CN111381136A - Device for detecting insulation of high-voltage motor on line - Google Patents
Device for detecting insulation of high-voltage motor on line Download PDFInfo
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- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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Abstract
The application relates to a device for on-line measuring high-voltage motor is insulating, includes: the device comprises a high-voltage isolation unit, a voltage output unit, a measuring unit, a control unit and a data transmission unit; the voltage output unit is used for outputting a preset voltage signal to the high-voltage motor loop; the measurement unit is used for detecting the zero sequence current of the ABC three-phase cable, converting the zero sequence current into zero sequence voltage and sending the zero sequence voltage to the control unit; the control unit is used for carrying out digital filtering, sampling, analysis and calculation on the zero-sequence voltage to obtain insulation resistance and state information; and the data transmission unit is used for transmitting the insulation resistance and the state information to the master station and the client. In the embodiment of the application, the detection can be realized in the running and shutdown standby states, and the detection efficiency is favorably improved; the state information can be generated according to the insulation resistance, early warning and alarming on the insulation state are achieved, and timely maintenance is facilitated for users.
Description
Technical Field
The application relates to the technical field of high-voltage detection, in particular to a device for detecting insulation of a high-voltage motor on line.
Background
The main causes of power system failure include insulation damage, and therefore, in some scenarios, enhanced insulation detection is required. Taking insulation detection of a high-voltage motor as an example, insulation of the motor is reduced due to mechanical abrasion, thermal aging and the like, in order to avoid major accidents, the high-voltage motor can only be shut down in the related technology, and after power failure and outage, the insulation is measured by tools such as a manual megger or a digital megohmmeter, so that the production progress is influenced, more manpower is required to be occupied, and the detection efficiency is lower.
Disclosure of Invention
The application provides a device for on-line measuring high-voltage motor is insulating to solve the not enough of correlation technique.
According to the embodiment of the application, the device for detecting the insulation of the high-voltage motor on line comprises: the device comprises a high-voltage isolation unit, a voltage output unit, a measuring unit, a control unit and a data transmission unit; wherein,
the voltage output unit is used for outputting a preset voltage signal to the high-voltage motor loop;
the measurement unit is used for detecting the zero sequence current of the ABC three-phase cable, converting the zero sequence current into zero sequence voltage and sending the zero sequence voltage to the control unit;
the control unit is used for carrying out digital filtering, sampling, analysis and calculation on the zero sequence voltage to obtain insulation resistance and state information; the state information comprises alarm information generated when the insulation resistance is smaller than a preset resistance value and safety information generated when the insulation resistance is larger than or equal to the preset resistance value;
and the data transmission unit is used for transmitting the insulation resistance and the state information to the master station and the client.
Optionally, the measurement unit comprises a zero sequence transformer unit, an operational amplifier, an inverter and an integrating AD converter;
the zero sequence transformer unit is used for detecting the zero sequence current of the ABC three-phase cable; the zero sequence current is used as leakage current of the high-voltage motor;
the operational amplifier is used for converting the zero-sequence current into an analog zero-sequence voltage signal;
the phase inverter is used for shaping the analog zero-sequence voltage signal to output preset specified voltage;
the integral AD converter is used for converting the specified voltage into a digital zero-sequence voltage signal.
Optionally, the integrating AD converter is implemented by an ICL7106 chip or by an AD converter within STM 32.
Optionally, the voltage output unit includes a high-voltage switch, a pulse width modulator, a step-up transformer, and a rectification filter circuit;
the high-voltage switch is used for being closed when a linkage closing signal is received;
the pulse width modulator is connected with the high-voltage switch and is used for modulating direct-current low voltage into a pulse width modulation signal when the high-voltage switch is closed;
the boosting transformer is connected with the pulse width modulator and is used for converting the pulse width modulation signal into a high-voltage pulse signal;
the rectification filter circuit is connected with the boosting transformer and used for converting the high-voltage pulse signal into direct-current high voltage, and the direct-current high voltage is used as a preset voltage signal.
Optionally, the amplitude of the preset voltage signal is 2000V to 3000V.
Optionally, the high voltage switch is further configured to open when no gang close signal is received.
Optionally, the controller of the pulse width modulator employs at least one of the following control chips: UC3840, TL494 and SG 3524.
