KR20160043288A - Epoxy mold canister fuse holder - Google Patents

Abstract

The present invention relates to an epoxy mold canister fuse holder. The epoxy mold canister fuse holder includes: a main body molded with an epoxy resin and having a fuse link insertion unit inserted therein; a power supply input unit positioned in a direction perpendicular to an installation direction of a fuse link of the main body and formed as a dead break interface; a load side formed as a socket on one end of the body; and a fuse power supply unit into which an insulating dummy cap, formed on an opposite side of the load side in the main body is inserted. The present invention can inspect and replace the fuse link without separating a fuse holder and a potential transformer.

Description

[0001] EPOXY MOLD CANISTER FUSE HOLDER [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an epoxy mold canister fuse holder having an overload protection fuse installed in a transformer for a meter installed in an underground switchgear and used for an operation power source for an underground switchgear.

The meter transformer is a type of transformer that is used for converting the high voltage to a low voltage at a certain rate, supplying it to the instrument and relay, or for operating power of the switch.

This instrument transformer consists of a high voltage winding on the primary side, a low voltage winding on the secondary side, and an iron core. It protects the transformer during overloading, such as a short circuit on the secondary load side during use and also protects the transformer from primary side high voltage winding or high voltage charging A fuse is installed at the primary power input terminal to electrically isolate the power supply line in the event of a breakdown of the insulation.

Hereinafter, a conventional transformer for a fuse-equipped instrument will be described with reference to FIGS. 1 and 2. FIG.

1 is an external perspective view of a conventional transformer for a fuse equipped with a fuse.

1 has a structure in which a high voltage charging part such as a fuse link 11, a fuse holder conductor 12.13 and an input conductor 14 is exposed to the outside on the upper part of the main body 10, There is a problem that the insulation distance can not be ensured when it is installed in the middle-sized switchgear cabinet.

Therefore, the instrument transformer of FIG. 1 is mainly a transformer for instruments used in a closed switchboard, and is unsuitable for use as an operating power source for ground-based switches.

2 is a side sectional view of a conventional transformer for a built-in fuse-type instrument.

2, a fuse link inserting space 24 is provided in the main body 20 above the instrument transformer 21 so that the transformer 21 for the instrument and the fuse mounting part 23 are integrally formed. It is a built-in instrument transformer.

2 includes a fuse link insertion space 24 inside the input conductor 22 and an input conductor 22 located on the power input side of the transformer for fuse built-in type. And the load side conductor 26 to which the high voltage primary winding 25 of the instrument transformer 21 is connected is fixed to the opposite side so that the instrument transformer 21 and the fuse mounting portion 26 are formed by molding with the epoxy resin together with the instrument transformer 21. [ (23) are integrally formed.

A fuse link 28 is inserted into a dummy bushing engagement opening 27 located at the rear end of the load side conductor 26 and a dummy bushing 29 made of a rubber- And then the fuse link 28 is attached to the metal cap 30.

In the conventional transformer for a built-in fuse with a built-in structure, when the high-voltage charging part including the high-voltage primary winding 25 is damaged by insulation failure or deterioration, the epoxy insulation layer is destroyed by high temperature and pressure If such an insulation breakdown occurs at the fuse front end input conductor 22 region, the fuse is not fused.

If the fuse is not fused, the failure time is prolonged, and thus the accident spreading in the power supply system is increased.

In addition, the input conductor 22 and the load side conductor 26 fixed in the fuse mounting portion 23 of the conventional transformer for a fuse-embedded type instrument are different in coefficient of linear expansion from the epoxy resin, so that these interfaces can be relaxed at the time of molding.

Therefore, partial discharge occurs at the relaxed interface, which causes deterioration of the dielectric strength and shortens the service life of the instrument transformer.

