CN215986428U - Generator rotor turn-to-turn short circuit detection device based on repetitive pulse RSO method - Google Patents
Generator rotor turn-to-turn short circuit detection device based on repetitive pulse RSO method Download PDFInfo
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- CN215986428U CN215986428U CN202122096008.0U CN202122096008U CN215986428U CN 215986428 U CN215986428 U CN 215986428U CN 202122096008 U CN202122096008 U CN 202122096008U CN 215986428 U CN215986428 U CN 215986428U
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Abstract
A generator rotor turn-to-turn short circuit detection device based on a repetitive pulse RSO method belongs to the field of detection devices. The problem of current generator rotor turn-to-turn short circuit detection device need cooperate with the oscilloscope to and detection device on-the-spot wiring complicated, require high to operating personnel's skill is solved. A control unit of the device outputs a synchronous control signal to an excitation signal output control switch and an acquisition signal control switch, and realizes data interaction with an excitation signal generation unit through an FSMC data communication bus; the excitation signal generated by the excitation signal generating unit is transmitted to two signal terminals through the excitation signal driving unit, the control switch and the output impedance potentiometers R1 and R2; feedback signals of the two signal terminals are fed back to the excitation signal generating unit through the acquisition signal control switch and the data acquisition unit. The device does not need an oscilloscope when detecting the winding, is simple to operate, and is suitable for field detection of turn-to-turn short circuit of the motor winding.
Description
Technical Field
The utility model relates to a detection device, in particular to a generator rotor turn-to-turn short circuit detection device based on a repetitive pulse method.
Background
The turn-to-turn short circuit of the generator rotor winding is a common electrical fault in the running process of the generator, and the slight turn-to-turn short circuit has small influence on the running of the generator, but can cause the increase of the exciting current of the generator, the relative reduction of the reactive power and the increase of the unbalanced vibration of the bearing. Once the severity of turn-to-turn short circuit of the rotor is increased, the rotor is subjected to ground fault, the large shaft of the rotor is magnetized, and the shaft neck and the bearing bush are burnt by a serious person, so that the safe and stable operation of the unit is greatly threatened. Whether the influence of the turn-to-turn short circuit position of the generator on the unit can be accurately detected is large.
At present, the measuring and positioning device for the turn-to-turn short circuit of the generator rotor is an excitation signal generating device purchased at an inlet, and is matched with an oscilloscope for use, and the oscilloscope analyzes and collects the waveform of a pulse injection point. And the other method is that a domestic waveform acquisition device and acquisition software are added on the basis of imported excitation signal generation equipment, and whether the rotor winding has short circuit or not is analyzed according to the waveform acquired by the upper computer software. The main defects of the prior art are as follows:
1. the detection process needs to be matched with an oscilloscope, and the operation is complex.
2. In the detection process, the wiring of the device is complex, and the requirement on the skill of an operator is high.
SUMMERY OF THE UTILITY MODEL
The problem of current generator rotor turn-to-turn short circuit detection device need cooperate with the oscilloscope to and detection device on-the-spot wiring complicated, require high to operating personnel's skill is solved.
The utility model aims to realize the accurate positioning of turn-to-turn detection of the generator rotor and integrate the excitation signal generation and acquisition device.
A generator rotor turn-to-turn short circuit detection device based on a repetitive pulse RSO method, the device comprises: the device comprises an excitation signal generating unit, an excitation signal driving unit, an excitation signal output control switch, a data acquisition unit, an acquisition signal control switch, a control unit, an output impedance potentiometer R1, an output impedance potentiometer R2 and two signal terminals;
the control unit outputs a synchronous control signal to the excitation signal output control switch and the acquisition signal control switch, and the control unit realizes data interaction with the excitation signal generation unit through an FSMC data communication bus;
the excitation signal generation unit generates an excitation signal and outputs the excitation signal to the excitation signal driving unit, the excitation signal driving unit outputs two paths of excitation signals to the excitation signal output control switch after carrying out waveform adjustment on the received excitation signal, and the excitation signal output control switch sends the two paths of excitation signals to two signal terminals after passing through an output impedance potentiometer R1 and an output impedance potentiometer R2 respectively;
the two signal terminals are also respectively connected to two signal input ends of the acquisition signal control switch, two signal output ends of the acquisition signal control switch are connected to two signal acquisition ends of the data acquisition unit, and the data acquisition unit outputs acquisition signals to the excitation signal generation unit.
