JP2010230497A - Insulation deterioration diagnostic device of high voltage power receiving facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulation deterioration diagnostic device of a high voltage power receiving facility for accurately diagnosing the initial state of a partial discharge associated with insulation deterioration in a high voltage power receiving facility. <P>SOLUTION: A high frequency current detector 36 detects a high frequency current flowing in a sheath earth wire of the lead-in cable of the high voltage power receiving facility, an amplifier 37 amplifies the signal detected by the high frequency current detector 36, a detector circuit 38 rectifies and detects an envelope curve signal of the detected signal of the high frequency current flowing in the sheath earth wire, which is amplified by the amplifier 37, and a signal separation circuit 39 separates an output signal of the detector circuit into signals of predetermined 2 band frequencies, Further, a gate circuit 43 obtains a logical product of the separated signals of 2 band frequencies, a determination circuit 44 determines an occurrence of the partial discharge in the high voltage power receiving facility based on the output signal of the gate circuit 43, and when the determination circuit 44 determines that the partial discharge occurs in the high voltage power receiving facility, an alarm is output to an alarm output circuit 45. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an insulation deterioration diagnosis device for a high-voltage power receiving facility that detects partial discharge in the high-voltage power receiving facility and diagnoses the insulation deterioration of the high-voltage power receiving facility.

  It is known that a high-voltage power receiving facility of a power transmission / reception power facility causes deterioration of insulation due to aging of an insulator or dust containing moisture, and partial discharge as a precursor of a serious dielectric breakdown. This partial discharge generates a high-frequency current change and an audible or ultrasonic sound wave. A part of the high-frequency current change is emitted as a current in the electric circuit, and a part is emitted as a radio wave.

  Degradation of insulators used in high-voltage power receiving equipment begins with glow discharge, goes through the initial stage of partial discharge, progresses to the middle stage, and later stage, and eventually shifts from spark discharge to a bridge, and further deterioration progresses. It is known to lead to dielectric breakdown.

By capturing this high-frequency current change, audible and ultrasonic sound waves, and when they exceed a certain level, the partial discharge is detected in the initial state, and an alarm is output to indicate that a partial discharge has occurred. Measures are taken before the power receiving equipment reaches a serious accident.
By installing high-frequency CT at both ends of the lead-in cable of the high-voltage power receiving equipment, the branch of the high-voltage bus or before and after the high-voltage equipment, and detecting the decay direction of the peak value of the discharge signal with a measuring instrument, Identification or discrimination from external noise, and it is possible to identify deterioration of electrical equipment without causing the customer to lose power (for example, see Patent Document 1).

JP-A-11-352177

  However, although the thing of patent document 1 can identify the deterioration apparatus in a high voltage | pressure power receiving installation, or discriminate | determine from external noise, it is difficult to detect a partial discharge in an initial state. In order to detect partial discharges in the initial state and take appropriate measures before dielectric breakdown, it is necessary to increase the detection sensitivity of high-frequency currents and sound waves generated by partial discharges. It also detects high frequency noise, radio wave noise such as radio, and surrounding sound wave noise, and there is a disadvantage that partial discharge cannot be accurately detected.

  An object of the present invention is to provide an insulation deterioration diagnosis device for a high-voltage power receiving facility that can accurately diagnose an initial state of partial discharge accompanying insulation deterioration in the high-voltage power receiving facility.

  The insulation deterioration diagnosis device for a high-voltage power receiving facility according to the first aspect of the invention is a high-frequency current detected by a high-frequency current detector that detects a high-frequency current flowing through a sheath ground wire of a lead-in cable of the high-voltage power receiving facility. An amplifier for amplifying the detection signal, a detection circuit for rectifying and detecting an envelope signal of the detection signal of the high-frequency current flowing through the sheath ground wire amplified by the amplifier, and an output signal of the detection circuit 2 A signal separation circuit that separates signals in one band, a gate circuit that takes a logical product of the signals in the two bands separated by the signal separation circuit, and a part in the high-voltage power receiving facility based on an output signal of the gate circuit A determination circuit for determining the occurrence of discharge, and an alarm output circuit for outputting an alarm when the determination circuit determines that a partial discharge has occurred in the high-voltage power receiving facility. And wherein the door.

