KR19990031458U - Trip device of circuit breaker - Google Patents

Abstract

The present invention is to improve the structure of the trip device for operating the switchgear when the accident current is detected so that the operation of the switchgear can be surely performed even if a trip current is detected on any of the R, S, and T phases.

To this end, the present invention has a tripping case (1) having a detector mechanism for detecting overload and short-circuit current, and is installed to be rotatable within a certain angle inside the upper end of the trip case (1) to the overload and A trip bar (2) coupled to the trip case (1) and the shooter rotation support on the outer surface of the trip bar (2) interlocked by the operation of the short-circuit current detector mechanism to overcome the restoring force of the spring and rotate to the power side and integrally connected across each phase. The trip cover 4 having the jaw 3 formed thereon, the shooter rotation supporting jaw 3, which is rotatably installed, the nail striking portion 6 hitting the nail 5 during the trip operation, and the handle for opening and closing when reset. (7) and the handle contact portion (8) in contact with the engaging portion (10) on the upper surface of the shooter control unit 9 of the trip bar (2) at reset, the trip bar (2) when the reset and on the trip bar (2) The catching part 10 is caught in the shooter control part 9 of Both ends are fixed to the shooter 11 which leaves the shooter control unit 9 during the automatic trip, and one end of the shooter 11 and the inside of the upper surface of the trip cover 4 so that the shooter 11 when the trip bar 2 rotates. The elastic member 12 which gives a strong moment of rotation to the shooter 11 by the restoring force as the locking portion 10 of the trip bar 2 is compressed and released until released from the shooter control unit 9 of the trip bar 2. There is provided a tripping device for a circuit breaker.

Description

Trip device of circuit breaker

The present invention relates to a tripping device for a circuit breaker. More specifically, the structure of the tripping device for a circuit breaker allows the tripping operation to be performed accurately and reliably even when an abnormal current is detected on any of the R, S, and T phases.

In general, wiring breakers are mainly installed in switchboards in factories, buildings, etc., and act as a switchgear that supplies or cuts power to the load side under no load condition. If a large current exceeding the load current flows in order to protect the electric wires and load-side equipment of the converter, the circuit breaker to supply or cut off the power supplied from the power supply side to the load side.

On the other hand, wiring breakers are manufactured in a variety of structures due to different sizes, poles, operation methods, etc., but are mainly composed of a mold case, a contactor, a tripping device, an opening / closing mechanism, a protection device, a terminal, and the like.

The conventional circuit breaker configured as described above prevents breakage or fire of the wiring and the connected equipment by quickly disconnecting the circuit when an abnormality occurs in the circuit, and the operating characteristics of the circuit breaker are demonstration trip, pure seat lip, It is divided into three types of one sheet lip.

The operation characteristics of the circuit breaker described above will be briefly described as follows.

First of all, the demonstration trip is more than 125% of the rated current, if the current continues to flow for a certain time, the wire becomes hot and if it is left unattended, it can cause a fire. Say something.

In addition, the forward seat lip refers to interrupting the fault current by tripping the circuit breaker at the moment when a large fault current occurs momentarily due to a load line or a load abnormality.

Also, in case of single-circuit circuit breaker and branch circuit breaker in series, in case of an accident current in one branch circuit near the load side, the circuit breaker of branch circuit should start before the circuit breaker for trunk wiring. The circuit breaker delays the time that the circuit breaker for tripping trips, and this characteristic can be said to be a characteristic only for a circuit breaker capable of adjusting the net trip value.

Such a conventional circuit breaker can rotate the movable contactor manually by the handle operation to open the contact of the movable contactor from the contact of the fixed contactor, and the trip device automatically operates as the accident current is detected to interlock the switching mechanism. The contact between the movable contact and the fixed contact may be opened.

FIG. 1 is a plan view partially cut out of a cover 21 of a conventional circuit breaker, and the conventional circuit breaker detects an abnormal current in each phase to operate the trip bar 2 provided in the opening and closing mechanism.

