CN107394752A - A kind of three-station motor overload protection device - Google Patents
A kind of three-station motor overload protection device Download PDFInfo
- Publication number
- CN107394752A CN107394752A CN201710640099.5A CN201710640099A CN107394752A CN 107394752 A CN107394752 A CN 107394752A CN 201710640099 A CN201710640099 A CN 201710640099A CN 107394752 A CN107394752 A CN 107394752A
- Authority
- CN
- China
- Prior art keywords
- motor
- loop
- overload protection
- contactor
- limit alarm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
- H02H7/0853—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 specially adapted for motors rotating in both directions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/046—Signalling the blowing of a fuse
Landscapes
- Protection Of Generators And Motors (AREA)
Abstract
The present invention relates to a kind of three-station motor overload protection device, including (1) to be connected to the direct current generator primary work loop between power positive cathode driven direct current generator to rotate；(2) it is connected between power positive cathode for controlling the rotating forward control loop of direct current generator forward and reverse and reversion control loop；(3) working power and electric current off-limit alarm device protection act output loop are provided to DC current off-limit alarm device between connection and power positive cathode.DC current off-limit alarm device directly gathers the curent change of motor main circuit, and setting electric current value is compared with alarm; protection domain has been set when signal code value increases to; then open the normally-closed contact (3,4 contact) of alarm itself; the contactor KM3 to be connected with the normally-closed contact coil losing electricity; the contactor KM3 accessed in DC MOTOR CONTROL major loop normally opened main contact is opened; DC MOTOR CONTROL major loop powers off, motor stopping, reaches the purpose of protection.
Description
Technical field
The present invention relates to a kind of motor overload protection device, and in particular to a kind of that three-station direct current generator was played
The effect of protection is carried, and is exported with alarm signal, the three-station motor overload protection device of warning function can be achieved.
Background technology
Authorization Notice No. is to disclose a kind of tri-station isolating switch operating mechanism direct current in CN202475338U patent
Motor short circuit braking circuit, such as Fig. 1, basic motor positive and inverse has been contained in the control loop of three-station motor and has been opened
Dynamic and brake servo circuit, breaker and the electric interlock of three-station operation are protected, three-station itself manually with electricity
The electic protection of dynamic switching interlocking, and the short circuit brake circuit of controlled motor.The overload protection of direct current generator is utilized in electricity
Former and later two secondary fuse 1RD, 2RD in machine control major loop, when stall overload occurs for motor, main circuit current increase,
Secondary fuse is blown first, interrupts motor operation by force, and the overload protection to motor is realized with this.This protected mode for
The starting current and overload current of motor are calculated and there are certain requirements, and the selection to fuse requires high, and is unfavorable for safeguarding, every time
The secondary fuse more renewed is needed after fusing.
Application for a patent for invention publication No. is to disclose a kind of three-station isolating grounding switch in CN103633891A to operate machine
Structure motor Quick-speed braking arrangement, such as Fig. 2, the present apparatus can not be mutated using capacitance voltage, IGCT is had ready conditions conducting and two poles
The characteristic of pipe one-way conduction, electric capacity is charged, and when capacitance voltage is close to supply voltage, electric motor loop disconnects, and is utilizing connection
To the IGCT of electric capacity, conducting braking resistor RM loops so that motor fast braking, change braking resistor access electric motor loop
Opportunity, destroy the condition that power positive cathode is connected through braking resistor, realize three-station isolating grounding switch operating mechanism
The fast braking of motor.
But this scheme, which simply makes braking resistor RM be connected in parallel to motor M both ends, carries out dynamic braking, according to the conservation of energy
Law, resistance consumption power, reduce electric current, motor speed can be reduced, but there still have electric current to pass through in loop to be not thorough
Disconnect control loop.Therefore, when motor load is still in overload, still the situation that overheat is burnt occurs in motor, and
And program alarm free function.
The content of the invention
In view of the above-mentioned problems, it is a primary object of the present invention to provide a kind of to play overload to three-station direct current generator
The effect of protection, and exported with alarm signal, the three-station motor overload protection device of warning function can be achieved.
The present invention is that solve above-mentioned technical problem by following technical proposals：A kind of three-station motor overload is protected
Protection circuit, the three-station motor overload protection circuit include：(1) driving direct current generator turns between being connected to power positive cathode
Dynamic direct current generator primary work loop；(2) it is connected between power positive cathode for controlling the rotating forward of direct current generator forward and reverse
Control loop and reversion control loop；(3) working power is provided to DC current off-limit alarm device between connection and power positive cathode
With DC current off-limit alarm device protection act output loop.
