阅读说明：本技术 一种陶瓷电容分压型相零序电压传感器 (Ceramic capacitor voltage division type phase zero sequence voltage sensor ) 是由 陈莹 周楠 赵美珍 于 2021-10-22 设计创作，主要内容包括：本发明提供一种陶瓷电容分压型相零序电压传感器,包括：两个高压臂电容、高压端子和低压臂电容；高压端子包括接线端和铜柱；铜柱焊接在接线端下方；接线端连接高压线；两个高压臂电容分别焊接在铜柱的两侧；高压臂电容的一端焊接在铜柱上,另一端通过导线与低压臂电容的正极端连接；两个高压臂电容分别为相序高压臂电容和零序高压臂电容；低压臂电容由多个贴片电容并联而成。本发明通过焊接在铜柱上的相序高压臂电容和零序高压臂电容分别与低压臂电容连接,低压臂采用多个贴片电容并联,其电容量及介质损耗比较稳定不随正负温度的变化而出现容值漂移,提高了产品精度,从而满足了相电压信号采集精度的要求。(The invention provides a ceramic capacitor voltage division type phase zero sequence voltage sensor, which comprises: two high-voltage arm capacitors, a high-voltage terminal and a low-voltage arm capacitor; the high-voltage terminal comprises a wiring end and a copper column; the copper column is welded below the wiring end; the wiring terminal is connected with a high-voltage wire; the two high-voltage arm capacitors are respectively welded on two sides of the copper column; one end of the high-voltage arm capacitor is welded on the copper column, and the other end of the high-voltage arm capacitor is connected with the positive electrode end of the low-voltage arm capacitor through a wire; the two high-voltage arm capacitors are respectively a phase sequence high-voltage arm capacitor and a zero sequence high-voltage arm capacitor; the low-voltage arm capacitor is formed by connecting a plurality of patch capacitors in parallel. The phase sequence high-voltage arm capacitor and the zero sequence high-voltage arm capacitor which are welded on the copper column are respectively connected with the low-voltage arm capacitor, the low-voltage arm adopts a plurality of patch capacitors which are connected in parallel, the capacitance and the dielectric loss of the low-voltage arm are relatively stable and do not drift with the change of positive and negative temperature, the product precision is improved, and the requirement of phase voltage signal acquisition precision is met.)

1. A ceramic capacitor voltage-dividing type phase zero-sequence voltage sensor is characterized by comprising: two high-voltage arm capacitors, a high-voltage terminal and a low-voltage arm capacitor;

the high-voltage terminal comprises a wiring end and a copper column; the copper column is welded below the wiring end; the wiring terminal is used for connecting a high-voltage wire;

the two high-voltage arm capacitors are respectively welded on two sides of the copper column; one end of the high-voltage arm capacitor is welded on the copper column, and the other end of the high-voltage arm capacitor is connected with the positive electrode end of the low-voltage arm capacitor through a wire; the two high-voltage arm capacitors are respectively a phase sequence high-voltage arm capacitor and a zero sequence high-voltage arm capacitor;

the low-voltage arm capacitor is formed by connecting a plurality of patch capacitors in parallel.

2. The ceramic capacitor voltage-dividing type phase zero-sequence voltage sensor as claimed in claim 1, wherein the medium of the high-voltage arm capacitor is NP0 (negative-positive 0ppm/° c /) dielectric ceramic.

3. The ceramic capacitive voltage-dividing type phase zero-sequence voltage sensor according to claim 1, wherein the structure of the high-voltage arm capacitor is an i-shaped structure.

4. The ceramic capacitive voltage-dividing type phase zero-sequence voltage sensor according to claim 3, wherein a center line of the groove of the drum structure of the high-voltage arm capacitor is parallel to a center line of the copper pillar.

5. The ceramic capacitor voltage-dividing type phase zero-sequence voltage sensor according to claim 1, wherein an adhesive is coated on the surface of the high-voltage arm capacitor.

6. The ceramic capacitive voltage-dividing type phase zero-sequence voltage sensor according to claim 1, further comprising a base; and the low-voltage arm capacitor is encapsulated in the base in a glue pouring manner.

7. The ceramic capacitor voltage-dividing type phase zero-sequence voltage sensor as claimed in claim 6, wherein the base is provided with a hole; and the low-voltage arm capacitor negative end lead, the phase sequence high-voltage arm low-voltage end lead and the zero sequence high-voltage arm low-voltage end lead penetrate out of the holes.

8. The ceramic capacitive voltage-dividing type phase zero-sequence voltage sensor according to claim 1, further comprising a flame-retardant insulator; and the high-voltage terminal and the two high-voltage arm capacitors are encapsulated in the flame-retardant insulator in an encapsulating way.

