WO2020209509A1

WO2020209509A1 - Device for preventing temperature rise of air circuit breaker

Info

Publication number: WO2020209509A1
Application number: PCT/KR2020/003298
Authority: WO
Inventors: 김영국
Original assignee: 엘에스일렉트릭㈜
Priority date: 2019-04-08
Filing date: 2020-03-10
Publication date: 2020-10-15
Also published as: KR20200118701A

Abstract

In the present invention, at least one thermoelectric module is provided in a switchboard busbar to which input and output terminals of a cradle are connected, and an air circuit breaker is cooled using the thermoelectric module so as to prevent excessive temperature rise of the air circuit breaker. Therefore, there is an advantage in that temperature rise of an air circuit breaker can be prevented without increasing the radiation area of the air circuit breaker.

Description

Temperature rise prevention device for air circuit breaker

The present invention relates to a temperature rise prevention device for an air circuit breaker, and to a temperature rise prevention device for an air circuit breaker that prevents excessive temperature rise of the air circuit breaker.

In general, air circuit breakers (ACB) are installed on low-voltage distribution lines to protect people and loads by blocking the circuit with air as an extinguishing medium when abnormal currents such as overcurrent, short circuit and ground fault occur. It is an industrial power device.

These air circuit breakers can be classified into a fixed type and a withdrawal type, and the withdrawal air circuit breaker differs from a fixed air circuit breaker in that it has a structure that allows the circuit breaker body to be inserted or withdrawn into a cradle.

The draw-out type air circuit breaker has the advantage of maximizing its performance by installing devices that perform an additional function of the circuit breaker on the cradle, and thus, is positioned as a basic type of air circuit breaker.

1 is a perspective view showing a three-phase withdrawal type air circuit breaker is shown.

As shown in Figure 1, the withdrawal type air circuit breaker is configured such that the circuit breaker body 10 is drawn in or drawn out of the cradle 20.

Three main body-side input terminals 12 protrude from the upper side of the rear of the circuit breaker main body 10, and three main body-side output terminals 14 protrude from the lower side.

Meanwhile, three cradle-side input terminals 22 protrude from the upper side of the rear surface of the cradle 20, and three cradle-side output terminals 24 protrude from the lower side.

When the cradle side input terminal 22 and the output terminal 24 are connected to a busbar (not shown) of the switchboard, and the breaker body 10 is inserted into the cradle 20, the switchboard side circuit and the breaker side circuit are It is electrically connected and the air breaker operates.

Fig. 2 shows a cradle-side terminal portion A of a three-phase circuit breaker.

As shown in FIG. 2, the cradle 20 of a conventional air circuit breaker is provided with an input terminal 22 and an output terminal 24 for each phase (R, S, T).

The input terminal 22 and the output terminal 24 are inserted into the fingers (26a, 26b) which are conductive structures, and the input-side fingers (26a) and the output-side fingers (26b) of each phase are inserted into a pair of insulating members (28). It is fixed.

In addition, the input terminal 22 and the output terminal 24 are connected to a bus bar (not shown) of the switchboard for each phase to be electrically energized, thereby providing driving power to the load side.

However, in the conventional air circuit breaker as described above, when the input terminal and output terminal on the cradle side are coupled to the bus bar of the switchboard and the driving power is supplied to the load side, the temperature of the air circuit breaker and the switchboard rises, but the heat dissipation area of the air circuit breaker Is not only determined by the IEC (International Electrotechnical Commission) standard, but also because the switchboard has been miniaturized, there is a problem that it is difficult to effectively radiate the elevated temperature due to the application of the driving power.

The present invention has been conceived to solve the above-described problems, and an object thereof is to provide a temperature rise prevention device for an air circuit breaker that prevents excessive temperature rise of the air circuit breaker.

An object of the present invention described above is a temperature rise prevention device for an air circuit breaker connected to a bus bar of a switchboard to supply driving power to a load, which is provided in the bus bar to cool the heat generated from the circuit breaker and the bus bar. It is achieved by providing a temperature rise prevention device for an air circuit breaker, characterized in that it comprises at least one thermoelectric module.

