JP7000219B2 - Diagnostic system, diagnostic device, and diagnostic method - Google Patents

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 a cleaning time of equipment.

The high-voltage switchboard is configured by connecting a large 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 insulation in the high-voltage switchboard decreases due to the accumulation of components contained in the dust flowing in from the ventilation port. The risk of dielectric breakdown increases. At present, the inside of the high-voltage switchboard is regularly cleaned in order to remove such dielectric breakdown and foreign substances that cause it. However, since cleaning requires a great deal of labor, there is a need for a method that can appropriately evaluate the timing of cleaning according to 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 distribution device, installed near the ventilation port, and the humidity near the surface of the sensor insulator is measured using a hygrometer to measure the surface resistivity. 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).

Japanese Unexamined Patent Publication No. 2009-8427

In the technique described in Patent Document 1, the replacement time of the equipment can be grasped by obtaining the remaining life of the equipment, but the problem that the timing of cleaning the equipment such as the high-voltage switchboard (cleaning time) cannot be properly grasped. 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 device, and a diagnostic method capable of appropriately grasping the cleaning time of equipment.

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

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

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

According to the above configuration, the cleaning time of the equipment is estimated, so that the cleaning time of the equipment can be appropriately grasped.

According to the present invention, it is possible to appropriately grasp the cleaning time of the equipment.

It is a figure which shows an example of the structure which concerns on the diagnosis system by 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 the surface resistance by 1st Embodiment. It is a figure which shows the relationship between the humidity and the surface resistance by 1st Embodiment. It is a figure which shows an example of the processing procedure which concerns on the diagnostic processing by 1st Embodiment. It is a figure which shows the relationship between the age and the output of a surface resistance sensor by 1st Embodiment. It is a figure which shows an example of the screen by 1st Embodiment.

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

(1) First Embodiment In FIG. 1, 1 shows a diagnostic system according to the first embodiment as a whole. The diagnostic system 1 can diagnose and notify the appropriate cleaning time of the high-voltage switchboard 100.

The high-voltage switchboard 100 is an example of equipment provided with an insulator, and is a section such as a high-voltage bus room 110, a circuit breaker room 120 (in this example, the circuit breaker room 120a and the circuit breaker room 120b), and an inspection room 130. It is divided into. The high-voltage bus chamber 110 has a built-in bus 111. The bus 111 is a high-voltage device, and is insulated and supported by an insulator (an example of an insulator). The circuit breaker chamber 120 contains 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 is configured to include an insulator that covers a switch or the like. The above-mentioned insulating material is an example, and the high-voltage power receiving / distributing board 100 may be provided with another insulating material.

An exhaust port 112 is provided in the lower part of the high-pressure bus chamber 110, an exhaust port 113 is provided in the upper part of the high-pressure bus chamber 110, and the high-voltage 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-voltage bus chamber 110. An exhalation port 131 through which air from the high-voltage bus chamber 110 flows is provided in the lower part of the inspection room 130, and an exhalation port 132 leading to the outside is provided in the upper part of the inspection room 130.

The inside of the high-voltage power receiving / distributing board 100 communicates with the outside through ventilation ports (exhalation / exhaust ports 112, 122, exhaust ports 113, and exhalation ports 131, 132 described above). Through such a vent, fine foreign matter (hereinafter, dust will be described as an example) is brought into the high-voltage power receiving / distributing board 100, adheres to the insulating material, and the surface resistance of the insulating material decreases. If the pollution caused by dust is left as it is for a long period of time, dielectric breakdown may occur and the high-voltage switchboard 100 may stop.

Therefore, the diagnostic system 1 includes a surface resistance sensor 10, a digital-to-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 switchboard 100. Consists of.

