阅读说明：本技术 一种10kV电容式分压器 (kinds of 10kV capacitance voltage divider ) 是由 孙明 孙晓武 李冲 王晓明 冯源 杨一民 于 2019-11-26 设计创作，主要内容包括：本发明公开了一种10kV电容式分压器,电容式分压器主要由外壳、第一分压器单元、第二分压器单元、绝缘架和填充的树脂构成,外壳由壳体和高压接线端子组成,通过模具浇注而成一体,第一分压器单元由第一高压引出线、第一高压臂电容器、第一低压臂电容器、第一中心端接线、第一分压信号输出线、第一接地线,第二分压器单元由第二高压引出线、第二高压臂电容器、第二低压臂电容器、第二中心端接线、第二分压信号输出线、第二接地线,绝缘架由2只绝缘件和包扎带组成,填充的树脂包括填满外壳、第一分压器单元、第二分压器单元和绝缘架之间的缝隙。本发明结构简单,安装使用方便,可以满足电容器在户内外环境条件下长期安全、稳定、可靠工作的要求。(The invention discloses an type 10kV capacitive voltage divider, which mainly comprises a shell, a voltage divider unit, a second voltage divider unit, an insulating frame and filled resin, wherein the shell consists of a shell and a high-voltage connecting terminal, a 0 body is formed by die casting, the voltage divider unit consists of a high-voltage outgoing line, a high-voltage arm capacitor, a low-voltage arm capacitor, a central terminal wire, a voltage dividing signal output line and a ground wire, the second voltage divider unit consists of a second high-voltage outgoing line, a second high-voltage arm capacitor, a second low-voltage arm capacitor, a second central terminal wire, a second voltage dividing signal output line and a second ground wire, the insulating frame consists of 2 insulating pieces and a wrapping tape, and the filled resin fully fills gaps among the shell, the voltage divider unit, the second voltage divider unit and the insulating frame.)

1, kinds of 10kV capacitive voltage dividers are characterized in that the composite transformer mainly comprises a shell, a th voltage divider unit and a second voltage divider unit

The second voltage divider unit consists of a second high-voltage lead wire 0, a high-voltage arm capacitor, an th low-voltage arm capacitor, a 3 central terminal wire, a th voltage dividing signal output wire and a th ground wire, the second voltage divider unit consists of a second high-voltage lead wire , a second high-voltage arm capacitor, a second low-voltage arm capacitor, a second central terminal wire, a second voltage dividing signal output wire and a second ground wire, the insulating frame consists of 2 insulating pieces and a bundling belt, the 2 insulating pieces are crossed to form a cross frame, the separated areas of the cross frame are sequentially placed into a th high-voltage arm capacitor, a th low-voltage arm capacitor, a second low-voltage arm capacitor 7, the second high-voltage arm capacitor and the second low-voltage arm capacitor, the bundling belt penetrates through a preformed hole of the insulating pieces, the ends of the first high-voltage lead wire and the second high-voltage lead wire 469 end of the second high-voltage arm penetrate through a high-voltage arm capacitor terminal wire , the high-voltage arm terminal wire, the insulating frame penetrates through a high-voltage arm terminal wire, the insulating frame penetrates through a seam of the upper end face of the second high-voltage arm capacitor, the insulating frame penetrates through a seam of the insulating frame, the seam of the second high-voltage lead wire 469 end face of the second high-voltage lead wire 469 terminal wire of the second high-voltage lead wire, the second high-voltage arm high-voltage lead wire, the second high-voltage arm is connected with the.

2. The capacitive voltage divider according to claim 1, characterized in that: the shell is formed by casting through a die and is made of materials

The cable is outdoor epoxy resin, the interior has the cylinder of cavity, and the bottom still has 4 installation pieces that have the through-hole that supply the installation to use, creepage distance 240 mm.

3. The capacitive voltage divider according to claim 1, characterized in that: high-voltage wiring terminal upper end surface inner thread knot

The structure has 1 through hole with a conical upper end, is convenient to weld and is made of aluminum alloy.

Technical Field

The invention belongs to the field of electrical measurement, and particularly relates to types of 10kV capacitive voltage dividers for measuring sampling signals of distribution network electrical measurement.

Background

Voltage dividers are important components of electrical measurements in power systems. There are many kinds of voltage dividers, such as: electromagnetic voltage transformers, capacitor voltage transformers, traditional power frequency voltage dividers, photoelectric voltage sensors and the like.

The electromagnetic voltage transformer uses SF6 as a main insulating material, has high voltage grade and has the following defects: ferromagnetic nonlinearity easily takes place ferromagnetic resonance in the electric wire netting, and its insulation construction is complicated, and insulating properties is not good, along with the improvement of voltage class its manufacturing cost nonlinearity increase. The traditional oil-immersed capacitor voltage transformer has poor error stability and is influenced by factors such as temperature, frequency, adjacent articles, high-voltage lead arrangement and the like. The traditional power frequency voltage divider can be divided into a coupling capacitance type, a resistance type and a resistance-capacitance type, and the traditional power frequency voltage divider is greatly influenced by surrounding articles and high-voltage leads and is greatly influenced by environmental conditions (particularly relative humidity and dirt). The photoelectric voltage sensor is affected by temperature, vibration, device stability and reliability, signal modulation and demodulation errors and electric field distribution (adjacent objects), and is difficult to meet the requirements of metering and standard devices.

