JPH09127182A - Insulation test method for high voltage electric apparatus and insulation tester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect even a minute defective void in a short time by convergently irradiating a test piece with a radiant ray in a state where test voltage is applied to it, and measuring its partial discharge. SOLUTION: A radiant ray radiating means 20 is composed of a radiant ray source 21, a converging means 22, and a radiant ray source support base 23. The converging means 22 for spot-shapedly converging the radiant ray is composed of a lead plate which is 10mm in thickness and has a through hole being 1mm in bore, and the radiant ray source support base 23 can move the positions of the radiant ray source 21 and of the converging means 22 vertically and laterally so that the radiant ray radiated from the radiant ray source 21 may be cast on each spot of a test piece 10. In the case of an insulation test, the radiant ray source 21 is moved vertically and laterally with a fixed test voltage being applied to radiate the radiant ray toward an optional position of the test piece 10 for measuring partial discharge, and a partial discharge level and a defective position can be specified on the irradiation position with the radiant ray and the measured value of the partial discharge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchgear connected to an electric power system, a transformer such as a transformer, or an insulator of a high voltage electric device covered with a solid insulator such as a resin such as an electromagnet. The present invention relates to an insulation test method and an insulation test apparatus for detecting existing defects.

[0002]

2. Description of the Related Art A conventional high voltage electric device covered with a solid insulator has an insulation test method in which a predetermined voltage is applied to measure a partial discharge in order to detect defects such as voids existing inside the insulator. It is used regularly. However, minute defects such as voids existing in the solid insulator may show a considerable long time delay before partial discharge occurs even when a high voltage is applied. For example, IEEJ Transactions A, 104
Vol. 11, No. 11, November 1984, P129, "Time delay of discharge in spherical void",
In the initial test of the product, it was reported that defects could not be detected due to the time delay phenomenon of partial discharge due to voids, and partial discharge occurred inside the insulator after the product was operated, eventually leading to dielectric breakdown. There is.

As a means for increasing the detection sensitivity of partial discharge, Japanese Patent Application Laid-Open No. 2-120679 discloses a method for detecting a defect in a power cable connecting portion shown in FIG. In FIG. 11, 1 is a power cable, 2 is a conductor of the power cable, 3
Is an internal semiconductive layer, 4 is an insulating layer, 5 is an external semiconductive layer, 6 is a high resistance part, 7 is a detection impedance, 8 is a partial discharge measuring instrument, and 9 is an X-ray generating means.

Usually, the insulation test of a power cable is carried out by applying a DC voltage because of its large capacitance. The conductor 2 of the power cable 1 is connected to a DC power source, a DC voltage is applied between the conductor 2 and the outer semiconductive layer 5, and a DC electric field is applied to the insulating layer 4. A partial discharge measuring device 8 is connected to the outer semiconductive layer 5 via a detection impedance 7, and a high resistance portion 6 is interposed between the outer semiconductive layer 5 and the exterior of the power cable 1, so that insulation is achieved. The current flowing through the layer portion flows into the partial discharge measuring instrument 8 via the detection impedance 7, and when the partial discharge occurs in the insulating layer 4, the partial discharge measuring instrument 8 measures the partial discharge.

Partial discharge was measured in a state in which a void having a diameter of 200 μm was formed on the inner semiconductive layer 3 at the connection portion of a 275 kV power cable, and the partial discharge was measured at a test voltage of 500 kV and 0.5 pC. Partial discharge was detected. Next, at the position of 600 mm apart from the X of the conductor 2,
When a partial discharge test was performed by irradiating X-rays from the line generator 9 (X-ray irradiation conditions were a tube voltage of 100 kV and a tube current of 25 mA), an extremely high frequency of partial discharges that could be clearly distinguished from noise was detected from 450 kV. An example is shown.

This means that if there are minute voids in the solid insulator, even if a partial discharge test is carried out in the shipping test at the factory after the product is assembled, the existence of initial electrons is necessary for the partial discharge to occur. However, the minute voids trapped in the atmosphere do not reach the energy such as cosmic rays and ultraviolet rays in the outside air, so even if a test voltage is applied, there are no initial electrons that lead to partial discharge, resulting in partial discharge. In some cases, it may not be reached, and there is a time delay until partial discharge, so it cannot be detected by a test performed with a limited voltage application time. In such a case, it is shown that irradiation with X-rays excites the gas in the voids, partial discharge occurs within the test time, and it becomes possible to detect minute voids.

