JP3080313B2 - Insulation degradation detector for electrical equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an insulation deterioration detector for electric equipment.

[Conventional technology]

The measurement of the frequency spectrum distribution of the electromagnetic wave generated by the partial discharge is discussed in IEEJ Transactions A, Vol. 109, No. 3, 1989, pp. 103 to 110.

Further, Japanese Patent Application Laid-Open No.
No. 74 publication.

[Problems to be solved by the invention]

In electrical equipment, organic insulating materials such as epoxy resin, vinyl chloride resin, phenol resin, and polyester resin are used as the constituent insulating materials. Organic insulating materials used in the atmosphere gradually degrade with the occurrence of partial discharge, causing a phenomenon leading to dielectric breakdown. Since this phenomenon causes a dielectric breakdown accident of electric equipment, detecting the occurrence of deterioration of the insulating material is effective for preventing the dielectric breakdown accident.

Atmospheric partial discharges can be broadly classified into discharges without material degradation, ie, non-degradable discharges, and discharges with material degradation, ie, degradable discharges. That is, a discharge in the air at the end of the metal electrode or a partial discharge that does not cause material deterioration on the surface is a non-deteriorating discharge, and a discharge accompanied by carbonized black tracking on the surface or a discharge that produces a trace of a tree is a deteriorating discharge.

In the above-mentioned known example, a method of electrically discriminating these two discharges is unknown. In addition, there is a disadvantage that the electromagnetic wave detection is liable to be hindered by spatial electromagnetic noise.

The present invention has been made in view of the above points, and an object of the present invention is to provide an insulation deterioration detector for electrical equipment that can detect insulation deterioration by discriminating non-degradable discharge and degradable discharge. Is what you do.

[Means for solving the problem]

That is, the present invention relates to an insulation deterioration detector for an electric device that detects insulation deterioration of an electric device, wherein the insulation deterioration detector detects an electromagnetic wave due to partial discharge of an insulating material used in the electric device. A signal storage processing unit that processes a signal detected by the electromagnetic wave detector to determine an insulation deterioration state, wherein the determination of the insulation deterioration state of the signal storage processing unit is performed by a high-frequency electric discharge due to partial discharge of the insulating material. frequency spectrum of the signal, a continuous spectrum from a specific low frequency to the frequency f ₀ in the middle of the 300~400MHz band and the case of the spectral distribution as the signal non-detection in the frequency f ₀ or more frequency bands, insulation deterioration Is determined to be a non-degradable discharge with no
In the case where the frequency spectrum distribution is ₀ to 1200 MHz and is higher than the frequency f0, it is determined that the discharge is degraded due to insulation deterioration, thereby achieving the intended purpose.

Further, in this case, the electromagnetic wave detector is formed so as to detect an electromagnetic wave of 0 to 1.5 GHz, and the signal storage processing unit performs a frequency spectrum obtained by obtaining a detection signal of the electromagnetic wave detector via a spectrum analyzer. Is processed to make the determination. Further, the electromagnetic wave detector, which was as comprises a low-frequency detector having a frequency band of 0 to the frequency f _0, and a high-frequency detector with a frequency band of the frequency f ₀ ~1500MHz is there.

Further, the electromagnetic wave detector has a pulse frequency meter indicating the number of pulses generated per unit time on the output side of the low-frequency detection unit, and is configured to output a caution signal when the output value exceeds a certain value. A pulse counter is provided on the output side of the high-frequency detection unit, and a danger signal is output when the output value exceeds a predetermined value set separately from the predetermined value. Further, the electromagnetic wave detector is formed so as to have antennas arranged inside and outside the housing of the electric device, and the electromagnetic wave frequency spectrum detected by the antenna arranged inside and the antenna arranged outside. The external electromagnetic noise is removed by calculating the difference in intensity from the electromagnetic wave frequency spectrum detected in step (1).

