JP2019168300A - Diagnostic system, diagnostic device, and method for diagnosis - Google Patents

Abstract

To provide a diagnostic system, a diagnostic device, and a method for diagnosis which allow a user to know an appropriate time to clean a facility.SOLUTION: The present diagnostic system is for diagnosing a facility where an insulating object is provided, and includes: a surface resistance sensor in the facility for outputting a divided voltage, the sensor having a first surface resistor and a second surface resistor connected in series so that the voltage of a DC power source will be divided, the second surface resistor being equipped with a protective member on a surface resistor different from the first surface resistor; and a diagnosis unit for estimating the time to clean the facility on the basis of the relation between the voltage value output from the surface resistor sensor and a predetermined threshold value.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a diagnostic system, a diagnostic device, and a diagnostic method, and is suitable for application to, for example, a diagnostic system, a diagnostic device, and a diagnostic method for estimating the cleaning time of equipment.

  The high voltage distribution board is configured by connecting a number of conductors, switches, current sensors, transformers, and other devices. Predetermined equipment is manufactured so that insulation is maintained, but the surface resistance of the insulator in the high-voltage distribution board decreases because the components contained in the dust flowing in from the ventilation port accumulate and accumulate, Increased risk of dielectric breakdown. In order to remove such dielectric breakdown and foreign matters that cause the breakdown, the inside of the high-voltage distribution board is regularly cleaned at present. However, since a lot of labor is required for cleaning, there is a need for a method that can appropriately evaluate the timing of cleaning in accordance with the environmental conditions of the place where it is installed.

  Here, a comb-shaped electrode is formed on the surface of the sensor insulator made of the same material as the insulator of the power receiving and distributing equipment, installed near the vent, and the humidity near the sensor insulator surface is measured using a hygrometer to determine the surface resistance. A method of estimating the surface resistivity from the correlation between the rate and the humidity and obtaining the remaining life of the device is disclosed (see Patent Document 1).

JP 2009-8427 A

  In the technique described in Patent Document 1, it is possible to grasp the replacement time of the device by obtaining the remaining life of the device, but it is not possible to properly grasp the time (cleaning time) for cleaning the equipment such as the high voltage distribution board. There is.

  The present invention has been made in consideration of the above points, and an object of the present invention is to propose a diagnostic system, a diagnostic apparatus, and a diagnostic method that can appropriately grasp the cleaning time of equipment.

  In order to solve this problem, in the present invention, there is provided a diagnostic system for diagnosing equipment provided with an insulator, the first surface resistance and the first surface so as to divide the voltage of a DC power source. A surface resistance sensor provided in the facility, in which a second surface resistance having a protective member attached to a surface resistance different from the resistance is connected in series, and a divided voltage value is output; and the surface resistance sensor And a diagnostic unit for estimating the cleaning time of the equipment based on the relationship between the voltage value output by the above and a predetermined threshold value.

  According to the present invention, there is provided a diagnostic apparatus for diagnosing equipment provided with an insulator, wherein the equipment has a first surface resistance and the first surface so as to divide a voltage of a DC power source. A surface resistance sensor that outputs a divided voltage value is provided in series with a second surface resistance in which a protective member is attached to a surface resistance different from the resistance, and the voltage output by the surface resistance sensor A recording unit for recording value information, and a diagnosis unit for estimating the cleaning time of the equipment based on a relationship between a voltage value recorded in the recording unit and a predetermined threshold value are provided.

  According to the present invention, there is provided a diagnostic method for diagnosing a facility provided with an insulator, wherein the first surface resistance and the first surface resistance are divided so as to divide a voltage of a DC power source. A first step in which a second surface resistance having a protective member attached to another surface resistance is connected in series, and the surface resistance sensor provided in the facility outputs a divided voltage value; However, based on the relationship between the voltage value output by the surface resistance sensor and a predetermined threshold value, a second step of estimating the cleaning time of the equipment is provided.

  According to the said structure, since the cleaning time of an installation is estimated, the cleaning time of an installation can be grasped | ascertained appropriately.

  ADVANTAGE OF THE INVENTION According to this invention, the cleaning time of an installation can be grasped | ascertained appropriately.

