KR20180110532A - Electric interlock circuit for circuit breaker - Google Patents

Abstract

Provided by the present invention is an electrical interlock circuit of a circuit breaker, which is able to minimize the generation of the wear and damage of components even after long use without an increase of the outer area of the circuit breaker. According to the present invention, the electrical interlock circuit of a circuit breaker includes: a first closing operation switch which provides a user with an operation means to operate a first circuit breaker to a circuit closing position; a first closing relay which is connected to the first closing operation switch in series; a second closing operation switch which provides a user with an operation means to operate a second circuit breaker to a circuit closing position; a second closing relay which is connected to the second closing operation switch in series; a first closing coil which is connected to a line branched from the serial connection line of the first closing relay and the first closing operation switch, and triggers an opening and closing device of the first circuit breaker to move to a closing position when magnetized by a power supply; a second closing coil which is connected to a line branched from the serial connection line of the second closing relay and the second closing operation switch, and triggers an opening and closing device of the second circuit breaker to move to a closing position when magnetized by a power supply; a pair of second closing relay normal closed contacts which is normally in a closed state, and operates in an open state when the second closing relay is magnetized; and a pair of first closing relay normal closed contacts which is normally in a closed state, and operates in an open state when the first closing relay is magnetized.

Description

[0001] ELECTRIC INTERLOCK CIRCUIT FOR CIRCUIT BREAKER [0002]

The present invention relates to a circuit breaker, and more particularly to an electrical interlock circuit of two circuit breakers.

In a power receiving station using two commercial power sources or operating one commercial power source and one emergency power source (for example, a generator), two power sources are provided in the switchboard, Circuit breakers such as two air circuit breakers (hereinafter abbreviated as air circuit breakers) are installed and operated.

When two circuit breakers are used for opening and closing and protecting the main power source and the standby power source, the two circuit breakers are not operated simultaneously to the ON position, and when one circuit breaker is in the closing position, An interlock device for interlocking the two circuit breakers to prevent the two circuit breakers from being simultaneously put into position is essential.

As an example of the prior art for such an interlock device, the following patent literature can be referred to.

(Patent Document 1) KR20-0183457 Y1

However, the interlock device according to the patent document has a problem that the external surface area of the circuit breaker increases as a mechanical interlock device, the mechanical interlock device fails to interlock due to abrasion, damage, There is a risk that electric power accidents can occur.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an electrical interlock of a circuit breaker which can minimize the occurrence of wear and tear of component parts even when used for a long time without increasing the external surface area of the circuit breaker. Circuit.

It is an object of the present invention to provide an electrical interlock circuit for a circuit breaker that prevents simultaneous operation of two circuit breakers to the closed position,

A first input operation switch, one end of which is connected to the power supply side, for providing an operating means for operating the first circuit breaker to the closed position to the user;

A first closing relay connected in series to the first closing operation switch;

A second input operation switch, one end of which is connected to the power supply side, by providing operation means for operating the second circuit breaker to the closed position to the user;

A second closing relay connected in series to the second closing operation switch;

A trigger is connected to the branch line from the series connection line of the first closing operation switch and the first closing relay and is triggered to operate the opening and closing mechanism of the first circuit breaker to the closing position when magnetized by the power supply, a first input coil for triggering the first coil;

A second input coil connected to the line branched from the series connection line of the second closing operation switch and the second closing relay and triggering the opening and closing mechanism of the second circuit breaker to operate at the closing position when excited by the power supply;

One of which is connected between the first closing relay and the first closing switch and the other of which is connected in series to the first closing coil and which is in the normally closed state and in the open state when the second closing relay is energized, 2 closing relay normally closed contact; And

One of which is connected between the second closing relay and the second closing switch and the other of which is connected in series to the second closing coil and which is in the normally closed state and which operates in the open state when the first closing relay is energized, 1 < / RTI > relay normally closed contact of the circuit breaker according to the present invention.

According to a preferred aspect of the present invention, an electrical interlock circuit of a circuit breaker according to the present invention provides an operating means for operating a first circuit breaker in an open position to a user, Blocking switch; A first trip coil connected in series to the first breaking operation switch for triggering the opening and closing mechanism of the first circuit breaker to operate at the breaking position; A second disconnecting operation switch, one end of which is connected to the power supply side, by providing an operating means for operating the second circuit breaker to the open position to the user; And a second trip coil connected in series to the second shutoff switch for triggering the opening and closing mechanism of the second circuit breaker to operate at the shutoff position.

