KR102468574B1 - Watt-hore meter - Google Patents

Abstract

The present invention relates to a large-capacity watt-hour meter, capable of reducing heat generation, which comprises: a main body housing (110) of an enclosure structure; an insulating terminal block (120); a plurality of terminal units (130, 140); a bar type busbar (150) accommodated in a busbar accommodating unit (103); a tightening fixing unit (160); an annular current transformer (170); and a measurement module (200).

Description

Large-capacity watt-hour meter {Watt-hore meter}

The present invention relates to an watt-hour meter suitable for a large capacity capable of improving the contact of terminal parts and reducing heat generation.

In general, a watt-hour meter is a gauge installed to visually check the power used in a factory or home. The watt-hour meter is connected in series with a power line to measure the voltage and current of the power line and directly indicate the measurement result. It is mainly digital or electronic. It is being used.

Inside the watt-hour meter, the current terminal block of the input terminal and the output terminal block of the output terminal are connected with internal wiring for each current phase, and a current transformer (CT) is provided in the internal wiring. The secondary current output value measured from the current transformer and the voltage value measured from the terminal block are added and calculated by the CPU of the electronic watt-hour meter to measure the value of the amount of power used on the load side.

On the other hand, two watt-hour meters, a single-type watt-hour meter and a transformer (CT) part meter, are used in general. The capacities of stand-alone watt-hour meters used in KEPCO are 40A and 100A, and transformer-type watt-hour meters have a secondary current of 5A and a primary current of 150A, 200A, 250A, 300A, 400A, 500A, or up to 1000A. Generally, based on 100kW, it is divided into low-pressure and high-pressure consumers, and as the power consumption of consumers increases, the demand for large-capacity watt-hour meters is also increasing. On the other hand, as the capacity of the watt-hour meter increases, a lot of heat may be generated due to a decrease in the contactability of the terminal part, etc., and it is necessary to effectively eliminate the heat generation problem in the terminal part.

Registered Utility Model Publication No. 20-0378510 (Announcement date: 2005.03.11.)) Registered Patent Publication No. 10-1030727 (Public date: 2011.04.26.)

The present invention is to solve the problems of the prior art, and to provide an watt-hour meter suitable for large capacity that can improve the contact of the terminal part and reduce the heating problem.

An watt-hour meter according to an embodiment of the present invention for achieving this object includes a main body housing having a housing structure in which a busbar accommodating part is formed and partitioned by a partition protruding from the installation bottom surface; an insulating terminal block provided adjacent to the busbar accommodating portion at a lower end of the main body housing; a plurality of terminal units inserted into the insulated terminal block by fixing each of the power line and the load line; a rectangular bar-type busbar accommodated in the busbar accommodating portion and having two ends inserted into the insulating terminal block to connect the power side and the load side of the terminal unit to each other; a fastening fixing part screwed to the insulated terminal block to fix the terminal part, the bus bar, and the front end; an annular current transformer inserted into the busbar to detect an amount of current; A measuring module installed in the main body housing to output a measured power amount by calculating and processing a detection signal of the annular current transformer, wherein the terminal unit includes a cylindrical wire fixing piece into which a wire is inserted and fixed, and the wire fixing piece. It includes a hollow terminal fixing piece extending integrally from and having a square cross section, and a heat dissipation member provided in the hollow portion of the terminal fixing piece.

Preferably, the terminal fixing piece has protrusions protruding from the surface.

Preferably, in the body housing, a heat-insulating paint is applied to the bottom surface of the busbar accommodating part and the barrier rib, and a heat-dissipating paint is applied to the busbar.

Preferably, the fastening fixing unit includes a fixing bracket provided with a gap in the insulation terminal block by inserting the terminal unit and the front end of the bus bar; A tightening bolt is screwed into the fixing bracket and manipulates the fixing bracket in a clearance direction to generate a contact force between the terminal unit and the bus bar.

Preferably, the bypass module further includes a terminal insertion hole adjacent to the insulating terminal block and corresponding to the terminal unit into which each terminal unit is inserted, and a connection hole vertically communicating with the terminal insertion hole.

More preferably, the bypass module further includes an insulating module having an insulating barrier rib for partitioning terminal parts inserted into the terminal insertion hole from each other.