At present, a resistance type voltage divider is commonly adopted in domestic 10kV power grids to sample the electric quantity of the high-voltage side power grid. Resistive voltage dividers have disadvantages: the power loss is large, the volume is large, and the operation economy is poor. Advantages of capacitive voltage dividers compared to resistive voltage dividers: the compression strength is high, and the breakdown is not easy; the response time value of the frequency response effect is large. Therefore, the capacitive voltage divider becomes a new voltage divider in a 10kV power grid.

The capacitor in the capacitive voltage divider has the following 3 forms:

1) the capacitor adopts ceramic capacitor, its advantage is high dielectric constant, the shortcoming is: the voltage is low, the capacity is small, the stability of the capacity is poor, and the amplitude of the capacity changing along with the temperature, the voltage and the time is large;

2) the high-voltage capacitor adopts the distributed capacitance between the high-voltage electrode and the low-voltage electrode, and the low-voltage capacitor adopts a metallized film capacitor, and has the defects that: the two types of capacitors have different dielectrics, different temperature coefficients and different capacities along with temperature and voltage amplitude;

3) the high-voltage capacitor and the low-voltage capacitor are both metallized film capacitors, the high-voltage capacitor is formed by connecting a plurality of capacitor elements in series,

the high-voltage capacitor and the low-voltage capacitor adopt different dielectric thicknesses, and have the following defects: the high-low voltage following characteristic is unstable, and the partial discharge performance index is poor.

Therefore, a new capacitive voltage divider is needed to solve the above technical problem.

Disclosure of Invention

The invention provides types of 10kV capacitive voltage dividers aiming at the requirement of a power system distribution network for measuring sampling signals.

The technical scheme adopted by the invention is as follows.

The invention provides a type 10kV capacitive voltage divider, which mainly comprises a shell, a voltage divider unit, a second voltage divider unit, an insulating frame and filled resin, wherein the shell consists of a shell and a high-voltage terminal, and is formed by casting a 0 body through a die, the 1 voltage divider unit consists of a 2 high-voltage lead-out wire, a 3 high-voltage arm capacitor, a 4 low-voltage arm capacitor, a center terminal wire, a voltage dividing signal output wire and a ground wire, the second voltage divider unit consists of a second high-voltage lead-out wire, a second high-voltage arm capacitor, a second low-voltage arm capacitor, a second center terminal wire, a second voltage dividing signal output wire and a second ground wire, the insulating frame consists of 2 insulators and a binding tape, 2 insulators are crossed to form a cross frame, the cross frame is divided into a high-voltage arm capacitor, a low-voltage arm capacitor, a second high-voltage arm capacitor and a second low-voltage arm capacitor, the isolated area is sequentially placed into a high-voltage arm capacitor, a 598 high-voltage arm capacitor, a low-voltage arm capacitor, a 3614 low-voltage arm capacitor and a second low-voltage-arm capacitor, the high-voltage arm capacitor is placed into a terminal surface, a 3614 high-voltage arm- terminal surface of a high-voltage arm-terminal surface, a high-voltage arm-terminal surface of a high-arm-terminal, a high-arm-voltage arm-welded joint, a -welded joint welded unit is arranged between the upper end of the high-welded joint.

The casing forms through the mould pouring, and the material is outdoor epoxy, and inside has the cylinder of cavity, and the bottom still supplies 4 installation pieces that have the through-hole of installation use, 8 shirt rim structures, creepage distance 240 mm.

The thread structure in the upper end face of the high-voltage wiring terminal is provided with 1 through hole with the conical upper end, so that the welding is convenient, and the material is aluminum alloy.

the voltage divider unit and the second voltage divider unit are used for measuring zero sequence voltage and phase sequence voltage respectively.

The high-voltage arm capacitor and the second high-voltage arm capacitor are of single-element structures, capacitor elements are formed by winding same 33-inner-string-structured metalized films and spraying gold at two ends, and the capacitance values are all 600 pF.

low-voltage arm capacitor and the second low-voltage arm capacitor adopt single element structure, the capacitor element is formed by winding the same metalized film with 2 inner series structure and spraying gold at two ends, and the capacitance values are different and are 1.85pF and 1.6pF respectively.

The material of a high-voltage outgoing line, a central terminal line, a divided voltage signal output line, a ground line, a second high-voltage outgoing line, a second central terminal line, a second divided voltage signal output line and a second ground line is phi 0.6mm²A copper wire.

The insulating part adopts the epoxy board of 2mm thick, has the breach of width 2.2mm, dark 11mm in the middle, and both sides all have the hole of diameter 2 mm.

The filled resin material is polyurethane and is cured at normal temperature.

