JP2012103270A - Diagnostic method for electrically-powered apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diagnostic method for a control rod drive device, in which diagnosis of the control rod drive device can be carried out by an easier technique.SOLUTION: In an inventive diagnostic method for electrically-powered apparatuses, magnetic signals generated from power lines energizing the plurality of electrically-powered apparatuses are obtained by a plurality of magnetic field sensors arranged at sections where the geometric relative positions of the magnetic field sensors with respect to the power lines in a conduit housing the power lines are not changed, and electric signals corresponding to the obtained magnetic signals are used for diagnosis of the electrically-powered apparatuses. Work for specifying a magnetic field sensor which detects the highest level signal when a reference current flows in one power line of the plurality of power lines, as a magnetic field sensor corresponding to the one power line is performed for each of the plurality of power lines, and the correspondence relation is held as a database and used for the diagnosis of the electrically-powered apparatuses.

Description

  The present invention relates to a diagnosis method for diagnosing an electric device such as an electric valve.

  For example, when diagnosing an electric device driven by the rotational force of an electric motor or the magnetic driving force of an electromagnetic coil, it is important to accurately know the amount of electricity input to the electric device.

  As a method for acquiring the amount of electricity input to such an electric device, for example, the lid of the electric box provided for energizing the electric motor is opened, and the electric amount is measured on the power line stored in the electric box. A method of measuring a current value or the like by attaching a device, or a method of measuring a current value by attaching a clamp-type current sensor for detecting a current passed through a power cable of an electric motor, as disclosed in Patent Document 1. Are known.

JP 2002-130531 A.

  However, the former method, in which an electrical quantity measuring instrument is attached to the power line in the electrical box and the current value is measured, requires that the electrical box cover be opened each time measurement is performed, and the installation work of the measuring instrument is complicated. There are problems such as poor workability, the possibility of an electric shock from the operator during the mounting operation of the measuring instrument or the measuring work using the measuring instrument, and the possibility of a ground fault or short circuit.

  In addition, since the electric box in which the measuring device is installed is separated from the electric motor and the electric device driven by the electric box, the electric device is diagnosed using only acquired information acquired by the measuring device. In such a case, there is not much problem. However, for example, when it is necessary to correlate the acquired information with other information on the electric device side, it becomes a problem.

  On the other hand, in the method using the clamp type current sensor, it is not possible to perform the measurement by attaching the current sensor from the outside of the conduit containing the power cable. For example, the electric box is opened and directly connected to the electric cable of the power cable. There is a problem that it is necessary to attach a current sensor, and the measurement work becomes complicated.

  Further, in the case where a plurality of electric devices are provided and the electric power lines energizing each electric device are accommodated in a single conduit, when measuring the electric amount input to each electric device, the measured electric amount Although it is necessary to accurately determine which electric device the signal is from, no effective means for this has been proposed.

  Therefore, the present invention proposes a diagnosis method for an electric device that can easily, safely and accurately acquire the amount of electricity input to the electric device and perform various diagnoses of the electric device based on the acquired information. It was made for the purpose.

  In the present invention, the following specific configuration is adopted as a specific means for solving such a problem.

  In the diagnostic method for an electric device according to the first invention of the present application, a plurality of electric devices arranged at portions where the geometric relative position with respect to the electric power line does not change in a conduit that stores electric power lines that are energized to the electric devices. In the method for diagnosing an electric device that uses a magnetic field sensor to acquire a magnetic signal generated from each of the power lines and uses an electric signal corresponding to the magnetic signal for diagnosis of the electric device, a reference current is applied to one of the plurality of power lines. The plurality of power lines, the plurality of magnetic field sensors and the plurality of power lines by performing an operation for specifying the magnetic field sensor that has detected the highest level signal as a magnetic field sensor corresponding to the one power line, for each of the plurality of power lines. The correspondence relationship is specified, and this correspondence relationship is stored as a database and used for diagnosis of the electric device.

  In the electric device diagnosis method according to the second invention of the present application, in the electric device diagnosis method according to the first invention, an electric signal corresponding to the amount of electricity input to the electric device and the electric device are obtained. When diagnosing an electric device based on a correlation with other physical quantities, the magnetic signal obtained by measurement with the magnetic signal as a reference magnetic signal and referring to a correlation database of reference electric signals corresponding to the reference magnetic signal The electrical signal corresponding to the signal is acquired, and the electrical signal and the other physical quantity are respectively displayed as waveform signals. Appropriate timing of generation between these waveform signals, or each waveform signal displayed repeatedly The diagnosis is performed based on a deviation from an average value of all waveform signals in all repetition periods.

  In the diagnostic method for electric devices according to the third invention of the present application, in the electric device diagnosis method according to the first invention, the electric device is composed of a plurality of electric parts, and for each power line corresponding to each of the electric parts. When the electric device is diagnosed based on the correlation between the electric signal and another physical quantity obtained on the electric device side, the reference magnetic field is obtained. With reference to the correlation database of the reference electrical signal corresponding to the signal, the electrical signal corresponding to the magnetic signal obtained by measurement is acquired, and each of the electrical signal and the other physical quantity is displayed as a waveform signal, Based on the appropriateness of the generation timing between the waveform signals for each motorized part, or the deviation between each waveform signal displayed repeatedly and the average value of all the waveform signals in all repetition periods. Stomach is characterized by making a diagnosis.

