Method and device for measuring dynamic frequency-domain impedance of generator rotor

Abstract

The present invention provides a method and device for measuring the dynamic frequency-domain impedance of a generator rotor. The method includes: measuring the rotational speed and reference position of the rotor to be measured; determining a scanning mode according to the rotational speed, where the scanning mode includes a single-scan mode and a partitioned cyclic scanning mode; the partitioned cyclic scanning mode is achieved by equally dividing the rotor to be measured into multiple sector regions and separately scanning each sector region in sequence; configuring scanning parameters according to the rotational speed, reference position, and scanning mode; scanning the rotor to be measured according to the scanning parameters to obtain the dynamic frequency-domain impedance of the rotor to be measured. This application selects different scanning modes according to different rotational speeds of the rotor, and realizes alignment in the rotor position according to the reference position during sub-measurements, solving the problem of time-sharing in dynamic impedance testing; the partitioned cyclic scanning realizes a complete spectrum scan of different positions of the rotor, facilitating the use of spectrum characteristics for turn-to-turn short-circuit diagnosis, and achieving coordination between the impedance scanning time and the rotor rotation period.

Description

Technical Field

[0001] This application relates to the technical field of generator rotor inter-turn fault diagnosis, and specifically to a method and device for measuring the dynamic frequency-domain impedance of a generator rotor. Background Art

[0002] The impedance spectrum of a generator rotor plays a crucial role in the detection of the fault state of the generator rotor winding. For a new unit, the initial impedance spectrum without faults can be retained, and then the current impedance spectrum can be collected in the same way after the unit is in operation. By comparing the initial impedance spectrum and the current impedance spectrum, the fault diagnosis and location of the rotor winding can be determined. For units without an initial spectrum retained, a method of comparing the input impedance at the head end (positive pole) and the input impedance at the tail end (negative pole) of the rotor winding can be used for fault diagnosis. This is because the rotor winding has a high degree of symmetry, and for a rotor winding with good insulation, the input impedance characteristics at the head end (positive pole) and the tail end (negative pole) of the rotor are the same.

[0003] The existing fault diagnosis and location methods using gain spectrum and bispectrum analysis exactly utilize the comparison between the currently measured rotor impedance spectrum and the initial impedance spectrum in the previously measured intact state or the comparison of the impedance characteristics of the currently measured positive and negative ports of the rotor, and extract the difference features for fault diagnosis and location. What it solves is the problem of how to perform diagnosis after obtaining the rotor spectrum under a determined rotor state. In practical engineering applications, the inter-turn short circuit of the rotor winding often has dynamic characteristics, that is, the inter-turn short circuit of the generator set is unstable at different speeds. There is an inter-turn short circuit at some speeds and the short circuit disappears at some speeds. This is mainly related to the force on the short-circuit associated turns of the winding. More particularly, at low speeds, the rotor inter-turn short circuit is significantly affected by gravity and shows a correlation with the rotational position of the rotor. Therefore, performing a scan of the rotor impedance spectrum in these states is completely different from the static test of the rotor. The influence of the rotor speed and position needs to be considered to obtain an accurate impedance spectrum.

[0004] In summary, we need to further consider the time-sharing problem of impedance measurement and the coordination problem between the impedance scan time and the rotor period. Summary of the Invention

[0005] To solve the problem that it is difficult to effectively measure the dynamic impedance of the rotor in the prior art, on the first aspect, this application provides a method for measuring the dynamic frequency-domain impedance of a generator rotor, including:

[0006] Measuring the rotational speed and reference position of the rotor to be measured;

[0007] Determine the scanning mode according to the rotational speed, where the scanning mode includes a single scanning mode and a partition cyclic scanning mode; the partition cyclic scanning mode is achieved by equally dividing the rotor to be measured into multiple fan-shaped regions and separately scanning each fan-shaped region in sequence;

[0008] Configure scanning parameters according to the reference position and the scanning mode;

[0009] Scan the rotor to be measured according to the scanning parameters to obtain the dynamic frequency-domain impedance of the rotor to be measured.

[0010] In one embodiment, when only one key-phase mark is preset on the rotor to be measured, the measuring the rotational speed and reference position of the rotor to be measured includes:

[0011] Collect the pulse signal when the preset key-phase mark on the rotor to be measured passes through the probe position, where the distance between the probe and the rotor to be measured is fixed;

[0012] Determine the reference position of the rotor to be measured according to the moment when the rising edge of the pulse signal occurs; and

[0013] Determine the rotational speed of the rotor to be measured according to the acquisition time and the number of pulse signals collected within the acquisition time.

[0014] In one embodiment, the determining the scanning mode according to the rotational speed includes:

[0015] Detect whether the rotational speed exceeds a preset threshold. If so, determine the scanning mode as the single scanning mode;

[0016] If not, determine the scanning mode as the partition cyclic scanning mode.

[0017] In one embodiment, when the scanning mode is the partition cyclic scanning mode, the configuring the scanning parameters according to the reference position and the scanning mode includes:

[0018] Obtain the number of equal partitions of the rotor to be measured in the partition cyclic scanning mode;

[0019] Determine the passing time of each equal partition according to the number of equal partitions and the rotational speed; and

[0020] Determine the trigger moment corresponding to each equal partition according to the reference position and the passing time respectively.

[0021] In one embodiment, when the scanning mode is the partition cyclic scanning mode and corresponding key-phase marks are preset on each equal partition of the rotor to be measured, the configuring the scanning parameters according to the reference position and the scanning mode includes:

[0022] Collect the pulse signal when the key phase mark preset on the rotor to be measured passes through the probe position, and the distance between the probe and the rotor to be measured is fixed;

[0023] Determine multiple reference positions of the rotor to be measured according to the pulse signal and the corresponding relationship between the preset reference position and the key phase mark;

[0024] Determine the trigger time corresponding to each equal division area according to the corresponding relationship between the preset reference position and the equal division area and the rising edge time of the corresponding pulse signal.

[0025] In one embodiment, the scanning the rotor to be measured according to the scanning parameters to obtain the dynamic frequency domain impedance of the rotor to be measured includes:

[0026] Perform scans respectively at the trigger times of each equal division area to obtain the dynamic frequency domain impedance diagrams of each equal division area of the rotor to be measured.

[0027] In one embodiment, the method for measuring the dynamic frequency domain impedance of the generator rotor further includes:

[0028] Judge whether the passing time of the equal division area is less than the total measurement time;

[0029] If so, divide the scanning frequency band of the equal division area into multiple continuous frequency bands so that the measurement time of each frequency band is less than the passing time of the equal division area.