Korean Patent Publication No. 2001-0095261 (published on November 03, 2001)

SUMMARY OF THE INVENTION The present invention provides a voltage transformer (VT) for use as an operating power source for an underground switch, in which a transformer for a meter and a fuse portion are separated from each other, The power source side is a dead break interface (IEEE Std 386) and the load side is a socket type. The power input part is located at a right angle to the direction in which the fuse link is mounted. The fuse link is mounted through the socket opening of the fuse power supply unit into which the insulating dummy cap equipped with the insulating dummy plug located on the opposite side of the load side socket is inserted and is easily coupled to the meter transformer by the plate attached to the front side of the load side socket.

 Metal such as a charging conductor, a voltage detecting conductor, a grounding shield, a fuse shield, and a coupling nut fixed in the main body is different in coefficient of linear expansion during molding, so that the epoxy contact interface is relaxed.

Therefore, there is a possibility that a partial discharge is generated at this interface, and the above-mentioned metal surface is subjected to a semi-conductive treatment to suppress the generation of partial discharge.

In addition, the load-side conductor shield fastened to the outer periphery of the load side conductor coincides with the input conductor of the instrument transformer inserted inside the socket opening and the inner periphery of the socket opening to which the load side conductor is in contact, It is an object of the present invention to provide an epoxy molded canister fuse holder which can improve the dielectric strength, check whether the fuse link is broken by the fuse check terminal, and replace the fuse link without detaching the fuse holder and the instrument transformer.

In order to achieve the above object, an epoxy mold canister fuse holder according to an embodiment of the present invention includes a cylindrical fuse link mounting portion formed therein, and a body molded from an epoxy resin, An input side ground shield fixed on a front surface of a power input side; and an elbow mounting nut fixed on an inner side surface of the input side ground shield, the input side ground shield comprising: And a conductor connected to the fuse power supply unit. The fuse power supply unit fixed in the direction of mounting the fuse link to the outer periphery of the fixed conductor of the fuse power supply unit is a socket-shaped load-side terminal of the main body, A load-side socket opening to be engaged: through the inner center of the socket A load side conductor connected to the outer periphery of the load side conductor in the direction of the socket opening; a load side conductor fuse shielded in the fuse link direction on the outer side of the load side conductor; a plurality of gauges positioned uniformly in front of the load side socket opening; Insulated dummy plug for inserting the insulated dummy plug into the main body, the insulated dummy plug housing having a socket opening formed in the fuse power portion of the main body, An insulation dummy cap comprising an insulation dummy plug housing with a dummy plug and a fuse power source fixed to a front end of the insulation dummy plug to energize the fuse link with a fixed conductor of a fuse power source. Fuse power envelope Ground shield: An insulation dummy cap fastening nut fixed to the inner one side of a power supply grounding shield: a circular voltage detecting conductor wrapped around the load side conductor and molded in the body: a fuse check terminal connected to one end of the voltage detection conductor: And includes fixed ground conductors.

The voltage detecting conductor detects a voltage applied to the epoxy insulator in the energized state and confirms whether the fuse link is disconnected or not by detecting the voltage between the fuse check terminal connected to the outside of the voltage detecting conductor and the grounding conductor. .

After the fuse link is inspected, the grounding conductor fixed to the outside of the main body and the fuse check terminal are grounded by fastening with a grounding bolt.

The fuse shield is divided into the fuse power supply fixed conductor fuse shield and the load side conductor fuse shield, and is formed in a cylindrical shape.

The fuse power supply fixed conductor fuse shield and the load side conductor fuse shield have different inner diameters, and the fuse shield having a large outer diameter is characterized in that edge portions of the fuse shield are curled outward.

On the other hand, the fuse shield for a fuse power supply and the load-side conductor fuse shield can be integrated into one, so as to surround the entire outer periphery of the input conductor, the fuse link, and the load side fixed conductor.

The insulating dummy plug is made of silicon or synthetic rubber.

The fuse shield and the load-side conductor shield may be formed of a metal lath or a thin metal plate.

A semiconductive resin is applied to the fuse shield and the load-side conductor shield.

The input conductor, the fuse power supply fixed conductor and the load side conductor are coated with a semiconductive resin at an interface between the input conductor, the fuse power supply, and the load side conductor.

Also, a semiconductive resin is applied to the interface between the grounding shield (input side, fuse power source) and the grounding shield fixed to the epoxy shielding resin during molding.