According to another preferred aspect of the present invention, an electric interlock circuit of a circuit breaker according to the present invention comprises: a first blocking relay connected to a line branched from a series connection line of a first breaking operation switch and a first trip coil; A second blocking relay connected to the line branched from the series connection line of the second trip operation switch and the second trip coil; And a blocking relay normal closing contact installed in a power supply path between the power source and the electric interlock circuit and being in a normally closed state and operating in an open state when the first blocking relay or the second blocking relay is energized do.

According to another preferred aspect of the present invention, an electric interlock circuit of a circuit breaker according to the present invention is installed in a power supply path between a power source and the electric interlock circuit, And an emergency switch for interrupting the power supply to the battery pack.

According to another preferred aspect of the present invention, the electric interlock circuit of the circuit breaker according to the present invention comprises a first counter (COUNTER) connected to the first closing operation switch and counting the number of times of operation of the first closing operation switch, ; And a second counter connected to the second closing operation switch for counting the number of times of operation of the second closing operation switch.

According to another preferred embodiment of the present invention, a timer is connected in parallel to the first blocking relay and outputs a time up signal when a preset time elapses. And a timer contact which is provided in the second closing operation switch, the first closing relay contact and the second closing coil, and operates in a closed position in response to the time-up signal.

According to another preferred embodiment of the present invention, a timer is connected in parallel to the second blocking relay and outputs a time-up signal when a predetermined time elapses. And a timer contact which is provided in the first closing operation switch, the second closing relay contact and the energizing path of the first closing coil, and operates in a closed position in response to the time-up signal.

An electric interlock circuit of a circuit breaker according to the present invention comprises: a first closing relay connected in series to a first closing operation switch of a first circuit breaker; A second closing relay connected in series to a second closing operation switch of the second circuit breaker; A first closing coil connected to the line branched from the series connection line of the first closing operation switch and the first closing relay and triggering the opening and closing mechanism of the first circuit breaker to operate at the closing position when excited by the power supply; A second input coil connected to the line branched from the series connection line of the second closing operation switch and the second closing relay and triggering the opening and closing mechanism of the second circuit breaker to operate at the closing position when excited by the power supply; One of which is connected between the first closing relay and the first closing switch and the other of which is connected in series to the first closing coil and which is in the normally closed state and in the open state when the second closing relay is energized, 2 closing relay normally closed contact; One of which is connected between the second closing relay and the second closing switch and the other of which is connected in series to the second closing coil and which is in the normally closed state and is in the open state when the first closing relay is energized When the first closing relay is in the closing state, the first closing relay normally closed contacts operate even if the second closing operation switch is operated by the user, so that the second closing relay and the second closing relay Since the power supply to the closing coil is interrupted, the closing operation of the second circuit breaker is not performed. Even if the first closing operation switch is operated by the user while the second circuit breaker is in the closing state, The power supply to the first closing relay and the first closing coil is interrupted, so that the closing operation of the first circuit breaker is performed Not simultaneously input to the two circuit-breakers according to the invention has an effect that prevents an electrical interlock (interlocked).

According to a preferred aspect of the present invention, the electric interlock circuit of the circuit breaker according to the present invention is connected in series to the first breaking operation switch of the first circuit breaker, so that the opening and closing mechanism of the first circuit breaker is operated in the blocking position A first trip coil for triggering; And a second trip coil connected in series to the second disconnecting operation switch of the second circuit breaker to trigger the opening and closing mechanism of the second circuit breaker to operate at the shutoff position, The first trip coil is excited to operate the first circuit breaker to the shutoff position, and when the second shutoff operation switch is operated by the user, the second trip coil is excited to operate the second circuit breaker to the shutoff position There is an effect.

According to another preferred aspect of the present invention, an electric interlock circuit of a circuit breaker according to the present invention comprises: a first blocking relay connected to a line branched from a series connection line of a first breaking operation switch and a first trip coil; A second blocking relay connected to the line branched from the series connection line of the second trip operation switch and the second trip coil; And a blocking relay normal closing contact installed in a power supply path between the power source and the electric interlock circuit and being in a normally closed state and operating in an open state when the first blocking relay or the second blocking relay is energized Therefore, when the first cut-off relay is excited by the user's operation of the first cut-off operation switch or the second cut-off relay is excited by the user operation of the second cut-off operation switch, the normally closed contact of the cut-off relay operates in the open state, The power supply to the circuit is interrupted, so that the first and second closing coils and the first and second closing relays can be both reset and reset to the initial state.

