KR100262658B1 - Device for applying power to main circuit in vacumm circuit breaker - Google Patents

Abstract

PURPOSE: A conducting apparatus of a main circuit for a vacuum circuit breaker is provided to enhance the stability of the main circuit and the reliability by allowing an electric current to smoothly flow in the main circuit of the vacuum cut-off device. CONSTITUTION: The conducting apparatus includes a mold housing of a main circuit, a vacuum interrupter installed in the mold housing, an upper terminal which is combined to the upper portion of the vacuum interrupter, a movable contact which can be combined with a fixed contact in the vacuum interrupter, a movable terminal(14) which is fixed to the lower portion of the movable contact, a clamp(8), a push rod(11), a lower terminal and shunts. A plurality of guides installed in the shunts, and prevent the shunts from being transformed. One side of the guide is fixed to the clamp(8). The movable contact and the push rod(11) are combined with each other by means of a combining member.

Description

Main circuit unit of vacuum circuit breaker

The present invention relates to a vacuum circuit breaker, and more particularly, to an energizing device of a main circuit portion for a vacuum circuit breaker.

In general, a vacuum circuit breaker is a circuit and device protection device that quickly disconnects a circuit by arcing a vacuum generated in a vacuum container during opening and closing of a normal load and breaking an accident current.

As shown in FIG. 1, the vacuum circuit breaker includes a cradle 1 having a plurality of bushings 17 each having a bushing terminal 18 coupled thereto, and a change lever 19 hinged to the cradle 1. It consists of a trolley part 2, which is pulled in and out while reciprocating, and a main circuit part 3 coupled to the rear side of the trolley part 2, and an auxiliary device. Wrapped by 10).

The main circuit part 3 is provided with an energizing part, an insulating part, and an arc extinguishing device. The energizing part is a peripheral element constituting a contact. The contact is composed of a movable contact and a fixed contact, and the movable contact is a machine of a vacuum circuit breaker. When the vacuum circuit breaker is in the 'closed' state in conjunction with the movable part, the fixed contact point and the movable contact point are in contact, and sufficient pressure is applied to the movable contact point so as not to suppress the current flowing through the circuit by the contact resistance. In this case, the movable contact should be separated at the proper speed to the proper breaking distance.

In addition, the insulating part has an insulating function and is made of an epoxy mold or a BMC resin.

In addition, the extinguishing device extinguishes the arc generated at the time of contact opening and closing of the fault current of the vacuum circuit breaker.

The trolley portion 2 refers to a mechanical mechanism for opening and closing the contact of the vacuum circuit breaker, and corresponds to all the operating devices configured on the front side of the vacuum circuit breaker.

In addition, the auxiliary device is an accessory device for operating the vacuum circuit breaker normally, and corresponds to a control device, an interlock device, a drawing device, and a drawing device.

As described above, the power supplied from the bus line to the main circuit section 3 of the vacuum circuit breaker is energized in the main circuit section 3 by an energizing device of the main circuit section, which is shown in FIG. As described above, the mold housing 4 of the main circuit unit 3, the vacuum interrupter 5 installed in the mold housing 4, and the upper terminal 6 coupled to the upper portion of the vacuum interrupter 5. ), A movable contact 13 installed in the vacuum interrupter 5 so as to be connected to and separated from the fixed contact 12 installed in the vacuum interrupter 5, and a movable terminal 14 coupled to the lower portion of the movable contact 13. ), A bellows 15 installed in the vacuum interrupter 5 to surround the lower side of the movable terminal 14 in a vacuum state, and a lower portion of the movable terminal 14 extending out of the vacuum interrupter 5. Combined clamps (8) and for applying an appropriate pressing force to the contacts A push rod 11 having a threaded portion 20 coupled to the clamp 8 to be connected to the movable terminal 14, and a lower terminal positioned on the push rod 11 and coupled to the mold housing 4. 7), and one end is coupled to the clamp (8) by the fastening force of the bolt, the other end is coupled to the lower terminal (7) by the fastening force of the bolt (Shunt) (9), the upper and lower terminals ( It consists of the clip 16 which is formed in the edge part of 6) 7, and is engaged with the bushing terminal 18 of the bushing 17.

