JP2018077110A - Switchgear inspection device and system and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine an abnormality of a switchgear even in a state where a drive part of the switchgear is not operating (during normal energization or the like). An oscillator 2 is brought into close contact with a drive unit 3 such as a circuit breaker or a disconnector of a gas insulation device, and a resonance frequency of the drive unit 3 is acquired from a frequency spectrum as a pre-measurement. The oscillator 2 inputs a pulse compression wave having a resonance frequency as a center frequency or a pulse wave as an incident wave to the drive unit 3, and measures a reflected wave from the drive unit 3 by the receiver 4. The waveform data storage unit 5 stores the frequency spectrum of the measurement waveform as measurement data. The correlation evaluation unit 9 and the correlation evaluation unit 11 determine the abnormality from the determination result that evaluates the change in the correlation between the initial data acquired when the frequency spectrum is assembled and the spectrum after the operation time of the apparatus has elapsed. carry out. [Selection] Figure 1

Description

  The present invention relates to a switchgear inspection device, system, and method, and more particularly, for example, a power receiving unit that receives power from a power system by installing driving units such as a circuit breaker and a disconnecting device in a gas insulated sealed container, and a circuit breaker And an inspection device for the switchgear for inspecting a drive unit of the switchgear such as a gas-insulated switchgear having a power supply unit that feeds electric power to the load side through a bus line by installing the disconnector in the gas insulation container, and The present invention relates to a system and method.

In general, in a gas insulated switchgear, main circuit devices such as a power disconnecting switch, a circuit breaker, and a bus disconnecting switch are housed in a sealed container filled with an insulating gas such as SF6. Are connected, and an operation mechanism of the main circuit device is installed on the front surface side of the sealed container, and each device is connected by a main circuit conductor.
In a gas insulated switchgear for power reception, power is drawn from the power system by a power cable, and power is supplied to the bus via the power disconnector-breaker-busbar disconnector.
In the case of a gas insulated switchgear for power supply, power is received from the bus and is supplied to the power cable connected to the load via the busbar disconnector-breaker-feeder disconnector. A gas insulated switchgear constituting one bay having three lines for one line and a gas insulated switchgear constituting one adjacent bay are electrically connected by a bus. In the gas insulated switchgear configured as described above, there is an advantage that the main circuit device and the main circuit conductor can be reduced in size and increased in reliability by being installed in a sealed container filled with an insulating gas. Among these, the circuit breaker, disconnector, and grounding switch have a drive mechanism that operates to open and close the device by a hydraulic spring, a spring, or an electric system.

JP 63-043524 A

  However, in the gas-insulated switchgear as described above, it is assumed that the driving portion of the gear or the link mechanism is deteriorated with the passage of time, and operation troubles such as astringency occur. In a device that constantly rotates, such as a generator or a rotating machine, an operation abnormality can be determined by rotational vibration. On the other hand, the gas-insulated switchgear is a quasi-stationary device that is normally energized and the drive unit is stationary, and the drive unit is operated less frequently. Therefore, in the gas insulated switchgear, there is a problem that it is necessary to determine abnormality of the drive unit in a stationary state.

In view of the above, an object of the present invention is to make it possible to determine an abnormality of a switchgear even when the drive unit of the switchgear is not operating (during normal energization or the like).

According to the first solution of the present invention,
An inspection device for a switchgear,
An oscillator,
A receiver,
A processing unit;
With
The processor is
In an initial state of the switchgear, a first incident signal is input from the oscillator to the drive unit, and a plurality of first resonance frequencies are obtained from frequency components received by the reception unit from the drive unit,
Each second incident signal having each first resonance frequency as a center frequency is incident on the driving unit by the oscillator, and each second reflected signal is received from the frequency component of each second reflected signal received from the driving unit by the receiving unit. Get the resonance frequency,
After the start of operation of the switchgear, each third reflected signal received by the receiving unit from the driving unit after each second incident signal having the second resonance frequency as the center frequency is incident on the driving unit by the oscillator. Obtaining each third resonance frequency from the frequency components of
An abnormality is determined from the correlation between each second resonance frequency and each third resonance frequency.
An inspection device for a switchgear is provided.