  According to a fourth aspect of the present invention, there is provided a diagnostic method for an electric device according to the third aspect of the present invention, wherein any one of the waveform signals based on the electric signals is a reference waveform. And obtaining the operation parameters of each electric motor unit based on the waveform signals and the other physical quantities with reference to a specific waveform point of the reference waveform, and analyzing the operation parameters. It is characterized by making a diagnosis.

  Here, the above-mentioned “other physical quantity on the electric device side” is a physical quantity generated with the operation of the electric device, and when the electric device is, for example, an electric valve driven by the rotational force of the electric motor. The yoke stress generated in the yoke, the valve stem stress generated in the valve stem, and the like correspond to this, and in the case of a nuclear reactor control rod driving device driven by the magnetic driving force of the electromagnetic coil, The vibration (sound) accompanying the movement of the control rod corresponds to this.

  The waveform signal corresponding to the electric signal is a state quantity corresponding to the input electric quantity to each electric unit, and the waveform signal corresponding to the other physical quantity corresponds to the output on each electric unit side. Therefore, by checking the generation timing between these waveform signals, it is possible to easily diagnose whether or not each of the electric parts is operating at an appropriate operation timing.

  Further, by checking the deviation between each waveform signal displayed repeatedly and the average value of all the waveform signals in all repetition periods, it can be determined whether or not an improper operation has occurred during the operation period of the control rod drive device. It can be easily diagnosed.

  On the other hand, if the power source is a three-phase alternating current, the power line includes three electric wires (U-phase electric wire, V-phase electric wire, and W-phase electric wire), and a magnetic field is formed by each of these electric wires. Sensed by the magnetic field sensor, a signal corresponding to the magnitude is output. In this case, since the magnitude of the magnetic field sensed by the magnetic field sensor becomes smaller as the distance from each electric wire becomes longer, for example, in the measurement with a single magnetic field sensor, the attachment position of the magnetic field sensor with respect to the conduit (In other words, depending on the mounting position of the magnetic field sensor with respect to each electric wire UVW of the power line), it may be difficult to obtain a magnetic signal corresponding to the amount of electricity flowing through each electric wire.

  Further, even when the arrangement position of the power line (each electric wire UVW) in the electric pipe (the arrangement position in the in-plane position orthogonal to the pipe axis of the electric pipe) is unknown and the sensitivity of the magnetic field sensor with respect to each electric wire is different, this By arranging a plurality of magnetic field sensors in the part where the geometrical relative position between the conduit and the power line does not change, and adopting the sum of the magnetic signals obtained by each of these magnetic field sensors as the magnetic signal, the magnetic signal is reliably transmitted. It is also known to be obtained.

  As the “magnetic field sensor”, for example, a magnetic field sensor using a hall element or an amorphous element that detects a magnetic field generated from a power line in the conduit and outputs a signal corresponding to the magnitude of the magnetic field (magnetic signal) is adopted. Is done.

  The “magnetic signal” acquired by the magnetic field sensor is not limited to the magnetic signal itself, but includes a signal based on a magnetic signal such as an integrated magnetic signal obtained by integrating the magnetic signal. The “reference magnetic signal” is a magnetic signal acquired by the magnetic field sensor when a reference current is supplied to the motor unit. In addition, the amount of electricity corresponding to the reference current at this time is a “reference electrical signal”, and this “electrical signal” is a concept including not only the current and the integrated current obtained by integrating the current but also the electrical signal based on them. .

  Furthermore, it is known that the magnitude “H” of the magnetic field is proportional to the current “I” flowing through the power line and inversely proportional to the distance (r) from the power line (H∝I / 2πr). Therefore, the magnetic signal “G” output corresponding to the magnitude of the magnetic field and the current “I” flowing through the power line are in a proportional relationship, and thus the correlation between the magnetic signal “G” and the current “I” is acquired as a database. Then, based on this database, the current current “I” corresponding to the magnetic signal “G” acquired by measurement can be acquired. Further, from the proportional relationship between the magnetic signal “G” and the current “I”, it can be said that the integrated value “ΣG” of the magnetic signal and the integrated value “ΣI” of the current value are also in the proportional relationship “ΣG∝ΣI”.

  From the above, the correlation database of the reference magnetic signal acquired by the plurality of magnetic field sensors arranged in the portion where the geometric relative position with the power line in the conduit does not change and the reference electric signal corresponding to the reference magnetic signal If acquired, the electrical signal corresponding to the magnetic signal acquired by measurement can be acquired by referring to the correlation database from the next time onward.

  Further, the operation specifications of the electric parts are, for example, the operation continuation time of each of the plurality of electric parts, the overlapping period of the operations of the plurality of electric parts, etc. Therefore, these operation parameters are analyzed. As a result, the operation characteristics of the entire control rod driving device can be grasped more easily and accurately.

  In each invention of the present application, the following effects can be obtained.

(1) Diagnosis is performed based on the correlation between an electric signal corresponding to the amount of electricity input to the electric device and another physical quantity obtained on the electric device side, and the electric input to the electromagnetic coil The diagnosis can be performed based on the correlation between the electrical signal corresponding to the quantity and the vibration (acceleration) sensor during the operation of the control rod drive device, and the diagnosis operation can be performed more easily, quickly and accurately.

