JP2017135213A - Degradation diagnosis device of magnetic core member, degradation diagnosis method of magnetic core member, electrical apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a degradation diagnosis technique of a magnetic core member which allows for accurate diagnosis of the degree of degradation of a magnetic core member used over years.SOLUTION: A degradation diagnosis device of a magnetic core member includes: an oscillation unit 23 giving a specific AC voltage of a specific frequency to a search coil 10 surrounding a magnetic core member ; an acquisition unit for acquiring detection information based at least on the current flowing to the search coil 10; a storage unit for storing determination information that is set based on the detection information corresponding to the magnetic core member 2 in the initial state; and a diagnosis unit for diagnosing the degree of degradation based on the detection information and determination information corresponding to the magnetic core member 2 used over years from the initial state.SELECTED DRAWING: Figure 2

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. .

  A deterioration diagnosis device for a magnetic core member according to an embodiment of the present invention includes an oscillation unit that applies a specific AC voltage at a specific frequency to a search coil unit that surrounds the magnetic core member, and detection information based on at least a current flowing through the search coil unit. Determination information is set on the basis of detection information corresponding to the magnetic core member in the initial state, a storage unit for storing the determination information, and detection information corresponding to the magnetic core member that has been used from the initial state over time. And a diagnosis section for diagnosing the degree of deterioration based on the determination information.

  A deterioration diagnosis method for a magnetic core member according to an embodiment of the present invention includes an oscillation step of applying a specific alternating voltage to a search coil portion surrounding the magnetic core member at a specific frequency, and detection information based on at least a current flowing through the search coil portion. Determination information is set based on detection information corresponding to the magnetic core member in the initial state, storage step for storing the determination information, and detection information corresponding to the magnetic core member that has been used for a while from the initial state And a diagnosis step of diagnosing the degree of deterioration based on the determination information.

  An electrical device according to an embodiment of the present invention is an electrical device that can be diagnosed by a deterioration diagnosis device for a magnetic core member, and includes the magnetic core member and the search coil unit.

  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 has a search coil portion 10 surrounding the magnetic core member 2. The search coil portion 10 is annularly arranged so as to surround the entirety of the annular magnetic core member 2. Further, the search coil unit 10 is provided at a predetermined distance D from the magnetic core member 2. The search coil unit 10 is also provided at a predetermined distance from the winding coil units 3 and 4. Therefore, it is possible to electrically insulate the magnetic core member 2 and the winding coil portions 3 and 4 from the search coil portion 10. Note that the search coil portion 10 may be covered with an insulating covering member. In the transformer 1 to which a high voltage is applied, a thin insulating covering member is formed on the search coil portion 10.

  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. Note that the axial direction of the search coil portion 10 (the left-right direction of the drawing in FIG. 1) intersects the direction in which the thin plate-like iron members of the magnetic core member 2 are stacked (the depth direction of the drawing in FIG. 1). It has become. 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. The deterioration diagnosis apparatus includes a personal computer 11 (PC) that diagnoses deterioration by performing various processes, and a measurement apparatus 12 connected to the search coil unit 10. An attachment / detachment portion 13 (connector member) is provided at the tip of the cable extending from the measuring device 12 toward the search coil portion 10. The attachment / detachment portion 13 is attached to an attachment / detachment portion 14 (connector member) at the tip of a cable extending from the search coil portion 10. The personal computer 11 is connected to the measuring device 12 via a cable.

  As shown in FIG. 2, the measuring device 12 has an electric circuit connected to the search coil unit 10. The search coil unit 10 surrounds the magnetic core member 2 of the transformer 1. The electric circuit also includes an oscillating unit 23 that outputs AC power having a high frequency (specific frequency) of 1 kHz or more to the search coil unit 10 with a predetermined (constant) voltage amplitude.