The electric interlock circuit of the circuit breaker according to the present invention includes an emergency switch installed in a power supply path between the power supply and the electric interlock circuit and normally shutting off and interrupting power supply to the electric interlock circuit when operated by a user Therefore, the user can press the emergency switch to cut off the power supply to the entire electric interlock circuit, thereby resetting all the coils or relays to the initial state and resetting the power supply to the initial state by pressing the emergency switch again It is possible to obtain an effect that the operation is invalidated even if the input and cutoff operation switches are operated.

Since the electric interlock circuit of the circuit breaker according to the present invention includes the first counter connected to the first closing operation switch and the second counter connected to the second closing operation switch, the number of operations of the first closing operation switch and the second counter It is possible to obtain the effect that the number of times of operation of the closing operation switch is counted by the first counter and the second counter and the count value of the closing operation count of the circuit breaker can be utilized as the maintenance basic information of the circuit breaker.

The electric interlock circuit of the circuit breaker according to the present invention comprises: a timer connected in parallel to the first blocking relay, for generating a time-up signal when a preset time elapses; And a timer contact which is provided in the energization path of the second closing operation switch, the first closing relay contact at the first closing relay, and the closing circuit of the second closing coil, and which operates in the closed position in response to the time-up signal, The second circuit breaker can be turned on only when the time set in the timer has expired (when the timer has expired) after the shutdown operation, thereby providing an effect that the simultaneous inputting of the two circuit breakers can be safely prevented.

The electrical interlock circuit of the circuit breaker according to the present invention comprises: a timer connected in parallel to the second shut-off relay and outputting a time-up signal when a preset time elapses; And a timer contact which is provided in the first closing switch and the closing contact of the second closing relay and the closing coil of the first closing coil and which operates in the closed position in response to the time up signal, The first circuit breaker can be turned on only when the time set in the timer expires (when the timer has elapsed), so that the simultaneous input of the two circuit breakers can be safely prevented.

1 is a circuit diagram showing a configuration of an electric interlock circuit of a circuit breaker according to a first preferred embodiment of the present invention,
2 is a circuit diagram showing a configuration of an electric interlock circuit of a circuit breaker according to a second preferred embodiment of the present invention,
3 is a circuit diagram showing a configuration of an electric interlock circuit of a circuit breaker according to a third preferred embodiment of the present invention,
4 is a circuit diagram showing a configuration of an electrical interlock circuit of a circuit breaker according to a fourth preferred embodiment of the present invention,
5 is a circuit diagram showing a configuration of an electric interlock circuit of a circuit breaker according to a fifth preferred embodiment of the present invention,
FIG. 6 is a diagram showing a switch arrangement of a front operation portion of a controller, showing a switch arrangement of a front operation portion, in a controller of two circuit breakers to which an electric interlock circuit of a circuit breaker according to the present invention is applied.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

The electrical interlock circuit of the circuit breaker according to the present invention is an interlock circuit which prevents the two circuit breakers from simultaneously operating in the closed position and can be embodied in a controller for controlling the opening and closing of the two circuit breakers have.

A configuration of an electric interlock circuit of a circuit breaker according to a first preferred embodiment of the present invention will be described with reference to Fig.

1, an electric interlock circuit of a circuit breaker according to a first preferred embodiment of the present invention includes a first closing operation switch 11, a first closing relay 18, a second closing operation switch 13, The second closing relay 20, the first closing coil 17, the second closing coil 19, the pair of second closing relay normally closed contacts 20b1 and 20b2 and the pair of first closing relay normally closed contacts (18b1, 18b2).

The first input operation switch 11 provides an operating means for operating the first circuit breaker (any one of the two circuit breakers) to the closed position (also referred to as the ON position) to the user, Respectively.

1, the other end of the first closing switch 11 is connected to the power supply line from the power source S, and the other end of the first closing switch 11 is connected to the second And is connected to the closing relay normally closed contact 20b2.

The first input operation switch 11 may have an external front face as shown in FIG. 6 and may be constituted by a push button switch.

The first closing relay 18 is connected to the first closing operation switch 11 in series. The first closing relay 18 shown in FIG. 1 is a coil part that is excited or de-energized according to whether power is applied among the first closing relays.

1, one end of the first closing relay 18 is connected to the first closing operation switch 11 via the second closing relay normally closed contact 20b2, 1 The other end of the closing relay 18 is connected to the ground side line.

The second closing operation switch 13 is provided with an operating means for operating the second circuit breaker (the other one of the two circuit breakers) to the closing position, and one end is connected to the power source S side.