  An insulation deterioration diagnosis apparatus for a high-voltage power receiving facility according to the invention of claim 2 is the invention of claim 1, wherein one of the two predetermined bands of the signal separation circuit is 175 Hz to 275 Hz, and the other The frequency band is 2 kHz to 3.5 kHz.

  An insulation deterioration diagnosis apparatus for a high-voltage power receiving facility according to a third aspect of the invention is an amplifier that detects a sound wave superimposed on an electric wire in the high-voltage power receiving facility with a sound wave detector and amplifies the detection signal of the sound wave detected by the sound wave detector A detection circuit for rectifying and detecting an envelope signal of a detection signal of a sound wave superimposed on the electric wire amplified by the amplifier, and a signal separation circuit for separating the output signal of the detection circuit into signals in two predetermined bands A gate circuit that takes a logical product of signals of two bands separated by the signal separation circuit, a determination circuit that determines the occurrence of partial discharge in the high-voltage power receiving facility based on the output signal of the gate circuit, An alarm output circuit is provided that outputs an alarm when the determination circuit determines that a partial discharge has occurred in the high-voltage power receiving facility.

  According to a fourth aspect of the present invention, there is provided an insulation deterioration diagnosis device for a high-voltage power receiving facility according to the third aspect of the invention, wherein one of the two predetermined bands of the signal separation circuit is 120 Hz to 175 Hz, and the other The frequency band is 3 kHz to 5 kHz.

  According to a fifth aspect of the invention, there is provided an insulation deterioration diagnosis apparatus for a high-voltage power receiving facility according to any one of the first to fourth aspects, wherein the determination circuit has a predetermined number of pulses as an output signal of the gate circuit. It is characterized in that it is determined that partial discharge has occurred in the high-voltage power receiving equipment when the state of a predetermined number or more continues for a certain period of time within a period.

  According to a sixth aspect of the present invention, there is provided an insulation deterioration diagnosis device for a high-voltage power receiving facility, wherein a high-frequency current flowing through a sheath ground wire of a lead-in cable of the high-voltage power receiving facility is detected by a high-frequency current detector. A first amplifier for amplifying the detection signal, a first detection circuit for rectifying and detecting an envelope signal of the detection signal of the high-frequency current flowing through the sheath ground wire amplified by the first amplifier, A first signal separation circuit that separates an output signal of one detection circuit into signals of two predetermined bands and a logical product of the signals of the two bands separated by the first signal separation circuit. A first determination circuit for determining the occurrence of partial discharge in the high-voltage power receiving facility based on an output signal of the first gate circuit, and a sound wave that is superimposed on the electric wire in the high-voltage power receiving facility In a vessel A second amplifier for amplifying a detection signal of the sound wave detected by the sound wave detector and a second detection circuit for rectifying and detecting an envelope signal of the detection signal of the sound wave superimposed on the electric wire amplified by the amplifier AND of a second signal separation circuit for separating the output signal of the second detection circuit into two predetermined band signals, and the two band signals separated by the second signal separation circuit A second determination circuit that determines the occurrence of partial discharge in the high-voltage power receiving facility based on an output signal of the second gate circuit, and the first determination circuit or the second determination circuit The determination circuit includes an alarm output circuit for outputting an alarm when it is determined that any of the partial discharges in the high-voltage power receiving facility is generated.

  According to the present invention, for a high-frequency current or sound wave generated by partial discharge, an envelope signal of a high-frequency current or sound wave waveform is extracted by a detection circuit and separated into two predetermined band signals to reduce the influence of noise. In addition, since an alarm is generated when both of the two signals reach a certain level, it is possible to accurately detect the weak partial discharge accompanying the initial stage of the insulation abnormality.

  As a result, by detecting the cause of electrical accidents due to insulation abnormalities in the initial state, it contributes to the prevention of power transmission accidents by spreading to other distribution lines and preventing damage to transmission / distribution distribution line facilities including high-voltage power distribution facilities. can do.