[0030] In one embodiment, the scanning the rotor to be measured according to the scanning parameters to obtain the dynamic frequency domain impedance of the rotor to be measured includes:

[0031] Perform scans of multiple frequency bands of the equal division area respectively at the trigger time of the equal division area to obtain the dynamic frequency domain impedance diagrams corresponding to each frequency band;

[0032] Perform splicing processing on the dynamic frequency domain impedance diagrams of each frequency band to obtain the dynamic frequency domain impedance diagram of the equal division area.

[0033] In a second aspect, the present application provides a device for measuring the dynamic frequency domain impedance of a generator rotor, including:

[0034] A rotational speed determination module, configured to measure the rotational speed and reference position of the rotor to be measured;

[0035] A scan mode determination module, configured to determine the scan mode according to the rotational speed, and the scan mode includes a single scan mode and a partition cyclic scan mode; the partition cyclic scan mode is realized by equally dividing the rotor to be measured into multiple fan-shaped areas and sequentially performing individual scans on each fan-shaped area;

[0036] A scan parameter determination module, configured to configure scan parameters according to the reference position and the scan mode;

[0037] An impedance measurement module, configured to scan a rotor under test according to the scanning parameters to obtain the dynamic frequency-domain impedance of the rotor under test.

[0038] In one embodiment, the rotation speed determination module includes:

[0039] A reference position determination unit, configured to collect a pulse signal when a key phase mark preset on the rotor under test passes through the probe position when there is only one key phase mark preset on the rotor under test in advance, the distance between the probe and the rotor under test is fixed; and determine the reference position of the rotor under test according to the moment when the rising edge of the pulse signal is generated;

[0040] A rotation speed determination unit, configured to determine the rotation speed of the rotor under test according to the acquisition time and the number of pulse signals acquired within the acquisition time.

[0041] In one embodiment, the scanning mode determination module is specifically configured to:

[0042] Detect whether the rotation speed exceeds a preset threshold. If so, determine that the scanning mode is a single scanning mode;

[0043] If not, determine that the scanning mode is a partitioned cyclic scanning mode.

[0044] In one embodiment, the scanning parameter determination module includes:

[0045] An equal division number determination unit, configured to obtain the equal division number of the rotor under test in the partitioned cyclic scanning mode when the scanning mode is the partitioned cyclic scanning mode;

[0046] A passing time determination unit, configured to determine the passing time of each equal division according to the equal division number and the rotation speed; and

[0047] A trigger moment determination unit, configured to determine the trigger moment corresponding to each equal division according to the reference position and the passing time respectively.

[0048] In one embodiment, the reference position determination unit is further configured to: when the scanning mode is the partitioned cyclic scanning mode and corresponding key phase marks are preset on each equal division of the rotor under test in advance, collect a pulse signal when the key phase mark preset on the rotor under test passes through the probe position, the distance between the probe and the rotor under test is fixed;

[0049] Determine a plurality of reference positions of the rotor under test according to the pulse signal and the corresponding relationship between the preset reference position and the key phase mark;

[0050] Determine the trigger moment corresponding to each equal division according to the corresponding relationship between the preset reference position and the equal division and the rising edge moment of the corresponding pulse signal.

[0051] In one embodiment, the impedance measurement module is specifically configured to:

[0052] Scan at the trigger moment of each equal-division partition respectively to obtain the dynamic frequency-domain impedance diagrams of each equal-division partition of the rotor to be measured.

[0053] In one embodiment, the measuring device for the dynamic frequency-domain impedance of the generator rotor further includes a frequency band division module, which is used for:

[0054] Judge whether the passing time of the equal-division partition is less than the total measurement time;

[0055] If so, divide the scanning frequency band of the equal-division partition into multiple continuous frequency bands so that the measurement time of each frequency band is less than the passing time of the equal-division partition.

[0056] In one embodiment, the impedance measurement module is further used for:

[0057] Execute the scans of multiple frequency bands of the equal-division partition respectively at the trigger moment of the equal-division partition to obtain the dynamic frequency-domain impedance diagrams corresponding to each frequency band;

[0058] Perform splicing processing on the dynamic frequency-domain impedance diagrams of each frequency band to obtain the dynamic frequency-domain impedance diagram of the equal-division partition.

[0059] In a third aspect, the present application further provides an electronic device, including:

[0060] A central processing unit, a memory, and a communication module. A computer program is stored in the memory. The central processing unit can call the computer program. When the central processing unit executes the computer program, it implements any one of the measuring methods for the dynamic frequency-domain impedance of the generator rotor provided by the present application.

[0061] In a fourth aspect, the present application further provides a computer-readable storage medium for storing a computer program. When the computer program is executed by a processor, it implements any one of the measuring methods for the dynamic frequency-domain impedance of the generator rotor provided by the present application.

[0062] The measuring method and device for the dynamic frequency-domain impedance of the generator rotor of the present application select different scanning modes according to different rotor speeds, and achieve alignment in the rotor position according to the reference position during the sub-measurements, solving the problem of time-sharing in dynamic impedance testing; at the same time, the present application utilizes the repeatability of the rotor state during each rotation of the rotor, and adopts the methods of partition cyclic scanning and spectral segment splicing to achieve a complete spectral scan at different rotor positions, facilitating the use of spectral characteristics for inter-turn short-circuit diagnosis, and solving the coordination problem between the impedance scanning time and the rotor rotation period. Description of the Drawings

[0063] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0064] Figure 1 It is a schematic diagram of a method for measuring the dynamic frequency-domain impedance of a generator rotor provided by this application.

[0065] Figure 2 It is a schematic diagram of determining the rotational speed and reference position of the rotor to be measured provided by this application.

[0066] Figure 3 It is a schematic diagram of determining the scanning mode provided by this application.

[0067] Figure 4 It is another schematic diagram of a method for measuring the dynamic frequency-domain impedance of a generator rotor provided by this application.

[0068] Figure 5 It is another schematic diagram of a method for measuring the dynamic frequency-domain impedance of a generator rotor provided by this application.

[0069] Figure 6 It is another schematic diagram of a method for measuring the dynamic frequency-domain impedance of a generator rotor provided by this application.

[0070] Figure 7 and Figure 8 It is a schematic diagram of zone-based and frequency-band-based scanning provided by this application.

