CN201096839Y - An AC electromotor insulation resistance detection device - Google Patents
An AC electromotor insulation resistance detection device Download PDFInfo
- Publication number
- CN201096839Y CN201096839Y CNU2007200876020U CN200720087602U CN201096839Y CN 201096839 Y CN201096839 Y CN 201096839Y CN U2007200876020 U CNU2007200876020 U CN U2007200876020U CN 200720087602 U CN200720087602 U CN 200720087602U CN 201096839 Y CN201096839 Y CN 201096839Y
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- insulation resistance
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Abstract
The utility model relates to an AC motor insulation resistance testing device, which comprises a control and processing unit, a AC-DC converter, a DC generator, a voltage sensor, a current sensor, an analog to digital converter and a display, wherein the AC input end of the AC-DC converter is connected to the AC power, and the input end of the DC generator is connected to the DC output end of the AC-DC converter. The output end of the DC generator is linked to the three-phase winding of the motor. The voltage sensor is in parallel connection on the circuit to the ground of the three-phase winding of the motor, and the current sensor is in series connection on the circuit to the ground of the three-phase winding of the motor. The utility model is an AC motor insulation resistance testing device with high precision and the integration of automatic measurement, control and display, which is applicable for the automatic detection of the insulation resistance value to the ground of the stator and rotor of the AC motors.
Description
Technical field
The utility model relates to the industrial automation field, particularly a kind of AC motor insulation resistance pick-up unit.
Background technology
The insulation against ground resistance value of the stator and rotor of alternating current generator is an important parameter of motor because it be directly connected to motor whether can operate as normal and important personal safety problem, so be very important to the measurement of this insulation values.The general metering system that adopts is to add a DC voltage that is not less than 500V between the stator and rotor of alternating current generator and the earth, and leakage current between stator and rotor by detecting alternating current generator and the earth so just can obtain this resistance value then.The most frequently used method is to adopt mechanical megger to measure this resistance value.The principle of machinery megger is that hand generator of employing sends the DC voltage about 500V, this voltage is added between the stator or rotor and the earth of alternating current generator by the measuring pen of megger, pass through the testing circuit of megger self then, drive the needle deflection of megger, thereby reach the purpose that shows this resistance value size.The shortcoming of this detection mode is that working strength of workers is big, all to carry out megger before and after each electric motor starting and detect, and the measurement result out of true, there is not warning function.So cause the workman often seldom to use mechanical megger to go to detect the insulation against ground value of alternating current generator stator and rotor, this has just stayed potential safety hazard to production.
Summary of the invention
Technical problem to be solved in the utility model is: provide a kind of precision height, collection to measure, control, are shown in the AC motor insulation detection device of one automatically.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: it comprises controlled processing unit, AC/DC changeover switch, dc generator, voltage sensor, current sensor, analog to digital converter, display screen, wherein: the alternating current input end of AC/DC changeover switch is provided with AC power and is connected, the input end of dc generator is provided with the DC output end of AC/DC changeover switch and is connected, the output terminal of dc generator is connected with motor three phase windings, voltage sensor is connected in parallel on motor three phase windings loop over the ground, current sensor is connected on motor three phase windings loop over the ground, the signal output part of voltage sensor, the signal output part of current sensor is provided with the signal input part of analog to digital converter respectively and is connected, the signal input part of single-chip microcomputer is provided with and is connected in the signal output part of analog to digital converter and the control processing system, and the signal input part of display screen is provided with the signal output part of single-chip microcomputer and is connected.
Press such scheme, also be provided with first latch between described analog to digital converter and the single-chip microcomputer.
Press such scheme, the power pins of described single-chip microcomputer, analog to digital converter, first latch all is provided with the power output end of AC/DC changeover switch and is connected.
Press such scheme, described controlled processing unit also comprises the external memory storage of keyboard input module, relay driving module, band watchdog function, the external memory storage of described keyboard input module, band watchdog function all is provided with the signal controlling end of single-chip microcomputer and is connected, and the input end of described relay driving module is provided with the signal output part of single-chip microcomputer and is connected.
