JPH0375071B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a test method and apparatus for efficiently carrying out, for example, an electrical insulation strength verification test of bushings.

(Prior Art) A high-voltage transformer is equipped with three large bushings for drawing in each phase of three-phase alternating current.

Conventionally, electrical tests for these bushings have required a transport vehicle to transport the bushings one by one, a hanging device that also serves as a test voltage application part to suspend only the bushings and transport them to the test position, and a porcelain pipe on the oil-submerged side of the bushings. A testing device is used that consists of an insulating oil tank in which the insulating oil is immersed, and an organic solvent tank in which to remove the insulating oil adhering to the insulator tube. Then, using the above test equipment, the bushings are placed one by one on a transport vehicle and moved, and then only the bushings are suspended and transported using a hanging device that also serves as the test voltage application part, and the insulating pipe part of the bushings is connected to the insulating oil. After immersing the bushing in an organic solvent and conducting an electrical test, the insulating oil on the inner side of the bushing is immersed in an organic solvent to remove the insulating oil, and then the bushing is transported again under suspension and then transported on a transport vehicle. An electrical test was being conducted on Butsing.

(Problems to be Solved by the Invention) However, the above-mentioned conventional electrical testing equipment can only handle bushings one by one, and when loading and unloading bushings onto a transport vehicle, a hanging device that also serves as a test voltage application part must be pulled above the bushings. The problem was that it took a lot of effort to hang it, and the work efficiency was low.

In addition, since the organic solvent tank simply stores organic solvent in a container, it is not possible to completely remove the adhered insulating oil by simply immersing the insulating tube part of the bushing in the oil, and the bushing cannot be removed completely from the organic solvent. There was a problem in that it had to be wiped off with a cloth etc.

Structure of the Invention (Means for Solving the Problems) In order to solve the former of the above problems, the first invention includes a bushing 20 that is upright supported in each of a plurality of holes 19 provided in series in the support plate 2, Support plate 2
The supporting plate 2 with the bushing 20 mounted thereon is suspended and conveyed by the hanging device 3 which also serves as the test voltage application section, and while the bushing 20 is supported on the support plate 2, the oil-submerged insulating pipe of the bushing 20 is moved. Part 23
After conducting a high-voltage electrical test by immersing them all in the insulating oil 43, they are pulled out of the insulating oil 43, and the insulated pipe section 23 with the insulating oil 43 attached is soaked in an organic solvent 57.
After washing, the plurality of bushings 20 are suspended and transported together with the support plate 2 by a hanging device 3 which also serves as a test voltage application section, and placed on a moving cart 1.

In order to solve both problems, the second invention provides a support plate 2 having a plurality of holes 19 arranged in series through which the oil-inner insulating pipe part 23 of the bushing 20 is inserted and supports the bushing 20 in an upright state. 2, a hanging tool 3 that also serves as a test voltage application section for suspending and conveying the support plate 2 and conducting an electrical test of the bushing 20, and the insulating pipe part 23 of the bushing 20 submerged in oil. It consists of an insulating oil tank 4 for cleaning the bushings 20, and an oil cleaning device 5 for cleaning the insulating oil 43 adhering to the bushings 20 by circulating an organic solvent 57.

(Function) By employing the above-mentioned means, the first invention can move, transport, electrically test, and clean adhered oil on multiple bushings at once without loading and unloading only the bushings, improving work efficiency. Improved.

In the second invention, by employing the above-mentioned means, in addition to the effect of the first invention, the insulating oil adhering to the oil-inside insulating pipe portion of the bushing is completely cleaned and removed by the adhering oil cleaning device.

(Example) Hereinafter, an example embodying the test apparatus of the present invention will be described with reference to the drawings.

The bushing test equipment generally includes a support plate 2 on which three bushings 20 are placed in an upright position, a mobile cart 1 that supports and moves the support plates 2, and a suspension conveyance of the support plate 2 while applying a voltage to the bushings 20. A hanging fixture 3 that also serves as a test voltage application part for applying , and an insulating pipe part 2 on the oil-in-oil side of the bushing 20 during an electrical test.
3 and an oil cleaning device 5 for cleaning the bushings 20.

First, the movable trolley 1 will be explained with reference to FIGS. 1 to 4. As shown in FIGS. 1 and 2, a square frame-shaped frame 11 is formed of a steel material with an L-shaped cross section.
A pair of fixed casters 13 and a movable caster 1 are installed at four locations on the lower surface of the frame 11 via a mounting plate 12.
4 is attached, and the movable caster 14 enables the truck 1 to be steered.