The block diagram of the insulation degradation diagnostic apparatus concerning the 1st Embodiment of this invention. 1 is a configuration diagram of a high-voltage power receiving facility to which an insulation deterioration diagnosis device according to a first embodiment of the present invention is applied. The waveform figure of the high frequency current which actually caused the pseudo partial discharge equivalent to 1000 picocoulombs in the high voltage power receiving equipment and observed it. The block diagram of the insulation degradation diagnostic apparatus concerning the 2nd Embodiment of this invention. The block diagram of the high voltage | pressure power receiving equipment with which the insulation degradation diagnostic apparatus concerning the 2nd Embodiment of this invention was applied. The block diagram of the insulation degradation diagnostic apparatus concerning the 3rd Embodiment of this invention. The block diagram of the high voltage | pressure power receiving equipment with which the insulation degradation diagnostic apparatus concerning the 3rd Embodiment of this invention was applied.

  Embodiments of the present invention will be described below. FIG. 1 is a block diagram of an insulation deterioration diagnosis apparatus according to the first embodiment of the present invention, and FIG. 2 is a block diagram of a high-voltage power receiving facility to which the insulation deterioration diagnosis apparatus according to the first embodiment of the present invention is applied. It is.

  In FIG. 2, electric power is supplied into the high-voltage power receiving facility 14 by a lead-in cable 13 from a distribution line 12 of the power transmission / distribution facility via a column switch 11. In the high-voltage power receiving facility 14, power is supplied to the power receiving bus 18 through the power receiving instrument transformer 15, the disconnector 16, and the circuit breaker 17 connected to the lead-in cable 13.

  A voltmeter 23 that measures the voltage of each phase of the three phases with a voltmeter changeover switch 22 from between the disconnector 16 and the circuit breaker 17 via a high-voltage current limiting fuse 19, an instrument transformer 20, and a fuse 21. Is connected. An instrument current transformer 24 is provided between the circuit breaker 17 and the power receiving bus 18. When the current detected by the instrument current transformer 24 is an overcurrent, an overcurrent that opens the circuit breaker 17 is provided. A relay 25 is provided. Furthermore, an ammeter 27 is connected to measure the current detected by the current transformer 24 by switching the current of each of the three phases by the ammeter changeover switch 26.

  A power receiving transformer 29 is connected to the power receiving bus 18 via a high voltage AC load switch 28 with a current limiting fuse, and power is supplied to a load 31 via a distribution circuit breaker 30 on the secondary side of the power receiving transformer 29. Is supplied. In addition, a series reactor 32 and a phase advance capacitor 33 are connected to the power receiving bus 18 via a high voltage AC load switch 28 with a current limiting fuse.

  In addition, the insulation deterioration diagnosis device 34 receives a high-frequency current from a high-frequency current detector 36 that detects a high-frequency current flowing through the sheath ground wire 35 of the lead-in cable 13 of the high-voltage power receiving facility 14, and the partial discharge in the high-voltage power receiving facility 14 The diagnosis of the occurrence of As shown in FIG. 1, the high-frequency current detected by the high-frequency current detector 36 is input to the amplifier 37 of the insulation deterioration diagnosis device 34. The amplifier 37 amplifies the detection signal of the high frequency current detected by the high frequency current detector 36.

  Here, the high-frequency current detector 36 detects the high-frequency current flowing through the sheath ground wire 35 of the lead-in cable 13 because the leakage current due to deterioration of the lead-in cable 13 is detected in the sheath ground wire 35 of the lead-in cable 13. In addition, a minute high-frequency current accompanying a partial discharge of a circuit in the high-voltage power receiving facility also flows through the capacitance with the electric wire. That is, when a partial discharge occurs, a weak high-frequency current having a wide band flows through the sheath ground wire 35 of the lead-in cable 13. Therefore, a high-frequency current is captured from the sheath ground wire 35 through the high-frequency current detector 36 and input to the insulation deterioration diagnosis device 34.

  The frequency band of the high-frequency current detected by the high-frequency current detector 36 has a relatively low influence of external radio waves, and uses a frequency of 10 MHz to 30 MHz emitted by partial discharge. FIG. 3 is a waveform diagram of a high-frequency current in which a pseudo partial discharge corresponding to 1000 picocoulombs was actually generated and observed. As can be seen from FIG. 3, a high-frequency current of 10 kHz to 30 MHz was observed, and a frequency having a large value among these frequencies is used. For example, a frequency of 22 MHz or 30 MHz is used. As a result, the occurrence of partial discharge can be diagnosed with a high-frequency current that is not affected by external noise. Although not shown, the amplifier 37 adopts a superheterodyne method, converts it to an intermediate frequency (for example, 445 kHz) that is easy to amplify, and performs high-sensitivity amplification.