[0007]

As described above, when there is a minute void, the voltage application time is short in the conventional partial discharge after product assembly, so it cannot be detected and it is shipped as a non-defective product. There was a problem that it could lead to dielectric breakdown. Further, in the partial discharge test performed by irradiating the DUT with X-rays like the power cable connecting portion disclosed in JP-A-2-120679, X-rays are entirely radiated, so There is also a problem in that it is not possible to specify the location of the discharge.

The present invention has been made to solve the above-mentioned problems, and it is possible to detect even a minute defect void in a partial discharge test at the time of assembling a product in a factory, and to identify the position thereof. It is intended to provide a partial discharge test method for equipment and a partial discharge test apparatus for high-voltage electric equipment for performing the test.

[0009]

According to a first aspect of the present invention, there is provided an insulation test method for high-voltage electrical equipment, which comprises connecting a voltage applying means for applying a test voltage to a DUT and a partial discharge measuring means, and performing a test. Measuring partial discharge by moving the irradiation position up, down, left and right by a radiation irradiation means configured to converge irradiation to be applied and selectively irradiate locally in a voltage applied state. Is.

According to a second aspect of the present invention, there is provided an insulation test method for high-voltage electrical equipment, which comprises connecting a voltage applying means for applying a test voltage to a device under test and a partial discharge measuring means, and irradiating in a test voltage applied state. The X-ray irradiating means configured to converge the X-rays to be selectively irradiated locally and irradiate the X-rays vertically and horizontally to irradiate the X-rays and measure the partial discharge.

According to a third aspect of the present invention, there is provided an insulation test method for a high-voltage electric device, wherein a voltage applying means for applying a test voltage to the DUT and a partial discharge measuring means are connected, and the DUT can be rotated. The radiation irradiation device having the focusing means is moved up and down and left and right while being placed on a rotary table and rotated and the test voltage is applied, and the converged radiation is selectively applied to the local area of the DUT, and the radiation is irradiated. The position of the defect and the level of the size of the defect are specified based on the irradiation position of and the measured partial discharge level.

According to a fourth aspect of the present invention, there is provided an insulation test apparatus for high-voltage electrical equipment, which comprises a voltage applying means for applying a test voltage to a DUT, a partial discharge measuring means for measuring a partial discharge, and a radiation irradiation for radiating radiation. The radiation irradiating section of the radiation irradiating means includes a radiation converging means, and the irradiation position is attached to a moving means capable of moving up and down, left and right,
The test object is configured so that it can be selectively irradiated locally.

According to a fifth aspect of the present invention, there is provided an insulation test apparatus for high-voltage electrical equipment, which comprises a voltage applying means for applying a test voltage to a DUT, a partial discharge measuring means for measuring a partial discharge, and X.
X-ray irradiation means for irradiating X-rays, and X of the X-ray irradiation means
The radiation irradiator has X-ray focusing means, and the irradiation position is up and down.
It is attached to a moving means that can move to the left and right, and is configured to be able to selectively irradiate the test object locally.

According to a sixth aspect of the present invention, there is provided an insulation test apparatus for high-voltage electrical equipment, which comprises voltage applying means for applying a test voltage to a DUT, partial discharge measuring means for measuring partial discharge, and radiation irradiation for irradiating radiation. The radiation irradiating means has a converging means for converging the radiation in a spot shape, is attached to a moving means capable of moving the irradiation position up and down, left and right, and selectively irradiates the DUT locally. It was done.

According to a seventh aspect of the present invention, there is provided an insulation test apparatus for high-voltage electrical equipment, which comprises a voltage applying means for applying a test voltage to a DUT, a partial discharge measuring means for measuring a partial discharge, and a radiation irradiation for radiating radiation. The radiation irradiating means has a converging means for converging the radiation, is attached to a moving means capable of moving the irradiation position vertically and horizontally, and is provided with a display means capable of displaying the irradiation position of the radiation in a coordinated manner. It is a thing.

