JP6595355B2 - Magnetic core member deterioration diagnosis device, magnetic core member deterioration diagnosis method - Google Patents

Description

  Embodiments described herein relate generally to a deterioration diagnosis technique for a magnetic core member.

  In order to diagnose deterioration of the iron core of the transformer, there is a device that detects a partial discharge current output from the transformer by attaching a clamp-type high-frequency CT to the ground line of the transformer. In this apparatus, the deterioration state of the transformer is diagnosed based on the partial discharge current signal detected by the high frequency CT and the data of the partial discharge characteristics stored in advance (see, for example, Patent Document 1).

JP 11-326429 A

  However, since the partial discharge current output from the transformer is a weak current, the S / N ratio is poor and the influence of noise increases. Therefore, the partial discharge current is passively detected to detect the iron core (magnetic core member). When the deterioration state (deterioration degree) is diagnosed, the detection value of the partial discharge current cannot be obtained accurately when noise occurs, and the deterioration state of the iron core is erroneously diagnosed.

  Embodiments of the present invention have been made in view of such circumstances, and an object of the present invention is to provide a deterioration diagnosis technique for a magnetic core member that can accurately diagnose the deterioration degree of a magnetic core member that has been used over time. .

The deterioration diagnosis device for a magnetic core member according to an embodiment of the present invention is a clamp type that can be attached to a coil when the wound coil portion wound around the magnetic core member is an electrically closed loop coil. Current transformer unit, an oscillation unit that is provided in the same circuit as the current transformer unit and applies a specific AC voltage to the current transformer unit at a specific frequency, the current transformer unit, the winding coil unit, and the Based on detection information corresponding to the magnetic core member in the initial state, and an acquisition unit for acquiring detection information based on at least the current flowing in the current transformer unit when an electromagnetic induction phenomenon acting between the magnetic core members occurs Determination information is set, a storage unit that stores the determination information, detection information corresponding to the magnetic core member that has been used for a while from the initial state, and the determination information Zui it, characterized in that it comprises a diagnosis unit for diagnosing the deterioration degree, the.

In the deterioration diagnosis method for a magnetic core member according to an embodiment of the present invention, when a wound coil portion wound around the magnetic core member is an electrically closed loop coil, a clamp-type current transformer is connected to the coil. An attaching step for attaching the current transformer unit , an oscillation step for applying a specific AC voltage to the current transformer unit at a specific frequency by an oscillation unit provided in the same circuit as the current transformer unit, the current transformer unit, the winding An acquisition step of acquiring detection information based on at least a current flowing in the current transformer unit when an electromagnetic induction phenomenon acting between the coil unit and the magnetic core member occurs, and corresponding to the magnetic core member in an initial state Determination information is set based on the detection information, a storage step for storing the determination information, and a magnetic field that has been used over time from the initial state. Based the detection information corresponding to the member and the determination information, characterized in that it comprises a diagnostic step of diagnosing the deterioration degree, the.

  The embodiment of the present invention provides a deterioration diagnosis technique for a magnetic core member that can accurately diagnose the deterioration degree of a magnetic core member that has been used over time.

The figure which shows the deterioration diagnostic apparatus of this embodiment. The circuit diagram which shows the structure of a deterioration diagnostic apparatus. The block diagram which shows the personal computer which comprises a deterioration diagnostic apparatus. The flowchart which shows the procedure of deterioration diagnosis.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, the deterioration diagnosis device of the present embodiment is a device for diagnosing the deterioration degree of the magnetic core member 2 included in the transformer 1 (transformer). The magnetic core member 2 is formed as a member having a quadrangular shape (annular shape). The magnetic core member 2 is a metal member made of a soft magnetic material. On the left side of the magnetic core member 2 in the figure, a first winding coil portion 3 is wound as a primary coil to which AC power of a predetermined voltage is supplied from an external power source. In the present embodiment, AC power having a predetermined frequency (for example, 50 to 60 Hz) is input to the first winding coil unit 3. Further, on the right side of the magnetic core member 2 in the drawing, a second winding coil portion 4 as a secondary coil that changes and outputs a voltage supplied to the first winding coil portion 3 is wound. The transformer 1 is an electrical device having a function of changing a voltage according to a winding ratio between the first winding coil unit 3 and the second winding coil unit 4.