Press such scheme, being connected between the signal input part of described display screen and the output terminal of single-chip microcomputer adopted serial interface mode.
Press such scheme, described keyboard input module comprises button, switching input module, and described button is provided with switching input module and is connected, and the signal input end mouth of described switching input module and single-chip microcomputer is provided with and is connected.
Press such scheme, described relay driving module comprises second latch, Darlington output array chip, relay, the output terminal of latch and single-chip microcomputer is connected, Darlington output array chip is provided with second latch and is connected, and the output terminal of Darlington output array chip is provided with relay and is connected.
The power pins of described second latch, Darlington output array chip and the output terminal of AC/DC changeover switch are provided with and are connected.
Described relay is 3-5.
Compared with prior art, advantage of the present utility model is:
1, directly provides testing power supply by the AC-DC conversion module, reduce operating personnel's workload to motor three phase windings.
2, can measure the insulation situation of motor at any time exactly.
3, it is multi-functional that this device integrates measurement, demonstration, warning, control etc., is convenient to on-the-spot installation, safeguards and management.
Description of drawings
Fig. 1 is an allomeric function block scheme of the present utility model.
Fig. 2 is a port wiring diagram of the present utility model.
Fig. 3 is power supply of the present utility model and sensor wiring diagram.
Fig. 4 is a basic circuit schematic diagram of the present utility model.
Specific embodiments
As Fig. 1, Fig. 2, Fig. 3, the utility model embodiment shown in Figure 4, it comprises controlled processing unit, AC/DC changeover switch U4, dc generator U12, voltage sensor U10, current sensor U9, analog to digital converter U3, display screen, wherein: the alternating current input end of AC/DC changeover switch U4 is provided with AC power and is connected, the input end of dc generator U12 is provided with the DC output end of AC/DC changeover switch U4 and is connected, the output terminal of dc generator U12 is connected with motor three phase windings, voltage sensor U10 is connected in parallel on motor three phase windings loop over the ground, current sensor U9 is connected on motor three phase windings loop over the ground, the signal output part of voltage sensor U10, the signal output part of current sensor U9 is provided with the signal input part of analog to digital converter U3 respectively and is connected, the signal input part of single-chip microcomputer U1 is provided with and is connected in the signal output part of analog to digital converter U3 and the control processing system, and the signal output part of single-chip microcomputer U1 is provided with and is connected in the signal input part of display screen U7 and the control processing system; Also be provided with the first latch U2 between the single-chip microcomputer U1 of described analog to digital converter U3 and control processing system; The power pins of described single-chip microcomputer U1, analog to digital converter U3, the first latch U2 is provided with the power output end of AC/DC changeover switch U4 and is connected; Described controlled processing unit also comprises the external memory storage U11 of keyboard input module, relay driving module U6, band watchdog function, the external memory storage U11 of described keyboard input module, band watchdog function is provided with the signal controlling end of single-chip microcomputer U1 and is connected, and the input end of described relay driving module U6 is provided with the signal output part of single-chip microcomputer U1 and is connected; Being connected between the output terminal of the signal input part of described display screen U7 and single-chip microcomputer U1 adopted serial interface mode; Described keyboard input module comprises button, switching input module U5, and described button is provided with switching input module U5 and is connected, and the signal input end of described switching input module U5 and single-chip microcomputer U1 is provided with and is connected; Described relay driving module comprises the second latch U13, Darlington output array chip U14, relay U8, the output terminal of the second latch U13 and single-chip microcomputer U1 is connected, Darlington output array chip U14 is provided with the second latch U13 and is connected, and the output terminal of Darlington output array chip U14 is provided with relay U8 and is connected; The power pins of the described second latch U13, Darlington output array chip U14 and the output terminal of AC/DC changeover switch U4 are provided with and are connected.Described relay U8 is 3-5.