According to an eighth aspect of the present invention, there is provided an insulation test apparatus for high-voltage electrical equipment, wherein voltage application means for applying a predetermined test voltage to an object to be tested and radiation is converged in a test voltage applied state and locally. Radiation irradiation means for selectively irradiating, moving according to a preset program, and outputting an irradiation position signal in which the irradiation position is coordinately displayed, measuring partial discharge, partial discharge measurement value and the above-mentioned radiation irradiation And partial discharge measuring means for recording the irradiation position signal output from the means.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. In order for a partial discharge to occur in a solid insulator, the existence of initial electrons is necessary.In the case of a minute void, even if a test voltage is applied, initial electrons are generated and until a partial discharge occurs. As described above, a certain amount of time has to be passed, and partial voids are not generated during the test time in the normal insulation test, and defect voids may not be detected. In the insulation test, the material under test is irradiated with X-rays to excite defect voids existing in the insulating member to promote the generation of partial discharge, and it is possible to detect minute defect voids that cannot be detected by a normal insulation test. -120679 gazette.

FIG. 1 is a circuit diagram of a test for confirming the effect of X-ray irradiation in an insulation test for measuring partial discharge. In the figure, 10 is a device under test, 11 is a test voltage applying means, 12 is a suppression impedance for suppressing the current of the test circuit, 13 is a coupling capacitor, 14 is a detection impedance, 15 is a partial discharge measuring instrument, and 16 is a partial discharge measurement. It is a means and comprises a suppression impedance 12, a coupling capacitor 13, a detection impedance 14, and a partial discharge measuring device 15.
Reference numeral 18 is an X-ray generation source, and 19 is a focusing means for linearly focusing the X-rays, which has a structure in which a 1 mm hole is formed in the center of a lead plate having a thickness of 10 mm. The DUT 10 is an insulating plate having a thickness of 8 mm, a void having a diameter of 1 mm is formed inside, and electrodes are attached to the upper and lower surfaces.

FIG. 2 shows the results of measuring partial discharge by applying a voltage without irradiating the circuit of FIG. 1 with X-rays. The vertical axis of FIG. 2 is a value obtained by dividing the number of times showing a delay of time delay or more tested under the same condition by the total number of tests, and the horizontal axis is time. The test voltage is a Laue plot of the time delay until AC discharge (60 Hz) of 20 kV and 30 kV is applied and a partial discharge of 10 pC or more occurs. In this test, as shown in the figure, 18 to 148 minutes at 30 kV application, 20 kV
The application causes a time delay of 22 to 220 minutes. As described above, the partial discharge of the minute void enclosed in the solid insulator has a very long time delay after the voltage is applied. In the atmosphere, there is a high probability that molecules will be excited by energy such as cosmic rays and ultraviolet rays and free electrons will exist.Therefore, the time delay is short, but with a sealed void, there is very little external excitation action. The discharge is delayed.

FIG. 3 shows the characteristics obtained when the voltage drops after the partial discharge occurs, for example, when the partial discharge occurs 18 minutes after applying 30 kV. The horizontal axis of FIG. 3 is the applied voltage, and the vertical axis is the number of partial discharges of 10 pC or more. It can be seen that the number of occurrences of partial discharge decreases as the applied voltage decreases.

Next, FIG. 4 shows characteristics when X-rays are irradiated to the void portion in the DUT immediately after applying an arbitrary voltage within 30 kV. The partial discharge extinction voltage is about 11 kV, and at a voltage above this value, partial discharge occurs immediately after X-ray irradiation, and the initial electrons for partial discharge are supplied by the X-ray irradiation, and there is no time delay. I know that Further, FIG. 5 shows a partial discharge pulse generation state when a voltage of 15 kV is applied to the sample and the X-ray irradiation is laterally moved to the spherical void portion to irradiate the portion having no void. In this case, a significant difference is found in the discharge charge between the voided portion and the voidless portion.

The diameter of the test object used in this test is 1
The theoretical partial discharge inception voltage of the 8 mm insulating plate having a void of mm is about 19 kV, but the results of the partial discharge test of X-ray irradiation are shown in FIG. When the X-ray is irradiated, the partial discharge inception voltage is 11 kV, and the partial discharge is measured at a voltage lower than the theoretical value of the partial discharge inception voltage of 19 kV. This suggests that the insulation of the high-voltage electrical equipment can be tested by irradiating it with X-rays to set the test voltage of the insulation test for detecting voids to a voltage lower than the normal test voltage. Therefore, it is possible to reduce the damage of the product by lowering the test voltage during the shipping test of the product.

