CN113960470A - Method and device for detecting shaft current of generator - Google Patents
Method and device for detecting shaft current of generator Download PDFInfo
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- CN113960470A CN113960470A CN202110972444.1A CN202110972444A CN113960470A CN 113960470 A CN113960470 A CN 113960470A CN 202110972444 A CN202110972444 A CN 202110972444A CN 113960470 A CN113960470 A CN 113960470A
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- 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
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Abstract
A method and apparatus for detecting shaft current of generator are provided. The detection method comprises the following steps: detecting whether a magnetic field meeting preset conditions exists around a bearing of the generator; determining that the generator generates a shaft current when a magnetic field satisfying a preset condition exists; wherein the preset conditions include: the frequency of the magnetic field signal is within a particular frequency range.
Description
Technical Field
The present disclosure relates generally to the field of generator technologies, and more particularly, to a method and an apparatus for detecting a shaft current of a generator.
Background
During the rotation of the generator, the pulsating magnetic flux induces a shaft voltage, which is the voltage induced in a loop formed by the shaft, the bearing and the casing. When a shaft voltage is generated across the shaft of the generator, if the bearings on both sides of the shaft are in direct contact with the casing to form a closed loop, a current is generated, which is the shaft current. Under normal conditions, a lubricating oil film exists between the rotating shaft and the bearing, and the insulating effect is achieved. For lower shaft voltage, the lubricating oil film can still protect the insulating property and cannot generate shaft current. However, when the shaft voltage increases to a certain value, especially when the generator is started, the lubricating oil film in the bearing is not formed stably, and the shaft voltage can break through the oil film to discharge, so that a loop is formed, and various damage accidents are further generated. The harm of shaft current is mainly that small electric arc erosion will be generated between a shaft neck and a bearing bush, an oil film is damaged, the temperature of a bearing is increased, and lubricating oil is carbonized and deteriorated; if the shaft current exceeds a certain value, the sliding surfaces of the shaft journals and bearing shoes of the generator may be damaged, resulting in the bearing being unusable or having a significantly shortened life. Therefore, a fast and accurate detection of the shaft current is essential.
Disclosure of Invention
An exemplary embodiment of the present disclosure is to provide a method and an apparatus for detecting a shaft current of a generator, which can detect whether a shaft current is generated by the generator conveniently, in real time, and accurately.
According to an exemplary embodiment of the present disclosure, there is provided a detection method of a generator shaft current, the detection method including: detecting whether a magnetic field meeting preset conditions exists around a bearing of the generator; determining that the generator generates a shaft current when a magnetic field satisfying a preset condition exists; wherein the preset conditions include: the frequency of the magnetic field signal is within a particular frequency range.
Optionally, the preset condition further includes: the magnetic field occurs at a frequency that is an integer multiple of the frequency of the generator speed.
Optionally, the detecting whether a magnetic field meeting a preset condition exists around a bearing of the generator includes: receiving a frequency spectrum signal of a high-frequency magnetic field signal around a bearing of the generator collected from the near-field induction device; analyzing the frequency spectrum signal to obtain the frequency of the high-frequency magnetic field signal; determining whether a frequency of the high-frequency magnetic field signal is within a specific frequency range; determining that a magnetic field satisfying a preset condition exists when the frequency of the high-frequency magnetic field signal is within a specific frequency range.
Optionally, the detecting whether a magnetic field meeting a preset condition exists around a bearing of the generator includes: receiving a frequency spectrum signal of a high-frequency magnetic field signal around a bearing of the generator collected from the near-field induction device; analyzing the frequency spectrum signal to obtain the frequency of the high-frequency magnetic field signal and the frequency of the high-frequency magnetic field signal; receiving a rotating speed frequency spectrum signal of the collected generator rotating speed signal from the near-field induction equipment; analyzing the rotating speed frequency spectrum signal to obtain the frequency of the rotating speed signal of the generator; determining whether a frequency of the high-frequency magnetic field signal is within a specific frequency range and whether a frequency at which the high-frequency magnetic field signal appears is an integer multiple of a frequency of the generator rotational speed signal; and when the frequency of the high-frequency magnetic field signal is in a specific frequency range and the frequency of the high-frequency magnetic field signal is an integral multiple of the frequency of the generator rotating speed signal, determining that a magnetic field meeting a preset condition exists.
