KR100732508B1 - Pressure-trip apparatus for molded case circuit breaker - Google Patents

Abstract

The present invention relates to a pressure trip device for a circuit breaker, comprising a case having a gas discharge port formed at a lower portion so that arc gas can be discharged, and a case provided for each phase, and a fixed contactor and a movable contactor installed in the case. A plurality of single-pole blockers each having a contactor portion, an opening / closing mechanism portion connected to the movable contactor to move the movable contactor to an open or closed position, and a arcing portion provided around the fixed contactor so as to extinguish the generated arc. A circuit breaker having a unit, comprising: a trip bar rotatably provided on an upper side of the single pole blocking unit, the trip bar being rotatable in a direction to operate the opening and closing mechanism to move the movable contact to an open trip position; A pressure plate disposed on the downstream side of the gas outlet so as to receive the pressure of the arc gas, and one end connected to the hydraulic plate and the other end extended to the trip bar side to rotate by hitting the trip bar; A gas pressure rotation lever provided with a rotatably installed outside of the case; Characterized in that it comprises a. Accordingly, a pressure tripping device for a circuit breaker which can shorten a trip time during a current-limiting operation, prevents the spread of damage, and improves the reliability of the device.

Description

PRESSURE-TRIP APPARATUS FOR MOLDED CASE CIRCUIT BREAKER}

1 is a view showing the structure of a conventional circuit breaker;

2 is a perspective view of the tripping device region of FIG. 1;

3 and 4 are views for explaining the operation of the trip device of FIG.

5 is a view schematically showing a connection state of a conventional circuit breaker;

6 and 7 are a front view and a perspective view showing a state of use of the pressure trip device of the circuit breaker according to an embodiment of the present invention, respectively;

8 is a perspective view of the trip member of FIG. 7;

9 is a perspective view showing the inside of the single-pole blocking unit of FIG. 6;

10 is a side view for explaining the action of the trip member of FIG.

FIG. 11 is a view illustrating a rotation state of the trip member of FIG. 10.

Explanation of symbols on the main parts of the drawings

10: single pole blocking unit 11: case

13 gas outlet 15 stopper

16: shaft 17: projection

21: contact portion 23: fixed contact

24: fixed contact point 27: movable contactor

28: movable contact 31: opening and closing mechanism

41: trip part 43: magnetic core

44: Amateur 51: Lo

61 gas pressure rotation lever 63 hydraulic plate

65 lever portion 66: fixing protrusion

67: rotating shaft 68: return spring

The present invention relates to a pressure tripping device for a circuit breaker, and more particularly, by using a discharge pressure of arc gas generated during a current-limiting operation to make the trip faster, thereby reducing the trip time and preventing the spread of damage. The present invention relates to a pressure trip device for a circuit breaker which can improve the reliability of the device.

A circuit breaker is a kind of circuit breaker that automatically protects a load and a line by automatically blocking a line when an abnormality such as an overload or a short circuit occurs, such a circuit breaker is normally used in the breaker when an abnormal current It is equipped with a trip function that detects this and automatically cuts off the current.

1 is a view showing the structure of a conventional circuit breaker, FIG. 2 is a perspective view of the tripping device region of FIG. 1, and FIGS. 3 and 4 are views for explaining the operation of the tripping device of FIG. 5 is a diagram schematically showing a multiple connection state of a conventional circuit breaker. As shown in these figures, the circuit breaker includes a plurality of single pole blocking units 10 connected to each of the power supply side and the load side so that the power supply side and the load side can be connected and cut off when an accident current occurs.

Each single pole blocking unit 10 includes a case 11 formed with an insulating member to form an installation space for components therein, and a fixed contactor and a movable contactor (not shown) so that the load side and the power side can be connected and separated. (11) having a terminal portion 21 disposed inside, a lever 33 exposed to the outside of the case 11, the opening and closing mechanism portion 31 for opening and closing to connect and disconnect the power supply side and the load side, and accident current generation The trip part 41 which causes the city opening-closing mechanism part 31 to trip, and the extinguishing part 51 which extinguishes the arc which generate | occur | produces at the time of separation of a load side and a power supply side are comprised.

On the other hand, the trip part 41 is a magnetic core 43 for generating a magnetic force when an accident current is generated, and an armature 44 rotated to the magnetic core 43 side by a magnetic force when magnetic force is generated on one side of the magnetic core 43 and And an interlock mechanism 45 for tripping the opening / closing mechanism 31 in conjunction with the rotation of the armature 44. The interlock mechanism 45 includes a trip bar 47 for pressurizing the opening / closing mechanism 31 to trip, and a trip shooter 48 for rotating the trip bar 47 to a trip position on one side of the trip bar 47. And a shooter spring 49 that applies an elastic force so that the trip shooter 48 can be rotated to the trip position, and a crossbar 50 which suppresses the trip shooter 48 from being rotated to the trip position.