  Furthermore, the measuring device 12 is provided with a voltmeter 24 that measures the voltage value of the search coil 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 search coil unit 10. The oscillation unit 23, the search coil unit 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 search coil unit 10 and the magnetic core member 2 occurs. At this time, the measurement value (detection information) of the search coil unit 10 can be acquired by analyzing the voltage value of the voltmeter 24 and the current value of the ammeter 25. The measured value may be a reactance value or a resistance value of the search coil unit 10. Further, a value obtained by changing the frequency or phase of the current flowing through the search coil 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 above-described attaching / detaching portions 13 and 14 are removed, the search coil portion 10 and the portion of the electric circuit other than the search coil portion 10 are divided. That is, the measuring device 12 can be removed from the search coil unit 10 and carried. In this way, the measuring device 12 can be hand-held. 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 information on the frequency and phase of the current flowing through the search coil unit 10 is obtained based on the voltage value of the voltmeter 24 and the current value of the ammeter 25. You can get it. The control unit 20 has an automatic tuning function that maximizes the resonance state caused by the search coil 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 a measurement value of the search coil unit 10 based on 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 search coil 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 search coil unit 10 is removed from the transformer 1. That is, the search coil unit 10 is in an air-core state (single state) that does not surround the magnetic core member 2. Then, the user controls the measuring device 12 by operating the input device 35 of the personal computer 11. The control unit 20 of the measuring device 12 controls the oscillating unit 23 and outputs high-frequency alternating current from the oscillating unit 23 at a predetermined voltage. At this time, high-frequency alternating current (current) flows through the search coil section 10 (S11: oscillation step).

  Further, the acquisition unit 40 of the control unit 20 acquires the measurement value of the search coil unit 10 by analyzing the voltage value of the voltmeter 24 and the current value of the ammeter 25 (S12: acquisition step). At this time, when the current output from the oscillating unit 23 flows to the search coil unit 10, an electromagnetic induction phenomenon occurs. However, since the search coil unit 10 is in an air-core state, the measured value of the search coil unit 10 is the magnetic core member 2. It is a value based only on the properties of the search coil section 10 without being affected by the above.

  In addition, the control unit 20 of the measuring device 12 transmits the measurement value of the search coil unit 10 in the air-centered 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.

  Next, the search coil unit 10 is attached to the transformer 1 in the initial state. That is, the search coil unit 10 is in a state of surrounding the magnetic core member 2. 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.

  Moreover, in this embodiment, it is set as the operation state (energization state) which gave electric power to the transformer 1 of an initial state. In the operating state, a current flows through the winding coil portions 3 and 4 of the transformer 1 and an electromagnetic induction phenomenon acting between the magnetic core member 2 and the winding coil portions 3 and 4 occurs. . Then, based on the eddy current loss of the magnetic core member 2 when this electromagnetic induction phenomenon occurs, the temperature of the magnetic core member 2 becomes higher than room temperature (normal temperature). Due to this increased temperature, the loss characteristic value of the magnetic core member 2 is increased more than when the transformer 1 is in a non-operating state (non-energized 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 search coil section 10 (S13: oscillation step).

  Furthermore, the acquisition unit 40 of the control unit 20 acquires the measurement value of the search coil unit 10 by analyzing the voltage value of the voltmeter 24 and the current value of the ammeter 25 (S14: acquisition step). At this time, when a current (electric power) output from the oscillating unit 23 flows into the search coil unit 10, an electromagnetic induction phenomenon that acts between the search coil unit 10 and the magnetic core member 2 occurs. Therefore, the measured value of the search coil unit 10 is affected by the eddy current loss (iron loss) of the magnetic core member 2. Specifically, the search coil unit 10 is affected by a magnetic field generated from the magnetic core member 2. In addition, a difference arises between the measured value of the search coil part 10 of the air core state mentioned above, and the measured value of the search coil part 10 attached to the magnetic core member 2 of an initial state.