Optionally, the specific frequency range is 1MHz to 500 MHz.
According to an exemplary embodiment of the present disclosure, there is provided a detection device of a generator shaft current, the detection device including: a test device configured to perform the following operations: detecting whether a magnetic field meeting preset conditions exists around a bearing of the generator; determining that the generator generates a shaft current when a magnetic field satisfying a preset condition exists; wherein the preset conditions include: the frequency of the magnetic field signal is within a particular frequency range.
Optionally, the preset condition further includes: the magnetic field occurs at a frequency that is an integer multiple of the frequency of the generator speed.
Optionally, the detection apparatus further comprises: the near-field induction equipment is used for acquiring high-frequency magnetic field signals around a bearing of the generator and generating frequency spectrum signals of the acquired high-frequency magnetic field signals; wherein the test device is configured to perform the following operations: receiving a spectral signal of the high-frequency magnetic field signal from a near-field induction device; analyzing the frequency spectrum signal to obtain the frequency of the high-frequency magnetic field signal; determining whether a frequency of the high-frequency magnetic field signal is within a specific frequency range; determining that a magnetic field satisfying a preset condition exists when the frequency of the high-frequency magnetic field signal is within a specific frequency range.
Optionally, the detection apparatus further comprises: the near-field induction equipment is used for acquiring high-frequency magnetic field signals around a bearing of the generator and generating frequency spectrum signals of the acquired high-frequency magnetic field signals; the system is used for acquiring a generator rotating speed signal and generating a rotating speed frequency spectrum signal of the acquired generator rotating speed signal; wherein the test device is configured to perform the following operations: receiving a spectral signal of the high-frequency magnetic field signal from a near-field induction device; analyzing the frequency spectrum signal to obtain the frequency of the high-frequency magnetic field signal and the frequency of the high-frequency magnetic field signal; receiving a rotating speed frequency spectrum signal of the generator rotating speed signal from the near-field induction equipment; analyzing the rotating speed frequency spectrum signal to obtain the frequency of the rotating speed signal of the generator; determining whether a frequency of the high-frequency magnetic field signal is within a specific frequency range and whether a frequency at which the high-frequency magnetic field signal appears is an integer multiple of a frequency of the generator rotational speed signal; and when the frequency of the high-frequency magnetic field signal is in a specific frequency range and the frequency of the high-frequency magnetic field signal is an integral multiple of the frequency of the generator rotating speed signal, determining that a magnetic field meeting a preset condition exists.
Optionally, the near field induction device is arranged around a bearing of the generator in a contactless manner.
Optionally, the near field induction device comprises: a magnetic field signal acquisition circuit, wherein the magnetic field signal acquisition circuit comprises: a high-frequency induction coil or antenna for detecting a high-frequency magnetic field signal; the signal amplification circuit is used for amplifying the detected high-frequency magnetic field signal; the filter circuit is used for filtering the amplified high-frequency magnetic field signal; and a spectrum signal generation circuit for generating a spectrum signal of the high-frequency magnetic field signal after the filtering processing.
Optionally, the near field induction device comprises: a magnetic field signal acquisition circuit and a speed signal acquisition circuit; wherein the magnetic field signal acquisition circuit comprises: a high-frequency induction coil or antenna for detecting a high-frequency magnetic field signal; the signal amplification circuit is used for amplifying the detected high-frequency magnetic field signal; the filter circuit is used for filtering the amplified high-frequency magnetic field signal; a spectrum signal generation circuit for generating a spectrum signal of the high-frequency magnetic field signal after the filtering processing; wherein, speed signal acquisition circuit includes: the speed sensor is used for acquiring a rotating speed signal of the generator; the pulse signal generating circuit is used for generating a speed pulse signal of the collected generator rotating speed signal; and the speed spectrum signal generating circuit is used for generating a speed spectrum signal of the speed pulse signal.