With this configuration, if a magnetic force is generated by the magnetic core 43 when an accident current occurs, the armature 44 is rotated to the magnetic core 43 side by the magnetic force, and the crossbar 50 is rotated by the armature 44. Will be rotated. When the crossbar 50 is rotated, the trip shooter 48, which is inhibited by the crossbar 50, is rotated to the trip position by the elastic force of the shooter spring 49. Accordingly, the trip bar 47 contacts the end portion of the trip shooter 48 that is rotated and is pressed to rotate to the trip position so that the opening / closing mechanism part 31 interlocked with the trip bar 47 trips to block the accident current. .

However, in such a conventional circuit breaker, the magnetic core 43, the armature 44, the crossbar 50, the trip shooter 48, the trip bar 47 and the opening and closing mechanism 31 interlock with each other when an accident current occurs. Since the trip operation is performed, the time interval from the time of occurrence of the fault current to the time of the trip is increased, so that the breaking energy is rapidly increased and the damage of the accident is spread.

In addition, damage and fusion of contacts may occur due to trip delays. In particular, as shown in FIG. 5, when multiple circuit breakers are connected and installed, the lower circuit breaker CB2 may be caused by a delay. If the current cannot be blocked in a timely manner, the upper circuit breaker CB1 is cut off by the fault current, and as a result, the entire lower circuit breaker CB2 is cut off, and the power supply to the peripheral circuit is interrupted, which greatly increases the accident damage. There is a problem.

Accordingly, an object of the present invention is to use a discharge pressure of arc gas generated during current-limiting operation to make a trip faster, thereby shortening the trip time, preventing the spread of damage, and improving the reliability of the device. It is to provide a pressure trip device of the breaker.

In order to achieve the object as described above, the present invention is provided with a gas outlet formed in the lower portion so that the arc gas can be discharged, the case is provided for each phase, the contact having a fixed contactor and a movable contactor installed in the case A plurality of single-pole breaking units each having a magnetic part, an opening / closing mechanism part connected to the movable contactor to move the movable contactor to an open or closed position, and a arcing part provided around the fixed contactor to extinguish the generated arc; A circuit breaker having a circuit, comprising: a trip bar rotatably installed on an upper side of the single pole blocking unit, the trip bar being rotatable in a direction to operate the opening / closing mechanism to move the movable contact to an open trip position; A pressure plate disposed on the downstream side of the gas outlet so as to receive the pressure of the arc gas, and one end connected to the hydraulic plate and the other end extended to the trip bar side to rotate by hitting the trip bar; A gas pressure rotation lever provided with a rotatably installed outside of the case; It provides a pressure trip device for a circuit breaker comprising a.

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Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

6 and 7 are a front view and a perspective view showing a state of use of the pressure trip device of the circuit breaker according to an embodiment of the present invention, Figure 8 is a perspective view of the trip member of Figure 7, Figure 9 is Figure 6 10 is a perspective view illustrating the inside of the single-pole blocking unit of FIG. 10, and FIG. 10 is a side view illustrating the operation of the trip member of FIG. 9, and FIG. 11 is a view illustrating a rotation state of the trip member of FIG. 10. The same and equivalent parts as those described above and shown in the drawings will be omitted for convenience of description of the drawings and will be described with reference to the same reference numerals. As described above, the circuit breaker is connected to each of the three phase AC lines of the load side and the power side or each phase line of the four phase AC line so that the circuit between the load side and the power side can be manually opened and closed and a fault current such as a short circuit current or a ground fault current It is provided with a plurality of single-pole blocking unit 10 to automatically detect a large current flow on the circuit when the occurrence occurs, so that the circuit is blocked, that is, tripping to cut off the accident current.

Each single pole blocking unit 10 is provided with a gas outlet 13 formed in the lower portion so that the arc gas generated during the current flow action can be discharged and is provided for each phase to seal and accommodate the internal parts for electrical insulation between phases A case 11, a pair of current-limiting fixed contactors 23 installed in the case 11 and connected to the load-side and power-side terminal portions, respectively, and the closing position and the fixed contactor 23 contacting the fixed contactors 23; A contact part 21 having a movable contactor 27 which is movable to an open position separated from the fixed contactor and moves by itself to a position separated from the fixed contactor 23 by an electromagnetic repulsive force with the fixed contactor 23 when an accident current occurs. ), The opening / closing mechanism part 31 which is connected to the movable contactor 27 to move the movable contactor 27 to the open or closed position, and the current-limiting operation of the contactor part 21 according to the occurrence of the accident current. So that the arc can be Lo and a Lo (51) provided in the periphery of the fixed contact 23 in the case 11, respectively.

