JPS6356112A - Insulating spacer - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an insulating spacer used for insulating support of a high voltage conductor in a gas insulated pipeline busbar or a gas insulated switchgear.

(Prior Art) A gas-insulated pipeline busbar or a gas-insulated switchgear consists of a high-voltage conductor inserted into a grounded metal container together with an insulating gas (for example, SFe gas). An insulating spacer is used to provide insulated support within a grounded metal enclosure. This insulating spacer is used. Examples of the insulating spacer include post-shaped spacers used where gas division is not required, and disk-shaped spacers and cone-shaped spacers used for gas division.

FIG. 8 shows an example of a conventional cone-shaped spacer.

1 in the figure is a high voltage conductor, which is made of insulating gas (e.g. SF6
It is inserted into a grounded metal container 3 containing gas) 2, and is insulated and supported by an insulating spacer body 4. This insulating spacer main body 4 is integrally formed with a metal fitting 5 on the high voltage side and an insulator 4a in which a grounding shield 6 on the grounding side is buried.

Further, 7 is a metal 7 fixed to the flange portion 3a of the grounded metal container 3 with a bolt 8 using a screw carved therein.
Do lunges. As shown in FIG. 9, this metal flange 7 is integrally fixed by the insulating spacer main body 4 and a metal member 9. That is, the insulating spacer body 4 and the metal flange 7 have separate structures, and these spacer bodies 4
There are four recesses 10.
．． 10.10.10 incorporates a metal member 9.

The shapes of these recesses 10.10° 10, 10 and the metal member 9 restrain the insulating spacer body 4 and the metal flange 7 in the axial and radial directions of the insulating spacer, as shown in FIGS. 10 and 11. is configured to do so. The insulating spacer main body 4 and the metal flange 7 are fixed by tightening and fixing the metal member 9 to the metal flange 7 with bolts 11.

Further, as shown in FIG. 12, the potential of the ground shield 6 embedded in the spacer body 4 is controlled by the connection mechanism 12 built in the metal member 9, that is, in the hole 13 made in the metal member 9. A guide 14, which is slidably provided in This can be ensured by making surface contact with the stud 17 that has been placed.

(Problems to be Solved by the Invention) However, in the insulating spacer having such a structure, the metal flange 7 and the insulating spacer main body have separate structures, so while it is inexpensive, there is no electrical conductivity on the ground side of the insulating spacer main body 4. Since the grounding shield 6, which is a grounding ring, is embedded and is always grounded via the connection mechanism 12 built into the metal member 9, microcorona discharges generated inside the grounding metal container 3 and the insulating spacer are prevented. Also, it is not possible to measure the surge voltage that occurs when the disconnector of a gas-insulated switchgear is opened or closed. Note that micro corona discharge and surge voltage measurements are extremely important for quality control of gas insulated pipeline busbars and gas insulated switchgear.

The present invention has been made based on the above circumstances, and an object thereof is to provide an insulating spacer that is inexpensive and yet allows for easy measurement of microcorona discharge and surge voltage.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes an insulating spacer body that insulates and supports a high voltage conductor in a grounded container filled with an insulating gas, a shield embedded in the insulating spacer body, In the insulating spacer comprising a metal flange that is arranged to engage with the outer peripheral surface of the insulating spacer main body and is sandwiched between flanges of a grounding container, a switching device is provided to electrically close or open a circuit between the metal flange and the shield. This is an attempt to solve the above-mentioned problems.

(Function) The switchgear electrically connects the metal flange and the shield in normal times, and releases the electrical connection between the metal 7 flange and the shield when performing corona detection or surge voltage detection, etc. It acts to float the shield and derive the potential of the shield.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4. In addition, in FIGS. 1 to 4, the above-mentioned FIGS. 8 to 1
Components having the same configuration as those in FIG. 2 are denoted by the same reference numerals, and explanation thereof will be omitted.

