JP2010190702A - Sample positioning tool for testing withstand voltage, and withstand voltage testing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately perform a withstand voltage test with an insulation cap (a work guard) as a sample without requiring any complicated work for adjusting the position of the sample. <P>SOLUTION: A sample positioning tool for testing withstand voltages includes: a water absorption substrate 111 including an upper surface that becomes a reference surface in a withstand voltage test to be performed by applying test voltages to a water tank electrode 241 in water tank fresh water Wp stored up to a reference surface of a testing water tank 201 while being stored in the testing water tank 201 and a sample electrode 261 in sample fresh water Ws stored up to a reference surface of not less than two insulation caps 11 dipped into the water tank fresh water Wp while projecting from the reference surface by a prescribed amount of projection and being separated by a prescribed interval mutually; and not less than two positioning holes 121 that are provided on an upper surface of the substrate 111 and have the same depth for supporting the insulation caps 11 by a bottom face 122. The depth of the positioning hole 121 is such that the amount of projection from the reference surface of the insulation caps 11 supported by the bottom face 122 reaches a prescribed amount of projection. The arrangement interval of the positioning hole 121 is such that the insulation caps 11 are separated by a prescribed interval. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a withstand voltage test sample positioning tool and a withstand voltage test apparatus used by a tester in a withstand voltage test using an insulating cap as a sample.

  Occupational safety and health regulations obligate hot-line workers to use protective armor for work. Therefore, a hot wire operator performs work by fitting a work armor that is an insulating cap on a handle portion of an indirect hot wire tool such as a hot stick (for example, see Patent Document 1). In some cases, an insulating cap (see, for example, Patent Document 2) is fitted into the wire terminal.

  FIG. 4 is a perspective view showing the work armor 11. The work armor 11 has, for example, a concave hole 12 into which a handle portion of a bar-shaped indirect live tool is inserted. That is, one end surface of the work armor 11 is the opening surface 13, and the other end of the work armor 11 is a closed end 15 that is closed. The work armor 11 of FIG. 4 is reduced in diameter from the opening surface 13 side toward the closed end 15 side. The work armor 11 shown in FIG. 4 has a circular flange 14 around the opening surface 13.

  The work armor 11 is deteriorated by use over time, and a hole is formed or a part thereof is thinned. It is very dangerous for a hot wire operator to use the deteriorated work armor 11 for hot wire work. Therefore, a withstand voltage test using the work armor 11 as a sample is regularly performed (for example, within six months) at a business office to which a live-line worker belongs.

  FIG. 5 is a cross-sectional view schematically showing a state of a conventional withstand voltage test. A test water tank 201 having an upper surface opening stores water tank fresh water Wp. The test water tank 201 has a water tank electrode 241 disposed in the water tank fresh water Wp. The water tank electrode 241 is grounded.

  The work armor 11 serving as a sample is held at a position where the sample clear water Ws is not stored in the tank fresh water Wp by the sample electrode 251 inserted into the hole 12 while the sample clear water Ws is stored. The sample electrode 251 in which the annealed copper wire 252 is bent manually holds the work armor 11 by pressing the work armor 11 from the inside by a force of spreading.

  FIG. 6 is a cross-sectional view schematically showing an enlarged part of a state of a conventional withstand voltage test. More specifically, the position of the work armor 11 in the test water tank 201 is a position where the minimum creepage distance is 3 cm as shown in FIG. The creepage distance is the shortest distance between two points measured on the surface of the insulator (along the outer shape of the insulator). The tester uses a dropper or the like to adjust the liquid level height of the sample fresh water Ws to the liquid level height of the water tank fresh water Wp.

  Returning to the description of FIG. The tester controls the voltage generator 211 to apply a test voltage (for example, 10 kilovolts, 1 minute) to the water tank electrode 241 and the sample electrode 251. When the work armor 11 is not deteriorated and is normal, the work armor 11 having insulation isolates the sample electrode 251 and the water tank electrode 241, so that the inside of the test water tank 201 is in an insulated state. However, when the work armor 11 is deteriorated, dielectric breakdown occurs. In other words, the work armor 11 is destroyed and the insulating state cannot be maintained, and a discharge phenomenon occurs between the sample electrode 251 and the water tank electrode 241 and is conducted.

  In the middle of the annealed copper wire 252, a well-known withstand voltage tester 221 is interposed. When the measured voltage value exceeds the set value due to the discharge between the sample electrode 251 and the water tank electrode 241, the withstand voltage tester 221 sounds a buzzer or turns on the LED to notify the abnormality. Upon receiving an abnormality notification from the withstand voltage tester 221, the tester recognizes that the end voltage test sample includes the work armor 11 that has deteriorated.