  The transformer 1 can be connected to the ground line 15 when performing maintenance or the like. For example, at the time of maintenance of the transformer 1, the switch 14 (breaker) between the two wires 16 of the first winding coil unit 3 and the two power supply lines 17 extending from the power source is turned off. Further, the switch 13 (breaker) between the two wires 16 of the first winding coil unit 3 and the two ground wires 15 is turned ON. By connecting the grounding wire 15 to the first winding coil unit 3, the first winding coil unit 3 becomes a loop-like coil (short-circuiting loop coil) that is electrically closed through grounding ( (See FIG. 2). It should be noted that being electrically closed indicates that there is no current flowing in and out of other parts in the electric circuit.

  The magnetic core member 2 of the transformer 1 forms a magnetic flux path (magnetic path), and is made of a high permeability material in order to increase inductance. The magnetic core member 2 is formed by laminating a plurality of thin iron members, and each layer is insulated to suppress eddy currents. The magnetic core member 2 may be deteriorated by long-term use. For example, insulation between laminated iron members may deteriorate. Then, the eddy current loss (iron loss) of the magnetic core member 2 increases, and the temperature of the magnetic core member 2 rises more than usual.

  Therefore, in this embodiment, a deterioration diagnosis device (deterioration diagnosis system) for diagnosing deterioration of the magnetic core member 2 used over time is provided. This degradation diagnosis apparatus includes a clamp-type current transformer unit 10 (clamp CT), a personal computer 11 (PC) that diagnoses degradation by performing various processes, and a measurement in which the current transformer unit 10 is connected via a cable. Device 12. Further, the current transformer unit 10 clamps (pinches) the ground wire 15 connected to the first winding coil unit 3.

  In general, the clamp CT has an annular magnetic core 28 around which the sensor coil 27 is wound (see FIG. 2), and an instrument for measuring the current flowing through the electric wire inserted into the magnetic core 28. It is. The magnetic core 28 is a member that can be opened and closed divided in half. When the magnetic core 28 clamps the electric wire to be measured, the current can be measured without breaking the electric wire. In the present embodiment, this clamp CT is used as the current transformer unit 10.

  As shown in FIG. 2, the measuring device 12 has an electric circuit connected to the current transformer unit 10. The sensor coil 27 of the current transformer unit 10 is wound around the magnetic core 28. This magnetic core 28 is attached to the ground wire 15 connected to the first winding coil portion 3. Further, the first winding coil portion 3 surrounds a part of the magnetic core member 2. The electric circuit also includes an oscillating unit 23 that outputs AC power having a high frequency (specific frequency) of 1 kHz or more with a predetermined (constant) voltage amplitude to the current transformer unit 10.

  Further, the measuring device 12 is provided with a voltmeter 24 that measures the voltage value of the current transformer unit 10 and an ammeter 25 that measures the current value of the electric circuit. A resonance capacitor 26 is provided in series between the oscillation unit 23 and the sensor coil 27 of the current transformer unit 10. The oscillation circuit 23, the sensor coil 27 of the current transformer 10 and the capacitor 26 constitute a resonance circuit.

  In the present embodiment, when a current is output from the oscillating unit 23, an electromagnetic induction phenomenon that acts between the sensor coil 27 and the magnetic core 28 of the current transformer unit 10 occurs. An electromagnetic induction phenomenon occurs in the first winding coil portion 3 due to the electromagnetic induction phenomenon of the magnetic core 28, and further, an electromagnetic induction phenomenon occurs in the magnetic core member 2 via the first winding coil portion 3. At this time, by measuring the voltage value of the voltmeter 24 and the current value of the ammeter 25, the measured value (detection information) of the current transformer unit 10 (sensor coil 27) can be acquired. The measured value may be a reactance value or a resistance value of the current transformer unit 10. Further, a value obtained by changing the frequency or phase of the current flowing through the current transformer unit 10 may be used as the measurement value. Then, by analyzing the acquired measurement value with the personal computer 11, a loss characteristic value corresponding to a value that changes in proportion to the eddy current loss (iron loss) of the magnetic core member 2 can be obtained.

  In the present embodiment, the simplified example is shown in which the elements of the electric circuit are minimized, but an electric circuit including other elements may be used. Further, when the current transformer unit 10 described above is removed from the ground wire 15, the current transformer unit 10 and the measuring device 12 can be carried. In this way, the current transformer unit 10 and the measuring device 12 can be handheld. In addition, the measuring device 12 may be provided with a grip portion used when the user carries it.