That is, conventionally, as shown in FIG. 1, the armature 22 which pushes the trip bar 2 as an accident current is detected is provided separately for each phase.

Accordingly, conventionally, the action force of the trip bar 2 for operating the opening and closing mechanism varies depending on which phase an abnormal current is detected.

That is, when the armature 22 installed on the S phase rotates to operate the trip bar 2, since the armature 22 of the S phase pushes the center of the trip bar 2, the force is accurately transmitted to the opening and closing mechanism. However, at the time of tripping due to the rotation of the armature 22 on the R and T phases, due to the distance difference between the center portion of the trip bar 2 and the direction of the action force of the armature 22 on the R and T phases, the armature 22 has an action force. There was a drawback that can not be properly delivered to the trip bar (2).

Therefore, when the armature 22 of the R-T phase is tripped, the pushing force of the armature 22 of the R-T phase is not accurately transmitted to the trip bar 2, so that the reliability of the tripper of the circuit breaker is deteriorated. There was this.

Particularly, since the armature 22 pushes the trip bar 2, the force generated when the upper surface of the armature 22 is sucked toward the detector port (ODP; Oil Dash Pot) for detecting an accident current is all the trip bar ( The force pushing itself 2) was small and it was difficult to improve the operating reliability of the trip bar 2.

The present invention is to solve the above-mentioned problems, and improves the structure of the trip device that operates the switch mechanism when an accident current is detected. It is an object of the present invention to provide a tripping device for a circuit breaker.

1 is a plan view showing the main portion by cutting the cover of a conventional circuit breaker

2 is a perspective view showing a circuit breaker of the present invention

Figure 3 is a plan view showing a circuit breaker of the present invention, a state with the cover removed

4 and 5 are exploded perspective views showing the trip device of FIG.

4 is a bottom perspective view of the trip cover;

5 is a perspective view showing the trip case

6 is a perspective view showing the trip device of FIG.

7 is a longitudinal sectional view showing the main part of a circuit breaker to which the present invention is applied;

* Explanation of symbols for main parts of the drawings

1: trip case 2: trip bar

3: shooter rotation support jaw 4: trip cover

5: nail 6: nail strike part

7: handle for opening and closing 8: handle contact portion

9: Shooter Control Unit 10: Hanging Part

11: shooter 12: elastic member

13: torsion spring 14: fixed protrusion

15: stopper

In order to achieve the above object, the present invention has a tripping case in which a detector mechanism for detecting an overload and a short circuit current is built in each phase, and is installed to be rotatable within a predetermined angle inside the upper end of the trip case, so that the overload and short circuit A trip bar which overcomes the restoring force of the spring by interlocking by the operation of the current detector and rotates to the power side and is integrally connected across each phase, a trip cover coupled to the trip case and having a shooter rotation support jaw formed on an outer surface thereof; It is rotatably installed on the shooter rotation support jaw and has a nail striking portion hitting the nail during a tripping operation, a handle contact portion contacting the opening / closing handle during reset, and a latching portion caught on the upper surface of the shooter control portion of the trip bar during reset. When reset or on, the jammed part is caught in the shooter control part of the trip bar. The shooter which is out of the part, and both ends of the shooter is fixed to the inside of the upper surface of the trip cover and the tripper bar is compressed by the restoring force of the shooter until released from the shooter control part of the trip bar during the rotation of the trip bar by the restoring force Provided is a tripping device for a circuit breaker, characterized in that it has an elastic member to impart a strong rotation moment to it.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 2 to 9.

Figure 2 is a perspective view showing a circuit breaker of the present invention, Figure 3 is a plan view showing the cover removed in the circuit breaker of the present invention, Figure 4 is a bottom perspective view showing a trip cover, Figure 5 is a perspective view showing a trip case 6 is a perspective view illustrating the trip device of FIG. 3.