  At this time, since the discharge between the sample electrode 251 and the water tank electrode 241 is accompanied by light emission (arc discharge) and a shock wave, the tester can identify the deteriorated work armor 11. Note that the tester can also specify the deteriorated work armor 11 by repeating the withstand voltage test while reducing the number of samples.

JP-A-7-222317 JP-A-8-103018

  In the withstand voltage test, if the position of the work armor 11 is inappropriate, the test is not properly performed. For example, the armor 11 for work (see FIG. 5) has a minimum creepage distance of 3 cm, and the position is appropriate. On the other hand, the work protector 11 for B (see FIG. 5) is at a higher position than the work protector 11 for A. Then, even if the work armor 11 for B is deteriorated, there is a case where dielectric breakdown does not occur in the withstand voltage test. In this case, the tester overlooks the deterioration of the work armor 11.

  Further, the work protector 11 for C (see FIG. 5) is positioned lower than the work protector 11 for A. In other words, the creepage distance of the work armor 11 for C is shorter than the minimum creepage distance. Then, even if C's work armor 11 is normal (not deteriorated), a discharge occurs between the sample electrode 251 and the water tank electrode 241 in the C work armor 11 during the withstand voltage test. Sometimes. Further, the distance between the work arm 11 for D (see FIG. 5) and the work arm 11 for E (see FIG. 5) is much shorter than the distance between the other samples. Then, even if the D work armor 11 and the E work armor 11 are normal, the sample electrode 251 in the D work armor 11 and the E work armor 11 in the E work armor 11 during the withstand voltage test. Discharge may occur between the sample electrode 251 and the sample electrode 251. Due to the occurrence of electric discharge, the tester determines that the normal work armor 11 is the work armor 11 that has been erroneously deteriorated. Furthermore, even if the work armor 11 is normal, the dielectric breakdown may occur, thereby deteriorating the normal work armor 11 that should still be usable.

  Therefore, the tester must adjust the position of the work armor 11. For example, in order to obtain an appropriate creepage distance, the height position of the work armor 11 must be manually adjusted. When there are a plurality of work protectors 11, the tester must manually adjust the interval between the adjacent work protectors 11. That is, the conventional withstand voltage test also has a problem that the position adjustment work of the work armor 11 as a sample becomes complicated.

  An object of the present invention is to appropriately perform a withstand voltage test using an insulating cap (working armor) as a sample without requiring a complicated sample position adjustment operation.

  The sample positioning tool for withstand voltage test according to the present invention is housed in a test water tank, and is protruded from the reference surface by a specified protrusion amount from the water tank electrode in the tank fresh water stored in the test water tank up to the reference surface, and separated from each other by a specified interval. A water-absorbing substrate having an upper surface serving as the reference surface in a withstand voltage test performed by applying a test voltage to a sample electrode in sample fresh water stored up to the reference surface in two or more insulating caps immersed in the water in the water tank; Two or more positioning holes provided on the upper surface of the base body and having the same depth to support the inserted insulating cap on the bottom surface, and the depth of the positioning hole is supported by the bottom surface of the insulating cap Is a depth at which the protruding amount from the reference surface becomes the specified protruding amount, and the positioning holes are arranged at intervals between the insulating caps to be inserted by the specified intervals. It is.

  The sample positioning tool for withstanding voltage test according to the present invention viewed from another aspect is stored in the test water tank, and the water tank electrode stored in the test water tank up to the reference surface is protruded from the reference surface by a specified protrusion amount to each other. It has an upper surface serving as the reference surface in a withstand voltage test performed by applying a test voltage to a sample electrode in sample fresh water stored up to the reference surface on two or more insulating caps that are separated by a specified interval and immersed in the water in the water tank. A water-absorbing base, two or more positioning holes provided on the upper surface of the base and sandwiching the insulating cap to be inserted, and provided at the edge of the positioning hole on the upper surface of the base and have the same height Two or more projecting portions, and the height of the projecting portion is from the reference surface of the insulating cap if the height of the insulating cap sandwiched by the positioning hole is the height of the projecting portion. The height of the projection amount becomes the prescribed amount of projection, the arrangement interval of the positioning hole is disposed interval of separating only the prescribed spacing said insulating cap to be inserted.

  The withstand voltage test apparatus of the present invention comprises the above-mentioned withstand voltage test sample positioning tool, a circuit for applying the test voltage to the water tank electrode and the sample electrode, and an informing unit for informing the result of the withstand voltage test. .

