JPH09196996A - Device for testing corona discharge of insulation cylinder and testing method using the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for testing corona discharge of an insulation cylinder and a testing method by which the corona discharging state of an FRP cylinder for polymer porcelain busing can be tested simply. SOLUTION: This device comprises a first ring member 3 to which a voltage is applied and which is provided setably on the outer circumference of an insulation cylinder 2, a second ring member 4 for earthing which is provided setably on the outer circumference of the insulation cylinder 2, and a base 5 for fixing the members 3 and 4 integrally. The inner diameters of the members 3 and 4 are made equivalent to each other, and the sectional shapes of the members 3 and 4 that are cut from the center of the cylinder 2 in the radial direction are made square substantially. By using such a testing device 1, a voltage is applied to the member 3, and the cylinder 2 is moved vertically by a supporting member in this state, thereby giving an electric field to the lower part of the cylinder 2 so as to test the corona discharge state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for inspecting a corona discharge state inside an insulating cylinder material by arranging the insulating cylinder in an electric field, and particularly to FR used for a polymer insulator tube.
The present invention relates to an apparatus and method suitable for inspecting the corona discharge state of a P cylinder.

[0002]

2. Description of the Related Art Since a polymer porcelain tube constituting an electric power device such as a gas circuit breaker is used under a high voltage, an insulating tube such as an FRP tube used for the polymer porcelain tube has an insulation performance of the insulation tube by corona discharge. A corona discharge test is usually performed in order to prevent the deterioration of the battery. In this corona discharge inspection, the insulating cylinder is placed in an electric field to inspect the corona discharge state inside the insulating cylinder material. Usually, the method of simulating the usage state and the 4-ring method are used.

Among them, the method of simulating the usage state is to actually produce, for example, a polymer porcelain tube, and arrange the polymer porcelain tube in an electric field generated by a device simulating the actual use state to inspect the corona discharge state. ing.

Further, in the 4-ring method, as shown in FIG. 5, a first ring member 53 and a second ring member 53 having a circular cross section which are integrally fixed to the outside of an insulating cylinder 51 via an insulating support member 52.
The ring member 54 and the third ring member 56 and the fourth ring member 57, which have a circular cross section and are integrally fixed to the inside of the insulating cylinder 51 via the insulating support member 55, are used. A voltage is applied to the first ring member 53 and the third ring member 56 via the suspending members / lead members 58 and 59, respectively, and constitutes a voltage application side. The second ring member 54 and the fourth ring member 57 are grounded to form a ground side.

Then, the first ring member 53, the second ring member 54, the third ring member 56, and the fourth ring are used by using the suspending members / lead members 58 and 59 in a state where a voltage is applied. The first to fourth ring members 53, 54, 56, 5 are held while maintaining a relative positional relationship such that the member 57 and the member 57 are always in corresponding positions via the insulating cylinder 51.
7 is moved from the lower end to the upper end of the insulating cylinder 51 to inspect the corona discharge state. The above-mentioned measurement by the 4-ring method is carried out in the atmosphere, SF ₆ gas, and insulating oil.
The potential distribution with respect to the insulating cylinder 51 in the above-mentioned 4-ring method is shown in FIG.

[0006]

Among the above-mentioned conventional corona discharge inspection methods, in the method of simulating the usage state, a device that actually uses the insulating cylinder 51, for example, if the FRP cylinder is the insulating cylinder 51, it is used. It is necessary to produce the polymer insulator tube. Further, since it is necessary to perform an assembly test (inspection) as a device and then disassemble the device, there is a problem that it takes a lot of time and labor and leads to an increase in cost.

On the other hand, the four-ring method is more useful than the above-mentioned method of simulating the use condition, but the first and second ring members 53 and 54 on the outer side and the third and fourth inner members on the inner side.
There is a problem that relative positioning is difficult because a predetermined electric field cannot be obtained unless the relative positions of the ring members 56 and 57 in the vertical direction and the radial direction (concentricity) are aligned. In addition, the insulation cylinder 51 which is the measurement object is fixed, and the first to fourth ring members 53, 54, 56 and 57 are moved up and down by the suspension members and lead members 58 and 59 to measure the corona discharge state. Since it is necessary, there is a problem that the measuring device becomes large-scale and the measurement is complicated and time-consuming.