  Further, the control unit 20 of the measuring device 12 transmits the measurement value of the search coil unit 10 of 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 (S15: calculation step). Specifically, a value (difference) obtained by subtracting the measured value of the search coil unit 10 in the air-core state from the measured value of the search coil unit 10 of the transformer 1 in the initial state becomes the loss characteristic value of the magnetic core member 2 in the initial state. The corresponding value. 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) (S16: 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 (S17: 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, or the determination value may change according to the electric power supplied to the transformer 1. 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. The search coil unit 10 is in a state of surrounding the magnetic core member 2 to be diagnosed. Moreover, in this embodiment, it is set as the operation state (energized state) which gave electric power to the transformer 1 of a diagnostic object. In the operating state, a current flows through the winding coil portions 3 and 4 of the transformer 1 and an electromagnetic induction phenomenon acting between the magnetic core member 2 and the winding coil portions 3 and 4 occurs. . Then, based on the eddy current loss of the magnetic core member 2 when this electromagnetic induction phenomenon occurs, the temperature of the magnetic core member 2 becomes higher than room temperature (normal temperature). Due to this increased temperature, the loss characteristic value of the magnetic core member 2 is increased more than when the transformer 1 is in a non-operating state (non-energized state).

  Furthermore, when the magnetic core member 2 is deteriorated, the eddy current loss of the magnetic core member 2 increases due to deterioration of some insulation between the laminated iron members, and the temperature of the magnetic core member 2 increases. It is raised from the magnetic core member 2 in the initial state.

  Thus, the measuring device 12 measures the measured value of the search coil unit 10 in a state where the winding coil units 3 and 4 of the transformer 1 are energized. Since the temperature of the magnetic core member 2 is increased by energizing the winding coil portions 3 and 4, eddy current loss (iron loss) is increased and the temperature is increased when the magnetic core member 2 is deteriorated. Therefore, the loss characteristic value of the magnetic core member 2 in a deteriorated state becomes high, and the difference from the loss characteristic value of the magnetic core member 2 in the initial state becomes large. Therefore, the diagnosis process of the deterioration degree of the magnetic core member 2 is easily performed. be able to.

  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 search coil section 10 (S18: oscillation step).

  Furthermore, the acquisition unit 40 of the control unit 20 acquires the measurement value of the search coil unit 10 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 (electric power) output from the oscillating unit 23 flows into the search coil unit 10, an electromagnetic induction phenomenon that acts between the search coil unit 10 and the magnetic core member 2 occurs. Therefore, the measured value of the search coil unit 10 is affected by the eddy current loss (iron loss) of the magnetic core member 2. Specifically, the search coil 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, a difference is generated between the measured values of the search coil unit 10 in the initial state.

  Further, the control unit 20 of the measuring device 12 transmits the measurement value of the search coil unit 10 of 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 measurement value of the search coil unit 10 in the air-core state from the measurement value of the search coil unit 10 of the transformer 1 to be diagnosed is the loss characteristic value of the magnetic core member 2 to be diagnosed. The corresponding value. 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 the deterioration diagnosis of the soft magnetic core member 2 of the transformer 1 (target device) to be diagnosed is performed, a current (power) is actively applied to the search coil unit 10 to obtain a measured value. Therefore, the deterioration degree of the magnetic core member 2 can be accurately diagnosed.

  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 more, 100 kHz or more, 1 MHz or more, 10 MHz or more, or 100 MHz or more. Further, the AC frequency output from the oscillating unit 23 may be a frequency that is clearly different from a predetermined frequency (for example, 50 to 60 Hz) of power supplied to the transformer 1. By doing in this way, it does not affect the transformer 1 (electric equipment) having the magnetic core member 2 that is the target of diagnosis of the degree of deterioration. Furthermore, the degree of deterioration can be diagnosed without the measuring device 12 being affected by the power supplied to the transformer 1.