Further, the present invention provides an insulation deterioration detector for an electric device for detecting insulation deterioration of an electric device, wherein the insulation deterioration detector detects an electromagnetic wave due to partial discharge of an insulating material used in the electric device. A signal storage processing unit that processes a signal detected by the electromagnetic wave detector to determine an insulation deterioration state; and a gas detector that detects carbon dioxide and ozone gas inside a housing of the electric device, the determination of the insulation degradation state of the storage unit, the frequency spectrum of the high frequency electric signal by the partial discharge of the insulating material, a continuous spectrum from a specific low frequency to the frequency f ₀ in the middle of the 300~400MHz band, and the frequency for spectral distribution as the signal non-detection at f ₀ or more frequency bands, it is determined that no deterioration discharge without insulation deterioration, and the upper limit frequency of the continuous spectrum 700 If becomes 1200MHz high frequency spectrum distribution from the frequency f _0, insulation deterioration is determined that the deterioration resistance discharge occurs, and the detection of the frequency spectrum with the frequency f ₀ above band component, the gas detector The re-confirmation of the degradable discharge is performed by the detection of the carbon dioxide and ozone gas by the gas detector.

An insulation deterioration detector for an electrical device for detecting insulation degradation of an electrical device, wherein the insulation degradation detector detects an electromagnetic wave due to partial discharge of an insulating material used in the electrical device; A signal storage processing unit that processes a signal detected by the detector to determine an insulation deterioration state, wherein the signal storage processing unit includes a non-degradable discharge frequency spectrum without tracking and a degradable discharge that forms tracking. Of the frequency spectrum detected by the electromagnetic wave detector, the closest spectrum among the pre-stored frequency spectra is calculated by the neural network operation device, and the In this case, it is determined whether the electric discharge is a degradable discharge or a degradable discharge.

In this case, a representative example of the frequency spectrum of the degraded discharge in which the tracking is formed is a frequency spectrum when black tracking carbonized on the surface of the insulating material occurs.

[Action]

The provision of the above means makes it possible to distinguish between non-degradable discharge and degradable discharge, and to detect insulation deterioration due to these non-degradable discharge and degradable discharge.

Non-degradable discharge and degradable discharge were studied for organic insulating materials. As a result, the frequency spectrum distribution of the non-deteriorating discharge is 0 to 300M as shown in FIG. 13 in which voltage is plotted on the vertical axis and frequency is plotted on the horizontal axis.
Hz is a continuous spectrum in the frequency band, and the upper limit frequency (specific frequency) of the frequency spectrum of the non-degradable discharge ₀
Revealed that it is between 300 and 400 MHz. The portion where there is no change in height in the figure, that is, the level up to 0.2 mV, is the background noise that appears when no power is applied. Naturally, in each frequency region of the spectrum distribution, when the level is lower than the background noise. Has no spectrum, and in the above case there is a spectrum.

On the other hand, as shown in FIG. 14 in which the frequency spectrum distribution of the carbonizing discharge that caused black tracking carbonized on the material surface shows the voltage on the vertical axis and the frequency on the horizontal axis, as shown in FIG. It became a continuous spectrum in the frequency band of 0 to 1200 MHz, and it was clarified that the upper limit frequency of the frequency spectrum of the degradable discharge was between 700 and 1200 MHz.

From the results of this study, in the present invention, the frequency spectrum of the high-frequency electric signal due to the partial discharge of the insulating material used in the electrical equipment is a continuous spectrum from low frequency to a specific frequency _{0 in} the middle of the 300 to 400 MHz band, and ₀ is more than in the case of spectral distribution as the signal non-detection in the frequency band determined that no deterioration discharge no insulation degradation, if the upper limit frequency of the continuous spectrum of the high frequency spectrum distribution from 700~1200MHz Natsute ₀ deteriorated insulation It was determined that the degraded discharge occurred. By doing so, it is possible to provide an insulation deterioration detector for electric equipment that can detect insulation deterioration by discriminating non-deteriorating discharge and deteriorating discharge.