Optionally, the specific frequency range is 1MHz to 500 MHz.
According to an exemplary embodiment of the present disclosure, a computer-readable storage medium is provided, in which a computer program is stored, which, when being executed by a processor, carries out the method of detecting a generator shaft current as described above.
According to an exemplary embodiment of the present disclosure, there is provided an electronic apparatus including: a processor; a memory storing a computer program which, when executed by the processor, implements the method of detecting generator shaft current as described above.
According to the method and the device for detecting the shaft current of the generator, whether the shaft current exists in the generator can be detected conveniently, quickly, in real time and accurately.
The technical scheme provided by the embodiment of the disclosure can also at least bring the following beneficial effects:
when the shaft current is detected, the shaft current can be detected at any time without stopping the machine, so that the detection is convenient and quick;
when the shaft current is detected, the generator does not need to be modified or equipment does not need to be added, so that the detection is convenient and quick;
the shaft current is detected in a non-contact mode, and the high-frequency probe can be used for inducing a space high-frequency magnetic field in a near-field detection mode to detect the shaft current.
Additional aspects and/or advantages of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the general inventive concept.
Drawings
The above and other objects and features of the exemplary embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings which illustrate exemplary embodiments, wherein:
FIG. 1 illustrates a flow chart of a method of detecting generator shaft current according to an exemplary embodiment of the present disclosure;
FIG. 2 illustrates a flow chart of a method of detecting the presence of a magnetic field around a bearing of a generator that satisfies a preset condition according to an exemplary embodiment of the present disclosure;
FIG. 3 shows a flow chart of a method of detecting the presence of a magnetic field around a bearing of a generator that meets a preset condition according to another exemplary embodiment of the present disclosure;
FIG. 4 illustrates a rotational speed frequency spectrum of a generator rotational speed signal according to an exemplary embodiment of the present disclosure;
FIG. 5 illustrates a block diagram of a generator shaft current detection device according to an exemplary embodiment of the present disclosure;
FIG. 6 illustrates a block diagram of a generator shaft current detection arrangement according to another exemplary embodiment of the present disclosure;
FIG. 7 shows a block diagram of a test apparatus according to an example embodiment of the present disclosure;
FIG. 8 shows a block diagram of a near field induction device according to an example embodiment of the present disclosure;
fig. 9 shows a block diagram of a near field induction device according to another exemplary embodiment of the present disclosure;
FIG. 10 shows a schematic diagram of a detection device of generator shaft current according to an exemplary embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present disclosure by referring to the figures.
Fig. 1 shows a flow chart of a method of detecting generator shaft current according to an exemplary embodiment of the present disclosure.
Referring to fig. 1, in step S10, it is detected whether a magnetic field satisfying a preset condition exists around a bearing of a generator.
As an example, the preset condition may include: the frequency of the magnetic field signal is within a particular frequency range.
As an example, the specific frequency range may be 1MHz to 500 MHz. It should be understood that the frequency range of 1MHz to 500MHz is merely an example, and the specific frequency range may be set to other suitable value ranges.
As an example, the preset condition may further include: the magnetic field occurs at a frequency that is an integer multiple of the frequency of the generator speed.
When it is determined at step S10 that there is a magnetic field satisfying the preset condition, step S20 is performed, and it is determined that the generator generates a shaft current.