  The amplitude of the high-frequency current due to the partial discharge is modulated by a complex signal, and the high-frequency current behaves irregularly including a wide-band frequency component such as noise at first glance. The occurrence of partial discharge is detected by analyzing the movement of the envelope focusing on the envelope of the waveform. The detection circuit 38 rectifies and detects the envelope signal of the detection signal of the high-frequency current flowing through the sheath ground wire 35 amplified by the amplifier 37. A change in the amplitude is extracted by rectifying the waveform of the detection signal of the high-frequency current.

  The output signal of the detection circuit 38 is input to the signal separation circuit 39 and separated into signals of two predetermined bands. That is, the signal separation circuit 39 has two bandpass filters 40a and 40b, and the output signals of the two bandpass filters 40a and 40b are amplified by the amplifiers 41a and 41b, respectively, and are respectively detected by the level determination circuits 42a and 42b. A signal equal to or greater than a predetermined value is output to the gate circuit 43.

  For example, the bandpass filter 40a is a bandpass filter that passes 175 Hz to 275 Hz, and the bandpass filter 40b is a bandpass filter that passes 3 kHz to 5 kHz. As described above, the envelope signal of the high-frequency current due to the partial discharge is extracted by dividing the two signals and amplified in a narrow band (175 Hz to 275 Hz, 3 kHz to 5 kHz), thereby amplifying the signal with less influence of noise. . Then, of the signals amplified by the amplifiers 41a and 41b, signals having a predetermined value or more are taken out by the level determination circuits 42a and 42b and output to the gate circuit 43. As a result, a signal in which both of the two signals are at a certain level or higher is logically ANDed by the gate circuit 43 and output to the determination circuit 44 as a pulse signal.

  Here, the movement of the envelope signal of the high-frequency current due to the partial discharge is decomposed into two frequencies (175 Hz to 275 Hz, 3 kHz to 5 kHz), and the relation between the partial discharge and the partial discharge is well understood by taking the logical product of signals over a predetermined value. It was confirmed experimentally that it was possible.

  Since the output signal of the gate circuit 43 is an on / off pulse signal, the determination circuit 44 counts the number of pulses within a predetermined period, and the state where the number of pulses is equal to or larger than the predetermined number within the predetermined period is longer than a certain time. If it continues, it is determined that partial discharge has occurred in the high-voltage power receiving facility, and an alarm signal is output to the alarm output circuit 45.

  When the alarm output circuit 45 has an alarm self-holding circuit, once the alarm is output, the alarm is continuously output. In this case, the alarm output may be restored when the original state is restored. For example, when the number of pulses falls below a predetermined number within a predetermined period and the state continues for a certain time or longer, the alarm output is returned. In this case, the number of pulses and the predetermined time may be set to the same value as the determination value at the time of alarm occurrence, or may be a value that allows for safety.

  Thus, since the determination circuit 44 handles a pulse signal, the determination circuit 44 is configured by a microcomputer, for example. By using a microcomputer, a complicated signal generation situation can be calculated and recorded, and comparison with past data can be easily performed. Therefore, an accurate alarm can be issued while comparing with past data. For example, it is easy to correct a pulse generation pattern for issuing an alarm to an optimum one by accumulating measured data.

  According to the first embodiment, an envelope is obtained by detecting and amplifying a high-frequency current in a band that is less affected by noise, focusing on a change in amplitude of the detection signal that changes with time, and rectifying and detecting the detection signal. The signal of the line is taken out, the rectified and detected signal is divided into two band signals by the signal separation circuit 39 and amplified, the influence of noise is reduced and amplified, and the two divided signals reach a certain level at the same time Since an alarm signal is issued when the operation is started, the initial state of partial discharge can be detected with high accuracy.