Here, the dust that is brought into the high-voltage switchboard 100 tends to collect in different places depending on the arrangement and size of the devices in the high-voltage switchboard 100. In the present embodiment, it is preferable to install (arrange) the surface resistance sensor 10 in a place where deterioration (decrease in surface resistance) is most advanced, standing on the safety side from the viewpoint of preventing accidents. However, an appropriate place can be adopted as the installation place. For example, if it is known that the larger the air flow is, the easier it is for dust to be brought in, the surface resistance sensor 10 may be installed in the vicinity of the expiratory / exhaust port 112 where the outside air is likely to come into contact with the inflowing air. Further, for example, if it is known that the lower part of the high-voltage power receiving / distributing board 100 deteriorates more than the upper part, the surface resistance sensor 10 may be installed at the bottom of the high-voltage power receiving / distributing board 100. Further, if the section in which the deterioration is most likely to proceed is known among the plurality of sections in the high-voltage switchboard 100, the surface resistance sensor 10 may be installed in the section.

Here, the surface resistance sensor 10 has a protective member on 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. It is a sensor that is connected in series with the attached second surface resistance and outputs the divided voltage value. An example of the configuration of the surface resistance sensor 10 will be described later with reference to FIG. The digital-to-analog converter 20 is a device that converts the output (analog data) of 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-to-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 switchboard 100 from the relationship between the information recorded in the recording unit 30 and the preset threshold value. be. An example of the processing content of the diagnostic unit 40 will be described later with reference to FIG. The display unit 50 is a display that displays the result diagnosed by the diagnosis unit 40 (for example, information related to the cleaning time of the high-voltage power receiving / distributing board 100). In addition, the surface resistance sensor 10, the digital-to-analog converter 20, the recording unit 30, the diagnostic unit 40, and the display unit 50 may be realized by one device or may be realized by a plurality of devices. ..

FIG. 2 is a diagram showing an example of the 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 to connect 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 installed at regular intervals so that the lengths facing the surfaces of the insulating plates 12a and 12b are long. One surface resistance R (an example of the first surface resistance) is arranged so that dust can be deposited on the insulating plate 12a and the electrode 13a, and the other surface resistance Rs (an example of the second surface resistance) is an example. Hereinafter, the reference resistance Rs will be appropriately referred to as), and the cover 14 is covered on the insulating plate 12b and the electrode 13b so that dust does not accumulate.

The cover 14 has a ventilation portion 15 (which may be a microfilter that allows moisture to pass through, or a hole that allows wiring or the like 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. It is preferable that the ventilation portion 15 is provided on a side surface, a bottom surface, or the like other than the upper surface of the cover 14 so as not to be blocked by dust. The cover 14 has been described as an example of a configuration (protective member) for preventing dust from accumulating on the insulating plate 12b and the electrode 13b, but the present invention is not limited to this, and the protective member may be, for example. It may be a container with a lid that can store the reference resistance Rs.

The magnitude of the reference resistance Rs does not depend on (influence) the dust. The signal of the surface resistance sensor 10 is taken from the terminal NB connecting the two surface resistances R and Rs and notified to the digital-to-analog converter 20. As shown in FIG. 3, 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 does not decrease 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 showing the relationship between the amount of dust and the surface resistance R. In FIG. 3, it is shown that the surface resistance R is affected by dust with the passage of time, and the resistance value gradually decreases. Here, since the decrease in surface resistance R is affected by humidity in addition to the amount of dust, the relationship between humidity and 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 if the humidity changes, the surface resistance Rs and the surface resistance R affected by dust change at almost the same rate with the passage of time. 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) at the terminal NB as a signal value.
V = E × R / (R + Rs) ・ ・ ・ (Equation 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, it is affected by dust and the resistance value with the passage of time. Will be low. Therefore, by using (Equation 1), it is possible to measure the degree of decrease in surface resistance R due to dust as a voltage value without directly measuring the surface resistance value.