It is a figure showing an example of composition concerning a diagnostic system by a 1st embodiment. It is a figure which shows an example of the structure which concerns on the surface resistance sensor by 1st Embodiment. It is a figure which shows the relationship between the amount of dust and surface resistance by 1st Embodiment. It is a figure which shows the relationship between the humidity and surface resistance by 1st Embodiment. It is a figure which shows an example of the process sequence which concerns on the diagnostic process by 1st Embodiment. It is a figure which shows the relationship between the age by 1st Embodiment, and the output of a surface resistance sensor. It is a figure which shows an example of the screen by 1st Embodiment.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) 1st Embodiment In FIG. 1, 1 shows the diagnostic system by 1st Embodiment as a whole. The diagnosis system 1 can diagnose and notify an appropriate cleaning time of the high voltage distribution board 100.

  The high-voltage distribution board 100 is an example of equipment provided with an insulator, and is a partition such as a high-voltage bus room 110, a circuit breaker room 120 (in this example, a circuit breaker room 120a and a circuit breaker room 120b), an inspection room 130, and the like. It is divided into. The high-pressure bus chamber 110 has a bus 111 built therein. The bus bar 111 is a high-voltage device, and is insulated and supported by an insulator (an example of an insulator). The circuit breaker chamber 120 incorporates a circuit breaker 121 (in this example, the circuit breaker 121a and the circuit breaker 121b). The circuit breaker 121 is a high-voltage device and includes an insulator that covers a switch and the like. In addition, the insulator mentioned above is an example, and the high voltage distribution board 100 may be provided with an insulator in addition.

  A call exhaust port 112 is provided in the lower portion of the high-pressure bus chamber 110, and an exhaust port 113 is provided in the upper portion of the high-pressure bus chamber 110. The high-pressure bus chamber 110 communicates with the outside. The circuit breaker chamber 120 is provided with a breathing exhaust port 122 (in this example, a breathing exhaust port 122a and a breathing exhaust port 122b) communicating with the high-pressure bus chamber 110. An expiratory port 131 through which air from the high-pressure bus chamber 110 flows is provided at the lower portion of the inspection chamber 130, and an expiratory port 132 that leads to the outside is provided at the upper portion of the inspection chamber 130.

  The inside of the high voltage distribution board 100 communicates with the outside through vent holes (exhaust vents 112 and 122, exhaust vent 113 and exhalation ports 131 and 132 described above). Through such a vent, fine foreign matter (hereinafter described by taking dust as an example) is brought into the high-voltage distribution board 100, adheres to the insulator, and the surface resistance of the insulator decreases. If the contamination due to dust is left as it is for a long time, dielectric breakdown may occur and the high-voltage distribution board 100 may stop.

  Therefore, the diagnostic system 1 includes a surface resistance sensor 10, a digital-analog converter (A / D converter) 20, a recording unit 30, a diagnostic unit 40, and a display unit 50 as a configuration for appropriately diagnosing the high-voltage distribution board 100. Consists of.

  Here, the dust that is brought into the high-voltage power distribution board 100 differs depending on the arrangement and size of the devices in the high-voltage power distribution board 100. In the present embodiment, it is preferable to install (place) the surface resistance sensor 10 at a place where deterioration (reduction in surface resistance) is most prominent from the viewpoint of preventing accidents. However, an appropriate place can be adopted as an installation place. For example, when there is a knowledge that dust is more likely to be brought into the portion where the air flow is larger, the surface resistance sensor 10 may be installed in the vicinity of the expiratory port 112 that is likely to hit air into which outside air flows. In addition, for example, when there is knowledge that the lower part of the high-voltage power distribution board 100 is more deteriorated than the upper part, the surface resistance sensor 10 may be installed at the bottom of the high-voltage power distribution board 100. In addition, when there is a section where deterioration is most likely to proceed among a plurality of sections in the high-voltage distribution board 100, the surface resistance sensor 10 may be installed in the section.

  Here, the surface resistance sensor 10 has a first surface resistance composed of an insulator and an electrode and a surface resistance different from the first surface resistance so as to divide the voltage of the DC power supply. The sensor is connected in series with the attached second surface resistance and outputs a divided voltage value. An example of the configuration of the surface resistance sensor 10 will be described later with reference to FIG. The digital-analog converter 20 is a device that converts the output (analog data) from the surface resistance sensor 10 into digital data. The recording unit 30 is a storage device that stores digital data (information) converted by the digital-analog converter 20. The diagnosis unit 40 is an information processing resource (software resource, hardware resource, or a combination thereof) that estimates the cleaning time of the high-voltage distribution board 100 from the relationship between the information recorded in the recording unit 30 and a preset threshold value. is there. An example of the processing content of the diagnosis unit 40 will be described later with reference to FIG. The display unit 50 is a display that displays a result diagnosed by the diagnosis unit 40 (for example, information related to the cleaning time of the high-voltage power distribution board 100). In other words, the surface resistance sensor 10, the digital-analog converter 20, the recording unit 30, the diagnosis unit 40, and the display unit 50 may be realized by one device or a plurality of devices. .

