CN205404656U - Electronic voltage transformer for GIS - Google Patents

Abstract

The utility model relates to an electronic voltage transformer for GIS, 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 -voltage electrode each other, is provided with the insulating cylinder between each low -voltage electrode and the suspension electrode, each low -voltage electrode's periphery expose in in the pressure vessel, has the space that is used for filling the insulating gas between each low -voltage 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 voltage transformer structure is complicated.

Description

GIS electronic type voltage transformer

Technical field

This utility model relates to a kind of GIS electronic type voltage transformer.

Background technology

Current GIS electronic type voltage transformer (including the voltage transformer in combination transformer equipment) mostly is coaxial capacitance partial-pressure structure.As disclosed in Chinese patent CN203772925U " GIS multi output electronic type voltage transformer ", including the Primary Conductor that sequentially coaxially line is arranged from the inside to the outside, suspension electrode, second metal level and the 3rd metal level, suspension electrode includes floating potential cylinder and is attached at the first metal layer of floating potential cylinder periphery, second metal level is made up of two low-field electrodes insulated from each other, each low-field electrode is the tile like structure that axis is vertically extending, each low-field electrode is along the circumferentially-spaced layout of Primary Conductor, each low-field electrode and the 3rd metal level, it is provided with insulator between the first metal layer and adjacent two low-field electrodes.Insulating gas insulation between Primary Conductor and floating potential cylinder, thus forming high-voltage capacitance.Existing this electronic type voltage transformer there is a problem in that the insulation between each low-field electrode and the 3rd metal level, the first metal layer is more difficult, the insulator of polymorphic structure need to be designed, insulator includes inner insulator, outer insulator and the connection insulator being connected between inside and outside layer insulator, processing is had higher requirement by this structure, inadaptable fast-developing market environment.

Utility model content

The purpose of this utility model is in that to provide a kind of GIS electronic type voltage transformer, causes the baroque problem of whole voltage transformer to solve to need in prior art to arrange abnormity insulator.

In order to solve the problems referred to above, the technical solution of the utility model is:

A kind of GIS electronic type voltage transformer, including pressure vessel, in pressure vessel, sequentially coaxially line is provided with Primary Conductor, suspension electrode and the first metal layer from the inside to the outside, the first metal layer includes the low-field electrode that at least two is insulated from each other, it is provided with insulating cylinder between each low-field electrode and suspension electrode, 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 wall thickness structure such as grade being coaxially set with Primary Conductor, has the gap filled for described insulating gas and make described adjacent two low-field electrodes insulation between adjacent two low-field electrodes.

Suspension electrode is by floating potential cylinder and is attached at the second metal level of floating potential cylinder periphery and constitutes.

Each low-field electrode is the tile like structure being coaxially set with Primary Conductor, and each low-field electrode is along the circumferentially-spaced layout of Primary Conductor.

One of them low-field electrode is for directly grounded ground electrode, and remaining low-field electrode is output electrode.

The arc length of output electrode is more than the arc length of ground electrode.

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

Further, ground electrode is directly grounded, and so can reduce the transient voltage impact on output electrode place circuit.

Further, the arc length of ground electrode, more than the arc length of output electrode, so can be implemented in the dividing potential drop effect in lightning impulse test, reduces the impact on other circuit of these testing experiments.

Accompanying drawing explanation

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

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

Fig. 3 is that suspension electrode in Fig. 2, insulating cylinder coordinate schematic diagram with the first metal layer；

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

Fig. 5 is the electrical schematic diagram of embodiment 2 of the present utility model.

Detailed description of the invention

The embodiment 1 of GIS electronic type voltage transformer is as shown in figures 1-4: include pressure vessel 2, in pressure vessel 2, sequentially coaxially line is provided with Primary Conductor 1 from the inside to the outside, suspension electrode and the first metal layer, suspension electrode is by floating potential cylinder 5 and is attached at the second metal level 4 of floating potential cylinder periphery and constitutes, suspension electrode provides for metal level and supports, the first metal layer includes three low-field electrodes 3 insulated from each other, be provided with between each low-field electrode 3 and the second metal level 4 be coaxially set with Primary Conductor etc. the insulating cylinder 7 of wall thickness structure, there is between each low-field electrode and pressure vessel the space for filling insulating gas.Each low-field electrode is the tile like structure being coaxially set with Primary Conductor, and each low-field electrode, along the circumferentially-spaced layout of Primary Conductor, has the gap 6 filled for insulating gas and make adjacent two low-field electrodes insulation between adjacent two low-field electrodes.One of them low-field electrode is for directly grounded ground electrode, and remaining low-field electrode is the output electrode arranging resistance lead structure, and the arc length of ground electrode is more than the arc length of output electrode.Figure middle term 8 represents for the casing that secondary electron unit is installed.

