CN111082395A - Three-phase asynchronous motor on-line detection protection system - Google Patents
Three-phase asynchronous motor on-line detection protection system Download PDFInfo
- Publication number
- CN111082395A CN111082395A CN201911425155.9A CN201911425155A CN111082395A CN 111082395 A CN111082395 A CN 111082395A CN 201911425155 A CN201911425155 A CN 201911425155A CN 111082395 A CN111082395 A CN 111082395A
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- China
- Prior art keywords
- asynchronous motor
- phase asynchronous
- chip microcomputer
- single chip
- detection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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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
- G01R31/343—Testing dynamo-electric machines in operation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/045—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a thermal radiation sensor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0852—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load directly responsive to abnormal temperature by using a temperature sensor
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Electric Motors In General (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
The invention discloses an online detection protection system of a three-phase asynchronous motor, which comprises a detection device, a single chip microcomputer, an A/D converter, an execution device and a detection control circuit, wherein the detection device, the single chip microcomputer, the A/D converter, the execution device and the three-phase asynchronous motor are all connected in the detection control circuit; the single chip microcomputer is in signal connection with the detection device, the reminding device and the execution device, and is a control center of the system; the A/D converter is connected between the detection device and the single chip microcomputer, the A/D converter is used for converting detected analog signals into digital signals and transmitting the digital signals to the single chip microcomputer, the execution device comprises a relay and an alarm device, the relay and the alarm device are both connected with the single chip microcomputer, various parameters of the three-phase asynchronous motor during operation are detected and monitored, and the three-phase asynchronous motor is tested and protected under the mutual cooperation of the detection device and the execution device.
Description
Technical Field
The invention relates to the technical field of motor equipment, in particular to an online detection and protection system for a three-phase asynchronous motor.
Background
The damage of a plurality of three-phase asynchronous motors is caused by the burning of stator windings due to an electrical system, the burning of the stator windings has various conditions, namely, the burning of a single-turn winding, the burning of a single-phase winding, the burning of a two-phase winding and the burning of all three-phase windings; the different burning causes are different, and the main reasons of burning are combined: 1) the insulation of the three-phase asynchronous motor is reduced; 2) the three-phase asynchronous motor runs in a phase-loss mode; 3) overload operation of the three-phase asynchronous motor; 4) the temperature is too high due to poor ventilation of the three-phase asynchronous motor; 5) when a disconnecting link switch is used as a load switch, the disconnecting link three-phase asynchronous motor is burnt due to the fact that the disconnecting link three-phase asynchronous motor is locked and rotated because the disconnecting link three-phase asynchronous motor is forgotten to be switched off when power is cut off; 6) over-voltage or under-voltage operation; therefore, a detection protection system is needed to be designed, which can timely cut off the power when the three-phase asynchronous motor has an electrical system fault, and remind a user of timely maintenance and inspection.
Disclosure of Invention
Based on the technical problems in the prior art, the invention provides an online detection and protection system for a three-phase asynchronous motor, which can detect and monitor various parameters of the three-phase asynchronous motor during operation, and test and protection of the three-phase asynchronous motor are completed under the mutual cooperation of a detection device and an execution device.
The invention provides an online detection protection system for a three-phase asynchronous motor, which comprises a detection device, a single chip microcomputer, an A/D converter, an execution device and a detection control circuit, wherein the detection device, the single chip microcomputer, the A/D converter, the execution device and the three-phase asynchronous motor are all connected in the detection control circuit; the single chip microcomputer is in signal connection with the detection device, the reminding device and the execution device, and is a control center of the system; the A/D converter is connected between the detection device and the single chip microcomputer, the A/D converter is used for converting analog signals detected by the detection device into digital signals and transmitting the digital signals to the single chip microcomputer, the execution device comprises a relay and an alarm device, and the relay and the alarm device are both connected with the single chip microcomputer.
The adopted disconnecting switch is an isolating switch.
The alarm device comprises an alarm lamp and an electric horn, and the alarm lamp and the electric horn are connected with the relay and the single chip microcomputer.
The alarm device further comprises a display screen, and the display screen is connected with the voltage detection device, the current detection device, the temperature sensor and the rotating speed sensor.
The detection control circuit comprises an operational amplification circuit, a driving circuit, a working circuit and a display circuit.
The current detection device is a current transformer.
And the operational amplification circuit is also provided with a resistor.
And a voltage stabilizing diode is also arranged in the operational amplification circuit.
