CN101197229A

CN101197229A - Protection breaker of electric motor

Info

Publication number: CN101197229A
Application number: CNA2007101563418A
Authority: CN
Inventors: 蔡甫寒; 周挺巧; 介国安
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-10-20
Filing date: 2007-10-20
Publication date: 2008-06-11
Anticipated expiration: 2027-10-20
Also published as: CN101197229B

Abstract

The invention relates to automatic control technical field, in particular to an electric motor protection breaker, which is characterized in which the breaker and a protector are connected and combined into a novel electric motor protection breaker on the base of the prior breaker structure. The protector is provided with a phase power inlet wire terminator, a zero line inlet wire terminator, and a zero line outlet wire terminator, and further provided with a panel. The panel is provided with a current commutation regulation resistance revolving button, a reset button and a function shifting switch, a button escaper transmission dialing pole on the protector is inserted into a breaker button escaping hole. The protector is divided into a three-phase protector and a single-phase protector, thus forming the electric motor three-phase protection breaker and the single-phase protection breaker. The protector has similar shape with the breaker, wherein the guide rail fixing sizes are same. The invention has high accuracy and high stability, thereby being applicable to protection of various electric motors and other devices.

Description

Motor protection circuit breaker

Technical field

The present invention relates to automation field, particularly motor protection circuit breaker.

Background technology

At present; circuit breaker is the comparatively ideal relay switch of short circuit protection; but overcurrent protection is to adopt mechanical type overload relay structure; because the thermal relay of sheet metal is subjected to the restriction of material and processing conditions; to the overcurrent protection poor reliability; the creepage protection function that cooperates circuit breaker to use is single, can not satisfy the requirement of multifunctional comprehensive protection.Existing electron type motor protector is comparatively desirable for overload, stall, phase shortage and three-phase imbalance, and then speed is slow to the short circuit protective reaction, does not have due short-circuit protection effect.

Summary of the invention

The objective of the invention is provides a kind of motor protection circuit breaker at above-mentioned defective.Motor protector and circuit breaker are integrally combined, obviously complementary above-mentioned deficiency, and can in main circuit, save parts such as contactor.

Technical scheme of the present invention is a motor protection circuit breaker, comprise circuit breaker (2), mutually electric input terminal (15), mutually electric outlet terminal (16) zero line outlet terminal (18) and killer switch handle (41) are installed on this circuit breaker (2), it is characterized in that said circuit breaker (2) and protector (1) are combined connecting structures; Protector (1) is provided with mutually electric input terminal (14), zero line input terminal (17) and zero line outlet terminal (18); protector (1) is provided with panel (19), and current calibration potentiometer spinner (20), reset button (22) and function diverter switch (23) are installed on the panel (19).

Said circuit breaker (2) is the profile of protector (1) and the appearance similar of circuit breaker (2) with protector (1) combined connecting structure; adopt screw (8) (9) to be fastenedly connected; the lower casing (26) of protector (1) is provided with guide rail draw-in groove (6) and is connected with circuit breaker (2) buckle in addition; output line (3) on the protector (1) is electrically connected with the mutually electric input terminal of circuit breaker (15); guard shield (4) is arranged outside the protector output line (3); guard shield clip (5) on clip on it (5) and the upper and lower enclosure (25) (26) buckle mutually connects, and trip gear (11) also is installed on protector (1) and the dial (21) that matches with current calibration potentiometer knob (20) is arranged.