  Next, a second embodiment of the present invention will be described. FIG. 4 is a block diagram of an insulation deterioration diagnosis apparatus according to the second embodiment of the present invention, and FIG. 5 is a block diagram of a high-voltage power receiving facility to which the insulation deterioration diagnosis apparatus according to the second embodiment of the present invention is applied. It is. In contrast to the first embodiment, the second embodiment replaces the high-frequency current detector 36 that detects the high-frequency current flowing in the sheath ground wire 35 of the lead-in cable 13 of the high-voltage power receiving facility 14 with the high-voltage power receiving facility. 14 is provided. A sound wave detector 46 for detecting a sound wave superimposed on the electric wire in 14 is provided, an amplifier 37 amplifies the detection signal of the sound wave detected by the sound wave detector 46, and a detection circuit 38 is superimposed on the electric wire amplified by the amplifier 37. An envelope signal of a sound wave detection signal is rectified and detected.

  5, in place of the high-frequency current detector 36, a plurality of sound wave detectors 46 for detecting sound waves superimposed on the electric wires in the high-voltage power receiving facility 14 are provided in the first embodiment shown in FIG. ing. FIG. 5 shows a case where three sound wave detectors 46 are provided in the high-voltage power receiving facility 14. Sound waves superimposed on the electric wires in the high-voltage power receiving equipment 14 detected by the respective sound wave detectors 46 are input to the insulation deterioration diagnosis device 34.

As shown in FIG. 4, the sound wave detected by each sound wave detector 46 is input to the amplifier 37 of the insulation deterioration diagnosis device 34. The amplifier 37 amplifies the sound wave detection signal detected by each sound wave detector 46. The sound wave detected by each sound wave detector 46 is a sound wave in the ultrasonic range. This is because the sound wave is generated by air vibration in the audible range and the ultrasonic range, but the ultrasonic wave is detected from the ease of detection and amplification and the ease of removing the peripheral noise.
Since the amplitude of the ultrasonic wave is modulated by a complex signal, and the ultrasonic wave moves irregularly including a wideband frequency component such as noise at first glance, as in the first embodiment, Focusing on the envelope of this ultrasonic waveform, the generation of partial discharge is detected by analyzing the movement of the envelope. The detection circuit 38 rectifies and detects the envelope signal of the ultrasonic detection signal amplified by the amplifier 37. A change in the amplitude is extracted by rectifying the waveform of the ultrasonic detection signal.

  The ultrasonic signal is also separated into two signals by the signal separation circuit 39. When the levels of the two signals reach a certain value, a pulse signal is output from the gate circuit 43 and sent to the determination circuit 44. As in the first embodiment, the determination circuit 44 is configured by a microcomputer, calculates a pulse signal, and outputs an alarm. In this case, the bandpass filter 40a has a bandwidth of 120 Hz to 175 Hz, and the bandpass filter 40b has a bandwidth of 3 kHz to 5 kHz. As a result, it was experimentally confirmed that the relationship with the partial discharge can be well understood. In the second embodiment, the same effect as in the first embodiment can be obtained.

  Next, a third embodiment of the present invention will be described. FIG. 6 is a block diagram of an insulation deterioration diagnosis apparatus according to the third embodiment of the present invention. FIG. 7 is a block diagram of a high-voltage power receiving facility to which the insulation deterioration diagnosis apparatus according to the third embodiment of the present invention is applied. It is. In the third embodiment, the sound wave detector 46 of the second embodiment is provided with respect to the first embodiment.

  7, in addition to the high-frequency current detector 36, a plurality of sound wave detectors 46 for detecting sound waves superimposed on the electric wires in the high-voltage power receiving equipment 14 are added to the first embodiment shown in FIG. Is provided. FIG. 6 shows a case where three sound wave detectors 46 are additionally provided in the high-voltage power receiving facility 14. Sound waves superimposed on the electric wires in the high-voltage power receiving equipment 14 detected by the respective sound wave detectors 46 are input to the insulation deterioration diagnosis device 34.

  As shown in FIG. 6, the high frequency current detected by the high frequency current detector 36 is input to the amplifier 37 of the insulation deterioration diagnosis device 34. The amplifier 37 amplifies the detection signal of the high frequency current detected by the high frequency current detector 36. The amplifier 37 amplifies the detection signal of the high frequency current detected by the high frequency current detector 36.