According to the second solution of the present invention,
A switchgear inspection system,
The oscillator that is pre-attached or incorporated in the drive unit of the switchgear and receives the first incident signal; and the first reflected signal from the drive unit that is pre-attached or preinstalled in the switcher of the switchgear An opening and closing device comprising:
An inspection device;
With
The inspection device includes:
A first processing function unit that inputs a first incident signal from the oscillator to the driving unit and acquires a plurality of first resonance frequencies from frequency components received by the receiving unit from the driving unit in an initial state of the switchgear When,
Each second incident signal having each first resonance frequency as a center frequency is incident on the driving unit by the oscillator, and each second reflected signal is received from the frequency component of each second reflected signal received from the driving unit by the receiving unit. A second processing function unit for obtaining a resonant frequency;
After the start of operation of the switchgear, each third reflected signal received by the receiving unit from the driving unit after each second incident signal having the second resonance frequency as the center frequency is incident on the driving unit by the oscillator. A third processing function unit for obtaining each third resonance frequency from the frequency components of
A fourth processing function unit for determining abnormality from the correlation between each second resonance frequency and each third resonance frequency;
An inspection system for a switchgear comprising:

According to the third solution of the present invention,
An inspection method for a switchgear,
In an initial state of the switchgear, a first incident signal is input from the oscillator to the drive unit, and a plurality of first resonance frequencies are obtained from frequency components received by the reception unit from the drive unit,
Each second incident signal having each first resonance frequency as a center frequency is incident on the driving unit by the oscillator, and each second reflected signal is received from the frequency component of each second reflected signal received from the driving unit by the receiving unit. Get the resonance frequency,
After the start of operation of the switchgear, each third reflected signal received by the receiving unit from the driving unit after each second incident signal having the second resonance frequency as the center frequency is incident on the driving unit by the oscillator. Obtaining each third resonance frequency from the frequency components of
An abnormality is determined from the correlation between each second resonance frequency and each third resonance frequency.
An inspection method for a switchgear is provided.

  According to the present invention, it is possible to determine whether the switchgear is abnormal even when the drive unit of the switchgear is not operating (during normal energization or the like).

Schematic explanatory drawing which shows the structure of the drive part test | inspection system of a gas insulated switchgear. Explanatory drawing which shows the frequency component data of the received wave of a drive part. Explanatory drawing which shows the correlation of the resonant frequency in an initial frequency characteristic, and the resonant frequency after apparatus operation start. Explanatory drawing which shows the flowchart of an inspection method. Explanatory drawing which shows a pulse compression wave. The block diagram of the drive part test | inspection system for remotely monitoring a gas insulated switchgear. Explanatory drawing which shows an impulse waveform example.

A. Overview

In the inspection apparatus and system and method of the switchgear according to the present embodiment, in particular, the drive part inspection apparatus and system and method of the gas insulated switchgear, and the gas insulated switchgear and drive part inspection apparatus system incorporating the drive inspection apparatus A main circuit device having at least a drive unit such as a disconnect switch, a ground switch, a circuit breaker, and a disconnect switch with a ground switch is accommodated in a gas insulating container filled with an insulating gas. In the present embodiment, for example, the following processing is performed.
First, an oscillator is closely attached to the circuit breaker of the gas insulation device and the drive unit of the disconnector, and the resonance frequency of the drive unit is acquired from the frequency spectrum as a pre-measurement.
Next, a pulse compression wave or a pulse wave having the resonance frequency as the center frequency is input as an incident wave to the drive unit, and a reflected wave from the drive unit is measured by the receiver.
Next, the frequency spectrum of the measurement waveform is stored as measurement data.
Next, the abnormality is determined from the determination result obtained by evaluating the change in the correlation between the initial data acquired when the frequency spectrum is assembled and the spectrum after the operation time of the apparatus has elapsed.

Hereinafter, this embodiment will be described with reference to the drawings.