The X-ray was used as the radiation in the above experiment, but it is only necessary that the initial electrons can be generated in the gas body in the void, and the same effect can be obtained with other radiation.

In high-voltage electrical equipment composed of solid insulation, a partial discharge test is indispensable for detecting defects (voids etc.) inside the insulating material, and even irradiation of radiation causes a short test time for minute defects. Although it can be detected by, it is not possible to specify the position where the defect exists if the entire DUT is irradiated.

This Embodiment 1. Is an insulation test method and its testing device that can reliably detect internal defects of high-voltage electrical equipment composed of solid insulation by applying voltage for a short time, and specify the position of the defects. The configuration is shown in FIG. Show. In the figure, 10 to 16 are the same as the confirmation test of FIG. Reference numeral 20 is a radiation irradiating means, 21 is a radiation source, and 22 is a converging means for converging the radiation in a spot shape. Like the converging means 19 of FIG. 1, a 1 mm through hole is formed in a lead plate having a thickness of 10 mm. It is a composition. Reference numeral 23 denotes a radiation source irradiation table configured to move the positions of the radiation source 21 and the focusing means 22 vertically and horizontally so that the irradiation position of the radiation emitted from the radiation source can be locally irradiated to the DUT, The radiation source 21 and the focusing means 22 are attached, and the radiation irradiation means 20 includes the radiation source 21 and the focusing means 22.
And a radiation source support 23.

In the insulation test, the radiation source is moved up and down and to the left and right while a predetermined test voltage is applied to irradiate the radiation to an arbitrary position on the DUT, the partial discharge is measured, and the radiation irradiation position and the partial radiation are measured. The partial discharge level and the position of the defect can be specified by the measured value of the discharge. The same effect can be obtained by using an X-ray generator as the radiation source.

Embodiment 2. In FIG. 7, the DUT 31 is placed on the rotary table 32, and the radiation irradiation means 20 is the same as that in the case of FIG. In this case, the DUT 31 is rotated to irradiate radiation.

When the inside is made of a material such as a copper material that does not easily transmit radiation, the radiation is irradiated to the entire body by rotating and irradiating, so that defects are not missed. Also in this case, the same effect can be obtained by using an X-ray generator as the radiation source.

Embodiment 3 FIG. 8 shows a situation where radiation is applied to a coil such as an electromagnet. 41 is an electromagnet coil, and the AA cross section is shown in FIG. As shown in FIG. 9, it is assumed that the conductor 42 is embedded inside, and only by irradiating the radiation from the front side, a portion which becomes a blind is formed by the inner conductor 42 and the defect void is not detected. 8 and 9 show an example of irradiating from the lateral direction when the inner conductor is formed in layers.

When the internal conductors are formed in layers as described above, the radiation is moved by moving it from the horizontal direction to the vertical direction. After the radiation is applied from one direction, the radiation source is moved in the opposite direction. By moving or changing the direction of the coil and irradiating with radiation, the blind portion disappears and the defect void is not missed. Also in this case, the same effect can be obtained by using an X-ray generator as the radiation source.

Embodiment 4 FIG. FIG. 10 shows a state in which an insulation test is performed on the insulation spacer of the gas insulation device. In the figure, 51 is an insulating spacer which is the DUT, 52 is a central conductor, 53 is a cap, and the radiation irradiating means 20 is the same as above.

In this case, the object to be tested is circular, a conductor such as a copper material is present in the center, and even if radiation is radiated from the side surface, a blind portion is most likely to remain around the center where defect voids are most likely to remain. By arranging and irradiating the radiation irradiation means in the axial direction of the DUT, the blind portion is almost eliminated, and the defect void is not overlooked. Also in this case, the same effect can be obtained by using an X-ray generator as the radiation source.

Embodiment 5 FIG. Embodiment 5 FIG. Is a program that is preset to scan the movement of the radiation source up and down, left and right when irradiating by moving the radiation source up and down, left and right, and the irradiation position signal is coordinately moved up and down, for example. Direction, right and left direction is added as an irradiation position signal output means for outputting as a signal that is coordinately displayed, and the irradiation position signal is output to the partial discharge measuring means, and the partial discharge measurement value and the irradiation position are displayed in the partial discharge measuring means. It is configured to record.

According to this structure, in the insulation test, the means for irradiating the radiation can be automatically operated, so that the insulation test can be performed without paying attention to the radiation. Also in this case, the same effect can be obtained by using an X-ray generator as the radiation source.

