JPS6013219Y2 - gas insulated busbar - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas insulated bus bar equipped with a corona detection device.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 11 denotes a plurality of busbar units connected in the axial direction, each having gas separated by an insulating spacer 14. Each busbar unit 11 has a busbar conductor 13 in a grounded metal cylindrical jacket 12. It is filled with insulating gas.

The insulating spacer 14 has a contact 15 that connects the bus conductors of adjacent bus bar units 11, and is also used for corona detection to maintain a floating potential with respect to the grounded shield ring 16 and the bus conductor 11, as shown in FIG. annular electrode 17 of
are buried respectively, and a detection terminal 18 is drawn out from the annular electrode 17.

Reference numeral 19 denotes a measuring device comprising a differential amplifier 20 and a measuring device 21 such as a cathode ray tube oscilloscope.

The plurality of insulating spacers 14 are connected to several groups 14A and 14B in the busbar unit arrangement direction, and the corona detection terminals 18 are connected together for each group, with one connection point A and the other connection point B. A measuring device 19 is always connected between the two.

In this way, if corona discharge occurs in any of the busbar units, the high frequency voltage will propagate to the connection points A and B, and the corona voltage waveform can be observed based on the difference in voltage.

Note that disturbances entering the bus bar from the outside are canceled out, so no differential voltage occurs.

If the detection pulse is observed in this way and an abnormality is recognized, the location where the corona occurs can be easily found by measuring the voltage at the detection terminals of the insulating spacers of groups 14A and 14B.

As described above, according to the present invention, the corona detection electrodes of the insulating spacers provided between the plurality of bus bar units are connected together in groups of two (several pieces), and the corona detection electrodes are connected between the connection points. Since a measuring device is provided to detect the differential voltage at the time of occurrence, it is possible to reliably observe the corona of the entire bus bar without using a large number of measuring devices.

Therefore, safety can be significantly improved economically from the viewpoint of preventing failure of the busbar.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the gas insulated bus bar according to the present invention, and FIG. 2 is a sectional view of a main part of the insulating spacer shown in FIG. 1. 11...Bus bar unit, 12...Outer cover, 13...Bus bar conductor, 14...Insulating spacer, 17...For corona detection Electrode, 19...
····measuring device.

Claims (1)

[Scope of utility model registration request] In a gas-insulated bus bar comprising a plurality of busbar units each having a busbar conductor in its outer sheath, which are connected via insulating spacers, electrodes for corona detection at a floating potential are embedded in each of the plurality of insulating spacers, and the electrodes A gas-insulated bus bar, characterized in that the gas-insulated busbars are connected together in groups of two or more, and a constantly connected measuring device is provided between the connection points for detecting a voltage difference when a corona occurs.