B. First embodiment

FIG. 1 is a schematic explanatory diagram showing the configuration of a drive unit inspection system for a gas insulated switchgear.
This system includes a gas insulated switchgear 100-1 and an inspection device 200-1. Specifically, the present system includes a signal generator 1 that generates a signal waveform incident on a driving portion, an oscillator 2 that makes vibrations incident on the driving portion 3 in contact with the driving portion 3, and a driving portion 3 of a gas-insulated switchgear. , A receiver 4 that receives a reflected wave from the drive unit 3, a waveform data storage unit 5 that stores a received signal, a Fourier transform unit 6 that derives a frequency component from the waveform data, and frequency component data immediately after the gas insulation switchgear is assembled. The initial frequency characteristic storage unit 7 for recording, the operating frequency characteristic storage unit 8 for recording the operating frequency characteristic of the drive unit 3 when the time has elapsed since the start of operation of the apparatus, and the correlation between the initial frequency characteristic and the frequency characteristic after the start of operation. A correlation calculation unit 9 for calculating, a correlation storage unit 10 for recording a calculation result of the correlation, a correlation evaluation unit 11, and an evaluation result display unit / storage unit 12 are provided. The processing unit 51 includes a Fourier transform unit 6, a correlation calculation unit 9, and a correlation evaluation unit 11, and various processes such as data writing and reading of each storage unit / storage unit, and signal generation Various controls and processes of the device 1, the oscillator 2, the receiver 4, the evaluation result display unit / storage unit 12, and the like are executed.

  For example, the signal generator 1 can generate an incident signal having a waveform such as a pulse compression wave in addition to a sine wave, and the frequency of these waveforms can be arbitrarily set. The oscillator 2 changes the electrical signal from the signal generator 1 to mechanical vibration and enters the drive unit 3. The incident wave to the drive unit 3 reaches the drive unit and / or the gas insulated switchgear and is reflected. The reflected wave is received by the receiver 4 and converted into an electric signal. The electric signal is recorded in the waveform data storage unit 5. At this time, the waveform data is a time domain waveform and is converted into a frequency domain waveform by the Fourier transform unit 6. The initial frequency domain waveform of the reflected wave of the drive unit 3 immediately after the gas-insulated switchgear is assembled is recorded in the initial frequency characteristic storage unit 7, and the reflected wave of the drive unit 3 in a state in which time has elapsed after the gas-insulated switchgear is operated. The frequency domain waveform during operation is recorded in the operation frequency characteristic storage unit 8. The correlation between the initial frequency characteristic and the operating frequency characteristic after the elapsed time is calculated by the correlation calculation unit 9. The correlation around each resonance frequency of the incident wave to the drive unit 3 is recorded in the correlation storage unit 10 of each resonance frequency. The calculation result recorded in the correlation storage unit 10 is determined by the correlation evaluation unit 11, and the determination result is displayed and / or stored in the evaluation result display unit / storage unit 12.

FIG. 4 is an explanatory diagram showing a flowchart of the inspection method.
Details of the determination method will be described below.

(S11; pre-measurement)
First, after the gas insulated switchgear is assembled (initial state), the processing unit 51 inputs an incident signal such as a pulse wave from the oscillator 2 to the driving unit 3. Here, after assembling (initial state), for example, after operating the gas insulated switchgear in a closed state, after a predetermined time immediately after assembly, after becoming stable or steady state, etc. Appropriate timing can be determined as the initial state. For example, in the drive unit 3 of the circuit breaker or disconnector, the oscillator 2 contacts a drive shaft or the like accessible from the outside, and transmits the vibration to the drive unit 3. As the incident waveform, an appropriate one such as an impulse wave or a compressed pulse wave can be used. The processing unit 51 measures the reflected wave (reflected signal) from the driving unit 3 by the sensor of the receiving unit 4 and stores it in the waveform data storage unit 5. Note that time, frequency, waveform information, various identification information, and the like can be included as appropriate when data is recorded in each storage unit / storage unit. The processing unit 51 reads the waveform data from the waveform data storage unit 5 and uses the time domain signal in the reflected signal as frequency component data in the Fourier transform unit 6 to acquire a plurality of predetermined resonance frequencies of the driving unit. The above is the pre-measurement.