Further, if the object to be measured has a tapered portion, the diameter of the insulating cylinder 51 changes. for that reason,
The entire set cannot be measured with only one set of the first to fourth ring members, and the number of sets of the first to fourth ring members that must be prepared becomes enormous, and the insulating cylinder 51 having a tapered shape is practically used. There was a problem that could not be applied to. Furthermore, since the strength of the electric field that can be applied is weak in measurement in the atmosphere, SF
It is often measured in ₆ or insulating oil, but in that case there was a problem that it took time.

An object of the present invention is to solve the above-mentioned problems,
(EN) An insulating cylinder, preferably a corona discharge inspection device for an insulating cylinder, which can easily inspect the corona discharge state of an FRP cylinder for polymer porcelain tubes, and an inspection method using the same.

[0010]

A corona discharge inspection device for an insulating cylinder according to the present invention is a device for inspecting a corona discharge state inside an insulating cylinder material by arranging the insulating cylinder in an electric field. For arranging a voltage to be applied to the first
Ring member, a ground-side second ring member that is provided on the outer periphery of the insulating cylinder so as to be spaced apart from the first ring member, and the first ring member and the second ring member. And a base provided to integrally fix the first ring member and the second ring member to each other, and the insulation of the first ring member and the second ring member is made the same. It is characterized in that the cross-sectional shape cut in the radial direction from the center of the cylinder is substantially rectangular.

In the corona discharge inspection method for an insulating cylinder of the present invention, the corona discharge inspection device for an insulating cylinder having the above-described structure is used to support the inside of the first ring member and the second ring member. The insulating cylinder held by the member is set, a voltage is applied to the first ring member, and in this state, the supporting member moves the insulating cylinder in the vertical direction, so that the electric field is generated in the lower portion of the insulating cylinder. Is given to inspect the corona discharge state.

According to the present invention, in an FRP cylinder used as a structural member of a polymer porcelain tube which constitutes a bushing of an electric power equipment such as a gas circuit breaker among the insulating cylinders, the potential concentration at a level which actually poses a problem in practical use. It has been achieved based on the findings that it was found that it is only in the lower part of the FRP cylinder facing the grounded internal electrode of the gas bushing that the insulation performance is deteriorated by corona discharge.

Therefore, it is practically sufficient to perform the corona discharge inspection only on the lower part of the FRP tube, and it is not necessary to measure the entire FRP tube. If you move it up and down,
Sufficient corona discharge inspection can be performed. Also,
Even with an insulating cylinder having a tapered portion, if only the lower portion is measured, the diameter does not change so much, and a single set of electrodes is sufficient. As a result, the corona discharge inspection device can be constructed by fixing the first and second ring members, more preferably the third electrode member, on the same base.

Further, in order to carry out the corona discharge inspection in the air by increasing the electric field applied to the insulating cylinder as much as possible, in the above-mentioned present invention, the inner diameters of the first ring member and the second ring member are made the same. At the same time, the cross section of the first ring member and the second ring member taken from the center of the insulating cylinder in the radial direction is substantially rectangular. Further, it is preferable to provide the third electrode member inside the insulating cylinder because the electric field can be further strengthened as compared with the case where the third electrode member is not provided. At this time, a relative positional relationship in which the upper part of the third electrode member is higher than the upper part of the second ring member is preferable because the electric field applied to the insulating cylinder can be further increased.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a partial cross-sectional view showing the structure of an example of a corona discharge inspection device for an insulating cylinder according to the present invention. In the example shown in FIG. 1, the corona discharge inspection device 1 is
A first ring member 3 for disposing a voltage, which is provided so as to be arranged on the outer circumference of the insulating cylinder 2, and the first ring member 3
And the second ring member 4 on the ground side, which is also provided on the outer periphery of the insulating cylinder 2 so as to be vertically separated from each other, and the first ring member 3 and the second ring member 4 are integrally formed. It is composed of a base 5 provided for fixing.
The relative positional relationship between the first ring member 3 and the second ring member 4 and the insulating cylinder 2 is particularly limited as long as the first ring member 3 and the second ring member 4 are outside the insulating cylinder 2. Not something to do. However, the first ring member 3
Also, if the gap between the inner diameter portion of the second ring member 4 and the insulating cylinder 2 is too wide, an electric field of a predetermined strength cannot be applied to the insulating cylinder 2, and it becomes difficult to mount the insulating cylinder 2. For example, an insulating cylinder 2 having an outer diameter of about 300 mm
Therefore, it is preferably about 20 mm.

