CN115308488A - Online motor insulation automatic detection device and method - Google Patents
Online motor insulation automatic detection device and method Download PDFInfo
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- CN115308488A CN115308488A CN202110487188.7A CN202110487188A CN115308488A CN 115308488 A CN115308488 A CN 115308488A CN 202110487188 A CN202110487188 A CN 202110487188A CN 115308488 A CN115308488 A CN 115308488A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- 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 invention discloses an online motor insulation automatic detection device and method, which comprises a box body, wherein a detection module, a power supply module, a control module and an interface module are arranged in the box body; the detection module comprises a first detection port, a voltage/current withstanding detection circuit, a first microcomputer, a first RS485 communication module, a starting switch, a high-voltage direct-current voltage source, a motor start-stop detection circuit and a second detection port; the control module comprises a second RS485 communication module, a second microcomputer, a third RS485 communication module, an upper computer communication port, an alarm output driving circuit and an alarm output port. The invention saves manpower resources, improves the production automation level, provides a novel detection method and means for motor insulation detection, and is also suitable for other fields needing insulation detection.
Description
Technical Field
The invention belongs to the technical field of insulation detection of low-voltage motors, and particularly relates to an online automatic motor insulation detection device and method.
Background
In industrial production, a large number of electric machines are widely used, the insulation state of the electric machine is an important technical parameter for the operation of the electric machine, and according to relevant regulation standards, before the electric machine is started, the insulation of a rotor winding and a stator winding of the electric machine to the ground (a machine base) and the insulation of phases need to be respectively measured in a cooling state, or the insulation of the rotor winding and the stator winding of the electric machine to the ground and the insulation of phases need to be measured in a heating state of the electric machine (within 10 minutes of the electric machine being stopped).
However, the existing common method is to perform insulation detection by using a megger manual shaking insulation method, the insulation state of the motor needs to be detected manually on site every time the motor is started, at least two workers are needed during measurement, and the measurement data needs to be manually recorded, so that the time and the labor are consumed, and the waste of human resources is brought. Therefore, an online motor insulation automatic detection device and method are provided to solve the problems mentioned in the background technology and meet the requirements of industrial automation and intelligent construction.
Disclosure of Invention
The present invention is directed to an online motor insulation automatic detection device and method, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: an online motor insulation automatic detection device comprises a box body, wherein a detection module, a power supply module, a control module and an interface module are installed in the box body, a display screen and an alarm prompt lamp are arranged on the front surface of the box body, and the interface module is respectively connected with the detection module, the power supply module, the control module, the display screen and the alarm prompt lamp;
the detection module comprises a first detection port, a voltage/current withstanding detection circuit, a first microcomputer, a first RS485 communication module, a starting switch, a high-voltage direct-current voltage source, a motor start-stop detection circuit and a second detection port;
the control module comprises a second RS485 communication module, a second microcomputer, a third RS485 communication module, an upper computer communication port, an alarm output driving circuit and an alarm output port.
The first detection port is connected with the first microcomputer through a voltage-resistant/current detection circuit; the second detection port is connected with the first microcomputer through a motor start-stop detection circuit; one end of the high-voltage direct-current voltage source is connected with the first microcomputer through the starting switch, and the other end of the high-voltage direct-current voltage source is connected with the first detection port; the first microcomputer is connected with the interface module through a first RS485 communication module.
The upper computer communication port is connected with a second microcomputer through a third RS485 communication module; the alarm output port is connected with the second microcomputer through an alarm output driving circuit; and the second microcomputer is connected with the interface module through a second RS485 communication module.
The invention also provides a detection method of the online motor insulation automatic detection device, which specifically comprises the following steps:
s1: connecting a rotor winding, a stator winding and a motor shell of the detected motor into a first detection port, and connecting a working power supply of the detected motor into a second detection port;
s2: judging whether the motor is in a running state or a shutdown state by automatically detecting a power supply voltage signal of the motor, executing the step S3 if the motor is judged to be in the shutdown state, and continuing to execute the step S2 if the motor is judged to be in the running state;
s3: starting an insulation detection program, automatically detecting an insulation value R1 of a motor rotor winding to a motor shell, and judging, outputting and storing the R1;
s4: starting an insulation detection program, automatically detecting an insulation value R2 of a motor stator winding to a motor shell, and judging, outputting and storing the R2;
s5: and the detection data is downloaded through a U disk or a connected computer, and the performance and the safety of the motor are analyzed and evaluated.
