KR102457966B1 - Driving apparatus for load breaker switch - Google Patents

Abstract

The present invention relates to a driving device for driving a load switch with a fuse that separates the line side and the load side from the power system in which the accident occurs and prevents the spread of the accident from spreading. It relates to a drive device for a load switch with a fuse that amplifies the force so that the vacuum interrupter is opened immediately and stably.
A driving device for a load switch with a fuse according to the present invention includes: a vacuum interrupter for opening and closing a line side and a load side; current-limiting fuse connected to the load side; a driving means for driving the vacuum interrupter to open when the current-limiting fuse is melted; and an amplifying unit that amplifies the striker's force that operates when the current-limiting fuse is melted and transmits it to the driving means.

Description

Driving apparatus for load breaker switch with fuse

The present invention relates to a driving device for driving a load switch with a fuse that separates the line side and the load side from the power system in which the accident occurs and prevents the spread of the accident from spreading. It relates to a drive device for a load switch with a fuse that amplifies the force so that the vacuum interrupter is opened immediately and stably.

The present invention relates to a driving device for a load switch with a fuse used as a main breaking device at the end of a special high-voltage line or a special high-voltage power receiver.

As a main breaking device, a CB (breaker) for customers over 1,000KVA, a fuse that operates mechanically without a combination of a disconnected ejection fuse cutout switch and an automatic switchgear (ASS) or an electronic relay for customers less than 1,000KVA An attached load switchgear is used.

A circuit breaker is used for large-capacity consumers, and the shortest fault removal time is 3 cycles. The fault section automatic switchgear is a load switch that uses an electromagnetic relay, and the cutout switch blocks a large current fault, and the fault section automatic switch cuts off a fault in the overcurrent area (900A or less). If the phase loss protection fails and the electronic relay fails to operate due to problems with the battery and control circuit, etc., the operation time of the emission type fuse is about 1 cycle.

In the load switchgear with fuse of the present invention, the current-limiting fuse cuts the fault current at high speed (5ms), thereby eliminating the failure of the line recloser operation line. There is no problem of malfunction or non-operation even after time passes by operating the load switch with the striker force of the fuse without an electronic control device.

The load switch with a fuse includes a vacuum interrupter for opening and closing a line side and a load side, a current-limiting fuse connected to the load side, and a driving device for driving the vacuum interrupter to open when the current-limiting fuse is blown.

The current limiting fuse and vacuum interrupter of the load switch are installed in an insulator made of epoxy resin. The device opens the three-phase power vacuum interrupter at the same time.

The release force of the Korean current fuse striker is about 8kg/cm^2, which is not very large, and part of the release force is lost while being transmitted to the drive device through the transmission medium, so the striker force transmitted to the drive device is about 3kg/cm^2. , it is insufficient to quickly and stably drive the driving device.

A load switch equipped with a current-limiting fuse has a fault removal time of 0.3CYCLE, and in most fault currents, faults can be removed before the response time of the back-up protection device, thereby preventing wide-area power outages in case of faults of individual customers. In addition, the load switch equipped with the current-limiting fuse does not have an electronic circuit, and the striker operates the driving device when the current-limiting fuse is blown, so there is no problem of malfunction due to aging. Maintenance is essential when batteries or electronic circuits are used, but considering that there is no professional manpower capable of maintenance such as automatic switchgear for faulty sections in general consumers, mechanically operated load switchgear is the most suitable for protecting the power receiving equipment of consumers. and it is the optimal means to prevent consumer accidents from causing wide-area power outages.

For reference, the prior art of the load switchgear has been disclosed in various ways, such as registered patent 10-1271594 "load switchgear" and registered patent 10-1702586 "power fuse module and high-pressure gas load switchgear having the same".

The present invention is an invention devised to solve the problem of the load switch according to the prior art, and by amplifying the striker force emitted when the current-limiting fuse is melted and transmitting it to the drive means, the drive device for the load switch is rapidly and stably three-phase An object of the present invention is to provide a driving device for a load switch with a fuse that can open a vacuum interrupter.