  Furthermore, the measuring device 12 includes a control unit 20 that controls the electric circuit, a communication unit 21 that communicates with the personal computer 11 using a cable, and an analysis unit 22 that analyzes various information acquired from the electric circuit. . Note that the communication unit 21 and the analysis unit 22 are connected to and controlled by the control unit 20, respectively.

  The control unit 20 controls the output current value, voltage value, frequency value, and the like of the oscillation unit 23. Further, the voltage value of the voltmeter 24 and the current value of the ammeter 25 are input to the control unit 20. The analysis unit 22 includes an analyzer for performing analysis such as FFT (Fast Fourier Transform).

  For example, the control unit 20 causes the analysis unit 22 to perform analysis, so that the frequency of the current flowing through the current transformer unit 10 (sensor coil 27) based on the voltage value of the voltmeter 24 and the current value of the ammeter 25 is determined. And information about the phase. The control unit 20 has an automatic tuning function that maximizes the resonance state caused by the current transformer unit 10 and the capacitor 26.

  Various control contents of the control unit 20 of the measuring device 12 are instructed by the personal computer 11 connected via the communication unit 21. In addition, the measurement value (information) acquired by the control unit 20 of the measurement device 12 is transmitted to the personal computer 11 via the communication unit 21.

  As shown in FIG. 3, the personal computer 11 according to the present embodiment is a computer that has hardware resources such as a CPU 30, a ROM 31, a RAM 32, and an HDD 33 and executes various programs to perform various controls. Further, the personal computer 11 includes an output device 34 that can output various information such as a display, an input device 35 that can input various information such as a keyboard, a communication unit 36 that communicates with the measuring device 12 using a cable, and the like. Have.

  In addition, the CPU 30 is provided with an acquisition unit 40 that acquires the measurement value of the current transformer unit 10 based on the information transmitted from the measurement device 12. Further, the CPU 30 is provided with a calculation unit 41 that calculates the loss characteristic value of the magnetic core member 2 based on the measurement value of the current transformer unit 10. Further, the CPU 30 is provided with a simulation unit 42 that simulates (estimates) the deteriorated magnetic core member 2, that is, the magnetic core member 2 with a known deterioration degree. Further, the CPU 30 is provided with a deterioration diagnosis unit 43 that performs deterioration diagnosis based on the loss characteristic value (detection information) of the magnetic core member 2 to be diagnosed and a predetermined determination value (determination information).

  The HDD 33 is a storage device that stores various types of information. The HDD 33 is provided with a determination information storage unit 44 that stores, as determination information, a determination value used when a deterioration diagnosis of the magnetic core member 2 is performed. Further, the HDD 33 is provided with a detection information storage unit 45 that stores detection information such as measurement values (information) transmitted from the measurement device 12.

  Next, a procedure for performing deterioration diagnosis of the magnetic core member 2 will be described with reference to FIG. 4 (refer to FIGS. 1 to 3 as appropriate). In the present embodiment, a determination value (threshold value) used for deterioration diagnosis is set before diagnosing the magnetic core member 2 that has been used for a long time, that is, the magnetic core member 2 to be subjected to deterioration diagnosis.

  First, the current transformer unit 10 is set in a state of being attached to the initial transformer 1. That is, the current transformer part 10 (clamp CT) is attached to the ground wire 15 connected to the first winding coil part 3 in a state surrounding the magnetic core member 2 in the initial state (S11: attachment step). In the present embodiment, the transformer 1 in the initial state is the transformer 1 in a state where the magnetic core member 2 is not deteriorated. For example, a new transformer 1 just installed at a predetermined place of use is used as the transformer 1 in the initial state. Note that the transformer 1 in a state immediately before being shipped from the manufacturing factory may be used. Moreover, even if it is the state near the new article even if it is the transformer 1 which started use, it will be set as an initial state.

  Then, the control unit 20 of the measuring device 12 outputs a high-frequency alternating current from the oscillation unit 23 at a predetermined voltage. At this time, high-frequency alternating current (current) flows through the current transformer unit 10 (S12: oscillation step).