In addition, a seating groove is formed in the bus bar so that the thermoelectric module is seated.

In addition, a first fastening hole is formed near the edge of the thermoelectric module, and a second fastening hole is formed in the mounting groove to correspond to the first fastening hole, so that the fastening member is fastened to the first fastening hole and the second fastening hole. It is characterized in that the thermoelectric module is connected to the busbar by being fastened through the hole.

In addition, a fitting portion is formed at one end of the thermoelectric module, and a fitting groove is formed in the vicinity of the seating groove among the bus bars to fit the fitting portion.

In addition, a locking portion is formed at an upper end of the fitting portion, and a locking groove is formed in the vicinity of the fitting groove to fit the locking portion.

In addition, protrusions are formed at both ends of the thermoelectric module, and protrusion grooves are formed in the vicinity of the seating groove to fit the protrusions.

In addition, protrusion grooves are formed at both ends of the thermoelectric module, and protrusions are formed in the vicinity of the seating groove to fit into the protrusion grooves.

In addition, a handle portion is formed on one surface of the thermoelectric module.

In addition, the thermoelectric module is provided with a switching unit, the switching unit is turned on or off depending on whether the overcurrent is applied to the busbar side, the thermoelectric module may be operated.

In addition, it characterized in that it further comprises a temperature sensing unit for sensing the temperature of the circuit breaker, and a control unit for adjusting the operation of the thermoelectric module according to whether the temperature sensed through the temperature sensing unit exceeds a reference temperature.

In addition, the switching unit is characterized in that consisting of a MOSFET.

As described above, the temperature rise prevention device for an air circuit breaker according to the present invention includes at least one thermoelectric module in the busbar of the switchboard to which the input terminal and the output terminal of the cradle are connected, and cooling the circuit breaker using the thermoelectric module to cause excessive temperature. Since the rise is prevented, there is an effect of preventing the temperature rise of the air circuit breaker without increasing the heat dissipation area of the air circuit breaker.

In addition, since it is not necessary to increase the heat dissipation area of the air circuit breaker, there is an effect of preventing the temperature rise of the air circuit breaker while satisfying the IEC standard.

In addition, there is an effect of simplifying the overall structure of the temperature rise prevention device by allowing the thermoelectric module to operate dynamically using a driving power source without installing a separate power source.

In addition, there is an effect of simplifying the overall structure of the temperature rise prevention device by operating the thermoelectric module using current value information such as an overcurrent relay without installing a separate sensor.

1 is a perspective view showing a conventional air circuit breaker.

2 is a perspective view showing a terminal portion of a cradle provided in a conventional air circuit breaker.

3 is a perspective view showing a state in which a thermoelectric module is provided in a bus bar to which an air circuit breaker is connected according to the first embodiment of the present invention.

4 is another perspective view showing a state in which a thermoelectric module is provided in a bus bar to which an air circuit breaker is connected according to the first embodiment of the present invention.

5 is a block diagram showing a thermoelectric module according to a first embodiment of the present invention.

6 is an exploded perspective view showing a busbar and a thermoelectric module to which an air circuit breaker is connected according to the first embodiment of the present invention.

7 is an exploded perspective view showing a busbar and a thermoelectric module to which an air circuit breaker is connected according to a second embodiment of the present invention.

8 is an exploded perspective view showing a busbar and a thermoelectric module to which an air circuit breaker is connected according to a third embodiment of the present invention.

9 is an exploded perspective view showing a busbar and a thermoelectric module to which an air circuit breaker is connected according to a fourth embodiment of the present invention.

10 is an exploded perspective view showing a busbar and a thermoelectric module to which an air circuit breaker is connected according to a fifth embodiment of the present invention.

Hereinafter, a temperature rise prevention device for an air circuit breaker according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view showing a state in which a thermoelectric module is provided in a bus bar to which an air circuit breaker is connected according to a first embodiment of the present invention, and FIG. 4 is a thermoelectric module in a bus bar to which an air circuit breaker is connected according to the first embodiment of the present invention. Another perspective view showing the provided state, Figure 5 is a configuration diagram showing the thermoelectric module according to the first embodiment of the present invention, Figure 6 is a busbar and the thermoelectric module connected to the air circuit breaker according to the first embodiment of the present invention Showing an exploded perspective view.

