JPS6277012A - Insulating spacer - 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 [Technical Field of the Invention] The present invention relates to an insulating spacer that is used by insulatingly supporting a high voltage conductor in a cass tank and filling the space with 7 Jll of SF6 scum.

[Technical background of the invention and its problems] Gas-insulated hermetic busbars have high performance, space-saving, and high reliability, and are therefore widely used in power transmission and distribution switchyards.

Today, equipment is being downsized to reduce costs, but this downsizing has resulted in high stress on insulating spacers, which is a weak point in electrical insulation design.

For this reason, higher reliability is required of insulating spacers than ever before. In order to ensure the reliability of insulating spacers, it is necessary to configure the insulating spacers actually used in such a way that the insulating performance of the spacers can be verified using some external means. Diagnosing the presence or absence of partial discharge is considered to be a promising method for this purpose.

In this case, there are many advantages in terms of maintenance and inspection if the work can be carried out with live wires. To externally diagnose the presence or absence of partial discharge, it is necessary to electrically disconnect the ground side terminal of the insulating spacer from the tank, but with conventional insulating spacers, the ground side terminal is connected integrally with the tank. It was difficult to raise the electrical signal by 1.

[Object of the Invention] An object of the present invention is to provide an improved insulating spacer so that the presence or absence of partial discharge can be externally diagnosed.

[Summary of the Invention] The insulating spacer according to the present invention has a high-voltage side embedded electrode in which a high voltage member is fixed to one side of the insulator in a sealed tank, and a grounding side embedded electrode fixed to the sealed tank on the other side. In the insulating spacer, a mounting flange is provided on the ground-side embedded electrode to be fixed to the sealed tank via an insulator, and the tip of the ground-side embedded electrode is connected to the ground-side embedded electrode through the mounting flange and the insulator.
A grounding rod that is electrically connected to the pole is inserted or pulled out from outside the sealed tank as necessary, and a lead is roughly led out of the sealed tank from the embedded electrode on the ground side through the insulator and the mounting flange. It is characterized by the provision of lines.

[Embodiments of the Invention] The present invention will be described below with reference to embodiments shown in FIGS. 1 and 3. In FIG. 1, an insulating spacer 10 of the present invention is shown.
is installed to accommodate and insulate and support the high voltage conductor 11 in the sealed tank 12. This insulating spacer 10 is
A high voltage side embedded electrode 14 and an installation side embedded electrode 15 are installed on the insulator 13.
It is constructed by embedding.

The high voltage side embedded electrode 14 is connected to the high voltage conductor 1 as shown in the figure.
1, and its ground side embedded electrode 15 is attached to the closed tank 12 side.

In the present invention, this ground side buried electrode 15 is improved. That is, the mounting flange 17 is fixed to the ground side embedded electrode 15 via the insulator 16. This mounting flange 17 is attached to the sealed tank 12 by bolts 18.
By fixing the high voltage conductor 11 to the frame 19 of the insulating spacer 10, the high voltage conductor 11 is insulated and supported within the sealed tank 12. The S'F6 gas is also sealed in the sealed tank 12, but the O2 gas between the mounting flange 17 and the frame 19 is
It is gas sealed with ring 20.

Furthermore, the insulating spacer 1o according to the present invention includes a sealed tank 12, a frame 19, a mounting flange 17, and an insulator 1.
A desired hole 21 is provided in a part of the ground-side embedded electrode 15 through the hole 21, and a conductive ground rod 2? The sealed tank 1
It is attached so that it can be inserted or handled from the outside of 2. Roughly speaking, the insulating spacer 10 according to the present invention includes a sealed tank 12, a pedestal 19, a mounting 7, and a flange 1.
7 and an insulator 16 are provided, and this small hole 2
A lead wire 24 having one end electrically connected to the ground side embedded electrode 15 is led out from the closed tank 12 from the lead wire 3 .

