CN105186457A - Low-voltage motor protection device - Google Patents
Low-voltage motor protection device Download PDFInfo
- Publication number
- CN105186457A CN105186457A CN201510665525.1A CN201510665525A CN105186457A CN 105186457 A CN105186457 A CN 105186457A CN 201510665525 A CN201510665525 A CN 201510665525A CN 105186457 A CN105186457 A CN 105186457A
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- motor
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- protecter
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Abstract
The invention relates to the technical field of motor protections, and especially relates to a low-voltage motor protection device. The device comprises a low-voltage motor, a current transformer, and a motor protector. The low-voltage motor is connected with the power supply through a contactor KM1, and the current transformer is disposed at the input end of the low-voltage motor and is used for monitoring an input current. The motor protector receives a current signal collected by the current transformer, and controls the on/off of the contactor KM1. Through the arrangement of the current transformer, the device can collect the current of the low-voltage motor timely, and the motor protector controls the operation of the contactor KM1 according to a current value collected by the current transformer, thereby achieving protection. The programmable arrangement of the motor protector facilitates the modification of a setting current and other parameters on site, so the method is wide in application range.
Description
Technical field
The present invention relates to Protection Technology for Motors field, particularly a kind of motor Protective Device.
Background technology
Motor is the main force of life medium power equipment substantially, application popularization is extensive, it has related to all trades and professions substantially, its status cannot be weighed with numeral and language, but, be exactly so important equipment, in actual use, due to electrical network, some row factors of motor itself or circuit etc. can cause motor to occur overvoltage, under-voltage, the fault such as current imbalance and overcurrent, these faults the lighter affects normally carrying out of production, severe one motor damage, whole equipment is caused to paralyse even system crash, and then cause economic loss difficult to the appraisal.In addition, the electricity that motor consumes in the process of burning is also very large, and therefore, consider economic loss and economize on resources, the protection work carrying out motor has very large meaning, must become the problem of enough attention.
Summary of the invention
The object of the present invention is to provide one reliably, programmable motor Protective Device.
For realizing above object; the technical solution used in the present invention is: a kind of motor Protective Device; comprise low-tension motor, current transformer and motor protecter; described low-tension motor is connected with power supply by contactor KM1; current transformer is arranged on the input of low-tension motor for monitoring input current, and the current signal that motor protecter received current instrument transformer collects control contactor KM1 are closed or disconnect.
Compared with prior art; there is following technique effect in the present invention: by arranging current transformer; the electric current of low-tension motor can be gathered in time; the current value control contactor KM1 action that motor protecter collects according to current transformer realizes protection; the setting able to programme of motor protecter; can change the parameters such as setting current easily in scene, applicable situation is more.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is circuit diagram of the present invention.
Embodiment
Below in conjunction with Fig. 1 to Fig. 2, the present invention is described in further detail.
Consult Fig. 1, the change that the development of computer technology makes electric motor protecting there occurs to advance by leaps and bounds, occur intelligent protection device; it is fast that Intelligent protection equipment has speed; intelligence degree advantages of higher, it, using single-chip microcomputer or DSP as controller, realizes intelligent protection.Intelligent protection equipment can be protected motor phase failure, overload, short circuit, under-voltage, stall etc., also has display current/voltage, to the function of the memory of fault; Meanwhile, also can carry out software gamma correction to sampled signal, the calculating and the sampling with high precision that realize authentic and valid value extract.This type of protector is energy-conservation, sensitive, and accurate defencive function is complete, reproducible.In the present invention; have employed intelligentized motor protecter 30 to avoid described in background technology and deficiency; its concrete scheme is: a kind of motor Protective Device; comprise low-tension motor 10, current transformer 20 and motor protecter 30; described low-tension motor 10 is connected with power supply 40 by contactor KM1; current transformer 20 is arranged on the input of low-tension motor 10 for Gather and input electric current, and the current signal that motor protecter 30 received current instrument transformer 20 collects control contactor KM1 are closed or disconnect.Gathered by the input electric current of current transformer 20 pairs of low-tension motors 10; motor protecter 30 carrys out control contactor KM1 action according to the current value collected; realize the protection of low-tension motor 10, this protection can be used for the basic protection of 0.66KV and following electric pressure various current specification motor.
