JPS61288176A - Method and device for testing bushing - Google Patents

Abstract

PURPOSE:To perform the movement, transportation, electric test, and sticking oil removal of plural bushings at a time by erecting and supporting the plural bushings on a support plate in series. CONSTITUTION:The bushings 20 are erected and supported on the support plate 2 supported on a moving carriage 1 and moved to a high voltage testing chamber. Then, a wire is extended between metallic suspenders 28 and the bushings 20 are suspended and carried together with the support plate 2. The bushings 20 are conveyed to over an insulating oil tank and then a support rod 16 is put in a storage part 18 to support the support plate 2, thereby dipping an in-oil side insulator tube part 23 in the insulating oil. Then, the test lead wire of an inspecting device is connected to a terminal 27 for measurement. Then, a high-voltage test is conducted and then the bushings 20 are suspended and carried together with the support plate 2. In this case, the support plate 2 is so lowered that the insulator tube parts 23 of the bushings 20 are put in a mist scatter preventive cylinder, and the insulator tube parts 23 are dipped in an organic solvent completely. Further, the bushings 20 are suspended and conveyed to over a car truck 1 together with the support plate 2 and the rod 16 is put in a storage part 18 to support and move the support plate 2 on the car truck 1.

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 a bushing.

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

Conventionally, electrical testing of these bushings has required a transport vehicle to transport each bushing one by one, a hanging device that also serves as a test voltage application part to suspend only the bushing and transport it to the test position, and a porcelain tube part on the oil-submerged side of the bushing. 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 test equipment described above, the bushings were placed one by one on a transport vehicle and transported, and then only the bushings were suspended and transported using a hanging device that also served as the test voltage application part, and the insulating pipe part of the bushing was placed in an insulating oil. After immersing the bushing in an organic solvent and conducting an electrical test, the bushing is then immersed in an organic solvent to remove the insulating oil that has adhered to it.The bushing is then transported under suspension and placed on a transport vehicle for transport. An electrical test was being conducted on the bushing.

(Problems to be Solved by the Invention) However, the above-mentioned conventional electrical testing equipment can only handle bushings one by one, and requires the work of hooking a hanging tool that also serves as a test voltage application unit onto the top of the bushing when loading and unloading the bushings onto a transport vehicle. However, there were problems in that it was time-consuming 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, The support plate 2 is moved by the moving cart 1, and the support plate 2 on which the bushing 20 is placed is suspended and conveyed by the hanging tool 3 which also serves as the test voltage application part, and while the bushing 20 is supported on the support plate 2, After performing a high-voltage electrical test by immersing the oil-filled insulator tube section 23 all at once in the insulating oil 43, it is pulled out of the insulating oil 43, and the oil-inside insulator tube section 23 with the insulating oil 43 attached is immersed in an organic solvent 57. A configuration is adopted in which the bushings 20 are soaked and cleaned, and after cleaning, the plurality of bushings 20 are suspended and conveyed together with the support plate 2 by a hanger 3 which also serves as a test voltage application part, and placed on the movable trolley 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; a mobile cart 1 that supports and moves the support plate 2; a suspension tool 3 that also serves as a test voltage application unit for suspending and conveying the support plate 2 and conducting an electrical test of the bushing 20;
The bushing 20 is composed of an insulating oil tank 4 for immersing the oil-filled insulating pipe portion 23, and an oil cleaning device 5 for cleaning the insulating oil 43 adhering to the bushing 20 by circulating an organic solvent 57.

(Function) The first invention adopts the above means, so that the bushing can be moved and unloaded without loading and unloading only the bushing.
Transport, electrical testing, and cleaning of adhered oil are performed on multiple rods at once, improving work efficiency.

The second invention employs the above-mentioned means, and in addition to the effects 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) An example embodying the test apparatus of the present invention will be described below with reference to the drawings.

The bushing test equipment consists of three bushings 20
a support plate 2 on which the support plate 2 is placed in an upright state, a mobile cart 1 that supports and moves the support plate 2, and a hanging fixture 3 that also serves as a test voltage application unit for suspending and transporting the support plate 2 and applying voltage to the bushing 20. , an insulating oil tank 4 for immersing the inner insulating pipe portion 23 of the bushing 20 during an electrical test, and an oil cleaning device 5 for cleaning the bushing 20.

First, the movable trolley 1 will be explained with reference to FIGS. 1 to 4. As shown in FIGS. 1 and 2, a rectangular frame-shaped frame 11 is formed of steel or material with a cross-sectional shape.

A pair of fixed casters 13 and movable casters 14 are attached to four locations on the lower surface of the frame 11 via mounting plates 12, and the movable casters 14 enable the cart 1 to be steered.