On the other hand, Figure 7 is a longitudinal cross-sectional view showing the main portion of the circuit breaker to which the present invention is applied, the circuit breaker of the present invention is a trip case (1) in which a detector port for detecting overload and short-circuit current is built in each phase, and the trip case A trip bar installed inside the upper end of the upper part of the upper part of the upper part of the upper part of the upper part of the upper part of the upper part of the upper part of the upper part of the upper part of the upper part to overcome the restoring force of the spring by rotating the overload and short-circuit current detector. ), A trip cover 4 coupled to the trip case 1 and having a shooter rotation support jaw 3 formed on an outer surface thereof, and rotatably installed on the shooter rotation support jaw 3 and during a trip operation. Nail catching portion (6) hitting the nail (5), the handle contact portion (8) in contact with the opening and closing handle (7) at reset, and the engaging portion caught on the upper surface of the shooter control unit (9) of the trip bar (2) during reset ( 10) the trip bar (2) The shooter 11 which is caught by the shooter control part 9 of the trip bar 2 at the time of reset and on, and leaves the shooter control part 9 during manual trip or automatic trip, and one side of the shooter 11. Both ends are fixed to the inside of the top and the top of the trip cover 4 until the locking portion 10 of the shooter 11 is released from the shooter control unit 9 of the trip bar 2 when the trip bar 2 is rotated. It is configured to include an elastic member 12 to impart a strong rotation moment to the shooter 11 by the restoring force as it is released after being compressed.

At this time, a torsion spring 13 is provided on the outer circumferential surface of the trip bar 2 to impart a restoring force to the trip bar 2 so as to have a tendency to rotate toward the load side of the trip bar 2.

In addition, fixing protrusions 14 are formed at one side end of the shooter 11 and the upper end surface of the trip cover 4, respectively, and both ends of the compression springs which are elastic members 12 are respectively formed at the fixing protrusions 14, respectively. It is fixed.

On the other hand, one side of the trip bar (2) is caught by the trip case (1) to prevent the rotation of the trip bar (2) rotated by the restoring force of the torsion spring 13 by a predetermined angle to control the rotation angle of the trip bar (2) A stopper 15 is formed.

The operation of the present invention configured as described above is as follows.

When the circuit breaker is in an on state, the latch 16 is restrained by the latch holder 17, and the latch holder 17 is supported by the support jaw 18 at the upper end of the nail 5, thereby maintaining the main circuit. The latch 16 which tends to rotate by the restoring force of the spring (not shown) maintains the latch holder 17 in a restrained state.

That is, the latch 16 tries to escape the latch holder 17 due to the restoring force of the main spring, but the latch holder 17 cannot be caught by the support jaw 18 of the nail 5 and thus cannot move. Also, since the latch holder 17 cannot be moved out, the contact is kept closed.

On the other hand, when the tripping action of the circuit breaker is made due to the accident current in the on state, the shooter 11 provided in the trip case 1 is rotated by the operation of the trip current detector mechanism, and then the nail 5 is passed through the nail 5. It rotates in the clockwise direction about the hinge axis 19 in the drawing, so that the support jaw 18 of the nail 5 can no longer support the latch holder 17, thereby restoring the main spring The latch 16 is released from the latch holder 17.

The process of releasing the latch 16 from the latch holder 17 in the state where the breaker is turned on will be described in more detail as follows.

When an abnormality occurs due to an overload or a short circuit current, the bimetal or armature 22 acts to overcome the restoring force of the trip bar 2 or the torsion spring 13 and to rotate toward the load side. Since the catching part 10 of the shooter 11 is placed on the shooter control unit 9, the shooter 11 also rotates the shooter rotation support jaw 3 in the counterclockwise direction on the drawing.

In addition, due to the rotational action of the trip bar 2, the compression spring, which is an elastic member 12 provided between the engaging portion 10 of the shooter 11 and the inner surface of the trip case 1, is compressed.

On the other hand, when the rotation of the trip bar 2 is equal to or more than a predetermined angle, the locking portion 10 of the shooter 11 is released from the shooter control unit 9 of the trip ratio 2, whereby the shooter 11 is compressed. The spring is given a large moment of rotation by the restoring force and rotates strongly in the clockwise direction about the axis of rotation.