The present disclosure considers that shaft current is discharged from a rotating shaft through a bearing, high temperature is generated instantaneously due to small contact area, the bearing is locally fused, and the generated electric arc is extruded by the rolling of the bearing and is diffused to two sides to form strip-shaped arc injury. This is disclosed through the destruction process of counter shaft current to the bearing analysis, reachs: when the shaft current exists, a punctiform discharge phenomenon can occur and electric arcs are generated; then the arc will necessarily generate a high frequency magnetic field during generation, for example, a high frequency magnetic field in the frequency range of l-500 MHz. Accordingly, the present disclosure proposes determining whether a shaft current is generated by detecting the presence or absence of the high frequency magnetic field around the bearings of the generator.
Furthermore, the present disclosure considers that the generator also generates a disturbing magnetic field when in operation, but the disturbing magnetic field appears irregularly, i.e. without periodicity, independent of the generator speed. Therefore, the present disclosure further proposes to measure the generator speed synchronously, and to distinguish whether the high-frequency magnetic field generated by the arc or the magnetic field generated by the generator during operation, by using the relationship between the generator speed signal and the high-frequency magnetic field generated by the arc, i.e., the frequency of occurrence of the high-frequency magnetic field generated by the arc is related to the generator speed. In addition, the magnetic field generated by the generator during operation is mostly a low-frequency magnetic field, and generally does not reach frequencies above 1 MHz. Therefore, according to the embodiment of the disclosure, the discharge of the shaft current at the end of the generator shaft is monitored by utilizing the high-frequency characteristic of the magnetic field generated by the arc and the characteristic related to the rotating speed of the generator, so as to determine whether the generator generates the shaft current. That is, when it is detected that a high-frequency magnetic field exists around the bearing of the generator and the frequency of occurrence of this high-frequency magnetic field is an integral multiple of the frequency of the rotational speed of the generator, it can be determined that this high-frequency magnetic field is a discharge phenomenon resulting from the shaft current, which must exist if there is a discharge phenomenon.
Fig. 2 illustrates a flowchart of a method of detecting whether a magnetic field satisfying a preset condition exists around a bearing of a generator according to an exemplary embodiment of the present disclosure.
Referring to fig. 2, in step S101, a spectrum signal of a high frequency magnetic field signal around a bearing of a generator is received from a near field induction device.
As an example, a frequency greater than a preset threshold may be referred to as a high frequency.
In step S102, the spectrum signal is analyzed to obtain the frequency of the high-frequency magnetic field signal.
In step S103, it is determined whether the frequency of the high-frequency magnetic field signal is within a specific frequency range.
When it is determined in step S103 that the frequency of the high-frequency magnetic field signal is within the specific frequency range, step S104 is performed to determine that a magnetic field satisfying a preset condition exists.
It should be understood that when the near-field induction device collects a plurality of high-frequency magnetic field signals around the bearing of the generator, if it is determined that the frequency of any one of the high-frequency magnetic field signals is within a specific frequency range at step S103, it is determined that a magnetic field satisfying a preset condition exists. In other words, as long as a high-frequency magnetic field signal having a frequency within a specific frequency range is detected around the bearing of the generator, it can be determined that a magnetic field satisfying a preset condition exists.
Fig. 3 shows a flowchart of a method of detecting whether a magnetic field satisfying a preset condition exists around a bearing of a generator according to another exemplary embodiment of the present disclosure.
Referring to fig. 3, in step S201, a spectrum signal of a high frequency magnetic field signal around a bearing of a generator is received from a near field induction device.
In step S202, the spectrum signal is analyzed to obtain the frequency of the high-frequency magnetic field signal and the frequency of the high-frequency magnetic field signal.
In step S203, a rotation speed spectrum signal of the collected generator rotation speed signal is received from the near-field induction device.
For example, FIG. 4 shows a speed spectrum of a generator speed signal. The abscissa indicates frequency and the ordinate indicates amplitude energy.
In step S204, the rotational speed frequency spectrum signal is analyzed to obtain the frequency of the generator rotational speed signal.
