is separated from the first fixed main contact and electrically insulated. Automatic transfer control device of interlocking air circuit breaker. The method of claim 1, wherein the second blocking detection means, And a limit switch for generating a first shut-off completion signal by contact with the second movable main contact at a point where the second movable main contact is separated from the second fixed main contact and electrically insulated. Automatic transfer control device of interlocking air circuit breaker. The method of claim 1, And a normal power supply sensing unit configured to sense whether the normal power is applied by sensing a secondary voltage of the transformer connected to the normal power supply. The method of claim 4, wherein And an emergency power supply sensing unit configured to sense whether the emergency power is applied by sensing the secondary voltage of the transformer connected to the emergency power source. The method of claim 5, When the normal power is applied and the normal power is applied and the normal power is applied, and a power failure occurs, a power failure generation mode is selected. When the emergency power is applied and the normal power is applied, the normal power is applied. Automatic switching control device of the interlocking air circuit breaker, characterized in that it further comprises a mode selection unit for selecting the power failure release mode. In interlocked air circuit breakers: A first air circuit breaker for interrupting the normal power by extinguishing the arc generated by the interruption of the first fixed main contact electrically connected to the normal power input terminal and the first movable main contact electrically connected to the normal power output terminal; A second air circuit breaker that interrupts the emergency power by extinguishing an arc generated by the interruption of the second fixed main contact electrically connected to the emergency power input terminal and the second movable main contact electrically connected to the emergency power output terminal; And In the power failure generation mode in which power failure occurs while the normal power is applied, a first blocking signal is applied to the blocking coil of the first air circuit breaker to separate the first fixed main contactor from the first movable main contact, and then 2 an input signal is applied to an input coil of the second air circuit breaker to control the emergency power to be switched to the load by contacting the second fixed main contactor with the second movable main contactor, and the emergency power is applied to the In the power failure release mode in which normal power is applied, the second blocking signal is applied to the blocking coil of the second air circuit breaker to separate the second fixed main contactor from the second movable main contactor, and then the first input signal is applied. It is applied to the input coil portion of the first air circuit breaker to contact the first fixed main contactor and the first movable main contactor A load-linked automatic transfer control apparatus of the air circuit breaker comprising: a power transfer control unit for controlling such that the normal power transfer. The method of claim 7, wherein A first limit switch generating a first shut-off completion signal by contact with the first movable main contact at a point where the first movable main contact is separated from the first fixed main contact and electrically insulated; And And a second limit switch for generating a first shut-off completion signal by contact with the second movable main contact at a point where the second movable main contact is separated from the second fixed main contact and electrically insulated. Automatic transfer control device of the interlocking air circuit breaker, characterized in that. The method of claim 8, A normal power supply detecting unit detecting a secondary voltage of a transformer connected to the normal power supply to detect whether the normal power is applied; And And an emergency power supply sensing unit configured to sense whether the emergency power is applied by sensing the secondary voltage of the transformer connected to the emergency power source. The method of claim 9, When the normal power is applied and the normal power is applied and the normal power is applied, and a power failure occurs, a power failure generation mode is selected. When the emergency power is applied and the normal power is applied, the normal power is applied. Automatic switching control device of the interlocking air circuit breaker, characterized in that it further comprises a mode selection unit for selecting the power failure release mode.