As shown in FIG. 9, the current-limiting fixed contactor 23 has a terminal portion connected to a power supply line or a load-side line and a contact portion to which a contact point 24 contacting or separating from a contact point 28 of the movable contactor 27 is attached. The direction of the current bent into a U-shape and flowing into the contact point 24 and the direction of the current flowing out into the contact point 28 of the movable contactor 27 through the contact part are in the opposite direction to each other. When a large current due to an accidental current flows in the current-limiting fixed contactor 23 on the circuit, a large magnetic force is generated by the large currents flowing in opposite directions at the contact portion as described above, and the magnetic forces repel each other. Electromagnetic repulsive force is generated so that the movable contactor 27 detaches itself from the fixed contactor 23, which is called a current-limiting operation. However, at this time, when the large current is extinguished or weakened, the movable contactor 27 is brought back into contact with the fixed contactor 23 by a contact spring not shown. Therefore, unless the electromagnetic repulsive force is maintained larger than the return force of the contact spring, the movable contact 27 does not maintain the position separated from the fixed contact 23 by the current-limiting operation alone, so that the movable contact 27 is a fixed contact ( It is necessary to move the movable contactor 27 to the trip position which keeps the position separated from 23, and the opening / closing mechanism 31 is in charge of such a function.

As is well known, the opening / closing mechanism 31 is manually turned on by the user, and the ON contact position of the movable contactor 27 in contact with the fixed contactor 23 and the movable contactor 27 from the fixed contactor23. A handle for operating to a separate OFF position, and one end is connected to the handle and the other end is connected to a support shaft for rotatably supporting the movable contactor 27 to accumulate elastic energy in the ON position and to operate the movable contact during trip operation. A trip spring for preserving elastic energy accumulated to be separated from the fixed contactor 23, a latch mechanism for maintaining the trip spring of the trip spring at an ON position, and one end thereof connected to the handle And the other end is connected to the support shaft is composed of a link or the like for transmitting the driving force of the handle to the support shaft, the detailed configuration and operation description will be omitted. Pressure trip device according to the present invention by operating the opening and closing mechanism 31 by using the pressure of the arc gas generated during the current-flow operation to the trip position to maintain the position of the movable contactor 27 separated from the fixed contactor 23 It can be said to be a driving device of the opening and closing mechanism 31 to operate.

The case 11 of the single-pole breaking unit provided for each phase of the AC line is made of an electrical insulating material as described above, and is sealed to be electrically insulated from the contact portion and the extinguishing portion of the other phase. It is built.

On the other hand, the upper and lower portions of the case 11 of each single-pole blocking unit communicate with the respective arc extinguishing portions 51, and the heated ambient air and the contact portion are burned by the arc generated between the contacts during the current-limit operation and the arc of high heat. A gas discharge port is provided to allow the generated arc gas to be discharged to the outside, and in the present invention, the pressure of the arc gas discharged from the lower gas discharge port 13 is used.

The pressure trip device of the circuit breaker of the present invention is rotatably installed on the upper side of the single-pole breaking unit as described above, and is rotatable in the direction of operating the opening and closing mechanism 31 to move the movable contactor 27 to the open trip position. A gas pressure rotation lever 61 which is rotatably installed on the trip bar 47 and the side wall of the single-pole blocking unit and rotates by the gas pressure from the gas outlet 13 to rotate the trip bar 47, and this gas pressure rotation And a return spring 68 for providing an elastic force to the gas pressure rotation lever 61 in the direction of returning the lever 61 to its original position.

Here, each gas pressure rotation lever 61 includes a rotatable lever portion 65 capable of rotating the trip bar 47 by the upper end portion facing the trip bar 47, and a lower end portion of the lever portion 65. It is configured to include a hydraulic plate (63) for connecting the gas discharge port so as to face the gas discharge port and providing the rotational power of the lever unit (65) under the pressure of the arc gas. Preferably, the hydraulic plate 63 is made of a resin material integrally with the lever portion 65, alternatively, it is possible to be connected by a separate connection member. The gas pressure rotation lever 61 is rotatably supported by a rotation shaft 67 which is supported at both ends on the wall surface of the case 11 between a pair of adjacent single pole blocking units.

Since the lever part 65 is arrange | positioned between a pair of adjoining single-pole blocking units, the separate circuit space for the lever part 65 is unnecessary, and the wiring breaker is miniaturized.

The hydraulic plate 63 of the gas pressure rotation lever 61 is adjacent to provide the rotational power by receiving the pressure of the arc gas from at least one gas outlet of the gas outlets 13 and 13 of the pair of adjacent single pole blocking units. The gas outlets 13 and 13 of the pair of single pole blocking units are partially opposed to each other.

