WO2021130987A1 - 短絡検知装置及び短絡検知方法 - Google Patents

短絡検知装置及び短絡検知方法 Download PDF

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Publication number
WO2021130987A1
WO2021130987A1 PCT/JP2019/051236 JP2019051236W WO2021130987A1 WO 2021130987 A1 WO2021130987 A1 WO 2021130987A1 JP 2019051236 W JP2019051236 W JP 2019051236W WO 2021130987 A1 WO2021130987 A1 WO 2021130987A1
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Prior art keywords
signal
detection signal
short circuit
detection
magnetic flux
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Ceased
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PCT/JP2019/051236
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English (en)
French (fr)
Japanese (ja)
Inventor
勇二 滝澤
米谷　晴之
山本　篤史
前田　進
伸明 榁木
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to CN201980103057.5A priority Critical patent/CN114830512A/zh
Priority to DE112019008006.7T priority patent/DE112019008006T5/de
Priority to PCT/JP2019/051236 priority patent/WO2021130987A1/ja
Priority to JP2021566702A priority patent/JP7226589B2/ja
Priority to US17/770,053 priority patent/US20220390519A1/en
Publication of WO2021130987A1 publication Critical patent/WO2021130987A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/16—Synchronous generators
    • H02K19/36—Structural association of synchronous generators with auxiliary electric devices influencing the characteristic of the generator or controlling the generator, e.g. with impedances or switches
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/346—Testing of armature or field windings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/225—Detecting coils
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
    • H03K5/24—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/06—Machines characterised by the presence of fail safe, back up, redundant or other similar emergency arrangements

Definitions

  • the present disclosure relates to a short circuit detection device and a short circuit detection method for detecting a short circuit in a field winding of a rotary electric machine.
  • a magnetic flux detector such as a search coil that detects a magnetic flux generated in a gap between a rotor and a stator is used to detect the field.
  • a device for detecting a change in field magnetic flux due to a short circuit in a winding has been proposed.
  • the device that detects a short circuit in the field winding is a short-circuited magnetic pole, which is the other magnetic pole that has a short circuit, with respect to the healthy magnetic pole, which is one of the two magnetic poles of the rotor that has not been short-circuited.
  • the short-circuit detection device detects the occurrence of a short circuit by comparing the amount of field magnetic flux reduced due to a short circuit with the amount of field magnetic flux at sound, which is the amount of field magnetic flux acquired in advance when no short circuit has occurred. (See, for example, Patent Document 1).
  • Another short-circuit detection device is configured to detect the occurrence of a short-circuit by comparing the amount of field magnetic flux acquired by two magnetic poles having different 180 deg rotation angles (see, for example, Patent Document 2). ..
  • the present disclosure has been made to solve the above-mentioned problems, and it is possible to suppress a decrease in the detection accuracy of false detection and short circuit due to preliminary measurement, and to detect a short circuit of the field winding more accurately.
  • the purpose is to obtain a short circuit detection device and a short circuit detection method.
  • the short circuit detection device acquires one detection signal corresponding to the magnetic flux from a magnetic flux detector that detects the magnetic flux generated in the gap between the rotor and the stator of the rotating electric machine, and obtains one detection signal according to the magnetic flux, and obtains a first detection signal.
  • the signal acquisition unit to be the second detection signal
  • the signal processing unit that frequency-analyzes the first detection signal and generates and decodes the voltage signal simulating the voltage state at the time of soundness, and the signal processing unit is decoded. It is provided with a signal comparison unit that detects a short circuit in the field winding of the rotary electric machine by comparing the decoded signal with the second detection signal sent from the signal acquisition unit.
  • the first detection signal and the first detection signal of different magnetic poles according to the magnetic flux are transmitted from the magnetic flux detector that detects the magnetic flux generated in the gap between the rotor and the stator of the rotating electric machine.
  • a signal acquisition unit that acquires as the detection signal of 2
  • a signal processing unit that frequency-analyzes the first detection signal and generates and decodes a voltage signal that matches the phase of the second detection signal
  • a signal processing unit that decodes the voltage signal. It is provided with a signal comparison unit that detects a short circuit in the field winding of the rotary electric machine by comparing the decoded signal to be generated with the second detection signal.
  • one detection signal corresponding to the magnetic flux is acquired from a magnetic flux detector that detects the magnetic flux generated in the gap between the rotor and the stator of the rotating electric machine, and the first detection signal is obtained.
