JPS5828667A - Measuring device for voltage - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises at least two resistors arranged in a line between a high voltage potential and ground and forming a voltage divider, the grounded resistor being a measuring resistor. high-voltage switch equipment, in which the high-voltage side resistor and the measuring resistor each consist of at least one resistive element consisting of an insulator and a resistive material mounted thereon; In particular, the present invention relates to a device for measuring high alternating voltages of sulfur 67 trouside gas insulated high voltage switch equipment enclosed in a metal box.

DE 2930672 covers a device of the type described above. There, the individual resistive wires are mounted on top of the resistive elements, and the individual resistive elements are assembled together in a 22, 2, 2, 4-way fashion to form the high-voltage or low-voltage side resistor of the voltage divider. Since the resistance element is formed into a disk shape,
Along with its outer diameter, the diameter of the surrounding ground metal case is also quite large. Furthermore, in the case of the device described in DE-A-2930672, capacitive control discs are required between the individual disc-shaped resistive elements for controlling the partial voltage during transient processes.

The object of the invention is therefore: - since the number of mineral elements is reduced compared to the device described in the above-mentioned West German Published Patent Application, a particularly simple construction results, on the other hand the overall dimensions are significantly reduced; The purpose of the present invention is to provide a device of the type mentioned above.

The above object is achieved by the present invention, in which the insulator is formed into a tubular shape,
A resistive material is disposed on the outside, and control of the transient voltage distribution is achieved by means of a single 7-domain control electrode.

Other preferred embodiments of the invention, in particular the arrangement of the insulating strips on the tubular insulator, are described in claims 2 to 6.
It is clear in section.

As the resistance material, a strip resistor, which is known per se, is used,
It is also possible to lay this on the outside of the insulator and to connect it there to one another by means of metal contact rings. A proposal for fixing a strip resistor is evident from the features of claim 9.

As the above-mentioned band-shaped resistor, a resistance element is used in which a thick-film resistance wire is attached to an elongated band-shaped ceramic body. Both ends of this thick film resistive wire are connected to contact surfaces mounted on a ceramic electrical board. In that case, the side or contact rings in the assembled state cover the contact surfaces of the strip resistors that are opposite each other or arranged in a row.

For the production of resistive strips, resistive pastes or thick-film resistive pastes consisting of fine resistive material, glass particles, organic carriers and additives are used. After applying the paste onto the substrate, i.e., an insulator or a ceramic body, the paste is heated to about 130°C.
and sintered at about 850°C to form a hard resistive material.

A particular advantage achieved with the design according to the invention is that the measuring device is particularly simple to construct with a small number of components, and the external diameter of the device is significantly reduced.

'A control electrode configured to equalize the electric field distribution along the surface of the tubular insulator with respect to the working frequency of the AC voltage to be measured on the high voltage line is provided for controlling the capacitive voltage distribution. It will be done. In this case, a hood-shaped metal or metallized plastic control electrode is used, which is mechanically and electrically coupled to the high-voltage line and whose length extends over the series circuit of the high- or low-voltage resistors. Preferably, it is at least partially covered. A control ring is attached to the low-voltage end of the 7-domain control electrode to reduce the electric field strength generated there. , 7-Do Control Electrode Co., Ltd., is provided with a through hole, such as a slit or an enlargement, in order to improve the dissipation of the lost heat converted in the high voltage side resistor. The external shape of the hood-shaped control electrode is designed so that the electric field strength distribution along the high-voltage side or linear voltage side resistor is close to a linear distribution at the operating frequency, and that the resistance element is The design is such that undesirable dielectric distortions are avoided.

The invention and other preferred embodiments and refinements of the invention will be explained and described in detail on the basis of the drawings which show some embodiments of the invention.

Please refer to Figure 1.

An equivalent circuit diagram of an enlarged device according to the invention is shown schematically therein.

The device according to the invention is housed in a grounded metal box 1o. The metal box 1o has seven flange 12 at its end, to which is connected a cover 14 which closes the free end of the metal box. A high voltage line 16 is observed inside the metal box.

The high voltage side resistor 18 is connected to the high voltage line 16, and the low voltage 9A
It is also connected to the enlarged ground side resistor 20. On the other hand, this resistor 20 itself is connected to ground, in this case to the cover 14 of the metal box.

Measuring line 22 between high side and low side resistor 18.20
is connected and leads to an amplifier 24.

The output signal of amplifier 24 is sent to measuring device 26 .

The return wire of the amplifier to ground is indicated by reference numeral 28.

The measurement line 22 is insulated with respect to the cover 14 and
It is inserted through the opening 30 of No. 4. In that case, the low voltage side resistor 2o is the measuring resistor.

In this way, the voltage drop across the measuring resistor is used for the measurement.