Furthermore, the excitation signal generating unit generates a signal with the repetition frequency of 1-100 kHz and the amplitude of 1-12V of the excitation signal.
Further, the excitation signal generating unit comprises a programmable gate array FPGA circuit and a D/A converter;
the FPGA circuit is used for generating and outputting a digital excitation signal to the D/A converter, and the D/A converter performs digital-to-analog conversion on the excitation signal to form an excitation signal and outputs the excitation signal to the excitation signal driving unit;
the FIF0 memory of the FPGA circuit is used for receiving the acquisition signal output by the data acquisition unit.
Further, the D/A converter is a 12-bit D/A converter.
Further, the excitation signal driving unit comprises a waveform rising adjusting unit and two drivers;
the waveform rising adjusting unit is used for carrying out waveform adjustment on the received excitation signal and then simultaneously sending the excitation signal to the two drivers, and the two drivers are used for amplifying the received signal and then outputting the amplified signal to the excitation signal output control switch.
Furthermore, the excitation signal output control switch is two double-path electronic switches; the acquisition signal control switch is a relay of a two-way switch.
Furthermore, the data acquisition unit comprises two groups of signal acquisition modules, the two groups of signal acquisition modules have the same structure, and each signal acquisition module comprises an A/D converter, a differential amplifier and a resistance voltage division network;
the two groups of signal acquisition modules correspond to two signal acquisition ends of the acquisition unit, signals acquired by each signal acquisition end are attenuated by the corresponding resistor voltage division network and then output to the differential amplifier, the differential amplifier outputs signals to the A/D converter, and the A/D converter outputs signals to the excitation signal generation unit.
Further, the control unit is realized by adopting a model of ARM STM32F407IGT 6.
Furthermore, the device also comprises a power supply and power supply management unit, wherein the power supply and power supply management unit provides a working power supply for all elements of the RSO generator rotor winding turn-to-turn short circuit detection device.
Furthermore, the device also comprises a shell and a panel, wherein the excitation signal generating unit, the excitation signal driving unit, the excitation signal output control switch, the data acquisition unit, the acquisition signal control switch and the control unit are fixed in the shell, the panel is used for sealing the shell, the output impedance potentiometer R1 and the output impedance potentiometer R2 are fixed on the panel, the adjustable end of the output impedance potentiometer R1 and the adjustable end of the output impedance potentiometer R2 are positioned outside the panel, the two signal terminals are fixed on the panel, and the panel is also provided with a grounding endpoint.
The utility model provides a device for detecting the turn-to-turn short circuit of a motor winding, which realizes the sending of an excitation signal and the acquisition of a feedback signal of the motor winding, solves the problems that the existing generator rotor turn-to-turn short circuit detection device needs to be matched with an oscilloscope, the field wiring of the detection device is complex, and the requirement on the skill of an operator is high, and has the following specific effects:
1. the utility model is obtained by further development on the basis of the existing generator rotor turn-to-turn short circuit detection device, and overcomes the defects of the original detection device.
2. The utility model also comprises an excitation signal generating and collecting module, and in practical application, the defect that the original similar products need to be matched by using an oscilloscope is overcome.
3. The same set of terminals is used for signal sending and signal collection, compared with the original similar products, the on-site wiring is simple, only two terminals are required to be connected with two electric brushes of the motor respectively, and common technical workers can operate the motor.
4. The utility model adopts the programmable gate array FPGA circuit as an excitation signal generating unit, the DDS signal generator is contained in the programmable gate array FPGA circuit, and the DDS signal generator can accurately generate signals with specified frequency, so that technicians in the field can generate excitation signals with stable frequency by adopting conventional technical means, and the detection accuracy is improved.
5. The control unit can be usually realized by adopting the existing control chip with a memory, so that the storage of the acquired signals can be realized, the storage of historical data is realized, and the reference of the historical data is provided for rapidly positioning the position of the fault point when retesting is realized.
6. Based on the detection device provided by the utility model, the technical personnel in the field can further develop and realize more functions. For example: the device of the utility model is used for realizing on-site signal acquisition, and then the data acquired by the utility model is acquired by a remote data acquisition means and is processed and analyzed, thereby realizing the function of remote detection.
Drawings
Fig. 1 is an electrical schematic diagram of a RSO generator rotor winding turn-to-turn short circuit detection device.