  FIG. 2 is a diagram illustrating an example of a configuration related to the surface resistance sensor 10. FIG. 2A shows a plan view of the surface resistance sensor 10. FIG. 2B shows a front view of the surface resistance sensor 10. FIG. 2C shows an equivalent circuit of the surface resistance sensor 10.

  The surface resistance sensor 10 is configured by connecting the surface resistances R and Rs of two insulators in series so as to divide the voltage of the DC power supply 11. The surface resistances R and Rs are composed of insulating plates 12a and 12b and electrodes 13a and 13b that are installed at a predetermined interval so that the length facing the surfaces of the insulating plates 12a and 12b becomes long. One surface resistance R (an example of a first surface resistance) is arranged so that dust collects on the insulating plate 12a and the electrode 13a, and the other surface resistance Rs (an example of a second surface resistance). In the following, the reference resistor Rs is appropriately referred to as a cover 14 so that dust does not fall on the insulating plate 12b and the electrode 13b.

  The cover 14 has a ventilation portion 15 (may be a micro filter that allows moisture to pass or a hole that allows wiring to pass through), and the reference resistance Rs is not completely sealed. There is no change in the humidity inside and outside the cover 14. The ventilation portion 15 is preferably provided on a side surface, a bottom surface, or the like other than the top surface of the cover 14 so as not to be blocked by dust. The cover 14 is described as an example of a configuration (protective member) that prevents dust from getting on the insulating plate 12b and the electrode 13b. However, the present invention is not limited to this, and the protective member is, for example, It may be a container with a lid capable of storing the reference resistance Rs.

  The magnitude of the reference resistance Rs does not depend (influence) on dust. The signal of the surface resistance sensor 10 is taken from a terminal NB connecting the two surface resistances R and Rs and notified to the digital-analog converter 20. As shown in FIG. 3, the resistance value of the surface resistance R gradually decreases with the passage of time due to the influence of dust. On the other hand, the reference resistance Rs is not lowered because it is not affected by dust. Therefore, when the voltage V of the terminal NB is, for example, V = E × R / (R + Rs), the voltage V gradually decreases due to the influence of the surface resistance R.

  FIG. 3 is a diagram illustrating the relationship between the amount of dust and the surface resistance R. FIG. 3 shows that the resistance value of the surface resistance R gradually decreases due to the influence of dust over time. Here, since the decrease in the surface resistance R also affects the humidity in addition to the amount of dust, the relationship between the humidity and the surface resistances R and Rs will be described with reference to FIG.

  FIG. 4 is a diagram showing the relationship between humidity and surface resistances R and Rs. FIG. 4 shows that even when the humidity changes, the surface resistance Rs and the surface resistance R affected by dust change at almost the same rate as time passes. That is, it can be seen that the influence of dust on the surface resistance R can be evaluated without measuring the humidity and correcting the surface resistances R and Rs.

Here, the surface resistance sensor 10 divides the voltage E of the DC power supply by the surface resistance R and the reference resistance Rs, and generates the voltage V given by (Equation 1) as a signal value at the terminal NB.
V = E × R / (R + Rs) (Formula 1)

  Since the cover 14 is attached to the reference resistance Rs, it is not affected by dust, but since the cover 14 is not attached to the surface resistance R, the resistance value is affected by the influence of dust and with time. Becomes lower. Therefore, by using (Equation 1), it is possible to measure the degree of decrease in the surface resistance R due to dust as a voltage value without directly measuring the surface resistance value.

  In the example of FIG. 2, the surface resistance R and the reference resistance Rs are surface resistances made of the same or substantially the same material and shape, and therefore, in the initial stage, R≈Rs and a sensor V = 0.5E Output appears at terminal NB.

  As described above, it is necessary to carry out cleaning before the surface resistance of the insulator in the high-voltage distribution board 100 is reduced due to contamination by dust, resulting in dielectric breakdown. Below, the process (diagnosis process) which diagnoses the cleaning time of the high voltage distribution board 100 is demonstrated using FIGS.

  FIG. 5 is a diagram illustrating an example of a processing procedure related to the diagnostic processing.

  In step S <b> 1, the surface resistance sensor 10 measures the voltage V (analog data) divided by the reference resistance Rs and the surface resistance R and notifies the digital-analog converter 20 of the voltage.