(2) The correlation database of the reference magnetic signal and the corresponding reference electrical signal can be obtained by a simple means of arranging the plurality of magnetic field sensors on the conduit, and the next time and later are measured based on the correlation database. Since the electric signal corresponding to the acquired magnetic signal is acquired, the following effects can be obtained.

  (2-1) For example, it is necessary to modify the electric box as in the conventional method of measuring the current value by attaching an electric quantity measuring device to the electric wire in the electric box, or the electric shock or ground fault during the work. Alternatively, an electric signal can be obtained simply, quickly and safely without any danger such as a short circuit.

  (2-2) Since the plurality of magnetic field sensors are arranged in a portion where the geometric relative position with the power line in the conduit does not change, the positional relationship between the magnetic field sensor and the power line is maintained constant and stable. It is possible to obtain a highly reliable measurement result.

  (2-3) Acquisition of an electric signal based on measurement by the magnetic field sensor and acquisition of other physical quantities on the electric device side can be performed together in the vicinity of the electric device, and comparison and confirmation of both of them can be easily performed. Therefore, for example, it is easier to collect the electrical signals and other physical quantities, and to confirm the comparison between them, as compared with the case where the electrical signals are in the electrical panel part and the other physical quantities are in the electric equipment part. As a result, the diagnosis based on the correlation between the electrical signal and the other physical quantity, for example, the propriety of the transmission efficiency of the driving force in the electric part, the change tendency of the transmission efficiency, etc. can be easily and quickly performed. In addition, it can be performed with high reliability.

  (4) Whether each of the electric devices is operating at an appropriate operation timing by displaying the electric signal and the other physical quantity as waveform signals, and confirming the appropriateness of the generation timing between the waveform signals. It is possible to easily diagnose whether or not, speeding up diagnosis and improving diagnosis accuracy. In addition, by checking the deviation between each waveform signal that is displayed repeatedly and the average value of all the waveform signals over the entire repetition period, it is easy to determine whether an inappropriate operation has occurred during the operation period of the electric device. Diagnosis can be made, and diagnosis can be speeded up and diagnosis accuracy can be improved. Therefore, this diagnostic method determines whether the operation timing of the motor unit at each step is appropriate or not by visual inspection in the electric device, or whether the motor unit is operating properly within the entire range of repeated steps. It is suitable when it is adopted as a diagnostic method in a “stepping test” in which is visually determined.

  (5) In the case where the electric signal is acquired for each power line corresponding to each of the plurality of electric units, the electric signals and the other physical quantities are displayed as waveform signals, and the electric units are By confirming the generation timing between the waveform signals, it is possible to easily diagnose whether or not each of the electric motors is operating at an appropriate operation timing. Further, by performing diagnosis based on the deviation between each waveform signal displayed repeatedly and the average value of all the waveform signals in all repetition periods, each of the motorized parts is inappropriate during the operation period. Whether or not an operation has occurred can be easily diagnosed, and as a result, the accuracy and reliability of the diagnosis can be further improved. Therefore, this diagnostic method determines whether the operation timing of the motor unit at each step is appropriate or not by visual inspection in the electric device, or whether the motor unit is operating properly within the entire range of repeated steps. It is suitable for use as a diagnostic method in a “stepping test” that is judged visually.

  (6) One of the waveform signals based on each of the electrical signals is selected as a reference waveform, and the waveform signal and the other physical quantity are selected based on a specific waveform point of the reference waveform. Based on obtaining the operating specifications of each of the electric parts based on the above, and analyzing the operating specifications to diagnose the electric device, the analysis of these operating specifications, The operating characteristics of the entire control rod driving device can be grasped more easily and accurately, and the diagnostic accuracy and reliability are improved accordingly.

It is a whole system figure in a 1st embodiment of the diagnostic method of the electric equipment concerning the invention in this application. It is explanatory drawing of the magnetic signal measuring method using a magnetic field sensor. It is a display screen of the waveform signal in control rod extraction operation and insertion operation of a control rod drive device. It is the analysis data of the waveform signal in control rod extraction operation and insertion operation of a control rod drive device. It is a whole system figure in a 2nd embodiment which applied the diagnostic method concerning the invention in this application to the diagnosis of a control rod drive device. It is a wave form diagram which shows the example of a waveform in a continuous stepping test. It is explanatory drawing of the taking-in method of the ACC signal in a continuous stepping test.

  Hereinafter, the present invention will be specifically described based on preferred embodiments.

I: First Embodiment FIG. 1 shows a system configuration when the diagnosis method according to the present invention is applied to diagnosis of a control rod drive device as an electric device. In FIG. It is the control rod drive device with which it is equipped. The control rod driving device 50 has a well-known structure. In the housing 55, a drive shaft 56 that is driven up and down, and a first electromagnetic coil 51 that drives the drive shaft 56 in the axial direction by a magnetic driving force. (Hereinafter, referred to as “LIFT coil 51”), a second electromagnetic coil 52 for moving gripper that lifts and lowers the drive shaft 56 (hereinafter, referred to as “MG coil 52”), and the drive shaft 56 are fixed. A third electromagnetic coil 53 (hereinafter referred to as “SG coil 53”) for a fixed gripper gripped at a position is accommodated, and the LIFT coil 51, the MG coil 52, and the SG coil 53 are each once at a predetermined timing. By operating, the drive shaft 56 is raised or lowered by one step.