, the high-voltage arm capacitor, the second high-voltage arm capacitor, the low-voltage arm capacitor and the second low-voltage arm capacitor adopt films with the same thickness and different widths, and the temperature coefficient problem is solved, so that the voltage following characteristic is solved.

, the high voltage arm capacitor, the second high voltage arm capacitor, the low voltage arm capacitor and the second low voltage arm capacitor all adopt a plurality of strings of metallized films to solve the partial discharge performance.

, the shell is made of outdoor epoxy resin, the creepage distance is 240mm, and the insulation meets the requirement of the indoor and outdoor insulation level of the power system.

The invention has the advantages that the -type 10kV capacitive voltage divider for measuring sampling signals according to the distribution network power of a power system can solve the temperature influence and the high-low voltage following characteristic and improve the partial discharge performance.

The invention has simple structure and convenient installation and use, and can meet the requirements of long-term safe, stable and reliable operation of the capacitor under indoor and outdoor environmental conditions.

Drawings

Fig. 1 is a schematic diagram of a 10kV capacitive voltage divider according to the present invention.

Fig. 2 is a front partial sectional view of fig. 1.

Fig. 3 is a bottom up partial cross-sectional view of fig. 1.

Fig. 4 is an enlarged view of a portion a of fig. 1.

Fig. 5 is a schematic structural view of the insulating member.

In the figure, 1-the housing, 2-the th voltage divider unit, 3-the second voltage divider unit, 4-the insulating frame, 5-the filled resin;

11-a housing; 12-a high voltage connection terminal;

21- high-voltage leading-out wire, 22- high-voltage arm capacitor, 23- low-voltage arm capacitor, 24- central terminal wire, 25- divided-voltage signal output wire, 26- ground wire;

31-a second high voltage outlet; 32-a second high-arm capacitor; 33-a second low-voltage arm capacitor; 34-a second center terminal line; 35-a second divided signal output line; 36-a second ground line;

41-an insulator; 42-wrap tie.

Detailed Description

The invention is further described with reference to the figures and the specific embodiments.

As can be seen from figure 1, the 10kV capacitive voltage divider is mainly composed of a shell (1), an th voltage divider unit (2), a second voltage divider unit (3), an insulating frame (4) and filled resin (5).

As shown in figure 2, the shell (1) consists of a shell body (11) and a high-voltage connecting terminal (12) and is formed by casting bodies through a mould, the shell body (11) is formed by casting through the mould, a cylinder with a cavity is arranged inside the shell body, 4 mounting blocks with through holes are arranged at the bottom of the shell body for mounting, the skirt structure is 8, and the creepage distance is 240 mm.

The th voltage divider unit (2) is composed of a high voltage outgoing line (21), a th high voltage arm capacitor (22), a th low voltage arm capacitor (23), a th central terminal line (24), a th voltage dividing signal output line (25) and a ground line (26). the second voltage divider unit (3) is composed of a second high voltage outgoing line (31), a second high voltage arm capacitor (32), a second low voltage arm capacitor (33), a second central terminal line (34), a second voltage dividing signal output line (35) and a second ground line (36). the filled resin (5) comprises a gap filled between the shell (1), the voltage divider unit (2), the second voltage divider unit (3) and the insulation frame (4).

As can be seen from figures 3 and 4, the insulating frame (4) consists of 2 insulating pieces (41) and a binding belt (42), the 2 insulating pieces (41) are crossed to form a cross-shaped frame, the th high-voltage arm capacitor (22), the th low-voltage arm capacitor (23), the second high-voltage arm capacitor (32) and the second low-voltage arm capacitor (32) are sequentially placed in separated areas, and the binding belt (42) penetrating through a reserved hole of the insulating pieces (41) is tightly bound.

The ends of the high-voltage lead wire (21) and the second high-voltage lead wire (31) penetrate through a small hole of the high-voltage connecting terminal (12) and are welded at 0 to be connected with the high-voltage connecting terminal (12), the other end of the 1 high-voltage lead wire (21) is welded at the upper end face of the high-voltage arm capacitor (22), the central end connecting wire (24) of the is respectively welded at the lower end face of the high-voltage arm capacitor (22) and the lower end face of the low-voltage arm capacitor (23), meanwhile, the voltage dividing signal output wire (25) is led out, and the upper end face of the low-voltage arm capacitor (23) is welded with the grounding wire (26) led out.

The other end of the second high-voltage lead wire (31) is welded on the upper end face of the second high-voltage arm capacitor (32), the second central terminal wire (34) is respectively welded on the lower end face of the second high-voltage arm capacitor (32) and the lower end face of the second low-voltage arm capacitor (33), a second voltage division signal output wire (35) is led out at the same time, and the upper end face of the second low-voltage arm capacitor (33) is welded and led out a second grounding wire (36).

As can be seen from fig. 5: the insulating part (41) adopts an epoxy plate with the thickness of 2mm, a gap with the width of 2.5mm and the depth of 11mm is arranged in the middle, and holes with the diameter of 2mm are arranged on the two sides.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.