JPS5848624Y2 - Variable capacitance voltage detection device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an improvement of a variable capacitance voltage detection device.

BACKGROUND ART In gas-insulated, oil-insulated, etc., sealed electrical equipment, a voltage detection device is used to detect the voltage of a live part.

As this voltage detection device, a voltage dividing electrode is interposed between the bus bar serving as the charging part and the container, a voltage dividing capacitor is connected to the voltage dividing electrode, and the voltage of the voltage dividing capacitor is detected via an amplifier. Something like this is sometimes used.

By the way, in this type of device, the capacitance value of the main capacitor constructed between the bus bar and the voltage dividing electrode may vary slightly during manufacturing depending on the diameter of the bus bar, the alignment of the central axis of the bus bar, voltage dividing electrode, and container, and other factors. , variations occur for each product.

For this reason, conventional amplifiers have been designed with an adjustment band width so as to adjust voltage changes due to this variation, but this design is extremely troublesome.

Furthermore, the bus voltage is 66 KV, 77 KV, 204 KV
Even if there are the nearest voltage classes such as 240 KV and 240 KV, there is a drawback that voltage dividing electrodes, amplifiers, etc. must be individually designed and manufactured for each class.

The present invention eliminates the above-mentioned drawbacks by making the capacitance value of the main capacitor variable.

The present invention will be described below based on embodiments shown in the drawings.

In the figure, reference numeral 1 denotes a container for a closed electrical device, and the inside is filled with an insulating medium such as SF6 gas and insulating oil.

3 is an insulating spacer, 4 is a bus bar supported by this spacer, 5 is a cylindrical voltage dividing electrode arranged concentrically between the container 1 and the bus bar 4, 6 is a bushing, and 7 is a bus bar supported by this spacer. A voltage dividing capacitor 8 is inserted between the voltage dividing electrode 5 and the ground, and an amplifier 8 is connected to the voltage dividing capacitor 7.

Reference numeral 9 denotes a spherical terminal electrode attached to the tip of the bus bar 4, and the degree of coupling with the partial voltage electrode 5 can be changed by screwing the pole 9a into the tip of the bus bar 4 as required. .

Note that 10 is a screw for fixing the bolt 9a, and 11 is an end cover.

The partial voltage electrode 5 is provided with a large number of holes 5a over a required length.

Further, an adjustment electrode 12 is rotatably attached to the outer periphery of the voltage dividing electrode 5, and this electrode also has the hole 5a.
The same hole 12a is provided.

Further, although the adjustment electrode 12 can be rotated around the outer periphery of the voltage dividing electrode 5, it is of course possible to fix it at a predetermined position.

For this purpose, for example, the outer periphery of the voltage dividing electrode 5 and the adjusting electrode 12 are
They may be tapered on their inner peripheries so that they can be locked together, or they may be fixed with screws or the like.

In the above configuration, the voltage of the bus 4 is the sum CA + Cs of the capacitance between the main capacitor, that is, the bus 4, the voltage dividing electrode 5, and the terminal electrode 9, and the voltage of the voltage dividing electrode 5 and the container 1. The voltage is divided between C6+07 and the sum C6+07 of the capacitance of the voltage dividing capacitor 7.

The divided voltage is applied to the voltage dividing capacitor 7 via the amplifier 8, and thereby the presence or absence of charging of the bus 4, the magnitude of the voltage, etc. are known.

During manufacturing, if the value of the capacitance CA+CB of the main capacitor varies or does not match the designed value, the adjustment electrode 12 is rotated to adjust the degree of overlap between the holes 5a and 12a of the voltage dividing electrode 5.

Then, the area of the voltage dividing electrode 5 facing the bus bar 4 changes equivalently, the value of the capacitance CA can be adjusted, and a device with no variation in the capacitance of the main capacitor can be obtained. .

Holes 5a and 12a of the voltage dividing electrode 5 and adjustment electrode 12
The shape of is not necessarily limited to circular, but triangular,
Needless to say, it may be rectangular, diamond-shaped, etc.

Further, the voltage dividing electrode 5 may be provided anywhere between the middle and the end of the bus bar 4, but when it is provided at the end, as in the embodiment shown in FIG.
If the terminal electrode 9 at the end of the bus bar 4 is made variable in the axial direction so that the degree of coupling with the voltage dividing electrode 5 can be changed, it is convenient because the adjustment range of the capacitance CA + CB of the main capacitor becomes wider. .

As detailed above, according to the present invention, the opposing area between the voltage dividing electrode and the busbar can be varied by making the adjusting electrode provided on the outer periphery of the voltage dividing electrode rotatable and adjusting the degree of overlap between the holes of both electrodes. Therefore, the capacitance can be made variable on the main capacitor side, making it easy to design an amplifier connected to the voltage dividing capacitor.

Furthermore, when the bus voltage is 66Kv and 77KV, 204Kv
Even in the case of approximate voltage classes such as 240 KV and 240 KV, there is no need to separately design and manufacture voltage dividing electrodes, amplifiers, etc., making it suitable for mass production.

Furthermore, since the opposing area between the voltage dividing electrode and the bus bar is made variable by rotating the adjustment electrode, it is extremely easy to adjust the capacitance, and the adjustment range can be widened, resulting in remarkable practical effects.

[Brief explanation of drawings]

The figure is a longitudinal sectional view showing one embodiment of the present invention. 1... Container, 2... Insulating medium, 4...
...Bus bar, 5...Partial voltage electrode, 7...
・Voltage capacitor, 8... Amplifier, 12...
...Adjustment electrode, 5a, 12a...hole.

Claims (1)

[Scope of utility model registration request] A cylindrical voltage dividing electrode placed concentrically between the busbar and the container of a sealed electrical device filled with an insulating medium, a voltage dividing capacitor inserted between this voltage dividing electrode and the ground, and this and an amplifier for detecting the voltage of a voltage dividing capacitor, in which a hole is provided in the voltage dividing electrode, and an adjustment electrode having a hole similar to the hole is placed on the outer periphery of the voltage dividing electrode to a degree that both holes overlap. 1. A variable capacitance voltage detection device, characterized in that it is rotatably provided so as to adjust the voltage.