Optionally, the data transmission unit includes one of: MAX1480B interface, 4G IoT module EC 20.
Optionally, the device further comprises a display unit, and the display unit is used for displaying the currently detected insulation resistance and state information.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
according to the embodiment, the detection can be realized in the running and shutdown standby states, and the detection efficiency is improved; state information can be generated according to the insulation resistance, early warning and alarming on the insulation state are achieved, and timely maintenance is facilitated for users; and the insulation resistance and the state information can be sent to the master station, so that the master station can analyze the insulation state by combining historical data.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a block diagram illustrating a high voltage isolation device for high voltage motor insulation monitoring according to an exemplary embodiment.
FIG. 2 is a diagram illustrating a scenario according to an example embodiment.
Fig. 3 is a block diagram illustrating a high voltage output unit according to an exemplary embodiment.
Fig. 4 is a block diagram illustrating a high voltage isolation unit in accordance with an exemplary embodiment.
Fig. 5 is a block diagram illustrating a high voltage isolation unit in accordance with an exemplary embodiment.
FIG. 6 is a block diagram illustrating a measurement unit in accordance with an exemplary embodiment.
FIG. 7 is a block diagram illustrating a system for obtaining insulation resistance in accordance with an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. Rather, they are merely examples of devices consistent with certain aspects of the present application, as detailed in the appended claims.
The main causes of power system failure include insulation damage, and therefore, in some scenarios, enhanced insulation detection is required. Taking insulation detection of a high-voltage motor as an example, insulation of the motor is reduced due to mechanical abrasion, thermal aging and the like, in order to avoid major accidents, the high-voltage motor can only be shut down in the related technology, and after power failure and outage, the insulation is measured by tools such as a manual megger or a digital megohmmeter, so that the production progress is influenced, more manpower is required to be occupied, and the detection efficiency is lower.
In order to solve the technical problem, an embodiment of the present application provides an apparatus for online detection of insulation of a high-voltage motor, fig. 1 is a block diagram of an apparatus for online detection of insulation of a high-voltage motor according to an exemplary embodiment, and fig. 2 is a scene diagram according to an exemplary embodiment. Referring to fig. 1, an apparatus for on-line testing insulation of a high voltage motor includes: the device comprises a control unit 11, a high-voltage output unit 12, a high-voltage isolation unit 13, a measurement unit 14 and a data transmission unit; wherein,
the high-voltage isolation unit 13 is connected to the ABC three-phase cables of the high-voltage motor, respectively, and is configured to isolate that the high voltage on the ABC three-phase cables is transmitted to the high-voltage cable far away from the high-voltage motor, that is, the high voltage on the ABC three-phase cables cannot be transmitted to the device for detecting the insulation of the high-voltage motor on line provided in this embodiment, so as to protect the on-line device.
The voltage output unit 12 is used for outputting a preset voltage signal to the high-voltage motor loop;
the measurement unit 14 is configured to detect a zero sequence current of the ABC three-phase cable, convert the zero sequence current into a zero sequence voltage, and send the zero sequence voltage to the control unit 11;
the control unit 11 is used for performing digital filtering, sampling, analysis and calculation on the zero sequence voltage to obtain insulation resistance and state information; the state information includes alarm information generated when the insulation resistance is less than a preset resistance value and safety information generated when the insulation resistance is greater than or equal to the preset resistance value;
and the data transmission unit 15 is used for transmitting the insulation resistance and the state information to the main station and the client, so that a user can conveniently check and analyze the insulation resistance and the state information, the occurrence and the development of fault hidden dangers can be judged according to early warning and alarm signals, and the occurrence of major accidents caused by insulation reduction is avoided.
In one embodiment, referring to fig. 3, the high voltage output unit 12 includes a high voltage switch 121, a pulse width modulator 122, a step-up transformer 123, and a rectifying and filtering circuit 124. Wherein,
the high-voltage switch 121 is configured to be closed to form a detection loop when receiving the ganged close signal, and to be opened to achieve electrical isolation when not receiving the ganged close signal.
The pulse width modulator 122 is connected to the high voltage switch 121, and is configured to modulate the dc low voltage into a pulse width modulation signal when the high voltage switch 121 is closed. The controller of the pulse width modulator adopts at least one of the following control chips: UC3840, TL494 and SG 3524.