As shown in FIG. 2, cylindrical supports 15 are provided at four locations on the frame 11 in which a plurality of insertion holes 15a (see FIG. 3) are formed at equal intervals in the diameter direction. Each pillar 15
has a diametrical through hole 16a at the lower end (see Figure 3).
A cylindrical support rod 1ε with
It is locked in a height-adjustable manner by a bolt 17 inserted through the insertion hole 15a. As shown in FIG. 4, the upper end portions of these support ports γ doors 16 are formed into a truncated conical shape.
This makes it easy to insert it 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 has cylindrical shapes at four locations corresponding to the support rods 16 on its lower surface. A housing section 18 is provided. Three holes 19 are formed in a line in the longitudinal direction of the support plate 2 at equal intervals, so that three bushings 20 can be placed in an upright position.

The bushing 20 includes an air side insulator tube part 21 having an upper electrode 22, an oil side insulator tube part 23 having a lower electrode 24,
It consists of a support fitting 25 located in the middle of the dual tube portions 21 and 23 and having a flange 26 and a measuring terminal 27.

Additionally, annular hanging fittings 28 are provided at the four corners of the support plate 2.
is provided.

Next, referring to FIGS. 5 and 6, the test voltage application unit-cum-suspension device 3 is explained. The test voltage application unit-combined hanging device 3 is connected to a slender prismatic shape through an insulating material 29 such as a long insulator and a wire 30, which reciprocates along a certain trajectory by an appropriate conveyance mechanism. A suspension main body 31 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 vibes 35 are arranged in a grid pattern on the sides and lower sides of the hanger main body 31 by connecting plates 36, and the pair of corona prevention vibes 35 on the upper and lower sides are connected to a connecting vibe 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 is hung between the hanging fittings 28 and the hanging fittings 28.

Next, explaining the insulating oil tank 4 with reference to FIGS. 7 to 9, as shown in FIG. 7.8, a pair of fixed casters 41 are provided on the bottom surface.
And on the upper surface of the trolley 40 equipped with movable casters 42,
Three cylindrical insulating oil tanks 4 storing insulating oil 43 are fixed by mounting brackets 44. A communication pipe 45 that communicates the three insulating oil tanks 4 is arranged below the vehicle 40, and the insulating oil 4
The oil levels in 3 are made to be equal. Note that this communication pipe 45 is provided with a pulp 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, and its height can be adjusted. The upper end of this support rod 48 is formed into a truncated cone shape, and the support rod 48 has a truncated conical shape.
It is easy to insert into 8.

A side plate 49 is provided on the outer periphery of the upper surface of the truck 40 to receive drops of the insulating oil 43 when the bushing 20 is pulled up on the upper surface of the truck 40. Further, an oil drain pipe 50 provided with pulp 51 is provided on the lower surface of the truck 40.

Next, the adhered oil cleaning device 5 will be explained with reference to FIGS. 1O to 12. A square frame 55 is formed on the upper surface of the trolley 52, which is equipped with a pair of fixed casters 53 and movable casters 54 on the lower surface. has been done. A rectangular parallelepiped solvent tank 56 containing an organic solvent 57 (kerosene in this embodiment) is fixed by the open 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 5B and 59 are connected to each other. A circulation pump 60 is provided in the outflow pipe 58, and the pump 60 causes the organic solvent 57 to flow as shown by the arrow in FIG.
The insulating oil 43 adhering to the surface is completely cleaned and removed.

Further, three holes 63 are formed in the top plate 62 of the solvent tank 56, through which the oil-inside insulating pipe portion 23 of the bushing 20 is inserted. Immediately below the opening 63 , four discharge nozzles 65 are arranged at equal intervals toward the center of the hole 63 from air pipes 64 arranged on both sides of the upper part of the solvent tank 56 .
The organic solvent 57 adhering to 3 is atomized and scattered by air.

A bellows-shaped mist scattering prevention tube 66 made of oil-resistant rubber is attached to the top of the top plate 62 so as to cover the hole 63, and the organic solvent 5 is removed by the air discharged from the discharge nozzle 65.
7 to prevent scattering. 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 a normal height. Furthermore, an air vent tube 68 is provided on the top plate 62 of the solvent tank 56 so as to be located between the mist enka prevention tubes 66.

As shown in FIG. 12, a solvent receiver 69 for receiving the overflowing organic solvent 57 is provided on the − side of the cart 52 in the longitudinal direction, and an inverted plate 70 is provided on the outer periphery of the upper end of the cart 52. A drain pipe 71 provided with pulp 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.

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 the high-voltage test chamber, the hanging fittings 38 corresponding to the hanging fittings 3 and the supporting plate 2, which also serve as test voltage application parts, shown in FIG.
．． A wire 39 is hooked between the wires 28 and the bushing 20 is suspended and conveyed together with the support plate 2. At this time, since the support plate 2 is suspended by four wires 39, the balance is good.