One end of the second closing operation switch 13 is connected to the power supply line from the power source S and the other end of the second closing operation switch 13 is connected to the first closing relay normally closed contact 18b2 do.

The second closing operation switch 13 may have an external contour as shown in Fig. 6 and may be constituted by a push button switch.

The second closing relay 20 is connected to the second closing operation switch 13 in series. The second closing relay 20 shown in FIG. 1 is a portion of the coil which is excited or de-energized depending on whether power is applied to the second closing relay.

1, one end of the second closing relay 20 is connected to the second closing operation switch 13 via the first closing relay contact 18b2, 2 The other end of the closing relay 20 is connected to the ground side line.

The first input coil 17 is connected to a line branched from the series connection line of the first input operation switch 11 and the first input relay 18 and is magnetized by power supply The opening and closing mechanism of the first circuit breaker is triggered to operate at the closing position.

The switching mechanism may include a driving source such as an electric motor or a spring for operating the input and the open position, a power transmission mechanism, and a movable contactor driven by the power transmission mechanism, as is well known. Further, it can be understood that the trigger means an operation such as releasing the restraining state of the spring that charges the elastic energy to perform the closing and opening operation of the opening / closing mechanism.

The second closing coil 19 is connected to the line branched from the series connection line of the second closing operation switch 13 and the second closing relay 20 and when opened by the power supply, To operate in the closing position.

The second closing relay normally closed contact 20b1 of one of the pair of second closing relay normally closed contacts 20b1 and 20b2 is connected to the first closing relay 20 via the first closing relay 20, Switch 11 and the other second closing relay normally closed contact 20b2 is connected in series with the first closing coil 17. [

The pair of second closing relay normally closed contacts 20b1 and 20b2 are in the normally closed state and operate in the open state when the second closing relay is energized.

The first closing relay normally closed contact 18b1 of one of the pair of first closing relay normally closed contacts 18b1 and 18b2 is closed by the second closing relay 20 and the second closing operation The switch 13 and the other is connected in series to the second charging coil 19. [

The pair of first closing relay normally closed contacts 18b1 and 18b2 are normally closed and open when the first closing relay 18 is energized.

In FIG. 1, reference numeral 18a designates a contact point of the first closing relay.

The first closing relay normally open contact (a first closing relay a contact) 18a is connected to the power supply line at one end and the second closing relay 20b2 and the first closing relay 18, respectively.

The first closing relay contact 18a is normally open and the closing relay 18 is closed when the first closing relay 18 is energized.

In FIG. 1, reference numeral 20a designates a contact point of the second closing relay.

The second closing relay normally open contact (a second closing relay a contact) 20a has one end connected to the power supply line and the other end connected to the first closing relay contact 18b2 and the second closing relay 20).

The second closing relay normally open contact 20a is in the normal (normal) open state and the second closing relay 20 is switched to the closed state.

2, the configuration of the electric interlock circuit of the circuit breaker according to the second preferred embodiment of the present invention will be described.

The electric interlock circuit of the circuit breaker according to the second preferred embodiment of the present invention shown in FIG. 2 includes an operation switch for turning off the two circuit breakers, that is, the first circuit breaker and the second circuit breaker, 1 is different from the first embodiment shown in Fig.

Therefore, only the different point will be described in order to avoid the duplication technique.

The electric interlock circuit of the circuit breaker according to the second embodiment includes, in addition to the electric interlock circuit of the circuit breaker according to the first embodiment shown in Fig. 1, a first cut-off operation switch 12, a first trip coil 21, 2 interrupting operation switch 14 and a second trip coil 22. [

 The first cut-off operation switch 12 is provided to the user with an operating means for operating the first circuit breaker in the open position, one end of which is connected to the power supply side.

The other end of the first cut-off operation switch 12 is connected to the power supply line from the power source S as shown in Fig. 2, and the other end of the first cut- And is connected to the trip coil 21.

The first cut-off operation switch 12 may have an external contour as shown in Fig. 6 and may be constituted by a push-button switch.

The first trip coil 21 is connected in series to the first breaking operation switch 12 to trigger the opening and closing mechanism of the first circuit breaker to operate in the blocking position when energized.

The second disconnecting switch 14 provides the user with an operating means for operating the second circuit breaker to the open position, one end of which is connected to the power supply side.

The other end of the second disconnecting operation switch 14 is connected to the power supply line from the power source S and the other end of the second disconnecting operation switch 14 is connected to the second And is connected to the trip coil 22.

The second cut-off operation switch 14 may have an external contour as shown in Fig. 6 and may be constituted by a push-button switch.