  • a step of using the second detection signal, a step of frequency-analyzing the first detection signal to generate and decode a voltage signal simulating a sound voltage state, a decoded decoding signal, and a second It includes a step of detecting a short circuit in the field winding of a rotary electric machine by comparing it with a detection signal.
  • the first detection signal and the first detection signal of different magnetic poles according to the magnetic flux are transmitted from the magnetic flux detector that detects the magnetic flux generated in the gap between the rotor and the stator of the rotating electric machine.
  • the step of acquiring as the detection signal of 2, the step of frequency-analyzing the first detection signal, generating and decoding the voltage signal matching the phase of the second detection signal, the decoded decoding signal, and the second It is provided with a step of detecting a short circuit of the field winding of the rotary electric machine by comparing with the detection signal of.
  • one acquired detection signal is used as a first detection signal and a second detection signal, and a voltage simulating a sound state from the second detection signal and the first detection signal.
  • the short-circuit detection device generates and decodes a voltage signal that matches the phase of the second detection signal from the second detection signal and the first detection signal acquired by a magnetic pole different from the second detection signal. By comparing with the decoded signal, it is possible to suppress a decrease in the detection accuracy of erroneous detection and short circuit due to preliminary measurement, and detect a short circuit of the field winding.
  • one acquired detection signal is used as a first detection signal and a second detection signal, and a voltage simulating a sound state from the second detection signal and the first detection signal.
  • the short-circuit detection method generates and decodes a voltage signal that matches the phase of the second detection signal from the second detection signal and the first detection signal acquired by a magnetic pole different from the second detection signal. By comparing with the decoded signal, it is possible to suppress a decrease in the detection accuracy of erroneous detection and short circuit due to preliminary measurement, and detect a short circuit of the field winding.
  • FIG. It is a block diagram of the short circuit detection apparatus and the rotary electric machine which concerns on Embodiment 1.
  • FIG. It is a hardware block diagram of the short circuit detection apparatus which concerns on Embodiment 1.
  • FIG. This is an example of a voltage waveform detected by the search coil according to the first embodiment.
  • This is an example of a flowchart of the short circuit detection method according to the first embodiment. It is an example of the figure which showed the graph of the frequency in each case of a healthy state, a short circuit time, and a simulated healthy state which concerns on Embodiment 1.
  • FIG. This is an example of a flowchart of the short circuit detection method according to the second embodiment.
  • FIG. 1 is a configuration diagram of a rotary electric machine 200 to which the short-circuit detection device 100a and the short-circuit detection device 100a according to the present embodiment are applied.
  • a turbine generator is used for the rotary electric machine 200.
  • the rotary electric machine 200 includes a rotor 1 provided rotatably and a stator 2 provided outside the rotor 1.
  • the outer peripheral portion of the rotor 1 and the inner peripheral portion of the stator 2 face each other with the gap 3 interposed therebetween.
  • a plurality of rotor slots 5 are formed in the rotor core 4 of the rotor 1. Field windings connected in series are wound around the plurality of rotor slots 5.
  • the field winding is DC excited from an external power source so that the rotor core 4 is excited to two poles. As a result, two magnetic poles 6 are formed on the rotor core 4.
  • a plurality of stator slots 8 are formed in the stator core 7 of the stator 2.
  • a multi-phase winding 9 is wound around the plurality of stator slots 8.
  • the multi-phase winding 9 is AC-excited so that a rotating magnetic field is generated in the gap 3.
  • the rotary electric machine 200 shown in FIG. 1 is a two-pole generator having 32 rotor slots 5 and 84 stator slots 8.
  • the arrow A in the clockwise direction in FIG. 1 represents the rotation direction of the rotor 1.
  • a magnetic flux detector 10 for detecting the radial magnetic flux generated in the gap 3 between the rotor 1 and the stator 2 of the rotary electric machine 200 is fixedly provided in the portion of the stator 2 facing the gap 3.
  • the magnetic flux detector 10 is, for example, a search coil.
  • the main magnetic flux generated in the gap 3 and the leakage flux of the rotor slot 5 are interlinked with each other. Therefore, a voltage corresponding to the magnetic flux interlinking with the magnetic flux detector 10 is generated between the terminals at both ends of the magnetic flux detector 10.
  • the distribution of the magnetic flux interlinking with the magnetic flux detector 10 corresponds to the rotation angle of the rotor 1, and the search coil voltage signal corresponding to the amount of interlinkage magnetic flux is output from the magnetic flux detector 10.