Main circuit board (29) and auxiliary circuit board 1 (30) and auxiliary circuit board 2 (31) are installed on the said protector (1), auxiliary circuit board 2 (31) is installed on the main circuit board (29), and indicator light, reset button and function diverter switch are installed on the auxiliary circuit board 2 (31); The control power circuit is installed in auxiliary line plate 1 (30) and goes up and be fixed on the side of lower casing (26); Current transformer, zero-sequence transformer are installed in protector, be installed in the instrument transformer holddown groove of lower casing (26), the output line of the secondary output line of current transformer, zero-sequence transformer and control power supply is connected respectively on the hook-up wiring receptacle, one connecting line plug is arranged on the main circuit board (29), when upper casing (25) and lower casing (26) when being buckled together, the connecting line plug just in time inserts in the hook-up wiring receptacle; Protector (1) three-phase input terminal has three leads to penetrate three current transformers respectively; the zero line input terminal have lead that a lead passes with three current transformers totally four leads penetrate zero-sequence mutual inductance feelings device; lead with protector three-phase input terminal line leads to the protector outlet then; connect circuit breaker three-phase input terminal again, the lead that is connected with the zero line input terminal connects the zero line outlet terminal again.

Current signal sampling circuit, the signal amplifying circuit of adjusting is installed on the said main circuit board (29), divide with current foldback circuit be connected at four the tunnel: the one tunnel then, one the tunnel is connected with uneven, open-phase protection circuit, another road is connected with the earth leakage protective selector switch, and one the tunnel is connected with the running status indicating circuit again; The heat accumulation attenuator circuit is connected with current foldback circuit; the protection lock definiteness shows that circuit is connected with uneven open-phase protection circuit with current foldback circuit simultaneously; also be connected with driving output release circuit; power supply input circuit is electrically connected with rectification, filter regulator circuit, and rectification filtering voltage stabilizing circuit is connected with foregoing circuit respectively.

Advantage of the present invention is because protector and circuit breaker are combined as a whole, and is fast to short circuit protective reaction speed to the overcurrent protection good reliability, even more ideal for overload, stall, phase shortage and three-phase imbalance protection simultaneously.

Description of drawings

Fig. 1 is a three-dimensional structure diagram of the present invention.

Fig. 2 is the single-phase circuit breaker three-dimensional structure diagram.

Fig. 3 is protector and circuit breaker combined state stereogram.

Fig. 4 is the protector structure decomposing schematic representation.

Fig. 5 is a circuit structure block diagram of the present invention.

Fig. 6 is a motor three-phase protective breaker circuit schematic diagram.

Embodiment

Further specify embodiment below in conjunction with accompanying drawing.

With reference to Fig. 1; Fig. 2; Fig. 3; Fig. 4, the 1-protector; the 2-circuit breaker; 3-protector output line; 4-connecting line guard shield; 5-guard shield clip; 6-protector guide rail draw-in groove; 7-circuit breaker guide rail draw-in groove; 8-attachment screw hole; the 9-attachment screw; 10-release drive link; the 11-release; 12-release cover plate; 13-release cover plate positioning head; 14-protector three-phase input terminal; 15-circuit breaker three-phase input terminal; 16-circuit breaker three-phase goes out to tie terminal; 17-zero line input terminal; 18-zero line outlet terminal; the 19-panel; 20-current calibration potentiometer knob; 21-current calibration potentiometer scale; the 22-reset button; 23-function diverter switch; the 24-indicator light; the 25-upper casing; the 26-lower casing; 27-upper casing and lower casing junction button; 28-dropout hole; the 29-main circuit board; the 30-auxiliary circuit board; the 31-auxiliary circuit board; the 32-current transformer; the 33-zero-sequence transformer; 34-current calibration potentiometer; the 35-hook-up wiring receptacle; 36-connecting line plug; the 37-internal connection line; 38-main circuit board fixed mount; 39-main circuit board hold-down screw; 40-guide rail draw-in groove button; 41-killer switch handle; the 42-location notch; 43-release cover plate location hole; 44-instrument transformer holddown groove; the single-phase input terminal of 45-protector; the single-phase outlet terminal of 46-circuit breaker.As shown, the left side is a protector 1, and the right side is a circuit breaker 2, and circuit breaker 2 is basic identical with traditional breaker structure.The point of innovation of the present invention is that circuit breaker 2 is become as a whole with protector 1 combining structure, and protector 1 is that product and circuit breaker 2 newly developed is combined into motor protection circuit breaker.Can overcome the former deficiency that pre-exists of conventional circuit breaker, earth leakage protective device and motor protector, have good performance, become a new product kind of field of electromotor protectors.The structure of circuit breaker 2 is that mutually electric input terminal 15 is installed on it; mutually electric outlet terminal 16; zero line outlet terminal 17 and switch knob 41; circuit breaker 2 and protector 1 combined connecting structure be protector 1 profile is made similar substantially to the profile of circuit breaker 2; also be provided with mutually electric input terminal 14 on protector 1, zero line input terminal 17 and zero line outlet terminal 18 also are provided with panel 19; current calibration potentiometer spinner 20 is installed, reset button 22 and function diverter switch 23 on the panel 19.Protector 1 is connected with circuit breaker 2, adopts