The watt-hour meter of the present invention includes a main body housing having an enclosure structure in which a busbar accommodating part is formed, an insulating terminal block provided at the lower end of the main body housing, a plurality of terminal parts inserted into the insulating terminal block by fixing power lines and load lines, respectively; A rectangular bar-type busbar accommodated in the busbar accommodating portion and having two ends inserted into the insulating terminal block to connect the power side and the load side of the terminal unit to each other, and screwed into the insulation terminal block to connect the terminal unit and the It includes a tightening fixing part for fixing the front end of the bus bar, and the terminal part has a cylindrical wire fixing piece into which a wire is inserted and fixed, and a hollow shape having a rectangular cross section integrally extended from the wire fixing piece. There is an effect of increasing the contact between the busbar and the terminal part and reducing heat generation by including the terminal fixing piece of the terminal and the heat dissipation member provided in the hollow portion of the terminal fixing piece.

1 is a perspective configuration diagram of an watt-hour meter according to an embodiment of the present invention.
2 is a front configuration diagram of an watt-hour meter according to an embodiment of the present invention.
3 is an exploded perspective configuration diagram of an watt-hour meter according to an embodiment of the present invention.
FIG. 4 is a cross-sectional configuration diagram taken along line AA of FIG. 2 .
(a) and (b) of FIG. 5 are perspective views of terminals of the watt-hour meter and cross-sectional views of lines BB, respectively, according to an embodiment of the present invention.
6 is a plan configuration diagram showing only a terminal part, a bus bar, and a fastening part of an watt-hour meter according to an embodiment of the present invention.
Figure 7 (a) (b) is a cross-sectional configuration diagram of the line CC of Figure 6, respectively, is a view for explaining the fixing operation of the fastening fixture.
8 is a perspective configuration diagram of an watt-hour meter according to another embodiment of the present invention.

Specific structural or functional descriptions presented in the embodiments of the present invention are merely exemplified for the purpose of explaining embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms. In addition, it should not be construed as being limited to the embodiments described in this specification, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and scope of the present invention.

On the other hand, in the present invention, when a component is referred to as being "connected" or "connected" to another component, it may be directly connected or connected to the other component, but another component in the middle It should be understood that it may exist. On the other hand, when an element is referred to as “directly connected” or “directly in contact” with another element, it should be understood that no other element exists in the middle. Other expressions used to describe the relationship between elements, such as "between" and "directly between" or "adjacent to" and "directly adjacent to" should be interpreted similarly.

Terms used in this specification are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "comprise" or "having" are intended to indicate that there is an embodied feature, number, step, operation, component, part, or combination thereof, but one or more other features or numbers, It should be understood that the presence or addition of steps, operations, components, parts, or combinations thereof is not precluded.

Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a perspective configuration diagram of an watt-hour meter according to an embodiment of the present invention, FIG. 2 is a front configuration diagram of the watt-hour meter according to an embodiment of the present invention, and FIG. 3 is an exploded perspective configuration diagram of the watt-hour meter according to an embodiment of the present invention. 4 is a cross-sectional configuration diagram taken along line A-A of FIG. 2 .

1 to 4, the watt-hour meter of this embodiment includes a body housing 100, an insulated terminal block 120, terminal units 130 and 140, a bus bar 150, a fastening unit 160, and an annular shape. A current transformer 170 and a measurement module 200 are included.

The body housing 100 is an enclosure structure as a whole, and the cover assembled on the front surface of the body housing is omitted in the drawings of this embodiment. The main body housing 100 includes an installation floor 101 on which main components are installed on the floor, and a bus bar 150 and a measurement module 200 are fixed to the top of the installation floor 101.

Specifically, as shown in FIG. 4, a plurality of partition walls 102 protruding from the installation bottom surface 101 are provided, and partitioned by the partition walls 102 to accommodate busbars 150 are accommodated. A portion 103 is provided, preferably, a heat-insulating paint 104 is applied to the bottom surface 101 and the partition wall 102 around which the busbar receiving portion 103 is formed, more preferably, the booth The bar 150 is coated with a heat dissipating paint 151. In a large-capacity watt-hour meter, a high current flows through the busbar, resulting in considerable heat, and therefore, the body housing around the busbar is exposed to high temperatures for a long time, causing deformation or damage. The heat insulating paint 104 applied to the installation bottom surface 101 and the partition wall 102 of the busbar accommodating part 103 is directly transferred to the body housing 110 by the high-temperature heat generated from the busbar 150. can block On the other hand, the heat-dissipating paint 151 applied to the busbar 150 can effectively manage the heat generated from the busbar 150, and preferably, only on the upper exposed surface and part of the side of the busbar 150. The heat dissipation paint 151 may be applied to induce heat dissipation only in an open direction. A carbon material such as graphene having excellent thermal conductivity may be used as the heat dissipating paint. Preferably, the distance D2 between the busbar 150 and the installation floor 101 is greater than the distance D1 between the busbar 150 and the partition wall 102 within the busbar accommodating part 103 (D1 < D2) A sufficient distance between the busbar 150 and the installation floor 101 is secured to minimize thermal damage to the body housing 110 caused by the busbar 150.