3 to 6, the temperature rise prevention device for an air circuit breaker according to the first embodiment of the present invention is provided in the bus bar 200 of the switchboard to which the air circuit breaker 100 is connected, and (100) And, the air circuit breaker 100 prevents a temperature increase in the vicinity of the bus bar 200 provided.

In this case, the air circuit breaker 100 may include a circuit breaker body 110, a cradle 130 having an input terminal and an output terminal connected to the bus bar 200 through which the circuit breaker body 110 is drawn in and out. have.

The circuit breaker body 110 is provided with a mover (not shown) and a stator (not shown), and the mover and the stator are turned on or off, so that the energization state can be adjusted.

In addition, the circuit breaker body 110 is electrically connected to or disconnected from the cradle 130 while being drawn in or out of the cradle 130, so that the driving power is supplied to the load side.

The cradle 130 is a structure through which the circuit breaker body 110 is drawn in or out, and additional devices for performing an additional function of the air circuit breaker 100 may be provided.

Here, the cradle 130 may be provided with an input terminal (not shown) and an output terminal (not shown) for each phase, and the input terminal and the output terminal are connected to the bus bar 200 provided in the switchboard. Drive power can be supplied to the load side.

Meanwhile, the air circuit breaker 100 is prevented from rising to a certain temperature through a temperature increase prevention device, and the temperature increase prevention device may include at least one thermoelectric module 300.

The thermoelectric module 300 is provided with at least one in the bus bar 200 to cool the heat generated from the air circuit breaker 100 or the bus bar 200 to reduce the temperature of the air circuit breaker 100 It can prevent rising above a certain temperature.

Here, as shown in FIG. 5, the thermoelectric module 300 may include a converter 301, an insulation unit 303, and a thermoelectric element 305.

The converter 301 may convert the AC current flowing into the circuit breaker 100 into a DC current to be applied to the load side.

The insulating part 303 is positioned between one end of the converter 301 and the thermoelectric element 305 and adjacent to the other end of the thermoelectric element 305 to connect the thermoelectric module 300 and a driving power source. Can be insulated.

The thermoelectric element 305 is an element that generates a thermoelectric effect, and may be formed of a P/N semiconductor element or the like.

Specifically, the thermoelectric element 305 performs a cooling function with a Peltier effect (thermoelectric effect).

The Peltier effect is a phenomenon in which heat or endothermic heat occurs in addition to Joule heat at the junction when different types of conductors are joined to flow current.

In the thermoelectric element 305 in which the Peltier effect occurs, when a direct current flows, heat is transferred from one conductor to the other, so that one conductor becomes cold and the other conductor becomes hot.

In this case, the hot side is prevented from overheating with a heat sink, and the cold side is used for cooling.

Therefore, the present invention uses the thermoelectric element 305 having a Peltier effect to cool the heat in the circuit breaker 100 and the bus bar 200 to prevent excessive temperature rise in the air circuit breaker 100. Can be prevented.

Meanwhile, at least one thermoelectric module 300 may be provided in the bus bar 200, and a seating groove 210 may be further formed in the bus bar 200.

The seating groove 210 may be formed at one end or both ends of the bus bar 200, and the thermoelectric module 300 is connected to the bus bar 200 while being seated in the seating groove 210. I can.

Here, a first fastening hole 310 may be formed near an edge of the thermoelectric module 300, and a second fastening hole 220 so as to correspond to the first fastening hole 310 in the mounting groove 210 Can be formed.

Accordingly, a fastening member 400 such as a bolt is fastened through the first fastening hole 310 and the second fastening hole 220 so that the thermoelectric module 300 is seated in the mounting groove 210 It may be connected to the bus bar 200.

Meanwhile, the thermoelectric module 300 may further include a switching unit (not shown).

