阅读说明：本技术 高压交流计量装置 (High-voltage alternating current metering device ) 是由 李中泽 杨飞 王伟 于 2020-06-17 设计创作，主要内容包括：本申请提供一种高压交流计量装置,涉及电气装置技术领域。高压交流计量装置包括基础壳体、分压单元、信号处理模块和电流互感器,分压单元设置于基础壳体内且被绝缘材料裹覆,分压单元与信号处理模块电连接,信号处理模块与电流互感器电连接,基础壳体上设有第一接线端子、第二接线端子。分压单元包括第一屏蔽单元、计量分压单元和第二屏蔽单元。计量分压单元包括横向排布的第一电阻器,第一电阻器的中心线到第一屏蔽单元、第二屏蔽单元的间距相等且与第一屏蔽单元、第二屏蔽单元平行。高压交流计量装置能够对电流线进行监测计量,其分压单元实现了非闭环式的等电位屏蔽,使得计量精度有保障,产品可靠性高又节省材料。(The application provides a high voltage alternating current metering device, and relates to the technical field of electrical devices. The high-voltage alternating-current metering device comprises a basic shell, a voltage dividing unit, a signal processing module and a current transformer, wherein the voltage dividing unit is arranged in the basic shell and is wrapped by an insulating material, the voltage dividing unit is electrically connected with the signal processing module, the signal processing module is electrically connected with the current transformer, and a first wiring terminal and a second wiring terminal are arranged on the basic shell. The voltage dividing unit comprises a first shielding unit, a metering voltage dividing unit and a second shielding unit. The metering voltage-dividing unit comprises first resistors which are transversely arranged, and the distance from the center line of each first resistor to the first shielding unit and the distance from the center line of each first resistor to the second shielding unit are equal and are parallel to the first shielding unit and the second shielding unit. The high-voltage alternating current metering device can monitor and meter a current line, and the voltage division unit of the high-voltage alternating current metering device realizes non-closed-loop equipotential shielding, so that the metering precision is guaranteed, the product reliability is high, and materials are saved.)

1. A high voltage ac metering device, comprising: the current transformer comprises a basic shell, a voltage division unit, a signal processing module and a current transformer, wherein an insulating material is filled in the basic shell, the voltage division unit is arranged in the basic shell and is wrapped by the insulating material, the voltage division unit is electrically connected with the signal processing module, the signal processing module is electrically connected with the current transformer, a measured current wire penetrates through the current transformer, a first wiring terminal and a second wiring terminal are arranged on the basic shell, and the first wiring terminal is respectively connected with the signal processing module and the voltage division unit;

the voltage dividing unit comprises a supporting and connecting unit, and a power supply high-voltage arm unit, a first shielding unit, a metering voltage dividing unit and a second shielding unit which are arranged on the supporting and connecting unit, wherein the first shielding unit and the second shielding unit are respectively positioned on two opposite sides of the metering voltage dividing unit and are electrically connected with the power supply high-voltage arm unit;

the metering voltage-dividing unit comprises first resistors which are transversely and uniformly arranged, the distance from the center line of each first resistor to the first shielding unit and the distance from the center line of each second resistor to the second shielding unit are equal, and the axial center line of each first resistor is parallel to the center line of the shielding section of the corresponding first shielding unit and the center line of the shielding section of the corresponding second shielding unit.

2. The high-voltage alternating current metering device of claim 1, wherein the power supply high-voltage arm unit and the metering voltage dividing unit are used for equally dividing a high voltage into a plurality of low voltages;

the first shielding unit and the second shielding unit comprise a plurality of shielding sections, the shielding sections are respectively connected with the power supply high-voltage arm unit through the supporting and connecting unit, and each partial voltage of the metering and voltage dividing unit is shielded by every two opposite shielding sections in an equipotential mode.

3. The high-voltage alternating current metering device according to claim 2, wherein the shielding unit comprises a first substrate, a plurality of first welding bosses and copper foil blocks, the first substrate is provided with a plurality of first welding bosses at intervals, each first welding boss corresponds to one shielding section, each shielding section is provided with two copper foil blocks and is electrically connected with the corresponding first welding boss, and the two copper foil blocks are oppositely arranged on two sides of the first substrate and are communicated through metal through holes.