The on-line detection protection system for the three-phase asynchronous motor provided by the invention has the advantages that: the invention provides an online detection protection system for a three-phase asynchronous motor, which is mainly used for monitoring the temperature, voltage and current changes of the three-phase asynchronous motor; the three-phase voltage of the stator winding end of the three-phase asynchronous motor is detected by a voltage detection device in the detection device, the detected voltage value is sent to a single chip microcomputer for analysis after being converted by an A/D converter, the single chip microcomputer analyzes and determines whether each voltage value is within the range of rated voltage of the three-phase asynchronous motor, the safe operation of the three-phase asynchronous motor is ensured, and if the voltage value exceeds the range, a command is sent to an execution device to protect the three-phase asynchronous motor from being burnt due to voltage defect, so that the three-phase asynchronous motor can safely operate; the temperature sensor in the alarm device is arranged to detect the temperature of the three-phase asynchronous motor during working, a temperature signal is sent to the single chip microcomputer, and when the temperature exceeds a certain range value, the single chip microcomputer sends a command through analysis to control the three-phase asynchronous motor to stop; the rotating speed of the three-phase asynchronous motor is detected by a rotating speed sensor in the alarm device so as to prevent the three-phase asynchronous motor from being burnt out due to the locked rotor.
Drawings
Fig. 1 is a schematic structural diagram of an online detection protection system for a three-phase asynchronous motor according to the present invention.
Detailed Description
As shown in fig. 1, fig. 1 is an online detection and protection system for a three-phase asynchronous motor, which is disclosed by the invention, and can detect and monitor various parameters of the three-phase asynchronous motor during operation, and complete the test and protection of the three-phase asynchronous motor under the mutual cooperation of a detection device and an execution device.
Referring to fig. 1, the on-line detection protection system for the three-phase asynchronous motor provided by the invention comprises a detection device, a single chip microcomputer, an a/D converter, an execution device and a detection control circuit, wherein the detection device, the single chip microcomputer, the a/D converter, the execution device and the three-phase asynchronous motor are all connected in the detection control circuit; the single chip microcomputer is in signal connection with the detection device, the reminding device and the execution device, and is a control center of the system; the A/D converter is connected between the detection device and the single chip microcomputer, the A/D converter is used for converting an analog signal detected by the detection device into a digital signal and transmitting the digital signal to the single chip microcomputer, the single chip microcomputer analyzes, calculates and compares a voltage signal, a current signal, a temperature signal and a rotating speed signal detected by the detection device, judges whether the three-phase asynchronous motor is in a normal working state or not, sends a corresponding command to enable the execution device to work so as to prevent the three-phase asynchronous motor from being damaged, and simultaneously, the single chip microcomputer is also used for storing the current, the voltage and the temperature values in each process of the three-phase asynchronous motor so that maintenance personnel can find the fault reason of the three-phase asynchronous motor in time and sends an alarm signal to the reminding device to remind a user of overhauling the three-phase; the execution device comprises a relay and an alarm device, and the relay and the alarm device are both connected with the single chip microcomputer. The relay connects or disconnects the AC contactor of the three-phase asynchronous motor according to a command sent by the singlechip, so that the three-phase asynchronous motor is prevented from being burnt.
The adopted disconnecting switch is an isolating switch. If the common knife switch is adopted, the three-phase asynchronous motor is blocked and burnt out because the switch is forgotten to be switched off when power failure occurs.
The alarm device comprises an alarm lamp and an electric horn, and the alarm lamp and the electric horn are connected with the relay and the single chip microcomputer. The alarm lamp and the electric horn are arranged to give an alarm respectively from the light and the electricity, and a worker is reminded to check the alarm reason of the three-phase asynchronous motor.
The alarm device further comprises a display screen, and the display screen is connected with the voltage detection device, the current detection device, the temperature sensor and the rotating speed sensor. The display screen is used for displaying the working state of the three-phase asynchronous motor detected by the detection device and displaying the working current voltage, the working temperature and the rotating speed of the three-phase asynchronous motor, so that maintenance personnel can be helped to analyze the working condition of the three-phase asynchronous motor.
The detection control circuit comprises an operational amplification circuit, a driving circuit, a working circuit and a display circuit. The detection device is arranged in the operational amplification circuit; the single chip microcomputer is arranged in the driving circuit; the relay, the alarm lamp and the electric horn in the A/D converter and the execution device are arranged in a working circuit; the display screen is arranged in the display circuit.
