CN203774078U - Multiple output electronic type current and voltage combined mutual inductor used for GIS (Gas Insulated Switchgear) - Google Patents

Abstract

The utility model relates to a multiple output electronic type current and voltage combined mutual inductor used for a GIS (Gas Insulated Switchgear). The multiple output electronic type current and voltage combined mutual inductor used for the GIS comprises an electronic current transformer and a coaxial capacitive voltage transformer, wherein the voltage transformer comprises a coaxial capacitive voltage divider; the coaxial capacitive voltage divider comprises a suspension electric potential barrel (6) and a low-voltage capacitance structure which is arranged on the outer side of the suspension electric potential barrel; the coaxial capacitive voltage divider is characterized in that the low-voltage capacitance structure is at least provided with a first metal layer (7), a second metal layer (9) and a third metal layer (11) from inside to outside in sequence; insulating media are arranged between the metal layers; the first metal layer (7) is connected to the outer wall of the suspension electric potential barrel (6); the second metal layer (9) is of a split structure. The multiple output and multiple protection functions of voltage and current sensing are realized by the voltage divider with a coaxial structure, and the multiple output electronic type current and voltage combined mutual inductor used for the GIS has the advantages of miniaturization, high anti-interference, high precision, high reliability, low cost and the like.

Description

Many output electronic current-voltage combination transformers for GIS

Technical field

The utility model relates to many output electronic current-voltage combination transformers for a kind of GIS.

Background technology

Current electronic type voltage transformer for GIS (comprising the voltage transformer 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 dielectric 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 insulating barrier 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 power system is to large capacity, and superhigh pressure and ultra 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 combination transformer of many outputs badly.

Utility model content

The purpose of this utility model is to provide many output electronic current-voltage combination transformers for a kind of GIS, in order to solve the current problem that there is no to export combination transformer more.

For achieving the above object, scheme of the present utility model comprises:

Many output electronic current-voltage combination transformers for a kind of GIS, comprise the voltage transformer of electronic current mutual inductor and coaxial capacitance formula, described voltage transformer 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 dielectric; 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 made up 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 of described voltage transformer.

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

Described electronic current mutual inductor comprises at least two Luo-coils, and Luo-coil is arranged in the metal shell outside floating potential cylinder.

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; formed by some split blocks; 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 port by shielded type cable with each split block; each split block and the 3rd metal interlevel are as a sensing head interface, thereby realize, voltage transformer is exported more, many defencive functions.Defencive functions as two in dual output.

By the Luo-coil of configuration suitable number, also can realize the function more current sense is exported, protected more.

The concrete miniaturization of combination transformer of the present utility model, high anti-interference, high accuracy, the advantages such as high reliability, low cost.

Brief description of the drawings

Fig. 1 is GIS electronic current voltage combination transformer overall structure figure;

Fig. 2 is instrument transformer 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 utility model is described in more detail.

Be illustrated in figure 1 the utility model many output electronic current-voltage combination transformers for a kind of GIS, comprise metal housing 5 processed, the coaxial capacitive voltage divider 3 etc. of outer pressure vessel 1, Luo-coil 4, Luo-coil, 2 is Primary Conductor.Similarly to the prior art, coaxial capacitive voltage divider is made up 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 execution mode, as shown in Figure 3, the second metal level 9 radial segments, are made up 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 execution mode, the second metal level 9 axial segmentation settings, can be divided into multiple tubular constructions (accompanying drawing does not draw).

As further execution mode, 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 instrument transformer output port, conduct to collecting unit via high shielding properties cable, 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 dielectric 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 outer surface capacity effect, collaborative the first metal layer, the second metal level, the 3rd metal interlevel capacity effect, form capacitor voltage divider, build-out resistor in parallel between the first metal layer and the 3rd metal level, regulate instrument transformer 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.

In order to realize many outputs of current transformer, can configure the Luo-coil of respective numbers, each Luo-coil forms respectively current sensor interface.Luo-coil is installed in aluminum or other metal housings, and housing, Luo-coil are coaxial with above-mentioned metal level.

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

Primary Conductor outer surface and floating potential cylinder are C near Primary Conductor side surface capacitance parameter ₁its capacitance values is decided by the dielectric constant 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:

$c_1=\frac{{2\mathrm{\π\ϵ}}_o{\mathrm{\ϵ}}_{r}l}{\ln \frac{b}{a}}---\left(1\right)$

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

In formula: ε ₀the dielectric constant of relative vacuum; ε _rdielectric constant; 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)

$\frac{\stackrel{\·}{U_i}}{{\stackrel{\·}{U}}_o}=\frac{1}{\mathrm{\α}}\×(\frac{C_x}{C_1}+1)-j\×\frac{1}{\mathrm{\ω\α}{C}_1{R}_p}---\left(2\right)$

In formula

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

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

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 execution mode and principle are introduced, the metal level of coaxial capacitive voltage divider is three layers, as other execution modes, also can be set to more than four layers or four layers, and those skilled in the art can select to arrange instrument transformer lead-out terminal as required.

Thus, only provided several concrete execution modes above, but the utility model is not limited to described execution mode.Basic ideas of the present utility model are such scheme, and for those of ordinary skill in the art, according to instruction of the present utility model, structure, the parameter of designing various distortion do not need to spend creative work.Variation, amendment, replacement and the modification of in the situation that not departing from principle of the present utility model and spirit, execution mode being carried out still fall in protection range of the present utility model.

Claims (8)

1. many output electronic current-voltage combination transformers for GIS, comprise the voltage transformer of electronic current mutual inductor and coaxial capacitance formula, described voltage transformer 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 dielectric; 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 current-voltage combination transformers for a kind of GIS according to claim 1, is characterized in that, described the second metal level (9) radial segments, is made up of at least two watts of shape structures.

3. many output electronic current-voltage combination 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 current-voltage combination 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 current-voltage combination 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 of described voltage transformer.

6. according to many output electronic current-voltage combination 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 current-voltage combination transformers for a kind of GIS described in claim 1 or 2 or 3 or 4, it is characterized in that, described electronic current mutual inductor comprises at least two Luo-coils, and Luo-coil is arranged in the metal shell outside floating potential cylinder.

8. according to many output electronic current-voltage combination 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.