The ultimate principle of the utility model embodiment as shown in Figure 1: at first the 220V AC signal enters into the AC/DC changeover switch of system, and AC/DC changeover switch converts 220VAC to system required various DC voltage, comprises 24VDC, 15VDC, 5VDC.Wherein 15VDC and 5VDC are to the Single Chip Microcomputer (SCM) system power supply, and 24VDC then powers to 500V dc generator U12.24VDC just has been converted into 500VDC behind the 500V dc generator, this is the power generation process that has replaced mechanical megger.500VDC directly is added to three phase windings of alternating current generator by lead-out terminal, between three phase windings of alternating current generator and the earth, just formed a loop like this, voltage sensor is attempted by on this loop, it is transferred to analog to digital converter after the voltage signal on the loop being converted to the 0-5VDC signal of standard again, equally, current sensor then is to be serially connected on this loop, and it is transferred to analog to digital converter again with the standard signal that the leakage current on this loop also converts 0-5VDC to.The Single-chip Controlling analog to digital converter carries out voltage signal and the current signal collection on the loop, and handles through software, thereby calculates current insulation against ground resistance value.Button is given the single-chip microcomputer input signal by the switching value input circuit, and can finish a series of parameter setting flow process.Single-chip microcomputer judges whether to export various control signals and alerting signal after computed in software, it is by the pilot relay driver module, reaches the purpose of pilot relay action.Simultaneously, single-chip microcomputer is also controlled the current state of LCDs demonstration and the insulation against ground value of motor three-phase.The external memory storage of band watchdog function is used to monitor the duty of single-chip microcomputer, can provide reset signal in case of necessity, and single-chip microcomputer is to exist in the external memory storage of band watchdog function with the parameter of default, like this after the power down, systematic parameter is with regard in the external memory storage that is stored in the band watchdog function and can not lose.
As shown in Figure 2, external cabling terminal of the present utility model is described below: terminal the 207, the 208th, the input end of 220VAC power supply, terminal the 214, the 215th, the input end of insulation detection signal, when the switching value signal of a closure of external given, device just begins the testing of insulating, otherwise does not work.216,218 terminals are 500VDC lead-out terminals, only when device insulate testing, just can be added with 500VDC on this terminal.Terminal 218 is directly received on the three-phase of alternating current generator, terminal 216 ground connection; Terminal 209, terminal 210 are normal battles of relay control output, are used for external control circuit, and it is the only actuating of relay when device insulate testing also, and the normally opened contact of relay is just closed; 201,202,203 and 204,205,206 of terminals are two pairs of alarm relay output points, respectively comprise a normally opened contact and a normally closed contact, are used for the warning function of external control circuit.When device insulated testing, when detecting motor stator and rotor insulation values over the ground and be lower than the alarming value of setting, alarm relay just began to move simultaneously, and promptly original normal battle is closed, and normally closed point originally disconnects.
As shown in Figure 3, Figure 4, U1 is a single-chip microcomputer, and the 32-39 pin of U1 is its P0 mouth, and the P0 mouth is the bidirectional interface of an address and data multiplex.The P0 mouth of U1 has been connected on the D0-D8 data port of U2, the model of U2 is SN74HC373N, it is a latch, 30 pin of U1 have been connected to 11 pin of U2, this pin signal is ALE, i.e. address latch signal, and U1 will be latched into earlier from the address signal that the P0 mouth is brought on the Q1 mouth of U2 by this ale signal, this HBEN signal is 2 pin of U2, and it is connected to 5 pin of U3.U3 is the analog to digital converter of one 12 bit resolution, and the HBEN signal is used to select least-significant byte data and high 4 bit data of U3.Simultaneously, the P0 mouth of U1 also is connected on the 7-14 pin of U3, uses as data line.The 14 pin ADCS of U1 are connected to 2 pin of U3, and this is the chip selection signal of U3, have only when it when low, U3 is just chosen by U1, could operate as normal.16,17 pin of U1 are connected respectively to 3,4 pin of U3, and these are read-write control lines of U3, are used to control U3 and carry out read operation or write operation.The 24 pin INT0 of U3 are connected to 12 pin of U1, are used for signal feedback, and the current analog to digital conversion of notice U1 has been finished.U9, U10 are respectively current sensor 5 and voltage sensor 4, and U10 is the voltage sensor 4 of 500V/5V, and the standard 0-5V type signal after it will be changed is delivered to 17 pin of U3, and U1 just can control U3 by the voltage signal on the channel C H1 acquisition circuit.Equally, U9 is the current sensor 5 of 1mA/5V, and the standard 0-5V signal after it will be changed is delivered to 16 pin of U3, and U1 just can pass through the leakage current on the channel C HO acquisition circuit by control U3.