Compared with the prior art, the invention has the beneficial effects that: the invention provides an online automatic detection device and method for motor insulation, which save human resources and improve the production automation level, and automatically complete the insulation value detection of a rotor winding and a stator winding of a detected motor on a motor shell respectively by connecting the rotor winding, the stator winding and a motor base of the detected motor into a device, and simultaneously transmit detection data to a monitoring background through RS485 communication, and can also be downloaded through a U disk or a connecting computer on site, thereby greatly saving the investment of human resources and providing the automation level.
The method breaks through the traditional method for measuring the insulation by using the megger, provides a novel detection method and means for detecting the insulation of the motor, and is also suitable for other fields needing insulation detection.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic diagram of a detection module of the present invention;
FIG. 3 is a schematic diagram of a control module of the present invention;
fig. 4 is a schematic diagram of the implementation of the present invention.
In the figure: 10 boxes, 1 detection module, 11 first detection ports, 12 withstand voltage/current detection circuits, 13 first microcomputers, 14 first RS485 communication modules, 15 motor start-stop detection circuits, 16 second detection ports, 17 starting switches, 18 high-voltage direct-current voltage sources, 2 power modules, 3 control modules, 31 second RS485 communication modules, 32 second microcomputers, 33 third RS485 communication modules, 34 upper computer communication ports, 35 alarm output driving circuits, 36 alarm output ports, 4 interface modules, 5 display screens and 6 alarm prompt lamps.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an online automatic motor insulation detection device as shown in figure 1, which comprises a box body 10, wherein a detection module 1, a power module 2, a control module 3 and an interface module 4 are arranged in the box body 10, a display screen 5 and an alarm prompt lamp 6 are arranged on the front surface of the box body 10, and the interface module 4 is respectively connected with the detection module 1, the power module 2, the control module 3, the display screen 5 and the alarm prompt lamp 6.
Referring to fig. 2, the detection module 1 includes a first detection port 11, a voltage/current withstanding detection circuit 12, a first microcomputer 13, a first RS485 communication module 14, a start switch 17, a high voltage dc voltage source 18, a motor start/stop detection circuit 15, and a second detection port 16;
the first detection port 11 is connected to a first microcomputer 13 through a voltage-resistant/current detection circuit 12; the second detection port 16 is connected with the first microcomputer 13 through a motor start-stop detection circuit 15; one end of the high-voltage direct-current voltage source 18 is connected with the first microcomputer 13 through the starting switch 17, and the other end of the high-voltage direct-current voltage source is connected with the first detection port 11; the first microcomputer 13 is connected with the interface module 4 through a first RS485 communication module 14.
Referring to fig. 3, the control module 3 includes a second RS485 communication module 31, a second microcomputer 32, a third RS485 communication module 33, an upper computer communication port 34, an alarm output driving circuit 35, and an alarm output port 36;
the upper computer communication port 34 is connected with the second microcomputer 32 through a third RS485 communication module 33; the alarm output port 36 is connected with the second microcomputer 32 through an alarm output driving circuit 35; the second microcomputer 32 is connected with the interface module 4 through a second RS485 communication module 31.
The invention also provides a detection method of the online motor insulation automatic detection device, which specifically comprises the following steps:
s1: connecting a rotor winding, a stator winding and a motor shell of the detected motor into a first detection port 11, and connecting a working power supply of the detected motor into a second detection port 16;
s2: judging whether the motor is in a running state or a shutdown state by automatically detecting a power supply voltage signal of the motor, executing the step S3 if the motor is judged to be in the shutdown state, and continuing to execute the step S2 if the motor is judged to be in the running state;
s3: starting an insulation detection program, automatically detecting an insulation value R1 of a motor rotor winding to a motor shell, and judging, outputting and storing the R1;
s4: starting an insulation detection program, automatically detecting an insulation value R2 of a motor stator winding to a motor shell, and judging, outputting and storing the R2;
s5: and the detection data is downloaded through the USB flash disk or a connected computer, and the performance and the safety of the motor are analyzed and evaluated.