The second trip coil 22 is connected in series to the second cut-off operation switch 14 to trigger the open / close mechanism of the second circuit breaker to operate in the cut-off position when excited.

 3, the configuration of the electric interlock circuit of the circuit breaker according to the third preferred embodiment of the present invention will be described.

The electrical interlock circuit of the circuit breaker according to the third preferred embodiment of the present invention shown in FIG. 3 is different from that of the second embodiment shown in FIG. 2 only in that the first interrupting relay, the second interrupting relay, It is different from the example.

Therefore, only the different point will be described in order to avoid the duplication technique.

In addition to the electrical interlock circuit of the circuit breaker according to the second embodiment shown in Fig. 2, the electrical interlock circuit of the circuit breaker according to the third embodiment further includes a first interrupting relay 23 and a second interrupting relay 24, A normally closed contact 16 is additionally provided.

The first blocking relay 23 is connected to the line branched from the series connection line of the first trip operation switch 12 and the first trip coil 21. [

The second cutoff relay 24 is connected to the line branched from the series connection line of the second cutoff switch 14 and the second trip coil 22.

The blocking relay normal closing contact 16 is provided in a power supply path between the power source S and the electric interlock circuit (i.e., the power supply line), and is normally in the closed state, and the first blocking relay 23 or the second blocking relay (24) is energized, it operates in the open state.

The configuration of the electrical interlock circuit of the circuit breaker according to the third embodiment is such that when the user presses (manipulates) the first disconnecting operation switch 12 or the second interrupting operation switch 14, the interrupting relay normal closing contact 16 The first closing coil 17, the second closing coil 19, the first closing relay 18, the second closing relay 20 (20), and the second closing relay 19 are closed by turning off the power supply to the electric interlock circuit according to the present invention. ), The first blocking relay 23 and the second blocking relay 24 can be reset and reset to the initial state.

The configuration of the electric interlock circuit of the circuit breaker according to the fourth preferred embodiment of the present invention will be described with reference to FIG.

The electric interlock circuit of the circuit breaker according to the fourth preferred embodiment of the present invention shown in FIG. 4 is different from the third embodiment shown in FIG. 3 only in that an emergency switch is additionally provided.

Therefore, only the different point will be described in order to avoid the duplication technique.

The electric interlock circuit of the circuit breaker according to the fourth embodiment further includes an emergency switch 15 in addition to the electric interlock circuit of the circuit breaker according to the third embodiment shown in Fig.

The emergency switch 15 is installed in a power supply path (i.e., the power supply line) between the power source S and the electric interlock circuit of the present invention and is normally closed. When the user operates the power switch, Cut off the supply.

The emergency switch 15 may have an external contour as shown in FIG. 6 and may be constituted by a push-button switch.

The configuration of the electric interlock circuit of the circuit breaker according to the fourth embodiment is such that the user depresses the emergency switch 15 to cut off the power supply to the entire electric interlock circuit of the present invention, And the operation is invalidated even if the input and shutoff operation switches are operated unless the user again presses the emergency switch 15 to resume the power supply.

The configuration of the electric interlock circuit of the circuit breaker according to the fifth preferred embodiment of the present invention will be described with reference to FIG.

As shown in the figure, the electrical interlock circuit of the circuit breaker according to the fifth preferred embodiment of the present invention includes the first timer 25, the first timer 25, the second timer 25, and the second timer 25 in the electric interlock circuit of the circuit breaker according to the third or fourth embodiment, Timer contact 25a, a second timer 26 and a second timer contact 26a.

The first timer 25 is connected in parallel to the first blocking relay 23 and outputs a time up signal when a predetermined time has elapsed.

 The first timer contact 25a is provided in the current path of the second closing operation switch 13 and the first closing relay contact 20b2 and the second closing coil 19 or the second closing relay 20, In response to the time-up signal of the first timer (25).

The second timer 26 is connected in parallel to the second blocking relay 24, and outputs a time-up signal when a predetermined time has elapsed.

The second timer contact 26a is provided in the energizing path of the first closing operation switch and the second closing relay contact 18b2 and the first closing coil 17 or the first closing relay 18, In response to the time-up signal of the timer 26, to the closed position.

The electric interlock circuit of the circuit breaker according to the fifth embodiment of the present invention allows the second circuit breaker to be turned on only when the time set in the timer has elapsed (elapsed) after the interrupting operation of the first circuit breaker Or allowing the first circuit breaker to be turned on only when the time set in the timer has expired (after elapse of the predetermined time) after the second circuit breaker's shut down operation, thereby simultaneously preventing the simultaneous input of the two circuit breakers have.