In the example of FIG. 2, since the surface resistance R and the reference resistance Rs are surface resistances having the same or substantially the same material and shape, in the initial stage, R≈Rs and V = 0.5E. The 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 switchboard 100 decreases due to the contamination by dust and the insulation breaks down. Hereinafter, a process (diagnosis process) for diagnosing the cleaning time of the high-voltage switchboard 100 will be described with reference to FIGS. 5 to 7.

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

In step S1, 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-to-analog converter 20.

In step S2, the digital-to-analog converter 20 converts the measured voltage V (analog data) into digital data and stores it in the recording unit 30.

Here, a method of 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 time t from the initial time of cleaning is the horizontal axis and the output V of the surface resistance sensor 10 is the vertical axis, from the output V actually measured from the initial time to the present time, the output V is an approximate curve (predetermined). It is assumed that it can be expressed by an approximate formula).

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 the predetermined threshold Vc indicating the voltage requiring cleaning The time is the recommended cleaning time (recommended cleaning time ct).

In step S3, the diagnostic unit 40 obtains an approximate expression based on the actually measured data. For example, the diagnostic unit 40 obtains the linear regression line shown in (Equation 2) from the measured data from the initial t = 0 to the current t = t'using the least squares method, and the coefficient a of the linear regression line a. And Vo are determined.
V = a ・ t + Vo ・ ・ ・ (Equation 2)

In step S4, the diagnostic unit 40 calculates (estimates) the time of the intersection of the obtained approximate expression and the preset threshold value Vc as the recommended cleaning time ct. For example, the diagnostic unit 40 calculates the recommended cleaning time ct using (Equation 3).
tk = (Vc-Vo) / a ... (Equation 3)

Here, when monitoring a plurality of high-voltage distribution boards 100, by providing a surface resistance sensor 10 in each high-voltage distribution board 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 diagnostic unit 40 monitors a plurality of high-voltage distribution boards 100 (for example, when each of the plurality of high-voltage distribution boards 100 is provided with a surface resistance sensor 10 and a digital-to-analog converter 20). , The recommended cleaning time ct of each high-voltage switchboard 100 is compared, and the one with the smallest recommended cleaning time ct is used as a representative value.

In step S6, the diagnostic unit 40 displays information related to the recommended cleaning time ct on the display unit 50. The information related to the recommended cleaning time ct may be the time from the present time to cleaning, the recommended cleaning time ct, a representative value, or can be calculated from the recommended cleaning time ct. Other information may be used.

FIG. 7 is a diagram showing an example of the screen 51 displayed on the display unit 50. In FIG. 7, No. 1 to No. An example of the case where the cleaning time of the four high-voltage distribution boards 100 of 4 is diagnosed is shown. From the measurement results of the surface resistance sensors 10 contained in the high-voltage switchboard 100 one by one, the time (tc-t') from the present time to cleaning for each high-voltage switchboard 100 is displayed using (Equation 3). It is displayed at places 52a to 52d. Further, the time until cleaning (tc-t') of each high-voltage switchboard 100 is compared, and the most recent time is displayed at the display location 53 as a representative value of the time until cleaning.

In step S7, the diagnostic unit 40 adjusts the threshold value Vc according to the input from the operator so as to be based on the actual results. For example, the operator measures the actual surface resistance of the insulator in the high-voltage switchboard 100 at the estimated cleaning time, and if the actual surface resistance value is lower than the threshold value Vc used for estimation, the threshold value Vc is set. When the value is set high and the actual surface resistance value is higher than the threshold value Vc used for estimation, an input is made to the diagnostic unit 40 so as to set the threshold value Vc low. It should be noted that the configuration is not limited to this, and the diagnostic unit 40, for example, the actual surface resistance value is higher based on the actual surface resistance value of the insulator in the high-voltage power receiving / distributing board 100 measured by the operator. If it is lower than the threshold value Vc used for estimation, the threshold value Vc may be set high, and if the actual surface resistance value is higher than the threshold value Vc used for estimation, the threshold value Vc may be set low. With this adjustment, it becomes possible to more accurately grasp the cleaning time of the high-voltage distribution board 100.