Referring to fig. 4, further as a preferred embodiment, the insulation detection technical principle of the present invention is as follows: connecting a rotor winding, a stator winding and a motor base of a detected motor into a first detection port 11, and connecting a motor power supply to a second detection port 16;
firstly, the motor start-stop detection circuit 15 sends a motor power supply voltage signal accessed to the second detection port 16 to the first microcomputer 13 to judge the motor start-stop state;
if the first microcomputer 13 judges that the motor is in a shutdown state, the device automatically enters an insulation detection state, a detection lamp of the alarm prompt lamp 6 on the surface of the box body 10 is lighted, the first microcomputer 13 starts the high-voltage direct-current voltage source 18 through the starting switch 17 to generate 500V direct-current voltage and send the voltage to the first detection port 11, and then the voltage resistance value u and the current value i are detected through the voltage resistance/current detection circuit 12 and sent to the first microcomputer 13;
the motor insulation value is obtained after calculation processing according to ohm's law R = u/i, the motor insulation value is sent to the display screen 6 for display through the Rs485 communication module 114 and the interface module 4, the motor insulation value is sent to the second microcomputer 32 through the first RS485 communication module 14, the interface module 4 and the second RS485 communication module 31 to be compared and judged with a set insulation alarm value, then an alarm signal is output through the alarm output driving circuit 35 and the alarm output port 36, meanwhile, an insulation normal lamp or an insulation reduction lamp or an insulation low lamp of the alarm prompt lamp 6 on the surface of the box body 10 is lightened, and the motor insulation value is sent to a remote monitoring background through the third RS485 communication module 33 and the upper computer communication port 34; if the first microcomputer 13 judges that the motor is in the running state, the apparatus is in the standby state.
In this embodiment, the power module 2 is composed of an overvoltage protection circuit, a filter circuit and an AC-DC module, and mainly provides required voltage for the detection module 1, the control module 3, the display screen 5 and the alarm lamp 6.
In this embodiment, the alarm prompt lamp 6 is a 6-way LED alarm prompt, which is running, abnormal in device, detecting, normal in insulation, low in insulation, and too low in insulation, respectively.
In this embodiment, the display screen 5 is a 4.3-inch industrial control touch screen.
In this embodiment, the second microcomputer 32 adopts a TMS320F28335 digital signal processor DSP as a circuit of a core device, and the TMS320F28335 is a 32-bit floating-point DSP processor, which integrates many advanced peripherals, and is powerful and a control platform with superior performance. The system has the advantages of 32-bit operation precision, 150MIPS system processing capacity, floating point operation support, quick interrupt response and processing support, a 256KB Flash memory, an 8KB boot ROM, a 1KB TOP ROM, a 16-channel 12-bit high-speed A/D input channel, four communication interfaces, JTAG boundary scanning interface support, low power consumption and power-saving operation mode. All data conversion and processing, regulation control operation, control decision and the like are completed in a DSP digital signal processor, and a CPLD large-scale programmable logic chip is also adopted in the intelligent controller to complete auxiliary processing of input and output signals.
The device can be connected with a debugging computer or an upper computer through an RS232/RS485 interface, real-time data and compensation control process information are transmitted to the debugging computer or the upper computer, and debugging and operation personnel can conveniently know the actual working condition of the device. The DSP core control processor is a full digital control platform and has good rapidity, stability, flexibility and extensibility.
In conclusion, compared with the prior art, the invention saves human resources, improves the production automation level, automatically completes the insulation value detection of the rotor winding and the stator winding of the detected motor to the motor shell respectively by connecting the rotor winding, the stator winding and the motor base of the detected motor into the device, simultaneously transmits the detection data to the monitoring background through RS485 communication, and can also download through a U disk or a connecting computer on site, thereby greatly saving the investment of human resources and simultaneously providing the automation level.