  In step S <b> 2, the digital-analog converter 20 converts the measured voltage V (analog data) into digital data and stores it in the recording unit 30.

  Here, a method for determining an appropriate cleaning time (cleaning timing) will be described with reference to FIG.

  FIG. 6 is a diagram showing the relationship between the age and the output V (voltage V) of the surface resistance sensor 10. When the horizontal axis is the time t from the initial cleaning time and the output V of the surface resistance sensor 10 is the vertical axis, the output V is an approximated curve (predetermined curve) from the output V measured from the initial time to the present time. It is assumed that it can be expressed by an approximate expression.

  In this case, since the approximate curve is an estimation (estimation) of the future (future) output of the surface resistance sensor 10, the intersection of the approximate curve and a predetermined threshold value Vc indicating a voltage that needs to be cleaned is obtained. Time is the recommended cleaning time (recommended cleaning time tc).

In step S3, the diagnosis unit 40 obtains an approximate expression based on the actual measurement data. For example, the diagnosis unit 40 obtains a primary regression line shown in (Equation 2) from measured data from the initial time t = 0 to the current time t = t ′ by using the least square method, and the coefficient a of the primary regression line And Vo are determined.
V = a · t + Vo (Formula 2)

In step S4, the diagnosis unit 40 calculates (estimates) the time at the intersection of the obtained approximate expression and the preset threshold value Vc as the recommended cleaning time tc. For example, the diagnosis unit 40 calculates the recommended cleaning time tc using (Equation 3).
tc = (Vc−Vo) / a (Formula 3)

  Here, when monitoring a plurality of high voltage distribution boards 100, by providing the surface resistance sensor 10 in each of the high voltage distribution boards 100, it is possible to appropriately evaluate the cleaning time of each of the plurality of high voltage distribution boards 100. .

  In step S5, the diagnosis unit 40 is monitoring a plurality of high-voltage distribution boards 100 (for example, when the surface resistance sensor 10 and the digital-analog converter 20 are provided on each of the plurality of high-voltage distribution boards 100). The recommended cleaning time tc of each high-voltage power distribution panel 100 is compared, and the one with the smallest recommended cleaning time tc is set as a representative value.

  In step S6, the diagnosis unit 40 displays information related to the recommended cleaning time tc on the display unit 50. The information related to the recommended cleaning time tc may be the time from the current time to cleaning, the recommended cleaning time tc, or a representative value, which can be calculated from the recommended cleaning time tc. Other information may also be used.

  FIG. 7 is a diagram illustrating an example of a screen 51 displayed on the display unit 50. In FIG. 1-No. 4 shows an example of a case in which the cleaning time of the four high-voltage distribution boards 100 is diagnosed. From the measurement result of the surface resistance sensor 10 contained one by one in the high voltage distribution board 100, the time (tc−t ′) from the present time to the cleaning for each high voltage distribution board 100 is displayed using (Equation 3). It is displayed at the locations 52a to 52d. Further, the time (tc−t ′) until the cleaning of each high-voltage distribution board 100 is compared, and the latest time is displayed at the display location 53 as a representative value of the time until the cleaning.

  In step S <b> 7, the diagnosis unit 40 adjusts the threshold value Vc so as to be based on the results in accordance with the input from the worker. For example, the operator measures the actual surface resistance of the insulator in the high-voltage distribution board 100 at the estimated cleaning time, and when the actual surface resistance value is lower than the threshold value Vc used for estimation, the threshold value Vc is set. If the actual surface resistance value is higher than the threshold value Vc used for estimation, an input is made to the diagnosis unit 40 so as to set the threshold value Vc lower. In addition, it is not restricted to this structure, based on the actual surface resistance value of the insulator in the high voltage distribution board 100 measured by the operator, the diagnosis unit 40 determines that the actual surface resistance value is, for example, If the threshold value Vc is lower than the threshold value Vc used for estimation, the threshold value Vc may be set higher. If the actual surface resistance value is higher than the threshold value Vc used for estimation, the threshold value Vc may be set lower. According to this adjustment, the cleaning time of the high voltage distribution board 100 can be grasped more accurately.

  In step S8, the operator removes the dust adhering to the surface of the insulator of the surface resistance R of the surface resistance sensor 10 with a waste cloth, an air duster, etc. during cleaning, and the surface resistance R value is the same as the reference resistance Rs value. Restore to a degree.