Fig. 2 is an external structure schematic diagram of a RSO-based generator rotor winding turn-to-turn short circuit detection device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.
First embodiment this embodiment is described with reference to fig. 1. The generator rotor turn-to-turn short circuit detection device based on the repetitive pulse RSO method in the first embodiment comprises the following steps: the device comprises an excitation signal generating unit 1, an excitation signal driving unit 2, an excitation signal output control switch 3, a data acquisition unit 4, an acquisition signal control switch 5, a synchronous control unit 6, an output impedance potentiometer R1, an output impedance potentiometer R2 and two signal terminals 7;
the synchronous control unit 6 outputs a synchronous control signal to the excitation signal output control switch 3 and the acquisition signal control switch 5, and the synchronous control unit 6 realizes data interaction with the excitation signal generation unit 1 through an FSMC data communication bus;
the excitation signal generation unit 1 generates an excitation signal and outputs the excitation signal to the excitation signal driving unit 2, the excitation signal driving unit 2 outputs two excitation signals to the excitation signal output control switch 3 after performing waveform adjustment on the received excitation signal, and the excitation signal output control switch 3 sends the two excitation signals to two signal terminals after passing through an output impedance potentiometer R1 and an output impedance potentiometer R2 respectively;
the two signal terminals are also respectively connected to two signal input ends of the acquisition signal control switch 5, two signal output ends of the acquisition signal control switch 5 are connected to two signal acquisition ends of the data acquisition unit 4, and the data acquisition unit 4 outputs an acquisition signal to the excitation signal generation unit 1.
The device of the first embodiment integrates the excitation signal generation and the data acquisition device, and can perform test analysis on the rotor winding without an external oscilloscope, so that the field test operation is more convenient and flexible.
The device is in practical application for realize detecting signal's collection, specific process is: and connecting two ends of a winding coil of the motor to be detected with two signal input ends of the acquisition signal control switch 5 respectively. Then, the control module controls the acquisition signal control switch 5 and the excitation signal output control switch 3 to realize the emission and the acquisition of the excitation signal.
In actual work, technicians compare and analyze excitation signals sent by the device and acquired acquisition signals, the condition whether the coil of the motor winding to be detected has turn-to-turn short circuit can be obtained, the data is further analyzed, and the position information of the coil short circuit can be obtained.
In this embodiment, the repetition frequency of the excitation signal generated by the excitation signal generating unit 1 is 1 to 100kHz, and the amplitude is 1 to 12V.
The excitation signal is more suitable for detecting the turn-to-turn short circuit condition of the motor winding.
Second embodiment this embodiment will be described with reference to fig. 1. In this embodiment, the generator rotor turn-to-turn short circuit detection apparatus based on the repetitive pulse RSO method is further defined in the first embodiment, in this embodiment, the excitation signal generation unit 1 includes a programmable gate array FPGA circuit and a D/a converter;
the FPGA circuit is used for generating and outputting a digital excitation signal to the D/A converter, and the D/A converter performs digital-to-analog conversion on the excitation signal to form an excitation signal and outputs the excitation signal to the excitation signal driving unit 2.
In the embodiment, a programmable gate array FPGA circuit is adopted to realize the generation of the digital excitation signal, the programmable gate array FPGA circuit comprises a DDS signal generator, the signal generator can accurately generate the digital signal with the designated frequency according to the setting, the frequency stability of the generated signal is good, the digital excitation signal generated by the signal generator can ensure the accuracy and the stability of the frequency of the device, and then the digital excitation signal is converted into an analog signal serving as an excitation signal source through a D/A converter, so that the frequency stability and the accuracy of the excitation signal are effectively ensured.
The D/a converter may employ a 12-bit D/a converter.
Third embodiment this embodiment is described with reference to fig. 1. In this embodiment, the generator rotor turn-to-turn short circuit detection apparatus based on the repetitive pulse RSO method is further defined in the first embodiment, in this embodiment, the excitation signal driving unit 2 includes a waveform rising adjustment unit and two drivers;
in this embodiment, the received excitation signal is converted into two excitation signals, so as to output the excitation signals to both ends of the motor winding at the same time.
Fourth embodiment this embodiment is described with reference to fig. 1. In this embodiment, the generator rotor turn-to-turn short circuit detection device based on the repetitive pulse RSO method is further defined in the first embodiment, in this embodiment, the excitation signal output control switch 3 is two-way electronic switches; the acquisition signal control switch 5 is a relay of a two-way switch.