  The frequency band of the high-frequency current detected by the high-frequency current detector 36 has a relatively low influence of external radio waves, and uses a frequency of 10 MHz to 30 MHz emitted by partial discharge. The amplitude of the high-frequency current is modulated by a complex signal, and the high-frequency current behaves irregularly including a wide-band frequency component such as noise, so pay attention to the waveform envelope of this high-frequency current. Then, the occurrence of partial discharge is detected by analyzing the movement of the envelope. The detection circuit 38 rectifies and detects the envelope signal of the detection signal of the high-frequency current flowing through the sheath ground wire 35 amplified by the amplifier 37. A change in the amplitude is extracted by rectifying the waveform of the detection signal of the high-frequency current.

  Then, the signal is separated into two signals by the signal separation circuit 39, and when the levels of the two signals reach a certain value, a pulse signal is output from the gate circuit 43 and sent to the determination circuit 44. As in the first embodiment, the determination circuit 44 is configured by a microcomputer, calculates a pulse signal, and outputs an alarm via the OR circuit 47. In this case, the bandwidth of the bandpass filter 40a is 175 Hz to 275 Hz, and the bandwidth of the bandpass filter 40b is 3 kHz to 5 kHz. This is based on the result of experimental confirmation that the relationship with the partial discharge can be well understood.

Similarly, the sound wave detected by each sound wave detector 46 is input to the amplifier 37 of the insulation deterioration diagnosis device 34. The amplifier 37 amplifies the sound wave detection signal detected by each sound wave detector 46. The sound wave detected by each sound wave detector 46 is a sound wave in the ultrasonic range. This is because the sound wave is generated by air vibration in the audible range and the ultrasonic range, but the ultrasonic wave is detected from the ease of detection and amplification and the ease of removing the peripheral noise.
Since the amplitude of the ultrasonic wave is modulated by a complex signal, and the ultrasonic wave moves irregularly including a wideband frequency component such as noise at first glance, as in the first embodiment, Focusing on the envelope of this ultrasonic waveform, the generation of partial discharge is detected by analyzing the movement of the envelope. The detection circuit 38 rectifies and detects the envelope signal of the ultrasonic detection signal amplified by the amplifier 37. A change in the amplitude is extracted by rectifying the waveform of the ultrasonic detection signal.

  The ultrasonic signal is also separated into two signals by the signal separation circuit 39. When the levels of the two signals reach a certain value, a pulse signal is output from the gate circuit 43 and sent to the determination circuit 44. As in the second embodiment, the determination circuit 44 is configured by a microcomputer, calculates a pulse signal, and outputs an alarm via the OR circuit 47. In this case, the band pass filter 40a has a bandwidth of 120 Hz to 175 Hz, and the band pass filter 40b has a bandwidth of 3 kHz to 5 kHz. This is based on the result of experimental confirmation that the relationship with the partial discharge can be well understood.

  According to the third embodiment, since the partial discharge can be detected by either the high frequency current detected by the high frequency current detector 36 or the sound wave detected by the sound wave detector 46, the partial discharge can be detected more accurately. Will improve.

DESCRIPTION OF SYMBOLS 11 ... Column-shaped switch, 12 ... Distribution line, 13 ... Lead-in cable, 14 ... High voltage power receiving equipment, 15 ... Electric power receiving instrument transformer, 16 ... Disconnector, 17 ... Circuit breaker, 18 ... Power receiving bus, 19 ... High voltage Current limiting fuse, 20 ... instrument transformer, 21 ... fuse, 22 ... voltmeter changeover switch, 23 ... voltmeter, 24 ... instrument current transformer, 25 ... overcurrent relay, 26 ... ammeter changeover switch, 27 ... Ammeter, 28 ... High-voltage AC load switch with current-limiting fuse, 29 ... Power receiving transformer, 30 ... Power distribution breaker, 31 ... Load, 32 ... Series reactor, 33 ... Phase advance capacitor, 34 ... Insulation degradation diagnostic device 35 ... sheathed ground wire, 36 ... high frequency current detector, 37 ... amplifier, 38 ... detection circuit, 39 ... signal separation circuit, 40 ... band pass filter, 41 ... amplifier, 42 ... level judgment circuit, 43 ... gate circuit 44 ... judgment circuit, 45 ... alarm output circuit, 46 ... ultrasonic detector, 47 ... OR circuit