4. The high-voltage alternating current metering device of claim 1, wherein the metering voltage division unit comprises a second substrate, second welding bosses, a first low-voltage terminal, a first high-voltage terminal and an output terminal, and the second welding bosses are distributed at intervals along one side edge in the length direction of the second substrate; the plurality of first resistors are sequentially connected in series to form a resistor string and are arranged on the second substrate in an S shape, the first resistor at the starting end of the resistor string is a first end resistor, the first resistor at the ending end of the resistor string is a tail end resistor, the first resistor of the resistor string, which is directly connected in series with the first end resistor, is a second end resistor, the first connecting terminal is connected with the first end resistor through the first low-voltage terminal, the second connecting terminal is connected with the tail end resistor through the first high-voltage terminal, the output terminal is arranged at the joint of the first end resistor and the second end resistor and is electrically connected with the signal processing module, the first end resistor is a low-voltage arm of the metering voltage division unit, and the first resistors between the output terminal and the first high-voltage terminal are connected in series to form a high-voltage arm of the metering voltage division unit;

the first resistor is a metal film precision resistor with the same parameters.

5. The high-voltage alternating current metering device according to claim 4, wherein copper foil blocks are respectively arranged on the front and back surfaces of the portion, located at the connecting position of the two directly connected first resistors, of the second substrate and are communicated through metal through holes.

6. The AC high voltage metering device of claim 5, wherein said second substrate is fabricated by direct corrosion processing of a double-sided copper-clad printed circuit board.

7. The high voltage ac metering device of claim 2, wherein said power source high voltage arm unit comprises a third substrate, a second resistor, a voltage dividing capacitor, a second low voltage terminal, a second high voltage terminal, and a third weld boss;

it is a plurality of the second resistor and a plurality of voltage dividing capacitor staggers in proper order and establishes ties into resistance-capacitance cluster and be the S-shaped distribution in the third base plate, the second low voltage terminal the second high voltage terminal respectively with be located resistance-capacitance cluster start end and end the second resistor is connected, the second low voltage terminal with signal processing module connects, the second high voltage terminal with second binding post connects, and is a plurality of the third welding boss is along one side border interval distribution of the length direction of third base plate, every two is relative the shielding section passes through the third welding boss with correspond the second resistor and voltage dividing capacitor electricity is connected.

8. The high-voltage alternating current metering device of claim 1, wherein the supporting and connecting unit comprises a fourth substrate, pads and connecting lines, the fourth substrate is provided with a plurality of rows of connecting holes in the length direction, a corresponding pad is arranged near each connecting hole, a plurality of pads in the same column are electrically connected through the connecting lines, and the power supply high-voltage arm unit, the first shielding unit, the metering voltage-dividing unit and the second shielding unit are connected to the fourth substrate at the connecting holes.

9. The high voltage ac metering device of claim 8, wherein the fourth substrate comprises four rows of the connection holes from top to bottom;

the first line of the connecting holes are used for being plugged with the power supply high-voltage arm unit and the second line of the connecting holes are used for being plugged with the first shielding unit and the third line of the connecting holes are used for being plugged with the metering voltage division unit and the fourth line of the connecting holes are used for being plugged with the second shielding unit.

10. The high voltage ac metering device of claim 1, wherein the base housing comprises an epoxy insulated pipe, a first flange, a second flange, and a transformer housing;

the voltage dividing unit is arranged in the epoxy insulating pipe, silicon rubber is filled in the epoxy insulating pipe, one end of the first flange is connected with one end of the epoxy insulating pipe, the other end of the first flange is connected with the transformer shell, the first wiring terminal is arranged on the first flange, the signal processing module is contained in the first flange, the current transformer is arranged in the transformer shell, the second flange is connected to the other end of the epoxy insulating pipe, the second wiring terminal is arranged on the second flange, and a silicon rubber umbrella skirt is arranged on the periphery of the epoxy insulating pipe.

Technical Field

The application relates to the technical field of electrical devices, in particular to a high-voltage alternating-current metering device.

Background

The high-voltage power line is required to be monitored in power and measured in electric energy, and a high-voltage electric energy measuring device is generally adopted to work correspondingly in the prior art.

However, the high-voltage electric energy metering device still has some disadvantages, for example, the used metering resistor has larger pressure difference with the shielding layer and high electric field, and cannot well realize insulation and equipotential shielding; the high-voltage divider resistor and the low-voltage divider resistor are not the same resistor and are not in the same environment, so when the environment changes, the changes of the high-voltage divider unit and the low-voltage divider unit are not consistent, and the metering accuracy is not high.

Disclosure of Invention

An object of the present application is to provide a high voltage ac metering device that can solve the above problems.

