CN205427013U - Hierarchical formula voltage transformer - Google Patents

Abstract

The utility model relates to a hierarchical formula voltage transformer, including the interior insulating medium layer and outer insulating medium layer that the coaxial line set up, the internal surface subsides on interior insulating medium layer are equipped with the first metal layer, the surface subsides on interior insulating medium layer are equipped with the second metal level, the internal surface subsides on outer insulating medium layer are equipped with the third metal layer that lies in the second metal level outside, the surface subsides on outer insulating medium layer are equipped with the fourth metal level, the second metal level includes at least one inboard low -voltage electrode, third metal layer includes the outside low -voltage electrode with inboard low -voltage electrode number one -to -one, inboard low -voltage electrode with correspond outside the low -voltage electrode short circuit. The utility model provides an among the prior art metal level, insulating medium layer, metal level, insulating medium layer, this kind of problem that sets up the structure in succession and have relatively high expectations to processing technology of metal level.

Description

Stagewise voltage transformer

Technical field

This utility model relates to a kind of stagewise voltage transformer.

Background technology

Along with power system develops to Large Copacity, supertension and extra-high voltage direction; to power equipment miniaturization; intelligent; the requirement of high reliability is more and more higher; intelligent grid 110KV and above power station are measured system and propose the principle of double protection by national grid; in order to meet current intelligent grid requirement, need a kind of miniaturization, reliability height, precision much higher output type voltage transformer badly.This type of voltage transformer existing such as Chinese patent CN203772925U is disclosed " GIS multi output electronic type voltage transformer ", this voltage transformer includes pressure vessel, Primary Conductor it is provided with from the inside to the outside in pressure vessel, suspension cylinder, the first metal layer, second metal level and the 3rd metal level, the first metal layer is attached on suspension electrode, second metal level includes the low-field electrode of two tile structures, each low-field electrode is along the circumferentially-spaced layout of Primary Conductor, in being respectively arranged with between the first metal layer and the second metal level and between the second metal level and the 3rd metal level, external insulation dielectric layer.This voltage transformer uses capacitance partial pressure structure; use Primary Conductor and suspension cylinder as high-voltage capacitance; with the coaxial metal Rotating fields separated that insulate as low-voltage capacitance; low-voltage capacitance side upper resistance introduce harvester; integrated, amplify, double A/D conversion after, be converted into optical signal by photoelectric conversion device and measure on protection equipment after intelligent acess combining unit synchronization process.The existence of existing this stagewise voltage transformer is haveing a problem in that: the surfaces externally and internally at an insulating medium layer arranges the technique of metal level and is easier to realize, but metal level, insulating medium layer, metal level, insulating medium layer, metal level be this, and to be close to arrange technique continuously relatively difficult to achieve, processing technique requires height, being not easily accomplished, cost is of a relatively high.

Summary of the invention

The purpose of this utility model is to provide a kind of stagewise voltage transformer, and to solve metal level in prior art, insulating medium layer, metal level, insulating medium layer, this structure that arranges continuously of metal level require higher problem to processing technique.

In order to solve the problems referred to above, the technical scheme is that

A kind of stagewise voltage transformer, including the interior insulating medium layer being coaxially set and external insulation dielectric layer, the inner surface of interior insulating medium layer has been sticked the first metal layer, the outer surface of interior insulating medium layer has been sticked the second metal level, the inner surface of external insulation dielectric layer is sticked the 3rd metal level being located at interval at outside the second metal level, the outer surface of external insulation dielectric layer has been sticked the 4th metal level, second metal level includes low-field electrode inside at least one, 3rd metal level includes and inner side low-field electrode number outside low pressure electrode one to one, inner side low-field electrode and corresponding outside low pressure electrode short circuit.

Gap between second metal level and the 3rd metal level is filled with insulating cement.

The inner coaxial line of the first metal layer has been sticked floating potential cylinder, and the inner coaxial line of floating potential cylinder is provided with Primary Conductor.

First, second, third and fourth metal level is copper foil layer.

Inner side low-field electrode has at least two, inner side low-field electrode is the tile structure being coaxially set with interior insulating medium layer, outside low pressure electrode is the tile structure being coaxially set with external insulation dielectric layer, each inner side low-field electrode being provided at circumferentially spaced along interior insulating medium layer, the gap between adjacent inboard low-field electrode is the most corresponding along the gap between the radial direction and corresponding adjacent outer low-field electrode of interior insulating medium layer.

The beneficial effects of the utility model are: the first metal layer in the present invention, second metal level is attached at the interior of interior insulating medium layer respectively, on outer surface, 3rd metal level, 4th metal level is attached at the interior of external insulation dielectric layer respectively, on outer surface, second metal level and the 3rd metal interlevel are every setting, make the first metal layer, interior insulating medium layer and the second metal level constitute a unit, 3rd metal level, external insulation dielectric layer and the 4th metal level also constitute a unit, each unit is all easy to processing, simplify product processing technique, reduce the cost of manufacture of product.

Accompanying drawing explanation

Fig. 1 is the structural representation of an embodiment of the present utility model；

Fig. 2 is that the A-A of Fig. 1 is to sectional view；

Fig. 3 is the cooperation schematic diagram of inside and outside insulating medium layer and corresponding metal level in Fig. 2；

Fig. 4 is the electrical schematic diagram of Fig. 2.