FIG. 2 shows a schematic diagram of the device according to the invention. A high voltage side resistor 18 is connected to the high voltage line 16 . A resistor aSS tubular insulator J2 is formed, and a resistive wire is mounted on top of the tubular insulator 32 (see FIGS. 4 to 10). A low voltage@measuring resistor 20 is connected to the high voltage llI resistor winding 18. The measuring resistor 20% also consists of a tubular insulator 34, on which is an insulator s2, i.e. similarly to the embodiment according to FIGS.
A resistance strip is attached.

Turtle conductive connection between resistor 61g and resistor 1ato metal plate J#
and is terminated with a measuring resistor SZa metal plate 38. Measurement line 22 1j to metal plate J# inside the expanded pipe Chichi S hoe body J4! The opening of the metal plate is 400 mm, which is pierced through the tubular insulator 3.4, and 1A is traced against the metal *XaK.
Penetrate and be guided. Also, metal @ss#i is grounded. The above-mentioned grounding is carried out by connecting the butterfly 1 and the metal gJJ to the cover 14 in the real am shown in FIG.

There is an amplifier 24 and a measuring device z6 outside the metal box.

An annular control electrode 44 is connected to the low voltage side end of the resistance: 1 szs, and a hood-shaped control electrode 46 is connected to this. 7-
A doped control electrode 46 is secured between the high voltage line 16 and the high side resistor 18, ie at reference numeral 48. The hood-shaped control electrode tapers into a truncated cone from the electrode 44 and connects to the resistor 18.
The frustoconical section 50, which transitions into a single half-shell 52 in the region of the high-pressure end of the section, is provided with an opening 5.4.

The opening 54 can be configured as a hole or a slit and is used for heat exhaustion. The control electrodes 44/46 are for equalizing the electric field strength, and this is especially true for the high voltage line 1.
6, the frequency used for the AC voltage to be measured is reached. At the same time, the control electrode largely compensates for the influence of stray capacitance between the resistor 18 and the metal box 10, so when a surge voltage occurs,
Excessive dielectric distortion of the high voltage am resistor 18 is avoided. Gas chamber insulating gas inside the metal box 10, for example 67,
It is filled with sulfur gas.

Figure 2 shows a configuration line single-phase metal box switch installation. Of course, it is also possible to apply the device of the present invention to three-phase metal box switch equipment. This application is illustrated in FIG. Three high-voltage wires R and S are installed inside a metal box 60 whose free end is closed with a cover 62.

T is provided and passed through the insulator 64. Insulator 64
can be used as a partition insulator, but at least as a support insulator. The measuring device according to FIG. 3 is connected both to the wire R and to the wires 8 and T (to show the commonality with the device according to FIG.
with the same reference number identified by °T). The amplifier that processes the signal of the measuring resistor 20B9208.20T is
It has reference number 66. The measuring device itself is not shown.

Both the high-voltage resistor 18 and the low-voltage resistor 20 can be constructed as shown in FIGS. 4 to 7. Insulator 32
Or, the resistance wire 70 is attached on top of 34 in a sushi shape,
Resistance threads 70 run parallel to the longitudinal axis 12 of the insulators 22/24 on the outer surface of the insulators.

In the embodiment according to FIG. 5, the resistance wires 74 run in a spiral pattern. In the configuration according to FIG. 6, the resistance wire 76 runs along the axis 12 of the insulator, and the resistance wire 18 runs with the longitudinal axis 78 intersecting the longitudinal axis 12, so that a type of resistance wire with series and parallel connections is formed. A cross-shaped grid is formed. A combination of the configuration shown in FIG. 5 and ta shown in FIG. 4, or the configuration shown in FIG. 5 combined with the configuration shown in FIG. 6 can be considered.

It is also conceivable to arrange two resistance strips according to FIG. 5, running in opposite directions, one on top of the other to form a type of cross-shaped lattice (stripes 77 and 19).

In Figures 8 and 9, the thick film resistive material is an insulator of 32"l.
or 34 as a homogeneous layer.

Since the thick film resistive material can be arranged on the insulator in the manner described above, it is possible to adjust the resistance value of the high voltage or extended ground side resistor over a wide range.

It is also possible to mount a strip resistor of the form shown in FIG. 10 on top of the insulator 32t or 34.

The strip resistor of FIG. 10 has a base body 80 of insulating material, particularly ceramics, on which is mounted a resistive strip 82 of thick film resistive paste.

The free ends of the resistive wires 82 are connected to conductive contact surfaces 84.86. In that case, the entire strip resistor has the reference number 88. In the embodiment of FIG. 8, a plurality of aligned rows of resistive wires 88 are mounted on insulator 32 or insulator 34 in a uniform distribution. In that case, each strip resistor 88
end at a distance from each other and are covered by a metal contact ring 90 such that the contact surfaces 84 and 86 of each of the two strip resistors 88 aligned opposite each other are connected through the contact ring 90. and are conductively coupled to each other. In this way, each row of strip resistors 88 and each strip resistor 88 in the same column are conductively coupled to each other. The contact ring 90 has a cylindrical inner WJ 92 and an arcuate or arcuate outer surface 94f to avoid widening corners.