The embodiment of the application is realized as follows:

an embodiment of the present application provides a high voltage alternating current metering device, includes: the current transformer comprises a basic shell, a voltage division unit, a signal processing module and a current transformer, wherein an insulating material is filled in the basic shell, the voltage division unit is arranged in the basic shell and is wrapped by the insulating material, the voltage division unit is electrically connected with the signal processing module, the signal processing module is electrically connected with the current transformer, a measured current wire penetrates through the current transformer, a first wiring terminal and a second wiring terminal are arranged on the basic shell, and the first wiring terminal is respectively connected with the signal processing module and the voltage division unit;

the voltage dividing unit comprises a supporting and connecting unit, and a power supply high-voltage arm unit, a first shielding unit, a metering voltage dividing unit and a second shielding unit which are arranged on the supporting and connecting unit, wherein the first shielding unit and the second shielding unit are respectively positioned on two opposite sides of the metering voltage dividing unit and are electrically connected with the power supply high-voltage arm unit;

the metering voltage-dividing unit comprises first resistors which are transversely and uniformly arranged, the distance from the center line of each first resistor to the first shielding unit and the distance from the center line of each second resistor to the second shielding unit are equal, and the axial center line of each first resistor is parallel to the center line of the shielding section of the corresponding first shielding unit and the center line of the shielding section of the corresponding second shielding unit.

The utility model provides a high-voltage alternating-current metering device is through with first shielding unit, the equidistant parallel arrangement of first resistor on second shielding unit and the measurement voltage division unit, first shielding unit, the second shielding unit respectively with power high-voltage arm unit electrical connection, measurement voltage division unit resistance evenly distributed, equipotential shielding has been realized, and because first resistor transversely lays, the projection at the resistor axial is a single-point, when consequently receiving the interference from the electric field that is on a parallel with first resistor center pin direction, there is not the inconsistent phenomenon of horizontal leakage current, need not to set up closed shielding structure at first resistor center pin vertical direction.

In addition, the high-voltage alternating-current metering device provided by the embodiment of the application can also have the following additional technical characteristics:

in an optional embodiment of the present application, the power supply high voltage arm unit and the metering voltage dividing unit are configured to equally divide a high voltage into a plurality of low voltages;

the first shielding unit and the second shielding unit comprise a plurality of shielding sections, the shielding sections are respectively connected with the power supply high-voltage arm unit through the supporting and connecting unit, and each partial voltage of the metering and voltage dividing unit is shielded by every two opposite shielding sections in an equipotential mode.

In the optional embodiment of this application, the shielding unit includes first base plate, first welding boss and copper foil piece, a plurality of first welding bosses of having arranged at the interval on the first base plate, every first welding boss corresponds one the shielding section, every the shielding section is equipped with two the copper foil piece just is connected with the first welding boss electricity that corresponds, two the copper foil piece set up relatively in the both sides of first base plate just pass through the metal via hole intercommunication.

In an optional embodiment of the present application, the metering voltage dividing unit includes a second substrate, a second welding boss, a first low voltage terminal, a first high voltage terminal, and an output terminal, and a plurality of the second welding bosses are distributed at intervals along one side edge in a length direction of the second substrate; the plurality of first resistors are sequentially connected in series to form a resistor string and are arranged on the second substrate in an S shape, the first resistor at the starting end of the resistor string is a first end resistor, the first resistor at the ending end of the resistor string is a tail end resistor, the first resistor of the resistor string, which is directly connected in series with the first end resistor, is a second end resistor, the first connecting terminal is connected with the first end resistor through the first low-voltage terminal, the second connecting terminal is connected with the tail end resistor through the first high-voltage terminal, the output terminal is arranged at the joint of the first end resistor and the second end resistor and is electrically connected with the signal processing module, the first end resistor is a low-voltage arm of the metering voltage division unit, and the first resistors between the output terminal and the first high-voltage terminal are connected in series to form a high-voltage arm of the metering voltage division unit;

the first resistor is a metal film precision resistor with the same parameters.

The metal film precision resistors with the same parameters are in the same environment, the temperature coefficients of the high-voltage arm and the low-voltage arm are guaranteed to be the same, the problem that the high-voltage arm and the low-voltage arm are affected by the environment and deviate inconsistently is solved, and the metering precision is improved.

In an optional embodiment of the present application, copper foil blocks are respectively disposed on the front and back sides of the portion of the second substrate located at the connection of the two directly connected first resistors and are communicated through metal vias.

The setting of copper foil piece can increase resistance and surrounding environment's area of contact, metal via hole can lead to the tow sides with the heat biography fast, promotes the radiating effect.

In an alternative embodiment of the present application, the second substrate is fabricated by direct etching of a double-sided copper-clad printed circuit board.

Therefore, the achievement transformation from the technology to the product can be better realized, the manufacturability is good, and the cost is low.