The electric interlock circuit of the circuit breaker according to the present invention includes a first counter COUNTER (not shown) connected to the first closing operation switch for counting the number of times of operation of the first closing operation switch 11, And a second counter (not shown) connected to the second closing operation switch 13 for counting the number of times the second closing operation switch 13 is operated.

The operation of the electric interlock circuit of the circuit breaker according to the preferred embodiment of the present invention will now be described with reference to the drawings.

First, the operation of the electric interlock circuit of the circuit breaker according to the first preferred embodiment of the present invention will be described with reference to FIG.

When the user presses the first closing operation switch 11 to operate the first circuit breaker of the two circuit breakers at the closing position (ON position), the second closing relay 20 is in the device state at this time, The first closing relay 11 is energized through the first closing operation switch 11 and the second closing relay normally closed contact 20b2 in a closed state.

At the same time, the first closing coil 17 is excited through the second closing relay normally closed contact 20b1 whose power source S is in the closed state.

Therefore, the first charging coil 17 triggers the ON / OFF mechanism of the first circuit breaker (not shown) to operate, and the charging spring (not shown) included in the opening / closing mechanism discharges the elastic energy And drives the movable contact, not shown, through a power transmission mechanism (not shown) to a position in contact with the corresponding fixed contact, thereby completing the operation to the closing position where the circuit is closed.

At this time, according to the present invention, since the first closing relay contacts 18b1 and 18b2 are switched to the open position by the magnetic force of the first closing relay 18 excited, even if the second closing operation switch 13 is pressed, The supply of power to the closing coil 19 and the second closing relay 20 is cut off. Therefore, the second closing coil 19 can not be triggered to turn on the ON / OFF mechanism of the second circuit breaker, and the second circuit breaker is prevented from being turned ON.

When the user presses the second closing operation switch 13 in order to operate the second circuit breaker of the two circuit breakers at the closing position (ON position), since the first closing relay 18 is in the element state at this time, The second closing relay 20 is excited through the second closing operation switch 13 and the first closing relay normally closed contact 18b2 in a closed state.

At the same time, the second closing coil 19 is excited through the first closing relay contact 18b1 with the power source S in the closed state.

Accordingly, the second charging coil 19 triggers the ON / OFF mechanism of the second circuit breaker (not shown) to operate, and the charging spring (not shown) included in the opening / closing mechanism charges the elastic energy The movable contact, which is not shown, is driven to a position in contact with the corresponding fixed contact through the illustrated power transmitting mechanism to complete the operation to the closing position where the circuit is closed.

At this time, the second closing relay contact 20b1, 20b2 is switched to the open position by the magnetic force of the second closing relay 20 according to the present invention. Therefore, even if the first closing operation switch 11 is pressed, The supply of power to the closing coil 17 and the first closing relay 18 is cut off. Therefore, the first closing coil 17 can not trigger to turn on the ON / OFF mechanism of the first circuit breaker, so that the first circuit breaker is prevented from being turned ON.

As described above, according to the electric interlock circuit of the circuit breaker according to the first embodiment of the present invention, it is possible to prevent the two circuit breakers from operating at the same time in the closing position (ON position).

The operation of the electric interlock circuit of the circuit breaker according to the second preferred embodiment of the present invention will be described with reference to FIG.

Only the operation of the configuration part different from the first embodiment described above will be described in order to avoid the duplication technique.

In order to operate the first circuit breaker to the shutoff position (OFF position), when the user presses the first shutoff operation switch 12, the power source S is turned on via the first shutoff operation switch 12 to the first trip coil 21 So that the first trip coil 21 is excited.

Then, the first trip coil 21 triggers the opening / closing mechanism of the first circuit breaker to operate at the shutoff position.

A trip spring (not shown) included in the opening / closing mechanism emits the elastic energy, and drives the movable contact, which is not shown, through a power transmission mechanism (not shown) to a position separated from the corresponding fixed contact, The operation to the position is completed.

In order to operate the second circuit breaker to the shutting position (OFF position), when the user presses the second cut-off operation switch 14, the power source S is supplied to the second trip coil 22 And the second trip coil 22 is excited.

Then, the second trip coil 22 triggers the opening / closing mechanism of the second circuit breaker to operate in the shutoff position.

A trip spring (not shown) included in the opening / closing mechanism emits the elastic energy, and drives the movable contact, which is not shown, through a power transmission mechanism (not shown) to a position separated from the corresponding fixed contact, The operation to the position is completed.

