DC voltage sensor having electromagnetic shielding structure

Abstract

The present invention relates to a DC voltage sensor having an electromagnetic shielding structure in which an electromagnetic shielding shield is installed on a conductor and a resistor so that voltage is prevented from being distributed to an external path even when the voltage is high, thus enabling precise voltage measurement. The present invention is characterized by comprising; a busbar; a high-voltage side resistor connected to the busbar; a low-voltage side resistor connected to the high-voltage side resistor; a central molding unit for sealing a central area of the busbar; a busbar molding unit which extends to the left and right from the central molding unit and seals the busbar; and a shield which is installed on at least one of the busbar, the high-voltage side resistor, or the low-voltage side resistor and performs the function of shielding from external electricity or magnetism.

Description

DC voltage sensor with electromagnetic shielding structure

[0001] The present invention relates to a DC voltage sensor having an electromagnetic shielding structure that enables precise voltage measurement by preventing voltage from being distributed to an external path even at high voltage by installing an electromagnetic shield on a conductor and a resistor.

[0002] In general, a voltage measurement sensor of the resistance-dividing type may include a conductor to which a voltage is applied and two resistance units electrically connected to the conductor, and measures the voltage generated across each resistance and measures the voltage as a ratio of the resistances. In addition, a housing is provided that is sealed with an insulator such as epoxy so as to be electrically insulated from the conductor and the resistance unit, and the exterior of the housing is configured in a protruding shape with alternating concave and convex portions.

[0003] However, in the case of a high-voltage measurement sensor that measures high voltage, there is a disadvantage in that it cannot measure the voltage accurately because the voltage is distributed at the part where the conductor to which the high voltage is applied and the primary resistance are connected.

[0004] Therefore, it is necessary to develop a technology to solve the problem of high voltage being distributed around the primary resistance in a voltage measurement sensor that measures high voltage using a resistance voltage division method.

[0005] The present invention has been devised to solve the problems of the prior art, and an object of the present invention is to provide a DC voltage sensor having an electromagnetic shielding structure that enables precise voltage measurement by preventing voltage from being distributed to an external path even at high voltage by installing an electromagnetic shield on a conductor and a resistor.

[0006] The problems to be solved by the present invention are not limited to those mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below.

[0007] In order to achieve the above object, a DC voltage sensor having an electromagnetic shielding structure according to the present invention is characterized by including: a busbar; a high-voltage side resistor connected to the busbar; a low-voltage side resistor connected to the high-voltage side resistor; a central molding part sealing a central area of ​​the busbar; a busbar molding part extending left and right from the central molding part and sealing the busbar; and a shield installed on at least one of the busbar, the high-voltage side resistor, and the low-voltage side resistor to perform a shielding function from external electricity or magnetism.

[0008] In addition, in the DC voltage sensor having an electromagnetic shielding structure according to the present invention, the shield is characterized by including a bushing shield installed on a busbar adjacent to the high-voltage side resistor to shield the busbar; and a high-voltage side resistance shield to shield the high-voltage side resistor.

[0009] In addition, in the DC voltage sensor having an electromagnetic shielding structure according to the present invention, a circuit unit casing is further included, which is installed on one side of a central molding portion and has a circuit unit mounted thereon; wherein the circuit unit casing is characterized by comprising a first casing attached to one side of the central molding portion; and a second casing detachably coupled to the first casing.

[0010] In addition, in the DC voltage sensor having an electromagnetic shielding structure according to the present invention, the high-voltage side resistor and the high-voltage side resistor shield are each sealed by the central molding portion together with the central region of the busbar, and the low-voltage side resistor is mounted within the circuit portion casing together with the circuit portion.

[0011] In addition, in the DC voltage sensor having an electromagnetic shielding structure according to the present invention, the bushing shield is characterized in that a pair is installed spaced apart on the left and right based on the high-voltage side resistance.

[0012] In addition, in the DC voltage sensor having an electromagnetic shielding structure according to the present invention, the bushing shield is characterized in that it is installed in a structure that extends to a portion of the left and right busbar molding parts based on the central molding part.