The current detection device is a current transformer.
And the operational amplification circuit is also provided with a resistor. The current signal detected by the current transformer is converted into a voltage signal through the resistor and then sent to the analog-to-digital converter, and the voltage signal is converted into a digital signal through the analog-to-digital converter and then sent to the inside of the single chip microcomputer for processing.
And a voltage stabilizing diode is also arranged in the operational amplification circuit. The voltage signal sampled by the voltage detection device is stabilized by the voltage stabilizing diode, then transmitted to the A/D converter, and finally converted into a digital signal to be sent to the inside of the single chip microcomputer for processing.
In summary, the online detection protection system for the three-phase asynchronous motor provided in the structure of the present invention is mainly used for monitoring the temperature, voltage and current changes of the three-phase asynchronous motor; the three-phase voltage of the stator winding end of the three-phase asynchronous motor is detected by a voltage detection device in the detection device, the detected voltage value is sent to a single chip microcomputer for analysis after being converted by an A/D converter, the single chip microcomputer analyzes and determines whether each voltage value is within the range of rated voltage of the three-phase asynchronous motor, the safe operation of the three-phase asynchronous motor is ensured, and if the voltage value exceeds the range, a command is sent to an execution device to protect the three-phase asynchronous motor from being burnt due to voltage defect, so that the three-phase asynchronous motor can safely operate; the temperature sensor in the alarm device is arranged to detect the temperature of the three-phase asynchronous motor during working, a temperature signal is sent to the single chip microcomputer, and when the temperature exceeds a certain range value, the single chip microcomputer sends a command through analysis to control the three-phase asynchronous motor to stop; the rotating speed of the three-phase asynchronous motor is detected by a rotating speed sensor in the alarm device so as to prevent the three-phase asynchronous motor from being burnt out due to the locked rotor.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention by equivalent replacement or change according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (8)
1. The on-line detection protection system for the three-phase asynchronous motor is characterized by comprising a detection device, a single chip microcomputer, an A/D converter, an execution device and a detection control circuit, wherein the detection device, the single chip microcomputer, the A/D converter, the execution device and the three-phase asynchronous motor are all connected in the detection control circuit; the single chip microcomputer is in signal connection with the detection device, the reminding device and the execution device, and is a control center of the system; the A/D converter is connected between the detection device and the single chip microcomputer, the A/D converter is used for converting analog signals detected by the detection device into digital signals and transmitting the digital signals to the single chip microcomputer, the execution device comprises a relay and an alarm device, and the relay and the alarm device are both connected with the single chip microcomputer.
2. An on-line detection and protection system for a three-phase asynchronous motor according to claim 1, wherein the knife switch is a disconnecting switch.
3. The on-line detection and protection system for the three-phase asynchronous motor according to claim 1, wherein the alarm device comprises an alarm lamp and an electric horn, and the alarm lamp and the electric horn are connected with the relay and the single chip microcomputer.
4. The on-line detection protection system for the three-phase asynchronous motor according to claim 1, wherein the alarm device further comprises a display screen, and the display screen is connected with the voltage detection device, the current detection device, the temperature sensor and the rotating speed sensor.
5. The on-line detection protection system for the three-phase asynchronous motor according to claim 1, wherein the detection control circuit comprises an operational amplifier circuit, a driving circuit, a working circuit and a display circuit.
6. The on-line detection protection system for the three-phase asynchronous motor according to claim 4, wherein the current detection device is a current transformer.
7. The on-line detection protection system for the three-phase asynchronous motor according to claim 1, wherein a resistor is further arranged in the operational amplifier circuit.
8. An on-line detection and protection system for a three-phase asynchronous motor according to claim 1, wherein a voltage stabilizing diode is further arranged in the operational amplification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911425155.9A CN111082395A (en) | 2019-12-31 | 2019-12-31 | Three-phase asynchronous motor on-line detection protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911425155.9A CN111082395A (en) | 2019-12-31 | 2019-12-31 | Three-phase asynchronous motor on-line detection protection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111082395A true CN111082395A (en) | 2020-04-28 |
Family
ID=70321514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911425155.9A Pending CN111082395A (en) | 2019-12-31 | 2019-12-31 | Three-phase asynchronous motor on-line detection protection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111082395A (en) |
-
2019
- 2019-12-31 CN CN201911425155.9A patent/CN111082395A/en active Pending
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Application publication date: 20200428 |