Claims (6)

  An amplifier for detecting a high-frequency current flowing through a sheath ground wire of a lead-in cable of a high-voltage power receiving facility by a high-frequency current detector and amplifying a detection signal of the high-frequency current detected by the high-frequency current detector, and the sheath amplified by the amplifier A detection circuit for rectifying and detecting an envelope signal of a detection signal of a high-frequency current flowing in the ground wire, a signal separation circuit for separating an output signal of the detection circuit into signals of two predetermined bands, and the signal separation circuit A gate circuit that obtains a logical product of the separated signals of the two bands; a determination circuit that determines the occurrence of partial discharge in the high-voltage power receiving facility based on an output signal of the gate circuit; and the determination circuit includes the high-voltage power receiving facility An insulation deterioration diagnosis device for high-voltage power receiving equipment, comprising: an alarm output circuit that outputs an alarm when it is determined that partial discharge has occurred.   2. The high-voltage power receiving according to claim 1, wherein one of the two predetermined bands of the signal separation circuit is 175 Hz to 275 Hz, and the other band is 2 kHz to 3.5 kHz. Equipment insulation deterioration diagnosis device.   An acoustic wave detector that detects the sound wave superimposed on the electric wire in the high-voltage power receiving facility and amplifies the sound wave detection signal detected by the sound wave detector, and the sound wave detection signal superimposed on the electric wire amplified by the amplifier A detection circuit that rectifies and detects an envelope signal, a signal separation circuit that separates an output signal of the detection circuit into two predetermined band signals, and a logic of two band signals separated by the signal separation circuit A gate circuit that takes a product, a determination circuit that determines occurrence of partial discharge in the high-voltage power receiving facility based on an output signal of the gate circuit, and the determination circuit determines that partial discharge is generated in the high-voltage power receiving facility An insulation deterioration diagnosis device for high-voltage power receiving equipment, characterized by comprising an alarm output circuit for outputting an alarm.   4. The high-voltage power receiving equipment according to claim 3, wherein one of the two predetermined bands of the signal separation circuit is 120 Hz to 175 Hz, and the other band is 3 kHz to 5 kHz. Insulation deterioration diagnosis device.   The determination circuit determines that a partial discharge has occurred in the high-voltage power receiving facility when the number of pulses, which are output signals of the gate circuit, continues for a predetermined time or more within a predetermined period. The insulation deterioration diagnosis apparatus for high-voltage power receiving equipment according to any one of claims 1 to 4.   A first amplifier for detecting a high-frequency current flowing in a sheath ground wire of a lead-in cable of a high-voltage power receiving facility by a high-frequency current detector and amplifying a detection signal of the high-frequency current detected by the high-frequency current detector; and the first amplifier The first detection circuit for rectifying and detecting the envelope signal of the detection signal of the high-frequency current flowing through the sheath ground wire amplified in step S1 and the output signal of the first detection circuit are signals in two predetermined bands. Based on a first signal separation circuit that separates, a first gate circuit that takes a logical product of signals of the two bands separated by the first signal separation circuit, and an output signal of the first gate circuit A first determination circuit for determining the occurrence of partial discharge in the high-voltage power receiving facility, and a sound wave superimposed on the electric wire in the high-voltage power receiving facility is detected by a sound wave detector, and a sound wave detection signal detected by the sound wave detector is detected. Amplify Two amplifiers, a second detection circuit that rectifies and detects an envelope signal of a detection signal of a sound wave superimposed on the electric wire amplified by the amplifier, and two predetermined output signals of the second detection circuit A second signal separation circuit that separates the signal into a band signal; a second gate circuit that takes a logical product of the signals of the two bands separated by the second signal separation circuit; and an output of the second gate circuit A second determination circuit that determines the occurrence of partial discharge in the high-voltage power receiving facility based on the signal, and one of the first determination circuit and the second determination circuit is the occurrence of partial discharge in the high-voltage power receiving facility. An insulation deterioration diagnosis device for high-voltage power receiving equipment, comprising an alarm output circuit that outputs an alarm when it is determined that

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