  • a short circuit detection device 100a is connected to the magnetic flux detector 10.
  • the short circuit detection device 100a includes a signal acquisition unit 101, a signal processing unit 102a, and a signal comparison unit 103.
  • the signal acquisition unit 101 acquires the voltage waveform of the detection signal acquired by the magnetic flux detector 10.
  • the signal processing unit 102a uses the detection signal acquired from the signal acquisition unit 101 as the first detection signal to generate and output a decoding signal corresponding to the first detection signal.
  • the signal processing unit 102a includes a frequency analysis unit 11, a filter processing unit 12a, a simulated signal generation unit 13, and a signal decoding unit 14. The detailed processing of each part will be described later.
  • the signal comparison unit 103 has a difference voltage calculation unit 15 and a short circuit detection unit 16.
  • the signal comparison unit 103 uses the detection signal sent from the signal acquisition unit 101 to the signal comparison unit 103 as the second detection signal, the voltage waveform of the second detection signal, and the first detection decoded by the signal processing unit 102a.
  • the waveform of the difference from the voltage waveform of the signal decoding signal is calculated, and the short circuit of the field winding is detected from the calculated difference waveform.
  • the arrow B indicates the path of the signal excluding the short-circuit information
  • the arrow C indicates the path of the detection signal including the short-circuit information.
  • FIG. 2 is an example of a hardware configuration diagram of the short circuit detection device 100a according to the present embodiment.
  • the short-circuit detection device 100a includes a processor 300 and a storage device 400 as a hardware configuration.
  • the storage device 400 is composed of, for example, a memory in which a program describing a process corresponding to the function of the short circuit detection device 100a is stored.
  • the processor 300 realizes the function of the short-circuit detection device 100a by executing the program stored in the storage device 400.
  • the processor 300 is composed of a processor logically configured in a hardware circuit such as a microcomputer, a DSP (Digital Signal Processor), or an FPGA.
  • the plurality of processors 300 and the plurality of storage devices 400 may cooperate to realize the function of the short circuit detection device 100a.
  • FIG. 3A shows a case where the signal processing unit 102a according to the present embodiment simulates a sound state
  • FIG. 3B shows a rotary electric machine detected by the signal acquisition unit 101 according to the present embodiment.
  • the case of 200 three-phase short circuit is shown.
  • FIG. 3 (A1) is a waveform of the magnetic flux density when the signal processing unit 102a according to the present embodiment simulates a healthy state
  • FIG. 3 (A2) is a voltage waveform when simulating a healthy state. .. The process of simulating a healthy state will be described later.
  • FIG. 1 shows a case where the signal processing unit 102a according to the present embodiment simulates a sound state
  • FIG. 3B shows a rotary electric machine detected by the signal acquisition unit 101 according to the present embodiment.
  • FIG. 3 (A1) is a waveform of the magnetic flux density when the signal processing unit 102a according to the present embodiment simulates a healthy state
  • FIG. 3 (A2) is a voltage waveform when simulating
  • FIG. 3 (B1) is a waveform of the magnetic flux density at the time of a short circuit detected by the signal acquisition unit 101 according to the present embodiment
  • FIG. 3 (B2) is a voltage waveform of the magnetic flux detector 10 detected at the time of a short circuit.
  • FIG. 3 (B3) is a waveform of the difference voltage between the voltage waveform at the time of short circuit and the voltage waveform at the time of simulating the sound state. The process for obtaining FIG. 3 (B3) will be described later.
  • the voltage waveform was obtained by electromagnetic field analysis, and for the sake of explanation, the figures showing the change in the void magnetic flux density at the rotation angle corresponding to the graph B1 are shown side by side.
  • the horizontal axis represents the rotation angle of the rotor 1.
  • the positional relationship of the rotor 1 of the rotary electric machine 200 shown in FIG. 1 is defined as a rotation angle of 0 deg.
  • the rotation angle of 90 deg is the center angle of the short-circuited magnetic pole in which the short circuit has occurred
  • the rotation angle of 270 deg is the center angle of the sound magnetic pole in which the short circuit has not occurred.
  • the short-circuit magnetic pole is indicated by an arrow Q.
  • the sound magnetic poles are indicated by arrows R.
  • the short-circuit slot the amount of field magnetic flux generated by the short-circuit was reduced as compared with the rotor slot 5 on the short-circuit magnetic pole side and the rotor slot 5 on the healthy magnetic pole side with different 180 deg phases around which the short circuit did not occur. A voltage decrease is seen.