FIG. 11 shows an embodiment of fixing a hood-shaped control electrode between the high voltage line 16 and the insulator 32' supporting the high voltage side resistor 18. In the illustrated embodiment, the high-voltage line 16 is provided with a bulge 100 which is used to define the bottom 52 of the control hood or hood. A metal insulating tube mount 101 is attached to the side facing the insulator. line 16
The bottom of the hood is pressed between the end face of the insulating tube mount 101 and the end face of the electric wire 16 by the threaded joint 102 that engages with the threaded hole 103 of the hood. The insulator 16 is secured to the inner cylindrical section of the insulating tube mount 101 by an adhesive joint 104.

[Brief explanation of the drawing]

FIG. 1 is an equivalent circuit diagram showing an embodiment of a voltage measuring device according to the present invention in which a measuring resistor is arranged inside a metal box;
A schematic diagram of a first embodiment of the device according to the invention for a second-port expanded single-phase metal box high-voltage switch installation, and FIG. 3 shows an embodiment similar to FIG. 2 for a three-phase metal box switch installation. Schematic diagram, 4th
FIG. 7 is a diagram showing the installation of a resistance wire; FIG. 8 is a partial perspective view of a resistor according to the invention having a widened resistor; FIG. 9 is an enlarged sectional view of area A in FIG. 8; 10th
This figure is a plan view of a strip resistor used in the configurations shown in FIGS. 8 and 9, and FIG. 11 is a diagram showing a method of fixing a hood-shaped control electrode between a high voltage line and a high voltage side resistor. 10...Metal box, 18.20...Resistor, 24...
・Amplifier, 26... Measuring device, 32.14... Tubular insulator, J 6 e 38... Metal plate, 44.46...
- Control electrode, 54...opening. Applicant's representative Patent attorney Takehiko Suzue F'+g, 3 Director General of the Office of the Patent Office Kazuo Wakasugi Display of the case Patent application No. 1989-089997 Name of the invention Relationship with the case of the person who amends the voltage measuring device Patent issue Applicant: Braun Dapali Land C. Akchengsellschaft Agent Date of amendment order: August 31, 1980 Specifications subject to amendment: Documents and drawings

Claims (1)

[Scope of Claims] (1) A resistor of at least 21 m long, arranged in a row between the 1% piezopotential and the ground, forming a voltage divider, of which the grounded resistor is connected to the measuring resistor. A high-voltage switch equipment, comprising at least one resistive element, the resistor on the high-voltage side and the measuring resistor each consisting of an insulator and a resistive material mounted thereon; In a device jl for measuring high alternating current voltage of 967° sulfur gas insulated high voltage switch equipment enclosed in a metal box, an insulator (32/34) is formed into a tubular shape, and a resistive material is laid on the outside of the insulator (32/34). Device characterized in that the transient voltage distribution is controlled by a single 7-domain control electrode (46). (2) The resistance material has a thickness of jI! % characterized by being yeast! Range of F-requirement The device according to item 1. 3. The apparatus of claim 2, wherein the resistive material is a thick film paste applied as a resistive strip onto the insulator. (4) The device according to claim 3, characterized in that the resistance wire runs parallel to the longitudinal axis of the insulator; (5) the resistance wire is spirally attached onto the insulator; 9. A device according to any one of claims 2XJ to 4, characterized in that: (6) A special IFF characterized in that the resistance wires are arranged spirally and alternately on the insulator so that the individual resistance wires cross each other. Fifth
The device according to any one of clauses. (7) Claims 4 to 6, characterized in that the resistance wire is auxiliary attached on the circumference of the insulator.
The device according to any one of clauses. (8) The device according to any one of claims 3 to 7, wherein the resistive material is uniformly attached on the outer peripheral surface of the insulator. (9) A commercially available strip resistor is mounted on the insulator, the strip resistor runs in the longitudinal direction of the insulator, and ends facing each other are connected by a coupling conductor. Equipment described in Section. (2) A contact ring tube arrangement as a metal coupling conductor, each contact ring covering the contact surfaces of two opposing strip resistors and being auxiliary fixed to the individual strip resistor insulator. 10. The device according to claim 9, characterized in that: t-. The ground side end of the resistor (18) on the high voltage side is surrounded by the annular electrode (44), and the control electrode (46) that narrows in the direction of the high voltage side end of the resistor (18) is surrounded by the annular electrode (44). Electrode (4
4) The device according to any one of claims 1 to 1O. (2) The device according to claim 11, characterized in that the seven-domain control electrode (46) is provided with an opening <54>' in the form of a slit, hole or the like.