In step S8, the operator removes 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, or the like at the time of cleaning, and the value of the surface resistance R is the same as the value of the reference resistance Rs. Recover to a degree.

According to the above configuration, the amount of dust in the equipment can be quantified by observing the change in the surface resistance of the insulator, and the optimum cleaning time can be notified. It is possible to maintain the equipment at the 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, but the present invention is not limited to this, and various other diagnostic systems. It can be widely applied to diagnostic devices and diagnostic methods.

Further, 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), an HDD (Hard Disk Drive), a display, and the like, which are not shown. The function of the computer (for example, the diagnostic unit 40) may be realized by, for example, the CPU reading the program stored in the ROM into the RAM and executing it (software), or by hardware such as a dedicated circuit. It may be realized by combining software and hardware. In addition, some of the functions of the computer may be realized by another computer capable of communicating with the computer.

In addition, the information such as programs, tables, and files that realize each function in the above description includes a memory, a hard disk, a storage device such as an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD. Can be placed in.

Further, in the above-described embodiment, the case where one surface resistance sensor 10 is provided on the high-voltage switchboard 100 has been described, but the present invention is not limited to this, and the high-voltage switchboard 100 is provided with a plurality of surface resistance sensors 10. You may be able to do it. For example, the high-voltage power receiving / distributing board 100 may be provided with a surface resistance sensor 10 for each section of the surface resistance sensor 10, a surface resistance sensor 10 may be provided for each vent, or each insulation (for example, insulation). A surface resistance sensor 10 may be provided near an object). In this case, the recommended cleaning time ct of each surface resistance sensor 10 may be compared, and the one with the smallest recommended cleaning time ct may be used as a representative value. According to such a configuration, the cleaning timing of the equipment 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 substance.

Further, 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, but in the present invention, the shape of the insulator provided with the electrodes 13a and 13b is plate-shaped. Not limited to this, any shape (insulator) can be used.

Further, the above-mentioned configuration may be appropriately changed, rearranged, combined, or omitted as long as it does not exceed the gist of the present invention.

1 ... Diagnostic system, 10 ... Surface resistance sensor, 20 ... Digital-to-analog converter, 30 ... Recording unit, 40 ... Diagnostic unit, 50 ... Display unit, 100 ... High voltage power receiving and distribution board.

Claims (6)

It is a diagnostic system that diagnoses equipment with insulation.
A first surface resistance and a second surface resistance having a protective member 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 installed in the equipment that outputs the voltage value
A diagnostic unit that estimates the cleaning time of the equipment based on the relationship between the voltage value output by the surface resistance sensor and a predetermined threshold value.
A diagnostic system characterized by being equipped with. The diagnostic unit adjusts the threshold value based on the surface resistance of the insulator provided in the equipment measured at the time of cleaning the equipment.
The diagnostic system according to claim 1. The surface resistance sensor is provided near a vent in the equipment.
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 is provided.
The diagnostic system according to claim 1. There is a diagnostic device that diagnoses equipment with insulation,
In the facility, a first surface resistance and a second surface resistance having a protective member 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 that is connected and outputs the divided voltage value is provided.
A recording unit that records information on the voltage value output by the surface resistance sensor, and a recording unit.
A diagnostic unit that estimates the cleaning time of the equipment based on the relationship between the voltage value recorded in the recording unit and a predetermined threshold value.
A diagnostic device characterized by being provided with. It is a diagnostic method for diagnosing equipment with insulation.
A first surface resistance and a second surface resistance having a protective member 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, and the inside of the facility. The surface resistance sensor provided in the first step of outputting the divided voltage value, and
A second step in which the diagnostic unit estimates the cleaning time of the equipment based on the relationship between the voltage value output by the surface resistance sensor and a predetermined threshold value.
A diagnostic method characterized by comprising.

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