[0035]

The insulation test method for a high-voltage electric device according to claim 1 of the present invention converges the radiation and moves the irradiation position vertically and horizontally while the test voltage is applied to the DUT. Since even a small defect void can be detected in a short time, the defect void position can be specified by comparing the radiation irradiation position with the partial discharge measurement value. Can be done.

According to a second aspect of the present invention, there is provided an insulation test method for a high-voltage electric device, wherein an irradiation X-ray is converged and a irradiation position is moved vertically and horizontally while a test voltage is applied to a DUT. Since the irradiation is performed and the partial discharge is measured, even minute defect voids can be detected in a short time, and the position of the defect void can be specified by comparing the irradiation position of radiation with the measured partial discharge value. You can

According to a third aspect of the present invention, there is provided an insulation test method for a high-voltage electric device, wherein the DUT is placed on a rotatable turntable and rotated, and a test voltage is applied to the DUT,
Since the X-rays to be irradiated are converged and the irradiation position is moved up and down, left and right, and the irradiation is performed to measure the partial discharge, even a minute defect void close to the internal conductor can be reliably detected in a short time. The position of the defect void can be specified by comparing the irradiation position of the radiation with the measured value of the partial discharge.

According to a fourth aspect of the present invention, there is provided an insulation test apparatus for high-voltage electrical equipment, comprising a voltage applying means for applying a test voltage to a DUT, a partial discharge measuring means for measuring a partial discharge, and a radiation irradiation for radiating radiation. The radiation irradiating section of the radiation irradiating means is provided with a radiation converging means, is attached to a moving means capable of moving the irradiation position up and down, left and right, and selectively irradiates the DUT locally. Since it is assumed that even a minute defect void can be detected reliably in a short time, the position of the defect void can also be specified by comparing the radiation irradiation position with the partial discharge measurement value. .

According to a fifth aspect of the present invention, there is provided an insulation test apparatus for high-voltage electrical equipment, comprising a voltage applying means for applying a test voltage to a DUT, a partial discharge measuring means for measuring partial discharge, and X.
X-ray irradiation means for irradiating X-rays, and X of the X-ray irradiation means
The radiation irradiator is provided with X-ray focusing means so that the irradiation position is up and down,
Since it is configured to be attached to a moving means that can be moved to the left and right and to be selectively irradiated locally on the DUT,
Even a minute defect void can be reliably detected in a short time, and the position of the defect void can also be specified by comparing the radiation irradiation position with the partial discharge measurement value.

According to a sixth aspect of the present invention, there is provided an insulation test apparatus for high-voltage electrical equipment, comprising a voltage applying means for applying a test voltage to a DUT, a partial discharge measuring means for measuring a partial discharge, and a radiation irradiation for radiating radiation. The radiation irradiating means has a converging means for converging the radiation in a spot shape, is attached to a moving means capable of moving the irradiation position up and down, left and right, and selectively irradiates the DUT locally. Since it is assumed that even a minute defect void can be detected reliably in a short time, the position of the defect void can also be specified by comparing the radiation irradiation position with the partial discharge measurement value. .

According to a seventh aspect of the present invention, there is provided an insulation test apparatus for high-voltage electrical equipment, comprising a voltage applying means for applying a test voltage to a DUT, a partial discharge measuring means for measuring a partial discharge, and a radiation irradiation for radiating radiation. The radiation irradiating means has a converging means for converging the radiation, is attached to a moving means capable of moving the irradiation position vertically and horizontally, and is provided with a display means capable of displaying the irradiation position of the radiation in a coordinated manner. Since it is possible to detect even minute defect voids in a short time, the irradiation position of radiation can be displayed accurately in a coordinate manner, and defect voids can be detected by comparing partial discharge measurement values. The position of can be specified with certainty.

An insulation test apparatus for high-voltage electrical equipment according to an eighth aspect of the present invention is a voltage application means for applying a predetermined test voltage to a device under test. Radiation irradiation means for selectively irradiating, moving according to a preset program, and outputting an irradiation position signal in which the irradiation position is coordinately displayed, measuring partial discharge, partial discharge measurement value and the above-mentioned radiation irradiation Since it comprises the partial discharge measuring means for recording the irradiation position signal output from the means, the DUT is automatically irradiated with the radiation, and even a minute defect void can be reliably detected in a short time. At the same time, the irradiation position of the radiation is accurately displayed coordinately, and the position of the defect void can be specified accurately by comparing with the partial discharge measurement value.