It should be understood that step S202 needs to be executed after step S201, step S204 needs to be executed after step S203, and besides, the execution order of step S201, step S202, step S203, and step S204 is not limited. For example, step S201 and step S203 may be performed simultaneously, that is, the spectrum signal and the rotational speed spectrum signal are received together from the near-field induction device.
In step S205, it is determined whether the frequency of the high-frequency magnetic field signal is within a specific frequency range and whether the frequency at which the high-frequency magnetic field signal appears is an integral multiple of the frequency of the generator rotational speed signal.
For example, it may be determined whether the frequency of the high-frequency magnetic field signal is within a specific frequency range, and when it is determined that the frequency of the high-frequency magnetic field signal is within the specific frequency range, it may be determined whether the frequency at which the high-frequency magnetic field signal appears is an integral multiple of the frequency of the generator rotational speed signal.
When it is determined in step S205 that the frequency of the high-frequency magnetic field signal is within the specific frequency range and the frequency of the high-frequency magnetic field signal is an integral multiple of the frequency of the generator rotational speed signal, step S206 is performed to determine that a magnetic field satisfying a preset condition exists.
Fig. 5 shows a block diagram of a structure of a detection device of a generator shaft current according to an exemplary embodiment of the present disclosure.
The generator shaft current detection apparatus according to an exemplary embodiment of the present disclosure includes: the device 10 is tested.
In particular, the test device 10 is configured to perform the following operations: detecting whether a magnetic field meeting preset conditions exists around a bearing of the generator; and determining that the generator generates the shaft current when the magnetic field satisfying the preset condition exists.
As an example, the preset condition may include: the frequency of the magnetic field signal is within a particular frequency range.
As an example, the preset condition may further include: the magnetic field occurs at a frequency that is an integer multiple of the frequency of the generator speed.
As an example, the specific frequency range may be 1MHz to 500 MHz.
Fig. 6 shows a block diagram of a structure of a detection device of a generator shaft current according to another exemplary embodiment of the present disclosure.
The detection apparatus of generator shaft current according to another exemplary embodiment of the present disclosure includes a near-field induction device 20 in addition to the test device 10.
Specifically, the near-field induction device 20 is configured to collect a high-frequency magnetic field signal around a bearing of the generator and generate a spectrum signal of the collected high-frequency magnetic field signal.
Further, as an example, the near field induction device 20 may be further configured to collect a generator speed signal and generate a speed spectrum signal of the collected generator speed signal.
As an example, the near field induction device 20 may be arranged around the bearings of the generator in a contactless manner. For example, arranged around the bearings of the generator in a contactless fixation or by the user holding the device in his hand.
As an example, the near field induction device 20 may be configured in the form of a probe.
In one embodiment, the test apparatus 10 may be configured to perform the following operations:
receiving a spectrum signal of the high frequency magnetic field signal from the near field induction device 20;
analyzing the frequency spectrum signal to obtain the frequency of the high-frequency magnetic field signal;
determining whether a frequency of the high-frequency magnetic field signal is within a specific frequency range;
determining that a magnetic field satisfying a preset condition exists when the frequency of the high-frequency magnetic field signal is within a specific frequency range.
In another embodiment, the test apparatus 10 may be configured to perform the following operations:
receiving a spectrum signal of the high frequency magnetic field signal from the near field induction device 20;
analyzing the frequency spectrum signal to obtain the frequency of the high-frequency magnetic field signal and the frequency of the high-frequency magnetic field signal;
receiving a rotational speed frequency spectrum signal of the generator rotational speed signal from the near field induction device 20;
analyzing the rotating speed frequency spectrum signal to obtain the frequency of the rotating speed signal of the generator;
determining whether a frequency of the high-frequency magnetic field signal is within a specific frequency range and whether a frequency at which the high-frequency magnetic field signal appears is an integer multiple of a frequency of the generator rotational speed signal;
and when the frequency of the high-frequency magnetic field signal is in a specific frequency range and the frequency of the high-frequency magnetic field signal is an integral multiple of the frequency of the generator rotating speed signal, determining that a magnetic field meeting a preset condition exists.