  Furthermore, the acquisition unit 40 of the control unit 20 acquires the measurement value of the current transformer unit 10 (sensor coil 27) by analyzing the voltage value of the voltmeter 24 and the current value of the ammeter 25 (S13: acquisition). Step). At this time, when a current (power) output from the oscillating unit 23 flows to the current transformer unit 10, an electromagnetic induction phenomenon that acts between the current transformer unit 10 and the first winding coil unit 3 occurs. Furthermore, the electromagnetic induction phenomenon which acts between the 1st coil part 3 and the magnetic core member 2 arises. Therefore, the measured value of the current transformer unit 10 is affected by the eddy current loss (iron loss) of the magnetic core member 2. Specifically, the current transformer unit 10 is affected by a magnetic field generated from the magnetic core member 2 via the first winding coil unit 3.

  Further, the control unit 20 of the measuring device 12 transmits the measurement value of the current transformer unit 10 attached to the transformer 1 in the initial state to the personal computer 11. Then, the CPU 30 of the personal computer 11 stores the received measurement value as detection information in the detection information storage unit 45 of the HDD 33.

  And CPU30 of the personal computer 11 calculates the loss characteristic value of the magnetic core member 2 of an initial state based on each measured value memorize | stored in the detection information storage part 45 (S14: calculation step). Specifically, a value (difference) obtained by subtracting a measurement value of the current transformer unit 10 not attached to the transformer 1 from a measurement value of the current transformer unit 10 attached to the transformer 1 in the initial state is a magnetic core in the initial state. This is a value corresponding to the loss characteristic value of the member 2. The calculation of the loss characteristic value is executed by the calculation unit 41 of the CPU 30. Further, the CPU 30 of the personal computer 11 stores the calculated loss characteristic value of the magnetic core member 2 in the initial state in the detection information storage unit 45 of the HDD 33 as detection information.

  Next, the CPU 30 of the personal computer 11 simulates the loss characteristic value of the magnetic core member 2 that has deteriorated over time based on the loss characteristic value of the magnetic core member 2 in the initial state. (Estimate) (S15: Simulation step). This simulation is executed by the simulation unit 42 of the CPU 30. In addition, the CPU 30 of the personal computer 11 stores the loss characteristic value of the magnetic core member 2 whose calculated degree of deterioration is known in the detection information storage unit 45 of the HDD 33. By performing this simulation, the loss characteristic value of the deteriorated magnetic core member 2 can be acquired even if the magnetic core member 2 that has actually been used over time is not available.

  In the state where the magnetic core member 2 is deteriorated, the insulation between the laminated iron members is partially deteriorated, so that the eddy current loss of the magnetic core member 2 increases. Therefore, the loss characteristic value of the magnetic core member 2 after deterioration becomes larger than the loss characteristic value of the magnetic core member 2 in the initial state. The magnetic core member 2 to be simulated may be assumed to be used for 5 years from the initial state, may be assumed to be used for 10 years from the initial state, or is used for 20 years from the initial state. May be assumed. Further, since the loss characteristic value of the magnetic core member 2 increases as the period of use over time increases, the value obtained by increasing the loss characteristic value of the magnetic core member 2 in the initial state is used as the loss characteristic value of the deteriorated magnetic core member 2. good.

  Next, the CPU 30 sets a determination value (threshold value) used for deterioration diagnosis based on the simulated loss characteristic value of the magnetic core member 2 after deterioration, and stores it in the determination information storage unit 44 of the HDD 33 (S16: storage). Step).

  Note that this determination value may not always be a constant value. For example, the determination value may change according to the room temperature where the transformer 1 to be subjected to deterioration diagnosis is placed. Further, the determination value may be changed according to the current value, voltage value, or frequency value of the current output from the oscillation unit 23 of the measuring device 12.

  Next, deterioration diagnosis of the transformer 1 to be diagnosed for deterioration degree is performed. First, the current transformer unit 10 is mounted on the transformer 1 to be diagnosed. That is, the current transformer unit 10 (clamp CT) is attached to the ground wire 15 connected to the first winding coil portion 3 in a state surrounding the periphery of the magnetic core member 2 to be diagnosed (S17: attachment step).

  Then, the control unit 20 of the measuring device 12 outputs a high-frequency alternating current from the oscillation unit 23 at a predetermined voltage. At this time, high-frequency alternating current (current) flows through the current transformer unit 10 (S18: oscillation step).