The voltage detecting conductor and the fuse check terminal are also coated with a semiconductive resin at an interface where the epoxy resin is connected when molding.

When the metal is pre-treated with the metal, the metal and the epoxy resin are relaxed at the interface at the time of molding due to the difference in linear expansion coefficient, and partial discharge occurs at the relaxed interface. A semiconductive resin is applied to the surface of the metal as described above to form a semiconductive resin coated on the metal at the time of molding so as to be transferred to the epoxy interface so as to make the relaxed interface coincident so as not to generate a partial discharge will be.

The semiconductive resin is characterized in that any one of carbon, graphite, zinc, silver and aluminum is composed of a semiconducting material mixed with a synthetic resin.

Semi-conductive resin can be applied to the exposed portion of the main body except for the dead brake interface of the power input unit, the load side socket, and the insulation dummy cap inserting portion of the fuse power source portion.

The epoxy mold canister fuse holder of the present invention configured as described above has a structure in which a fuse device is separately mounted on a transformer for a meter, unlike a conventional transformer for a built-in fuse.

In the conventional transformer for a built-in fuse-type instrument, when insulation breakdown occurs at the input terminal of the fuse link due to insulation failure of the transformer part for the instrument, the fuse is not fused and a secondary accident occurs, According to the present invention, since the fuse holder is separately mounted, even if the insulation breakdown occurs on the transformer side of the instrument, the secondary accident can be prevented.

According to the present invention, an input-side grounding shield that surrounds the input conductor and is fixed to the input-side front surface alleviates an electric field around the input conductor, and an elbow mounting nut for fixing the elbow is fixed.

The load side has an opening of a load side socket into which an input plug of a transformer for a meter is inserted, and a plurality of plate fastening nuts fixed to the front surface of the load side socket has an advantage of facilitating engagement with a transformer for a meter.

The load-side conductor shield, which is fastened to the outer periphery of the load-side conductor, is hemispherically shaped in the body toward the socket opening. The load-side socket opening is in contact with the input conductor of the instrument transformer inserted in the load- So that the partial discharge is not generated at this portion.

In addition, there is a function to check whether the fuse link is disconnected or not by detecting the voltage between the fuse check terminal connected to one side of the voltage detecting conductor and the grounding conductor which surrounds the load side conductor and maintains the insulation distance. At all times, Is grounded with a grounding bolt, so that electrical safety is added.

The fuse power source grounding shield, which is fixed to the front surface of the fuse power source, surrounds the socket opening, mitigates an electric field formed around the fuse power source fixed conductor, and the insulating dummy cap tightening nut is fixed to the rear surface to mount the insulation dummy plug.

According to the present invention, it is possible to provide a power supply device and a method of manufacturing the same, which can prevent damage to the input and output terminals of the fuse power supply, The fuse inspection terminal is formed by applying a semiconductive resin to the interface contacting the epoxy resin and applying a semiconductive resin to the fuse power supply fixed conductor fuse shield and the load side conductor fuse shield to loosen these interfaces due to the difference in coefficient of linear expansion during molding There is an effect of preventing partial discharge.

According to the present invention, the fuse power supply fixed conductor fuse shield and the load side conductor fuse shield that surround the fuse link have the same potential as the fuse link, so that the partial discharge is not generated in the fuse link inserting space.

The insulation dummy cap is composed of an insulation dummy plug housing and an insulation dummy plug housing to which the insulation dummy plug is fastened. The fuse power source fixed to the front of the insulation dummy plug. The outer side of the movable conductor is a fuse power source. The insulated dummy plug which is in close contact with the inner surface of the opening of the socket of the fuse power source is made of silicon or synthetic rubber so as to insulate the charging conductor of the fuse power source in the main body.

The power supply side of the epoxy mold canister fuse hold of the present invention as described above is a dead brake interface of IEEE Std 386, which facilitates connection of the elbow and a plug-type load side of the epoxy molded canister fuse holder.