Fig. 7 illustrates a block diagram of a test apparatus according to an exemplary embodiment of the present disclosure.
As shown in fig. 7, the test apparatus 10 according to an exemplary embodiment of the present disclosure includes: a signal input circuit 101, a signal acquisition circuit 102, a processing unit 103, a display unit 104, and a storage unit 105.
Specifically, the signal input circuit 101 is configured to receive a frequency spectrum signal of the high-frequency magnetic field signal and a rotational speed frequency spectrum signal of the generator rotational speed signal from the near-field induction device 20.
The signal acquisition circuit 102 is configured to perform high-speed a/D acquisition (i.e., convert an analog signal into a digital signal) on a signal received by the signal input circuit 101, and send acquired data to the processing unit 103.
The processing unit 103 is used for performing data analysis on the received data to obtain a processing result of whether the generator generates the shaft current. As an example, when the processing unit 103 receives data sent by the signal acquisition circuit 102, the data may be subjected to a previous stage of data processing and then subjected to data analysis, for example, a filtering operation.
The display unit 104 is used for displaying the processing result of the processing unit 103.
The holding unit 105 is used to hold the processing result of the processing unit 103.
Fig. 8 illustrates a block diagram of a near field induction device according to an exemplary embodiment of the present disclosure.
Referring to fig. 8, a near field induction device 20 according to an exemplary embodiment of the present disclosure includes: a magnetic field signal acquisition circuit 201. The magnetic field signal acquisition circuit 201 is configured to acquire a high-frequency magnetic field signal around a bearing of the generator and generate a frequency spectrum signal of the acquired high-frequency magnetic field signal.
The magnetic field signal acquisition circuit 201 includes: a high-frequency induction coil or antenna 2011, a signal amplification circuit 2012, a filter circuit 2013, and a spectrum signal generation circuit 2014.
Specifically, a high-frequency induction coil or antenna 2011 is used to detect high-frequency magnetic field signals.
The signal amplification circuit 2012 amplifies the detected high-frequency magnetic field signal.
The filter circuit 2013 is configured to filter the amplified high-frequency magnetic field signal.
The spectrum signal generation circuit 2014 is configured to generate a spectrum signal of the high-frequency magnetic field signal after the filtering processing.
Further, as an example, the near field induction device 20 according to an exemplary embodiment of the present disclosure may further include: power supply circuitry to provide power to other devices in the near field inductive apparatus 20.
Fig. 9 illustrates a block diagram of a near field induction device according to another exemplary embodiment of the present disclosure.
Referring to fig. 9, the near field induction device 20 according to an exemplary embodiment of the present disclosure includes a velocity signal acquisition circuit 202 in addition to the magnetic field signal acquisition circuit 201. The speed signal acquisition circuit 202 is used for acquiring a generator rotation speed signal and generating a rotation speed frequency spectrum signal of the acquired generator rotation speed signal.
The speed signal acquisition circuit 202 includes: a speed sensor 2021, a pulse signal generation circuit 2022, and a speed spectrum signal generation circuit 2023.
Specifically, the speed sensor 2021 is used to collect a generator speed signal.
The pulse signal generation circuit 2022 is used to generate a speed pulse signal of the collected generator rotational speed signal.
The velocity spectrum signal generating circuit 2023 generates a velocity spectrum signal of the velocity pulse signal.
FIG. 10 shows a schematic diagram of a detection device of generator shaft current according to an exemplary embodiment of the present disclosure.
As shown in fig. 10, the generator shaft current detection apparatus according to the exemplary embodiment of the present disclosure may further include a handle 30 and a wire 40 for connecting the near field induction device 20 and the test device 10, in addition to the test device 10 and the near field induction device 20.