The step-up transformer 123 is connected to the pulse width modulator 122, and is configured to convert the pulse width modulated signal into a high-voltage pulse signal. The operation principle of the step-up transformer can refer to the related art, and is not limited herein.
The rectifying and filtering circuit 124 is connected to the step-up transformer 123, and is configured to perform rectifying and filtering on the high-voltage pulse signal, so as to convert the high-voltage pulse signal into a dc high voltage, and use the dc high voltage as a preset voltage signal. In this embodiment, the preset voltage signal is a high voltage signal of 2000V to 3000V. In one example, the preset voltage signal is a 2500V voltage signal, and the insulation resistance of the high-voltage motor is reduced by increasing the detection voltage, so that a prepared detection result is obtained.
The linkage close signal may be a trigger signal for the user control device to start detecting the insulation resistance, a trigger signal generated by the device according to the operating state of the high-voltage motor, or a trigger signal generated by the control unit 11, and may be set according to a specific scene, which is not limited herein.
Taking the trigger signal generated according to the operating state of the high voltage motor as an example, an apparatus for online detection of insulation of the high voltage motor further includes a signal blocking unit 16. The signal blocking unit 16 may be formed by an electronic device such as a relay or a transistor, and is configured to determine whether to output a detection linkage closing signal according to the trolley position information and the opening/closing information of the circuit breaker. For example, the signal blocking unit 16 can acquire the real-time position of the circuit breaker dolly and the circuit breaker divide-shut brake signal from the normally closed auxiliary contact of the circuit breaker body, and if the circuit breaker dolly is in operating condition this moment, the divide-shut brake signal is the separating brake state, and it can be determined that the high-voltage motor is in the outage state this moment, then provides linkage closed signal for the high-voltage output unit, and wherein linkage closed signal can include: and detecting a closing signal and a closing signal of the loop. On the contrary, if the breaker is in a closing state. The circuit breaker body normally closed auxiliary contact is in suction disconnection, the signal locking unit does not output linkage closing signals at the moment, the high-voltage output unit does not have a closed loop and closing signals, and therefore the circuit breaker can not work, locking isolation can be achieved, and electrified misoperation is avoided.
In another embodiment, the signal locking unit 16 may directly provide the trolley position information and the opening/closing information as a linkage closing signal to the high voltage output unit 12, and the high voltage output unit 12 determines the closing signal and the closing signal of the loop according to the trolley position information and the opening/closing information, and may also achieve the effect of controlling whether the high voltage output unit 12 outputs the preset voltage signal, and the corresponding scheme falls within the protection scope of the present application.
In an embodiment, the high voltage isolation unit 13 may include: the device comprises a resistor with preset numerical values, an isolating switch, a voltage protector and a high-voltage online detection device. Referring to fig. 4, the high voltage isolation unit includes a resistor a, a resistor B, a resistor C, an isolation switch, and a voltage protector; the other ends of the resistor A, the resistor B and the resistor C are connected to one end of the isolating switch respectively, and the other end of the isolating switch is connected to the voltage protector. The preset value can be adjusted according to the input voltage of the high-voltage motor, for example, the resistance value is 15M omega, the preset value is used for isolating the high voltage of the ABC phase cable, the interphase current can be effectively reduced, the interphase short circuit is avoided, and the protection effect on the equipment is achieved; the isolating switch can adopt a reed switch high-voltage relay, and high-voltage secondary isolation is realized by controlling an auxiliary contact of a high-voltage motor; the voltage protector is used for protecting the high-voltage module, preventing impact and preventing current backflow and the like.
In practical application, the connection part of the high-voltage isolation unit and the ABC three-phase cable can be a high-voltage motor and a bolt of the ABC three-phase cable, so that the high-voltage isolation unit is convenient to mount. That is, the high voltage isolation unit may be directly fixed to the junction of the ABC three-phase cable.
In an embodiment, referring to fig. 5, the high voltage isolation unit 13 may further include an online detection module. The online detection module is used for detecting whether the high-voltage motor is in an operating state, and if the high-voltage motor is in the operating state, the isolating switch in the high-voltage isolating unit is disconnected through detecting the auxiliary contact of the motor, so that isolation is realized.
