CN205248100U - Electronic -type current -voltage -combined transformer for GIS (gas insulated switchgear) - Google Patents

Abstract

The utility model relates to an electronic -type current -voltage -combined transformer for GIS (gas insulated switchgear), including pressure vessel, in the pressure vessel from interior to exterior in proper order the coaxial line be provided with a partial conductor, suspension electrode and the first metal layer, the first metal layer includes two at least insulating low -field electrodes each other, is provided with the insulating cylinder between each low -field electrode and the suspension electrode, the periphery of each low -field electrode expose in in the pressure vessel, has the space that is used for filling the insulating gas between each low -field electrode and the pressure vessel. The utility model provides a need set up special -shaped insulator among the prior art and lead to the problem that whole current -voltage combined mutual inductor structure is complicated.

Description

A kind of GIS electronic current-voltage combination transformer

Technical field

The utility model relates to GIS electronic current-voltage combination transformer.

Background technology

Current GIS mostly is coaxial capacitance partial-pressure structure with electronic current-voltage combination transformer. as disclosed in Chinese patent CN203772925U " many output electronic type voltage transformers for GIS ", comprise the Primary Conductor being coaxially set successively from the inside to the outside, suspension electrode, the second metal level and the 3rd metal level, suspension electrode comprises floating potential cylinder and is attached at the first metal layer of floating potential cylinder periphery, the second metal level is made up of two low-field electrodes insulated from each other, each low-field electrode is the tile structure that axis extends along the vertical direction, each low-field electrode is arranged along the circumferential interval of Primary Conductor, each low-field electrode and the 3rd metal level, between the first metal layer and adjacent two low-field electrodes, be provided with insulator. insulating gas insulation between Primary Conductor and floating potential cylinder, thus high-voltage capacitance formed. the problem that existing this electronic type voltage transformer exists is: the insulation between each low-field electrode and the 3rd metal level, the first metal layer is more difficult, need the insulator of design polymorphic structure, insulator comprises primary insulation body, outer insulator and is connected in the connection insulator between inside and outside layer insulator, this structure, to being processed with higher requirement, is not suitable with fast-developing market environment.

Utility model content

The purpose of this utility model is to provide a kind of GIS electronic current-voltage combination transformer, needs to arrange special-shaped insulator and causes the baroque problem of whole current/voltage combination transformer to solve in prior art.

In order to address the above problem, the technical solution of the utility model is:

GIS electronic current-voltage combination transformer, comprise pressure vessel, once conductor, suspension electrode and the first metal layer from the inside to the outside are successively coaxially set in pressure vessel, the first metal layer comprises at least two low-field electrodes insulated from each other, between each low-field electrode and suspension electrode, be provided with insulating cylinder, the periphery of each low-field electrode is exposed in described pressure vessel, has the space for filling insulating gas between each low-field electrode and pressure vessel.

Insulating cylinder is the structure such as wall thickness such as grade being coaxially set with Primary Conductor, between adjacent two low-field electrodes, is provided with the bar shaped insulator being fixedly arranged on described insulating cylinder.

Suspension electrode is made up of floating potential cylinder and the second metal level of being attached at floating potential cylinder periphery.

The second metal level is the C shape structure with opening.

Wherein at least two low-field electrodes are the tile electrode being coaxially set with Primary Conductor, each tile electrode is along the circumferential interval layout of Primary Conductor, and one of them adjacent two interelectrode gap of tile is radially just corresponding with the opening of described the second metal level along Primary Conductor.

In each low-field electrode, wherein at least two low-field electrodes are the tile electrode being coaxially set with Primary Conductor, each tile electrode arranges along the circumferential interval of Primary Conductor, all the other low-field electrodes are the cylindrical electrode being coaxially set with Primary Conductor, and cylindrical electrode and tile electrode are in the axially spaced-apart setting of Primary Conductor.

The axial length of cylindrical electrode is longer than the axial length of tile electrode, and cylindrical electrode is for directly grounded earth electrode, and tile electrode is output electrode.

The beneficial effects of the utility model are: in the utility model, save the 3rd metal-layer structure of the prior art, each low-field electrode is exposed in pressure vessel, therefore only need between low-field electrode and suspension electrode, insulating cylinder be set, can insulate by insulating gas in the outside of low-field electrode, simplify the design of insulation system, the complex structure degree that has reduced whole product, is easy to production and processing.

Brief description of the drawings

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

Fig. 2 is the layout schematic diagram of pressure vessel in the utility model, the first metal layer, suspension electrode and Primary Conductor;

Fig. 3 is suspension electrode in Fig. 2, insulating cylinder and the schematic diagram that coordinates of the first metal layer;

Fig. 4 is the electrical schematic diagram of Fig. 1;

Fig. 5 is the expanded view of the first metal layer in Fig. 2.