  According to the present invention, only by inserting the insulating cap (working armor) into the positioning hole, the insulating cap is disposed at a specified interval, and the protruding amount from the reference surface of the insulating cap is the specified protruding amount. Therefore, the withstand voltage test using the insulating cap as a sample can be properly performed without requiring a complicated sample position adjustment operation.

It is a perspective view which shows the sample positioning tool for withstand voltage tests with a test water tank. It is sectional drawing which shows a withstand voltage test apparatus typically by making a part into block diagrams. FIG. 5 is a cross-sectional view schematically showing a withstand voltage test apparatus according to a second embodiment, partly in a block diagram. It is a perspective view which shows the armor for work. It is sectional drawing which shows the state of the conventional withstand voltage test typically. It is sectional drawing which expands a part and shows typically the state of the conventional withstand voltage test.

  A first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a perspective view showing a withstand voltage test sample positioning tool 101 together with a test water tank 201. The withstand voltage test sample positioning tool 101 mainly includes a rectangular parallelepiped base 111. The substrate 111 is made of a porous sponge having water absorption. The material of the base 111 is not limited to sponge. For example, the material of the base 111 may be a fiber. In this case, water absorption is exhibited by the porous structure formed by the fibers.

  The withstand voltage test sample positioning tool 101 has a plurality of concave depressions on one surface of the base 111. Hereinafter, the depression of the base body 111 is referred to as a positioning hole 121. The work armor 11 is inserted into the positioning hole 121 with the opening surface 13 facing upward. The positioning holes 121 have the same shape. That is, the positioning hole 121 has the same inner diameter and depth (distance to the bottom surface 122) in all the positioning holes 121.

  The inner diameter of the positioning hole 121 is slightly smaller than the maximum outer diameter of the work armor 11. Therefore, the positioning hole 121 presses the inserted work armor 11. The inner diameter of the positioning hole 121 may be the same as the outer diameter of the work armor 11 or may be larger than the outer diameter of the work armor 11.

  The bottom surface 122 of the positioning hole 121 supports the closed end 15 of the work armor 11 inserted into the positioning hole 121. The positioning hole 121 positions the vertical position of the inserted work armor 11 by the support by the bottom surface 122.

  In the withstand voltage test sample positioning tool 101, six positioning holes 121 are arranged at equal intervals along the longitudinal direction of the substrate 111. In addition, the withstand voltage test sample positioning tool 101 has two rows of equally spaced positioning holes 121. The rows of positioning holes 121 are parallel to each other.

  The withstand voltage test sample positioning tool 101 has an electrode housing hole 151, which is a hole different from the positioning hole 121, in the base 111. The arrangement position of the electrode housing hole 151 is a position close to one end side of the base 111 and is an intermediate position between the two rows of positioning holes 121. The electrode storage hole 151 stores the water tank electrode 241 (see FIG. 2).

  The shape and size of the base body 111 are smaller than the test water tank 201. Therefore, the tester can store the withstand voltage test sample positioning tool 101 in the test water tank 201 opened on the upper surface with the surface on the positioning hole 121 side of the base body 111 as the upper surface. The bottom plate 203 of the test water tank 201 supports the lower surface of the base body 111 accommodated in the test water tank 201.

  In the test water tank 201, transparent glass plates 202 are arranged on four side surfaces. Therefore, the tester can visually recognize the withstand voltage test sample positioning tool 101 stored in the test water tank 201 from the side of the test water tank 201.

  FIG. 2 is a cross-sectional view schematically showing the withstand voltage test apparatus 1 with a part thereof in a block diagram. A test water tank 201 having an upper surface opening accommodates a withstand voltage test sample positioning tool 101. The work armor 11 is inserted into the positioning hole 121 of the withstand voltage test sample positioning tool 101. The test water tank 201 stores water tank fresh water Wp up to the upper surface height position of the base body 111. The work armor 11 inserted into the positioning hole 121 also stores the sample clean water Ws in accordance with the liquid surface height of the water tank clean water Wp. That is, the upper surface of the base 111 accommodated in the test water tank 201 serves as a reference surface for the water tank fresh water Wp and the sample fresh water Ws in the withstand voltage test performed by the withstand voltage test apparatus 1.

  The test water tank 201 is in the water tank fresh water Wp, and the water tank electrode 241 is disposed in the electrode housing hole 151. The water tank electrode 241 is grounded. The work armor 11 is provided with a sample electrode 261. The shape of the sample electrode 261 is a linear shape unlike the shape of the conventional sample electrode 251 (see FIG. 5). The sample electrode 261 may be formed by bending an annealed copper wire 252 in the same manner as the sample electrode 251. However, it is not necessary to hold the work armor 11 on the sample electrode 261.