The upper end portion of the lever portion 65 facing the trip bar 47 is bent toward the trip bar 47 so as to shorten the moving distance to the trip bar 47.

The return spring 68 is embodied in the form of a torsion coil spring, one end of which is supported by a fixing protrusion 66 formed on one side on the rotational shaft 67 and the adjacent lever part 65, and the other end of the case 11. Is fixed in contact with the protruding portion 17 formed on the back side. Here, the return spring 68 may be configured in the form of a compression coil spring.

On the other hand, the case 11 is formed with a shaft hole 16 for supporting each pivot shaft 67 to be rotated, the case 11, the side hole of the shaft hole 16 and the adjacent case 11 when the current flow A stopper which is installed at a predetermined position within the rotation range of the lever portion 65 of the gas pressure rotation lever 61 rotated by the discharged gas pressure so as to limit the rotation range of the gas pressure rotation lever 61 ( 15) is formed.

Referring to the operation of the pressure trip device of the circuit breaker of the present invention configured as described above are as follows.

 When an accident current is generated, an electromagnetic repulsive force is applied between the fixed contact 24 and the movable contact 28 so that the movable contact 27 is rotated so that the movable contact 28 is separated from the fixed contact 24. At this time, the high temperature gas is generated together with the arc between the movable contact 28 and the fixed contact 24, and when the generated high temperature and high pressure arc gas is discharged to the outside through the gas outlet 13, the gas outlet 13 is located in front of the gas outlet 13. The pressure of the arc gas acts on the hydraulic plate 63 which is opposed to each other.

Therefore, by the rotational power transmission of the hydraulic plate 63 of the gas pressure rotation lever 61, the lever portion 65 of the gas pressure rotation lever 61 is rotated about the rotation shaft 67, and at this time, the lever portion 65 The upper end of the) is rotated by pressing the trip bar 47, the opening and closing mechanism 31 is operated to the trip position by the rotating trip bar 47. That is, while the latch mechanism is not shown, the support shaft is rotated by the prevailing elastic energy of the trip spring to rotate the movable contactor 27 clockwise in FIG. 9 to be separated from the fixed contactor 23, thereby preventing the accident current. The movable contactor 27 is separated from the fixed contactor 23 to maintain the tripping position where the circuit between the power supply and the load is interrupted until the cause of occurrence is removed and the user operates the handle to reset it back to the ON position.

At this time, the rotation of the lever portion 65 of the gas pressure rotation lever 61 is stopped at a predetermined position by the stopper 15, and the lever portion 65 of the gas pressure rotation lever 61 is connected to the return spring 68. The upper end is spaced apart from the trip bar 47 by the elastic force to return to the opposite initial position.

In the above-described and illustrated embodiments, a configuration in which one gas pressure rotation lever is arranged between a pair of adjacent single pole blocking units is described. However, a modified embodiment in which one gas pressure rotation lever is provided for each single pole blocking unit is also possible. Do.

As described above, according to the present invention, the trip is made faster by using the discharge pressure of the arc gas generated during the current-limiting operation, which shortens the trip time, thereby preventing the spread of damage caused by the accident current and the reliability of the device. Provided is a pressure trip device for a circuit breaker capable of improving the accuracy of the wiring breaker.

Claims (7)

A contactor having a gas discharge port formed at a lower portion to discharge arc gas, and provided for each phase, a contact portion including a fixed contactor and a movable contactor installed in the case, and the movable contactor connected to the movable contactor. A circuit breaker having a plurality of single pole blocking units each having an opening / closing mechanism for moving the light to a open or closed position, and a extinguishing portion provided around the fixed contact so as to extinguish the generated arc. A trip bar rotatably installed on an upper side of the single pole blocking unit, the trip bar being rotatable in a direction to operate the opening and closing mechanism to move the movable contact to an open trip position; A pressure plate disposed on the downstream side of the gas outlet so as to receive the pressure of the arc gas, and one end connected to the hydraulic plate and the other end extended to the trip bar side to rotate by hitting the trip bar; Comprising a gas pressure rotation lever which is provided to be rotatably installed on the outside of the case; The hydraulic plate is partially provided at the gas outlets of the adjacent pair of single pole blocking units so as to provide rotational power under the pressure of the arc gas from at least one of the gas outlets of the adjacent pair of single pole blocking units. The pressure trip device of the circuit breaker characterized by being installed over. delete delete delete delete The method of claim 1, One side is supported on the side wall of the single-pole blocking unit and the other side is installed to be supported by the gas pressure rotation lever, further comprising a return spring for applying an elastic force in the direction to return the gas pressure rotation lever to the initial position Pressure trip device. The method of claim 6, The return spring is a pressure trip device of a circuit breaker, characterized in that the torsion spring.

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