The fixed contact 12 installed in the vacuum interrupter 5 is coupled to the upper terminal 6, and the movable contact 13 installed in the vacuum interrupter 5 includes the movable terminal 14, the clamp 8, and the shunt. It is connected to the lower terminal 7 via (9).

The conventional energizing device of the main circuit unit for the vacuum circuit breaker configured as described above is fastened by fastening the lower terminal 7 with the bolt in the mold housing 4 of the main circuit unit 3, and the upper terminal 6 and the vacuum interrupter 5 and Each component such as the clamp 8 and the shunt 9 having one end coupled to the clamp 8 is inserted into the mold housing 4 in a state in which the components are coupled.

After coupling the inserted parts into the mold housing 4, one end of the push rod 11 inserted through the lower part of the mold housing 4 is fixed to the clamp 8, that is, the movable terminal 14. ) Contact the screw portion 20 formed on the upper portion of the push rod 11 to the clamp 8 coupled thereto, and then, when the push rod 11 is rotated, the screw portion 20 is coupled to the clamp 8. Since the 11 is coupled to the clamp 8, the movable terminal 14 and the push rod 11 are connected, and the other end of the shunt 9 coupled to the clamp 8 is coupled to the lower terminal 7. .

A lower portion of the movable terminal 14 installed in the vacuum interrupter 5 and coupled to the movable contact 13 is wrapped in a vacuum state by the bellows 15, and a change lever hinged in the bogie 2. Since the other end of the 19 and the push rod 11 is coupled, the push rod 11 is reciprocated up and down by the change lever 19 which is rotated to insert and block the trolley portion 2.

Since the movable terminal 14 connected to the push rod 11 reciprocating up and down is also reciprocated up and down, the movable contact 13 is connected to and disconnected from the fixed contact 12 installed in the vacuum interrupter 5. The vacuum circuit breaker is operated and stopped while the lower terminals 6 and 7 are energized and disconnected.

However, in the conventional energizing device of the main circuit unit for the vacuum circuit breaker, the movable terminal and the push rod coming out of the lower portion of the vacuum interrupter installed in the mold housing of the main circuit unit are screwed together in the clamp, so that the vacuum circuit breaker moves up and down when the vacuum circuit breaker is inserted and blocked. There is a problem that the push rod can be released, and the bellows installed in the vacuum interrupter is torn because the movable terminal is rotated when the movable terminal and the push rod are screwed.

In addition, there is also a problem that the shunt is severely deformed under the influence of the electromagnetic field generated when the fault current is interrupted.

The present invention has been made to solve the above problems, the power to flow smoothly through the main circuit portion of the vacuum circuit breaker to improve the stability of the main circuit portion, and to improve the consumer's reliability have.

In order to achieve the above object, the present invention provides a mold housing of a main circuit unit, a vacuum interrupter installed in the mold housing, an upper terminal coupled to an upper portion of the vacuum interrupter, and a fixed contact provided in the vacuum interrupter. A movable contact being coupled to a lower portion of the movable contact, the movable terminal having a lower portion wrapped in a vacuum state by a bellows, a clamp coupled to one end of the movable terminal extending out of the vacuum interrupter, and the movable terminal. A push rod coupled to a lower portion of the main circuit part to be connected to give an appropriate pressing force to a contact point, a lower terminal positioned above the push rod and coupled to a mold housing, and one end coupled to the clamp, and the other end coupled to the lower terminal. Comprising of a shunt; One side is coupled to the clamp, the main circuit unit for the vacuum circuit breaker, comprising a plurality of guides installed inside each shunt to prevent deformation of the shunt, and coupling means for coupling the movable terminal and the push rod. An energization device of is provided.

1 is a side view showing a general vacuum circuit breaker.

Figure 2 is a cross-sectional view showing a power supply of the conventional main circuit portion for a vacuum circuit breaker.