Detailed description of the invention

The embodiment of a kind of stagewise voltage transformer is as shown in figures 1-4: include pressure vessel 10, Primary Conductor 1 it is provided with in pressure vessel 10, the outside of Primary Conductor has been coaxially set floating potential cylinder 2, interior insulating medium layer 4 and external insulation dielectric layer 8, the inner surface of interior insulating medium layer 4 has been sticked the first metal layer 3, floating potential cylinder provides mechanical support for each metal level, the inner surface of the first metal layer 3 is attached on floating potential cylinder 2, and the outer surface of interior insulating medium layer 4 is sticked the second metal level 5.The inner surface of external insulation dielectric layer 8 is sticked the 3rd metal level 7 being positioned at outside the second metal level, and the outer surface of external insulation dielectric layer has been sticked the 4th metal level 9, the 4th metal level 9 ground connection.Second metal level includes two inner side low-field electrodes, inner side low-field electrode is the tile structure being coaxially set with interior insulating medium layer, 3rd metal level includes and inner side low-field electrode number outside low pressure electrode one to one, outside low pressure electrode is the tile structure being coaxially set with external insulation dielectric layer, each inner side low-field electrode passes through electric conductor 11 short circuit with corresponding outside low pressure electrode respectively, and the gap 12 between adjacent inboard low-field electrode is the most corresponding along the gap 13 between the radial direction and adjacent outer low-field electrode of interior insulating medium layer.Being filled with insulating cement 6 between second metal level and the 3rd metal level, insulating cement can play the effect insulated from each other of adjacent inboard low-field electrode, adjacent outer low-field electrode, and insulating cement can also play the effect ensureing product bulk strength.In the present embodiment, each metal level is copper foil layer.

Using insulating gas (such as sulfur hexafluoride) insulation between Primary Conductor and floating potential cylinder, it forms therebetween high-voltage capacitance, undertakes Primary Conductor to pressure vessel earth potential pressure drop major part.Forming two-stage electric capacity between the first metal layer, the second metal level and between the 3rd metal level, the 4th metal level respectively, two-stage electric capacity is combined by insulating cement.On two-stage capacitance structure independently, processing technique is consistent, and inside and outside insulating medium layer is high tenacity, high insulating property ability.During use between outside low-field electrode and the 4th metal level build-out resistor in parallel, connect voltage acquisition unit by shielded cable, voltage acquisition unit is installed in the closing metal housing outside pressure vessel, can avoid the interference of external electromagnetic field.

As shown in Figure 4: Primary Conductor outer surface and floating potential cylinder are near Primary Conductor side surface capacitance parameter C₁, capacitance parameter C between the first metal layer 3 and second metal level 5 each inner side low-field electrode_2a, capacitance parameter C between the 4th metal level 9 and the 3rd metal level each outside low pressure electrode 7_2b, can draw according to coaxial capacitance computing formula, here is omitted.Build-out resistor R_pComputing formula is as follows:

$\frac{{\widetilde{\stackrel{\·}{U}}}_i}{{\widetilde{\stackrel{\·}{U}}}_o}=1+{\mathrm{\αC}}_{2b}-j\frac{\mathrm{\α}}{{\mathrm{wR}}_p}---\left(1\right)$

In formula:N is the number of inner side low-field electrode.

According to formula (1), it is known that output valve isBuild-out resistor R can be sought_p。

In other embodiments of the present utility model: the number of inner side low-field electrode can also is that one, three or other number；Also can insulate by filling insulating gas between second metal level and the 3rd metal level；Inner side low-field electrode, outside low pressure electrode can also is that the tubular construction being coaxially set with corresponding insulating medium layer, and the most each low-field electrode is axially spaced apart.

Claims (5)

1. a stagewise voltage transformer, including the interior insulating medium layer being coaxially set and external insulation dielectric layer, it is characterized in that: the inner surface of interior insulating medium layer has been sticked the first metal layer, the outer surface of interior insulating medium layer has been sticked the second metal level, the inner surface of external insulation dielectric layer is sticked the 3rd metal level being located at interval at outside the second metal level, the outer surface of external insulation dielectric layer has been sticked the 4th metal level, second metal level includes low-field electrode inside at least one, 3rd metal level includes and inner side low-field electrode number outside low pressure electrode one to one, inner side low-field electrode and corresponding outside low pressure electrode short circuit.

Stagewise voltage transformer the most according to claim 1, it is characterised in that: the gap between the second metal level and the 3rd metal level is filled with insulating cement.

Stagewise voltage transformer the most according to claim 1, it is characterised in that: the inner coaxial line of the first metal layer has been sticked floating potential cylinder, and the inner coaxial line of floating potential cylinder is provided with Primary Conductor.

Stagewise voltage transformer the most according to claim 1, it is characterised in that: first, second, third and fourth metal level is copper foil layer.

5. according to the stagewise voltage transformer described in Claims 1 to 4 any one, it is characterized in that: inner side low-field electrode has at least two, inner side low-field electrode is the tile structure being coaxially set with interior insulating medium layer, outside low pressure electrode is the tile structure being coaxially set with external insulation dielectric layer, each inner side low-field electrode being provided at circumferentially spaced along interior insulating medium layer, the gap between adjacent inboard low-field electrode is the most corresponding along the gap between the radial direction and corresponding adjacent outer low-field electrode of interior insulating medium layer.