[0071] Figure 9 It is a schematic diagram of a device for measuring the dynamic frequency-domain impedance of a generator rotor provided by this application.

[0072] Figure 10 It is another schematic diagram of a device for measuring the dynamic frequency-domain impedance of a generator rotor provided by this application.

[0073] Figure 11 It is another schematic diagram of a device for measuring the dynamic frequency-domain impedance of a generator rotor provided by this application.

[0074] Figure 12 It is another schematic diagram of a device for measuring the dynamic frequency-domain impedance of a generator rotor provided by this application.

[0075] Figure 13 It is a schematic diagram of an electronic device provided by this application. Detailed implementation manners

[0076] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0077] In the first aspect, as Figure 1 shown, the present application provides a method for measuring the dynamic frequency-domain impedance of a generator rotor, including steps S101 to S104:

[0078] Step S101, measure the rotational speed and reference position of the rotor to be measured.

[0079] Specifically, regarding the measurement of the rotational speed, there are usually two methods: direct measurement and indirect measurement. Direct measurement is to directly observe the mechanical motion of the rotor to be measured, measure the number of rotations of the rotor within a specific time, so as to measure the rotational speed and position of the mechanical motion. Conventional methods include photoelectric code disk speed measurement method, stroboscopic speed measurement method, and key phase signal measurement method based on the Hall effect, etc.; Indirect measurement is to utilize the principle that the mechanical rotation of the rotor to be measured will cause changes in other physical quantities. First, measure these physical quantities, and then obtain the rotational speed according to the relationship between the changes of these physical quantities and the rotational speed, such as magnetic leakage speed measurement method, vibration speed measurement method, etc.

[0080] Regarding the determination of the reference position, generally speaking, a key phase mark, such as a groove or a protrusion, will be set on the shaft of the rotor. Even if there is no key phase mark on the rotor itself, we can temporarily stick a reflective strip on the shaft of the rotor, etc., as the key phase mark. The position where the key phase mark is located is the reference position referred to in the present application. This reference position is used as a reference point when the rotor rotates, for observing the rotation period and the number of rotations of the rotor. Further, the reference position combined with the rotation time of the rotor can determine the rotational speed and the rotation angle of the rotor.

[0081] Step S102, determine the scanning mode according to the rotational speed, where the scanning mode includes a single scan mode and a partition cyclic scan mode; the partition cyclic scan mode is realized by equally dividing the rotor to be measured into multiple sector regions and separately scanning each sector region in turn.

[0082] Specifically, when the rotational speed of the rotor exceeds a certain threshold and rotates at a high speed, it is considered that the centrifugal force of the rotor plays a major role, and the force on the rotor at different positions is unchanged and has nothing to do with the position (rotation angle) of the rotor, that is, the turn-to-turn short circuit is stable. At this time, when to start scanning and when to start another scan have little impact on determining the turn-to-turn short circuit of the rotor. Therefore, a conventional single scan can be performed according to the generally set scanning parameters.

[0083] When the rotational speed of the rotor is lower than a certain threshold and rotates at a low speed, the influence of gravity is greater. At this time, the force on the inter-turn short-circuit fault point is different at different positions during the rotation process, and there are situations where the force decreases, the insulation recovers, and the short-circuit point disappears. Therefore, it is necessary to scan the different positions of the rotor separately, that is, divide one week of the rotor into N equal parts, and consider that the force on the rotor is constant within a certain equal part, and the insulation state of the rotor is constant. According to the passing time T of the rotor in a certain equal part m Select scanning parameter information such as the scanning frequency range and the number of scanning points. Among them, it is advisable to divide one week of the rotor into 4 to 8 equal parts. If the number of parts is small, it cannot comprehensively diagnose each part of the rotor winding. If the number of parts is too large, it has high requirements for the measurement speed of the device, and it may not be able to complete the scanning of the predetermined frequency band within a limited distance for each segment.

[0084] Step S103, configure scanning parameters according to the reference position and the scanning mode.

[0085] Among them, the scanning parameters include conventional scanning parameters such as the scanning frequency range, the number of scanning points / fixed step frequency sweep parameters / fixed time interval frequency sweep parameters, the scanning level, and the scanning speed, as well as the scanning position determined according to the scanning mode.

[0086] For example, for the single scan mode, its scanning parameters can be set as the scanning frequency range of 1 kHz to 800 kHz, the number of scanning points of 800 points, the scanning level of 5 V, and the scanning speed of medium. The scanning position is the position where the key phase mark is located in step S101.

[0087] For the partitioned cyclic scan mode, its scanning parameters can be set as the scanning frequency range of 1 kHz to 800 kHz, the number of scanning points of 800 points, the scanning level of 5 V, and the scanning speed of medium. The scanning position (rotation angle) is determined according to the reference position in step S101 and the rotation time of the rotor.

[0088] Step S104, scan the rotor to be measured according to the scanning parameters to obtain the dynamic frequency domain impedance of the rotor to be measured.

[0089] Specifically, scan the rotor to be measured point by point according to the corresponding scanning parameters to obtain the dynamic frequency domain impedance of the rotor to be measured. Among them, the scanned dynamic frequency domain impedance can be displayed to the staff in the form of a chart in real time.

[0090] The measurement method of the dynamic frequency domain impedance of the generator rotor in this application selects different scanning modes according to the different rotational speeds of the rotor, and realizes the alignment of the rotor positions according to the reference position during the divided measurements, solving the problem of the time-sharing of the dynamic impedance test.

[0091] In one embodiment, taking the key-phase signal measurement method based on the Hall effect as an example, the steps of measuring the rotational speed and reference position of the rotor to be measured are described in detail. At this time, only one key-phase mark is preset on the rotor to be measured. As Figure 2 shown, the measurement steps specifically include:

[0092] Step S1011, collect the pulse signal when the preset key-phase mark on the rotor to be measured passes through the probe position, and the distance between the probe and the rotor to be measured is fixed;

[0093] Step S1012, determine the reference position of the rotor to be measured according to the rising edge time of the pulse signal.

[0094] Specifically, during the rotation of the rotor, when the key-phase mark rotates through the probe position, due to the sudden change in the distance between the probe and the measured surface, a pulse signal will be generated. In other words, at the rising edge time of the pulse signal, the key-phase mark is directly opposite to the probe.

[0095] Step S1013, determine the rotational speed of the rotor to be measured according to the acquisition time and the number of pulse signals acquired within the acquisition time.