[0013] According to the DC voltage sensor having an electromagnetic shielding structure according to the present invention, by installing an electromagnetic shield on a conductor and a resistor, the voltage is not distributed to an external path even at high voltage, so that precise voltage measurement is possible.

[0014] The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below.

[0015] FIG. 1a is a diagram illustrating a first embodiment of a DC voltage sensor having an electromagnetic shielding structure according to the present invention, and is a transparent drawing to confirm the internal structure, and FIG. 1b is a longitudinal cross-sectional view of FIG. 1a.

[0016] FIG. 2 is a drawing corresponding to FIG. 1a, illustrating a second embodiment of a DC voltage sensor having an electromagnetic shielding structure according to the present invention.

[0017] Fig. 3 is a photograph of a mesh-shaped bushing shield according to the present invention.

[0018] FIG. 4 is a perspective view illustrating a third embodiment of a DC voltage sensor having an electromagnetic shielding structure according to the present invention, in which a circuit casing having a circuit portion and a low-voltage side resistor mounted on one side of a central molding portion is installed.

[0019] Fig. 5 is a perspective view showing the second casing separated from the circuit casing of Fig. 4.

[0020] Figure 6 is a cross-sectional view taken along line AA of Figure 4.

[0021] Figures 7a and 7b are drawings showing the structure of a conventional voltage sensor without a shield installed.

[0022] 100: Voltage sensor 101: Busbar

[0023] 103: High-pressure side resistance 105: Low-pressure side resistance

[0024] 107: Circuit section 108: Connector

[0025] 110: Central molding part 111: Busbar molding part

[0026] 120: Circuit casing 120a: First casing

[0027] 120b: Second casing 131: Bushing shield

[0028] 132: High-voltage resistance shield

[0029]

[0030] Hereinafter, a preferred embodiment of the present invention will be described in detail.

[0031] In describing the present invention, detailed descriptions of related known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the invention. Furthermore, the terms described below are defined based on their functions within the present invention and may vary depending on the intent of the user or operator, precedent, etc. Therefore, their definitions should be based on the overall content of this specification.

[0032] FIG. 1a is a perspective view showing a first embodiment of a DC voltage sensor having an electromagnetic shielding structure according to the present invention, and is a view to confirm the internal structure, FIG. 1b is a longitudinal cross-sectional view of FIG. 1a, FIG. 2 is a view corresponding to FIG. 1a, showing a second embodiment of a DC voltage sensor having an electromagnetic shielding structure according to the present invention, and FIG. 3 is a photograph of a mesh-shaped bushing shield according to the present invention.

[0033] Referring to FIGS. 1 to 3, a DC voltage sensor (100) having an electromagnetic shielding structure according to the present invention is a sensor using a resistance voltage division method, which connects two or more resistors (103, 105) to a high-voltage busbar (conductor) (101) and measures the voltage generated at each resistor to measure the high voltage as a ratio of the resistances.

[0034] However, in the case of high voltage exceeding 30 kV, accurate voltage measurement to the outside was not possible because the high voltage generated in the conductor was distributed or separated to an external path rather than the path leading to the resistor. However, the present invention is characterized by being configured to enable precise voltage measurement by installing a shield on the conductor and resistor.

[0035] More specifically, a DC voltage sensor (100) having an electromagnetic shielding structure according to the present invention may be configured to include a busbar (101), a high-voltage side resistor (103) connected to the busbar (101), a low-voltage side resistor (105) connected to the high-voltage side resistor (103), a central molding portion (110) sealing a central area of ​​the busbar (101), a busbar molding portion (111) extending left and right from the central molding portion (110) and sealing the busbar (101), and a shield (131, 132) installed on at least one of the busbar (101), the high-voltage side resistor (103), and the low-voltage side resistor (105) to perform a shielding function from external electricity or magnetism.

[0036] The above shield (131, 132) is installed on the busbar (101) adjacent to the high-voltage side resistor (103) and includes a bushing shield (131) that shields the busbar (101) and a high-voltage side resistor shield (132) that shields the high-voltage side resistor (103), thereby eliminating or minimizing the influence of the high voltage on the primary side.

[0037] Here, the above-mentioned bushing shield (131) and the high-pressure side resistance shield (132) may be made of a metal material, for example, aluminum or copper, and it is preferable that they be made of a mesh structure as shown in Fig. 3 so that the busbar and resistance can be sealed together with the shield during epoxy molding.