In addition, at a position corresponding to the second ring member 4 and inside the insulating cylinder 1, a third disk-shaped ground side is provided.
The electrode member 6 is provided, and the third electrode member 6 is fixed to the base 5. The first ring member 3 on the voltage application side is fixed to the base 5 via the insulating support member 7, and the second ring member 4 and the third electrode member 6 on the ground side are each made of a conductive material. It is fixed to the base 5 via support members 8 and 9. Wheels 10 for movement are provided on the base 5. The relative positional relationship between the third electrode member 6 and the insulating cylinder 2 is not particularly limited, but when the inner diameter of the insulating cylinder 2 is about 300 mm, for example, the outer diameter portion of the third electrode member 6 and the insulating cylinder 2 20mm from the inner diameter part of 2 for the same reason
It is preferable to set the degree.

In the corona discharge inspection apparatus 1 having the above-described structure, the inner diameters of the first ring member 3 and the second ring member 4 are the same, and the insulating cylinders of the first ring member 3 and the second ring member 4 are the same. The cross-sectional shape taken from the center of 2 in the radial direction is substantially rectangular. This is because, as will be described later, the electric field strength applied to the insulating cylinder 2 can be increased by the electrode having a rectangular cross section as compared with the electrode having a spherical cross section used in the conventional 4-ring method. Here, "the inner diameters of the first ring member 3 and the second ring member 4 are the same" means that the inner diameters of the both are substantially the same. Further, “substantially rectangular” means a cross-sectional shape that is a linear shape except for the R-shaped portion of the chamfered portion of the normal corner in the example where the cross section is quadrangular. Then, like the inner diameter portions of the first ring member 3 and the second ring member 4 and the outer diameter portion of the third electrode member 6, the portions facing the insulating cylinder 2 are as described above. As long as it has a linear portion, the shapes of the other portions do not have to be linear.

Further, in the example shown in FIG. 1, the outer diameter of the first ring member 3 is made larger than the outer diameter of the second ring member 4, and the first ring member 3 is mounted via the support member 7. The first ring member 3 and the second ring member 3 are easily fixed on the table 5.
The outer diameter of the first ring member 3 need not be larger than the outer diameter of the second ring member 4 as long as the ring member 4 and the ring member 4 can be fixed to the same base 5. Further, in the example shown in FIG. 1, the upper surface of the second ring member 4 and the upper surface of the third electrode member 6 are arranged so as to be located on the same surface.
If the upper surface of the ring member 4 is positioned above the third electrode member 6, the electric field applied to the insulating cylinder 2 can be increased, which is a preferable structure. Further, by enclosing the periphery and bottom of the device with an insulating material such as a plastic sheet and filling the interior of this device with SF ₆ gas at atmospheric pressure, the electric field can be further increased.

Next, a method of performing a corona discharge inspection using the corona discharge inspection device 1 having the above-described structure will be described. First, the present invention aims to inspect only the lower part of the insulating cylinder 2. This is because, as described above, in the FRP cylinder used for the polymer porcelain tube which is particularly important as the object of the present invention among the insulating cylinders 2 of the present invention, the insulation performance deterioration due to corona discharge is caused only at the lower part of the FRP tube. It is based on the finding that it does not occur. Therefore, first of all,
As shown in FIG.
Further, it is set between the second ring member 4 and the third electrode while being supported by a support member (not shown). Next, a voltage is applied to the first ring member 3, and the insulating member 2 is vertically moved by the support member in this state. As a result, an electric field can be applied to the lower portion of the insulating cylinder 2 to inspect the corona discharge state.

In the corona discharge inspection method of the present invention described above, the first ring member 3, the second ring member 4 and the third electrode member 6 are fixed on the same substrate 5,
The relative positional relationship among the first ring member 3, the second ring member 4, and the third electrode member 6 can always be kept constant, and the corona discharge inspection can be easily realized. Further, since it is sufficient to inspect only the lower part of the insulating tube 2, one corona discharge inspection device is prepared for each diameter of the insulating tube 2 regardless of straight shape or taper shape. A discharge test can be performed.