[0096] Specifically, the time interval between two adjacent pulse rising edges is the time interval for the key-phase mark of the rotor to reach the probe position continuously twice, that is, the time required for the rotor to rotate one week. Therefore, assuming that N pulses are continuously acquired, and the time interval between the rising edge time of the first pulse and the rising edge time of the last pulse among these N pulses is T seconds, the rotational speed of the rotor to be measured can be calculated by the following formula:

[0097]

[0098] where n is the rotational speed, unit: revolutions per minute (r / min); N is the number of pulses acquired, unit: piece; T is the acquisition time, unit: second (s).

[0099] Further, after determining the reference position and rotational speed, the rotation period t = 1 / n of the rotor can be calculated according to the rotational speed; furthermore, the rotation angle of the rotor can be determined. For example, assuming that the rotor rotates at a constant speed, within t / 8 seconds after detecting the pulse signal, the rotor rotates 45° from the key-phase mark.

[0100] The present application also provides another speed measurement method, that is, a speed measurement gear synchronized with the rotor to be measured is set. When the teeth evenly distributed in the circumferential direction of the speed measurement gear rotate through the probe, due to the sudden change in the distance between the probe and the measured surface, a continuous pulse sequence will be generated. At this time, the rotational speed of the rotor to be measured can be determined according to the frequency of the pulses in the pulse sequence and the number of teeth distributed on the speed measurement gear. However, since the pulse signals corresponding to all positions of the speed measurement gear are the same, this method cannot be used to determine the reference position.

[0101] Those skilled in the art should understand that this embodiment only provides two feasible examples for measuring the rotational speed and the reference position, and does not limit that the present application can only use the key-phase signal measurement method based on the Hall effect or the speed measurement gear speed measurement method to measure the rotational speed.

[0102] In one embodiment, as Figure 3 shown, the determining the scanning mode according to the rotational speed includes:

[0103] Detecting whether the rotational speed exceeds a preset threshold. If so, determining the scanning mode as a single scan mode;

[0104] If not, determining the scanning mode as a partitioned cyclic scanning mode.

[0105] In one embodiment, as Figure 4 shown, when the scanning mode is a partitioned cyclic scanning mode and only one key-phase mark is preset on the rotor to be measured, step S103, configuring scanning parameters according to the reference position and the scanning mode, includes:

[0106] Step S1031, obtaining the number of equal partitions of the rotor to be measured in the partitioned cyclic scanning mode. In this embodiment, the following will take the example of dividing the rotor to be measured into 8 equal partitions for illustration.

[0107] Step S1032, determining the passing time of each equal partition according to the number of equal partitions and the rotational speed.

[0108] Specifically, if the rotational speed of the rotor to be measured measured in step S101 is n, then the rotation period t of the rotor to be measured = 1 / n. Assuming that the rotor to be measured rotates at a constant speed and the number of equal partitions is 8, then the passing time of each equal partition is

[0109]

[0110] where t is the rotation period of the rotor to be measured, unit: second (s).

[0111] Step S1033, respectively determining the trigger moment corresponding to each equal partition according to the reference position and the passing time.

[0112] Specifically, assuming that the position where the key-phase mark of the rotor to be measured is located (i.e., the reference position) is the starting point, and the equal partitions 1, 2, 3, 4, 5, 6, 7, and 8 are in turn along the reverse direction of the rotation direction of the rotor to be measured, as Figure 7 shown. Based on the principle described in step S1012, at the moment when the first pulse rising edge detected by the probe, the rotation angle of the rotor to be measured is as Figure 6As shown, after t / 8 seconds, the rotation angle of the rotor under test is as Figure 8 shown... and so on. Thus, it can be known that assuming the first pulse rising edge detected by the probe is set at 0 seconds, the trigger times of the 8 equal - partition zones are 0 seconds, t / 8 seconds, t / 4 seconds, 3t / 8 seconds, t / 2 seconds, 5t / 8 seconds, 3t / 4 seconds, 7t / 8 seconds, and t seconds respectively. The schematic diagram of the trigger times of each partition of the rotor under test can be seen in Figure 7 .

[0113] It can be understood that the trigger times of each partition of the rotor under test and the rotation angle of the rotor under test (relative to the reference position) are in one - to - one correspondence.

[0114] In an embodiment, when the scanning mode is the partition - loop scanning mode, and corresponding key - phase marks are preset on each equal - partition zone of the rotor under test, configuring the scanning parameters according to the reference position and the scanning mode includes:

[0115] Collecting the pulse signal when the key - phase mark preset on the rotor under test passes through the probe position, the distance between the probe and the rotor under test is fixed;

[0116] Determining multiple reference positions of the rotor under test according to the pulse signal and the corresponding relationship between the preset reference position and the key - phase mark; wherein, the key - phase marks corresponding to each equal - partition zone are different. For example, convex keys with different heights can be set respectively. Using the principle that the amplitudes of the pulse signals corresponding to the convex keys with different heights are different, the key - phase mark corresponding to the pulse signal is determined, and then different reference positions of the rotor under test are distinguished according to the key - phase mark;

[0117] Determining the trigger time corresponding to each equal - partition zone according to the corresponding relationship between the preset reference position and the equal - partition zone and the rising - edge time of the corresponding pulse signal. Among them, the rising - edge time of the pulse signal is the trigger time of the corresponding equal - partition zone.

[0118] In the previous embodiment, only one key - phase mark is preset on the rotor under test, and the position where the key - phase mark is located is used as the starting point of each rotation period of the rotor under test, that is, the reference position. According to this reference position and the passing time of each equal - partition zone, the starting position and trigger time of each equal - partition zone on the rotor under test are determined. However, the accuracy of this method is not high enough.

[0119] Therefore, this embodiment provides another method for determining the trigger moment, that is, key phase marks are preset at the starting positions of each equal-division partition in advance, and each key phase mark is different. Then, a probe is used to collect the pulse signal during the rotation of the rotor to be measured. Since each key phase mark is different, the corresponding equal-division partition can be uniquely determined according to the characteristics of the pulse signal, and the rising edge moment of the pulse signal is the trigger moment corresponding to the equal-division partition. Compared with the previous embodiment, the method for determining the trigger moments of each equal-division partition in this embodiment is more accurate, and the measurement result is also more accurate.