Forming C1 between Primary Conductor and floating potential cylinder, form C3, form C2 and C4 between the second metal level and each output electrode of low-field electrode respectively between the second metal level and the ground electrode of low-field electrode, the arc length of wherein corresponding for C4 output electrode is longer.Each low-field electrode forms isolated island structure, draws multiple signals from low-field electrode, signal is defeated by by shielded cable the secondary electron unit being positioned within pressure vessel, outputs signal to intelligent cell after AD conversion.By changing the number of low-field electrode, it may be achieved voltage transformer multi output, many defencive functions.

Primary Conductor outer surface and floating potential cylinder are C near Primary Conductor side surface capacitance parameter₁, the appearance parameter between the output electrode of the second metal level and the first metal layer is C₂, C₄, and the capacitance parameter between the ground electrode of the first metal layer is C₃, can be calculated according to coaxial capacitance formula:

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

In formula: the dielectric constant of ε 0 relative vacuum；ε r dielectric constant；L capacitance plate length；A coaxial paraxial side metal level radius；B coaxial distal shaft side metal level radius.

By metal-layer structure it can be seen that the second metal level and the first metal layer interregional Capacitance parallel connection of each isolated island, series matching resistor between output port, according to electrical schematic diagram known (Fig. 4):

$\frac{{\stackrel{\·}{U}}_i}{\stackrel{.}{U_{o1}}}=\frac{{\stackrel{\·}{U}}_i}{\stackrel{.}{U_{o2}}}=1+\frac{C_3}{C_1}+\frac{2C_2+C_1+C_3}{{\mathrm{j\ωC}}_1{C}_2{R}_1}---\left(2\right)$

In formula, C₁For high-voltage capacitance, C₂, C₄For the electric capacity in the identical isolated island region of the first metal layer 2, C₃For the capacitance parameter in the first metal layer another one isolated island region, output valve isKnown output valveOrBuild-out resistor R₁=R₂Can ask.

In other embodiments of the present utility model: each low-field electrode can also be the tubular construction being coaxially set with Primary Conductor, now each low-field electrode can be arranged along the axially spaced-apart of Primary Conductor；Can also be insulated by insulator between low-field electrode；Ground electrode can also be identical with the arc length of each output electrode；Floating potential cylinder and the second metal level can also be wholely set.

The embodiment 2 of GIS electronic type voltage transformer is as shown in Figure 5: as different from Example 1, low-field electrode has multiple embodiment 2, forms C between the second metal level and each low-field electrode respectively₂～C_n。

Claims (5)

1. a GIS electronic type voltage transformer, including pressure vessel, in pressure vessel, sequentially coaxially line is provided with Primary Conductor from the inside to the outside, suspension electrode and the first metal layer, the first metal layer includes the low-field electrode that at least two is insulated from each other, it is characterized in that: 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, there is between each low-field electrode and pressure vessel the space for filling insulating gas, each low-field electrode is the tile like structure being coaxially set with Primary Conductor, each low-field electrode is along the circumferentially-spaced layout of Primary Conductor.

2. GIS electronic type voltage transformer according to claim 1, it is characterized in that: insulating cylinder is the wall thickness structure such as grade being coaxially set with Primary Conductor, there is between adjacent two low-field electrodes the gap filled for described insulating gas and make described adjacent two low-field electrodes insulation.

3. GIS electronic type voltage transformer according to claim 1, it is characterised in that: suspension electrode is by floating potential cylinder and is attached at the second metal level of floating potential cylinder periphery and constitutes.

4. GIS electronic type voltage transformer according to claim 1, it is characterised in that: one of them low-field electrode is for directly grounded ground electrode, and remaining low-field electrode is output electrode.

5. GIS electronic type voltage transformer according to claim 4, it is characterised in that: the arc length of output electrode is more than the arc length of ground electrode.