[0038] Accordingly, the high-voltage side resistor (103) and the high-voltage side resistor shield (132) are each sealed by the central molding portion (110) together with the central area of ​​the busbar (101).

[0039] The above bushing shield (131) may be installed in pairs spaced apart to the left and right based on the high-pressure side resistor (103) as shown in FIG. 1a, or may be installed in a structure that extends to a portion of the left and right busbar molding parts (111) based on the central molding part (110) as shown in FIG. 2.

[0040] Meanwhile, FIG. 4 is a perspective view showing a third embodiment of a DC voltage sensor having an electromagnetic shielding structure according to the present invention, in which a circuit part casing having a circuit part and a low-voltage side resistor mounted on one side of a central molding part is installed, FIG. 5 is a perspective view showing a second casing separated from the circuit part casing of FIG. 4, and FIG. 6 is a cross-sectional view taken along line AA of FIG. 4.

[0041] Referring to FIGS. 4 to 6, the present embodiment is characterized in that a circuit casing (120) having a low-voltage side resistor (105) mounted on one side of a central molding portion (110) is installed.

[0042] The circuit casing (120) is installed on one side of the central molding part (110) and serves to mount the circuit part (107) and the low-voltage side resistor (105) therein. It may be composed of a first casing (120a) attached to one side of the central molding part (110) and a second casing (120b) detachably coupled to the first casing (120a).

[0043] In the case of this embodiment, unlike the previously described embodiment, the low-pressure side (secondary side) resistor (105) is housed in a circuit casing installed separately from the molding part and has a structure in which it is connected to the high-pressure side resistor through a connector (108), so that the capacity of the low-pressure side resistor can be changed and the secondary output value can be changed by adjusting the pressure division ratio.

[0044] The present invention described above is merely exemplary, and those skilled in the art will readily appreciate that various modifications and equivalent other embodiments are possible. Therefore, it will be readily understood that the present invention is not limited to the forms mentioned in the detailed description above. Accordingly, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims. Furthermore, the present invention should be understood to include all modifications, equivalents, and alternatives within the spirit and scope of the present invention as defined by the appended claims.

[0045] By installing an electromagnetic shield on the conductor and resistor, it can be used as a DC voltage sensor with an electromagnetic shielding structure that enables precise voltage measurement because the voltage is not distributed to an external path even at high voltage.

Claims

1. Boothba; A high-voltage resistance connected to the above busbar; A low-pressure side resistor connected to the above high-pressure side resistor; A central molding portion sealing the central area of ​​the above busbar; A busbar molding part extending left and right from the central molding part and sealing the busbar; A shield installed on at least one of the above busbar, the high-voltage side resistor, and the low-voltage side resistor to perform a shielding function from external electricity or magnetism; A DC voltage sensor having an electromagnetic shielding structure characterized by including a .

2. In paragraph 1, The above shield, A bushing shield installed on a busbar adjacent to the high-pressure side resistor to shield the busbar; A DC voltage sensor having an electromagnetic shielding structure, characterized by including a high-voltage-side resistance shield that shields the high-voltage-side resistance.

3. In paragraph 2, It further includes a circuit part casing installed on one side of the central molding part and mounting the circuit part; The above circuit casing is, A first casing attached to one side of the central molding portion; A DC voltage sensor having an electromagnetic shielding structure, characterized by comprising: a second casing detachably coupled to the first casing; 4. In paragraph 3, The above high-voltage side resistor and the high-voltage side resistor shield are each sealed by the central molding part together with the central area of ​​the busbar, A DC voltage sensor having an electromagnetic shielding structure, characterized in that the low-pressure side resistor is mounted within the circuit unit casing together with the circuit unit.

5. In paragraph 4, The above bushing shield, A DC voltage sensor having an electromagnetic shielding structure, characterized in that a pair is installed spaced apart on the left and right based on the high-pressure side resistance.

6. In paragraph 5, The above bushing shield, A DC voltage sensor having an electromagnetic shielding structure, characterized in that it is installed in a structure that extends to a portion of the left and right busbar molding parts based on the central molding part.

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