  By repeating this one-step operation many times, the control rod connected to the lower end side of the drive shaft 56 can be pulled out from the core or inserted into the core. The LIFT coil 51, the MG coil 52, and the SG coil 53 correspond to “electric parts” in the claims.

  The control rod pull-out operation or insertion operation is performed by sequentially energizing or demagnetizing each of the coils 51 to 53 at a predetermined timing in response to energization from the power line 2. In this case, the currents supplied to the coils 51 to 53 are LIFT signals (abbreviated as “LIFT” in FIG. 1), MG signals (abbreviated as “MG” in FIG. 1), and SG signals (see FIG. 1). 1 is abbreviated as “SG”) and is input to the diagnostic device 41 side described later.

  Here, a method for acquiring the LIFT signal, the MG signal, and the SG signal will be described. As shown in FIG. 1, the coils 51 to 53 are energized through the power line 2 from the control panel 29. In this case, each power line 2 is accommodated in dedicated conduits 1A to 1C. Focusing on such a wiring structure, in this embodiment, a current value (amount of electricity) flowing through the power line 2 is acquired using a magnetic field sensor arranged outside the conduits 1A to 1C.

  Here, first, a method for acquiring the amount of electricity input to each of the coils 51 to 53 will be described, and then a method for diagnosing the control rod drive device using the amount of electricity will be described.

A: Electric quantity acquisition method In this embodiment, the electric quantity (particularly current in this embodiment) input to each of the coils 51 to 53 is acquired based on a magnetic signal detected by a magnetic field sensor, and By acquiring the correlation between the magnetic signal and the electric signal as a database, the acquisition of the electric signal from the next time onward is facilitated and speeded up.

  That is, as shown in FIG. 1, three magnetic field sensors 8A, 8B, and 8C are arranged on the outer peripheral surface of a portion where the geometric relative position with respect to the power line 2 in each of the conduits 1A to 1C does not change. A magnetic signal generated by energizing the power line 2 is acquired by the magnetic field sensors 8A, 8B, 8C. And the detection signal (magnetic signal) of each said magnetic field sensor 8A, 8B, 8C with which each of each conduit tube 1A-1C was equipped is input into the magnetic signal calculating means 31, respectively.

  Here, a method for acquiring a magnetic signal generated by energizing the power line 2 by the magnetic field sensors 8A, 8B, and 8C will be described with reference to FIG.

  In FIG. 2, a power line 2 is accommodated in the conduit 1. The power line 2 is a three-phase cable and has three electric wires U, V, and W. As described above, the geometric relative position of the power line 2 in the conduit 1 does not change. It is supposed to be. The magnetic field sensors 8A, 8B, and 8C are arranged on the outer circumference of the conduit 1 with a phase of 120 degrees in the circumferential direction. The power line 2 illustrated in FIG. 2 is a three-phase cable, but acquisition of magnetic signals is the same for the power line 2 of a two-phase cable as shown in FIG.

  Each of the magnetic field sensors 8A, 8B, and 8C has a characteristic of sensing a magnetic field line generated from each of the electric wires U, V, and W and outputting a signal corresponding to the magnitude of the magnetic field. It is known that the magnitude of the magnetic field is inversely proportional to the distance from the center of each electric wire U, V, W to each magnetic field sensor 8A, 8B, 8C. Accordingly, since the distances from the electric wires U, V, and W are different in the magnetic field sensors 8A, 8B, and 8C, the signals detected from the magnetic lines of force from the electric wires U, V, and W are different. For example, in the magnetic field sensor 8A, the signal sensed from the electric wires U and W having the small distances Aru and Arw is large, but the signal sensed from the electric wire V having the large distance Arv is small.

  Therefore, for example, when one magnetic field sensor is arranged in the conduit 1 and a magnetic signal is detected by the magnetic field sensor, the arrangement position of the power line 2 in the conduit 1, Depending on the position of the magnetic field sensor with respect to the conduit 1, the signal sensed from the power line 2 may be small, and a highly accurate magnetic signal may not be acquired.

  On the other hand, even if the position of the power line 2 in the conduit 1 is unknown, if a plurality of magnetic field sensors are disposed in the conduit 1, there are large and small signals detected from the lines of magnetic force. Therefore, for example, the output of a magnetic field sensor with a large sensed signal is adopted as a magnetic signal, or the sum of the output of a magnetic field sensor with a large sensed signal and the output of a magnetic field sensor with a small sensed signal is calculated. It is conceivable to adopt this as a magnetic signal. Specifically, the detection signals of the magnetic field sensors 8A, 8B, and 8C are obtained as large signal values that are easily discriminated by adding or subtracting them with absolute values, and this is obtained as a magnetism corresponding to the magnetic field of the power line 2. It is used as a signal.

  The signal values detected by the magnetic field sensors 8A, 8B, and 8C are taken into the magnetic signal calculation means 31, respectively, and are processed by the magnetic signal calculation means 31, and used as various kinds of processing or diagnosis described later as magnetic signals. .