  • the search coil voltage waveform including this short-circuit information will be described below.
  • FIG. 4 is a flowchart of the short circuit detection method according to the present embodiment.
  • FIG. 5 is a diagram showing a graph of frequencies in each of the cases of soundness, short circuit, and simulated soundness.
  • the horizontal axis of FIG. 5 is a component of each order included in the voltage waveform, and the vertical axis represents the voltage.
  • the order n (n 1, 2, 7)
  • n 1, 2, ...)
  • the first order is the order of the components that fluctuate once in one rotation of the rotor 1. This will be described with reference to FIG. 5 along the steps of the flowchart of FIG.
  • the signal acquisition unit 101 acquires the detection signal of the magnetic flux detector 10.
  • one detection signal is acquired and used as the first detection signal and the second detection signal.
  • the first detection signal is sent to the frequency analysis unit 11 included in the signal processing unit 102a.
  • the second detection signal is sent to the signal comparison unit 103.
  • the detection signal acquired and transmitted in step S10 includes short-circuit information.
  • step S11 of FIG. 4 the frequency analysis unit 11 frequency-analyzes the waveform of the first detection signal of the transmitted magnetic flux detector 10.
  • FIG. 5 (A) shows a graph of frequencies at the time of soundness.
  • FIG. 5B shows a graph of the frequency analysis result by the frequency analysis unit 11.
  • FIG. 5C shows a graph of the frequency at the time of simulated soundness.
  • FIG. 5 (B) is a result of frequency analysis of the voltage waveform of FIG. 3 (B2). From FIG. 5B, it can be seen that the order of the rotor slot 5 having a 49.5 deg pitch is the main component of the odd-order component. Further, it can be seen that the even-order components are significantly increased in FIG. 5 (B) as compared with FIG. 5 (A).
  • step S12 of FIG. 4 the filter processing unit 12a processes the amplitude based on the result of frequency analysis. Specifically, a filter process is performed in which at least one of the absolute values of the even-order components shown in FIG. 5B is sufficiently smaller than the absolute value of the odd-numbered components.
  • FIG. 5C is a frequency graph when filtering is performed from FIG. 5B to simulate a healthy state.
  • the absolute value of the even-order component is set to be sufficiently smaller than the absolute value of the odd-order component, but it may be set to 0 as long as it is close to the state at the time of soundness.
  • the absolute value of the even-order component smaller than the maximum value of the odd-order component which is the order of the rotor slot 5 may be sufficiently smaller than the absolute value of the odd-order component.
  • step S13 of FIG. 4 the simulated signal generation unit 13 generates a simulated voltage signal from the result of the filter processing obtained in step S12.
  • step S14 of FIG. 4 the signal decoding unit 14 performs decoding processing from the simulated voltage signal generated in step S13 by using, for example, an inverse Fourier transform. Decoding the absolute value of the simulated healthy frequency analysis result shown in FIG. 5 (C) and the phase of the short-circuited frequency analysis result shown in FIG. 5 (B) into the simulated healthy voltage waveform shown in FIG. 4 (A2). Perform processing. In the series of decoding processes, the phases of the voltage waveforms are not deviated from each other. This is clear from the fact that the waveform of the magnetic flux density of FIG. 3 (A1) obtained by integrating FIG. 3 (A2) shows the same phase as the waveform of the magnetic flux density of FIG. 3 (B1).
  • the number of samplings can be arbitrarily set during the decoding process. Even when a plurality of voltage waveforms are acquired, sampling data having the same rotation angle can be obtained. From FIG. 3 (A2), it can be seen that no decrease in voltage is observed at the rotation angle corresponding to the short-circuit slot seen in FIG. 3 (B2). That is, it can be said that FIG. 3 (A2) simulates a state in which a short circuit does not occur.
  • the signal decoding unit 14 sends the simulated result to the difference voltage calculation unit 15 of the signal comparison unit 103.
  • step S15 of FIG. 4 the difference voltage calculation unit 15 calculates the difference voltage between the transmitted decoding signal and the second detection signal sent from the signal acquisition unit 101. That is, the difference shown in FIG. 3 (B3) is obtained by removing the short-circuit information from the voltage waveform of FIG. 3 (B2) including the short-circuit information and dividing the voltage waveform of FIG. 3 (A2) simulating the sound state. Obtain a voltage waveform. The magnitude of the difference voltage is derived from the even-order component processed by the filter processing unit 12a.