In an embodiment, referring to fig. 6, the measurement unit 14 comprises a zero sequence transformer unit, an operational amplifier, an inverter and an integrating AD converter;
the zero sequence transformer unit can detect the zero sequence current of the ABC three-phase cable of the high-voltage motor. The zero sequence current can reflect whether the ABC three-phase cable has the problem of insulation damage or not, for example, when the zero sequence current is detected to be not zero, the problem that at least one phase of the ABC three-phase cable has insulation damage is shown, and when the zero sequence current is detected to be the zero sequence, the problem that the ABC three-phase cable does not have insulation damage is shown.
The operational amplifier is used for converting the zero sequence current into an analog zero sequence voltage signal;
the phase inverter is used for shaping the analog zero-sequence voltage signal to output a preset designated voltage, and is used for shaping the analog zero-sequence voltage signal to output a preset designated voltage. For example, when the level (i.e. the zero sequence voltage signal) output by the preceding operational amplifier is not a standard level or the waveform is not ideal, the inverter may shape the zero sequence voltage signal and change the zero sequence voltage signal into a preset specified voltage. Meanwhile, the phase inverter can also perform logical inversion on the input voltage or form a phase inverter chain to enhance the load capacity of the logic gate and reduce the time delay.
And the integrating AD converter is used for converting the specified voltage into a digital zero-sequence voltage signal. The integration AD converter adopts an ICL7106 chip, the conversion accuracy reaches +/-0.05%, and the integration AD converter has the functions of automatic zero setting, automatic polarity judgment and the like; alternatively, with an AD converter within STM32, the sampling accuracy can reach 12-bit accuracy.
It should be noted that, in order to obtain weak signals in clutter, the algorithm in the measurement unit 14 may adopt filtering methods of fourier transform and wavelet transform. For example, fourier transform is a frequency domain analysis of a signal from the time domain, and is generally used for the analysis of continuous signals; the wavelet analysis is a local transformation of time and frequency, can effectively extract information from signals, and performs multi-scale refinement analysis (multiscale analysis) on functions or signals through operation functions such as stretching and translation. The weak signals are processed by methods such as Fourier transform, wavelet analysis and the like, so that the signal-to-noise ratio can be improved, and the separation and detection of the weak signals can be realized. That is, in this embodiment, the fundamental wave and the harmonic wave separated from the harmonic current and the harmonic signal in the power grid may be obtained by the filtering method, and the harmonic current is monitored according to the amplitude, the current distortion rate, the power factor, and the power loss of each harmonic component, so as to finally obtain the steady-state signal and the transient-state signal. Wherein the steady state is the zero sequence voltage signal.
In one embodiment, control unit 11 may employ an STM32 family microprocessor to acquire digital voltage signals from measurement unit 14, and to digitally filter, sample, analyze, and calculate the voltage signals to obtain insulation resistance and state information.
In this embodiment, the insulation resistance measurement may include the following processes:
the insulation resistance is measured by adopting DC-DC conversion to generate 2500V high voltage, the high voltage is connected into a system to be measured, an accurate insulation resistance value is obtained through an I-V conversion circuit, an inverter, integral AD conversion and digital filtering, data are displayed through a liquid crystal display, and a system scheme diagram is specifically obtained and is shown in figure 7.
1. Current-to-voltage converter (I-to-V conversion):
an I-V conversion circuit is formed by a resistor Rx to be tested, a feedback resistor Rf and an operational amplifier A1. The I-V conversion circuit converts the current flowing through the insulation resistor Rx to be tested into a voltage signal and outputs the voltage signal. When the test voltage Vi acts on the resistor Rx to be tested, according to the characteristics of the operational amplifier, the positive input terminal thereof is at ground potential, and then the negative input terminal (test terminal-) is also at ground potential (virtual ground), which can be derived from ohm's law:
Io＝Vi/Rx (1)
therefore, the output voltage of the operational amplifier:
Vo＝-Io*Rf (2)
substituting formula (1) into formula (2) to obtain:
Vo＝-Vi*Rf/Rx (3)
vo after inversion:
Vref＝-Vo＝Vi*Rf/Rx (4)
as can be seen from the equation (4), Vo and Rx are in inverse proportion, so that the larger the resistor Rx to be tested is, the smaller Vo is at the same test voltage. The measurement accuracy of an instrument directly related to the accuracy of an I-V conversion circuit is high in resistance value of a measured insulation resistor, so that an operational amplifier with low offset voltage, low drift voltage and high accuracy is required to be selected, and chopping operation amplification is often used.