In this embodiment, the excitation signal output control switch 3 is implemented by two-way electronic switches, which are controlled by the control unit 6 to be turned on or off, so as to output or stop the excitation signal. The electronic switch has the advantage of high reaction speed. The signal acquisition control switch 5 is realized by a relay of a two-way switch, and the relay is switched on or switched off under the control of the control unit 6, so that the output or stop of the acquired excitation signal is realized. The relay has the advantage of a safety protection circuit.
Example five this example is illustrated with reference to figure 1. In this embodiment, the data acquisition unit 4 includes two sets of signal acquisition modules, the two sets of signal acquisition modules have the same structure, and each signal acquisition module includes an a/D converter, a differential amplifier, and a resistor voltage division network;
the two groups of signal acquisition modules acquire signals corresponding to the two signal acquisition ends of the acquisition unit 4, the signals acquired by each signal acquisition end are attenuated by the corresponding resistor voltage division network and then output to the differential amplifier, the differential amplifier outputs signals to the A/D converter, and the A/D converter outputs signals to the excitation signal generation unit 1.
The differential amplifier is adopted in the embodiment, the nonlinearity and the distortion of an output signal caused by current change are avoided, the excitation signal is output to the high-speed and high-precision A/D converter by the differential amplifier, the excitation signal is converted into a digital signal to be output, and the stability of the digital signal is ensured.
Sixth embodiment this embodiment is described with reference to fig. 1. In this embodiment, the generator rotor turn-to-turn short circuit detection apparatus based on the repetitive pulse RSO method is further limited, and in this embodiment, the control unit 6 is implemented by using an ARM STM32F407IGT 6. The control unit in the embodiment is realized by using an ARM STM32F407IGT6, and the integrated circuit has a flexible external storage controller with up to 32-bit data bus, and can realize the storage function of the acquired signals.
Seventh embodiment this embodiment is described with reference to fig. 1. In this embodiment, the apparatus further includes a power supply and power management unit, and the power supply and power management unit provides a working power supply for all elements of the RSO-based generator rotor winding inter-turn short circuit detection apparatus.
Example eight this example is illustrated with reference to figure 2. The present embodiment is a further limitation to the generator rotor turn-to-turn short circuit detection apparatus based on the repetitive pulse RSO method in the first embodiment, in the present embodiment, the apparatus further includes a housing and a panel, the excitation signal generation unit 1, the excitation signal driving unit 2, the excitation signal output control switch 3, the data acquisition unit 4, the acquisition signal control switch 5, and the control unit 6 are fixed in the housing, the panel is used to close the housing, the adjustable ends of the output impedance potentiometer R1 and the output impedance potentiometer R2 are fixed on the panel, the two signal terminals 7 are fixed on the panel, and the panel is further provided with a ground endpoint.
The present embodiment adds a housing and fixes the adjustable terminal of the output impedance potentiometer R1, the adjustable terminal of the output impedance potentiometer R2, and the two signal terminals 7 to the panel. The device of taking the casing portable, the adjustable end of output impedance potentiometre R1, output impedance potentiometre R2 is located the panel, conveniently implements the adjustment in operation process for two terminals of connecting the motor winding that awaits measuring are located the panel, and the signal line connection when being convenient for detect makes the field test operation convenient and flexible more.
Claims (10)
1. A generator rotor turn-to-turn short circuit detection device based on a repetitive pulse RSO method is characterized by comprising the following steps: the device comprises an excitation signal generating unit (1), an excitation signal driving unit (2), an excitation signal output control switch (3), a data acquisition unit (4), an acquisition signal control switch (5), a control unit (6), an output impedance potentiometer R1, an output impedance potentiometer R2 and two signal terminals (7);
the control unit (6) outputs a synchronous control signal to the excitation signal output control switch (3) and the acquisition signal control switch (5), and the control unit (6) realizes data interaction with the excitation signal generation unit (1) through an FSMC data communication bus;
the excitation signal generating unit (1) generates an excitation signal and outputs the excitation signal to the excitation signal driving unit (2), the excitation signal driving unit (2) performs waveform adjustment on the received excitation signal and outputs two excitation signals to the excitation signal output control switch (3), and the excitation signal output control switch (3) sends the two excitation signals to two signal terminals after passing through the output impedance potentiometer R1 and the output impedance potentiometer R2 respectively;
the two signal terminals (7) are also respectively connected to two signal input ends of the acquisition signal control switch (5), two signal output ends of the acquisition signal control switch (5) are connected to two signal acquisition ends of the data acquisition unit (4), and the data acquisition unit (4) outputs acquisition signals to the excitation signal generation unit (1).