As shown in FIG. 2, there are a plurality of insertion holes 15a in the four locations of the frame 11 in the diametrical direction (see FIG. 3).
Cylindrical supports 15 are provided which are formed at equal intervals. A cylindrical support rod 16 having a diametrical through hole 16a (see FIG. 3) at its lower end is inserted into each support rod 15.
It is locked in a height-adjustable manner by a bolt 17 inserted through a. As shown in FIG. 4, the upper end portions of these support rods 16 are formed into a truncated cone shape to facilitate insertion into a housing portion 18 of the support plate 2, which will be described later.

Next, the support plate 2 will be explained with reference to FIGS. 1, 2, and 4. The support plate 2 is formed in a planar rectangular shape, and the support rods 16 are provided at four locations on the lower surface of the support plate 2.
A cylindrical accommodating portion 18 is provided at a position corresponding to . In the longitudinal direction of the support plate 2, three holes 19 are formed in a line at equal intervals, and three bushings 20 are provided.
can be placed in an upright position.

The bushing 20 is located at an intermediate portion between the insulating tube section 21 having the upper electrode 22, the insulating tube section 23 having the lower electrode 24, and the both insulating tube sections 21 and 23, and has a flange 26 and a measuring terminal 27. It consists of a supporting metal 25 having a.

Furthermore, ring-shaped hanging fittings 28 are provided at the four corners of the support plate 2.

Next, the test voltage application section-cum-use hanging device 3 is attached to the fifth and sixth
To explain the figure, a slender prismatic suspension main body 3 is connected via an insulator 29 such as a long insulator and a wire 30 that reciprocates along a certain trajectory by an appropriate conveyance mechanism.
1 is suspended, and three conductive lead wires 32 for applying voltage to the upper electrode 22 of the bushing 20 are provided on the lower surface of the suspension main body 31.
A high voltage lead wire 33 whose one end is connected to a test transformer (not shown) is connected to the wire 30, and a corona prevention shield 34 is provided at the lower end of the insulator 29. Four corona prevention pipes 35 are arranged in a grid pattern on the side and lower sides of the hanging device main body 31 by connecting plates 36, and the pair of upper and lower corona prevention pipes 35 are connected to a connecting pipe 37.
are connected by.

Annular hanging fittings 38 are provided on the lower surface of both ends of the hanging main body 31, and a wire 39 can be hung between the hanging fittings 28 and the hanging fittings 28.

Next, the insulating oil tank 4 will be explained with reference to Figs. 7 to 9. As shown in Figs. Three cylindrical insulating oil tanks 4 are fixed to a mounting bracket 44. A communication pipe 45 communicating the three insulating oil tanks 4 is disposed below the truck 40 so that the oil level of the insulating oil 43 is equalized. Note that this communication pipe 45
is provided with a valve 46 for draining oil.

As shown in FIG. 9, cylindrical supports 47 having female threads 47a on the inner circumferential surface of the upper end are provided at four locations on the upper surface of the truck 40. A cylindrical support rod 48 for supporting the support plate 2 having a male threaded portion 48a is screwed into the support column 47, so that the height can be adjusted. The upper end of the support rod 48 is formed in the shape of a truncated cone to facilitate insertion into the receiving portion 18.

Note that bushings 2 are provided on the outer periphery of the upper surface of the trolley 40.
A side plate 49 is provided for receiving drops of insulating oil 43 on the top surface of the trolley 40 during zero-lifting. Further, an oil drain pipe 50 equipped with a valve 51 is provided on the lower surface of the truck 40.

Next, the attached oil cleaning device 5 will be explained with reference to FIGS. 10 to 12.
3 and movable casters 54, a rectangular frame 55 made of steel with an L-shaped cross section is formed on the upper surface of the truck 52. A rectangular parallelepiped solvent tank 56 storing an organic solvent 57 (kerosene in this embodiment) is fixed by the same frame 55 .

Outflow and inflow pipes 58 and 59 for the organic solvent 57 are attached to both longitudinal walls 56a and 56b of the solvent tank 56, and both pipes 58 and 59 are connected to each other. A circulation pump 60 is provided in the outflow pipe 58,
The pump 60 causes the organic solvent 57 to flow as shown by the arrow in FIG. 11, and the insulating oil 43 adhering to the oil-inside insulating pipe part 23 of the bushing 20 immersed in the solvent 57 is completely washed away. That's what I do.