In an alternative embodiment of the present application, the power supply high voltage arm unit includes a third substrate, a second resistor, a voltage dividing capacitor, a second low voltage terminal, a second high voltage terminal, and a third welding boss;

it is a plurality of the second resistor and a plurality of voltage dividing capacitor staggers in proper order and establishes ties into resistance-capacitance cluster and be the S-shaped distribution in the third base plate, the second low voltage terminal the second high voltage terminal respectively with be located resistance-capacitance cluster start end and end the second resistor is connected, the second low voltage terminal with signal processing module connects, the second high voltage terminal with second binding post connects, and is a plurality of the third welding boss is along one side border interval distribution of the length direction of third base plate, every two is relative the shielding section passes through the third welding boss with correspond the second resistor and voltage dividing capacitor electricity is connected.

The voltage division capacitors with the same parameters can perform auxiliary voltage division into multiple sections of voltage to balance an electric field, reduce the pressure difference between the metering resistor and the shielding layer, reduce the insulation requirement, and can also be used as a power supply of the signal processing module, so that the energy is saved, and no extra power consumption is generated. And the second resistor is the wire-wound type power resistor that the parameter is the same, and impedance is less than voltage-dividing capacitor's capacitive reactance far away, can play the partial pressure effect on the one hand, can also form filter circuit on the one hand, has improved the interference killing feature.

In this application's optional embodiment, support the connecting element and include fourth base plate, pad and connecting wire, the multirow connecting hole has been seted up to the fourth base plate in length direction, every be equipped with near the connecting hole and correspond the pad, a plurality of the same row the pad passes through the connecting wire electricity is connected, power high pressure arm unit first shielding element the measurement voltage divider unit with the second shielding element is in connecting hole department connects in the fourth base plate.

The fourth substrate can provide a supporting base for other components, and the power supply high-voltage arm unit, the first shielding unit and the second shielding unit are connected together through the bonding pads and the connecting wires in the same column part, so that the metering voltage division unit is shielded in a segmented mode.

The segmented voltages are respectively electrically connected with the shielding sections of the shielding unit, so that the shielding sections have corresponding voltages, no suspension voltage exists, and the anti-interference capability is improved.

In an alternative embodiment of the present application, the fourth substrate includes four rows of the connection holes from top to bottom;

the first line of the connecting holes are used for being plugged with the power supply high-voltage arm unit and the second line of the connecting holes are used for being plugged with the first shielding unit and the third line of the connecting holes are used for being plugged with the metering voltage division unit and the fourth line of the connecting holes are used for being plugged with the second shielding unit.

In an alternative embodiment of the present application, the base housing comprises an epoxy insulated pipe, a first flange, a second flange, and a transformer enclosure;

the voltage dividing unit is arranged in the epoxy insulating pipe, silicon rubber is filled in the epoxy insulating pipe, one end of the first flange is connected with one end of the epoxy insulating pipe, the other end of the first flange is connected with the transformer shell, the first wiring terminal is arranged on the first flange, the signal processing module is contained in the first flange, the current transformer is arranged in the transformer shell, the second flange is connected to the other end of the epoxy insulating pipe, the second wiring terminal is arranged on the second flange, and a silicon rubber umbrella skirt is arranged on the periphery of the epoxy insulating pipe.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic diagram of a high voltage AC metering device provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of a voltage divider unit;

FIG. 3 is an isometric view of a voltage divider unit;

FIG. 4 is a left side view of FIG. 3;

FIG. 5 is a schematic diagram of a power high voltage arm unit;

FIG. 6 is a schematic view of a metering pressure divider unit;

fig. 7 is a schematic view of a first shielding unit;

FIG. 8 is a schematic view of a support connection unit;

FIG. 9 is a schematic diagram of the spatial projection and electric field interference of the first resistor;

fig. 10 is a schematic diagram of creepage distance.

Icon: 10-a transformer housing; 11-a current transformer; 20-a signal processing module; 30-a first baffle; 31-a second baffle; 40-silicon rubber umbrella skirt; 50-epoxy insulation pipe; 60-a second flange; 61-a second connection terminal; 62-a first flange; 63-a first connection terminal; 70-silicon rubber; 80-a partial pressure unit; 801-power high voltage arm unit; 80102 — second low voltage terminal; 80103-voltage divider capacitor; 80104-third substrate; 80107-second resistor; 80108-second high voltage terminal; 80109-third welding boss; 802-a first shielding element; 80202-a first welding boss; 80203-a first substrate; 803-metering partial pressure unit; 80301-output terminals; 80302 — a first low voltage terminal; 80303-a second welding boss; 80307-a second substrate; 80308-a first resistor; 80309-a first high voltage terminal; 804-a second shielding unit; 805-a support connection unit; 80501-connecting holes; 80502-pads; 80506-a fourth substrate; 8100-through holes; 8200-slotting; 8300-copper foil connecting lines; 8400-copper foil block.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the product conventionally places when used, and are only used for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.