Consult Fig. 2, particularly, described power supply 40 is three-phase electricity, and the port one of motor protecter 30 is connected with the A phase line of power supply 40 after fuse FU, and the port 2 of motor protecter 30 is connected with the zero line N of power supply 40; Port 21 in motor protecter 30 is connected with the A phase line of power supply after fuse FU, and the port 22 of motor protecter 30 is connected with coil one end of contactor KM1, and the other end of this coil is connected with the zero line N of power supply 40; The coil two ends of contactor KM1 are also parallel with resistance and electric capacity.Here the port 21 of motor protecter 30, the normally-closed contact of 22 also i.e. motor protecter 30 repeat circuit J1, common, again under normality, due to the port 21 of motor protecter 30, 22 is be communicated with, so the coil of contactor KM1 obtains electric, contactor KM1 closes, low-tension motor 10 is connected with power supply 40, normal work, once the electric current that current transformer 20 collects occurs abnormal, relay J 1 action, the port 21 of motor protecter 30, 22 disconnect, the coil losing electricity of contactor KM1, contactor KM1 disconnects, low-tension motor 10 is separated with power supply 40, effectively protect low-tension motor 10.
Preferably, start button, stop button is disposed with between the port 22 of described motor protecter 30 and one end of contactor KM1 coil; Start button is push-button switch open in usual, and stop button is normally closed type push-button switch; Start button side is parallel with K switch M1, and when the coil of contactor KM1 obtains electric, K switch M1 closes, and during the coil losing electricity of contactor KM1, K switch M1 disconnects.After arranging start button, when making whole system obtain electric, contactor KM1 still remains open, and low-tension motor 10 still quits work, and only presses start button, and whole system just normally works.Stop button is set, can when being in an emergency, artificial power-off, improves the fail safe of whole device further.Owing to being provided with K switch M1, so start button and stop button can adopt push-button switch, certainly, do not arrange K switch M1 also passable, just this time, start button and stop button will be arranged to knob switch after control switch.
In use, first operating personnel press start button, and this time, the coil of contactor KM1 obtained electric, and contactor KM1 closes, and low voltage motor 10 switches on power and 40 normally to work; Meanwhile, K switch M1 closes.Subsequently, even if the open start button of operating personnel, because K switch M1 is closed, this device continues normal work.When break down and motor protecter 30 is reactionless need emergency shutdown time; operating personnel press stop button; the coil losing electricity of contactor KM1; contactor KM1 disconnects and K switch M1 disconnects; now; even if operating personnel unclamp stop button, because K switch M1 and start button are all disconnect, whole device is still out-of-work.
Preferably, the port 31,32 of described motor protecter 30 is connected with current transformer 20 port 32 ground connection of the current information collected for received current instrument transformer 20, motor protecter 30.
Further, A, B, C phase line of described power supply 40 is drawn respectively a branch road successively through primary cut-out QF, contactor KM1, control thyristor MCT after be connected with low-tension motor 10; The port one 1,12,13 of motor protecter 30 is connected with three inputs of low-tension motor 10 respectively.Primary cut-out QF is set and controls thyristor MCT mainly for the protection of circuit.
Further, be connected with reset button between the port 70,73 of described motor protecter 30, reset button is used for resetting when motor protecter 30 breaks down using.The port 24,25 of motor protecter 30 is for exporting leakage pre-alarm signal, and the port 26,27 of motor protecter 30 is for exporting conventional fault alarm signal.User can connect the 24-27 port of motor protecter 30 as required.
Further, the port one 5,16 of described motor protecter 30 is for exporting 4-20mA analog quantity.The port 58,59 of motor protecter 30 is connected with background computer as communication interface, so just can easily send data to background computer, be convenient to follow-up process, analysis, storage.
Claims (7)
1. a motor Protective Device; it is characterized in that: comprise low-tension motor (10), current transformer (20) and motor protecter (30); described low-tension motor (10) is connected with power supply (40) by contactor KM1; the input that current transformer (20) is arranged on low-tension motor (10) is used for Gather and input electric current, and the current signal that motor protecter (30) received current instrument transformer (20) collects control contactor KM1 are closed or disconnect.
2. motor Protective Device as claimed in claim 1, it is characterized in that: described power supply (40) is three-phase electricity, the port one of motor protecter (30) is connected with the A phase line of power supply (40) after fuse FU, and the port 2 of motor protecter (30) is connected with the zero line N of power supply (40); Port 21 in motor protecter (30) is connected with the A phase line of power supply after fuse FU, and the port 22 of motor protecter (30) is connected with coil one end of contactor KM1, and the other end of this coil is connected with the zero line N of power supply (40); The coil two ends of contactor KM1 are also parallel with resistance and electric capacity.