2. Analog-to-digital converter (A/D) and digital analysis filtering
The analog-digital converter adopts a double-integral AD conversion chip ICL7106, and the display value is as follows according to the characteristics of ICL 7106:
N＝1000*Vin/Vref (5)
as can be seen from fig. 7:
Vin＝Vi*R2/(R1+R2) (6)
substituting the formulas (4) and (6) into the formula (5) can obtain:
N＝1000*R2/Rf(R1+R2)*Rx
when k is R2/Rf (R1+ R2), we can obtain:
N＝1000*k*Rx (7)
from the formula (7): as long as a proper k value is selected, ICL7106 displays that the value N is equal to the value of the insulation resistance Rx to be measured, and A/D conversion is completed.
The control unit 11 may analyze and filter the obtained a/D value by fourier transform and wavelet transform to obtain the insulation resistance value. Of course, the ICL7106 may be used as a part of the control unit, and in this case, the displayed value N may be used as the insulation resistance value.
Meanwhile, in the embodiment, the absorption ratio (i.e. the ratio of R60s to R15 s) and the polarization index (i.e. the ratio of R10min to R1 min) of the device under test can be measured, and the quality of the insulation condition of the device under test can be more accurately determined according to the data.
In one embodiment, the data transmission unit 15 comprises one of: MAX1480B interface, 4G IoT module EC 20.
The wired communication can adopt MAX1480B, MAX1480B is a complete electrical isolation type RS485/RS232 data communication interface scheme, and a hybrid microcircuit structure is adopted. The EMI can be reduced to the maximum extent.
The wireless communication adopts a 4G IOT module EC20 of Shanghai Mobile telecommunication technology, Inc., EC 20R 2.1 is an LTE Cat 4 wireless communication module proposed by the Mobile telecommunication, adopts the LTE 3GPP Rel.11 technology, supports the maximum downlink rate of 150Mbps and the maximum uplink rate of 50Mbps, and realizes seamless switching between a 3G network and a 4G network.
It should be noted that the data transmission unit adopts multiple transmission technologies, and can realize wired connection (such as RS485 and network cable connection) and wireless connection, so that the embodiment can introduce the 4G technology and the internet of things technology into the device, and can realize statistics, storage, analysis and mining of data, find out insulation weak points in time, perform early warning and analysis, and realize intelligent detection by relying on a big data platform.
In one embodiment, the high voltage isolation device further comprises a display unit, and the display unit can display the currently detected insulation resistance and state information so as to facilitate a user to detect the high voltage motor on site.
So far, this application has following advantage and beneficial effect:
1) the real-time detection of the insulation state can be realized, and the detection can be realized in the running and shutdown standby states.
2) The early warning and the alarm of the insulation state can be realized.
3) The user can call and compare the historical data at any time, and a basis can be provided for maintenance. .
4) The insulation state of the high-voltage motor is mastered in real time by combining the Internet of things and big data analysis, and data analysis, prediction and alarm can be realized.
5) Convenient maintenance, safety and reliability.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (9)
1. A device for on-line testing high-voltage motor insulation, comprising: the device comprises a high-voltage isolation unit, a voltage output unit, a measuring unit, a control unit and a data transmission unit; wherein,
the high-voltage isolation unit is respectively connected with an ABC three-phase cable of the high-voltage motor and is used for isolating the high voltage on the ABC three-phase cable from being transmitted to the high-voltage cable far away from one side of the high-voltage motor;
the voltage output unit is used for outputting a preset voltage signal to the high-voltage motor loop;
the measurement unit is used for detecting the zero sequence current of the ABC three-phase cable, converting the zero sequence current into zero sequence voltage and sending the zero sequence voltage to the control unit;
the control unit is used for carrying out digital filtering, sampling, analysis and calculation on the zero sequence voltage to obtain insulation resistance and state information; the state information comprises alarm information generated when the insulation resistance is smaller than a preset resistance value and safety information generated when the insulation resistance is larger than or equal to the preset resistance value;
and the data transmission unit is used for transmitting the insulation resistance and the state information to the master station and the client.