〔Example〕

Hereinafter, the present invention will be described based on the illustrated embodiments.
FIG. 1 shows an embodiment of the present invention. As shown in the figure, an insulation deterioration detector is arranged inside an electric equipment housing (hereinafter, referred to as a housing) 1 and an antenna for detecting partial discharge electromagnetic waves (hereinafter, referred to as an antenna) forming an electromagnetic wave detector. 2) An amplifier 3, and a signal storage processing output unit 5 connected to the amplifier 3 via a spectrum analyzer 4. The frequency spectrum is a continuous spectrum from a low frequency up to a specific frequency _{0 in} the middle of the 300 to 400 MHz band, and in the case of a spectrum distribution in which no signal is detected in a frequency band of ₀ or more, a non-degradable discharge without insulation deterioration is used. In the case where the upper limit frequency of the continuous spectrum is 700 to 1200 MHz and the frequency spectrum distribution is higher than ₀ , it is determined that the discharge is deteriorating due to insulation deterioration. By doing so, the non-degradable discharge and the degradable discharge can be distinguished, and the insulation deterioration due to the non-degradable discharge and the degradable discharge can be detected. It is possible to obtain an insulation deterioration detector of an electric device which is capable of detecting insulation deterioration by discriminating discharge from electric discharge.

That is, electric equipment such as a closed switchboard is housed inside the housing 1. An antenna 2 is arranged inside the housing 1 to suppress noise-causing radio waves outside the housing, and to detect electromagnetic waves at a short distance from the discharge occurrence position. The antenna 2 may be a rod antenna for detecting electromagnetic waves, a wire loop for detecting a high-frequency magnetic field, ie, an inductive probe, or an insulating thin film float electrode for detecting a high-frequency electric field, ie, a capacitive probe. Band electromagnetic waves can be detected.

The signal detected by the antenna 2 is amplified by the amplifier 3 having a flat signal amplification characteristic over 0 to 1.5 GHz.
The frequency spectrum of the output signal of the amplifier 3 is measured by the spectrum analyzer 4. The signal storage processing output section 5 stores the measurement data, performs signal processing for determining whether the measurement data is non-degradable discharge or degradable discharge, and outputs the determination result.

As a result, as shown in FIGS. 13 and 14 described above, the spectrum is detected in the band of 0 to 300 MHz in the non-deteriorating discharge, and the spectrum is detected in the band of 0 to 1200 MHz in the deteriorating discharge. . In addition, as described above, 0.2 m
Levels up to V are background noises appearing when no power is applied. If the background noise is higher than this, spectrum detection is performed, and in the following cases, spectrum detection is not performed. The upper limit frequency of this spectrum is in the 700 to 1200 MHz band, depending on the deterioration and discharge mode. Thus, the frequency spectrum shows different patterns between the non-deteriorating discharge and the deteriorating discharge, so a specific frequency ₀ in the middle of the 300 to 400 MHz band is determined, and the frequency spectrum in a frequency band lower than ₀ is A non-deteriorating discharge is used, and a frequency spectrum extending to a frequency band higher than ₀ can be distinguished as a deteriorating discharge.

As described above, according to the present embodiment, non-degradable discharge and degradable discharge in electrical equipment can be discriminated from each other, so that it is possible to detect insulation deterioration occurring in the constituent insulating material of the electrical equipment, and to reduce the insulation deterioration of the electrical equipment. It can be prevented beforehand.

In this case, the frequency spectrum of the non-deteriorating discharge is stored in the signal storage processing output unit 5 in advance, and if a spectrum having a frequency band higher than the upper limit frequency of this frequency spectrum is detected, the deteriorating discharge, the upper limit The case where a spectrum having a frequency band lower than the frequency is detected may be determined to be non-degradable discharge.

FIG. 2 shows another embodiment of the present invention. In this embodiment, detectors 6 and 7 each having a built-in filter are used instead of the spectrum analyzer shown in FIG. In this case, the same operation and effect as in the above case can be obtained.