FIG. 2 is an explanatory diagram showing frequency component data of the received wave of the drive unit. Here, as the resonance frequencies F ₁ , F ₂ ,..., For example, a predetermined number can be selected from relatively strong frequencies. The low frequency is assumed to contain relatively noise, and the high frequency is assumed to be attenuated and difficult to measure. However, the frequency below and / or above the predetermined frequency should be excluded. May be.

(S12; initial characteristic acquisition)
Further, the processing unit 51 uses the oscillator 2 to drive incident signals such as pulse compression waves having a center frequency at a plurality of resonance frequencies F1, F2,. As described above, finer frequency characteristics are obtained using the receiving unit 4, the waveform data storage unit 5, the Fourier transform unit 6 and the like. The processing unit 51 sets the resonance frequencies f1, f2, f3,... Obtained at this time as initial frequency characteristics and records them in the initial frequency characteristic storage unit 7. Here, the frequencies f1 and f2 are fine resonance frequencies measured by the obtained reflected signals when the frequencies F1 and F2 are incident, respectively.

(S13; after device operation)
After starting the operation of the gas insulated switchgear, the processing unit 51 refers to the initial frequency characteristic storage unit 7 to obtain the resonance frequencies f1, f2, f3,..., And similarly to the above, the resonance frequencies f1, f2, Resonant frequencies f1 ′, f2 ′, f3 ′,... are obtained from reflected waves with respect to the incidence of a pulse compression wave centered on f3,..., and the operating frequency characteristics are recorded in the operating frequency characteristics storage unit 8.

(S14: abnormality determination)
FIG. 3 is an explanatory diagram showing the correlation between the resonance frequency in the initial frequency characteristics and the resonance frequency after the start of operation of the apparatus.
The processing unit 51 determines the correlation between the resonance frequencies f1, f2, f3,... In the initial frequency characteristics and the resonance frequencies f1 ′, f2 ′, f3 ′,. Calculate with For example, the processing unit 51 sets the correlation as the initial characteristic on the horizontal axis and the characteristic after the elapsed time on the vertical axis, sets a correlation threshold, and determines that the correlation is abnormal when the threshold is exceeded. More specifically, a set of corresponding resonance frequencies is set such that f1 ′ for the initial resonance frequency f1 and f2 ′ for f2. When an abnormality such as an astringency occurs in the link of the driving unit 3 or the gear unit, the natural frequency of the driving unit 3 changes, so that the shared frequency is shifted. For example, when this deviation exceeds a threshold, it can be determined that there is an abnormality. The threshold value can be set, for example, based on the deviation of the resonance frequency in a separate element test in a case where the normal resonance frequency is typically set to a firm state. Of these, the shift amount can be calculated by various calculation methods such as a Euclidean distance on the correlation in the corresponding set of resonance frequencies. The processing unit 51 performs the above-described determination for each center frequency, and records the determination result for each center frequency in the correlation storage unit 10 for each resonance frequency. The processing unit 51 determines the number of frequencies determined to be abnormal using the result of each correlation storage unit 10 and the degree of abnormality in the correlation evaluation unit 11 and evaluates the state of abnormality, for example. . Note that the degree of abnormality can be determined by, for example, comparing the amount of deviation with a predetermined threshold. In addition, the evaluation of the abnormal state may be performed by, for example, obtaining an index by adding or integrating the number determined as abnormal, the degree of abnormality with a predetermined weight, and comparing the index with a predetermined threshold value. Can be performed. The processing unit 51 displays and / or stores the above-described evaluation result in the evaluation result display unit / storage unit 12. (FIG. 4) As a display method, for example, the presence / absence of abnormality, time, drive unit identification information, the correlation diagram shown in FIG. 3, and the like can be appropriately displayed.

[Incoming waveform]
In the present system, a pulse wave is input from the oscillator 2 to the drive unit 3 as described above. The oscillator 2 is in contact with a drive shaft accessible from the outside in the drive unit 3 such as a circuit breaker or a disconnector, and transmits vibrations to the drive unit.