A drive device for a load switch with a fuse according to the present invention

A driving device for driving a load switch with a fuse comprising a vacuum interrupter for opening and closing a line side and a load side, and a current-limiting fuse connected to the load side,

a driving means for driving the vacuum interrupter to open when the current-limiting fuse is melted;

and an amplifying unit that amplifies the striker's force that operates when the current-limiting fuse is melted and transmits it to the driving means.

and the driving means

an operation arm connected to the vacuum interrupter;

a main lever that pushes or pulls the operation arm forward and backward to open and close the vacuum interrupter;

and a power assembly for opening the vacuum interrupter by advancing the main lever locked in a reverse state when the current-limiting fuse is cut by elastic force,

The amplification unit is

rotary latch,

a trigger latch engaged with the rotary latch and released from engagement by the force of the current-limiting fuse striker;

an amplifying spring for rotating the rotary latch with elastic force;

and an open lever for releasing the lock of the power assembly by the rotational force of the rotary latch,

a return bar protruding from the rotary latch;

and a return wall provided on the main lever and configured to push the return bar of the rotary latch forwardly rotated to open it when the main lever is advanced to rotate the rotary latch in a reverse direction to return the rotary latch to its original position,

a flexible plastic rod that transmits the force of the Hallyu fuse striker to the amplification unit;

It characterized in that it further comprises an insulating tube for accommodating the flexible plastic rod to guide the movement of the flexible plastic rod.

In the driving device for a load switch with a fuse according to the present invention, the driving device quickly and stably opens the vacuum interrupter by amplifying the force emitted by the striker of the current-limiting fuse by the amplifying unit and transmitting it to the driving means, and the operated amplifying unit is driven It automatically returns to its original state with the force when the means is opened, and the insulating tube and flexible plastic rod function to transmit the force of the current-limited fuse striker to the amplification unit while maintaining electrical insulation while minimizing the loss of force. This enables the smooth operation of the load switch with fuse.

1 is a front view and a side view showing the exterior of a driving device for a load switch with a fuse according to an example of the present invention;
2 is a view showing the internal structure of a driving device for a load switch with a fuse according to the present invention.
3 is a view showing an operation mechanism for explaining the operation of the driving means and the amplification unit according to the present invention.

Hereinafter, a driving device for a load switch with a fuse according to the present invention will be described in more detail with reference to the drawings.

Prior to describing the driving device for a load switch with a fuse according to the present invention in more detail,

Since the present invention can have various changes and can have various forms, implementation examples (態樣, aspects) (or embodiments) will be described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

In each drawing, the same reference sign, particularly the number of the tens and one digit, or the reference numerals having the same tens, one, and alphabet, indicates a member having the same or similar function, and unless otherwise specified, each of the figures in the drawings The member indicated by the reference sign may be understood as a member conforming to these standards.

In addition, in each drawing, in consideration of the convenience of understanding, the size or thickness is exaggeratedly large (or thick) small (or thin) or simplified, but the protection scope of the present invention is limited by this. it shouldn't be

The terminology used herein is only used to describe a specific embodiment (aspect, aspect, aspect) (or embodiment), and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as comprises or consists of are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It is to be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Referring to FIG. 1 , the load switchgear includes three bodies 10 consisting of a vertical portion 11 in a vertical direction and a horizontal portion 13 connected in the horizontal direction from the vertical portion 11 , and It includes an enclosure 20 provided at the lower portion. Each of the three bodies 10 is responsible for one of the three phases of electric power to open and close.

Hereinafter, the configuration of the load switchgear will be schematically described with reference to FIG. 2 .

A power supply-side external connection terminal 15 to which a line-side cable is connected is provided at an end of the vertical portion 11 of the body 10, and a load-side external connection terminal 17 to which a load-side cable is connected to an end of the horizontal portion 13 ) is provided, and the external connection terminal and the internal connection terminal are covered and protected with an insulating cover 19 for waterproofing and dustproofing.

Inside the vertical part 11 of the body 10, a vacuum interrupter 30 that electrically opens and closes the line side and the load side is built-in, and the horizontal part 13 of the body 10 part is melted in the event of an accident in the power system A current-limiting fuse 40 is built-in.

Inside the enclosure 20, a driving means 50 for opening the vacuum interrupter 30 when the current-limiting fuse 40 is melted, and the driving means 50 by amplifying the force of the current-limiting fuse 40 striker The amplification unit 60 to deliver is built-in.

An insulating rod 31 connected to the vacuum interrupter 30 is built in the vertical portion 11 of the body 10, and an end of the insulating rod 31 is connected to a driving shaft 33, and the driving shaft (33) is connected to the drive means (50) of the enclosure (20). The driving shaft 33 and the insulating rod 31 are raised and lowered by the driving of the driving means 50 . When ascending and descending, the vacuum interrupter 30 is input (closed) to electrically connect the line side and the load side, and when descending, the vacuum interrupter 30 is opened to electrically separate the line side and the load side.

