CN103792403A

CN103792403A - High-voltage divider

Info

Publication number: CN103792403A
Application number: CN201210421084.7A
Authority: CN
Inventors: 杨丽琴
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-10-30
Filing date: 2012-10-30
Publication date: 2014-05-14

Abstract

The invention relates to a high-voltage divider and belongs to the technical field of power industry devices. The high-voltage divider of the invention is mounted on a ceramic rod. Imported raw slurries and imported production process are adopted in the production of a resistance film; in order to eliminate the influence of capacitance distributed capacitance on the divider, the outer layer of the divider is sleeved with an equal-altitude high-voltage thick-filmed resistor; in order to adapt to integrated pour encapsulation of resin and silica gel of the divider, the middle layer of the divider is filled with a buffer material; and the outermost layer of the divider is coated with a buffer film, and therefore, the divider has excellent adhesion and stress resistant performance. According to the high-voltage divider of the invention, technological measures such as of compensation and shielding are adopted for the divider, and therefore, standard output of the divider can be ensured.

Description

High-voltage bleeder

Technical field

The present invention relates to a kind of high-voltage bleeder, belong to power industry device technology field.

Background technology

Online high pressure (10kV, 35kV) is measured, is monitored and protection; the normal electronic mutual inductor that adopts a kind of electric resistance partial pressure technology; replace traditional electromagnetic potential transformer, because of its have volume little, lightweight, unsaturated, without ferroresonance and many advantages such as service band is wide.Can not but why this kind of electronic mutual inductor replace traditional electromagnetic transformer so far completely? except reasons such as national policy, use habit, auxiliary facilities, wherein the most important is to adopt the electronic mutual inductor of electric resistance partial pressure technology still to have a lot of incomplete places, such as poor stability, temperature is floated greatly, is easily disturbed etc.Trace it to its cause be exactly resitstance voltage divider self characteristic cause and rise, high pressure (10kV, the 35kV) electronic mutual inductor of all employing electric resistance partial pressure technology, his core parts divider resistance inevitably can be subject to the impact of distribution parameter, these distribution parameters comprise: the distributed capacitance between voltage divider height pressure arm resistance, longitudinal electric capacity of voltage divider body, high-field electrode is the stray capacitance to voltage divider body at interior high-pressure side, voltage divider body is respectively to high pressure, stray capacitance over the ground, and voltage divider is the stray capacitance of running environment to external world.The existence of these distribution parameters makes the technical parameter of voltage divider become complexity just, the high pressure applying is no longer evenly landed along the total length of voltage divider body, axial current potential no longer constant gradient is uniformly distributed, thereby causes actual output and theoretical value to have amplitude and phase error.On the other hand, voltage divider height pressure arm temperature-coefficient of electrical resistance, the consistance of the electric parameter performances such as voltage coefficient is also a vital factor that affects dividing potential drop.

Summary of the invention

The object of this invention is to provide a kind of high-voltage bleeder, solve the above-mentioned distribution parameter impact of the core parts resitstance voltage divider existence in existing electronic mutual inductor and the deficiency of technical parameter complexity, guarantee the standard output of voltage divider by the present invention.

The object of the invention is to be achieved through the following technical solutions, a kind of high-voltage bleeder, it is characterized in that, the kernel of described structure is a ceramic rod that is coated with height pressure arm resistive film, set it as the body of voltage divider, voltage divider body is drawn signal electrode, respectively outwards buffering insulating medium layer from body, one deck buffer film that equivalent potential screen scribbles with resistive layer and equivalent potential screen resistive layer outside, voltage divider body, buffering insulating medium layer, equivalent potential screen is drawn high-field electrode with the fixing silver-plated copper cap in one end of resistive layer, high pressure is installed on high-field electrode and all presses radome, the fixing silver-plated copper cap of the other end is drawn ground-electrode, ground connection is installed on ground-electrode and all presses radome.

The described ceramic rod that is coated with height pressure arm resistive film.

Described buffering insulating medium layer.

Described equivalent potential screen resistive layer.

The centre of described silver-plated copper cap has threaded hole.

Described high pressure all presses radome, ground connection all to press the centre of radome to have the center pit corresponding with the threaded hole in silver-plated copper cap centre.