[0120] In one embodiment, after determining the trigger moments of each equal-division partition of the rotor to be measured, step S104 is to scan the rotor to be measured according to the scanning parameters to obtain the dynamic frequency-domain impedance of the rotor to be measured, specifically:

[0121] Scan each equal-division partition according to the scanning parameters at the trigger moment of each equal-division partition to obtain the dynamic frequency-domain impedance diagram of the corresponding equal-division partition of the rotor to be measured.

[0122] It can be seen that the scanning results obtained by the partition cyclic scanning are the dynamic frequency-domain impedance diagrams corresponding to each equal-division partition of the rotor to be measured. The dynamic frequency-domain impedance diagrams of each equal-division partition can be independently applied to the fault detection of the generator rotor. If it is measured that there is an inter-turn short circuit according to the dynamic frequency-domain impedance corresponding to a certain equal-division partition, it is considered that there is an inter-turn short circuit fault in the generator rotor.

[0123] In one embodiment, as Figure 5 shown, when the scanning mode is the partition cyclic scanning mode, the method for measuring the dynamic frequency-domain impedance of the generator rotor further includes:

[0124] Judge whether the passing time of the equal-division partition is less than the total measurement time;

[0125] If so, divide the scanning frequency band of the equal-division partition into multiple continuous frequency bands so that the measurement time of each frequency band is less than the passing time of the equal-division partition.

[0126] Specifically, continuing with Figure 4 the example in the corresponding embodiment, the rotor to be measured is divided into 8 equal-division partitions in total, and the rotation period of the rotor to be measured is t, then the passing time of each equal-division partition The total measurement time refers to the total time for waveform formation, operation, and data image processing for an equal-division partition, and the total measurement time is

[0127] T e = x×A + B + C

[0128] Among them, A is the time for analog measurement signal, that is, the time required to form pulse waveforms of different frequencies, and the formation times corresponding to different frequencies of the pulse waveforms are different; B is the operation time, and different scanning speeds correspond to different operation times; C is the data image processing time, which mainly includes the time for instrument interface image display, the time for the memory to save data, and the compensation time for open circuit and short circuit, etc.; x is the number of scanning points (for example, 800).

[0129] When the passing time T of the equal - partition area m is less than the total measurement time T e , within the passing time T m , a complete spectrum cannot be measured. At this time, it is necessary to reduce the total measurement time T e . According to the calculation formula of T e , T e is related to the parameters x, A, B, and C. Therefore, the operation time B can be shortened by increasing the scanning speed of the impedance measurement device, and / or the data image processing time C can be shortened by reducing the average number of scans to reduce T e . The above two methods can be quickly realized by adjusting the parameters of the impedance measurement device. When the requirements of T e <T m still cannot be met after parameter adjustment, the product of x and A can also be reduced by reducing the number of scanning points x to reduce T e .

[0130] This embodiment focuses on explaining the method of reducing T e by reducing the number of scanning points x. Specifically, the scanning frequency range is divided into multiple consecutive frequency bands, for example, Y frequency bands, and these frequency bands can be equally divided or not equally divided. For this equal - partition area, only one frequency band is scanned at a time. Since the number of scanning points in each frequency band is reduced, the total measurement time of each frequency band will also be shortened, thereby meeting T e <T m .

[0131] At this time, in step S104, the rotor to be measured is scanned according to the scanning parameters. As Figure 6 shown, obtaining the dynamic frequency - domain impedance of the rotor to be measured further includes:

[0132] Step S1041, at the trigger moments of the equal - partition area, scans of multiple frequency bands of the equal - partition area are respectively performed to obtain the dynamic frequency - domain impedance diagrams corresponding to each frequency band;

[0133] Step S1042, the dynamic frequency - domain impedance diagrams of each frequency band are spliced to obtain the dynamic frequency - domain impedance diagram of the equal - partition area.

[0134] Based on the repeatability of the rotor state in each rotation, scans of different frequency bands are triggered respectively at the start of each equal - division partition until the scans of Y frequency bands are all completed. Then, the frequency spectra corresponding to the Y frequency bands are sequentially spliced to form a complete dynamic frequency - domain impedance map corresponding to this equal - division partition.

[0135] The following will illustrate the process of partition scanning and frequency - band division of the scanning frequency range in this application through a specific example. In practical applications, dedicated impedance measurement equipment such as an impedance analyzer can be used to perform dynamic frequency - domain impedance scans.

[0136] Refer to Figure 7 and Figure 8 the partition schematic diagram of the rotor to be measured shown. The rotor to be measured is evenly divided into X equal parts. Here, an example of 8 equal parts is taken. Assume that the rotation period of the rotor to be measured is t seconds. Then, the time taken for the rotor to rotate 45° is t / 8 seconds, so T m = t / 8. When the total measurement time T e of a certain equal - division partition is greater than the passing time T m of this equal - division partition, the scanning frequency range needs to be divided into Y frequency bands. Here, an example of three frequency bands is taken, namely 1 kHz - 300 kHz, 300 kHz - 600 kHz, and 600 kHz - 800 kHz, so that the total measurement time T e during the scan of each frequency band is less than the passing time T m of this equal - division partition.

[0137] When scanning equal - division partition 1, refer to Figure 7 . When the impedance analyzer receives the first pulse signal, it immediately triggers a scan and tests according to the sweep frequency range of the low - frequency band 200 kHz - 300 kHz; when it receives the second pulse signal, it scans according to the sweep frequency range of the middle - frequency band 300 kHz - 600 kHz; similarly, when it receives the third pulse signal, it scans according to the sweep frequency range of the high - frequency band (600 kHz - 800 kHz). After the scan is completed, the waveforms of the three times are integrated into a complete waveform for storage and display.

[0138] Then, scan equal - division partition 2, refer to Figure 8 . When receiving the first pulse signal, trigger a scan after a delay of t / 8 seconds and scan according to the sweep frequency range of the low - frequency band 200 kHz - 300 kHz; when receiving the second pulse signal, trigger a scan after a delay of t / 8 seconds and scan according to the sweep frequency range of the middle - frequency band 300 kHz - 600 kHz; similarly, when receiving the third pulse signal, trigger a scan after a delay of t / 8 seconds and scan according to the sweep frequency range of the high - frequency band 600 kHz - 800 kHz. After the scan is completed, the waveforms of the three times are integrated into a complete waveform for storage and display.