The operation of the electric interlock circuit of the circuit breaker according to the third preferred embodiment of the present invention will be described with reference to FIG.

Only the operations of the constituent parts differentiated from the first and second embodiments described above will be described in order to avoid the duplication technique.

In order to operate the first circuit breaker to the shutoff position (OFF position), when the user presses the first cutoff operation switch 12, the power source S is turned on via the first cutoff operation switch 12 to the first cutoff relay 23 So that the first blocking relay 23 is excited.

Then, by the magnetic force of the first blocking relay 23, the blocking relay normal closing contact 16 is switched to the open state.

Therefore, by interrupting the power supply to the electric interlock circuit according to the present invention, the first closing coil 17, the second closing coil 19, the first closing relay 18, the second closing relay 20, It is possible to reset both the blocking relay 23 and the second blocking relay 24 to the initial state.

When the user presses the second cut-off operation switch 14, the power source S is turned on via the second cut-off operation switch 14 to operate the second cut-off relay 24 (OFF position) So that the second blocking relay 24 is excited.

Then, by the magnetic force of the second blocking relay 24, the blocking relay normal closing contact 16 is switched to the open state.

Therefore, by interrupting the power supply to the electric interlock circuit according to the present invention, the first closing coil 17, the second closing coil 19, the first closing relay 18, the second closing relay 20, It is possible to reset both the blocking relay 23 and the second blocking relay 24 to the initial state.

The operation of the electric interlock circuit of the circuit breaker according to the fourth preferred embodiment of the present invention will be described with reference to FIG.

Only the operations of the constituent parts differentiated from those of the first to third embodiments described above will be described in order to avoid the redundant technique.

When the user presses the emergency switch 15, the power supply from the power source S to the entire electric interlock circuit of the present invention is cut off.

Therefore, even if all of the coils and the relays are reset and reset to the initial state and the user does not restart the power supply by pressing the emergency switch 15 again, even if the input and cutoff operation switches 11, 13, 12, Is invalidated.

The operation of the electric interlock circuit of the circuit breaker according to the fifth preferred embodiment of the present invention will be described with reference to FIG.

Only the operations of the constituent parts different from the above-described first to fourth embodiments will be described in order to avoid the duplication technique.

When the user presses the first cut-off operation switch 12, the power source S is connected to the first cut-off relay 23 via the first cut-off operation switch 12 via the power supply line, 25 are operated.

Then, when the predetermined time has elapsed in the first timer 25, the first timer 25 outputs a time-up signal.

Then, the first timer normal open contact 25a operates in the closed position in response to the time-up signal of the first timer 25, and thus the second input connected in series to the first timer normal open contact 25a, The closing operation of the second circuit breaker described above with reference to Fig. 1 can be executed when the operation switch 13 is pressed by the user.

However, since the contact 25a of the first timer is normally open after a predetermined time has elapsed from the first timer 25 after the user presses the first interruption operation switch 12, the power supply is interrupted, The closing operation of the second circuit breaker described above with reference to Fig. 1 is not executed even if the user presses the closing operation switch 13. Fig.

When the user presses the second cutoff operation switch 14, the power source S is supplied to the second timer 14 (FIG. 1) connected in parallel to the second cutoff relay 24 via the second cutoff operation switch 14 via the power supply line 26 are operated.

When the predetermined time has elapsed in the second timer 26, the second timer 26 outputs a time-up signal.

Then, the second timer normal open contact 26a operates in the closed position in response to the time-up signal of the second timer 26, and thus the first input connected in series with the second timer normal open contact 26a The closing operation of the first circuit breaker described above with reference to Fig. 1 can be executed when the operation switch 11 is pressed by the user.

However, after the user presses the second cut-off operation switch 14, the contact point 26a of the second timer is normally open before the predetermined time elapses in the second timer 26, The closing operation of the first circuit breaker described above with reference to Fig. 1 is not performed even if the user presses the closing operation switch 11. Fig.

 Therefore, the electric interlock circuit of the circuit breaker according to the fifth embodiment of the present invention is configured such that only after the time set in the timer of the first circuit breaker has elapsed (elapsed), the second circuit breaker can be turned on The simultaneous closing of the two circuit breakers can be safely prevented by allowing the first circuit breaker to be put into operation only when the time set in the timer has elapsed (after elapse of the time set in the timer).