The present invention adopts integrated design proposal, and voltage divider body designs on a ceramic rod.The production of resistive film all adopts the former slurry of import and import production technology, and adopt advanced laser resistor trimming technology, thereby guarantee the consistance of the electric properties such as voltage divider temperature coefficient, voltage coefficient, temperature coefficient≤the 20PPM of final products, voltage coefficient≤0.2PPM, makes it not be subject to the variation of ambient temperature and changes.In order to eliminate the impact of distributed capacitance on voltage divider, be set with the high-voltage thick-film resistance of an equal altitudes at the skin of voltage divider, and the cabling mode of its resistive film and voltage divider body cabling mode are consistent, so just guarantee to keep equivalent on any corresponding some current potentials of ectonexine.This measure effectively suppresses and has cut off the distributed capacitance of voltage divider and external environment formation, makes the current potential of voltage divider be the decline of constant gradient.Certainly it is unlikely eliminating distributed capacitance completely, because outer field shielding resistance still forms distributed capacitance with external environment.For this reason, this voltage divider is at high-pressure side, and earth terminal has all been installed and all pressed radome, the electric field of voltage divider is concentrated, and reduced the corona discharge of high-field electrode and improved electromagnetism interference free performance.In order to adapt to the overall embedding of voltage divider resin and silica gel, fill buffer substance in the middle layer of voltage divider, outermost layer has applied buffer film, makes voltage divider have good bonding and anti-stress performance.The present invention, owing to voltage divider having been taked to the technical measures such as compensation, shielding, has guaranteed the standard output of voltage divider.

Adopt above technical scheme and measure, product is finally exported: ratio≤0.2%, angular difference≤± 10 point.Performance is very stable, meets the standard-required of measuring 0.2 grade completely, without secondary conditioning unit.

Accompanying drawing explanation

Fig. 1 is sectional structure schematic diagram of the present invention;

In figure, 1 voltage divider body, 2 buffering insulating medium layers, 3 equivalent potential screen resistive layers, 4 buffer films, 5 high-field electrodes, 6 ground-electrodes, 7 high pressure are all pressed radome, and 8 ground connection are all pressed radome, 9 signal electrodes.

Embodiment

Further illustrate in conjunction with the accompanying drawings and embodiments the present invention, as shown in Figure 1, kernel of the present invention is a ceramic rod that is coated with height pressure arm resistive film, set it as the body 1 of voltage divider, voltage divider body 1 is drawn signal electrode 9, respectively outwards buffering insulating medium 2 from body 1, one deck buffer film 4 that equivalent potential screen scribbles with resistance 3 and equivalent potential screen resistance 3 outsides, silver-plated copper cap with threaded hole is housed at the two ends of voltage divider and draws high-field electrode 5 and ground-electrode 6, on high-field electrode 5 and ground-electrode 6, being separately installed with high pressure all presses radome 7 and ground connection all to press radome 8.

Claims

1. a high-voltage bleeder, it is characterized in that, the kernel of described structure is a ceramic rod that is coated with height pressure arm resistive film, set it as the body of voltage divider, voltage divider body is drawn signal electrode, respectively outwards buffering insulating medium layer from body, one deck buffer film that equivalent potential screen scribbles with resistive layer and equivalent potential screen resistive layer outside, voltage divider body, buffering insulating medium layer, equivalent potential screen is drawn high-field electrode with the fixing silver-plated copper cap in one end of resistive layer, high pressure is installed on high-field electrode and all presses radome, the fixing silver-plated copper cap of the other end is drawn ground-electrode, ground connection is installed on ground-electrode and all presses radome.

2. high-voltage bleeder according to claim 1, is characterized in that, the described ceramic rod that is coated with height pressure arm resistive film.

3. high-voltage bleeder according to claim 1, is characterized in that, described buffering insulating medium layer.

4. high-voltage bleeder according to claim 1, is characterized in that, described equivalent potential screen resistive layer.

5. high-voltage bleeder according to claim 1, is characterized in that, the centre of described silver-plated copper cap has threaded hole.

6. high-voltage bleeder according to claim 1, is characterized in that, described high pressure all presses radome, ground connection all to press the centre of radome to have the center pit corresponding with the threaded hole in silver-plated copper cap centre.