CN103760395A - Multiple-output electronic voltage transformer for GIS - Google Patents

Abstract

The invention relates to a multiple-output electronic voltage transformer for a GIS. The multiple-output electronic voltage transformer for the GIS comprises a coaxial capacitive voltage divider which comprises a suspended potential cylinder (6) and a low-voltage capacitor structure which is arranged on the outer side of the suspended potential cylinder (6). The multiple-output electronic voltage transformer for the GIS is characterized in that the low-voltage capacitor structure is at least sequentially provided with a first metal layer (7), a second metal layer (9) and a third metal layer (11) from inside to outside, insulation media are arranged between the metal layers, the first metal layer (7) is connected with the outer wall of the suspended potential cylinder (6), and the second metal layer (9) is in a split type structure. The coaxial structure voltage divider can achieve the functions of multiple output and multi-protection of sensing of voltages and currents. The multiple-output electronic voltage transformer for the GIS has the advantages of miniaturization, high anti-interference, high precision, high reliability, low cost and the like.

Description

Many output electronic type voltage transformers for a kind of GIS

Technical field

The present invention relates to many output electronic type voltage transformers for a kind of GIS.

Background technology

Current electronic type voltage transformer for GIS (comprising the voltage transformer (VT) in combination transformer equipment); mostly be capacitance partial pressure structure; use the coaxial configuration of primary shielding cover and suspension cylindrical shell as high-voltage capacitance; by the coaxial metal layer structure of insulating medium as low-voltage capacitance; low-voltage capacitance side upper resistance introduces collector, after integration, amplification, double A/D conversion, by photoelectric conversion device be converted into light signal after synchronous processing of optical fiber access merge cells to measuring and protecting equipment.

As CN202384167U, the patent documentations such as CN202384166U are disclosed, and on the floating potential cylinder of the coaxial setting of Primary Conductor, metal level and insulation course are set, and form coaxial capacitance structure.For combination transformer, the current transformer that adopts Luo-coil is coaxially set on floating potential cylinder.

Current problem is, along with electric system is to large capacity, and UHV (ultra-high voltage) and extra-high voltage future development, to power equipment miniaturization, intellectuality, the requirement of high reliability is also more and more higher, and national grid has proposed the principle of two protections to the above power station of intelligent grid 110KV level measuring system; So need a kind of voltage transformer (VT) of many outputs badly.

Summary of the invention

The object of this invention is to provide many output electronic type voltage transformers for a kind of GIS, in order to solve the current problem that there is no multi-output voltages mutual inductor.

For achieving the above object, the solution of the present invention comprises:

Many output electronic type voltage transformers for a kind of GIS, voltage transformer (VT) comprises coaxial capacitive voltage divider, coaxial capacitive voltage divider comprises the low-voltage capacitance structure of floating potential cylinder (6) and floating potential cylinder arranged outside, described low-voltage capacitance structure is provided with the first metal layer (7), the second metal level (9) and the 3rd metal level (11) at least from inside to outside successively, between each metal level, is provided with insulating medium; Described the first metal layer (7) connects floating potential cylinder (6) outer wall, and the second metal level (9) is split-type structural.

Described the second metal level (9) radial segments, is comprised of at least two watts of shape structures.

Described the second metal level (9) axial segmentation setting.

Described the second metal level (9) axial segmentation setting.

Described the 3rd metal level (11) ground connection, each split block of the second metal level connects respectively the corresponding output terminal of described voltage transformer (VT).

Each split block size of described the second metal level (9), shape are identical.

Between described the first metal layer and the 3rd metal level, be parallel with build-out resistor.

Coaxial capacitive voltage divider comprises floating potential cylinder, and floating potential cylinder coaxially at least arranges the first metal layer 7, the second metal level 9, the three metal levels 11 from inside to outside.By adjusting the second metal level 9 shapes, structure; be set to split-type structural; by some split blocks, formed; splitting method comprises axial segmentation; be divided into some tubular constructions; or radial segments; be divided into some watts of shape structures; or be not only axial segmentation but also radial segments; the 3rd metal level is all connected corresponding voltage transformer (VT) port by shielded cable with each split block; each split block and the 3rd metal interlevel are as a sensing head interface, thereby realize, voltage transformer (VT) is exported more, many defencive functions.Defencive functions as two in dual output.

Mutual induction of voltage implement body of the present invention miniaturization, high anti-interference, high precision, the advantages such as high reliability, low cost.