Referring back to FIGS. 1 to 3, the insulation terminal block 120 is adjacent to and fixed to the busbar receiving portion 103 at the bottom of the body housing 110, and each terminal portion 130, 140 and the busbar ( 150) is insulated from each other at the lower and upper portions of the insulating terminal block 120, fitted and assembled, and fixed by each fastening fixing part 160. The tightening fixing part 160 is composed of a tightening bolt 161 and a fixing bracket 162 . In order to help the understanding of the invention, in FIG. 3, the fixing bracket 162 is illustrated as being inserted at the bottom of the bus bar 150, but in fact, the fixing bracket 162 is provided in the insulated terminal block 120. The fixing bracket 162 The fastening bolt 161 is screwed into the screw hole 162a of ), and the fixing bracket 162 moves in the forward and backward directions (x-axis direction) within the insulating terminal block 120 by the operation of the fastening bolt 161. to fix the terminal units 130 and 140 and the bus bar 150. This will be described in detail later with reference to related drawings. In this embodiment, although two tightening bolts 161 are exemplified, the number may be increased or decreased. Preferably, the tightening bolt 161 is provided by a hexagon wrench bolt.

The terminal parts 130 and 140 are composed of a power-side terminal part 130 and a load-side terminal part 140. The power-side terminal part 130 is fixed to the power line 10 and the load-side terminal part 140 is fixed to the load line 20. do. The power-side terminal part and the load-side terminal part have substantially the same configuration.

Figure 5 (a) (b) is a perspective view of the terminal portion of the watt-hour meter according to an embodiment of the present invention and a cross-sectional view of line B-B, respectively.

The terminal unit 130 includes a cylindrical wire fixing piece 131 into which a wire is inserted and fixed, a hollow terminal fixing piece 132 integrally extending from the wire fixing piece 131 and having a square cross section, and a terminal A heat dissipation member 133 provided in the hollow part 132a of the fixing part 132 is included.

The wire fixing piece 131 is fixed with the wire by pressing the wire fixing piece 131 after an open hole 131a is formed and the wire is inserted into the hole 131a.

The terminal fixing piece 132 has an outer circumferential surface of a rectangular pillar as a whole, and preferably, protrusions 132a are protruded from the contact surface contacting the busbar to increase contact between the terminal unit and the busbar.

The terminal fixing piece 132 has a hollow part 132a formed in the center, and a heat dissipation member 133 having excellent thermal conductivity is provided in the vertical part 132a. The heat dissipation member 133 may be provided by carbon powder or carbon rods such as graphene.

Referring back to FIGS. 1 to 3, the bus bar 150 is a prismatic bar type, has an approximate 'c' shape, and each tip is connected to the power side terminal unit 130 and the load side terminal unit 140 and electrically connects the two terminal units 130 and 140.

The tightening fixing part 160 is composed of a tightening bolt 161 and a fixing bracket 162, and the fixing bracket 162 is provided to have a small gap in the insulating terminal block 120 to loosen or tighten the tightening bolt 161. As a result, the fixing bracket 162 moves in the clearance direction (x-axis direction) and generates a contact force between the terminal parts 130 and 140 and the bus bar 150 to be fixed.

6 is a plan configuration diagram showing only the terminal portion, the busbar, and the tightening fixing portion of the watt-hour meter according to an embodiment of the present invention, and FIG. 7 (a) (b) is a cross-sectional view of the line C-C in FIG. It is a diagram for explaining the fixed operation of the government.

Specifically, referring to (a) of FIG. 7, the fixing bracket 162 is a rectangular shell-shaped conductor opened vertically (in the z-axis direction), and the tightening bolt 161 is screwable. A screw hole 162a is formed and provided in the insulating terminal block 120 . The fixing bracket 162 can move forward and backward with a certain gap in the forward and backward directions (x-axis direction) within the insulating terminal block 120 . On the other hand, the terminal unit 140 and the bus bar 150 are fitted and assembled in the vertical direction (z-axis direction) at the bottom and top of the insulation terminal block 120, respectively, and movement is restricted in the front-back direction (x-axis direction). do. In a state in which the terminal unit 140 and the bus bar 150 are temporarily assembled with the insulating terminal block 120, each tip of the terminal unit 140 and the bus bar 150 is inserted into the fixing bracket 162.