  Returning to FIG. 1, the magnetic signal calculation means 31 obtains reference magnetic signals detected by the magnetic field sensors 8A, 8B, and 8C when a reference current is supplied to the power lines 2 in advance. The correlation between the current and the reference magnetic signal is held as a database for each of the conduits 1A to 1C. Accordingly, when the magnetic signal is input from the magnetic field sensors 8A, 8B, 8C attached to the conduits 1A to 1C, the magnetic signal calculation means 31 generates a current corresponding to the measured magnetic signal as described above. The current read from each database is output to the diagnostic device 41 as a LIFT signal, MG signal, and SG signal, respectively. The magnetic signals detected by each of the magnetic field sensors 8A, 8B, and 8C are added to the magnetic signal calculation means 31, for example, after adding them.

  Therefore, by adopting such a current acquisition method, it is possible to acquire current safely and easily without opening the electric control panel 29 even when the nuclear power facility is in operation.

  On the other hand, the control rod driving device 50 is provided with a vibration sensor (accelerometer) 54. The vibration sensor 54 detects an operation sound generated along with the operation of the control rod driving device 50, and this is referred to as a vibration signal (acceleration signal) (hereinafter referred to as “ACC signal”. In FIG. 1, it is abbreviated as “ACC”. Is output to a diagnostic device 41 described later.

  Next, the configuration and the like of the diagnostic device 41 will be described.

  As described above, the control rod driving device 50 is operated by the magnetic driving force of each of the coils 51 to 53, and the accuracy or reliability of the operation is determined by the coils 51 to 53. It is an essential requirement that the operation state such as the operation timing or operation time of 53 is properly maintained. Therefore, in order to ensure the accuracy of the operation of the control rod drive device 50 or the operational reliability, it is necessary to periodically diagnose the operating state of each of the coils 51 to 53. It is the diagnostic device 41 that is made available.

  The diagnostic device 41 has two types of diagnoses, that is, a “stepping test” for simply and quickly diagnosing the suitability of the operation timing of each of the coils 51 to 53 in each step of the control rod drive device 50; Furthermore, "detailed analysis" for analyzing the operation specifications of the ACC signal and each electrical signal, that is, the LIFT signal, the MG signal, and the SG signal can be performed simultaneously in parallel, as shown in FIG. As described above, the first diagnostic unit 42 for performing the “stepping test” and the second diagnostic unit 43 for performing the “detailed analysis” are provided.

  The “stepping test” includes “individual stepping test” for confirming the operation state of each step of the control rod driving device 50 and “continuous stepping test” for confirming the operation state through all steps.

  The first diagnosis unit 42 includes a first calculation unit 44, a second calculation unit 45, a display unit 46, and a first output unit 47, which will be described later. On the other hand, the second diagnosis unit 43 includes a third calculation unit 48 and a second output unit 49 described later in addition to the first calculation unit 44 and the second calculation unit 45. In any of these diagnosis units 42 and 43, the electrical signals from the magnetic signal calculation means 31, that is, the LIFT signal, the MG signal, the SG signal, and the ACC signal are used as waveform signals. Yes.

  The first calculation unit 44 records the LIFT signal, the MG signal, and the SG signal output from the magnetic signal calculation unit 31 as waveform signals, and also records the ACC signal from the vibration sensor 54 as a waveform signal. These are output to the second calculation unit 45 described below. In this embodiment, for convenience of explanation, the case where the control rod driving device 50 is single, that is, the case where the LIFT signal, the MG signal, and the SG signal as electrical signals are one each is illustrated. In practice, however, as will be described later, for example, four control rod driving devices 50 are set as one set (that is, four lots are set as one set), and each of these four control rod driving devices 50 is input. The four LIFT signals, the MG signal, and the SG signal are simultaneously recorded, and the waveform signals for these four lots are simultaneously output to the second arithmetic unit 45 together with the ACC signal (see FIG. 5).

  Here, in the continuous stepping test, a method in which the ACC signal from the vibration sensor 54 is taken into the first calculation unit 44 will be described with reference to FIG.

  The ACC signal from the vibration sensor 54 is an AC signal having a high frequency (mainly 2 to 5 kHz). When the average value is calculated or compared for each step of the waveform of the ACC signal, as shown in FIG. 3A, the shape of the amplitude change of the AC waveform is handled instead of the AC waveform itself.

  Here, in order to obtain the shape of the change in amplitude of the AC waveform, a general method is to rectify the AC waveform full-wave and obtain the resulting envelope. At this time, it is necessary to measure the original alternating current waveform in detail as much as possible, but in order to measure the alternating current of 2 to 5 kHz, it is necessary to sample at a high frequency (short cycle) of 10 kHz or more. However, since the continuous stepping test continuously samples for a long time, the amount of data becomes enormous at a high sampling frequency, which is inconvenient for later arithmetic processing (note that other LIFT signals, MG signals, SGs). For signals, a sampling frequency of 1 kHz is sufficient.)

  Therefore, in this embodiment, the following method is adopted. That is, as shown in FIG. 3B, an envelope processor 60 is installed in the previous stage for sampling the ACC signal. In the envelope processor 60, the ACC signal input from the vibration sensor 54 is full-wave rectified in the analog full-wave rectifier circuit 61, and further smoothed in the smoothing circuit 62. 44. In this case, since the output from the envelope processor 60 has a relatively low frequency, it can be sufficiently measured at a sampling frequency of 1 kHz, like other LIFT signals, MG signals, and SG signals.