  According to the above configuration, the amount of dust in the equipment is quantified by looking at the change in the surface resistance of the insulator, and the optimum cleaning time can be notified. Equipment maintenance can be performed at a frequency of cleaning.

(2) Other Embodiments In the above-described embodiment, the case where the present invention is applied to the diagnostic system 1 has been described. However, the present invention is not limited thereto, and various other diagnostic systems, The present invention can be widely applied to diagnostic devices and diagnostic methods.

  In the above-described embodiment, the recording unit 30, the diagnostic unit 40, and the display unit 50 may be realized by a computer (an example of a diagnostic device) such as a notebook computer or a tablet terminal. In this case, the computer includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a HDD (Hard Disk Drive), a display, etc. (not shown). The function of the computer (for example, the diagnosis unit 40) may be realized by, for example, the CPU reading a program stored in the ROM into the RAM and executing it (software), or by hardware such as a dedicated circuit. Alternatively, it may be realized by combining software and hardware. Also, some of the functions of the computer may be realized by another computer that can communicate with the computer.

  In the above description, information such as programs, tables, and files for realizing each function is stored in a storage 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. Can be put in.

  In the above-described embodiment, the case where one surface resistance sensor 10 is provided in the high voltage distribution board 100 has been described. However, the present invention is not limited to this, and a plurality of surface resistance sensors 10 are provided in the high voltage distribution board 100. You may be made to do. For example, the surface resistance sensor 10 may be provided for each section of the surface resistance sensor 10 on the high-voltage distribution board 100, the surface resistance sensor 10 may be provided for each vent, or for each insulator (for example, insulation) The surface resistance sensor 10 may be provided in the vicinity of the object. In this case, the recommended cleaning time tc of each surface resistance sensor 10 may be compared, and the value with the smallest recommended cleaning time tc may be used as the representative value. According to such a configuration, the cleaning timing of the facility can be grasped more accurately. When the surface resistance sensor 10 is provided for each insulator, it is preferable that the insulator and the insulating plates 12a and 12b in the surface resistance sensor 10 are the same material.

  In the above-described embodiment, the case where the electrodes 13a and 13b are provided on the surfaces of the insulating plates 12a and 12b has been described. However, in the present invention, the shape of the insulator provided with the electrodes 13a and 13b is a plate-like shape. Not limited to any shape (insulator) can be used.

  In addition, the above-described configuration may be changed, rearranged, combined, or omitted as appropriate without departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Diagnosis system, 10 ... Surface resistance sensor, 20 ... Digital-analog converter, 30 ... Recording part, 40 ... Diagnosis part, 50 ... Display part, 100 ... High voltage distribution board.

Claims (6)

A diagnostic system for diagnosing equipment provided with an insulator,
A first surface resistance and a second surface resistance in which a protective member is attached to a surface resistance different from the first surface resistance are connected in series and divided so as to divide the voltage of the DC power supply. A surface resistance sensor provided in the facility,
Based on the relationship between the voltage value output by the surface resistance sensor and a predetermined threshold value, a diagnostic unit that estimates the cleaning time of the facility;
A diagnostic system comprising: The diagnostic unit adjusts the threshold based on a surface resistance of an insulator provided in the facility measured at the time of cleaning the facility.
The diagnostic system according to claim 1. The surface resistance sensor is provided near a vent in the facility.
The diagnostic system according to claim 1. A display unit for displaying information related to the cleaning time of the equipment estimated by the diagnostic unit;
The diagnostic system according to claim 1. There is a diagnostic device for diagnosing equipment equipped with insulation,
In the facility, a first surface resistance and a second surface resistance in which a protective member is attached to a surface resistance different from the first surface resistance so as to divide the voltage of the DC power supply are connected in series. A surface resistance sensor that outputs a divided and divided voltage value is provided,
A recording unit for recording information on a voltage value output by the surface resistance sensor;
Based on the relationship between the voltage value recorded in the recording unit and a predetermined threshold value, a diagnostic unit that estimates the cleaning time of the facility;
A diagnostic apparatus comprising: A diagnostic method for diagnosing equipment provided with an insulator,
A first surface resistance and a second surface resistance in which a protective member is attached to a surface resistance different from the first surface resistance are connected in series so as to divide the voltage of the DC power supply, A surface resistance sensor provided in the first step of outputting a divided voltage value;
A diagnostic unit that estimates a cleaning time of the equipment based on a relationship between a voltage value output by the surface resistance sensor and a predetermined threshold;
A diagnostic method comprising:

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