As described above, the electric interlock circuit of the circuit breaker according to the present invention is characterized in that the relative circuit breaker (the relative circuit breaker of the first circuit breaker is the second circuit breaker, the relative circuit breaker of the second circuit breaker is the first circuit breaker) In the state that the relay normally closed contact is connected in series to the closing operation switch and the first closing relay is normally closed, even if the user operates the second closing switch, the contact of the first closing relay is operated in the open state, Since the power supply to the second input coil is interrupted, the closing operation of the second circuit breaker is not performed. Even if the first closing operation switch is operated by the user while the second circuit breaker is in the ON state, State, the power supply to the first closing relay and the first closing coil is interrupted, Do not support the input operation performed simultaneously input to the two circuit breakers are an effect of preventing the electrical interlock (interlocked).

10: Front operating part
11: first closing operation switch 12: first closing operation switch
13: second closing operation switch 14: second blocking operation switch
15: Emergency switch 16: Shut-off relay Normally closed contact
17: first charging coil 18: first charging relay
18a: First closing relay Normally open contact
18b1: First closing relay Normally closed contact 1
18b2: First closing relay Normally closed contact 2
19: Second charging coil
20: Second closing relay 20a: Second closing relay Normally open contact
20b1: Second closing relay Normal closing contact 1
20b2: Second closing relay Normal closing contact 2
21: first trip coil 22: second trip coil
23: first blocking relay 24: second blocking relay
25: first timer 25a: first timer normal open contact
26: second timer 26a: second timer normal open contact

Claims (6)

An electrical interlock circuit of a circuit breaker which prevents two circuit breakers from operating at the same time in a closed position,
A first input operation switch, one end of which is connected to the power supply side, for providing an operating means for operating the first circuit breaker to the closed position to the user;
A first closing relay connected in series to the first closing operation switch;
A second input operation switch, one end of which is connected to the power supply side, by providing operation means for operating the second circuit breaker to the closed position to the user;
A second closing relay connected in series to the second closing operation switch;
A trigger is connected to the branch line from the series connection line of the first closing operation switch and the first closing relay and is triggered to operate the opening and closing mechanism of the first circuit breaker to the closing position when magnetized by the power supply, a first input coil for triggering the first coil;
A second input coil connected to the line branched from the series connection line of the second closing operation switch and the second closing relay and triggering the opening and closing mechanism of the second circuit breaker to operate at the closing position when excited by the power supply;
One of which is connected between the first closing relay and the first closing switch and the other of which is connected in series to the first closing coil and which is in the normally closed state and in the open state when the second closing relay is energized, 2 closing relay normally closed contact; And
One of which is connected between the second closing relay and the second closing switch and the other of which is connected in series to the second closing coil and which is in the normally closed state and which operates in the open state when the first closing relay is energized, 1 input relay An electrical interlock circuit of a circuit breaker including a normally closed contact. The method according to claim 1,
A first disconnecting operation switch, one end of which is connected to the power supply side, by providing an operating means for operating the first circuit breaker to the open position to the user;
A first trip coil connected in series to the first breaking operation switch for triggering the opening and closing mechanism of the first circuit breaker to operate at the breaking position;
A second disconnecting operation switch, one end of which is connected to the power supply side, by providing an operating means for operating the second circuit breaker to the open position to the user;
And a second trip coil connected in series to the second shutoff switch for triggering the opening / closing mechanism of the second circuit breaker to operate in the shutoff position. 3. The method of claim 2,
A first blocking relay connected to a line branched from a series connection line of the first disconnecting operation switch and the first tripping coil;
A second blocking relay connected to the line branched from the series connection line of the second trip operation switch and the second trip coil; And
And a blocking relay normal closing contact installed in a power supply path between the power source and the electric interlock circuit and being in a normally closed state and operating in an open state when the first blocking relay or the second blocking relay is excited Electrical interlock circuit of circuit breaker. The method according to claim 1,
Further comprising an emergency switch installed in a power supply path between the power source and the electric interlock circuit to shut off the power supply to the electric interlock circuit when the user is normally in a closed state. The method of claim 3,
A first timer connected in parallel to the first blocking relay and generating a time up signal when a preset time elapses; And
And a first timer contact installed in the second closing operation switch and the first closing relay contact and the second closing coil and operating in the closing position in response to the time up signal Characterized by the electrical interlock circuit of the circuit breaker. The method of claim 3,
A second timer connected in parallel to the second blocking relay and for outputting a time-up signal when a predetermined time elapses; And
And a second timer contact installed in the first closing switch and the second closing relay contact and the closing coil of the first closing coil and operating in the closed position in response to the time up signal of the second timer Further comprising the step of providing an electrical interlock circuit for the circuit breaker.

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