FIG. 2 is a diagram showing a state of an electric field in an example in which only the first ring member 3 and the second ring member 4 are included in the corona discharge inspection device of the present invention. Further, FIG. 3 is a diagram showing a state of an electric field in an example including the first ring member 3, the second ring member 4, and the third electrode member 6 in the corona discharge inspection device of the present invention. Further, FIG. 4 shows an example of the same structure as the example shown in FIG. 2 except that the first ring member 3 and the second ring member 4 are circular in cross section, as an example of the corona discharge inspection device of the comparative example. It is a figure which shows the state of the electric field in.

Comparing the electric field states shown in FIGS. 2 to 4, first, an example in which the first ring member 3 and the second ring member 4 shown in FIG. As compared with the example shown in FIG. 3, the potential gradient becomes smaller,
It can be seen that the electric field that can be applied to the insulating cylinder 2 is weak. Further, among the examples of the present invention, the example in which the third electrode member 6 is provided inside the insulating cylinder 2 as shown in FIG. 3 is different from the example in which the third electrode member 6 is not shown in FIG. In comparison, it can be seen that the potential gradient increases and the electric field that can be applied to the insulating cylinder 2 is strong.

[0023]

As is apparent from the above description, according to the present invention, it is possible to perform a sufficient inspection by performing a corona discharge inspection only on the lower portion of the insulating cylinder, and a predetermined shape is formed on the outside of the insulating cylinder. A corona integrally fixed on the same substrate so that the first ring member and the second ring member can be arranged, and preferably the third electrode member having a predetermined shape can be further arranged inside the insulating cylinder. By using the discharge inspection device to inspect only the lower part of the insulating cylinder, the corona discharge state of the insulating cylinder can be easily obtained even in the atmosphere. The present invention can be suitably applied especially to an FRP cylinder used for a polymer porcelain tube.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing the configuration of an example of an insulating cylinder corona discharge inspection device of the present invention.

FIG. 2 is a diagram showing a state of an electric field in an example of a corona discharge inspection device for an insulating cylinder of the present invention.

FIG. 3 is a diagram showing a state of an electric field in another example of the corona discharge inspection device for an insulating cylinder of the present invention.

FIG. 4 is a diagram showing a state of an electric field in an example of a corona discharge inspection device for an insulating cylinder of a comparative example.

FIG. 5 is a diagram for explaining an example of a 4-ring method as an example of a conventional corona discharge inspection method.

6 is a diagram showing a state of an electric field in the conventional example shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Corona discharge inspection device, 2 Insulation cylinder, 3 1st ring member, 4 2nd ring member, 5 base, 6 3rd electrode member, 7, 8, 9 Support member, 10 wheels

Claims (4)

[Claims] 1. A device for inspecting a corona discharge state inside an insulating cylinder material by arranging the insulating cylinder in an electric field, comprising: a first device for applying a voltage which is arranged on the outer periphery of the insulating cylinder. A ring member, a ground-side second ring member which is provided on the outer periphery of the insulating cylinder so as to be spaced apart from the first ring member, and the first ring member and the second ring member. It consists of a base that is provided to fix it together,
The first ring member and the second ring member have the same inner diameter, and the first ring member and the second ring member have the same inner diameter.
The corona discharge inspection device for an insulating cylinder, wherein a cross-sectional shape of the ring member cut in the radial direction from the center of the insulating cylinder is substantially rectangular. 2. A disk-shaped ground-side third portion of the first ring member and the second ring member, which corresponds to the lower ring member and is inside the insulating cylinder. The corona discharge inspection device for an insulating cylinder according to claim 1, wherein the electrode member is provided, and the third electrode member is fixed to the base. 3. The corona discharge inspection device for an insulating cylinder according to claim 2, wherein the upper surface of the third electrode member is held above the upper surface of the second ring member. 4. A support member is provided inside the first ring member and the second ring member by using the corona discharge inspection device for an insulating cylinder having the structure according to any one of claims 1 to 3. By setting the insulating cylinder in a state of being held by, a voltage is applied to the first ring member, and in this state, the supporting member moves the insulating cylinder in the vertical direction, thereby applying an electric field to the lower portion of the insulating cylinder. A corona discharge inspection method for an insulating cylinder, which comprises inspecting a given corona discharge state.