FIG. 7 is an explanatory diagram showing an example of an impulse waveform.
In the pre-measurement (S11) shown in FIG. 4, the input waveform can be an impulse waveform as shown in FIG. 7, for example. FIG. 7A shows the time characteristics of signal strength, and FIG. 7B shows the frequency characteristics. Such a waveform includes a wide range of frequency characteristics for obtaining a plurality of resonance frequencies.

FIG. 5 is an explanatory diagram showing a pulse compression wave.
The incident waveform at each resonance frequency can be, for example, a pulse compression wave as shown in FIG. FIG. 5A shows a time characteristic of signal strength, and FIG. 5B shows a frequency characteristic having the center frequency. In this system, at least two types of the center frequency of the compression wave are incident as the resonance frequencies f1, f2, f3,... In the initial state, and the frequency characteristics of each reflected wave are recorded in the operating frequency characteristic storage unit 8. To do. Also in the measurement after the start of operation of the gas insulated switchgear, a pulse compression wave having the same type of center frequency as that described above is incident and the reflection characteristics are measured. As a result, it is possible to acquire the frequency characteristics after the time has elapsed more precisely at a frequency near the resonance frequency.

と記すとき、その平均値ベクトルμ、分散共分散行列Σは以下のように求められる。 [Calculation of correlation]
The initial frequency characteristics f1, f2, f3,... Recorded in the initial frequency characteristic storage unit 7, and the frequency characteristics f1 ′, f2 ′, f3 ′,. As a method for calculating the correlation between the initial frequency characteristic and the frequency characteristic after the elapsed time, for example, the correlation calculation unit 9 can determine the correlation using the Mahalanobis distance. At this time, assuming that the data is an n-dimensional continuous vector, the obtained data string is represented by x ^m = x ₁ , x ₂ , x ₃ ,. . . as x _m, the i-th data,

, The mean value vector μ and the variance-covariance matrix Σ are obtained as follows.

ここで、θを閾値パラメータとして、新しいデータｘに対して、

を満たす場合、ｘは異常値であると判定する。
この他にも、相関を計算する方法として、例えば、母集団相関係数、標本相関係数、ピアソンの積分相関係数等、適宜の方法を用いることができる。

Here, with θ as a threshold parameter, for new data x,

If x satisfies, x is determined to be an abnormal value.
In addition, as a method for calculating the correlation, for example, an appropriate method such as a population correlation coefficient, a sample correlation coefficient, a Pearson integral correlation coefficient, or the like can be used.

C. Second embodiment

FIG. 6 is a configuration diagram of a drive unit inspection system for remotely monitoring the gas insulated switchgear.
This system includes a gas insulated switchgear 100-2 and an inspection device 200-2. In this system, the gas insulated switchgear 100-2 is configured in a state in which the oscillator 2 and the receiver 4 are previously incorporated in the shaft of the drive unit 3 (attached to the surface or the like). The signal generator 1 and the receiver 4 are connected to the data processing unit 13-1. The data processing unit 13-1 has one or more appropriate configurations (waveform data storage unit 5 and the like) in the memory 52 and one or more appropriate configurations (correlation calculation unit 9 and the like) of the processing unit 51, and data The processing unit 13-2 has one or more configurations of the memory 52 and the processing unit 51 other than that. The data processing unit 13-1 is connected to the data processing unit 13-2 of the centralized management room 15 online or offline via an appropriate wired or wireless communication line or network and the communication device 14, and the centralized management room 15 Thus, data can be acquired, displayed and / or stored at any time.

D. Third embodiment (mode measurement)

In the above-described embodiment, two or more oscillators 2 and receivers 4 may be installed. As an example, one oscillator 2 and two receivers 4 are provided, one oscillator 2 is installed on the main shaft of the drive unit 3, one of the receivers 4 is installed on the main shaft, and the other receiver 4 is driven. It can be installed on the countershaft of part 3. The processing unit 51 receives the reflected wave with respect to the signal input from the oscillator 2 by each receiver 4 and acquires the frequency characteristic as described above. A plurality of oscillators 2 may be provided. The processing unit 51 may add the installation location of the oscillator 2 and the receiver 4 and the combination of sensors as parameters. Thereby, the mode measurement of the vibration of the drive unit 3 (for example, the mode by the main shaft, the mode by the sub shaft, etc.) can be performed, and the content of the abnormality of the drive unit 3 can be determined.