The present invention also has the advantage of checking and replacing the fuse link without separating the fuse holder and the instrument transformer.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of a conventional transformer with a fuse mounted on the outside of a main body; FIG.
2 is a side cross-sectional view of a conventional transformer for a built-in fuse.
3 is an external perspective view of an epoxy mold canister fuse holder of the present invention.
Figure 4 is a side cross-sectional view of an epoxy mold canister fuse holder of the present invention.

Hereinafter, an epoxy mold canister fuse holder according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 3 is an external perspective view of an epoxy mold canister fuse holder according to an embodiment of the present invention, and FIG. 4 is a side sectional view of the epoxy mold canister fuse holder.

3 and 4, the main body 100 is formed of an epoxy resin, and includes a power input portion 50 through which power is input, a load side 60 and an insulation dummy cap 90 which are coupled with input terminals of the instrumentation transformer, And a fuse link inserting space 71 in which the fuse link 70 is inserted into the center of the main body 100 through the socket opening 83 of the fuse power source part in the fuse power source unit 80 And the power input unit 50 is positioned at a direction perpendicular to the fuse link 70 in the main body 100. [

The power is input by connecting an elbow to the Dead Brake interface 51 of the power input unit 50. The input conductor 52 is located at the center of the dead brake interface 51 and the elbow conductor insertion And the multi-connector 56 is fixed to the circumferential surface of the elbow conductor insertion opening 53 so as to be in electrical contact with the circumferential surface.

The input side ground shield 54 surrounding the input conductor 52 at a predetermined distance is disposed on the front surface of the power input unit 50 and the input side ground shield 54 is provided with a plurality of elbow mounting The nut 55 is fixed.

The inner diameter of the input-side ground shield 54 protrudes outside the main body 100 at a right angle to the mounting surface, and the elbow outer ground portion is connected to the protrusion.

The corner of the inner diameter side right corner of the input side ground shield 54 is hemispherical.

The input-side ground shield 54 alleviates an electric field formed around the input conductor 52.

The input conductor 52 and the fuse power supply fixed conductor 81 are connected to each other by a conductive conductor 57 so that electric power is supplied.

A fuse power source grounding shield 85 surrounding the socket opening 83 of the fuse power source unit is connected to the fuse power source socket opening 83 through the fuse power source socket opening 83, And is fixed in the main body 100 toward the front surface of the main body 83.

The ground shield 85 of the fuse power source part has a plurality of insulated dummy cap fastening nuts 85 for relieving the electric field formed around the fuse power source fixed conductor 81 and having the inner diameter side right corner thereof hemispherical and mounting the insulation dummy cap 90 (86) is fixed to the rear surface.

The insulation dummy cap 90 is composed of an insulation dummy plug 91 and an insulation dummy plug housing 92 to which the insulation dummy plug 91 is fastened.

The insulation dummy plug 91 made of silicone or synthetic rubber is in close contact with the inner surface 84 of the socket opening of the fuse power source to insulate the high voltage charging portion and a fuse power source movable conductor 94 fixed to the front end of the insulation dummy plug 91 The fuse power source movable conductor outer surface 95 is connected to the fuse power source fixed conductor inner surface 82 and the fuse power source movable conductor groove 96 is connected to the fuse link connecting cap 72 to be energized.

When the fuse link 70 positioned at the center of the main body 100 is inserted into the fuse link insertion space 71 through the fuse power source socket opening 83 of the fuse power source unit 80, The cap 90 is inserted into the socket opening 83 of the fuse power source and fastened to the insulation dummy cap tightening nut 86 with bolts through the insulation dummy cap mounting hole 93 to be mounted on the main body 100.

The load side 60 has a load side socket opening 65 into which the plug input end of the instrument transformer is inserted and a plurality of plate fastening nuts 66 fixed to the front surface of the load side socket opening 65, Tighten.

A load-side conductor 61 is fixed in the inner central body 100 of the load-side socket opening 65. A hemispherical load-side conductor shield 67 is fixed to the load-side socket opening 65 Lt; / RTI >

A load side conductor groove 62 is provided in the main body 100 of the load side conductor 61 located in the main body 100 and a spring 63 is connected to the spring fixing tab 64 located at the center of the load side conductor groove 62. [ And the spring 63 is connected to the fuse link contact cap 72 to energize the spring 63. When the fuse link 70 is inserted, the spring 63 acts to mitigate the impact.