3 is a cross-sectional view showing an energizing device of the main circuit portion of the present invention for a vacuum circuit breaker.

Figure 4 is an exploded perspective view showing a coupling means for coupling the push rod and the movable terminal of the main circuit portion.

Explanation of symbols for main parts of the drawings

101: guide 102: bulb guide

103: supporter 104: hinge

105: engagement hole 106: long hole

107: fastening hole 108: insertion hole

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4.

Since the vacuum circuit breaker has been mentioned in the conventional configuration, overlapping portions will be omitted, and the same reference numerals will be used for the same structure.

Figure 3 is a cross-sectional view showing a power supply of the main circuit portion of the present invention for the vacuum circuit breaker, Figure 4 is an exploded perspective view showing a coupling means for coupling the push rod and the movable terminal of the main circuit portion, the present invention is a mold of the main circuit portion (3) One side is coupled to the clamp 8 provided in the housing 4, and a guide 101 is provided inside the respective shunts 9 so as to prevent deformation of each shunt 9, and in the main circuit part 3. Coupling means is provided to couple the upper portion of the push rod 11 to be coupled with the movable terminal 14 of the vacuum interrupter 5.

The coupling means includes a coupling hole 105 formed at an upper portion of the push rod 11, a bulb guide 102 inserted into an upper portion of the push rod 11, and coupled to a lower terminal 7, and the bulb guide. Inserted into the 102, the supporter 102 is coupled to the lower portion of the movable terminal 14, and is inserted into the coupling hole 105 of the push rod 11 to push the bulb guide 102 and the supporter 103 It consists of the hinge 104 coupled to the rod 11.

A long hole 106 is formed in the bulb guide 102 to smoothly couple the push rod 11 and the supporter 103 to the bulb guide 102, and a fastening hole 107 is formed in the supporter 103. Is inserted, the insertion hole 108 is coupled to the lower portion of the movable terminal 14 in the supporter 103 is formed.

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

First, the lower terminal 7 is fastened by bolts to the mold housing 4 of the main circuit unit 3, and the vacuum interrupter 5 is installed in the mold housing 4, and then the vacuum interrupter 5 is installed. The upper terminal 6 is coupled to the upper portion, and then the clamp 8 is coupled to the lower portion of the movable terminal 14 extending out from the lower portion of the vacuum interrupter 5, and the plurality of shunts 9 are attached to the clamp 8. One end is combined.

At this time, since the guides 101 are respectively provided inside the plurality of shunts 9 having one end coupled to the clamp 8, the influence of the electromagnetic field generated when the shunts 9 interrupt the accident current by the guides 101. Deformation is prevented.

That is, the shunt 9 is brought into contact with the bottom of the clamp 8, and then the guide 101 is brought into contact with the bottom of the shunt 9, and then the shunt 9 and the guide 101 are clamped using a bolt. 8) is coupled to the bottom surface.

As described above, when the coupling of each component is completed, the end of the movable terminal 14 coupled to the clamp 8 is inserted into the insertion hole 108 of the supporter 103 to be coupled and then coupled to the lower terminal 7. The supporter 103 is inserted into the bulb guide 102, and the upper portion of the push rod 11 is inserted through the lower portion of the bulb guide 102.

When the coupling hole 105 formed in the upper portion of the push rod 11 inserted into the bulb guide 102 and the long hole 106 formed in the bulb guide 102 and the fastening hole 107 formed in the supporter 103 coincide with each other. Since the hinge 104 is inserted and fastened, the push rod 11 is connected to the movable terminal 14.

As described above, the coupling of the push rod 11 and the movable terminal 14 is completed, the change hinged in the balance unit 2 in the state that each component is coupled to the mold housing (4) of the main circuit portion (3) Since the other end of the lever 19 and the push rod 11 are coupled, when the change lever 19 is rotated up and down to insert and block the cart 2, the push rod 11 reciprocates up and down while being contacted. And the vacuum circuit breaker is operated and stopped by the mechanical operation of the cart 2.