That detector 6, _0-0 passes through the band, and an electric circuit having a built-in low-pass filter to block the band of ₀ or more. Detector 7, prevents the _{0-0 band, 0}
It is composed of an electric circuit having a built-in high-pass filter capable of passing the above band. In the signal processing output unit 8, the detection unit 6,
In the case where no signal is detected in 7, it is determined that the signal is normal, the detection unit 6 determines that the signal is detected, and in the case where the signal is not detected in the detection unit 7, it is determined that the discharge is non-degradable. In the case of signal detection, it is determined that the signal is degradable discharge. In the case of signal detection, both detectors 6 and 7 are determined to be degradable discharge. Signals indicating normal, non-degradable discharge, and degradable discharge are output signals. Is output.

In this _case, passing through the ₀ or more frequency bands, _0-0
By providing a detector (not shown) configured to block a band at the output side of the antenna and providing a signal processing device configured to determine that a degradable discharge has occurred when a signal is detected, The number of circuit configurations can be reduced as compared with the case of this embodiment.

FIG. 3 shows still another embodiment of the present invention.
The present embodiment relates to the arrangement of antennas. In an electric device in which the internal space of the housing 1 is divided by partitions 1A, 1B, 1C, and 1D, and electric device components are stored in each of the divided sections. Is an antenna inside each compartment
2A, 2B, 2C and 2D were arranged respectively. In this manner, the abnormal insulation portion can be located for each partition space.

FIG. 4 shows still another embodiment of the present invention.
The difference between the present embodiment and FIG. 1 is that the antennas 2, 2E
That is, the use of the two units removes external interference radio noise. That is, as shown in FIG. 5, the antennas 2 and 2E are disposed inside and outside the housing 1, respectively. The antenna 2 disposed inside detects the electromagnetic wave generated inside the housing and the antenna 2 disposed outside. 2E detects electromagnetic waves that fly outside the housing. Since the housing 1 is made of iron, aluminum, or another conductive metal, the electromagnetic waves transmitted through the housing 1 can be greatly attenuated.
Therefore, the electromagnetic waves generated inside the housing are strong inside the housing,
Weak outside. On the other hand, the electromagnetic waves that fly outside the housing are strong outside the housing and weak inside. Antennas 2 and 2E
FIG. 6 shows an example of measurement of the frequency spectrum detected by the method shown in FIG. FIG. 3A shows the frequency spectrum v _A detected by the antenna 2, and FIG.
Is detected frequency spectrum v _B is indicated by 2E. These frequency spectrum v _A, if v _B is v _A -v _B> 0 considers housing internally generated electromagnetic wave, v _A case of -v _B <0 to the voltage-detection is regarded as the housing outside of the external electromagnetic waves By performing the appropriate signal processing, a frequency spectrum from which the external electromagnetic noise has been removed as shown in FIG. The signal storage processing output unit 10 shown in FIG.
Stores the frequency spectra v _A and v _B and performs the above-described processing of v _A −v _B to eliminate the influence of external electromagnetic noise. As described above, according to the present embodiment, it is possible to eliminate erroneous determination due to the influence of an external electromagnetic wave. In FIG. 4, 3E denotes an amplifier, and 9 denotes a channel switch.

FIG. 7 shows still another embodiment of the present invention.
This embodiment is different from FIG. 1 in that antennas 2F, 2G, 2H, and 2I are arranged inside housings 1E, 1F, 1G, and 1H of a plurality of electric devices, respectively, and each output is set to one unit. Insulation deterioration detector 11
Is to input. By doing so, the insulation deterioration detection of a plurality of electric devices can be performed by one insulation deterioration detector 11.

FIG. 8 shows still another embodiment of the present invention.
This embodiment is different from FIG. 2 in that an output signal from an insulation deterioration detector 11 is transmitted by a transmitter 12 and a transmission (transmission) antenna.
13, and the radiated electromagnetic waves are received by the receiving antenna 14 and the receiver 15 arranged at remote positions. By doing so, the signal cable can be eliminated.