A voltage detecting conductor 103 is disposed inside the main body 100 while keeping the outer circumference of the load side conductor 61 at a predetermined distance and a fuse check terminal 102 is connected to one side of the voltage detecting conductor 103 .

And a grounding conductor 105 fixed to the outside of the main body 100 outside the fuse check terminal 102.

The voltage detecting conductor 103 detects a voltage applied in the epoxy insulator and checks whether or not the fuse link 70 is disconnected with or without voltage detection between the fuse check terminal 102 and the ground conductor 105.

The fuse check terminal 102 checks whether or not the fuse link 70 is disconnected, and then connects the grounding bolt 104 to the grounding conductor 105 to ground.

A cylindrical fuse power source fixed conductor fuse shield 75 surrounding the fuse link 70 is fixed to the outside of the fuse power source fixed conductor 81 and the fuse link 70 Of the load-side conductor fuse shield 76 is fixed.

The fuse-power fixed conductor fuse shield 75 and the load-side conductor fuse shield 76 are different in size from each other, and their ends are crossed by several millimeters.

The distance between the fuse-power fixed conductor fuse shield 75 and the load-side conductor fuse shield 76 maintains a sufficient distance to withstand the dielectric strength.

The fuse shields 75 and 76 do not need to be distinguished from each other in terms of their inner and outer positional arrangements. The fuse shield located inside is cylindrical, the fuse shield located outside is also cylindrical, .

The fuse power supply fixed conductor fuse shield 75 and the load side conductor fuse shield 76 are connected to the fuse link 70 and the fuse link 70 in order to prevent partial discharge generated in the fuse link 70 and the fuse link insertion space 71 And the shape of the outer end of the fuse shield located on the outer side is wound to the outside, has the purpose of alleviating the electric field of this portion.

On the other hand, the fuse-power fixed conductor fuse shield 75 and the load-side conductor fuse shield 76 are integrally integrated without being distinguished from each other so as to cover the entire outer periphery of the fuse power source fixed conductor 81, the fuse link 70 and the load side conductor 61 May be formed.

The fuse-power fixed conductor fuse shield 75 and the load-side conductor fuse shield 76 are formed of a metal lath or a thin metal plate.

The input conductor 52, the fuse power supply fixed conductor 81, the load side conductor 61, the elbow mounting nut 55, the insulating dummy cap lock nut 86, the voltage detecting conductor (not shown) 103, and the ground shields 54, 85, etc. are rounded in order to alleviate electric field concentration.

The input conductor 52, the fuse power supply fixed conductor 81, the load side conductor 61, the elbow mounting nut 55, the grounding shields 54 and 85 and the elbow mounting nut 55, (86), and the voltage detecting conductor (103) are coated with semiconductive resin at the interface where the epoxy resin is contacted and molded.

In addition, the fuse power supply fixed conductor fuse shield 75 and the load side conductor fuse shield 76 and the load side conductor shield 68 are also coated with a semiconductive resin.

Since the epoxy resin and the metal have different thermal expansion coefficients, they are relaxed at the interface when they are formed. When the high voltage is charged, partial discharge occurs at the relaxed interface. When the semiconductive resin is applied as described above, The conductive resin is transferred to the epoxy interface, and the relaxed interface becomes a coincidence, so that the partial discharge is not generated.

There is a body semi-conductive processing portion 101 which is grounded by applying a semiconductive resin to the exposed portion on the outside of the main body 100 excluding the connecting portion on the input side, the fuse power portion and the load side.

The outer body semi-conductive treatment portion 101 of the main body 100 is electrically stable by relaxing the electric field formed around the high-voltage charging conductor fixed in the main body 100, It is possible to provide an epoxy mold canister fuse holder of the present invention which is safe and can be installed without being limited in proximity, and which is excellent in dielectric strength and easy to install.