[0139] The scanning processes of equal-division partitions 3 to 8 are similar to the aforementioned process, with the only difference being the delay time for receiving the pulse signal. When measuring equal-division partition y, it is only necessary to delay for (y - 1)*t / 8 seconds, where y is the number of the equal-division partition. For each full rotation of the rotor, the impedance spectra of the first frequency band corresponding to 8 equal-division partitions can be obtained. In the second rotation, the impedance spectra of the first frequency band corresponding to 8 equal-division partitions are obtained... until the spectra of all frequency bands of all equal-division partitions are completely scanned.

[0140] In summary, this application utilizes the repeatability of the rotor state during each full rotation of the rotor, and adopts the methods of partition cyclic scanning and spectral segment splicing to achieve a complete spectral scan of the rotor at different positions, which is convenient for diagnosing turn-to-turn short circuits using spectral characteristics, and solves the coordination problem between the impedance scanning time and the rotor rotation period.

[0141] In addition, regarding the scanning device applicable to this application, an example here is an impedance analyzer. The impedance analyzer is used to measure the change of complex impedance with frequency, and the measurement methods can select conventional methods such as current-voltage measurement, automatic balance bridge measurement, and radio frequency current-voltage measurement.

[0142] The impedance measurement parameter configuration mainly includes:

[0143] a. Trigger mode setting: The trigger mode that can be set should include but is not limited to single scan and cyclic scan;

[0144] Among them, the single scan is (that is, when receiving the trigger (key phase pulse) signal, immediately perform a scan measurement according to the configured parameters),

[0145] The cyclic scan is (that is, according to the key phase signal, repeat the scan of different positions of the rotor through time delay according to the scan parameters)

[0146] b. Scanning frequency range (bandwidth) setting: The scanning frequency range that can be set should include but is not limited to fixed-range frequency sweep (setting the start frequency and cut-off frequency, and automatically calculating each scan point according to the number of scan points); fixed-step frequency sweep (setting the start frequency of the scan and the step of the scan point, and automatically calculating each scan point according to the number of scan points); fixed-time interval frequency sweep (performing scans at a certain time interval with fixed scan parameters);

[0147] c. Measurement signal setting: If the scan parameter of the impedance measurement module is frequency, the measurement voltage and measurement current in the measurement signal can be set separately.

[0148] d. Measurement speed setting: The lower the measurement speed, the higher the test accuracy. The factors affecting the measurement speed include operation time, measurement mode, compensation mode data storage, screen display, etc., and comprehensive consideration should be given to ensure the accuracy, stability, and dynamic performance of the excitation source frequency.

[0149] In addition to the conventional functions of the above impedance measurement module, the impedance measurement module applicable to the frequency-domain impedance measurement equipment for generator rotor inter-turn short circuit shall have the following characteristics:

[0150] 1) The bandwidth of the impedance measurement module shall cover 1 MHz, but shall not be too large: The input impedance characteristic of the rotor winding is an oscillating and decaying characteristic. The impedance in the low-frequency band is relatively large, while the impedance in the high-frequency band is very small, ranging from several ohms to several hundred ohms approximately. In addition, due to the existence of the ground capacitance effect of the generator rotor, there is a cut-off frequency in the rotor winding spectrum, and too high-frequency signals cannot be injected into the winding. This frequency is basically within 1 MHz, and the power shall be able to meet the impedance test requirements within 1 MHz;

[0151] 2) The measurement voltage of the impedance measurement module is preferably set to 5 V:. The impedance test voltage is limited by the instrument power. Usually, the voltage is set within 10 V. If the voltage is too high, the load is large in the high-frequency band and the voltage is too high to be output; if the voltage is too low, the measured current value is very small, and the minimum current measurement sensitivity requirement is high, which may lead to a decrease in measurement accuracy. Generally, it is more appropriate to select a 5 V voltage;

[0152] 3) The sweep frequency interval shall not be too small: The spectrum change caused by the inter-turn short circuit is an overall fluctuating change, rather than a local impedance mutation. Therefore, the frequency interval does not need to be particularly small, and generally 1 kHz is sufficient;

[0153] 4) The voltage and current measurements shall ensure sufficient accuracy within the full frequency range. The reasons affecting the accuracy are related to factors such as measurement speed, measurement level, measurement temperature, compensation coefficient, etc., and should be comprehensively considered;

[0154] 5) Each frequency point shall be able to be measured quickly and independently to prevent signal aliasing at different frequencies.

[0155] Based on the same inventive concept, the embodiment of the present application also provides a measurement device for the dynamic frequency-domain impedance of a generator rotor, which can be used to implement the method described in the above embodiment, as described in the following embodiment. Since the principle of solving the problem of the measurement device for the dynamic frequency-domain impedance of a generator rotor is similar to that of the measurement method for the dynamic frequency-domain impedance of a generator rotor, the implementation of the measurement device for the dynamic frequency-domain impedance of a generator rotor can refer to the implementation of the measurement method for the dynamic frequency-domain impedance of a generator rotor, and the repeated parts will not be elaborated. Hereinafter, the term "unit" or "module" may be a combination of software and / or hardware that can implement a predetermined function. Although the system described in the following embodiments is preferably implemented in software, the implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0156] As Figure 9 shown, the present application provides a measurement device for the dynamic frequency-domain impedance of a generator rotor, including:

[0157] The rotational speed determination module 201 is configured to measure the rotational speed and the reference position of the rotor to be measured;

[0158] The scan mode determination module 202 is configured to determine the scan mode according to the rotational speed, where the scan mode includes a single scan mode and a partitioned cyclic scan mode; the partitioned cyclic scan mode is achieved by equally dividing the rotor to be measured into multiple sector regions and separately scanning each sector region in sequence;

[0159] The scan parameter determination module 203 is configured to configure scan parameters according to the reference position and the scan mode;

[0160] The impedance measurement module 204 is configured to scan the rotor to be measured according to the scan parameters to obtain the dynamic frequency-domain impedance of the rotor to be measured.

[0161] In one embodiment, as Figure 10 shown, the rotational speed determination module 201 includes:

[0162] The reference position determination unit 2021 is configured to, when only one key-phase mark is preset on the rotor to be measured, collect the pulse signal when the preset key-phase mark on the rotor to be measured passes through the probe position, where the distance between the probe and the rotor to be measured is fixed; and determine the reference position of the rotor to be measured according to the moment when the rising edge of the pulse signal is generated;

[0163] The rotational speed determination unit 2022 is configured to determine the rotational speed of the rotor to be measured according to the collection time and the number of pulse signals collected within the collection time.