3. motor Protective Device as claimed in claim 2, is characterized in that: be disposed with start button, stop button between the port 22 of described motor protecter (30) and one end of contactor KM1 coil; Start button is push-button switch open in usual, and stop button is normally closed type push-button switch; Start button side is parallel with K switch M1, and when the coil of contactor KM1 obtains electric, K switch M1 closes, and during the coil losing electricity of contactor KM1, K switch M1 disconnects.
4. motor Protective Device as claimed in claim 2; it is characterized in that: the port 31,32 of described motor protecter (30) is connected with current transformer (20) port 32 ground connection of the current information collected for received current instrument transformer (20), motor protecter (30).
5. motor Protective Device as claimed in claim 2, is characterized in that: A, B, C phase line of described power supply (40) is drawn respectively a branch road and be connected with low-tension motor (10) after primary cut-out QF, contactor KM1, control thyristor MCT successively; The port one 1,12,13 of motor protecter (30) is connected with three inputs of low-tension motor (10) respectively.
6. motor Protective Device as claimed in claim 2; it is characterized in that: between the port 70,73 of described motor protecter (30), be connected with reset button; the port 24,25 of motor protecter (30) is for exporting leakage pre-alarm signal, and the port 26,27 of motor protecter (30) is for exporting conventional fault alarm signal.
7. motor Protective Device as claimed in claim 1, is characterized in that: the port one 5,16 of described motor protecter (30) is for exporting 4-20mA analog quantity; The port 58,59 of motor protecter (30) is connected with background computer as communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510665525.1A CN105186457B (en) | 2015-10-16 | 2015-10-16 | Motor Protective Device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510665525.1A CN105186457B (en) | 2015-10-16 | 2015-10-16 | Motor Protective Device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105186457A true CN105186457A (en) | 2015-12-23 |
| CN105186457B CN105186457B (en) | 2018-03-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510665525.1A Active CN105186457B (en) | 2015-10-16 | 2015-10-16 | Motor Protective Device |
Country Status (1)
| Country | Link |
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| CN (1) | CN105186457B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106740993A (en) * | 2016-12-14 | 2017-05-31 | 太原科技大学 | A kind of railway signaling dynamic driving device and its guard method with defencive function |
| CN108695826A (en) * | 2018-06-26 | 2018-10-23 | 河南森源电气股份有限公司 | A kind of protective device and activation system of low-tension motor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101202437A (en) * | 2007-12-21 | 2008-06-18 | 王卫东 | Plastic shell type electromechanical integration three phase ac electric motor protector |
| US20090001921A1 (en) * | 2006-01-20 | 2009-01-01 | Carrier Corporation | Electronic Method for Starting a Compressor |
| CN101593965A (en) * | 2008-05-26 | 2009-12-02 | 鞍钢集团矿业公司 | The intelligent low-pressure motor protecter of charged energy function of measuring |
| CN103997020A (en) * | 2014-06-12 | 2014-08-20 | 株洲南车时代电气股份有限公司 | Protector for three-phase motor of alternating-current or direct-current electric locomotive |
| CN205039323U (en) * | 2015-08-17 | 2016-02-17 | 六盘水师范学院 | Plug with adsorb leather cup |
-
2015
- 2015-10-16 CN CN201510665525.1A patent/CN105186457B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090001921A1 (en) * | 2006-01-20 | 2009-01-01 | Carrier Corporation | Electronic Method for Starting a Compressor |
| CN101202437A (en) * | 2007-12-21 | 2008-06-18 | 王卫东 | Plastic shell type electromechanical integration three phase ac electric motor protector |
| CN101593965A (en) * | 2008-05-26 | 2009-12-02 | 鞍钢集团矿业公司 | The intelligent low-pressure motor protecter of charged energy function of measuring |
| CN103997020A (en) * | 2014-06-12 | 2014-08-20 | 株洲南车时代电气股份有限公司 | Protector for three-phase motor of alternating-current or direct-current electric locomotive |
| CN205039323U (en) * | 2015-08-17 | 2016-02-17 | 六盘水师范学院 | Plug with adsorb leather cup |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106740993A (en) * | 2016-12-14 | 2017-05-31 | 太原科技大学 | A kind of railway signaling dynamic driving device and its guard method with defencive function |
| CN108695826A (en) * | 2018-06-26 | 2018-10-23 | 河南森源电气股份有限公司 | A kind of protective device and activation system of low-tension motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105186457B (en) | 2018-03-30 |
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