The method breaks through the traditional method for measuring the insulation by using the megohmmeter, provides a novel detection method and means for detecting the insulation of the motor, and is also suitable for other fields needing insulation detection.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (4)
1. The utility model provides an online motor insulation automatic checkout device, includes box (10), its characterized in that: a detection module (1), a power supply module (2), a control module (3) and an interface module (4) are installed in the box body (10), a display screen (5) and an alarm prompt lamp (6) are arranged on the front face of the box body (10), and the interface module (4) is respectively connected with the detection module (1), the power supply module (2), the control module (3), the display screen (5) and the alarm prompt lamp (6);
the detection module (1) comprises a first detection port (11), a voltage/current withstanding detection circuit (12), a first microcomputer (13), a first RS485 communication module (14), a starting switch (17), a high-voltage direct-current voltage source (18), a motor start-stop detection circuit (15) and a second detection port (16);
the control module (3) comprises a second RS485 communication module (31), a second microcomputer (32), a third RS485 communication module (33), an upper computer communication port (34), an alarm output driving circuit (35) and an alarm output port (36).
2. An in-line motor insulation automatic detection device according to claim 1, characterized in that: the first detection port (11) is connected with a first microcomputer (13) through a voltage-resistant/current detection circuit (12); the second detection port (16) is connected with a first microcomputer (13) through a motor start-stop detection circuit (15); one end of the high-voltage direct-current voltage source (18) is connected with the first microcomputer (13) through the starting switch (17), and the other end of the high-voltage direct-current voltage source is connected with the first detection port (11); the first microcomputer (13) is connected with the interface module (4) through a first RS485 communication module (14).
3. An online motor insulation automatic detection device according to claim 1, characterized in that: the upper computer communication port (34) is connected with a second microcomputer (32) through a third RS485 communication module (33); the alarm output port (36) is connected with the second microcomputer (32) through an alarm output driving circuit (35); and the second microcomputer (32) is connected with the interface module (4) through a second RS485 communication module (31).
4. The method for detecting an online motor insulation automatic detection device according to claim 1, characterized in that: the method specifically comprises the following steps:
s1: the rotor winding, the stator winding and the motor shell of the detected motor are connected into a first detection port (11), and meanwhile, the working power supply of the detected motor is connected into a second detection port (16);
s2: judging whether the motor is in a running state or a shutdown state by automatically detecting a power supply voltage signal of the motor, executing the step S3 if the motor is judged to be in the shutdown state, and continuing to execute the step S2 if the motor is judged to be in the running state;
s3: starting an insulation detection program, automatically detecting an insulation value R1 of a motor rotor winding to a motor shell, and judging, outputting and storing the R1;
s4: starting an insulation detection program, automatically detecting an insulation value R2 of a motor stator winding to a motor shell, and judging, outputting and storing the R2;
s5: and the detection data is downloaded through a U disk or a connected computer, and the performance and the safety of the motor are analyzed and evaluated.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110487188.7A CN115308488A (en) | 2021-05-05 | 2021-05-05 | Online motor insulation automatic detection device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110487188.7A CN115308488A (en) | 2021-05-05 | 2021-05-05 | Online motor insulation automatic detection device and method |
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| CN115308488A true CN115308488A (en) | 2022-11-08 |
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| CN202110487188.7A Pending CN115308488A (en) | 2021-05-05 | 2021-05-05 | Online motor insulation automatic detection device and method |
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| JP2004251689A (en) * | 2003-02-19 | 2004-09-09 | Apisute:Kk | Three-phase induction motor insulation deterioration monitoring apparatus |
| JP2012194052A (en) * | 2011-03-16 | 2012-10-11 | Chugoku Electric Power Co Inc:The | Insulation reduction monitoring apparatus for field circuit, insulation reduction monitoring method and insulation reduction monitoring program |
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