[0164] In one embodiment, the scan mode determination module 202 is specifically configured to:

[0165] Detect whether the rotational speed exceeds a preset threshold. If so, determine the scan mode as the single scan mode;

[0166] If not, determine the scan mode as the partitioned cyclic scan mode.

[0167] In one embodiment, as Figure 11 shown, the scan parameter determination module 203 includes:

[0168] The equal-division partition number determination unit 2031 is configured to, when the scan mode is the partitioned cyclic scan mode, obtain the equal-division partition number of the rotor to be measured in the partitioned cyclic scan mode;

[0169] The passing time determination unit 2032 is configured to determine the passing time of each equal-division partition according to the equal-division partition number and the rotational speed; and

[0170] The trigger time determination unit 2033 is configured to determine the trigger time corresponding to each equal-division partition according to the reference position and the passing time respectively.

[0171] In an embodiment, the reference position determination unit is further configured to: when the scanning mode is a partition cyclic scanning mode, and key-phase marks are preset on each equal-division partition of the rotor to be measured, collect pulse signals when the preset key-phase marks on the rotor to be measured pass through the probe position, where the distance between the probe and the rotor to be measured is fixed;

[0172] The scanning parameter determination module is further configured to: determine a plurality of reference positions of the rotor to be measured according to the pulse signals and the corresponding relationship between the preset reference position and the key-phase marks; and determine the trigger time corresponding to each equal-division partition according to the corresponding relationship between the preset reference position and the equal-division partitions and the rising edge time of the corresponding pulse signals.

[0173] In an embodiment, the impedance measurement module 204 is specifically configured to:

[0174] Perform scans at the trigger time of each equal-division partition respectively to obtain the dynamic frequency-domain impedance diagrams of each equal-division partition of the rotor to be measured.

[0175] In an embodiment, as Figure 12 shown, the measuring device for the dynamic frequency-domain impedance of the generator rotor further includes a frequency band division module 205, which is configured to:

[0176] Judge whether the passing time of the equal-division partition is less than the total measurement time;

[0177] If so, divide the scanning frequency band of the equal-division partition into a plurality of continuous frequency bands, so that the measurement time of each frequency band is less than the passing time of the equal-division partition.

[0178] In an embodiment, the impedance measurement module 204 is further configured to:

[0179] Perform scans of the multiple frequency bands of the equal-division partition at the trigger time of the equal-division partition respectively to obtain the dynamic frequency-domain impedance diagrams corresponding to each frequency band;

[0180] Perform splicing processing on the dynamic frequency-domain impedance diagrams of each frequency band to obtain the dynamic frequency-domain impedance diagram of the equal-division partition.

[0181] The measuring device for the dynamic frequency-domain impedance of the generator rotor in this application selects different scanning modes according to different rotor speeds, and achieves alignment in the rotor position according to the reference position during the divided measurements, solving the problem of time-sharing in dynamic impedance testing. At the same time, this application utilizes the repeatability of the rotor state during each rotation of the rotor, and adopts the method of sectional cyclic scanning and spectrum segmentation splicing to achieve a complete spectrum scan at different positions of the rotor, facilitating the diagnosis of turn-to-turn short circuits using spectrum characteristics, and solving the coordination problem between the impedance scanning time and the rotor rotation period.

[0182] The present invention also provides an electronic device. Refer to Figure 13 , the electronic device 100 specifically includes:

[0183] A central processor 110, a memory 120, a communication module 130, an input unit 140, an output unit 150, and a power supply 160.

[0184] Among them, the memory 120, the communication module 130, the input unit 140, the output unit 150, and the power supply 160 are respectively connected to the central processor 110. A computer program is stored in the memory 120, and the central processor 110 can call the computer program. When the central processor 110 executes the computer program, all steps in the measuring method for the dynamic frequency-domain impedance of the generator rotor in the above embodiment are realized.

[0185] An embodiment of this application also provides a computer-readable storage medium for storing a computer program, which can be executed by a processor. When the computer program is executed by the processor, any measuring method for the dynamic frequency-domain impedance of the generator rotor provided by the present invention is realized.

[0186] Those skilled in the art should understand that the embodiments of this specification can be provided as methods, systems, or computer program products. Therefore, the embodiments of this specification can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the embodiments of this specification can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The embodiments in this specification are described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments. In particular, for the system embodiments, since they are basically similar to the method embodiments, the description is relatively simple. For the relevant parts, reference can be made to the partial description of the method embodiments. In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of this specification.

[0187] In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. The above is only the embodiments of the embodiments of this specification and is not used to limit the embodiments of this specification. For those skilled in the art, various changes and modifications can be made to the embodiments of this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the embodiments of this specification shall be included within the scope of the claims of the embodiments of this specification.

Claims

1. A method for measuring the dynamic frequency-domain impedance of a generator rotor, characterized in that, Including: Measuring the reference position and rotational speed of the rotor to be measured; Determining a scanning mode according to the rotational speed, where the scanning mode includes a single-scan mode and a partitioned cyclic scanning mode; The partitioned cyclic scanning mode is achieved by equally dividing the rotor to be measured into multiple sector regions and separately scanning each sector region in sequence; Configuring scanning parameters according to the reference position and the scanning mode; Scanning the rotor to be measured according to the scanning parameters to obtain the dynamic frequency-domain impedance of the rotor to be measured; Wherein, the determining the scanning mode according to the rotational speed includes: Detecting whether the rotational speed exceeds a preset threshold. If so, determining the scanning mode as the single-scan mode; If not, determining the scanning mode as the partitioned cyclic scanning mode; Wherein, when the scanning mode is the partitioned cyclic scanning mode, the method for measuring the dynamic frequency-domain impedance of the generator rotor further includes: Judging whether the passing time of the equal division is less than the total measurement time; If so, dividing the scanning frequency band of the equal division into multiple continuous frequency bands such that the measurement time of each frequency band is less than the passing time of the equal division; Wherein, the scanning the rotor to be measured according to the scanning parameters to obtain the dynamic frequency-domain impedance of the rotor to be measured includes: Performing scans of multiple frequency bands of the equal division at the trigger moments of the equal division respectively to obtain dynamic frequency-domain impedance diagrams corresponding to each frequency band; Performing a splicing process on the dynamic frequency-domain impedance diagrams of each frequency band to obtain the dynamic frequency-domain impedance diagram of the equal division.