  • step S16 of FIG. 4 the short circuit detection unit 16 detects a short circuit from the difference voltage waveform obtained in step S15.
  • a rotation angle of 360 deg, for example, from FIG. 3 (B3) two pairs of short-circuit slots T are detected. Comparing the voltage waveform at the detected rotation angle in FIG. 3 (B3) with FIG. 3 (B2), it can be seen that the pair in which the voltage is reduced is a true short-circuit slot.
  • FIG. 6 is a graph showing a difference voltage waveform for each angle error and a graph showing a difference voltage error for each angle error.
  • FIGS. 6A, 6B, and 6C the difference voltage waveform between the voltage waveform on the short-circuit magnetic pole side and the voltage waveform on the healthy magnetic pole side having different 180 deg rotation angles is obtained according to the angle error between the two. is there.
  • FIG. 6A is a graph showing the difference voltage waveform when there is no angle error.
  • FIG. 6B is a graph showing the difference voltage waveform when the angle error is 0.1 deg.
  • FIG. 6C is a graph when the angle error is 0.2 deg.
  • 6 (D) is a graph showing the relationship between the angle error and the difference voltage error from FIGS. 6 (A) to 6 (C).
  • the error Z1 of the generated difference voltage shows 0.5V. Since the error Z1 of the difference voltage is sufficiently small with respect to the signal level of 3.5 V in the short-circuit slot, it is considered that the possibility of erroneous detection is low.
  • the error Z2 of the generated difference voltage exceeds about 5.0 V. Therefore, it is highly likely that the short circuit detection will be erroneously detected.
  • the difference voltage error Z3 is approximately 100V. Therefore, it is considered that there is a higher possibility that the short circuit detection is erroneously detected. From FIG. 6D, it can be said that when an angle error occurs, the error of the difference voltage increases approximately proportionally. From FIGS. 6 (A) to 6 (D), it is considered that the angle error must be 0.01 deg or less in order to make the difference voltage error 0.5 V or less.
  • the absolute value of the even-numbered component is made sufficiently smaller than the absolute value of the even-numbered component, but the absolute value of the even-numbered component is kept as it is and is odd. It is also possible to make the absolute value of the next component significantly different from the absolute value of the even order component, for example, 1000 times.
  • one acquired detection signal is used as a first detection signal and a second detection signal, and a voltage signal generated by simulating a healthy state from the first detection signal and a second detection signal. Since the comparison with the detection signal of No. 2 is performed, preliminary measurement is not required, and measurement error due to a change in operating conditions can be suppressed. It is possible to suppress measurement errors and accurately detect the number of short circuits and the location of short circuits.
  • the short circuit can be detected accurately without causing an error of the difference voltage due to an error of the time axis and the rotation angle. Since it is not necessary to shorten the sampling time to be measured in order to reduce the phase shift, the amount of data can be reduced and the storage device and the communication device can be miniaturized. As the data capacity is reduced, long-term monitoring becomes possible.
  • Embodiment 2 The difference between the short-circuit detection device according to the first embodiment and the short-circuit detection device according to the second embodiment is the difference in the voltage signal to be decoded.
  • a short circuit is detected by comparing the voltage value of the voltage signal decoded by simulating a healthy state with the measured voltage value.
  • the voltage value of the voltage signal decoded so as to match the phase with the measured voltage value is compared with the measured voltage value to detect a short circuit.
  • FIG. 7 is a configuration diagram of a rotary electric machine 200 to which the short-circuit detection device 100b and the short-circuit detection device 100b according to the present embodiment are applied.
  • a turbine generator is used for the rotary electric machine 200.
  • a short circuit detection device 100b is connected to the magnetic flux detector 10.
  • the short circuit detection device 100b includes a signal acquisition unit 101, a signal processing unit 102b, and a signal comparison unit 103. Similar to the first embodiment, the signal acquisition unit 101 acquires the first detection signal from the magnetic flux detector 10. In the present embodiment, a second detection signal of a magnetic pole different from the first detection signal is further acquired.
  • the signal processing unit 102b generates and outputs a decoding signal corresponding to the first detection signal acquired from the signal acquisition unit 101.
  • the signal processing unit 102b includes a frequency analysis unit 11, a filter processing unit 12b, a voltage signal generation unit 23, and a signal decoding unit 14. The detailed processing of each part will be described later.
  • the arrow D indicates a short-circuit information path including information on the short-circuit location.