FIG. 9 shows still another embodiment of the present invention.
In the present embodiment, the detector 6 that passes a frequency band of ₀ or less is used.
And a pulse frequency meter 16 and a pulse counter 17 are arranged on the output side of the detection unit 7 that passes the frequency band of ₀ or more. Pulse frequency meter 16 is a counter indicating the number of pulses generated per unit time, the output value n _A represents the frequency per unit time and deterioration discharge a no deterioration discharge. When n _A exceeds a fixed value n ₀ in the signal processing output section 18, a caution signal is output. On the other hand, the output value of the pulse counter 17
N _B is the cumulative number of degradable discharge provides a measure of the deterioration amount in the insulating material. So if the signal processing output unit 18 N _B exceeds a predetermined value N ₀ which suitably determined, so as to output a danger signal. By doing so, the amount of insulation deterioration can be grasped.

FIG. 10 shows still another embodiment of the present invention.
In the present embodiment, the insulation deterioration detector includes the antenna 2, the amplifier 3, the band pass filters 19A, 19B, 19C, 19D, 19E, the peak holders 20A, 20B, 20C, 20D, 20E, the channel switch 21, and the signal storage output device 22. It consisted of. Bandpass filters 19A to 19E
Are 0 to 150 MHz each as a frequency band through which a signal can pass.
z, 150-300MHz, 300-450MHz, 450-600MHz, 600-1200MHz
Filter set to. Peak holder 20A ~ 20E
Is a circuit for holding the peak value of the input signal pulse. The channel switch 21 is a switch circuit for inputting to the signal storage output device 22 by sequentially switching the output values of the peak holders 20A to 20E.

Peak holder 20A input to signal storage output device 22
As for the output values of .about.20E, the peak value is stored for each channel, and the peak value for each channel is output at regular time intervals. By doing so, the change with time of the degradable discharge can be grasped.

In the present embodiment, an example is described in which the band of 0 to 1200 MHz is divided into five, but the present invention is not limited to this.

In this case, a pulse counter may be used instead of the peak holders 20A to 20E. Then, the number of pulses for each frequency section is output with a certain time interval.
By doing so, it is possible to grasp the change over time in the number of occurrences of degradable discharge.

FIG. 11 shows still another embodiment of the present invention.
As shown in the figure, the frequency spectrum measured by the spectrum analyzer 4 is input to the neural network operation device 23. On the other hand, representative examples of the non-degradable frequency spectrum and the degradable frequency spectrum are stored in the data storage device 24 in advance. As a typical example, the spectra of FIGS. 13 and 14 described above may be stored, and a plurality of types of spectra may be stored. In the neural network computing device 23, each time the measurement data of the frequency spectrum is input, a plurality of types of representative frequency spectrums which are input in advance are sequentially called to determine the shape similarity between the measurement data and the stored spectrum data. In the end, the most similar stored spectrum is selected. Each storage spectrum is incremented by one each time it is selected, so that these data are stored in the data storage device 24 and the count is output at regular time intervals. I do. In this way, the non-degradable discharge and the degradable discharge can be discriminated by pattern recognition of the frequency spectrum.

FIG. 12 shows still another embodiment of the present invention.
This embodiment is different from FIG. 1 in that carbon dioxide and ozone gas detectors 25 are arranged, and discharge product gas sampling pipes 26 and 27 are laid at intake and exhaust ports of the housing 1, respectively. . Ozone is generated in non-degradable discharge, and carbon dioxide gas is generated in addition to ozone in degradable discharge. Therefore, when ozone and carbon dioxide gas are both detected and a frequency spectrum having a band component of ₀ or more is detected, the occurrence of deteriorating discharge is determined. This makes it possible to make a highly reliable determination without erroneous determination of the degraded discharge.

In this case, an ozone gas detector may be arranged, and a gas sampling pipe (both not shown) may be laid at the exhaust port of the housing 1. Only when the ozone gas is detected, the non-degradable discharge and the degradable discharge can be determined.
By doing so, the number of components can be reduced compared to the case described above, and a highly reliable determination can be made.