The switching unit may be made of a MOSFET, etc., and when a predetermined current or more flows into the busbar 200, the air circuit breaker (via the thermoelectric module 300) is turned on to cause the thermoelectric module 300 to operate. 100) etc. can be allowed to cool.

Here, the current value at which the switching unit is operated may be variously set in consideration of the type of the circuit breaker 100 or the rated current value.

In addition, the air circuit breaker 100 may further include a temperature sensing unit (not shown) and a control unit (not shown).

The temperature sensing unit may be formed of a detection sensor or the like, and is provided in the air circuit breaker 100 to detect the temperature of the air circuit breaker 100.

Here, the temperature sensing unit may be located inside the air circuit breaker 100, may be located inside the switchboard where the air circuit breaker 100 is located, the bus bar to which the air circuit breaker 100 is connected It may be located near 200.

The controller may control an operation of the thermoelectric module 300 by determining whether a temperature sensed through the temperature sensing unit exceeds a reference temperature.

Specifically, the controller may control the thermoelectric module 300 to not operate when the temperature sensed through the temperature sensing unit is less than or equal to the reference temperature, and when the temperature sensed through the temperature sensing unit is higher than the reference temperature, the thermoelectric unit By operating the module 300 to absorb surrounding heat through the thermoelectric module 300, the temperature sensed through the temperature sensing unit may be adjusted to be below the reference temperature.

In the present embodiment, a configuration in which the control unit operates the thermoelectric module 300 based on the temperature sensed through the temperature sensing unit is illustrated, but this is only an example and is not limited thereto.

For example, in addition to the temperature sensing unit, a configuration for sensing the magnitude of current may be provided, and the controller may be configured to operate the thermoelectric module 300 according to the magnitude of the current.

Meanwhile, FIG. 7 is an exploded perspective view illustrating a busbar and a thermoelectric module to which an air circuit breaker is connected according to a second embodiment of the present invention.

As shown in FIG. 7, a seating groove 210 may be formed in the bus bar 200 to which the air circuit breaker 100 is connected according to the second embodiment of the present invention, and it is fitted near the seating groove 210 A groove 230 may be formed.

In addition, a fitting part 330 may be formed at one end of the thermoelectric module 300.

Therefore, when the thermoelectric module 300 is seated in the seating groove 210, the fitting part 330 is inserted into the fitting groove 230, so that the thermoelectric module 300 is connected to the busbar 200. Can be connected to

Here, a handle part 340 may be further formed on the thermoelectric module 300.

The handle part 340 is formed on one surface of the thermoelectric module 300, and when a user attaches and attaches the thermoelectric module 300 to the busbar 200, the handle part 340 is held and the The thermoelectric module 300 may be attached to and detached from the bus bar 200.

Meanwhile, FIG. 8 is an exploded perspective view showing a busbar and a thermoelectric module to which an air breaker is connected according to a third embodiment of the present invention, and FIG. 9 is an exploded perspective view showing a busbar and a thermoelectric module to which an air breaker is connected according to a fourth embodiment of the present invention. It is an exploded perspective view, and FIG. 10 is an exploded perspective view showing a busbar and a thermoelectric module to which an air breaker is connected according to a fifth embodiment of the present invention.

As shown in Fig. 8, a seating groove 210 may be formed in the bus bar 200 to which the air circuit breaker 100 is connected according to the third embodiment of the present invention, and it is fitted near the seating groove 210 A groove 230 may be formed, and a locking groove 250 may be further formed in the fitting groove 230.

In addition, a fitting portion 330 may be provided at one end of the thermoelectric module 300, and a locking portion 350 may be formed at an upper end of the fitting portion 330.

Therefore, in a state in which the thermoelectric module 300 is seated in the seating groove 210, the fitting portion 330 is inserted into the fitting groove 230, and at the same time, the locking portion 350 is inserted into the locking groove 250 ), the thermoelectric module 300 may be connected to the busbar 200.

And, as shown in FIG. 9, a seating groove 210 may be formed in the bus bar 200 to which the air circuit breaker 100 according to the fourth embodiment of the present invention is connected, and near the seating groove 210 A protrusion groove 270 may be formed in the thermoelectric module 300, and protrusions 370 may be formed at both ends of the thermoelectric module 300.