Accompanying drawing explanation

Fig. 1 is GIS electronic type voltage transformer one-piece construction figure;

Fig. 2 is mutual inductor low-voltage capacitance metal layering schematic diagram;

Fig. 3 is coaxial capacitance mechanism principle figure;

Fig. 4 is capacitance-resistance dividing potential drop electrical schematic diagram.

Embodiment

Below in conjunction with accompanying drawing, the present invention will be further described in detail.

Be illustrated in figure 1 the present invention many output electronic type voltage transformers for a kind of GIS, comprise outer pressure vessel 1, coaxial capacitive voltage divider 3 etc., 2 is Primary Conductor.Similarly to the prior art, coaxial capacitive voltage divider is comprised of the low-voltage capacitance structure in floating potential cylinder and floating potential cylinder outside, between Primary Conductor 2 and floating potential cylinder 6, adopts gas-insulated medium (SF ₆) insulation, form high-voltage capacitance.

As shown in Figure 2, floating potential cylinder outside, is coaxially arranged with the first metal layer 7, the first solid dielectric insulation layer 8, the second metal level 9, the second solid dielectric insulation layer 10 and the 3rd metal level 11 from inside to outside successively; The first metal layer 7 is close to floating potential cylinder 6 outer walls, and the second metal level 9 is split-type structural.

Above-mentioned split-type structural, as a kind of embodiment, as shown in Figure 3, the second metal level 9 radial segments, are comprised of two watts of shape structures.In order to realize many output, also can adopt three or three the second metal levels that above watt shape structure forms.First, second solid dielectric insulation layer that is filled into the solid insulating material formation of metal interlevel is communicated with by the gap between the second metal level split block.

As another kind of embodiment, the second metal level 9 axial segmentation settings, can be divided into multiple tubular constructions (accompanying drawing does not draw).

As further embodiment, the second metal level 9 not only axial segmentation but also radial segments, its cross section still can be with reference to Fig. 3.

In above embodiment, for the ease of measuring, calculating, each split block size, shape are identical, in the electrical parameter calculation of Fig. 4, select two Split type structures, and two split block electric parameters are identical.

The every split block of the second metal level and the 3rd metal level form mutual inductor output port, via high shielding properties cable, conduct to collecting unit, thereby realize the many protections of many output.The 3rd metal level is ground metal layer.

Floating potential cylinder is fixed on pressure container cylinder, between floating potential cylinder and pressure vessel, adopt high strength high insulation engineering plastics to be connected, the first metal layer and the second metal interlevel, the second metal level and the 3rd metal interlevel adopt high tenacity, high insulating property filling insulating material.Floating potential cylinder is installed on pressure container cylinder, the first metal layer, the second metal level, the 3rd metal level and relevant insulating medium are installed and are attached on floating potential cylinder, and floating potential cylinder provides mechanical support for the first metal layer, the second metal level, the 3rd metal level.Metal pressing pressure container forms external electric field shielding harness, floating potential cylinder forms strong and weak electricity field shield system, simultaneously, floating potential cylinder is born Primary Conductor to pressure vessel earth potential pressure drop major part near Primary Conductor side surface and Primary Conductor outside surface capacity effect, collaborative the first metal layer, the second metal level, the 3rd metal interlevel capacity effect, form capacitive divider, build-out resistor in parallel between the first metal layer and the 3rd metal level, regulate mutual inductor output port output voltage, form Overvoltage suppressing circuit simultaneously.

Secondary electron unit, the above part of pressure vessel that cable connects as shown in Figure 1, is installed on pressure vessel outside, is installed in closed metal housing processed.For secondary electron unit provides good external electromagnetic field shield.Collecting unit input port large resistance are guaranteed progress of disease precision.