In FIG. 1, reference numeral 30 denotes a switch device embedded in a metal flange 7 that is engaged with the outer peripheral surface of the insulating spacer main body 4. As shown in FIG. Reference numeral 18 denotes a screw-type metal tube that is inserted into the metal flange 7. An insulating tube 19 is provided inside the screw-type metal tube 18, and a ground shield 6 embedded in the insulating spacer body 4 is connected to the inside of the insulating tube 19. A contact hardware 20 is provided which is electrically connected to the protruding stud 17.

An insulating tube 21 is attached to the contact hardware 20, and a metal member 22 and a metal plate spring 24 are disposed inside the insulating tube 21. Further, a guide metal 25 is attached using the inner thread of the threaded metal cylinder 18 and sealed with a cap 26.

One end of the metal plate spring 24 is in electrical contact with the metal member 22 and the other end is in electrical contact with the guide metal 25.

Therefore, under normal conditions, the grounding shield 6 is grounded via the stud 17, the contact hardware 20, the metal member 22, the metal plate spring 24, the guide metal 25, the threaded metal 818, the metal flange 7, and the flange 3a of the grounded metal container 3. be done.

Next, the switchgear 31 having the structure shown in FIG. 2 is completely the same as the switchgear 30 having the structure shown in FIG. 1, except that an impedance element 23 is provided in place of the metal member 22.

Under normal conditions, the ground shield 6 is grounded via the stud 17, the contact hardware 20, the impedance element 23, the metal plate spring 24, the guide metal 25, the threaded metal tube 18, the metal flange 7, and the flange 3a of the ground metal container 3. be done.

The opening/closing device 30 shown in FIG. 1 and the opening/closing device 31 shown in FIG. 2 are embedded in the metal flange 7 either singly or in combination.

Next, during corona detection and surge voltage measurement, the voltage detection rod 28 attached to the insulating cap 27 is screwed into the guide metal 25 instead of the cap 26, as shown in FIGS. 3 and 4. Then, the tip of the voltage detection rod 28 touches the metal plate spring 2.
4 is pushed away, and the contact with the guide metal 25 is released.

Here, since the voltage detection rod 28 is insulated by the insulating cap 27, the ground shield 6 is in a floating state, and its potential can be measured by the voltage detection rod 28.

Furthermore, when detecting corona and measuring surge voltage, a voltage detection terminal having a metal member 22 and an impedance element 23 is selectively used.

That is, when corona is detected, the switching device 31 shown in FIG. 2 is kept in a closed state and the impedance element 23 is kept in a grounded state. Then, the metal plate spring 24 of the switchgear 30 shown in FIG. 1 is pushed away with the voltage detection rod 28, the grounding shield 6 is made to float, and its potential is measured.

That is, a plurality of switchgear 3 are embedded in the metal flange 7.
0.31, the switchgear 30 is in the state shown in FIG.
The switchgear 31 is in the state shown in FIG.
Measure the potential of

In the case of corona detection, by setting the impedance of the impedance element to an appropriate value, it is possible to set the voltage to be measured to a value suitable for the input voltage of the measuring instrument.

Next, when measuring the surge voltage, the impedance element 23 is also floated. That is, both the opening and closing devices 30 and 31 are brought into the state shown in FIGS. 3 and 4. Switching device 30 having metal member 22
The potential of the grounding shield 6 is measured from the side. For this reason,
The voltage detection rod 28 shown in FIG. 4 does not necessarily have to be electrically conductive.

(Other Embodiments) Next, other embodiments of the present invention will be described with reference to FIGS. 5 to 7.

In FIGS. 5 to 7, parts having the same configuration as those in FIGS. 1 to 4 are designated by the same reference numerals, and the explanation thereof will be omitted.

In the switchgear 32 shown in FIG. 5, the contact hardware 20 includes a metal member 21, an insulating cylinder 22, an impedance element 2
3 are arranged concentrically on the same cylinder, and the metal member 21 and the impedance element 23 are each provided with a spring 24, a stopper 25, and a spring 26 with a metal plate. Further, a guide metal 27 is attached using the inner thread of the threaded metal cylinder 18 and sealed with a cap 28.