U4 and U12 are power module 1, wherein U4 is the power module of 220VAC/5VDC/12VDC, it converts the 220V AC power to the 5V direct supply and uses for Single Chip Microcomputer (SCM) system, converts the 220V AC power to the 12V direct supply and uses for switching value output and relay.U12 is the power module of 220VAC/24VDC, and it converts the 220V AC power to the 24V direct supply and uses for the 500V dc generator.So the power supply output pin 3,5 of U4 has been connected respectively to the power input 1,2 of U12.U12 is the 500V dc generator, and the high voltage supply testing circuit that it will export a 500V uses, and its output has been connected to the terminal 216 and 218 among Fig. 2.
U11 is the external memory storage of band watchdog function, and 1 pin of U11 has been connected to 15 pin of U1, as the chip selection signal of U11.2,5,6 pin of U11 have been connected respectively to 21,22,7 pin of U1, and the line of these three pin has constituted the three-wire system SPI communication of a standard, and U1 can carry out reading and writing of external memory storage by the communications protocol of these three pin.7 pin of U11 have been connected to 9 pin of U1, and this pin is reset signal RST, and when system powered on, U11 gave U1 by reset signal of this RST pin output, and U1 just begins operate as normal.U11 has played the effect of house dog simultaneously, U11 is in case work, just begin self-clocking, if in this section timing time, U1 not 1 pin by U11 gives one and plays the dog signal, and U11 just can be by 7 pin to RST signal of U1 output so, makes the single-chip microcomputer U1 work of restarting that resets, the purpose of doing like this is the program fleet that prevents among the U1, improves the reliability of system.
JP1 is a button, and it is connected to the 25-28 pin of single-chip microcomputer U1 by switching input module U5, constitutes a switching value input, and U1 makes various program redirects according to input state, as revising the alarming value parameter.U13 and U14 have then constituted relay driving module, and U13 is a latch, and the 2-9 pin of U13 has been connected to the P0 mouth of U1, and the data of the P0 mouth of U13 by latching U1 are exported switching value like this; U14 is a Darlington output array chip, mainly is the effect of playing by-pass cock amount output current, and its output has been directly connected to relay J 1-J5.
What LCDs adopted is serial interface mode, 1 pin of U1 is received the LCDCS chip select pin of LCDs, 2 pin of single-chip microcomputer U1 are received the SCLK serial clock pin of LCDs, 3 pin of U1 are received the DI serial data pin of LCDs, during demonstration, U1 at first controls the LCDCS pin and chooses LCDs, then serial clock SCLK synchronously down will data presented by DI pin immigration LCDs.
Claims (9)
1, a kind of AC motor insulation resistance pick-up unit, it is characterized in that: it comprises controlled processing unit, AC/DC changeover switch, dc generator, voltage sensor, current sensor, analog to digital converter, display screen, wherein: the alternating current input end of AC/DC changeover switch is provided with AC power and is connected, the input end of dc generator is provided with the DC output end of AC/DC changeover switch and is connected, the output terminal of dc generator is connected with motor three phase windings, voltage sensor is connected in parallel on motor three phase windings loop over the ground, current sensor is connected on motor three phase windings loop over the ground, the signal output part of voltage sensor, the signal output part of current sensor is provided with the signal input part of analog to digital converter respectively and is connected, the signal input part of single-chip microcomputer is provided with and is connected in the signal output part of analog to digital converter and the control processing system, and the signal input part of display screen is provided with the signal output part of single-chip microcomputer and is connected.
2, AC motor insulation resistance pick-up unit as claimed in claim 1 is characterized in that: also be provided with first latch between described analog to digital converter and the single-chip microcomputer.