That is, when the trolley portion 2 of the vacuum circuit breaker is inserted, one end of the change lever 19 is rotated to the lower side of the vacuum breaker, and the other end is rotated to the upper side, so that the push rod 11 coupled to the other end is moved upward. Since the movable terminal 14 coupled to the push rod 11 also moves upward, the movable contact 13 is connected to the fixed contact 12 fixed in the vacuum interrupter 5 so that the upper and lower terminals 6 are connected. An electric current is generated between the seven and the vacuum circuit breaker is operated.

When the cart 2 is blocked, the other end of the change lever 19 is rotated to the lower side of the vacuum breaker so that the push rod 11 is also moved downward along the change lever 19 so that the movable terminal 14 is also moved. The vacuum breaker is stopped because the fixed contact 12 and the movable contact 13 installed in the vacuum interrupter 5 are moved downward and are disconnected between the upper and lower terminals 6 and 7.

At this time, in order to replace components such as the vacuum interrupter 5 and the push rod 11 coupled to the mold housing 4 of the main circuit part 3, the trolley part 2 and the main circuit part 3 are moved to the front side of the vacuum circuit breaker. Since it moves to separate from the cradle (1), after the power is cut off, the main circuit portion (3) is separated from the balance (2).

In the reverse order of combining the components coupled to the mold housing 4 of the separated main circuit portion 3, the parts are separated and then replaced with new ones. 4) to the respective components, and when the coupling is completed, the main circuit portion 3 is coupled to the balance portion 2, and then the balance portion 2 is pushed to the rear side of the vacuum circuit breaker.

When the cart 2 is pushed to the rear side of the vacuum circuit breaker, the clip 16 of the main circuit unit 3 is inserted into the bushings 17 coupled to the cradle 1 so that the bushing terminal of the bushing 17 18, the power sent from the bus is transferred to the main circuit section 3 through the cradle 1, and is applied from the main circuit section 3 to the bogie section 2.

As described above, the present invention is easy to combine the shunt, the upper terminal, the lower terminal and the push rod in the mold housing of the main circuit portion has the effect of improving the assembly.

Further, by installing and coupling the guides inside the shunts, the deformation of the shunts is prevented and the shunts are protected by the guides, so that the dielectric strength of the vacuum circuit breaker can be improved.

In addition, the distance between the fixed contact point and the movable contact point installed in the vacuum interrupter installed in the mold housing can be maintained constantly, and the coupling between the movable terminal and the push rod can be easily performed, thereby improving the reliability of the vacuum breaker.

Claims (3)

A mold housing of a main circuit portion, a vacuum interrupter provided in the mold housing, an upper terminal coupled to an upper portion of the vacuum interrupter, a movable contact connected to and separated from a fixed contact provided in the vacuum interrupter, and a lower portion of the movable contact. A main circuit portion coupled to the movable terminal having a lower portion wrapped in a vacuum state by a bellows, a clamp coupled to one end of the movable terminal coming out of the vacuum interrupter, and connected to the movable terminal to give an appropriate pressing force to a contact; A push rod coupled to a lower portion, a lower terminal positioned above the push rod and coupled to a mold housing, one end coupled to the clamp, and the other end coupled to a lower terminal; A plurality of guides coupled to one side of the clamp and installed inside the shunts to prevent deformation of the shunts; The energizing device of the main circuit unit for a vacuum circuit breaker, characterized in that the coupling means for coupling the movable terminal and the push rod. The method of claim 1, Coupling means and the coupling hole formed in the upper portion of the push rod, A bulb guide having an upper portion of the push rod inserted therein and coupled to a lower terminal; A supporter inserted into the bulb guide and coupled to a lower portion of the movable terminal; The main circuit unit of the main circuit unit for the vacuum circuit breaker, characterized in that consisting of a hinge that is inserted into the coupling hole of the push rod coupled to the push rod and the supporter. The method of claim 2, Forming a long hole in the bulb guide through which the hinge is smoothly inserted and at the same time the push rod and the supporter is coupled to the bulb guide, characterized in that the main circuit unit for the circuit breaker.