2. The apparatus of claim 1, wherein the measurement unit comprises a zero sequence transformer unit, an operational amplifier, an inverter and an integrating AD converter;
the zero sequence transformer unit is used for detecting the zero sequence current of the ABC three-phase cable; the zero sequence current is used as leakage current of the high-voltage motor;
the operational amplifier is used for converting the zero-sequence current into an analog zero-sequence voltage signal;
the phase inverter is used for shaping the analog zero-sequence voltage signal to output preset specified voltage;
the integral AD converter is used for converting the specified voltage into a digital zero-sequence voltage signal.
3. The apparatus of claim 2, wherein the integrating AD converter is an ICL7106 chip or an AD converter in STM 32.
4. The apparatus of claim 1, wherein the voltage output unit comprises a high voltage switch, a pulse width modulator, a step-up transformer, and a rectifying and filtering circuit;
the high-voltage switch is used for being closed when a linkage closing signal is received;
the pulse width modulator is connected with the high-voltage switch and is used for modulating direct-current low voltage into a pulse width modulation signal when the high-voltage switch is closed;
the boosting transformer is connected with the pulse width modulator and is used for converting the pulse width modulation signal into a high-voltage pulse signal;
the rectification filter circuit is connected with the boosting transformer and used for converting the high-voltage pulse signal into direct-current high voltage, and the direct-current high voltage is used as a preset voltage signal.
5. The apparatus of claim 4, wherein the predetermined voltage signal has an amplitude of 2000V to 3000V.
6. The device of claim 4, wherein the high voltage switch is further configured to open when a gang close signal is not received.
7. The apparatus of claim 4, wherein the controller of the pulse width modulator employs at least one of the following control chips: UC3840, TL494 and SG 3524.
8. The apparatus of claim 1, wherein the data transmission unit comprises one of: MAX1480B interface, 4GIoT module EC 20.
9. The apparatus of claim 1, further comprising a display unit for displaying the insulation resistance and the state information currently detected.
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| CN202010414502.4A CN111381136A (en) | 2020-05-15 | 2020-05-15 | Device for detecting insulation of high-voltage motor on line |
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| CN202010414502.4A CN111381136A (en) | 2020-05-15 | 2020-05-15 | Device for detecting insulation of high-voltage motor on line |
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| CN202010414502.4A Withdrawn CN111381136A (en) | 2020-05-15 | 2020-05-15 | Device for detecting insulation of high-voltage motor on line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111381136A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965498A (en) * | 2020-07-22 | 2020-11-20 | 东方电气集团东方电机有限公司 | Automatic inspection and fault positioning device for insulation state of hydraulic generator screw |
| CN113092999A (en) * | 2021-04-02 | 2021-07-09 | 中国第一汽车股份有限公司 | Switching value input diagnosis device and diagnosis method |
| CN113589122A (en) * | 2021-08-14 | 2021-11-02 | 东莞市乾博电子科技有限公司 | Automatic insulation detection system and detector for high-voltage motor winding |
-
2020
- 2020-05-15 CN CN202010414502.4A patent/CN111381136A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965498A (en) * | 2020-07-22 | 2020-11-20 | 东方电气集团东方电机有限公司 | Automatic inspection and fault positioning device for insulation state of hydraulic generator screw |
| CN111965498B (en) * | 2020-07-22 | 2023-01-24 | 东方电气集团东方电机有限公司 | Automatic inspection and fault positioning device for insulation state of hydraulic generator screw |
| CN113092999A (en) * | 2021-04-02 | 2021-07-09 | 中国第一汽车股份有限公司 | Switching value input diagnosis device and diagnosis method |
| CN113589122A (en) * | 2021-08-14 | 2021-11-02 | 东莞市乾博电子科技有限公司 | Automatic insulation detection system and detector for high-voltage motor winding |
| CN113589122B (en) * | 2021-08-14 | 2024-03-15 | 东莞市乾博电子科技有限公司 | Automatic insulation detection system and detector for high-voltage motor winding |
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Application publication date: 20200707 |