3, AC motor insulation resistance pick-up unit as claimed in claim 2 is characterized in that: the power pins of described single-chip microcomputer, analog to digital converter, first latch is provided with the power output end of AC/DC changeover switch and is connected.
4, as claim 1 or 2 or 3 described AC motor insulation resistance pick-up units, it is characterized in that: described controlled processing unit also comprises the external memory storage of keyboard input module, relay driving module, band watchdog function, the external memory storage of described keyboard input module, band watchdog function is provided with the signal controlling end of single-chip microcomputer and is connected, and the input end of described relay driving module is provided with the signal output part of single-chip microcomputer and is connected.
5, as claim 1 or 2 or 3 described AC motor insulation resistance pick-up units, it is characterized in that: being connected between the signal input part of described display screen and the output terminal of single-chip microcomputer adopted serial interface mode.
6, AC motor insulation resistance pick-up unit as claimed in claim 4, it is characterized in that: described keyboard input module comprises button, switching input module, described button is provided with switching input module and is connected, and the signal input end of described switching input module and single-chip microcomputer is provided with and is connected.
7, AC motor insulation resistance pick-up unit as claimed in claim 4, it is characterized in that: described relay driving module comprises second latch, Darlington output array chip, relay, the output terminal of second latch and single-chip microcomputer is connected, Darlington output array chip is provided with second latch and is connected, and the output terminal of Darlington output array chip is provided with relay and is connected.
8, AC motor insulation resistance pick-up unit as claimed in claim 7 is characterized in that: the power pins of described second latch, Darlington output array chip and the output terminal of AC/DC changeover switch are provided with and are connected.
9, AC motor insulation resistance pick-up unit as claimed in claim 7 is characterized in that: described relay is 3-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200876020U CN201096839Y (en) | 2007-10-18 | 2007-10-18 | An AC electromotor insulation resistance detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200876020U CN201096839Y (en) | 2007-10-18 | 2007-10-18 | An AC electromotor insulation resistance detection device |
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| CN201096839Y true CN201096839Y (en) | 2008-08-06 |
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| CNU2007200876020U Expired - Fee Related CN201096839Y (en) | 2007-10-18 | 2007-10-18 | An AC electromotor insulation resistance detection device |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101950950A (en) * | 2010-09-20 | 2011-01-19 | 石家庄爱科特科技开发有限公司 | Self-checking protective device of motor before starting |
| CN102545487A (en) * | 2011-11-18 | 2012-07-04 | 南京钢铁股份有限公司 | Method for rapidly improving rotor insulation value of main transmission alternating current variable frequency synchronous motor |
| CN101509958B (en) * | 2008-11-26 | 2012-07-04 | 北京理工大学 | Signal conversion collecting device for test platform of motor drive system of electric automobile |
| CN102680791A (en) * | 2012-05-24 | 2012-09-19 | 重庆市防雷中心 | Automatic test system for resistance reducing agent resistivity and power frequency current tolerance test |
| CN102759664A (en) * | 2012-03-09 | 2012-10-31 | 田京涛 | Detection device for insulation resistance of electrical equipment |
| CN103105564A (en) * | 2011-11-14 | 2013-05-15 | 沈阳铝镁设计研究院有限公司 | Aluminum electrolytic cell series ground insulation intensity measuring circuit |
| CN103134991A (en) * | 2011-11-29 | 2013-06-05 | 上海西门子医疗器械有限公司 | Equipment with resistance measurement device and method for measuring carbon brush contact resistance |