Also, bushings 2 are attached to the top plate 62 of the solvent tank 56.
Three holes 63 are formed through which the oil-inside insulating tube section 23 of No. 0 is inserted. Directly below the hole 63 is a solvent tank 5.
Four discharge nozzles 65 are arranged at equal intervals toward the center of the hole 63 from the air pipes 64 arranged on both sides of the upper part of the hole 63, and the organic solvent 57 adhering to the oil-inside insulating pipe part 23 is atomized by air. I try to make it disperse.

At the top of the top plate 62, so as to cover the hole 63,
A bellows-shaped mist scattering prevention cylinder 66 made of oil-resistant rubber
is attached to prevent the organic solvent 57 from scattering due to air discharged from the discharge nozzle 65. A coil spring 67 is attached to the outer periphery of the mist scattering prevention tube 66 for biasing and holding the prevention tube 66 at an appropriate height. Furthermore, the solvent tank 56
An air vent tube 68 is provided on the top plate 62 so as to be located between the mist scattering prevention tubes 66.

As shown in FIG. 12, a solvent receiver 69 is provided on one longitudinal side of the cart 52 to receive the overflowing organic solvent 57, and a side plate 70 is provided on the outer periphery of the upper end of the cart 52. A drain pipe 71 equipped with a valve 72 is provided on the lower surface of the solvent receiver 69.

As shown in FIG. 10, a level gauge 61 is provided on the side wall of the solvent tank 56 to indicate the liquid level of the organic solvent 57.
is provided.

Next, a bushing testing method using a bushing testing device will be described.

First, as shown in FIG. 1, three bushings 20 are erected and supported on a support plate 2 supported on a moving cart 1, and the three bushings 20 are moved to a high voltage test chamber.

Next, in a high voltage test room, a wire 39 is hooked between the corresponding hanging fittings 38 and 28 of the test voltage application section hanging fitting 3 and the supporting plate 2 shown in FIG. Transported under suspension. At this time, the support plate 2 is connected to the four wires 39.
Because it is suspended, it has good balance.

After the bushing 20 is transported to the upper part of the insulating oil tank 4, the support rod 48 is placed in the housing part 18 to support the support plate 2, as shown in FIG. . At this time, it is necessary to adjust the height of the support rod 48 so that the insulating oil 43 does not adhere to the support fitting 25. Next, as shown in FIG. 13, the wire 39 hooked to the hanging fitting 38 is removed, and the test lead wire 73 of the inspection device is connected to the measurement terminal 27. Note that this electrical test includes a corona test, withstand voltage test, capacitance test, and dielectric loss tangent test.

After completing the high voltage test, the wire 39 is hooked onto the hanging fitting 38 again, and the bushing 20 is attached to the attached oil cleaning device 5 shown in FIG. 10 together with the support plate 2.
Transport under suspension.

Here, the oil-inside insulating pipe part 23 of the bushing 20
The support plate 2 is lowered so that it fits inside the mist scattering prevention cylinder 66, and the oil-inside insulator tube part 23 is cleaned with organic solvent 5.
Immerse completely in 7. At this time, the insulating oil 43 adhering to the insulating pipe portion 23 is completely removed by the flow of the organic solvent 57 by the circulation pump 60. After the insulating oil 43 is removed, the support plate 2 is lifted up and transported again. Note that since the organic solvent 57 adhering to the surface of the oil-inside insulator tube part 23 is atomized or scattered by air discharged from the discharge nozzle 65, wiping with a cloth or the like is omitted. Also,
The mist scattering prevention tube 66 prevents droplets from scattering into the outside air.

After the bushing 20 is suspended and transported together with the support plate 2 to the top of the movable trolley 1 shown in FIG.
A support rod 16 is housed in the support rod 8 to support the support plate 2 on the movable cart 1 and move it.

Now, in this embodiment, a plurality of (three) bushings 20 are supported upright in series on the support plate 2, so that the work can be easily carried out, and
Moving, transporting, electrical testing, and cleaning of adhered oil on a plurality of bushings 20 (three bushings) can be performed at once, improving work efficiency.

Further, the adhered oil cleaning device 5 generates a flow in the organic solvent 57 using the circulation pump 60, and can completely clean and remove the insulating oil 43 adhered to the oil-inside insulating pipe portion 23 of the bushing 20, and can be wiped off with a cloth or the like. does not require.