In addition, as described above, when the shooter 11 is rotated, the nail 5 installed in front of the shooter 11 of the nail striker 6 of the shooter 11 is rotated to rotate the nail 5. As the support jaw 18 of the latch 16 no longer supports the latch holder 17, the latch 16 is released from the latch holder 17 by the restoring force of the main spring as described above.

Further, as the latch 16 is released as described above, the breaker is tripped by linking the link mechanism connected to the latch 16 to rotate the movable contact in a direction away from the fixed contact.

In addition, when the breaker is manually turned off by operating the opening / closing handle 7 in the on state, the lever 20 connected to the opening / closing handle 7 and the main spring and the link mechanism are operated by an interlocking action. The contact of the contact is also separated from the contact of the fixed contact.

On the other hand, when the breaker is turned on while the breaker is tripped, move the opening and closing handle 7 to the reset position on the right side of the drawing to reset the breaker and then insert the opening and closing handle 7 again. Will be moved to the location.

At this time, when the opening and closing handle 7 is moved to the reset position, the tip of the handle 7 pushes the handle contacting portion 8 of the shooter 11 to rotate the shooter 11, and the rotational force of the shooter 11 As a result, the engaging portion 10 of the shooter 11 contacts the lower surface of the shooter control unit 9 of the trip bar 2 to overcome the restoring force of the torsion spring 13 to push up the trip bar 2.

On the other hand, when the pivoting angle of the shooter 11 becomes more than a certain angle by the movement to the reset position of the opening / closing handle 7, the locking portion 10 of the shooter 11 is the shooter of the trip bar 2. The bottom of the control unit 9 goes up, and at the same time, the trip bar 2 is rotated again by the restoring force of the torsion spring 13.

At this time, the trip bar 2 rotated by the restoring force of the torsion spring 13 stops rotation as the stopper 15 formed on one side is caught by the trip case 1, and thus the handle 7 When the applied force is removed, the engaging portion 10 of the shooter 11 is caught by the upper end of the shooter control unit 9 again.

In addition, as described above, the latching portion 10 of the shooter 11 leaves the shooter control portion 9 of the trip bar 2 and the latch 16 is caught by the latch holder 17. As shown, it is in a reset state.

In this way, to turn on the circuit breaker in the reset state, the handle 7 is moved to the closing position on the left side of the drawing, and in the case of manual tripping of the breaker in the reset state, the cover 21 of the mold case You can manually trip by pressing the trip button installed on the panel.

As described above, the present invention is to improve the structure of the trip device for operating the opening and closing mechanism when the accident current is detected.

Accordingly, the present invention can ensure the operation of the opening and closing mechanism even if a trip current is detected in any of the R, S, and T phases.

Claims (4)

A tripping mechanism for detecting overload and short-circuit current is installed in each phase, and the inside of the upper end of the trip case is rotatable within a predetermined angle so as to be interlocked by the operation of the overload and short-circuit current detector. A trip bar which overcomes the restoring force and rotates to the power side and is integrally connected across each phase; A trip cover coupled to the trip case and having a shooter rotation support jaw formed on an outer surface thereof; It is rotatably installed on the shooter rotation support jaw and has a nail striking part that strikes a nail during a trip operation and a handle contact part which contacts a handle for opening and closing when reset, and is caught by the shooter control part of the trip bar when the trip bar is reset and on. The tripping device of a circuit breaker, characterized in that it comprises a shooter which leaves the shooter control unit during manual or automatic trip. The method of claim 1, And a torsion spring for providing a restoring force to the trip bar so that the trip bar tends to rotate to the load side on the outer circumferential surface of the trip bar. The method of claim 1, Fixing protrusions are formed on one side end of the shooter and the inside of the upper end surface of the trip cover, and both ends of the compression spring are fixed to the fixing protrusions, respectively. The method according to claim 1 or 2, On one side of the trip bar, A tripping device for a circuit breaker, characterized in that the stopper for controlling the rotation angle of the trip bar is integrally formed by being caught by the trip case so that the trip bar that is rotated by the restoring force of the spring does not rotate more than a predetermined angle.