2. The method for measuring the dynamic frequency-domain impedance of a generator rotor according to claim 1, characterized in that When only one key-phase mark is preset on the rotor to be measured, the measuring the reference position and rotational speed of the rotor to be measured includes: Collecting a pulse signal when the preset key-phase mark on the rotor to be measured passes through the probe position, where the distance between the probe and the rotor to be measured is fixed; Determining the reference position of the rotor to be measured according to the moment when the rising edge of the pulse signal occurs; and Determining the rotational speed of the rotor to be measured according to the acquisition time and the number of pulse signals acquired within the acquisition time.

3. The measurement method of the dynamic frequency-domain impedance of a generator rotor according to claim 2, characterized in that When the scanning mode is the partitioned cyclic scanning mode, the configuring the scanning parameters according to the reference position and the scanning mode includes: Obtaining the number of equal divisions of the rotor to be measured in the partitioned cyclic scanning mode; Determining the passing time of each equal division according to the number of equal divisions and the rotational speed; and Respectively determining the trigger moment corresponding to each equal division according to the reference position and the passing time.

4. The method for measuring the dynamic frequency-domain impedance of a generator rotor according to claim 1, characterized in that, When the scanning mode is the partitioned cyclic scanning mode and corresponding key-phase marks are preset on each equal division of the rotor to be measured, the configuring the scanning parameters according to the reference position and the scanning mode includes: Collecting a pulse signal when the preset key-phase mark on the rotor to be measured passes through the probe position, where the distance between the probe and the rotor to be measured is fixed; Determining multiple reference positions of the rotor to be measured according to the pulse signal and the corresponding relationship between the preset reference position and the key-phase mark; Determining the trigger moment corresponding to each equal division according to the corresponding relationship between the preset reference position and the equal division and the rising edge moment of the corresponding pulse signal.

5. The method for measuring the dynamic frequency-domain impedance of a generator rotor according to claim 3 or 4, characterized in that The scanning the rotor to be measured according to the scanning parameters to obtain the dynamic frequency-domain impedance of the rotor to be measured includes: Scanning is performed at the triggering moment of each equal-division partition to obtain the dynamic frequency-domain impedance diagrams of each equal-division partition of the rotor to be measured.

6. A measuring device for the dynamic frequency-domain impedance of a generator rotor, characterized in that, Including: A rotational speed determination module for measuring the rotational speed and reference position of the rotor to be measured; A scanning mode determination module for determining the scanning mode according to the rotational speed, the scanning mode including a single-scan mode and a partition cyclic scanning mode; the partition cyclic scanning mode is realized by equally dividing the rotor to be measured into a plurality of fan-shaped regions and separately scanning each fan-shaped region in sequence; A scanning parameter determination module for configuring scanning parameters according to the reference position and the scanning mode; An impedance measurement module for scanning the rotor to be measured according to the scanning parameters to obtain the dynamic frequency-domain impedance of the rotor to be measured; Among them, the scanning mode determination module is specifically used for: Detecting whether the rotational speed exceeds a preset threshold, and if so, determining the scanning mode as the single-scan mode; If not, determining the scanning mode as the partition cyclic scanning mode; Among them, when the scanning mode is the partition cyclic scanning mode, the measuring device for the dynamic frequency-domain impedance of the generator rotor further includes a frequency band division module for: judging whether the passing time of the equal-division partition is less than the total measurement time; if so, dividing the scanning frequency band of the equal-division partition into a plurality of continuous frequency bands so that the measurement time of each frequency band is less than the passing time of the equal-division partition; Among them, the impedance measurement module is further used for: performing scans of a plurality of frequency bands of the equal-division partition at the triggering moment of the equal-division partition to obtain the dynamic frequency-domain impedance diagrams corresponding to each frequency band; splicing the dynamic frequency-domain impedance diagrams of each frequency band to obtain the dynamic frequency-domain impedance diagram of the equal-division partition.

7. The measuring device for the dynamic frequency-domain impedance of a generator rotor according to claim 6, wherein The rotational speed determination module includes: A reference position determination unit for, when only one key-phase mark is preset on the rotor to be measured, collecting the pulse signal when the preset key-phase mark on the rotor to be measured passes through the probe position, the distance between the probe and the rotor to be measured being fixed; and determining the reference position of the rotor to be measured according to the moment when the rising edge of the pulse signal occurs; A rotational speed determination unit for determining the rotational speed of the rotor to be measured according to the acquisition time and the number of pulse signals acquired within the acquisition time.

8. The measuring device for the dynamic frequency-domain impedance of a generator rotor according to claim 7, characterized in that, The scanning parameter determination module includes: An equal-division partition number determination unit for, when the scanning mode is the partition cyclic scanning mode, obtaining the number of equal-division partitions of the rotor to be measured in the partition cyclic scanning mode; A passing time determination unit for determining the passing time of each equal-division partition according to the number of equal-division partitions and the rotational speed; and A triggering moment determination unit for respectively determining the triggering moment corresponding to each equal-division partition according to the reference position and the passing time.

9. The measuring device for the dynamic frequency-domain impedance of a generator rotor according to claim 6, characterized in that, The reference position determination unit is further used for: when the scanning mode is the partition cyclic scanning mode and corresponding key-phase marks are preset on each equal-division partition of the rotor to be measured, collecting the pulse signal when the preset key-phase mark on the rotor to be measured passes through the probe position, the distance between the probe and the rotor to be measured being fixed; The scanning parameter determination module is further used for: determining a plurality of reference positions of the rotor to be measured according to the pulse signal and the corresponding relationship between the preset reference position and the key-phase mark; Determine the trigger time corresponding to each equal - division partition according to the correspondence between the preset reference position and the equal - division partition and the rising - edge moment of the corresponding pulse signal.

10. The measuring device for the dynamic frequency-domain impedance of a generator rotor according to claim 8 or 9, characterized in that, The impedance measurement module is specifically configured to: Perform scans respectively at the trigger times of each equal - division partition to obtain the dynamic frequency - domain impedance diagrams of each equal - division partition of the rotor to be measured.

11. An electronic device, characterized in that, Comprising: A central processing unit, a memory, and a communication module. A computer program is stored in the memory. The central processing unit can call the computer program. When the central processing unit executes the computer program, the method for measuring the dynamic frequency - domain impedance of the generator rotor as described in any one of claims 1 to 5 is implemented.

12. A computer-readable storage medium for storing a computer program, characterized in that, When the computer program is executed by a processor, the method for measuring the dynamic frequency - domain impedance of the generator rotor as described in any one of claims 1 to 5 is implemented.

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