  Furthermore, the acquisition unit 40 of the control unit 20 acquires the measurement value of the current transformer unit 10 (sensor coil 27) by analyzing the voltage value of the voltmeter 24 and the current value of the ammeter 25 (S19: acquisition). Step). At this time, when a current (power) output from the oscillating unit 23 flows to the current transformer unit 10, an electromagnetic induction phenomenon that acts between the current transformer unit 10 and the first winding coil unit 3 occurs. Furthermore, the electromagnetic induction phenomenon which acts between the 1st coil part 3 and the magnetic core member 2 arises. Therefore, the measured value of the current transformer unit 10 is affected by the eddy current loss (iron loss) of the magnetic core member 2. Specifically, the current transformer unit 10 is affected by a magnetic field generated from the magnetic core member 2. In addition, when the magnetic core member 2 to be diagnosed is deteriorated, there is a difference between the measured value of the current transformer unit 10 attached to the first winding coil unit 3 that winds the magnetic core member 2 in the initial state. It comes to occur.

  Further, the control unit 20 of the measuring device 12 transmits the measurement value of the current transformer unit 10 attached to the transformer 1 to be diagnosed to the personal computer 11. Then, the CPU 30 of the personal computer 11 stores the received measurement value as detection information in the detection information storage unit 45 of the HDD 33.

  Then, the CPU 30 of the personal computer 11 calculates the loss characteristic value of the magnetic core member 2 to be diagnosed based on each measurement value stored in the detection information storage unit 45 (S20: calculation step). Specifically, a value (difference) obtained by subtracting the measured value of the current transformer 10 not attached to the transformer 1 from the measured value of the current transformer 10 attached to the transformer 1 to be diagnosed is a magnetic core to be diagnosed. This is a value corresponding to the loss characteristic value of the member 2. The calculation of the loss characteristic value is executed by the calculation unit 41 of the CPU 30. Further, the CPU 30 of the personal computer 11 stores the calculated loss characteristic value of the magnetic core member 2 to be diagnosed in the detection information storage unit 45 of the HDD 33 as detection information.

  Next, the CPU 30 of the personal computer 11 performs a deterioration diagnosis based on the loss characteristic value of the magnetic core member 2 to be diagnosed and the determination value stored in the determination information storage unit 44 (S21: diagnosis step). Specifically, it is determined whether or not the loss characteristic value of the magnetic core member 2 to be diagnosed is greater than or equal to a determination value. When it is determined that the loss characteristic value is equal to or greater than the determination value, it is determined that the magnetic core member 2 to be diagnosed has deteriorated. Moreover, when it determines with it not being more than a determination value, it determines with the magnetic core member 2 to be diagnosed not deteriorating. Then, the CPU 30 of the personal computer 11 outputs the diagnosis result by the output device 34.

  As described above, when performing a deterioration diagnosis of the soft magnetic core member 2 of the transformer 1 (target device) to be diagnosed, a current (power) is actively applied to the current transformer unit 10 to obtain a measurement value. Therefore, the deterioration degree of the magnetic core member 2 can be accurately diagnosed.

  Further, even during a period after the transformer 1 (electrical equipment) having the magnetic core member 2 to be diagnosed for deterioration is installed and operated, the transformer 1 is wound around the magnetic core member 2 during maintenance. The first winding coil portion 3 is a loop coil, and the current transformer portion 10 is attached, so that the deterioration degree can be easily diagnosed.

  Further, when the current transformer unit 10 is removed from the ground wire 15, the current transformer unit 10 and the measuring device 12 can be carried. Then, the deterioration degree can be easily diagnosed by connecting the ground wire 15 to the transformer 1 that is the target of the deterioration degree and attaching the current transformer unit 10. That is, when performing deterioration diagnosis of a plurality of transformers 1, it is sufficient to have one current transformer unit 10 and one measuring device 12, and the current transformer unit 10 is sequentially replaced with the ground line 15 of the transformer 1. Can do.

  In addition, since the determination value is set based on the magnetic core member 2 whose simulated degree of deterioration is known, the magnetic core member is compared by comparing the loss characteristic value (detection information) of the magnetic core member 2 to be diagnosed with the determination value. It is possible to easily perform the diagnosis process of the degree of deterioration.

  Further, by setting the AC frequency output (oscillated) by the oscillating unit 23 of the measuring device 12 to a high frequency of 1 kHz or more, the measuring device 12 can be manufactured using a small capacitor 26. Therefore, the measuring device 12 can be downsized. The AC frequency output from the oscillating unit 23 may be a high frequency of 10 kHz or higher, 100 kHz or higher, 1 MHz or higher, 10 MHz or higher, or 100 MHz or higher.