| CN103217582A (en) * | 2013-04-10 | 2013-07-24 | 湖南主导科技发展有限公司 | System for detecting internal resistance of three-phase motor of electric water pump |
| CN105004929A (en) * | 2015-07-31 | 2015-10-28 | 苏州路之遥科技股份有限公司 | Measuring method capable of automatically measuring internal resistance of motor winding |
| CN107561365A (en) * | 2017-08-15 | 2018-01-09 | 成都普诺科技有限公司 | Detect the monitor station of insulaion resistance |
| CN108196124A (en) * | 2017-12-29 | 2018-06-22 | 河南北瑞电子科技有限公司 | A kind of machine winding insulation resistance on-line detecting system |
| CN110108939A (en) * | 2018-02-01 | 2019-08-09 | 宁德时代新能源科技股份有限公司 | Alternating current motor insulation impedance obtaining method and device based on alternating current injection method |
| CN110554237A (en) * | 2018-05-30 | 2019-12-10 | 王建明 | Intelligent test system for insulation resistance of high-voltage motor |
| CN111308205A (en) * | 2019-12-03 | 2020-06-19 | 湖北江山重工有限责任公司 | General insulation resistance detection device |
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2007
- 2007-10-18 CN CNU2007200876020U patent/CN201096839Y/en not_active Expired - Fee Related
Cited By (19)
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| CN101509958B (en) * | 2008-11-26 | 2012-07-04 | 北京理工大学 | Signal conversion collecting device for test platform of motor drive system of electric automobile |
| CN101950950B (en) * | 2010-09-20 | 2013-06-26 | 石家庄爱科特科技开发有限公司 | Self-checking protective device of motor before starting |
| CN101950950A (en) * | 2010-09-20 | 2011-01-19 | 石家庄爱科特科技开发有限公司 | Self-checking protective device of motor before starting |
| CN103105564A (en) * | 2011-11-14 | 2013-05-15 | 沈阳铝镁设计研究院有限公司 | Aluminum electrolytic cell series ground insulation intensity measuring circuit |
| CN102545487A (en) * | 2011-11-18 | 2012-07-04 | 南京钢铁股份有限公司 | Method for rapidly improving rotor insulation value of main transmission alternating current variable frequency synchronous motor |
| CN102545487B (en) * | 2011-11-18 | 2013-07-24 | 南京钢铁股份有限公司 | Method for rapidly improving rotor insulation value of main transmission alternating current variable frequency synchronous motor |
| CN103134991A (en) * | 2011-11-29 | 2013-06-05 | 上海西门子医疗器械有限公司 | Equipment with resistance measurement device and method for measuring carbon brush contact resistance |
| CN102759664A (en) * | 2012-03-09 | 2012-10-31 | 田京涛 | Detection device for insulation resistance of electrical equipment |
| CN102680791A (en) * | 2012-05-24 | 2012-09-19 | 重庆市防雷中心 | Automatic test system for resistance reducing agent resistivity and power frequency current tolerance test |
| CN102680791B (en) * | 2012-05-24 | 2015-05-13 | 重庆市防雷中心 | Automatic test system for resistance reducing agent resistivity and power frequency current tolerance test |
| CN103217582A (en) * | 2013-04-10 | 2013-07-24 | 湖南主导科技发展有限公司 | System for detecting internal resistance of three-phase motor of electric water pump |
| CN103217582B (en) * | 2013-04-10 | 2015-03-25 | 湖南主导科技发展有限公司 | System for detecting internal resistance of three-phase motor of electric water pump |
| CN105004929A (en) * | 2015-07-31 | 2015-10-28 | 苏州路之遥科技股份有限公司 | Measuring method capable of automatically measuring internal resistance of motor winding |
| CN107561365A (en) * | 2017-08-15 | 2018-01-09 | 成都普诺科技有限公司 | Detect the monitor station of insulaion resistance |
| CN108196124A (en) * | 2017-12-29 | 2018-06-22 | 河南北瑞电子科技有限公司 | A kind of machine winding insulation resistance on-line detecting system |
| CN110108939A (en) * | 2018-02-01 | 2019-08-09 | 宁德时代新能源科技股份有限公司 | Alternating current motor insulation impedance obtaining method and device based on alternating current injection method |
| CN110108939B (en) * | 2018-02-01 | 2021-02-19 | 宁德时代新能源科技股份有限公司 | Alternating current motor insulation impedance obtaining method and device based on alternating current injection method |
| CN110554237A (en) * | 2018-05-30 | 2019-12-10 | 王建明 | Intelligent test system for insulation resistance of high-voltage motor |
| CN111308205A (en) * | 2019-12-03 | 2020-06-19 | 湖北江山重工有限责任公司 | General insulation resistance detection device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080806 Termination date: 20101018 |