  • FIG. 8 is a flowchart of the short circuit detection method according to the present embodiment. This will be described with reference to the steps in the flowchart of FIG.
  • the signal acquisition unit 101 acquires a detection signal from the magnetic flux detector 10 in the same manner as in step S10 of FIG. 4 of the first embodiment. At this time, the detection signals of different magnetic poles are acquired and used as the first detection signal and the second detection signal.
  • the first detection signal is sent to the frequency analysis unit 11 included in the signal processing unit 102b. Further, the second detection signal is sent to the signal comparison unit 103. Further, the phase information of the second detection signal is sent to the filter processing unit 12b of the signal processing unit 102b.
  • step S21 of FIG. 8 the frequency analysis unit 11 frequency-analyzes the waveform of the first detection signal of the sent magnetic flux detector 10.
  • the determined result is sent to the short circuit detection unit 16 as short circuit information D.
  • step S22 of FIG. 8 the filter processing unit 12b performs processing with respect to the phase based on the result of frequency analysis. Specifically, a process of shifting the phase of each order of the first detection signal so as to match the phase of the second detection signal is performed. In the filter processing unit 12b according to the present embodiment, the phase is shifted, but the absolute value of each order is not changed.
  • step S23 of FIG. 8 the voltage signal generation unit 23 generates a voltage signal from the result of the filter processing obtained in step S22.
  • step S24 of FIG. 8 the signal decoding unit 14 performs decoding processing from the voltage signal generated in step S23 by using, for example, an inverse Fourier transform. At the time of decoding, the decoding process is performed according to the sampling number of the second detection signal. The signal decoding unit 14 sends the decoded result to the difference voltage calculation unit 15 of the signal comparison unit 103.
  • step S25 of FIG. 8 the difference voltage calculation unit 15 calculates the difference voltage between the decoded first detection signal and the second detection signal sent from the signal acquisition unit 101. That is, it is possible to obtain a difference voltage between the first voltage signal having the same phase and the second voltage signal.
  • the short circuit detection unit 16 detects a short circuit from the difference voltage waveform and the short circuit information D obtained in step S25.
  • the short circuit can be detected as compared with the state at the time of sound, as in the first embodiment.
  • the short circuit can be detected by comparing the location including the location where the short circuit occurs.
  • step S20 the second detection signal of the magnetic pole different from the first detection signal is acquired.
  • the detection signal in which no short circuit has occurred is acquired as the first detection signal. You may.
  • the detection signal in which a short circuit has not occurred may be held in advance in, for example, a signal recording device connected to the signal acquisition unit 101, and the signal acquisition unit 101 may acquire the detection signal from the signal recording device.
  • the short-circuit detection device 100b as in the first embodiment, even if the detection timings of the two voltages by the magnetic flux detector 10 are different, decoding is performed so that the phases of the two voltages match. Measurement is not required, and the adverse effect of load fluctuation can be avoided.
  • first and second embodiments have been described as examples of the present disclosure, the present disclosure is not limited to the respective configurations of the first and second embodiments, and is carried out within a range not deviating from the purpose of the present disclosure. It is possible to appropriately combine the respective configurations of the first and second forms, to add some modifications to each configuration, and to partially omit each configuration.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Nonlinear Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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PCT/JP2019/051236 2019-12-26 2019-12-26 短絡検知装置及び短絡検知方法 Ceased WO2021130987A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201980103057.5A CN114830512A (zh) 2019-12-26 2019-12-26 短路检测装置以及短路检测方法
DE112019008006.7T DE112019008006T5 (de) 2019-12-26 2019-12-26 Kurzschluss-detektionseinrichtung und kurzschluss-detektionsverfahren
PCT/JP2019/051236 WO2021130987A1 (ja) 2019-12-26 2019-12-26 短絡検知装置及び短絡検知方法
JP2021566702A JP7226589B2 (ja) 2019-12-26 2019-12-26 短絡検知装置及び短絡検知方法
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US12560651B2 (en) 2020-07-08 2026-02-24 Mitsubishi Generator Co., Ltd. Short-circuit detection device for rotating electric machine, and short-circuit detection method

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CN115524589B (zh) * 2022-09-30 2026-04-14 陕西航空电气有限责任公司 一种少匝电枢组件匝间冲击耐压试验工装

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US12313685B2 (en) 2021-03-10 2025-05-27 Mitsubishi Generator Co., Ltd. Short circuit detection device for rotating electrical machine

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