In the specific embodiment of the present invention, the DC current off-limit alarm device directly gathers the electricity of motor main circuit
Setting electric current value is compared rheologyization with alarm, and protection domain has been set when signal code value increases to, then opens report
The normally-closed contact of alert device itself, the contactor KM3 to be connected with the normally-closed contact coil losing electricity, access DC MOTOR CONTROL master return
The normally opened main contact of contactor KM3 in road is opened, the power-off of DC MOTOR CONTROL major loop, motor stopping.
In the specific embodiment of the present invention, rotate and reverse control loop and be connected to a division disconnecting switch
Controlling switch SB1, the controlling switch SB2 of a division earthed switch, rotate forward control contactor KM1, invert control contactor
KM2。
In the specific embodiment of the present invention, electric current off-limit alarm device protection act output loop is by electric current off-limit alarm
Device action output interface is directly connected to overload protection control contactor KM3.
The positive effect of the present invention is：Three-station motor overload protection device provided by the invention, to three
Position switch direct current generator plays a part of overload protection, and is exported with alarm signal, and warning function can be achieved.
Brief description of the drawings
Fig. 1 is the circuit diagram of tri-station isolating switch operating mechanism direct current generator short circuit braking in the prior art.
Fig. 2 is the circuit diagram of prompt braking device of three-station isolation grounding switch operating mechanism motor in the prior art.
Fig. 3 is the circuit diagram of three-station motor overload protection device provided by the invention.
Embodiment
Present pre-ferred embodiments are provided below in conjunction with the accompanying drawings, to describe technical scheme in detail.
Fig. 3 is the circuit diagram of three-station motor overload protection device provided by the invention.It is as shown in figure 3, of the invention
The three-station motor overload protection circuit of offer includes：(1) it is connected between power positive cathode and drives what direct current generator rotated
Direct current generator primary work loop；(2) it is connected between power positive cathode for controlling the rotating forward of direct current generator forward and reverse to control
Loop and reversion control loop；(3) working power and electricity are provided to DC current off-limit alarm device between connection and power positive cathode
Flow off-limit alarm device protection act output loop.
DC current off-limit alarm device (see 3 figure medium cloud line parts) directly gathers curent change and the alarm of motor main circuit
Setting electric current value is compared device, and protection domain has been set when signal code value increases to, then opens the normal of alarm itself
Closed contact (3,4 contact), the contactor KM3 to be connected with the normally-closed contact coil losing electricity, access DC MOTOR CONTROL major loop
In contactor KM3 normally opened main contact open, DC MOTOR CONTROL major loop power-off, motor stopping.
The controlling switch SB1 that control loop is connected to a division disconnecting switch is rotated and reverse, a division connects
The controlling switch SB2 of ground switch, rotate forward control contactor KM1, reversion control contactor KM2.
Electric current off-limit alarm device protection act output loop acts output interface (3,4 contact) directly by electric current off-limit alarm device
Overload protection control contactor KM3 is met in succession.
Direct current generator primary work loop has concatenated KM1 and KM2 normally opened contact in motor positive and negative terminal, plays normal control electricity
Machine rotating acts on；Motor positive and negative terminal concatenate KM1 and KM2 normally-closed contact, can when rotating control loop disconnects short circuit
Motor positive and negative terminal, stator winding is set to form closed-loop path, the rotor rotated according to inertia produces induced-current in the stator windings,
This induced-current produces the direction damping magnetic field opposite with rotor rotation direction in motor internal so that rotor is quickly made
It is dynamic.Set is filled with electric current off-limit alarm device body YXS, the direct induction machine loop of alarm YXS bodies on motor negative terminal line
Interior curent change.The current value that the curent change of this motor main circuit has been set with alarm YXS internal controllers is compared
It is right, protection domain has been set when signal code value increases to, then has opened alarm YXS itself normally-closed contact (3,4 contact), with
The contactor KM3 of normally-closed contact series connection coil losing electricity, the contactor KM3's accessed in DC MOTOR CONTROL major loop is normally opened
Main contact is opened, and the power-off of DC MOTOR CONTROL major loop, motor stopping, reaches protection purpose.