  Further, by connecting the ground wire 15 to the first winding coil portion 3 of the transformer 1, it is possible to easily perform the operation of making the existing first winding coil portion 3 an electrically closed loop coil. In the present embodiment, the ground wire 15 is connected to the first winding coil portion 3, but the ground wire 15 may be connected to the second winding coil portion 4. Then, the existing second winding coil portion 4 is formed as an electrically closed loop coil, and the current transformer portion 10 is attached to the ground wire 15 so that the deterioration diagnosis of the magnetic core member 2 is performed. good.

  In this embodiment, the transformer 1 in the initial state and the transformer 1 to be diagnosed are described as separate objects. However, the transformer 1 in the initial state and the transformer 1 to be diagnosed may be the same. . That is, when the transformer 1 is manufactured, the loss characteristic value of the magnetic core member 2 is acquired and a determination value is set. After the transformer 1 is used over time, the loss characteristic value of the magnetic core member 2 is acquired and compared with the determination value. Thus, the degree of deterioration (deterioration state) of the magnetic core member 2 may be diagnosed.

  In the present embodiment, the determination value is set based on the loss characteristic value of the magnetic core member 2 in the initial state, and the deterioration diagnosis is performed based on the loss characteristic value and the determination value of the magnetic core member 2 to be subjected to the deterioration diagnosis. However, the detection information acquired for performing the deterioration diagnosis may not be the loss characteristic value. For example, the temperature of the magnetic core member 2 is specified based on the measured value acquired by the measuring device 12, or the temperature of the magnetic core member 2 is specified based on the loss characteristic value, and the deterioration of the magnetic core member 2 is determined based on this temperature. A diagnosis may be performed.

  In the present embodiment, the measured value used for the deterioration diagnosis of the magnetic core member 2 is a reactance value, a resistance value, or a value in which the frequency or phase of the current has changed, but other values may be used as the measured value. For example, the deterioration diagnosis of the magnetic core member 2 may be performed based on a change in the current value of the current transformer unit 10 (sensor coil 27). Further, the deterioration diagnosis of the magnetic core member 2 may be performed based on a change in the voltage value of the current transformer unit 10. Further, the deterioration diagnosis of the magnetic core member 2 may be performed based on a value in which the frequency or phase of the current flowing through the current transformer unit 10 is changed.

  In the present embodiment, the loss characteristic value of the magnetic core member 2 having a known deterioration degree is simulated. However, even if the loss characteristic value of the magnetic core member 2 having a known deterioration degree is acquired in other manners. good. For example, by attaching a current transformer unit 10 to a transformer 1 having a magnetic core member 2 that has actually deteriorated over time, a measured value is obtained, and the obtained measured value is analyzed by a personal computer 11 so that the degree of deterioration is known. The loss characteristic value of the magnetic core member 2 may be acquired. Thus, the determination value used for the deterioration diagnosis may be set based on the loss characteristic value of the magnetic core member 2 actually used over time. By using the magnetic core member 2 that has actually been used over time, it is possible to save the trouble of performing the simulation. Further, by comparing the loss characteristic value (detection information) of the magnetic core member 2 to be diagnosed with the determination value, the diagnosis process of the degree of deterioration of the magnetic core member can be easily performed.

  In the present embodiment, a deterioration diagnosis device that performs deterioration diagnosis of the magnetic core member 2 of the transformer 1 is illustrated, but reactor deterioration diagnosis may be performed using this deterioration diagnosis device. Further, the deterioration diagnosis device can perform deterioration diagnosis as long as it is an electric device having a magnetic core member. For example, this deterioration diagnosis device may be used to perform deterioration diagnosis of a magnetic core member such as an electromagnet, or deterioration of a magnetic core member included in an inductor (passive element) that can store energy in a magnetic field formed by an electric current. A diagnosis may be made.

  In the determination of the predetermined value and the determination value according to the present embodiment, “whether or not the determination value is exceeded” is determined, but this determination may be a determination of “whether or not the determination value is exceeded”. The determination may be “whether it is less than or equal to the determination value” or the determination “whether it is less than the determination value”.