  In the individual stepping test, the second arithmetic unit 45 sequentially outputs the LIFT signal, the MG signal, and the SG signal for four lots input from the first arithmetic unit 44 for each lot together with the ACC signal. The data is output to the display unit 46 on the diagnosis unit 42 side and the third calculation unit 48 on the second diagnosis unit 43 side. In the continuous stepping test, the LIFT signal, the MG signal, and the SG signal for four lots input from the first calculation unit 44 through all the steps are sequentially stored together with the ACC signal for the first diagnosis unit 42. Output to the display unit 46 on the side and the third calculation unit 48 on the second diagnosis unit 43 side.

  In the individual stepping test, the display unit 46 sequentially displays each waveform signal for each lot input from the second calculation unit 45 on the monitor (see FIG. 3), and visually checks the displayed waveform signal. Diagnosis is possible by doing.

  Moreover, in the continuous stepping test, each waveform signal for each lot input from the second calculation unit 45 is continuously displayed on the monitor (see FIG. 6), and the waveform signal displayed here is visually observed. Alternatively, diagnosis by automatic evaluation is possible.

  FIG. 6 shows the waveform display in the continuous stepping test. Here, an evaluation method in the continuous stepping test will be described. In this example, if the LIFT signal repeatedly displayed for each step is in an appropriate state, the waveform is the same throughout all the steps. However, in the intermediate step, the waveform differs from the other steps as indicated by the part a. The waveform is displayed. Thus, when the same waveform should be repeated originally, a different waveform appears, so that it can be visually confirmed that a failure or malfunction has occurred on the LIFT coil 51 side.

  On the other hand, when such an evaluation is automatically performed on the software, first, each waveform signal repeatedly displayed in each step and an average value of the waveform signals in all repetition periods (all steps) of the respective waveform signals are calculated. When there is a waveform signal whose deviation exceeds a predetermined threshold, the operation in the step to which the waveform signal exceeding this threshold belongs is evaluated as “careful” or “abnormal” It is. In the case of the example shown in FIG. 6, the operation in the step to which the part a belongs is evaluated as requiring attention or abnormal. According to this evaluation method, highly reliable and highly accurate evaluation can be obtained more quickly.

  The evaluation is a continuous stepping test for a waveform signal based on a specific electrical signal, for example, the LIFT signal. In addition to the continuous stepping test using such a technique, for example, a plurality of electrical signals The present invention can also be applied to a waveform signal based thereon, for example, between the above-mentioned LIFT signal, MG signal and SG signal, or between two appropriately selected. For example, among all the steps, the waveform signal based on the LIFT signal and the MG signal is normal at a certain step, but the waveform signal based on the SG signal is abnormal, and is “abnormal” when viewed as the entire step. It is to evaluate.

  Furthermore, in both the individual and continuous stepping tests, the waveform signal displayed on the display unit 46 can be printed out at the first output unit 47 and checked or stored on the paper as necessary. .

  On the other hand, in the third calculation unit 48 on the second diagnosis unit 43 side, the LIFT signal, the MG signal, and the SG signal related to the current output from the second calculation unit 45 for each lot, and the ACC signal related to the operating sound. In response, each of the waveform signals is displayed on the monitor one lot at a time, and one of these LIFT signal, MG signal and SG signal, for example, the operation of the ACC signal and each electrical signal based on the LIFT signal. The specifications are analyzed in detail, and the analysis results are converted into data and displayed (see FIGS. 3 and 4).

  Further, if necessary, the display contents and analysis results in the third calculation unit 48 are printed out in the second output unit 49 so that they can be confirmed or stored on paper.

  Here, the specific contents of the diagnosis in the diagnostic device 41 will be described with reference to FIGS. 3 and 4 taking an individual stepping test as an example.

  FIG. 3A shows the LIFT signal, the MG signal, the SG signal, and the ACC signal in one step when the control rod driving device 50 pulls out the control rod. FIG. 3B shows the LIFT signal, the MG signal, the SG signal, and the ACC signal in one step when the control rod driving device 50 performs the control rod insertion operation.

  In the display on the display unit 46 of the first diagnosis unit 42, only the waveform signals in FIGS. 3 (a) and 3 (b) are displayed. In the stepping test in the first diagnosis unit 42, the temporal generation timing among the LIFT signal, the MG signal, the SG signal, and the ACC signal, that is, the LIFT coil 51, the MG coil 52, and the SG This is because it is sufficient that the operation sequence (ON-OFF) of the coil 53 can be confirmed by visual observation, and it is sufficient to display only the waveform signal.

  On the other hand, in the 3rd calculating part 48 of the said 2nd diagnostic part 43, it analyzes with the waveform display of a LIFT signal, MG signal, SG signal, and ACC signal like FIG. The result of the processing is added, and further data display as shown in FIGS. 4 (a) and 4 (b) is performed.

  Here, the specifications to be analyzed in the analysis process are defined for each of the LIFT coil 51, the MG coil 52, and the SG coil 53, as shown in FIGS.