Technical Field

The invention relates to the field of monitoring, in particular to a ceramic capacitor voltage division type phase zero sequence voltage sensor.

Background

At present, the ceramic capacitor voltage division type voltage sensor has the characteristics of simple manufacturing process, no capacitance attenuation, small size and the like, is mainly used for acquiring zero sequence voltage signals in the large-scale construction of a power distribution network, but is difficult to meet the precision requirement in the temperature change range due to the fact that the low-voltage arm capacitor is inconsistent with the high-voltage arm capacitor in the aspects of material and structure, and therefore the precision requirement for acquiring phase voltage signals cannot be met.

Disclosure of Invention

The invention aims to provide a ceramic capacitor voltage division type phase zero sequence voltage sensor which can meet the precision requirement of phase voltage signal acquisition.

In order to achieve the purpose, the invention provides the following scheme:

a ceramic capacitive voltage-dividing type phase zero-sequence voltage sensor comprising: two high-voltage arm capacitors, a high-voltage terminal and a low-voltage arm capacitor;

the high-voltage terminal comprises a wiring end and a copper column; the copper column is welded below the wiring end; the wiring terminal is used for connecting a high-voltage wire;

the two high-voltage arm capacitors are respectively welded on two sides of the copper column; one end of the high-voltage arm capacitor is welded on the copper column, and the other end of the high-voltage arm capacitor is connected with the positive electrode end of the low-voltage arm capacitor through a wire; the two high-voltage arm capacitors are respectively a phase sequence high-voltage arm capacitor and a zero sequence high-voltage arm capacitor;

the low-voltage arm capacitor is formed by connecting a plurality of patch capacitors in parallel.

Optionally, the medium of the high-voltage arm capacitor is NP0 (negative-positive 0ppm/° c/, low-temperature drift) dielectric ceramic.

Optionally, the structure of the high-voltage arm capacitor is an i-shaped structure.

Optionally, a centerline of the groove of the drum structure of the high voltage arm capacitor is parallel to a centerline of the copper pillar.

Optionally, an adhesive is coated on the surface of the high-voltage arm capacitor.

Optionally, the ceramic capacitor voltage division type phase zero sequence voltage sensor further includes a base; and the low-voltage arm capacitor is encapsulated in the base in a glue pouring manner.

Optionally, the base is provided with a hole; and the low-voltage arm capacitor negative end lead, the phase sequence high-voltage arm low-voltage end lead and the zero sequence high-voltage arm low-voltage end lead penetrate out of the holes.

Optionally, the ceramic capacitance voltage division type phase zero sequence voltage sensor further comprises a flame retardant insulator; and the high-voltage terminal and the two high-voltage arm capacitors are encapsulated in the flame-retardant insulator in an encapsulating way.

According to the specific embodiment provided by the invention, the invention discloses the following technical effects:

the invention provides a ceramic capacitor voltage division type phase zero sequence voltage sensor, which comprises: two high-voltage arm capacitors, a high-voltage terminal and a low-voltage arm capacitor; the high-voltage terminal comprises a wiring end and a copper column; the copper column is welded below the wiring end; the wiring terminal is connected with a high-voltage wire; the two high-voltage arm capacitors are respectively welded on two sides of the copper column; one end of the high-voltage arm capacitor is welded on the copper column, and the other end of the high-voltage arm capacitor is connected with the positive electrode end of the low-voltage arm capacitor through a wire; the two high-voltage arm capacitors are respectively a phase sequence high-voltage arm capacitor and a zero sequence high-voltage arm capacitor; the low-voltage arm capacitor is formed by connecting a plurality of patch capacitors in parallel. The phase sequence high-voltage arm capacitor and the zero sequence high-voltage arm capacitor which are welded on the copper column are respectively connected with the low-voltage arm capacitor, and each phase sequence secondary voltage is formed by dividing the voltage of each phase sequence low-voltage arm capacitor and each phase sequence high-voltage arm capacitor; the zero sequence low-voltage arm capacitors are shared, three-phase zero sequence primary voltage enters the zero sequence low-voltage arm capacitors simultaneously to be divided into zero sequence voltage, the low-voltage arm adopts a plurality of patch capacitors which are connected in parallel, the capacitance and the dielectric loss of the low-voltage arm are relatively stable, the capacitance value does not drift along with the change of positive and negative temperatures, the product precision is improved, and the requirement of phase voltage signal acquisition precision is met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is an assembled structure diagram of a ceramic capacitor voltage-dividing type phase zero-sequence voltage sensor according to the present invention;

FIG. 2 is a schematic diagram of a low-voltage arm capacitor of a ceramic capacitor voltage-dividing type phase zero-sequence voltage sensor according to the present invention;

FIG. 3 is a working schematic diagram of a ceramic capacitor voltage-dividing type phase zero-sequence voltage sensor according to the present invention;

fig. 4 is a partial cross-sectional view of the ceramic capacitor voltage-dividing type phase zero-sequence voltage sensor according to the present invention.