  A voltage generator 211 is connected to the water tank electrode 241 and the sample electrode 261. The voltage generator 211 includes a voltage application circuit (not shown) that applies a test voltage (for example, 10 kilovolts, 1 minute) to the water tank electrode 241 and the sample electrode 261.

  Here, the bottom surface 122 of the positioning hole 121 according to the present embodiment supports the inserted work armor 11 at a certain height. This height is a height at which the protrusion amount of the work armor 11 from the reference surface becomes the specified protrusion amount in the withstand voltage test performed by the withstand voltage test apparatus 1. That is, the work armor 11 inserted into the positioning hole 121 and supported by the bottom surface 122 has a creeping distance that causes discharge between the sample electrode 261 and the water tank electrode 241 during the withstand voltage test performed by the withstand voltage test apparatus 1. This is the creepage distance to prevent. For example, the minimum creepage distance is 3 cm. And the armor 11 for work which the bottom face 122 supports does not have a too high height position. That is, if the work armor 11 is deteriorated, a dielectric breakdown occurs due to a withstand voltage test performed by the withstand voltage test apparatus 1.

  The work armor 11 inserted into the positioning hole 121 is arranged at a specified interval in the withstand voltage test performed by the withstand voltage test apparatus 1. That is, the discharge between the sample electrodes 261 during the withstand voltage test performed by the withstand voltage test apparatus 1 is prevented.

  Next, a procedure of a withstand voltage test using such a withstand voltage test apparatus 1 will be described. First, the tester houses the withstand voltage test sample positioning tool 101 in the test water tank 201 and inserts the work armor 11 to be a sample into the positioning hole 121. Then, the tester pours the sample clean water Ws into the hole 12 of the work armor 11 inserted into the positioning hole 121. Next, the tester stores the water tank fresh water Wp in the test water tank 201 up to the height position of the upper surface of the base body 111 which is the reference surface. At this time, the tester uses a dropper or the like to adjust the liquid level height of the sample fresh water Ws to the liquid level height of the water tank fresh water Wp. Next, the tester arranges the water tank electrode 241 in the electrode housing hole 151, and arranges the sample electrode 261 in the hole 12 of the work armor 11 inserted into the positioning hole 121. Then, the tester controls the voltage generator 211 to cause the voltage application circuit to apply a test voltage to the water tank electrode 241 and the sample electrode 261. When the work armor 11 that is a sample is deteriorated, dielectric breakdown occurs, and a discharge is generated between the water tank electrode 241 and the sample electrode 261. The withstand voltage tester 221 intervening in the annealed copper wire 252 sounds a buzzer or turns on an LED when the measured voltage value exceeds a set value due to the discharge between the sample electrode 251 and the water tank electrode 241. Then, the abnormality is notified. Upon receiving an abnormality notification from the withstand voltage tester 221, the tester recognizes that the end voltage test sample includes the work armor 11 that has deteriorated. Further, the tester specifies the deteriorated work armor 11 by light emission or shock wave accompanied by discharge.

  At this time, the work armor 11 is supported at a height at which the protruding amount from the reference surface becomes the specified protruding amount, and is disposed at a specified interval. Therefore, during the withstand voltage test, discharge does not occur even though the work armor 11 is normal (not deteriorated). Therefore, the tester is prevented from determining that the normal work armor 11 is the work armor 11 that has deteriorated by mistake, so that the tester can appropriately perform the withstand voltage test. Furthermore, the normal working armor 11 that should still be usable is not deteriorated by the occurrence of erroneous dielectric breakdown. In the withstand voltage test, the tester only needs to insert the work armor 11 into the positioning hole 121 of the withstand voltage test sample positioning tool 101. That is, the tester does not need a complicated position adjustment of the work armor 11.

  Next, a second embodiment of the present invention will be described with reference to FIG. The same portions as those described in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is also omitted.

  FIG. 3 is a cross-sectional view schematically showing a withstand voltage test apparatus 1 according to the second embodiment, partly in a block diagram. Also in the second embodiment, the arrangement interval of the positioning holes 121 is a specified interval in the withstand voltage test performed by the withstand voltage test apparatus 1.

  The tester may perform a withstand voltage test on a work armor whose longitudinal direction is shorter than that of the work armor 11 (hereinafter referred to as a work armor 11 ′). When the withstand voltage test is performed on the work armor 11 ′, the tester may insert the work armor 11 ′ into the positioning hole 121 too much. Then, the creepage distance becomes short, and the withstand voltage test is not properly performed.