It should be understood that the specific processes performed by the generator shaft current detection device according to the exemplary embodiment of the present disclosure have been described in detail with reference to fig. 1 to 4, and the details thereof will not be described herein.
It should be understood that various devices in the generator shaft current detection apparatus according to the exemplary embodiments of the present disclosure may be implemented as hardware components and/or software components. Those skilled in the art may implement the respective devices, for example, using Field Programmable Gate Arrays (FPGAs) or Application Specific Integrated Circuits (ASICs), according to the processing performed by the respective devices as defined.
Exemplary embodiments of the present disclosure provide a computer-readable storage medium storing a computer program which, when executed by a processor, implements the method of detecting a generator shaft current as described in the above exemplary embodiments. The computer readable storage medium is any data storage device that can store data which can be read by a computer system. Examples of computer-readable storage media include: read-only memory, random access memory, read-only optical disks, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the internet via wired or wireless transmission paths).
An electronic device according to an exemplary embodiment of the present disclosure includes: a processor (not shown) and a memory (not shown), wherein the memory stores a computer program which, when executed by the processor, implements the method of detecting generator shaft current as described in the above exemplary embodiments.
Although a few exemplary embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.
Claims (15)
1. A method of detecting generator shaft current, the method comprising:
detecting whether a magnetic field meeting preset conditions exists around a bearing of the generator;
determining that the generator generates a shaft current when a magnetic field satisfying a preset condition exists;
wherein the preset conditions include: the frequency of the magnetic field signal is within a particular frequency range.
2. The detection method according to claim 1, wherein the preset condition further comprises: the magnetic field occurs at a frequency that is an integer multiple of the frequency of the generator speed.
3. The method for detecting according to claim 1, wherein detecting whether a magnetic field satisfying a preset condition exists around a bearing of a generator comprises:
receiving a frequency spectrum signal of a high-frequency magnetic field signal around a bearing of the generator collected from the near-field induction device;
analyzing the frequency spectrum signal to obtain the frequency of the high-frequency magnetic field signal;
determining whether a frequency of the high-frequency magnetic field signal is within a specific frequency range;
determining that a magnetic field satisfying a preset condition exists when the frequency of the high-frequency magnetic field signal is within a specific frequency range.
4. The method for detecting according to claim 2, wherein detecting whether a magnetic field satisfying a preset condition exists around a bearing of a generator comprises:
receiving a frequency spectrum signal of a high-frequency magnetic field signal around a bearing of the generator collected from the near-field induction device;
analyzing the frequency spectrum signal to obtain the frequency of the high-frequency magnetic field signal and the frequency of the high-frequency magnetic field signal;
receiving a rotating speed frequency spectrum signal of the collected generator rotating speed signal from the near-field induction equipment;
analyzing the rotating speed frequency spectrum signal to obtain the frequency of the rotating speed signal of the generator;
determining whether a frequency of the high-frequency magnetic field signal is within a specific frequency range and whether a frequency at which the high-frequency magnetic field signal appears is an integer multiple of a frequency of the generator rotational speed signal;
and when the frequency of the high-frequency magnetic field signal is in a specific frequency range and the frequency of the high-frequency magnetic field signal is an integral multiple of the frequency of the generator rotating speed signal, determining that a magnetic field meeting a preset condition exists.
5. The detection method according to any one of claims 1 to 4, wherein the specific frequency range is 1MHz to 500 MHz.
6. A generator shaft current sensing device, comprising:
a test device configured to perform the following operations:
detecting whether a magnetic field meeting preset conditions exists around a bearing of the generator;
determining that the generator generates a shaft current when a magnetic field satisfying a preset condition exists;
wherein the preset conditions include: the frequency of the magnetic field signal is within a particular frequency range.
7. The detection device according to claim 6, wherein the preset condition further comprises: the magnetic field occurs at a frequency that is an integer multiple of the frequency of the generator speed.