In addition, as shown in FIG. 10, a seating groove 210 may be formed in the bus bar 200 to which the air circuit breaker 100 is connected according to the fifth embodiment of the present invention, and near the seating groove 210 Protrusions 290 may be formed in the thermoelectric module 300, and protrusion grooves 390 may be formed at both ends of the thermoelectric module 300.

Accordingly, in a state in which the thermoelectric module 300 is seated in the seating groove 210, the

protrusions

290 and 370 are fitted into the protruding

grooves

270 and 390, so that the thermoelectric module 300 It may be connected to the bar 200.

According to the present invention configured as described above, at least one thermoelectric module 300 is provided in the bus bar 200 of the switchboard to which the input terminal and the output terminal of the cradle 130 are connected, and the thermoelectric module 300 is used to lift the Since the circuit breaker 100 is cooled to prevent an excessive increase in temperature, an increase in the temperature of the air circuit breaker 100 is prevented without increasing the heat dissipation area of the air circuit breaker 100.

In addition, since it is not necessary to increase the heat dissipation area of the air circuit breaker 100, the temperature increase of the air circuit breaker 100 is prevented while satisfying the IEC standard.

In addition, the thermoelectric module 300 is operated using the driving power without installing a separate power source, thereby simplifying the overall structure of the temperature increase prevention device.

In addition, without installing a separate sensor, by operating the thermoelectric module 300 using current value information such as an overcurrent relay, it is possible to simplify the overall structure of the temperature rise prevention device.

Although a preferred embodiment of the present invention has been described above, it is clear that various changes, modifications, and equivalents can be used in the present invention, and the same can be applied by appropriately modifying the above embodiment. Therefore, the above description is not intended to limit the scope of the present invention determined by the limits of the following claims.

Claims

In the temperature rise prevention device for an air breaker connected to a bus bar of a switchboard to supply driving power to a load,

And at least one thermoelectric module provided on the bus bar to cool the breaker and heat generated from the bus bar.
The method of claim 1,

A temperature rise prevention device for an air circuit breaker, characterized in that a seating groove is formed in the bus bar so that the thermoelectric module is seated.
The method of claim 2,

A first fastening hole is formed near the edge of the thermoelectric module,

A second fastening hole is formed in the mounting groove to correspond to the first fastening hole,

The thermoelectric module is connected to the busbar by a fastening member being fastened through the first fastening hole and the second fastening hole.
The method of claim 2,

A fitting portion is formed at one end of the thermoelectric module,

In the vicinity of the seating groove of the busbar, a fitting groove is formed to fit the fitting portion.
The method of claim 2,

A locking part is formed at the upper end of the fitting part,

A temperature rise prevention device for an air circuit breaker, characterized in that a locking groove is formed in the vicinity of the fitting groove so that the locking part is inserted.
The method of claim 2,

Protrusions are formed at both ends of the thermoelectric module,

A temperature rise prevention device for an air circuit breaker, characterized in that a protrusion groove is formed in the vicinity of the seating groove to fit the protrusion.
The method of claim 2,

Protruding grooves are formed at both ends of the thermoelectric module,

A temperature rise prevention device for an air circuit breaker, characterized in that a protrusion is formed in the vicinity of the seating groove so as to be fitted into the protrusion groove.
The method according to any one of claims 1 to 7,

A temperature rise prevention device for an air circuit breaker, characterized in that a handle is formed on one surface of the thermoelectric module.
The method according to any one of claims 1 to 7,

The thermoelectric module is provided with a switching unit,

The thermoelectric module is operated by turning on or off the switching unit according to whether an overcurrent is applied to the busbar side.
The method according to any one of claims 1 to 7,

A temperature sensing unit for sensing the temperature of the circuit breaker,

And a control unit for controlling an operation of the thermoelectric module according to whether the temperature sensed through the temperature sensing unit exceeds a reference temperature.
The method of claim 9,

The temperature rise prevention device for an air circuit breaker, characterized in that the switching unit is made of a MOSFET.