The scope of the present invention is adjustable, and adjustable extent is wide, can reach 10mA-15A.It is (adjustable according to different transmitter models
It is whole, duplicate below)
Cut-off loop of the present invention is swift in response, and its response time can<250ms.
Its action error precision of the invention is low, boundary value 2% set by relay output ＜；Transistor and optocoupler output ＜ institutes
If boundary value 0.5%.
The present invention has alarm signal directly perceived to export, and can be fed directly to the comprehensive guarantor of this cabinet or backstage, realize warning function.
The present invention can runback, it is non-maintaining, with application for a patent for invention publication No. be CN103633891A disclosed in circuit phase
Than resistance need not be changed, later maintenance cost has been saved.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention, the claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (4)
- A kind of 1. three-station motor overload protection circuit, it is characterised in that：The three-station motor overload protection electricity Road includes：(1) it is connected to the direct current generator primary work loop between power positive cathode driven direct current generator to rotate；(2) it is connected to electricity The positive and negative interpolar in source is used for controlling the rotating forward control loop and reversion control loop of direct current generator forward and reverse；(3) connection and electricity The positive and negative interpolar in source provides working power to DC current off-limit alarm device and DC current off-limit alarm device protection act exports back Road.
- 2. three-station motor overload protection device according to claim 1, it is characterised in that：The DC current is got over Limit alarm directly gathers the curent change of motor main circuit, and setting electric current value is compared with alarm, when signal code value Increase to and set protection domain, then open the normally-closed contact of alarm itself, the contactor KM3's to be connected with the normally-closed contact Coil losing electricity, the contactor KM3 accessed in DC MOTOR CONTROL major loop normally opened main contact are opened, and DC MOTOR CONTROL master returns Road powers off, motor stopping.
- 3. three-station motor overload protection device according to claim 1, it is characterised in that：Rotate and reverse control Loop is connected to controlling switch SB1, the controlling switch SB2 of a division earthed switch of a division disconnecting switch, just Turn control contactor KM1, reversion control contactor KM2.
- 4. three-station motor overload protection device according to claim 1, it is characterised in that：Electric current off-limit alarm device Protection act output loop is directly connected to overload protection control contactor KM3 by electric current off-limit alarm device action output interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710640099.5A CN107394752A (en) | 2017-07-31 | 2017-07-31 | A kind of three-station motor overload protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710640099.5A CN107394752A (en) | 2017-07-31 | 2017-07-31 | A kind of three-station motor overload protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107394752A true CN107394752A (en) | 2017-11-24 |
Family
ID=60341444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710640099.5A Pending CN107394752A (en) | 2017-07-31 | 2017-07-31 | A kind of three-station motor overload protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107394752A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039030A (en) * | 2020-09-18 | 2020-12-04 | 广东电网有限责任公司 | Protection circuit and protection method of three-station isolation knife |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202475338U (en) * | 2011-12-19 | 2012-10-03 | 大全集团有限公司 | Three-station isolating switch operating mechanism direct current motor short circuit braking circuit |
| CN202602578U (en) * | 2012-06-27 | 2012-12-12 | 史伟峰 | Three-phase motor short circuit brake control circuit with tap switches |
| CN204174404U (en) * | 2014-09-15 | 2015-02-25 | 温州亿生科技有限公司 | A kind of simple antioverloading Sewing machines |
| CN207381961U (en) * | 2017-07-31 | 2018-05-18 | 上海纳杰电气成套有限公司 | A kind of three-station motor overload protection device |
-
2017
- 2017-07-31 CN CN201710640099.5A patent/CN107394752A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202475338U (en) * | 2011-12-19 | 2012-10-03 | 大全集团有限公司 | Three-station isolating switch operating mechanism direct current motor short circuit braking circuit |
| CN202602578U (en) * | 2012-06-27 | 2012-12-12 | 史伟峰 | Three-phase motor short circuit brake control circuit with tap switches |
| CN204174404U (en) * | 2014-09-15 | 2015-02-25 | 温州亿生科技有限公司 | A kind of simple antioverloading Sewing machines |
| CN207381961U (en) * | 2017-07-31 | 2018-05-18 | 上海纳杰电气成套有限公司 | A kind of three-station motor overload protection device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039030A (en) * | 2020-09-18 | 2020-12-04 | 广东电网有限责任公司 | Protection circuit and protection method of three-station isolation knife |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171124 |