A transmission medium is embedded in the vertical portion 11 and the horizontal portion 13 of the body 10 to transmit the emission force of the current-limiting fuse 40 and the striker 41 to the amplifying unit 60 . Since the horizontal part 13 of the main body in which the current-limiting fuse 40 is embedded and the enclosure 20 in which the amplification unit 60 is built are not arranged in a straight line, the transmission medium is amplified with the striker 41 of the current-limiting fuse 40. The units 60 are connected by a curve. The present invention connects the striker 41 of the current-limiting fuse 40 and the amplification unit 60 as a transmission medium so that the curved transmission medium can transmit the release force of the current-limiting fuse 40 and the striker 41 without loss. It consists of a flexible plastic rod 43, which accommodates the flexible plastic rod 43, and an insulating tube 45 that guides the movement of the plastic, and the flexible plastic rod 43 inside the insulating tube 45 has no friction loss. Insulation oil to allow movement may be filled. When the insulating tube 45 is fixed inside the body 10, the flexible plastic rod 43 moves without resistance even in the curved part, and the movement according to the release of the striker 41 (that is, the force according to the release) is By moving in conjunction, the force of the striker 41 is immediately transmitted to the amplification unit 60 .

Hereinafter, the configuration and operation mechanism of the driving means 50 and the amplifying unit 60 will be described with reference to FIG. 3 .

The driving means 50 includes a base 51 , an operation arm 52 , a main lever 53 , and a power assembly.

The manipulation arm 52 is formed in a 'L' shape and is rotatably coupled to the base 51 . One end of the manipulation arm 52 is connected to the drive shaft 33 connected to the vacuum interrupter 30 , and the other end is connected to the main lever 53 . When the main lever 53 moves forward or backward, the other end of the operating arm 52 is pushed or pulled, and the drive shaft 33 connected to one end of the operating arm 52 is raised or lowered to insert (close) the vacuum interrupter 30 . ) or open it.

The main lever 53 is coupled to the base 51 to move forward and backward. When the main lever 53 advances (moves to the left in the drawing), it pushes the other end of the manipulation arm 52 to lower the drive shaft 33 connected to one end, and when it moves backward (moves to the right in the drawing), the manipulation arm ( 52) to elevate the drive shaft 33 connected to one end by pulling the other end.

The power assembly locks the reverse state of the main lever 53 to prevent the main lever 53 from moving forward, and also condenses the force for the main lever 53 to advance in the reverse state of the main lever 53 . When the current-limiting fuse 40 is melted, the lock is released to advance the main lever 53 with the condensed force.

The power assembly has both ends connected to the main lever 53 and the base 51, respectively, so as to provide an elastic force for the main lever 53 to advance, and an opening spring 54 to move the main lever 53 backward. A hook 55 that locks in the state, a release latch 56 that releases the lock state of the hook 55, and a 'T'-shaped connecting member connecting the hook 55 and the main lever 53 ( 57) and the like.

The amplification unit 60 includes a rotary latch 61 , a trigger latch 62 , an amplification spring 63 , and an open lever 64 .

The rotary latch 61 is rotatably coupled to the base 51, and a locking protrusion 61a and a push part 61b are protruded from the edge thereof.

The trigger latch 62 is formed in a 'L' shape and is rotatably coupled to the base 51 . At one end of the trigger latch 62, a hook 62a caught on the locking jaw 61a of the rotary latch 61 is formed, and at the other end, a flexible flexible for transmitting the release force of the current-limiting fuse 40 and the striker 41. The plastic rod 43 is connected.

Both ends of the amplifying spring 63 are connected to the base 51 other than the rotary latch 61, respectively, so that the rotary latch 61 rotates in the forward direction by elastic force. The force of the amplification spring 63 to rotate the rotary latch 61 is about 20 kg/cm^2, which is stronger than the release force (about 3 kg/cm^2) of the current-limiting fuse 40 and the striker 41 .

The open lever 64 includes a vertical bar 64a rotatably coupled to the base 51 and a horizontal bar 64b having both ends connected to the vertical bar 64a and the release latch 56, respectively. and an end of the vertical bar 64a is disposed adjacent to the push part 61b of the open latch.

Referring to [A], [B] and [C] of FIG. 3 , the operation mechanisms of the amplifying unit 60 and the driving means 50 to which the vacuum interrupter 30 is opened are as follows.