Detailed description of the invention

GIS with the embodiment of electronic current-voltage combination transformer as shown in Fig. 1～5: comprise pressure vessel 1, pressure vessel is interior by the once conductor 2 that is coaxially set successively outside interior, suspension electrode and the first metal layer 9, the second metal level 7 that suspension electrode has floating potential cylinder 6 and is attached at floating potential cylinder 6 peripheries forms, floating potential cylinder provides mechanical support for the second metal level, the second metal level 7 is for having the C shape structure of opening 12, this is because the second metal level is to be rolled and formed by metallic plate, due to size computational problem, the situation that there will be the second metal level not form enclosed construction occurs. the first metal layer comprises three low-field electrodes insulated from each other, wherein two low-field electrodes are the tile electrode being coaxially set with Primary Conductor, each tile electrode is along the circumferential interval layout of Primary Conductor, and one of them adjacent two interelectrode gap of tile is radially positive corresponding with the opening 12 of the second metal level along Primary Conductor. all the other low-field electrodes are the cylindrical electrode being coaxially set with Primary Conductor, cylindrical electrode and tile electrode are in the axially spaced-apart setting of Primary Conductor, the axial length of cylindrical electrode is longer than the axial length of tile electrode, cylindrical electrode is for directly grounded earth electrode, and tile electrode is output electrode. the insulating cylinder 8 of wall thickness structure such as between low-field electrode and the second metal level, be provided with, between adjacent two low-field electrodes, be provided with the bar shaped insulator 13 being fixedly arranged on insulating cylinder, the periphery of each low-field electrode is exposed in pressure vessel, has the space for filling insulating gas between each low-field electrode and pressure vessel. the periphery of low-field electrode is provided with current transformer housing 5, is provided with Luo-coil 4 between current transformer housing and low-field electrode.

The direct ground connection of earth electrode when use, can reduce like this impact of transient voltage on output electrode place circuit, the size of earth electrode is larger, can realize like this dividing potential drop effect in lightning impulse test, reduces the impact of these lightning impulse tests on other circuit. One of them adjacent two interelectrode gap of tile is radially just corresponding with the opening of the second metal level along Primary Conductor, can avoid like this waste of tile electrode.

Be below capacitance-resistance voltage division principle, as shown in Fig. 3～5: Primary Conductor outer surface and floating potential cylinder are C near Primary Conductor side surface capacitance parameter₁Its capacitance values is determined by the dielectric constant of gas medium between Primary Conductor and floating potential cylinder and concrete appearance and size, the relative position of Primary Conductor and floating potential cylinder, floating potential tube outer surface and the second metal level are close to, and the capacitance parameter between a metal level on the second metal level and the first metal layer, b metal level, c metal level is respectively C₂、C₃、C₄, a metal level and b metal level refer to tile electrode, and c metal level refers to cylindrical electrode. Under ideal conditions, endless coaxial capacitance computing formula is:

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

In order to calculate C₂、C₃、C₄。

In formula: ε₀For gas-insulated medium (SF6) is with respect to the dielectric constant of vacuum; ε r is dielectric constant; L is capacitance plate length; A is paraxial side metal level radius; B axle side far away metal level radius, a metal level, b metal level electric parameter are identical, C₂＝C₄，R₁＝R₂。

Known according to electrical schematic diagram (Fig. 3):

$\frac{\stackrel{\·}{U_i}}{\stackrel{\·}{U_{o1}}}=\frac{\stackrel{\·}{U_i}}{\stackrel{\·}{U_{o2}}}=1+\frac{C_3}{C_1}+\frac{2C_2+C_1+C_3}{{\mathrm{j\ωR}}_1{C}_1{C}_2}---\left(2\right)$

In formula, C₂、C₃、C₄Be capacitance parameter between the every independent metal level of the second metal level and the first metal layer, all can obtain according to physical dimension, output valve isBuild-out resistor R₁、R₂Can ask.

In other embodiment of the present utility model: tile electrode can also have three, four or other number; Cylindrical electrode can be also two, three or more; Between adjacent low-field electrode, also can insulate by insulating gas; Floating potential cylinder and the second metal level can also be wholely set; According to electric capacity needs, the axial length of cylindrical electrode also can be no longer than the axial length of tile electrode.

Claims (7)

1.GIS electronic current-voltage combination transformer, comprises pressure vessel, in pressure vessel from the inside to the outsideBe coaxially set successively once conductor, suspension electrode and the first metal layer, the first metal layer comprise at least two thatThe low-field electrode of this insulation, is characterized in that: between each low-field electrode and suspension electrode, be provided with insulating cylinder, and each lowThe periphery of the piezoelectricity utmost point is exposed in described pressure vessel, has for filling absolutely between each low-field electrode and pressure vesselThe space of edge gas.

2. GIS electronic current-voltage combination transformer according to claim 1, is characterized in that:Insulating cylinder is the structure such as wall thickness such as grade being coaxially set with Primary Conductor, between adjacent two low-field electrodes, is provided with and sets firmlyBar shaped insulator on described insulating cylinder.

3. GIS electronic current-voltage combination transformer according to claim 1, is characterized in that:Suspension electrode is made up of floating potential cylinder and the second metal level of being attached at floating potential cylinder periphery.

4. GIS electronic current-voltage combination transformer according to claim 3, is characterized in that:The second metal level is the C shape structure with opening.

5. GIS electronic current-voltage combination transformer according to claim 4, is characterized in that:Wherein at least two low-field electrodes are the tile electrode being coaxially set with Primary Conductor, and each tile electrode is along oneThe circumferential interval layout of partial conductor, one of them adjacent two interelectrode gap of tile along Primary Conductor radiallyJust corresponding with the opening of described the second metal level.

6. according to the GIS electronic current-voltage combination transformer described in claim 1～4 any one, itsBe characterised in that: in each low-field electrode, wherein at least two low-field electrodes are the tile being coaxially set with Primary ConductorElectrode, each tile electrode arranges along the circumferential interval of Primary Conductor, and all the other low-field electrodes are coaxial with Primary ConductorThe cylindrical electrode that line arranges, cylindrical electrode and tile electrode are in the axially spaced-apart setting of Primary Conductor.

7. GIS electronic current-voltage combination transformer according to claim 6, is characterized in that:The axial length of cylindrical electrode is longer than the axial length of tile electrode, and cylindrical electrode is for directly grounded ground connectionElectrode, tile electrode is output electrode.