  Therefore, the withstand voltage test sample positioning tool 101 according to the second embodiment includes a protrusion 171 integrally with the base 111. As an example, the material of the protruding portion 171 is a sponge having water absorption. The protruding portion 171 is located at an edge portion of each of the plurality of positioning holes 121 and protrudes from the base body 111 by a certain distance in the direction opposite to the depth direction of the positioning holes 121.

  If the upper end position (the position of the opening surface 13) of the work armor 11 ′ inserted into the positioning hole 121 is the height position of the projecting portion 171, the amount of protrusion of the work armor 11 ′ from the reference surface is the withstand voltage. This is the specified protrusion amount in the withstand voltage test performed by the test apparatus 1.

  In the second embodiment, the positioning hole 121 has a shape for sandwiching the work armor 11 ′ inserted into the positioning hole 121. For example, assuming that the work armor 11 ′ has a cylindrical shape, the positioning hole 121 is reduced in diameter toward the bottom surface 122 so as to be narrower than the outer diameter of the work armor 11 ′. The inner wall of the positioning hole 121 is pressed so as to sandwich the closed end of the work protector 11 ′ being inserted, and holds the work protector 11 ′ at an arbitrary height.

  Therefore, the tester can hold the position of the upper end position of the work armor 11 ′ in accordance with the height position of the projecting portion 171 without requiring complicated work. The work armor 11 ′ thus held in position is positioned at a height at which the protrusion amount from the reference surface becomes the predetermined protrusion amount, and is disposed at a predetermined interval. Therefore, during the withstand voltage test, discharge does not occur even though the work armor 11 is normal (not deteriorated). Therefore, the tester is prevented from determining that the normal work armor 11 is the work armor 11 that has deteriorated by mistake, so that the tester can appropriately perform the withstand voltage test. Furthermore, the normal working armor 11 that should still be usable is not deteriorated by the occurrence of erroneous dielectric breakdown.

DESCRIPTION OF SYMBOLS 1 ... Withstand voltage test apparatus 11 ... Work armor (insulation cap)
11 '... Work armor (insulation cap)
DESCRIPTION OF SYMBOLS 101 ... Sample positioning tool for withstand voltage tests 111 ... Base | substrate 121 ... Positioning hole 171 ... Protruding part 201 ... Test water tank 221 ... Withstand voltage tester (notification part)
241 ... Water tank electrode 251 ... Sample electrode Wp ... Water tank fresh water Ws ... Sample fresh water

Claims (4)

Two or more insulating caps that are housed in a test water tank and that are stored in the test water tank up to a reference surface and two or more insulating caps that protrude from the reference surface by a specified amount of protrusion and are spaced apart from each other by a specified distance and immersed in the water in the tank water. A water-absorbing substrate having an upper surface serving as the reference surface in a withstand voltage test performed by applying a test voltage to the sample electrode in the sample fresh water stored up to the reference surface;
Two or more positioning holes provided on the top surface of the base body and having the same depth to support the insulating cap to be inserted on the bottom surface;
With
The depth of the positioning hole is a depth at which the protruding amount from the reference surface of the insulating cap supported by the bottom surface becomes the specified protruding amount,
The arrangement interval of the positioning holes is an arrangement interval for separating the inserted insulating cap by the specified interval.
Sample positioning tool for withstanding voltage test. Two or more insulating caps that are housed in a test water tank and that are stored in the test water tank up to a reference surface and two or more insulating caps that protrude from the reference surface by a specified amount of protrusion and are spaced apart from each other by a specified distance and immersed in the water in the tank water. A water-absorbing substrate having an upper surface serving as the reference surface in a withstand voltage test performed by applying a test voltage to the sample electrode in the sample fresh water stored up to the reference surface;
Two or more positioning holes provided on the upper surface of the substrate and sandwiching the insulating cap to be inserted;
Two or more protrusions provided at an edge of the positioning hole on the upper surface of the base body and having the same height;
With
The height of the protruding portion is a height at which the protruding amount of the insulating cap from the reference surface is the specified protruding amount if the height of the insulating cap sandwiched by the positioning hole is the height of the protruding portion. And
The arrangement interval of the positioning holes is an arrangement interval for separating the inserted insulating cap by the specified interval.
Sample positioning tool for withstanding voltage test. The base is made of sponge having water absorption,
The sample positioning tool for a withstand voltage test according to claim 1 or 2. A withstand voltage test sample positioning tool according to any one of claims 1 to 3;
A circuit for applying the test voltage to the water tank electrode and the sample electrode;
An informing unit for informing a result of the withstand voltage test;
Withstand voltage test device comprising.

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