As shown in (b) of FIG. 7, when the tightening bolt 161 is tightened, the fixing bracket 162 moves to the left (x-axis direction) within the insulation terminal block 120 and connects the terminal unit 140 and the booth. By pressurizing and fixing the bar 150, the terminal unit 140 and the bus bar 150 are firmly fixed.

Referring back to FIGS. 1 to 3 , the annular current transformer 170 is inserted into the busbar 150 to detect the amount of current. In this embodiment, one annular current transformer 170 is provided in each busbar 150. However, since two annular current transformers are provided on each bus bar 150, measurement errors can be reduced by distinguishing low current from large current.

The measuring module 200 is installed in the body housing 100 and calculates the measured power amount using the measured voltage together with the detection signal of the toroidal current transformer 170 and performs a function of outputting it.

Preferably, a bypass module 180 for non-interruptible replacement of a watt-hour meter may be added to the lower end of the insulating terminal block 120. The bypass module 180 corresponds to each terminal part 130, 140 and connects to a terminal insertion hole 181 into which each terminal part 130, 140 is inserted, and is in vertical communication with each terminal insertion hole 181. A hole 182 is formed. The bypass module 180 is assembled with a terminal block for uninterruptible replacement so that an uninterruptible replacement of the watt-hour meter is possible.

8 is a perspective configuration diagram of an watt-hour meter according to another embodiment of the present invention.

Referring to FIG. 8 , the watt-hour meter of this embodiment further includes an insulation module 190 having an insulation barrier rib 191 for partitioning the terminal units 130 and 140 inserted into the terminal insertion hole of the bypass module 180 from each other. include

The insulation module 190 may have guide grooves 192 formed at both ends thereof and may be fitted and assembled to the fixing protrusions 183 of the bypass module 180 to be fixed to the bypass module 180 .

Such an insulation module 190 can prevent an accident in advance by surely spatially separating the terminal units 130 and 140 at the time of uninterruptible replacement of the watt-hour meter.

Reference numeral 30 shows an uninterruptible replacement terminal block, and a bypass wire 31 for electrically connecting the power-side terminal unit 130 and the load-side terminal unit 140 is provided inside the uninterruptible replacement terminal unit.

The present invention described above is not limited by the foregoing embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible within a range that does not deviate from the technical spirit of the present invention. will be clear to those who have knowledge of

110: body housing 120: insulated terminal block
130: power side terminal part 131: wire fixing piece
132: terminal fixing piece 133: heat dissipation member
140: load side terminal part 150: bus bar
160: fastening fixture 170: annular current transformer
180: bypass module 190: isolation module
200: measurement module

Claims (6)

A main body housing having a housing structure in which a busbar accommodating portion is formed and partitioned by a partition wall protruding from the installation bottom surface;
an insulating terminal block provided adjacent to the busbar accommodating portion at a lower end of the main body housing;
a plurality of terminal units inserted into the insulated terminal block by fixing each of the power line and the load line;
a rectangular bar-type busbar accommodated in the busbar accommodating portion and having two ends inserted into the insulating terminal block to connect the power side and the load side of the terminal unit to each other;
a fastening fixing part screwed to the insulated terminal block to fix the terminal part, the bus bar, and the front end;
an annular current transformer inserted into the busbar to detect an amount of current;
A measurement module installed in the main body housing to output the measured power amount by calculating and processing the detection signal of the toroidal current transformer;
The terminal part,
A cylindrical wire fixture into which a wire is inserted and crimped and fixed, and a hollow terminal integrally extending in the longitudinal direction from the wire fixture and having a square cross section and making surface contact with the busbar by the clamping fixture. A fixing piece and a carbon powder or carbon rod provided in the hollow portion of the terminal fixing piece,
The main body housing is an watt-hour meter, characterized in that a heat-insulating paint is applied to the bottom surface of the busbar accommodating part and the bulkhead, and a heat-dissipating paint is applied to the busbar. The watt-hour meter according to claim 1, wherein a protrusion is formed on a surface of the terminal fixing piece. delete The method of claim 1, wherein the fastening unit,
a fixing bracket in which the terminal unit and the front end of the bus bar are inserted to have a gap in the insulation terminal block;
A power meter including a tightening bolt screwed to the fixing bracket and operating the fixing bracket in a clearance direction to generate a contact force between the terminal unit and the busbar. The watt-hour meter of claim 1, further comprising a bypass module having terminal insertion holes adjacent to the insulation terminal block and corresponding to the terminal units into which terminal units are inserted, and connection holes vertically communicating with the terminal insertion holes. The watt-hour meter of claim 5, wherein the bypass module further comprises an insulating module having an insulating barrier rib for partitioning terminal parts inserted into the terminal insertion hole from each other.

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