In this case, although not shown in addition to the electromagnetic wave detection,
A gas detector having a built-in metal oxide hot-wire semiconductor element as a discharge generated gas detection sensor may be arranged near the housing exhaust port. Only when gas is detected by this sensor, deteriorating discharge is determined. By doing so, highly reliable determination can be made.

Alternatively, a signal may be detected using a detector that detects a frequency band of 550 to 650 MHz, and if a signal is detected, it may be determined that the discharge is degradable. In this case, the fourteenth
In the frequency spectrum of the degradation of discharge shown in FIG ₀
The signal is detected in the frequency band having the strongest intensity in the above bands. By doing so, it is possible to provide a low-cost insulation deterioration detector with a reduced number of components.

As described above, in each of the embodiments, the detection of the insulation deterioration of the electric equipment has been described. However, not only the electric equipment but also so-called electric equipment such as a cable duct can be applied.

In addition, this embodiment can be similarly applied to an organic insulating material including an inorganic insulating material.

〔The invention's effect〕

As described above, the present invention makes it possible to detect insulation deterioration by distinguishing between non-degradable discharge and degradable discharge and detect insulation deterioration by distinguishing between non-degradable discharge and degradable discharge. This makes it possible to obtain an insulation deterioration detector for an electric device that enables the above.

[Brief description of the drawings]

FIG. 1 to FIG. 4 are explanatory diagrams showing circuit block configurations of different embodiments of an insulation deterioration detector for electric equipment according to the present invention.
FIG. 5 is an explanatory view showing the installation state of the antenna of FIG. 4 in a housing, and FIGS. 6 (a), (b) and (c) show the operation of the embodiment shown in FIGS. 4 and 5. (A) is a frequency spectrum diagram detected by an antenna inside the housing, (b) is a frequency spectrum diagram detected by an antenna outside the housing,
(C) is a frequency spectrum diagram of the difference between the frequency spectra detected in (a) and (b), and FIGS. 7 to 12 are circuit blocks of different embodiments of the insulation deterioration detector of the electric equipment of the present invention. FIG. 13 is a frequency spectrum diagram of one study example of the non-degradable discharge of the present invention, and FIG. 14 is a frequency spectrum diagram of one study example of the degradable discharge of the present invention. 1,1E, 1F, 1G, 1H ... Electrical equipment housing, 2,2A, 2B, 2C, 2D, 2E, 2
F, 2G, 2H, 2I: Antenna for electromagnetic wave detection (electromagnetic wave detector), 3, 3E: Amplifier, 4: Spectrum analyzer,
5 ... signal storage processing output unit, 6 ... detection unit (low range), 7
...... Detection unit (high frequency), 10 ... Signal storage processing output unit, 11 ...
... insulation deterioration detector, 12 ... transmitter, 13 ... transmitting antenna (transmitting antenna), 14 ... receiving antenna, 15 ... receiver, 16 ... pulse frequency meter, 17 ... pulse counter, 23
...... Neural network computing device, 25 ... Carbon dioxide and ozone gas detector.

Claims (8)

