JPH0353581B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas insulated busbar device, and particularly to the arrangement of voltage detecting electrodes thereof.

A conventional device of this type is shown in FIG. In the figure, 1 is a grounded sealed container;
2 is the center conductor, 3 is the voltage detection electrode, 4 is the airtight terminal,
5 is an amplifier, and 6 is an insulating gas. Sealed container 1
The voltage detecting electrode 3 fixed by the airtight terminal 4 to the opening protruding in the right angle direction is an insulating material (not shown).
The conductor 2 is placed at a predetermined distance from the center conductor 2 supported by the conductor 2. The voltage detecting electrode 3 is electrically connected to an amplifier 5 via an airtight terminal 4. Therefore, when the center conductor 2 is charged by the line voltage, the voltage detection electrode 3 has a voltage divided by the capacitance between it and the center conductor 2. Note that the divided voltage held by the voltage detection electrode 3 can be arbitrarily selected depending on the area of the voltage detection electrode 3 and the distance between the center conductor 2 and the voltage detection electrode 3. By displaying this voltage element with the amplifier 5, the energized state of the center conductor 2 in the sealed container 1 is detected.

Since the conventional voltage detection device is configured and arranged as described above, there is a two-dimensional distance between the center conductor 2 and the voltage detection electrode 3, so in an open phase state, the center conductor 2 of each phase , 2, 2 and the voltage detection electrode 3 is large, and the center conductor with an open phase has a shielding effect, so the fluctuation range of the output voltage is large, and the AC three-phase power supply is detected. This required an amplifier with a very wide sensing range, and the voltage detection device had drawbacks such as poor operation and high cost.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional method. It is an object of the present invention to provide a gas-insulated busbar device equipped with a voltage detecting device capable of detecting a plurality of phase power sources by arranging individual voltage detecting electrodes.

An embodiment of the present invention will be described below with reference to FIG. In the figure, 11 is a grounded sealed container, 21 is a center conductor, 31 is a voltage detecting electrode, 4 is an airtight terminal, 5 is an amplifier, and 6 is an insulating gas. One voltage detection electrode 31 provided opposite to the axial end face of the three-phase central conductor 21 is fixed to the sealed container 11 by the airtight terminal 4. Further, the voltage detecting electrode 31 is eccentric by a predetermined distance l from the electrical equilibrium point 0 with the center conductors 21, 21, 21 of each phase.

FIG. 3 shows the voltage output to the voltage detecting electrode 31 and the amount of eccentricity l under each voltage application condition of this embodiment.
This shows the relationship between In the figure, A indicates when a three-phase alternating current is applied, B indicates when the A phase or C phase is open, C indicates when the A phase or C phase is open, and D indicates when the A or B phase is open. According to FIG. 3, if the amount of eccentricity from the center of the sealed container 11 is zero, the output voltage will be constant except when 3-phase AC is applied, but when 3-phase AC is applied, the output voltage will be zero and voltage detection will not be possible. It disappears. On the other hand, if it is eccentric from the center of the sealed container 11 by a predetermined distance l, then 3
If there is a voltage in any one of the phases, the voltage detection electrode 31 will have an output voltage and can detect voltage. Note that the eccentricity l may be set so that the variation in the value of each output voltage under each voltage application condition is maximized in order to prevent malfunction of the voltage detection device.

In the above embodiment, the case where the three-phase center conductor is arranged in a right isosceles triangle is shown, but the same effect can be obtained even in the case of an equilateral triangle.

As described above, the present invention has a plurality of voltage detecting electrodes arranged facing the axial end faces of the central conductors of the plurality of phases and eccentrically arranged by a predetermined distance from the electrical equilibrium point of the plurality of phases. Since the phase power source can be detected, it is possible to obtain a gas insulated bus device having a more reliable voltage detecting device at low cost.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a gas-insulated busbar device having a conventional voltage detection device, in which a is a sectional side view, b is a partially sectional perspective view, and FIG. 2 is a diagram showing an embodiment of the present invention. FIG. 3 is a graph showing the relationship between the voltage of the voltage detecting electrode and the eccentricity of the voltage detecting electrode according to an embodiment of the present invention. In the figure, 1 and 11 are sealed containers, 2 and 21 are center conductors, 3 and 31 are voltage detection electrodes, 4 is an airtight terminal, 5 is an amplifier, and 6 is an insulating gas. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. In a gas-insulated busbar device configured by filling an insulating gas in a grounded sealed container and accommodating multiple phase conductors in the sealed container, one voltage detection electrode is connected to one of the multiple phase conductors. A gas insulated busbar device, characterized in that it is provided facing the end face in the axial direction and eccentrically a predetermined distance from the electrical equilibrium point of the conductors of the plurality of phases.