The insulating spacer 10 according to the present invention configured as described above is as follows:
When the high voltage conductor 11 is insulated and supported in the sealed tank 12,
As shown in FIG. 2, between the high potential of the high voltage conductor 11 and the ground potential of the sealed tank 12,
C1 and the equivalent capacitance C2 of the insulator 16, which series capacitor is divided, and the potential of the ground side buried electrode 15 is connected to the lead wire 2.
By leading out of the sealed tank 12 through terminal t1 of No. 4, it can be used as a detection terminal for partial discharge testing. Further, for the switch S in FIG. 2, a grounding rod 22 serves as a movable connection.

During operation of the sealed busbar having the high voltage conductor 11 insulated and supported by the insulating spacer 10 in the present invention, the grounding rod 2
2 is inserted, and the ground side embedded electrode 15 is brought to the ground potential via the sealed tank 12, and a partial discharge detector (not shown) is connected to the terminal t1 of the lead wire 24. Of course, an impedance for partial discharge detection, a converter for signal transmission, etc. are connected to the lead wire 24 as necessary.

Therefore, in order to diagnose the insulation deterioration of the insulating spacer 10 from the outside of the sealed tank 12 during operation of the sealed busbar, first, the grounding rod 22 is pulled out to electrically disconnect the ground side embedded electrode 15 from the tank 12. If there is any insulation deterioration in the insulating spacer 10, electrical signals such as corona discharge are transmitted to the detector from the terminal t1 of the lead wire 24, so it is possible to diagnose the insulation deterioration from outside the sealed tank 12. become.

In another embodiment shown in FIG. 3, a part of the ground side embedded electrode 15 and the mounting flange 17 are embedded in the insulator 16.

This allows the electrode 15, flange 17 and insulator 16 to
It is possible to strengthen the mechanical strength of the adhesive surface between the

Furthermore, by increasing the diameter of the mounting flange 17, stable support of the high voltage conductor 11 is achieved.

[Effects of the Invention] As described above, according to the present invention, a mounting flange fixed to a sealed tank via an insulator is provided on the ground-side embedded electrode of an insulating spacer, and the mounting flange is fixed to the ground-side embedded electrode through the insulator and the ground-side embedded electrode. By providing a grounding rod between the electrodes that can be inserted or pulled out from outside the sealed tank as necessary, and leading the lead wire from the ground side embedded electrode to the outside of the sealed tank, the grounding rod is normally connected to the grounding rod during operation of the sealed busbar. is inserted to make the ground-side embedded electrode and the sealed tank have the same potential, and during external diagnosis, by pulling the ground rod across, the partial discharge generated inside can be verified using a detector connected to the lead wire from the outside. can do.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of an insulating spacer according to the invention, FIG. 2 is an electrical equivalent circuit diagram thereof, and FIG. 3 is a sectional view showing another embodiment of the invention. 10... Insulating spacer 11... High voltage conductor 12... Sealed tank 13... Insulator 14... High voltage side embedded electrode 15... Ground side embedded electrode 16... Insulator 17 ... Mounting flange 19 ... Frame, 20 ... 0 ring 2
1...hole, 22...ground rod 23...small hole, 24...lead wire (8733) Agent: Yoshiaki Inomata, patent attorney (and others)
1 person) Figure 1 Figure 3 Procedural Amendment (Voluntary) 60.1024 Showa Year Month Date

Claims (1)

[Claims] In an insulating spacer that is located in a sealed tank and has a high voltage side embedded electrode on one side of the insulator to which a high voltage member is fixed, and a ground side embedded electrode on the other side that is fixed to the sealed tank, the ground side embedded electrode A mounting flange is provided to be fixed to the sealed tank via an insulator, and a grounding rod whose tip is electrically connected to the ground side embedded electrode is inserted from outside the sealed tank as necessary through the mounting flange and the insulator. An insulating spacer characterized by being provided with a grounding rod that can be inserted or pulled out, and further provided with a lead wire led out of a sealed tank from a ground side embedded electrode through an insulator and a mounting flange.