Description of the symbols:

the high-voltage circuit comprises a high-voltage terminal-1, a phase sequence high-voltage arm capacitor-2, a zero sequence high-voltage arm capacitor-3, a phase sequence high-voltage arm low-voltage end lead-out wire-4, a zero sequence high-voltage arm low-voltage end lead-out wire-5, a flame-retardant insulator-6, a base-7, a chip capacitor-8, a low-voltage arm capacitor positive end lead-out wire-9 and a low-voltage arm capacitor negative end lead-out wire-10.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.

The invention aims to provide a ceramic capacitor voltage division type phase zero sequence voltage sensor which can meet the requirement of precision for acquiring phase voltage signals.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1, the ceramic capacitor voltage-dividing type phase zero-sequence voltage sensor provided by the present invention includes: two high voltage arm capacitors, a high voltage terminal 1 and a low voltage arm capacitor.

The high-voltage terminal 1 comprises a wiring end and a copper column; the copper column is welded below the wiring end; the wiring terminal is used for connecting a high-voltage wire; the two high-voltage arm capacitors are respectively welded on two sides of the copper column; one end of the high-voltage arm capacitor is welded on the copper column, and the other end of the high-voltage arm capacitor is connected with the positive electrode end 9 of the low-voltage arm capacitor through a wire; the two high-voltage arm capacitors are respectively a phase sequence high-voltage arm capacitor 2 and a zero sequence high-voltage arm capacitor 3.

As an embodiment of the present invention, the ceramic capacitance voltage division type phase zero sequence voltage sensor further includes a phase sequence high voltage arm low voltage end lead 4, a zero sequence high voltage arm low voltage end lead 5, a phase sequence high voltage arm high voltage end lead, and a zero sequence high voltage arm high voltage end lead; one end of a phase sequence high-voltage arm high-voltage end lead is welded on the copper column, the other end of the phase sequence high-voltage arm high-voltage end lead is connected with one end of a phase sequence high-voltage arm capacitor 2, the other end of the phase sequence high-voltage arm capacitor 2 is connected with one end of a phase sequence high-voltage arm low-voltage end lead 4, and the other end of the phase sequence high-voltage arm low-voltage end lead 4 is connected with a low-voltage arm capacitor positive end; one end of the zero sequence high-voltage arm high-voltage end lead is welded on the copper column, the other end of the zero sequence high-voltage arm high-voltage end lead is connected with one end of the zero sequence high-voltage arm capacitor 3, the other end of the zero sequence high-voltage arm capacitor 3 is connected with one end of the zero sequence high-voltage arm low-voltage end lead 5, and the other end of the zero sequence high-voltage arm low-voltage end lead 5 is connected with the positive electrode end of the low-voltage arm capacitor. The low-voltage arm capacitor connected with the zero-sequence high-voltage arm capacitor 3 is a zero-sequence low-voltage arm capacitor; and the low-voltage arm capacitor connected with the phase sequence high-voltage arm capacitor 2 is a phase sequence low-voltage arm capacitor.

Specifically, the medium of the high-voltage arm capacitor is NP0 dielectric ceramic.

Furthermore, the high-voltage arm capacitor adopting NP0 dielectric ceramic as a medium has zero temperature drift characteristics, the bias characteristics are stable, and in the boosting process, the capacity change rate of the high-voltage arm capacitor is small, so that the stability of errors is ensured.

Specifically, the structure of the high-voltage arm capacitor is an I-shaped structure.

Furthermore, the high-voltage arm capacitor adopts an I-shaped structure, is a special-shaped capacitor, and compared with the column-shaped ceramic capacitor used in the existing market, the external creepage distance of the high-voltage arm capacitor adopting the I-shaped structure is improved, and the internal creepage distance is effectively increased.

Specifically, the surface of the high-voltage arm capacitor is coated with the adhesive, so that the bonding force of an epoxy and ceramic interface is improved, and creepage breakdown of high voltage along the outer surface of the high-voltage arm capacitor due to the existence of an air gap in the sensor is prevented.

Specifically, the central line of the groove of the I-shaped structure of the high-voltage arm capacitor is parallel to the central line of the copper column; the design avoids the difficulty of bubble discharge when the product is filled with glue, changes the traditional mounting structure mode and improves the partial discharge performance of the product.