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 on 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 10th FI! It is suspended and transported to the attached oil cleaning device 5 shown in J.

Here, the support IIFi2 is lowered so that the oil-inside insulator tube part 23 of the bushing 20 is housed within the mist scattering prevention tube 66, and the oil-inside insulator tube part 23 is completely immersed in the organic solvent 57. 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. In addition, the mist scattering prevention tube 66 prevents droplets from scattering into the outside air.

When the bushing 20 and the support plate 2 are suspended and transported to the top of the movable cart 1 shown in FIG. 1, the support rod 16 is housed in the accommodating portion 18, the support plate 2 is supported on the movable cart 1, and the bushing is moved.

Now, in this embodiment, a plurality of (three) bushings 20
The bushings 20 are supported vertically in series on the support plate 2, making it easy to perform the work, as well as making it easier to move the bushing 20.
Transport, electrical testing, and cleaning of adhered oil can be performed on multiple (3) pipes at once, improving work efficiency.

Further, the attached oil cleaning device 5 is operated by a circulation pump 6o.
By causing the melt 57 to flow, the insulating oil 43 adhering to the oil-inside insulator tube part 23 of the bushing 20 can be completely cleaned and removed, and wiping with cloth or the like is not required.

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 there is no need to load or unload only the bushings, and the movement, transportation, electrical testing, and adhering oil of the bushings can be easily carried out. 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 it is possible to completely clean and remove insulating oil adhering to the oil-inside insulating pipe part of the bushing by using an adhering oil cleaning device, thereby eliminating the need for wiping with a cloth or the like. 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 sectional views, and Fig.
The figure is a front sectional view showing the hanging device that also serves as the test voltage application part, Fig. 6 is a side sectional view, Fig. 7 is a front view showing the insulating oil tank, Fig. 8 is a plan view, and Fig. 9 is a view of the area near the support. A partially enlarged sectional view, FIG. 10 is a partially broken pressure surface view showing the attached oil cleaning device,
FIG. 11 is a partially broken pressure surface 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... Adhesive oil cleaning device, 19... Hole, 20... ...Bushing, 23
...Oil-inside insulator tube section, 43...Insulating oil, 57...Organic solvent.

Claims (1)

[Claims] 1. Bushings (20) are each erected and supported in a plurality of holes (19) provided in series in the support plate (2).
2) is moved by the moving trolley (1), and the bushing (20
) on which the support plate (2) is mounted is attached to the test voltage application unit (
3), and the bushing (2) is attached to the support plate (2).
While supporting the bushing (20), conduct a high voltage electrical test by immersing the insulating pipe part (23) of the same bushing (20) in the insulating oil (43), and then pull it out of the insulating oil (43). The oil-inner insulator tube part (23) with the insulating oil (43) attached is immersed in an organic solvent (57) to clean it, and after cleaning, a test voltage is applied to the plurality of bushings (20) together with the support plate (2). Mobile trolley (1) suspended and transported using a multi-purpose hanging device (3)
A test method for bushings characterized by placing the bushings on the 2. A support plate (2) provided with a plurality of holes (19) in series for inserting the oil-inside insulator tube part (23) of the bushing (20) and supporting the bushing (20) in an upright state; 2
) and a mobile cart (1) that supports and moves the support plate (2).
a hanging tool (3) that also serves as a test voltage application unit for suspending and conveying the bushing and applying a test voltage to the bushing (20);
An insulating oil tank (4) for immersing the inner insulating pipe part (23) of the bushing (20) and adhering oil for cleaning the insulating oil (43) adhering to the bushing (20) by circulating an organic solvent (57). A bushing testing device comprising a cleaning device (5). 3 The movable trolley (1) has a frame (11), casters (13, 14) attached to the lower surface of the frame (11), and a frame (1).
The bushing according to claim 2, wherein the bushing comprises struts (15) provided at the four locations of 1), and the struts (15) are provided with height-adjustable support rods (16). test equipment. 4 There are three holes (19) provided in the support plate (2), and the support plate (2) has four holes on the lower surface with the movable trolley (
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 item 1). 5 The hanging tool (3) that also serves as the test voltage application part is an insulator (29)
for applying voltage to the suspension main body (31), the corona prevention pipe (35) arranged so as to surround the suspension main body (31), and the bushing (20). The bushing testing device according to claim 2, comprising a conduction lead wire (32). 6 There are three insulating oil tanks (4), and each insulating oil tank (
4) is a bushing testing device according to claim 2, wherein the bushings are communicated through a communication pipe (45). 7 The adhering oil cleaning device (5) is equipped with an organic solvent (57) on both longitudinal walls (56a, 56b) of a rectangular parallelepiped solvent tank (56).
3. The bushing testing device according to claim 2, comprising outflow and inflow pipes (58, 59), and a circulation pump (60) for an organic solvent (57) provided on one of them.