  Regarding the operation of the LIFT coil 51, it is a time to pull out the drive shaft 56 with the movable gripper in the pull-out operation, and the movable gripper is lifted up without holding the drive shaft 56 in the insertion operation. The time “TLin”, which is the time, is the time for the movable gripper to return to the initial position after the pulling operation is completed in the pulling operation. In the inserting operation, the movable gripper is inserted in a state where the drive shaft 56 is grasped. “TLout” which is time is defined,

  Regarding the operation of the MG coil 52, the time “TMin” from the start of excitation of the MG coil 52 to the completion of the grip operation on the drive shaft 56 and the release of the grip on the drive shaft 56 from the start of demagnetization of the MG coil 52. Time “TMout” is defined until

  Regarding the operation of the SG coil 53, the time “TSout” from the start of degaussing of the SG coil 53 until the grip opening to the drive shaft 56 is completed, and the grip operation on the drive shaft 56 from the start of excitation of the SG coil 53. A time “TSin” until the completion of the process is defined.

In addition, regarding the operation between the three of these LIFT coil 51, MG coil 52 and SG coil 53,
The time “dTMS” from the arrival time of “TMin” to the start time of “TSout”,
The time “dTSM” from the arrival time of “TSin” to the start time of “TMout”;
This is the time “dTLM” from the arrival time of “TMout” to the arrival time of “TLout”.

  Regarding the arrival time of “TMin”, the arrival time of “TSout”, the arrival time of “TLin”, the arrival time of “TSin”, the arrival time of “TMout”, and the arrival time of “TLout” All are determined at the rising edge of the ACC signal.

  By the way, when analyzing such specifications and diagnosing their suitability, data from the control rod drive device 50 side is collected. Usually, the control rod drive device 50 is operated continuously for several steps. In addition, since all of the data in the continuous operation period is continuously collected, it is necessary to separate data for several consecutive steps for each step as preparation for analysis. In addition, in order to perform the separation for each step, it is necessary to set the collection start time for each step.

  In such a case, it is known to use a control signal for the entire control system as one method, but this control signal is a very important signal from the viewpoint of ensuring the reliability of the control, etc. Alternatively, it is advantageous if the above steps can be separated without using this control signal in order to simplify the measurement circuit and improve reliability and cost reduction.

  Therefore, in this embodiment, any one of the LIFT signal, the MG signal, and the SG signal is used as a reference signal for separation. In this case, as shown in FIG. 3, paying attention to the fact that when these LIFT signals are compared with MG signals and SG signals, the rising shape of the LIFT signal is clear and extremely easy to determine compared to other signals. The LIFT signal is used as a reference signal.

  Specifically, as shown in FIG. 3, a time point that is back by time “ts” from the excitation start time of the LIFT coil 51 in the LIFT signal (starting point of “TLin”) is set as the reference position for separation. A range from this reference position to a position where the state of each signal at the reference position is repeated again is defined as a one-step signal separation range. In this embodiment, the excitation start time of the LIFT coil 51 corresponds to a “specific waveform point” in the claims. It is also conceivable that the reference position for separation is obtained from the control circuit (for example, the point in time after a certain period of time has elapsed since the operator turned on the operation lever).

  In this way, the signals of each step are collected sequentially, and this is analyzed by calculation in the third calculation unit 48. The analysis result is displayed as a waveform signal with a numerical value as shown in FIG. 3 and as analysis data of several steps as shown in FIG.

  Accordingly, the tester visually confirms the displayed waveform signals and data to confirm each specification described herein and its quality, thereby easily and accurately making a diagnosis of the control rod driving device 50. It is something that can be done.

II: Second Embodiment FIG. 5 includes a plurality of control rod drive devices 50A to 50D, and collects data for each of the plurality of control rod drive devices 50A to 50D as a set. Further, it is shown that various specifications based on the data are analyzed to diagnose each of the control rod drive devices 50A to 50D.

  In this example, twelve power lines 2 connected to each of the three coils 51, 52, 53 of the four control rod driving devices 50, that is, the LIFTs of the control rod driving devices 50, respectively. Power lines 2A1, 2B1, 2C1, 2D1 connected to the coil 51, power lines 2A2, 2B2, 2C2, 2D2 connected to the MG coils 52, and power lines 2A3, 2B3 connected to the SG coil 53, respectively. 2C3 and 2D3 are divided into four power lines connected to the same coil, and are grouped together and accommodated in conduits 1A to 1C, respectively.

  Magnetic field sensors 8A, 8B, 8C, etc. are attached to the respective conduits 1A-1C in which these four power lines of the same type are accommodated, and magnetic signals detected by the magnetic field sensors 8A, 8B, 8C, etc. Based on the above, currents supplied to the coils 51 to 53 of the control rod drive devices 50A to 50D are acquired and input to the diagnosis device 41 to diagnose the control rod drive devices 50A to 50D. To do.

  In addition, since the diagnostic method and the like in the diagnostic device 41 are the same as those in the first embodiment, the corresponding description of the first embodiment is used, and the description thereof is omitted here.

  By the way, as mentioned above, in the state where the power lines 2A1 to 2D1, 2A2 to 2D2, and 2A3 to 2D3 connected to the same coil of the control rod driving devices 50A to 50D are accommodated in the respective conduits 1A to 1C, When an electromagnetic signal is detected by the magnetic field sensors 8A, 8B, 8C, etc., it is difficult to accurately determine which signal is from which control rod driving device, but in this embodiment, the following method is used. This is solved by adopting.