[Brief description of the drawings]

FIG. 1 is a test circuit diagram for confirming the effect of X-ray irradiation in an insulation test for measuring partial discharge of a device under test.

FIG. 2 is a characteristic diagram showing the time until a partial discharge occurs when a test voltage is applied to the DUT.

FIG. 3 is a generation characteristic of a partial discharge pulse when a test voltage of 30 kV is applied to the DUT and the voltage drops.

FIG. 4 is a diagram illustrating a test voltage of 30 k when the DUT is irradiated with X-rays.
It is a generation characteristic of a partial discharge pulse after applying a voltage up to V.

FIG. 5 is a diagram showing a discharge charge generation state when X-rays are irradiated to a void portion of a DUT and a position displaced from the void.

FIG. 6 is an explanatory diagram of a test circuit and a radiation irradiating means for an insulation test according to the present invention.

FIG. 7 is an explanatory diagram of an insulation test situation in which an object to be tested is placed on a rotary table, rotated, and irradiated with X-rays.

FIG. 8 is an explanatory diagram of an insulation test situation in which the DUT is an electromagnet coil.

FIG. 9 is a sectional view of an electromagnet coil.

FIG. 10 is an explanatory diagram of an insulation test status of the gas-insulated switchgear.

FIG. 11 is a diagram illustrating a conventional insulation test situation performed by irradiating X-rays.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 DUT, 11 Test voltage applying means, 12 Suppression impedance, 13 Coupling capacitor, 14 Detection impedance, 15 Partial discharge measuring instrument, 16 Partial discharge measuring means, 18 X-ray generation source, 19 Converging means, 20
Radiation irradiation means, 21 Radiation source, 22 Radiation focusing means, 23 Moving means, 31 DUT, 32 Rotating table,
41 test object, 42 inner conductor, 51 insulating spacer, 52 center conductor, 53 end cap, 54 container.

Claims (8)

[Claims] 1. A radiation configured to connect a voltage applying means for applying a test voltage to a DUT and a partial discharge measuring means, converge radiation under a test voltage applied state, and selectively irradiate locally. An insulation test method for high-voltage electrical equipment that measures the partial discharge by irradiating the DUT with radiation by moving the irradiation position up and down, left and right by the irradiation means. 2. The insulation test method for high-voltage electrical equipment according to claim 1, wherein the radiation irradiation means is an X-ray irradiation means. 3. An object to be tested is placed on a rotatable turntable,
The irradiation position of the radiation irradiation device having the converging means is moved up and down, left and right, and the converged radiation is selectively irradiated locally on the DUT, and the defect position is determined by the irradiation position of the radiation and the measured partial discharge level. And an insulation test method for high-voltage electrical equipment according to claim 1 or 2, wherein the size level of the defect is specified. 4. A radiation applying unit for applying a test voltage to a device under test, a partial discharge measuring unit for measuring partial discharge, and a radiation irradiating unit for irradiating radiation, wherein the radiation irradiating section of the radiation irradiating unit converges the radiation. An insulation test apparatus for high-voltage electrical equipment, comprising: a means for moving the irradiation position up and down, left and right, and configured to selectively irradiate a test object locally. 5. The insulation test apparatus for high voltage electrical equipment according to claim 4, wherein the radiation irradiating means is an X-ray irradiating means. 6. The insulation test apparatus for high-voltage electrical equipment according to claim 4, wherein the radiation converging means of the radiation irradiating means is formed so as to be capable of irradiating in a spot shape. 7. The radiation irradiating means is provided with a display means capable of coordinately displaying the irradiation position of the radiation irradiating the DUT. Insulation test equipment for high-voltage electrical equipment as described in. 8. A voltage applying means for applying a predetermined test voltage to a device under test, which converges radiation in a test voltage applied state,
It is configured to selectively irradiate the DUT locally, moves the irradiation position by a preset program, and outputs the irradiation position signal that displays the irradiation position coordinately. An insulation test apparatus for high-voltage electrical equipment, comprising: a partial discharge measurement value and a partial discharge measurement means for recording an irradiation position signal output from the radiation irradiation means.