  According to the embodiment described above, it is possible to accurately diagnose the deterioration degree of the magnetic core member 2 used over time by having the oscillation unit 23 that applies a specific AC voltage at a specific frequency to the current transformer unit 10. it can.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Transformer, 2 ... Magnetic core member, 3 ... 1st winding coil part, 4 ... 2nd winding coil part, 10 ... Current transformer part, 11 ... Personal computer, 12 ... Measuring apparatus, 13 ... Switch, 14 ... Switch, DESCRIPTION OF SYMBOLS 15 ... Ground line, 16 ... Wiring, 17 ... Power supply line, 20 ... Control part, 21 ... Communication part, 22 ... Analysis part, 23 ... Oscillation part, 24 ... Voltmeter, 25 ... Ammeter, 26 ... Capacitor, 27 ... Sensor coil, 28 ... Magnetic core, 30 ... CPU, 31 ... ROM, 32 ... RAM, 33 ... HDD, 34 ... Output device, 35 ... Input device, 36 ... Communication unit, 40 ... Acquisition unit, 41 ... Calculation unit, 42 ... Simulation unit, 43 ... Deterioration diagnosis unit, 44 ... Determination information storage unit, 45 ... Detection information storage unit.

Claims (5)

When the wound coil portion wound around the magnetic core member is an electrically closed loop coil, a clamp-type current transformer portion that can be attached to the coil;
An oscillating unit that is provided in the same circuit as the current transformer unit and applies a specific AC voltage to the current transformer unit at a specific frequency;
An acquisition unit that acquires detection information based on a current flowing through at least the current transformer unit when an electromagnetic induction phenomenon acting between the current transformer unit, the wound coil unit, and the magnetic core member is generated;
Determination information is set based on detection information corresponding to the magnetic core member in the initial state, and a storage unit that stores the determination information;
Based on the detection information corresponding to the magnetic core member used over time from the initial state and the determination information, a diagnosis unit that diagnoses the degree of deterioration;
An apparatus for diagnosing deterioration of a magnetic core member, comprising: 2. The deterioration diagnosis apparatus for a magnetic core member according to claim 1, wherein the specific frequency is a high frequency of 1 kHz or more. When the wound coil portion wound around the magnetic core member is an electrically closed loop coil, a clamp-type current transformer portion that can be attached to the coil;
An oscillating unit that applies a specific AC voltage to the current transformer unit at a specific frequency;
An acquisition unit that acquires detection information based on a current flowing through at least the current transformer unit when an electromagnetic induction phenomenon acting between the current transformer unit, the wound coil unit, and the magnetic core member is generated;
Determination information is set based on detection information corresponding to the magnetic core member in the initial state, and a storage unit that stores the determination information;
Based on the detection information corresponding to the magnetic core member used over time from the initial state and the determination information, a diagnosis unit that diagnoses the degree of deterioration;
With
The judgment information includes a detection information corresponding to the magnetic core members of the initial state, deterioration of the detection information and, characterized in that it is set on the basis of the magnetic center member, wherein the degree of degradation corresponds to a known magnetic core member Diagnostic device. When the wound coil portion wound around the magnetic core member is an electrically closed loop coil, a clamp-type current transformer portion that can be attached to the coil;
An oscillating unit for applying a specific AC voltage to the current transformer unit at a specific frequency;
An acquisition unit that acquires detection information based on a current flowing through at least the current transformer unit when an electromagnetic induction phenomenon acting between the current transformer unit, the wound coil unit, and the magnetic core member is generated;
Determination information is set based on detection information corresponding to the magnetic core member in the initial state, and a storage unit that stores the determination information;
Based on the detection information corresponding to the magnetic core member used over time from the initial state and the determination information, a diagnosis unit that diagnoses the degree of deterioration;
With
The winding coil portion and the loop coil by connecting the ground line, the deterioration diagnosis device for the you, characterized in that the current transformer unit is attached magnetic center member to the ground line. An attachment step of attaching a clamp-type current transformer to the coil when the wound coil portion wound around the magnetic core member is an electrically closed loop-shaped coil;
An oscillation step of applying a specific AC voltage to the current transformer unit at a specific frequency by an oscillation unit provided in the same circuit as the current transformer unit ;
An acquisition step of acquiring detection information based on a current flowing through at least the current transformer unit when an electromagnetic induction phenomenon acting between the current transformer unit, the wound coil unit, and the magnetic core member is generated;
Determination information is set based on detection information corresponding to the magnetic core member in the initial state, and a storage step for storing the determination information;
Diagnostic step of diagnosing the degree of deterioration based on the detection information corresponding to the magnetic core member used over time from the initial state and the determination information
A method for diagnosing deterioration of a magnetic core member, comprising:

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