(57) [Claims] An insulation deterioration detector for an electric device for detecting insulation deterioration of an electric device, wherein the insulation deterioration detector detects an electromagnetic wave due to a partial discharge of an insulating material used in the electric device. A signal storage processing unit that processes a signal detected by the electromagnetic wave detector to determine an insulation deterioration state, and determines the insulation deterioration state of the signal storage processing unit by performing high-frequency electric discharge by partial discharge of the insulating material. frequency spectrum of the signal, a continuous spectrum from a specific low frequency to the frequency f ₀ in the middle of the 300~400MHz band and the case of the spectral distribution as the signal non-detection in the frequency f ₀ or more frequency bands, insulation deterioration Non-deteriorating discharge without
And if the upper limit frequency of the continuous spectrum is a 700~1200MHz high frequency spectrum distribution from the frequency f _0, insulation deterioration of an electric device, characterized in that the insulation deterioration is so determined as deterioration resistance discharge generated Detector. 2. The apparatus according to claim 1, wherein said electromagnetic wave detector is formed to detect electromagnetic waves of 0 to 1.5 GHz, and said signal storage processing unit obtains a frequency spectrum obtained by detecting a detection signal of said electromagnetic wave detector via a spectrum analyzer. 2. The insulation deterioration detector for an electric device according to claim 1, wherein the detector is configured to determine the insulation deterioration of the electric device. Wherein the electromagnetic wave detector or the signal storage processing unit, and the low frequency detector having a frequency band of 0 to the frequency f _0, and a high-frequency detector with a frequency band of the frequency f ₀ ~1500MHz 2. The insulation deterioration detector for an electric device according to claim 1, further comprising: 4. An electromagnetic wave detector or a signal storage processing unit having a pulse frequency meter indicating the number of pulses generated per unit time at an output side of the low-frequency detection unit, and when the output value exceeds a certain value. It is formed so as to output a caution signal, and has a pulse counter on the output side of the high-frequency detection unit, and outputs a danger signal when the output value exceeds a predetermined value different from the predetermined value. The insulation deterioration detector for electrical equipment according to claim 3, wherein the detector is formed. 5. The electromagnetic wave detector according to claim 1, further comprising an antenna disposed inside and outside of a housing of the electric device, wherein an electromagnetic wave frequency spectrum detected by the antenna disposed inside and the antenna disposed outside. 2. The insulation deterioration detector according to claim 1, wherein the detector is formed to obtain an intensity difference from a detected electromagnetic wave frequency spectrum to remove external electromagnetic noise. 6. An insulation deterioration detector for an electric device for detecting insulation deterioration of an electric device, wherein the insulation deterioration detector detects an electromagnetic wave due to a partial discharge of an insulating material used in the electric device. A signal storage processing unit that processes a signal detected by the electromagnetic wave detector to determine an insulation deterioration state; and a gas detector that detects carbon dioxide and ozone gas inside a housing of the electric device, wherein the signal storage the determination of the insulation degradation state of the processing unit, the frequency spectrum of the high frequency electric signal by the partial discharge of the insulating material, a continuous spectrum from a specific low frequency to the frequency f ₀ in the middle of the 300~400MHz band, and the frequency f _In the case of a spectrum distribution in which a signal is not detected in a frequency band of ₀ or more, a non-deteriorating discharge without insulation deterioration is determined,
And if the upper limit frequency of the continuous spectrum is a 700~1200MHz high frequency spectrum distribution from the frequency f _0, insulation deterioration is determined that the deterioration resistance discharge occurs, and the frequency with the frequency f ₀ or more band components An insulation deterioration detector for electrical equipment, wherein re-confirmation of deteriorating discharge is performed by detecting a spectrum and detecting a gas detector that detects carbon dioxide and ozone gas of the gas detector. 7. An insulation deterioration detector for an electric device for detecting insulation deterioration of an electric device, wherein the insulation deterioration detector includes an electromagnetic wave detector for detecting an electromagnetic wave due to a partial discharge of an insulating material used in the electric device. A signal storage processing unit that processes a signal detected by the electromagnetic wave detector and determines an insulation deterioration state, wherein the signal storage processing unit forms a non-degradable discharge frequency spectrum and tracking without tracking. A representative example of the frequency spectrum of the deteriorating discharge is stored in advance, and the frequency spectrum detected by the electromagnetic wave detector is calculated by the neural network operation device as the closest spectrum among the previously stored frequency spectra. An insulation deterioration detector for electrical equipment, characterized in that it determines whether the discharge is non-deteriorating discharge or deteriorating discharge. 8. The electric power according to claim 7, wherein a representative example of the frequency spectrum of the deteriorating discharge forming the tracking is a frequency spectrum when carbonized black tracking occurs on the surface of the insulating material. Equipment insulation deterioration detector.