E. Effects of the embodiment

According to the present embodiment, even when the drive unit of the gas insulated switchgear is not operating (during normal energization, etc.), it is possible to determine the abnormality of the drive unit. There is no need to disassemble and inspect, and furthermore, the gas insulated switchgear can be inspected without switching or stopping the power system, so the inspection period can be greatly shortened. In addition, since inspection can be performed without stopping the apparatus, inspection data can be acquired at arbitrary time intervals, and time-series data can be acquired, improving the reliability of the apparatus.

F. Appendix

In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.
Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function can be stored in a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.
Further, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

DESCRIPTION OF SYMBOLS 1; Signal generator, 2; Oscillator, 3; Drive part, 4; Receiver, 5; Waveform data storage part, 6: Fourier-transform part, 7: Initial frequency characteristic storage part; Operation frequency characteristic storage part, 9; Correlation calculation unit, 10; correlation storage unit, 11; correlation evaluation unit, 12; evaluation result display unit / storage unit, 13; data processing device, 14; communication device, 15; centralized management room, 16;

Claims (15)

An inspection device for a switchgear,
An oscillator,
A receiver,
A processing unit;
With
The processor is
In an initial state of the switchgear, a first incident signal is input from the oscillator to the drive unit, and a plurality of first resonance frequencies are obtained from frequency components received by the reception unit from the drive unit,
Each second incident signal having each first resonance frequency as a center frequency is incident on the driving unit by the oscillator, and each second reflected signal is received from the frequency component of each second reflected signal received from the driving unit by the receiving unit. Get the resonance frequency,
After the start of operation of the switchgear, each third reflected signal received by the receiving unit from the driving unit after each second incident signal having the second resonance frequency as the center frequency is incident on the driving unit by the oscillator. Obtaining each third resonance frequency from the frequency components of
An abnormality is determined from the correlation between each second resonance frequency and each third resonance frequency.
Inspection device for switchgear.
The inspection apparatus for a switchgear according to claim 1,
The processor is
A Fourier transform unit;
A correlation calculation unit;
An initial frequency characteristic storage, an operating frequency characteristic storage,
A correlation store;
With
The Fourier transform unit obtains a plurality of first resonance frequencies from the frequency components of the first reflected signal in an initial state of the switchgear, and calculates each second resonance frequency from the frequency components of the second reflected signals. And store it in the initial frequency characteristic storage unit,
The Fourier transform unit obtains each third resonance frequency from the frequency component of each third reflected signal after starting the operation of the switchgear, and stores the third resonance frequency in the operation frequency characteristic storage unit,
The correlation calculation unit refers to the initial frequency characteristic storage unit and the operating frequency characteristic storage unit, and determines a second abnormality from a deviation in correlation between each second resonance frequency and each third resonance frequency. Execute for each resonance frequency, and store the determination result in the correlation storage unit,
An inspection device for a switchgear characterized by the above.
The inspection apparatus for a switchgear according to claim 2,
The processing unit further includes a correlation evaluation unit that refers to the correlation storage unit and evaluates an abnormal state from the number and / or degree of abnormality of the second and third resonance frequencies determined to be abnormal. An inspection device for a switchgear characterized by the above.
In the inspection apparatus of the switchgear according to claim 3,
The correlation evaluation unit displays the evaluation result on the evaluation result display unit and / or stores it in the evaluation result storage unit and / or outputs it to another device.
The inspection apparatus for a switchgear according to claim 1,
The oscillator is attached so as to contact an externally accessible drive shaft and transmit vibration to the drive unit in another circuit breaker and / or disconnector and / or other drive unit of the switchgear. Inspection device for opening and closing device.
The inspection apparatus for a switchgear according to claim 1,
An inspection device for a switchgear, wherein the oscillator uses an impulse wave as an incident signal in an initial state and a pulse compression wave after the start of operation.
The inspection apparatus for a switchgear according to claim 1,