When the current-limiting fuse 40 is fused, the striker 41 is released from the current-limiting fuse 40, and the flexible plastic rod 43 moves in conjunction with the release of the striker 41 to push the other end of the trigger latch 62. give (①),

One end of the trigger latch 62 is bent, and the engagement between the hook 62a of the trigger latch 62 and the locking jaw 61a of the rotary latch 61 is released (②),

The amplification spring 63 pulls the rotary latch 61 and rotates it in the forward direction (③),

The push part 61b of the rotary latch 61 pushes the vertical bar 64a of the open lever 64 (④), and the horizontal bar pulls the release latch 56 (⑤),

The release latch 56 releases the lock of the hook 55 (⑥),

When the lock is released, the opening spring 54 pushes the main lever 53 forward (⑦),

When the main lever 53 advances, the other end of the operating arm 52 is pushed and the drive shaft 33 connected to one end is pulled down (⑧).

Referring to [C] of FIG. 3, the main lever 53 is advanced, but the rotary latch 61 and the trigger latch 62 are returned to their original states.

In order to automatically return the rotary latch 61 and the trigger latch 62 to their original positions by the force of the main lever 53 moving forward, a return bar 73 protrudes from the edge of the rotary latch 61 and is provided. , the main lever 53 is provided with a return wall 71 for pushing the return bar 73 when moving forward.

When the rotary latch 61 rotates forward, the return bar 73 is positioned in front of the return wall 71 , and when the main lever 53 is fully charged, the return wall 71 pushes the return bar 73 . The rotary latch 61 is reversely rotated, and the trigger latch 62 has a property of being rotated forward by the spring 65. By being caught at (62a), the rotary latch 61 and the trigger latch 62 are returned to their original positions.

When the accident in the power system is resolved, the operator manually rotates the cam 58 using an operation tool to input (close) the vacuum interrupter 30 so that the load switch can operate normally.

When the cam 58 is rotated, the connecting member 57 rotates forward, the forward rotating connecting member 57 pushes the main lever 53 backward, and one end of the connecting member 57 is connected to the hook 55 . will fall asleep

In the above description of the present invention, a driving device for a load switch with a fuse having a specific shape and structure has been described with reference to the accompanying drawings, but the present invention can be variously modified and changed by those skilled in the art, and these modifications and changes It should be construed as belonging to the protection scope of the present invention.

10: body 11: vertical part
13: horizontal part 15: external connection terminal
17: internal connection terminal 19: insulation cover
20 " Enclosure 30 : Vacuum Interrupter
31: insulating rod 33: drive shaft
40: Hallyu fuse 41: striker
43: flexible plastic rod 45: insulating tube
50: drive means 51: base
52: control arm 53: main lever
54: open spring 55: hook
56: release lever 57: connecting member
60: amplification unit 61: rotary latch
62: trigger latch 63: amplification spring
64: open latch 71: return wall
73: return bar

Claims (4)

A driving device for driving a load switch with a fuse comprising a vacuum interrupter for opening and closing a line side and a load side, and a current-limiting fuse connected to the load side,

a driving means for driving the vacuum interrupter to open when the current-limiting fuse is melted;
In the driving device for a load switch with a fuse comprising a; an amplification unit for amplifying the force of the striker operating when the current-limiting fuse is fused and transmitting it to the driving means,

a flexible plastic rod that transmits the force of the Hallyu fuse striker to the amplification unit;
The driving device for a load switch with a fuse further comprises an insulating tube accommodating the flexible plastic rod and guiding the movement of the flexible plastic rod. A driving device for driving a load switch with a fuse comprising a vacuum interrupter for opening and closing a line side and a load side, and a current-limiting fuse connected to the load side,

a driving means for driving the vacuum interrupter to open when the current-limiting fuse is melted;
In the driving device for a load switch with a fuse comprising a; an amplification unit for amplifying the force of the striker operating when the current-limiting fuse is fused and transmitting it to the driving means,

The driving means
an operation arm connected to the vacuum interrupter;
a main lever that pushes or pulls the operation arm forward and backward to open and close the vacuum interrupter;
and a power assembly for opening the vacuum interrupter by advancing the main lever locked in a reverse state when the current-limiting fuse is cut by elastic force,

The amplification unit is
rotary latch,
a trigger latch engaged with the rotary latch and released from engagement by the force of the current-limiting fuse striker;
an amplifying spring for rotating the rotary latch with elastic force;
and an open lever for releasing the lock of the power assembly by the rotational force of the rotary latch. 3. The method of claim 2,
a return bar protruding from the rotary latch;
and a return wall provided on the main lever and configured to push the return bar of the rotary latch forwardly rotated to open it when the main lever is advanced to rotate the rotary latch in a reverse direction to return the rotary latch to its original position. A drive device for an attached load switchgear. delete

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