  That is, the conduit 1C will be described. As shown in an enlarged view in FIG. 5, a plurality (six in this embodiment) of magnetic field sensors 8A to 8F are attached to the outer periphery of the conduit 1C at a predetermined interval. In this state, a reference current is supplied to each of the control rod drive devices 50A to 50D with a required time difference, and magnetic signals are detected by the magnetic field sensors 8A to 8F provided in the conduit 1C. In this case, the magnetic signals generated from the power lines 2A3 to 2D3 are detected in the magnetic field sensors 8A to 8F, respectively. When a plurality of magnetic signals generated from the power line 2 having different distances from the magnetic field sensor are detected by the same magnetic field sensor, the signal level (voltage value) detected as the magnetic signal generated from the power line 2 having a shorter distance is detected. ) Is high.

  Therefore, when a reference current is supplied to the SG coil 53 of one control rod driving device 50, the magnetic field sensor that detects the highest level signal among the magnetic field sensors 8A to 8F is selected. Thus, it is specified that the magnetic signal detected by the magnetic field sensor 8 is the magnetic signal having the greatest influence from the SG coil 53 of the one control rod driving device 50. In this way, the combination of the SG coil 53 of each of the control rod driving devices 50A to 50D and the magnetic field sensor 8 that detects the magnetic signal from the SG coil 53 is used for all the control rod driving devices 50A to 50D. Identify and store this in a database.

  Further, the combination of the control rod driving devices 50A to 50D and the corresponding magnetic field sensor 8 is specified, and at the same time, the correspondence between the reference current and the magnetic signal based on the reference current is obtained and stored as a data database.

  If these two databases are held, the current supplied to the coils 51 to 53 of the plurality of control rod drive devices 50A to 50D can be acquired easily and with high accuracy only by the magnetic field sensor 8 from the next time. It is something that can be done. By using this electrical signal, the diagnosis of the four control rod drive devices 50A to 50D can be performed simultaneously in the diagnosis device 41, and the efficiency of the diagnosis work is promoted.

DESCRIPTION OF SYMBOLS 1 .... Conduit 1A-1C ... Conduit 2 ... Power line 8 ... Magnetic field sensor 29 ... Control panel 31 ... Magnetic signal calculation means 41 ... Diagnosis device 42 ... First diagnosis part 43 ... Second Diagnosis unit 44 .. First calculation unit 45 .. Second calculation unit 46 .. Display unit 47 .. First output unit 48 .. Third calculation unit 49 .. Second output unit 50 .. Control rod drive device 51 ..First electromagnetic coil (LIFT coil)
..Second electromagnetic coil (MG coil)
..Third electromagnetic coil (SG coil)
54 ・ ・ Vibration sensors (accelerometers)
60 ..Envelope processor 61 ..Full wave rectifier circuit
62 ..Smoothing circuits U, V, W

Claims (4)

A magnetic signal generated from each power line is acquired by a plurality of magnetic field sensors arranged in a portion where a geometric relative position to the power line does not change in a conduit containing a power line energizing each of a plurality of electric devices. In the diagnostic method of the electric device using the electric signal corresponding to the magnetic signal for diagnosis of the electric device,
The operation of specifying the magnetic field sensor that has detected the highest level signal when a reference current is supplied to one of the plurality of power lines as the magnetic field sensor corresponding to the one power line is performed for each of the plurality of power lines. Thus, a correspondence relation between the plurality of power lines and the plurality of magnetic field sensors is specified, and the correspondence relation is held as a database and used for diagnosis of the electric equipment. In claim 1,
When diagnosing an electric device based on a correlation between an electric signal corresponding to the amount of electricity input to the electric device and another physical quantity obtained in the electric device, the magnetic signal is used as a reference magnetic signal, and the reference magnetic signal With reference to the correlation database of the reference electric signal corresponding to the signal, the electric signal corresponding to the magnetic signal acquired by the measurement is acquired, and the electric signal and the other physical quantity are displayed as waveform signals, respectively. Diagnosis method for an electric device characterized in that diagnosis is performed based on appropriateness of generation timing between waveform signals or deviation between each waveform signal displayed repeatedly and an average value of all the waveform signals in all repetition periods . In claim 1,
The electric device is composed of a plurality of electric parts, acquires an electric signal corresponding to the amount of electricity input to the electric part for each power line corresponding to each electric part, and obtains the electric signal on the electric equipment side. When diagnosing an electric device based on a correlation with other physical quantities, an electrical signal corresponding to a magnetic signal obtained by measurement is obtained by referring to a correlation database of reference electrical signals corresponding to the reference magnetic signal In addition, the electrical signals and the other physical quantities are respectively displayed as waveform signals, and whether or not the generation timing between the waveform signals is appropriate for each motorized part or each waveform signal displayed repeatedly A diagnosis method for an electric device, characterized in that a diagnosis is performed based on a deviation from an average value in all repetition periods of a waveform signal. In claim 3,
Any one of the waveform signals based on each of the electrical signals is selected as a reference waveform, and the specific waveform point of the reference waveform is used as a reference based on the waveform signals and the other physical quantities. A diagnostic method for an electric device characterized in that an operation specification of each electric unit is acquired and a diagnosis is performed by analyzing the operation specification.

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