In normal times, the grounding shield 6 includes studs 17, contact hardware 20. Metal member 21, spring 24, stopper 25, spring with metal plate 26, guide metal 27, screw type metal cylinder 18,
It is grounded via the metal flange 7 and the flange 3a of the grounded metal container 3. On the other hand, the impedance element 23 is similarly grounded via the metal plate spring 26, the guide metal 27, the threaded metal tube 18, the metal flange 7, and the flange 3a of the grounded metal container 3.

In the opening/closing device 32 configured as described above, when corona is detected, the voltage detection rod 29a of the detection cap 29 made of an insulating material is screwed into the guide metal 27 instead of the cap 28, as shown in FIG. Then, the tip of the voltage detection rod 29a pushes the metal plate 25 away, and the plate 26 of the metal plate screw 26
Contact with a is canceled. Here, since the voltage detection rod 29a is insulated by the voltage detection cap 29, the grounding shield 6
is in a floating state due to the impedance element 23, and its potential can be measured with the voltage detection rod 29a.

Further, when measuring a surge voltage, the voltage detection rod 29b of the voltage detection cap 29 made of an insulating material is screwed into the guide metal 27 instead of the cap 28, as shown in FIG. Then, the tip of the voltage detection rod 29b pushes away the plate 26a of the metal plate screw 26, and the contact with the guide metal 27 is released. Here, since the voltage detection rod 29b is insulated by the voltage detection cap 29, the ground shield 6 is in a floating state, and its potential can be measured by the voltage detection rod 29b.

In this way, by using the voltage detection cap 29 properly, it is possible to measure the corona generated in or near the insulating spacer and the surge voltage generated during the operation of the gas insulated switchgear. This can greatly contribute to improving the quality of gas-insulated pipeline busbars and preventing accidents.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to measure the corona generated in the insulated spacer or near the spacer and the surge voltage generated during the operation of the gas insulated rM closing device.
It can greatly contribute to improving the quality of gas-insulated switchgear and gas-insulated pipeline busbars and preventing accidents.

In the case of corona detection, by setting the impedance of the impedance element to an appropriate value, it is possible to set the voltage to be measured to a value suitable for the input voltage of the measuring instrument.

Fig. 1 and Fig. 2 are cross-sectional views showing the normal state and the first embodiment, Fig. 4 is a cross-sectional view showing the normal state, and Figs. FIG. 9 is a front view and a sectional view taken along the -V line.

DESCRIPTION OF SYMBOLS 1...High voltage conductor, 2...Insulating gas, 3...Grounded metal container, 3a...Flange part, 4...Insulating spacer body, 4a...Insulator, 5...Hardware , 6... Grounding shield, 7... Metal flange, 9... Metal member, 10... Hollow, 12... Connection mechanism, 18...
Threaded metal tube, 19.21... Insulating tube, 20... Contact hardware, 22... Metal member, 23... Impedance element, 24... Spring with metal plate, 25... Guide metal, 26... Cap, 27... Insulating cap, 2
8...Voltage detection rod, 30, 31.32...Switching device.

Agent: Patent Attorney Noriyuki Chika Same as Hirofumi Mitsumata Corona gift certificate Figure 3 Figure 4 Figure 7 Space length A partial heart diagram at the end of the foot Figure 10

Claims (1)

[Claims] 1) a) an insulating spacer body that insulates and supports a high-voltage conductor in a grounded container filled with an insulating gas; b) a shield embedded within the insulating spacer body; c) ) a metal flange that is arranged to engage with the outer peripheral surface of the insulating spacer main body and sandwiched between the flanges of the grounding container; d) a switching device that electrically closes or opens a circuit between the metal flange and the shield; ) The switchgear electrically connects the metal flange and the shield during normal times, but when performing corona detection or surge voltage detection, the electrical connection between the metal flange and the shield is released and the shield is suspended. An insulating spacer characterized in that the electric potential of the shield is derived from the electric potential of the shield. 2) The insulating spacer according to claim 1, wherein an impedance element is inserted in series between the switchgear and the shield. 3) The insulating spacer according to claim 1, wherein a plurality of the switching devices are provided, and an impedance element is inserted in series between at least one switching device and the shield. 4) The insulating spacer according to claim 2, wherein the impedance element has a cylindrical shape and is arranged substantially concentrically with the switching device.