  Further, when the detachable portions 13 and 14 are removed, the search coil unit 10 and the measuring device 12 are separated, so that the measuring device 12 can be easily carried. Then, by attaching the measuring device 12 to the search coil unit 10 surrounding the magnetic core member 2 that is the target of the deterioration degree, the deterioration degree can be easily diagnosed. That is, when performing deterioration diagnosis of a plurality of transformers 1, only one measuring device 12 is required, and the measuring devices 12 can be sequentially replaced with the search coil unit 10 of the transformer 1.

  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 search coil unit 10 is described as a constituent member of the transformer 1, but the search coil unit 10 may be detachable from the transformer 1. Further, the search coil unit 10 may be a constituent member of the measuring device 12. That is, the search coil unit 10, the personal computer 11, and the measuring device 12 may constitute a deterioration diagnosis device (deterioration diagnosis system).

  In the present embodiment, the measured value of the search coil unit 10 is acquired in the operating state (energized state) in which power is applied to the transformer 1, but the non-operating state in which power is not applied to the transformer 1 (non-operating state) The measured value of the search coil unit 10 may be acquired in the energized state. Then, the deterioration diagnosis of the magnetic core member 2 may be performed based on this measured value.

  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 search coil unit 10. Further, the deterioration diagnosis of the magnetic core member 2 may be performed based on a change in the voltage value of the search coil 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 search coil 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, the measured value is obtained by attaching the search coil unit 10 to the transformer 1 having the magnetic core member 2 that has actually deteriorated over time, and the obtained measured value is analyzed by the 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, the search coil portion 10 is annularly arranged along the circumferential direction of the annular magnetic core member 2. However, even if the search coil portion 10 is loosely wound spirally around the entire magnetic core member 2. good.

  In the present embodiment, the search coil portion 10 is provided at a predetermined distance D from the magnetic core member 2 and the winding coil portions 3 and 4, but when the search coil portion 10 is covered with a covering member, The search coil portion 10 may be disposed so as to contact the magnetic core member 2 and the winding coil portions 3 and 4.

  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, the search coil unit 10 surrounding the magnetic core member 2 has the oscillating unit 23 that applies a specific AC voltage at a specific frequency, thereby diagnosing the degree of deterioration of the magnetic core member 2 used over time. Can be done accurately.

  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 ... Search coil part, 11 ... Personal computer, 12 ... Measuring apparatus, 13 ... Detachable part, 14 ... Detachable , 20 ... control part, 21 ... communication part, 22 ... analysis part, 23 ... oscillation part, 24 ... voltmeter, 25 ... ammeter, 26 ... capacitor, 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 Department.

Claims (7)

An oscillation unit that applies a specific AC voltage at a specific frequency to a search coil unit that surrounds the magnetic core member;
An acquisition unit for acquiring detection information based on at least a current flowing through the search coil unit;
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:   The detection information corresponding to the magnetic core member in the initial state is obtained by subtracting the measurement value based on the search coil portion in the empty state from the measurement value based on the search coil portion surrounding the magnetic core member in the initial state. The deterioration diagnosis device for a magnetic core member according to claim 1.   The determination information is set based on detection information corresponding to the magnetic core member in the initial state and detection information corresponding to a magnetic core member whose degradation degree is known. 2. A deterioration diagnosis device for a magnetic core member according to 2.   The deterioration diagnosis device for a magnetic core member according to any one of claims 1 to 3, wherein the specific frequency is a high frequency of 1 kHz or more. An attachment / detachment part for attaching / detaching the search coil part and a part other than the search coil part;
5. The deterioration diagnosis device for a magnetic core member according to claim 1, wherein a portion other than the search coil portion can be carried by removing the search coil portion. An oscillation step of applying a specific AC voltage at a specific frequency to the search coil portion surrounding the magnetic core member;
An acquisition step of acquiring detection information based on at least a current flowing in the search coil section;
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: An electrical device capable of being diagnosed by the deterioration diagnosis device for a magnetic core member according to any one of claims 1 to 5,
An electric device comprising the magnetic core member and the search coil portion.

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