2. The generator rotor turn-to-turn short circuit detection device based on the repetitive pulse RSO method as claimed in claim 1, wherein the excitation signal generation unit (1) generates a signal with an excitation signal repetition frequency of 1-100 kHz and an amplitude of 1-12V.
3. The generator rotor turn-to-turn short circuit detection device based on the repetitive pulse RSO method is characterized in that the excitation signal generation unit (1) comprises a programmable gate array FPGA circuit and a D/A converter;
the FPGA circuit is used for generating and outputting a digital excitation signal to a D/A converter, and the D/A converter performs digital-to-analog conversion on the excitation signal to form an excitation signal and outputs the excitation signal to an excitation signal driving unit (2);
the FIF0 memory of the FPGA circuit is used for receiving the acquisition signal output by the data acquisition unit (4).
4. The generator rotor turn-to-turn short circuit detection device based on the repetitive pulse RSO method as claimed in claim 3, wherein the D/A converter is a 12-bit D/A converter.
5. The generator rotor turn-to-turn short circuit detection device based on the repetitive pulse RSO method is characterized in that the excitation signal driving unit (2) comprises a waveform rising adjusting unit and two drivers;
the waveform rising adjusting unit simultaneously sends the received excitation signal to two drivers after performing waveform adjustment, and the two drivers output the received signal to an excitation signal output control switch (3) after amplifying the received signal.
6. The generator rotor turn-to-turn short circuit detection device based on the repetitive pulse RSO method is characterized in that the excitation signal output control switch (3) is two-way electronic switches; the acquisition signal control switch (5) is a two-way switch relay.
7. The generator rotor turn-to-turn short circuit detection device based on the repetitive pulse RSO method is characterized in that the data acquisition unit (4) comprises two groups of signal acquisition modules, the two groups of signal acquisition modules are identical in structure, and each signal acquisition module comprises an A/D converter, a differential amplifier and a resistor voltage division network;
the two groups of signal acquisition modules correspond to two signal acquisition ends of the acquisition unit (4), signals acquired by each signal acquisition end are attenuated by a resistor voltage division network in the acquisition module and then output to a differential amplifier, the differential amplifier outputs signals to an A/D converter, and the A/D converter outputs signals to the excitation signal generation unit (1).
8. The generator rotor turn-to-turn short circuit detection device based on the repetitive pulse RSO method as claimed in claim 1, wherein the control unit (6) is realized by using model number ARM STM32F407IGT 6.
9. The generator rotor turn-to-turn short circuit detection device based on the repetitive pulse RSO method as claimed in claim 1, further comprising a power supply and power management unit, wherein the power supply and power management unit provides working power for all elements of the generator rotor winding turn-to-turn short circuit detection device based on the RSO method.
10. The generator rotor turn-to-turn short circuit detection device based on the repetitive pulse RSO method is characterized by further comprising a shell and a panel, wherein the excitation signal generation unit (1), the excitation signal driving unit (2), the excitation signal output control switch (3), the data acquisition unit (4), the acquisition signal control switch (5) and the control unit (6) are fixed in the shell, the panel is used for closing the shell, the output impedance potentiometer R1 and the output impedance potentiometer R2 are fixed on the panel, the adjustable end of the output impedance potentiometer R1 and the adjustable end of the output impedance potentiometer R2 are located on the outer side of the panel, the two signal terminals (7) are fixed on the panel, and the panel is further provided with a ground terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122096008.0U CN215986428U (en) | 2021-09-01 | 2021-09-01 | Generator rotor turn-to-turn short circuit detection device based on repetitive pulse RSO method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122096008.0U CN215986428U (en) | 2021-09-01 | 2021-09-01 | Generator rotor turn-to-turn short circuit detection device based on repetitive pulse RSO method |
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| CN215986428U true CN215986428U (en) | 2022-03-08 |
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| CN202122096008.0U Active CN215986428U (en) | 2021-09-01 | 2021-09-01 | Generator rotor turn-to-turn short circuit detection device based on repetitive pulse RSO method |
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