Be below capacitance-resistance voltage division principle, as shown in Figure 4:

Primary Conductor outside surface and floating potential cylinder are C near Primary Conductor side surface capacitance parameter ₁its capacitance values is decided by the specific inductive capacity of gas medium between Primary Conductor and floating potential cylinder and the concrete shape of Primary Conductor and floating potential pipe, floating potential tube outer surface and the first metal layer are close to, and between the first metal layer and the each split block of the second metal level, capacitance parameter is C _a, the each split block of the second metal level and the 3rd metal interlevel capacitance parameter are C2, from metal-layer structure, between the first metal layer and the each split block of the second metal level, electric capacity can be considered n C _aparallel connection, the each split block of the second metal level and the 3rd metal interlevel electric capacity can be considered n C ₂in parallel.Ignore many details factors, can idealizedly be considered as endless coaxial capacitance computing formula and be:

${\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="HDA0000452629800000021.png"\; state="\{\{state\}\}">c</figure-callout>}}_1=\frac{2\mathrm{\&pi;}{\mathrm{\&epsiv;}}_o{\mathrm{\&epsiv;}}_{r}l}{\ln \frac{b}{a}}---\left(1\right)$

In order to calculate C ₁, C _a, C ₂equivalent.

In formula: ε ₀the specific inductive capacity of relative vacuum; ε _rspecific inductive capacity; L capacitance plate length; The coaxial paraxial side metal level radius of a; The coaxial axle side metal level radius far away of b.Between the first metal layer and the each split block of the second metal level, electric capacity, the each split block of the second metal level and the 3rd metal interlevel electric capacity are equal score value after the second metal level and this metal level electric capacity calculate.According to electrical schematic diagram (Fig. 3)

$\frac{{\stackrel{\&CenterDot;}{U}}_i}{{\stackrel{\&CenterDot;}{U}}_o}=\frac{1}{\mathrm{\&alpha;}}\&times;(\frac{C_x}{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA0000452629800000021.png"\; state="\{\{state\}\}">C</figure-callout>}}_1}+1)-j\&times;\frac{1}{\mathrm{\&omega;\&alpha;}{C}_1{R}_p}---\left(2\right)$

In formula

$\mathrm{\&alpha;}=\frac{C_a}{C_a+C_2}---\left(3\right)$

$C_x=n\&times;\frac{C_a\&times;C_2}{C_a+C_2}---\left(4\right)$

N is the second metal level split block number, C _afor capacitance parameter between the first metal layer and the every split block of the second metal level, C ₂be the every split block of the second metal level and the 3rd metal level electric capacity, C _a, C ₁, C ₂all can obtain according to physical dimension, output valve is

build-out resistor R=R ' can ask.

During above embodiment and principle are introduced, the metal level of coaxial capacitive voltage divider is three layers, as other embodiments, also can be set to more than four layers or four layers, and those skilled in the art can select to arrange mutual inductor lead-out terminal as required.

Thus, only provided several concrete embodiments above, but the present invention is not limited to described embodiment.Basic ideas of the present invention are such scheme, and for those of ordinary skills, according to instruction of the present invention, structure, the parameter of designing various distortion do not need to spend creative work.Variation, modification, replacement and the modification of without departing from the principles and spirit of the present invention embodiment being carried out still fall within the scope of protection of the present invention.

Claims (7)

1. many output electronic type voltage transformers for GIS, voltage transformer (VT) comprises coaxial capacitive voltage divider, coaxial capacitive voltage divider comprises the low-voltage capacitance structure of floating potential cylinder (6) and floating potential cylinder arranged outside, it is characterized in that, described low-voltage capacitance structure is provided with the first metal layer (7), the second metal level (9) and the 3rd metal level (11) at least from inside to outside successively, between each metal level, is provided with insulating medium; Described the first metal layer (7) connects floating potential cylinder (6) outer wall, and the second metal level (9) is split-type structural.

2. many output electronic type voltage transformers for a kind of GIS according to claim 1, is characterized in that, described the second metal level (9) radial segments, is comprised of at least two watts of shape structures.

3. many output electronic type voltage transformers for a kind of GIS according to claim 1, is characterized in that described the second metal level (9) axial segmentation setting.

4. many output electronic type voltage transformers for a kind of GIS according to claim 2, is characterized in that described the second metal level (9) axial segmentation setting.

5. according to many output electronic type voltage transformers for a kind of GIS described in claim 1 or 2 or 3 or 4, it is characterized in that, described the 3rd metal level (11) ground connection, each split block of the second metal level connects respectively the corresponding output terminal of described voltage transformer (VT).

6. according to many output electronic type voltage transformers for a kind of GIS described in claim 1 or 2 or 3 or 4, it is characterized in that, each split block size of described the second metal level (9), shape are identical.

7. according to many output electronic type voltage transformers for a kind of GIS described in claim 1 or 2 or 3 or 4, it is characterized in that, between described the first metal layer and the 3rd metal level, be parallel with build-out resistor.

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