The processing unit calculates a deviation amount between the second resonance frequency and the third resonance frequency by using a Euclidean distance, a Mahalanobis distance, a Pearson integral correlation coefficient, or another correlation coefficient in a corresponding resonance frequency set. An inspection device for a switchgear, characterized in that determination is made using either one.
The inspection apparatus for a switchgear according to claim 1,
An inspection apparatus for a switchgear, wherein the oscillator and the receiver are attached in advance or incorporated in a drive unit of the switchgear.
The inspection apparatus for a switchgear according to claim 1,
A plurality of the oscillator and / or the receiver are provided,
An inspection apparatus for a switchgear, wherein the processing unit acquires first to third reflected signals in a plurality of vibration modes of a driving unit by a combination of the oscillator and the receiver, and performs abnormality determination.
The inspection apparatus for a switchgear according to claim 9,
One oscillator is installed on the main axis or the first axis of the drive unit, one of the receivers is installed on the main axis or the first axis, and the other receiver is installed on the auxiliary axis or the second axis of the drive unit. Installed in
The first to third reflected signals with respect to the signal input from the oscillator are received by the receivers, and first to third resonance frequencies are obtained.
An inspection device for a switchgear characterized by the above.
The inspection apparatus for a switchgear according to claim 1,
An inspection apparatus for a switchgear, wherein the processing unit writes one or more of the first to third resonance frequencies and correlations to and from the storage unit.
The inspection apparatus for a switchgear according to claim 1,
The switchgear inspection device, wherein the switchgear is a gas insulated switchgear.
A switchgear inspection system,
The oscillator that is pre-attached or incorporated in the drive unit of the switchgear and receives the first incident signal; and the first reflected signal from the drive unit that is pre-attached or preinstalled in the switcher of the switchgear An opening and closing device comprising:
An inspection device;
With
The inspection device includes:
A first processing function unit that inputs a first incident signal from the oscillator to the driving unit and acquires a plurality of first resonance frequencies from frequency components received by the receiving unit from the driving unit in an initial state of the switchgear When,
Each second incident signal having each first resonance frequency as a center frequency is incident on the driving unit by the oscillator, and each second reflected signal is received from the frequency component of each second reflected signal received from the driving unit by the receiving unit. A second processing function unit for obtaining a resonant frequency;
After the start of operation of the switchgear, each third reflected signal received by the receiving unit from the driving unit after each second incident signal having the second resonance frequency as the center frequency is incident on the driving unit by the oscillator. A third processing function unit for obtaining each third resonance frequency from the frequency components of
A fourth processing function unit for determining abnormality from the correlation between each second resonance frequency and each third resonance frequency;
Inspection system for switchgear equipped with
The inspection system for a switchgear according to claim 13,
A first data processing unit having first to nth (n is an integer of 2 to 4) processing function units of the receiver or the inspection device;
The second data processing unit is connected to the first data processing unit via a network or a line and includes the nth to fourth processing function units of the inspection apparatus. A centralized management room for acquiring any one or a plurality of output data of the first to n-th processing function units from the data processing unit;
An inspection system for a switchgear characterized by further comprising:
An inspection method for a switchgear,
In an initial state of the switchgear, a first incident signal is input from the oscillator to the drive unit, and a plurality of first resonance frequencies are obtained from frequency components received by the reception unit from the drive unit,
Each second incident signal having each first resonance frequency as a center frequency is incident on the driving unit by the oscillator, and each second reflected signal is received from the frequency component of each second reflected signal received from the driving unit by the receiving unit. Get the resonance frequency,
After the start of operation of the switchgear, each third reflected signal received by the receiving unit from the driving unit after each second incident signal having the second resonance frequency as the center frequency is incident on the driving unit by the oscillator. Obtaining each third resonance frequency from the frequency components of
An abnormality is determined from the correlation between each second resonance frequency and each third resonance frequency.
Inspection method for switchgear.

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