Effects of the Invention As detailed above, in the first invention, a plurality of bushings are vertically supported in series on a support plate, so it is possible to move, transport, conduct electrical tests on bushings, carry out electrical tests, etc. without loading and unloading only the bushings. It is possible to wash multiple bottles at once, which has an excellent effect of improving work efficiency.

In addition to the effects of the first invention, the second invention has an excellent advantage in that the insulating oil adhering to the oil-inside insulating tube part of the bushing can be completely cleaned and removed by the adhering oil cleaning device, and wiping with cloth etc. can be omitted. effective.

[Brief explanation of drawings]

Fig. 1 is a front view showing the movable cart and support plate, Fig. 2 is a plan view, Figs. 3 and 4 are partially enlarged cross-sectional views, and Fig. 5 is a front cross-sectional view showing a hanging device that also serves as a test voltage application section. , FIG. 6 is a side sectional view, FIG. 7 is a front view showing the insulating oil tank, FIG. 8 is a plan view, FIG. 9 is a partially enlarged sectional view of the vicinity of the support column, and FIG.
The figure is a partially cutaway front view showing the adhered oil cleaning device.
1 is a partially cutaway plan view, FIG. 12 is a partially enlarged sectional view, and FIG. 13 is an explanatory diagram showing an electrical test method. DESCRIPTION OF SYMBOLS 1...Moving trolley, 2...Support plate, 3...Hanging tool also used as test voltage application part, 4...Insulating oil tank, 5...Adhered oil cleaning device, 19...Hole, 20...Butting, 23...Oil-side insulator pipe part, 43... Insulating oil, 57...Organic solvent.

Claims (1)

[Scope of Claims] 1. Bushings 20 are each erected and supported in a plurality of holes 19 provided in series in the support plate 2, and the support plate 2
The supporting plate 2 with the bushing 20 mounted thereon is suspended and conveyed by the hanging device 3 which also serves as the test voltage application section, and while the bushing 20 is supported on the support plate 2, the oil-submerged insulating pipe of the bushing 20 is moved. Part 23
After conducting a high-voltage electrical test by immersing them all in the insulating oil 43, they are pulled out of the insulating oil 43, and the insulated pipe section 23 with the insulating oil 43 attached is soaked in an organic solvent 57.
This test method for bushings is characterized in that the bushings 20 are immersed in the liquid and washed, and after washing, a plurality of bushings 20 are suspended and conveyed together with a support plate 2 by a hanger 3 which also serves as a test voltage application part, and placed on a moving cart 1. 2. A support plate 2 provided with a plurality of holes 19 in series to support the bushing 20 in an upright state by inserting the oil-inside insulator pipe portion 23 of the bushing 20, a movable trolley 1 for supporting and moving the support plate 2; A hanger 3 that also serves as a test voltage application unit for suspending and conveying the support plate 2 and applying a test voltage to the bushing 20, an insulating oil tank 4 for immersing the oil-inside insulating pipe part 23 of the bushing 20, and an organic solvent 57. A bushing testing device comprising an oil cleaning device 5 for cleaning insulating oil 43 adhering to the bushing 20 by circulating the oil. 3 The movable trolley 1 includes a frame 11, casters 13 and 14 attached to the lower surface of the frame 11, and four wheels of the frame 11.
It consists of a pillar 15 provided at a location, and the same pillar 1
Apparatus for testing bushings according to claim 2, wherein the bushing 5 is provided with a height-adjustable support rod 16. 4 There are three holes 19 provided in the support plate 2,
The support plate 2 also has four locations on the lower surface of the movable trolley 1.
4. The bushing testing device according to claim 3, further comprising a cylindrical housing portion 18 at a position corresponding to the support rod 16 of the bushing. 5 The test voltage application unit-cum-sling 3 has a main body 31 suspended via an insulator 29, a corona prevention pipe 35 arranged so as to surround the main body 31, and a voltage applied to the bushing 20. The bushing testing device according to claim 2, comprising a conduction lead wire 32 for applying . 6. The bushing testing device according to claim 2, wherein there are three insulating oil tanks 4, and each insulating oil tank 4 is communicated with each other by a communication pipe 45. 7 The attached oil cleaning device 5 is equipped with outflow and inflow pipes 58 and 59 for the organic solvent 57 on both longitudinal walls 56a and 56b of a rectangular parallelepiped solvent tank 56, and a circulation pump 60 for the organic solvent 57 is provided on either one. A bushing testing device according to claim 2.