Specifically, the ceramic capacitor voltage division type phase zero sequence voltage sensor further comprises a flame-retardant insulator 6; the high-voltage terminal 1 and the two high-voltage arm capacitors are encapsulated in the flame-retardant insulator 6.

As shown in fig. 2, the low-voltage arm capacitor is formed by connecting a plurality of patch capacitors 8 in parallel.

Specifically, the low-voltage arm capacitor is formed by connecting a plurality of patch capacitors 8 in parallel and performing fine tuning welding, and a low-voltage arm capacitor positive end lead 9 and a low-voltage arm capacitor negative end lead 10 are respectively led out from two ends of the low-voltage arm capacitor; the capacitance and the dielectric loss of the multiple patch capacitors 8 of the low-voltage arm capacitor are stable, the content of the capacitor changes to 0 within the temperature range of-40 ℃ to +70 ℃, the capacitor value does not drift along with the change of positive and negative temperatures, the running deviation of a product is reduced, and the precision of the product is greatly improved.

Further, the ceramic capacitor voltage division type phase zero sequence voltage sensor also comprises a base 7; the low-voltage arm capacitor potting adhesive is encapsulated in the base 7; a hole is arranged on the base 7; and the low-voltage arm capacitor negative end lead 10, the phase sequence high-voltage arm low-voltage end lead 4 and the zero sequence high-voltage arm low-voltage end lead 5 penetrate out of the holes.

During assembly, after the two high-voltage arm capacitors are encapsulated in the flame-retardant insulator 6 in a potting manner, the phase-sequence high-voltage arm low-voltage end lead 4 and the zero-sequence high-voltage arm low-voltage end lead 5 are left outside the flame-retardant insulator 6; the two low-voltage arms are electrically accommodated in the base 7, one low-voltage arm capacitor positive end lead 9 is connected with the phase sequence high-voltage arm low-voltage end lead 4, the other low-voltage arm capacitor positive end lead 9 is connected with the zero sequence high-voltage arm low-voltage end lead 5, the two low-voltage arm capacitor negative end leads 10 penetrate through holes in the base 7, then the base 7 is encapsulated by glue pouring, and the low-voltage arm capacitor negative end lead 10 is grounded.

As shown in fig. 3, C1 is the phase-sequence high-voltage arm capacitor 2, and C2 is the phase-sequence low-voltage arm capacitor; c01 is a zero-sequence high-voltage arm capacitor 3, and C0 is a zero-sequence low-voltage arm capacitor; A. b, C are three-phase power in a three-phase system respectively; ua + is the output voltage of the A-phase capacitance anode of the high-voltage arm; ub + is the B-phase capacitance anode output voltage of the high-voltage arm; uc + is the output voltage of the C-phase capacitance anode of the high-voltage arm; uo + is the positive output voltage of the zero sequence high-voltage arm capacitor, and Ucom + is the negative of the secondary voltage. The wiring end of the high-voltage terminal 1 is connected with a high-voltage wire, the three high-voltage wires are connected with the three high-voltage terminals 1, each high-voltage wire is connected with one phase of three-phase electricity, and each phase sequence secondary voltage is formed by dividing the voltage of each phase sequence low-voltage arm capacitor and each phase high-voltage arm capacitor; the zero sequence low-voltage arm capacitors are shared, and three-phase zero sequence primary voltage simultaneously enters the zero sequence low-voltage arm capacitors to be divided into zero sequence voltage.

As shown in fig. 4, as an embodiment of the present invention, the low-voltage arm capacitors of the three ceramic capacitor voltage-dividing type phase-zero-sequence voltage sensors are encapsulated in the same base, so that the three ceramic capacitor voltage-dividing type phase-zero-sequence voltage sensors are fixed together. And after the low-voltage arm capacitor is encapsulated in the same base by glue pouring, a hole is formed in the base, and the A, B, C three-phase sequence high-voltage arm low-voltage end lead, the A, B, C three-phase zero sequence high-voltage arm low-voltage end lead and the low-voltage arm capacitor negative end lead penetrate out of the hole.

In addition, can encapsulate the low pressure arm electric capacity encapsulating of a plurality of ceramic electric capacity partial pressure type looks zero sequence voltage sensor in same base as required for a plurality of ceramic electric capacity partial pressure type looks zero sequence voltage sensor are together fixed, the trompil on the base, and the quantity of trompil sets up as required, and phase sequence high voltage arm low pressure end lead wire, zero sequence high voltage arm low pressure end lead wire and low pressure arm electric capacity negative pole end lead wire wear out from the hole.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.