8. The detection device of claim 6, further comprising:
the near-field induction equipment is used for acquiring high-frequency magnetic field signals around a bearing of the generator and generating frequency spectrum signals of the acquired high-frequency magnetic field signals;
wherein the test device is configured to perform the following operations:
receiving a spectral signal of the high-frequency magnetic field signal from a near-field induction device;
analyzing the frequency spectrum signal to obtain the frequency of the high-frequency magnetic field signal;
determining whether a frequency of the high-frequency magnetic field signal is within a specific frequency range;
determining that a magnetic field satisfying a preset condition exists when the frequency of the high-frequency magnetic field signal is within a specific frequency range.
9. The detection device according to claim 7, further comprising:
the near-field induction equipment is used for acquiring high-frequency magnetic field signals around a bearing of the generator and generating frequency spectrum signals of the acquired high-frequency magnetic field signals; the system is used for acquiring a generator rotating speed signal and generating a rotating speed frequency spectrum signal of the acquired generator rotating speed signal;
wherein the test device is configured to perform the following operations:
receiving a spectral signal of the high-frequency magnetic field signal from a near-field induction device;
analyzing the frequency spectrum signal to obtain the frequency of the high-frequency magnetic field signal and the frequency of the high-frequency magnetic field signal;
receiving a rotating speed frequency spectrum signal of the generator rotating speed signal from the near-field induction equipment;
analyzing the rotating speed frequency spectrum signal to obtain the frequency of the rotating speed signal of the generator;
determining whether a frequency of the high-frequency magnetic field signal is within a specific frequency range and whether a frequency at which the high-frequency magnetic field signal appears is an integer multiple of a frequency of the generator rotational speed signal;
and when the frequency of the high-frequency magnetic field signal is in a specific frequency range and the frequency of the high-frequency magnetic field signal is an integral multiple of the frequency of the generator rotating speed signal, determining that a magnetic field meeting a preset condition exists.
10. A testing device according to claim 8 or 9, wherein the near field induction means is arranged in a non-contacting manner around the bearings of the generator.
11. The detection apparatus according to claim 8, wherein the near field induction device comprises: a magnetic field signal acquisition circuit for acquiring a magnetic field signal,
wherein the magnetic field signal acquisition circuit comprises:
a high-frequency induction coil or antenna for detecting a high-frequency magnetic field signal;
the signal amplification circuit is used for amplifying the detected high-frequency magnetic field signal;
the filter circuit is used for filtering the amplified high-frequency magnetic field signal;
and a spectrum signal generation circuit for generating a spectrum signal of the high-frequency magnetic field signal after the filtering processing.
12. The detection apparatus according to claim 9, wherein the near field induction device comprises: a magnetic field signal acquisition circuit and a speed signal acquisition circuit;
wherein the magnetic field signal acquisition circuit comprises:
a high-frequency induction coil or antenna for detecting a high-frequency magnetic field signal;
the signal amplification circuit is used for amplifying the detected high-frequency magnetic field signal;
the filter circuit is used for filtering the amplified high-frequency magnetic field signal;
a spectrum signal generation circuit for generating a spectrum signal of the high-frequency magnetic field signal after the filtering processing;
wherein, speed signal acquisition circuit includes:
the speed sensor is used for acquiring a rotating speed signal of the generator;
the pulse signal generating circuit is used for generating a speed pulse signal of the collected generator rotating speed signal;
and the speed spectrum signal generating circuit is used for generating a speed spectrum signal of the speed pulse signal.
13. The detection apparatus according to any one of claims 6 to 9, 11, and 12, wherein the specific frequency range is 1MHz to 500 MHz.
14. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out a method of detecting a generator shaft current according to any one of claims 1 to 5.
15. An electronic device, characterized in that the electronic device comprises:
a processor;
memory storing a computer program which, when executed by a processor, implements the method of detecting generator shaft current as claimed in any one of claims 1 to 5.
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