100:
50: power input unit 51: dead brake interface
52: input conductor 53: elbow conductor insertion opening
54: input side ground shield 55: elbow mounting nut
56: Multi-connector 57: Conductor conductor
60: load side 61: load side conductor
62: Load side conductor groove 63: Spring
64: spring fixing tab 65: load side socket opening
66: Plate fastening nut 67: Load conductor shield
70: Fuse link 71: Fuse link insertion space
72: Fuse link contact cap 75: Fuse power supply fixed conductor fuse shield
76: load side conductor fuse shield 80: fuse power source
81: Fuse power supply fixed conductor 82: Fuse power supply fixed conductor inner surface
83: Fuse power source socket opening 84: Fuse power source socket opening inner surface
85: Fuse power ground shield 86: Insulation dummy cap tightening nut
90: Insulation dummy cap 91: Insulation dummy plug
92: Insulation dummy plug housing 93: Insulation dummy cap mounting hole
94: Fuse power supply moving conductor 95: Fuse power supply moving conductor outer face
96: fuse power source moving conductor groove 101: main body anti-conduction treatment section
102: Fuse check terminal 103: Voltage detecting conductor
104: grounding bolt 105: grounding conductor

Claims (10)

A main body formed of an epoxy resin and having a fuse link insertion portion formed therein;
A power input unit positioned at a right angle to a direction in which the fuse link of the main body is mounted and formed by a dead brake interface;
A load side formed at one end of the main body with a socket;
A fuse power supply unit for inserting an insulation dummy cap formed on a side opposite to the load side in the main body; / RTI >
Wherein a conductor or metal molded and fixed in the body is coated with a semiconductive resin at an interface connected to the epoxy resin.
The method according to claim 1,
In the power input section,
An input conductor formed through the center of the dead brake interface;
An input side ground shield which surrounds the periphery of the input conductor and is fixed to the input side front surface; Is formed on the upper surface of the fuse holder.
The method according to claim 1,
In the fuse power supply unit,
Insulated dummy cap with insulated dummy plug;
A fuse power source movable conductor fixed to a front end of the insulation dummy plug;
A socket opening through which the insulating dummy cap is inserted;
A fuse power source fixed conductor formed inside the socket opening;
A fuse power source grounding shield surrounding the socket opening; And
A fuse power source fixed conductor fuse shield fastened to an outer periphery of the fuse power source fixed conductor; Is formed on the upper surface of the fuse holder.
The method according to claim 1,
On the load side,
A load side socket opening into which the input side of the meter transformer is inserted;
A load side conductor passing through an inner center of the load side socket opening;
A load side conductor shield coupled to the outer periphery of the load side conductor in the direction of the load side socket opening; And
A load side conductor fuse shield coupled to the outer periphery of the load side conductor; Is formed on the upper surface of the fuse holder.
The method according to claim 1,
In the load-side main body,
A voltage detecting conductor surrounding the outer periphery of the load side conductor;
A fuse check terminal connected to the outside of the voltage detecting conductor; Is fixed to the outside of the main body.
The method according to claim 1,
Wherein the fuse link is mounted in the center of the body through the socket opening of the fuse power supply.
The method according to claim 3 or 4,
The fuse-power fixed conductor fuse shield and the load-side conductor fuse shield enclose the fuse link in a cylindrical shape and have different inner diameters, overlapping end portions, and a fuse shield having a large outer diameter, An epoxy molded canister fuse holder.
8. The method of claim 7,
Wherein the fuse power source fixed conductor fuse shield and the load side conductor fuse shield are formed by metallathes or thin metal foils.
8. The method of claim 7,
The fuse power source fixed conductor fuse shield and the load side conductor fuse shield are integrally formed to surround the entire periphery of the fuse power source fixed conductor, the fuse link and the load side conductor, and the edge portion of the fuse shield is curled outward Characterized by an epoxy mold canister fuse holder.
The method according to claim 1,
Wherein a semi-conductive portion coated with a semiconductive resin is formed on an exposed portion of the main body of the epoxy mold canister.

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