screw

8,9 that both are fastenedly connected, and the lower casing 26 of protector 1 is provided with guide rail draw-in groove 6 and is connected with circuit breaker 2 buckles.Like this, the mutually electric input terminal of output line on the protector 13 and circuit breaker 15 is electrically connected, protector output line 3 is outer a guard shield 4, the guard shield clip 5 buckle connection mutually on the clip 5 on it and the upper and lower enclosure 25,26.Trip gear 11 also is installed on protector 1, and the dial 21 that matches with current calibration potentiometer 20 also is installed.The internal structure of protector 1: the one, main circuit board 29, auxiliary circuit board 30 and auxiliary circuit board 31 are installed, indicator light, reset button and function diverter switch are installed on auxiliary circuit board 31, and the control power circuit is installed on the auxiliary line plate 30 and is fixed on the side of lower casing 26; The 2nd, current transformer, zero-sequence transformer are installed in protector 1, be installed in the instrument transformer holddown groove of lower casing 26.The output line of the secondary output line of current transformer, zero-sequence transformer and control power supply is connected respectively on the hook-up wiring receptacle, one connecting line plug is arranged on the main circuit board 29, when upper casing 25 and lower casing 26 were buckled together, the connecting line plug just in time inserted in the hook-up wiring receptacle.Protector 1 three-phase input terminal has three leads to penetrate three current transformers respectively; zero line input terminal 17 have lead that a lead passes with three current transformers totally four leads penetrate zero-sequence transformer 33; lead with protector three-phase input terminal 14 lines leads to the protector outlet then, is connected to the lead that circuit breaker three-phase input terminal 15 is connected with zero line input terminal 17 and connects zero line outlet terminal 18 again.

With reference to Fig. 2, the circuit breaker 2 among the figure is single-phase circuit breakers, is that connecting line guard shield length is different with the difference of three-phase protective device, the quantity difference of current transformer.

With reference to Fig. 3, release drive link 10 inserts in the dropout hole 28 of circuit breaker 2, and screw 9 links together protector 1 and circuit breaker 2.Protector three-phase output line 3 is connected respectively on the circuit breaker three-phase terminal 15, and connecting line guard shield 4 advances connecting line guard shield clip 5 that it is fastened; Protector guide rail draw-in groove 6 is identical with circuit breaker guide rail draw-in groove 7 specifications, is stuck on the fixed mount simultaneously during use.

With reference to Fig. 4, protector 1 is divided into upper casing 25 and lower casing 26, and release 11 is installed on the upper casing 25, and release cover plate positioning head 13 inserts in the release cover plate location hole 43 release cover plate 12 is fixed on the release 11 of upper casing 25; Current calibration potentiometer 34 is fixed on the upper casing 25, indicator light 24, reset button 22 and function diverter switch 23 are installed on the auxiliary circuit board 31, auxiliary circuit board 31 is installed on the main circuit board 29, push upper casing 25 more together, auxiliary circuit board 31 makes indicator light 24, reset button 22 and function diverter switch 23 expose panel 19 in the location automatically after entering location notch 42, main circuit board 29 also obtains the location simultaneously, and main circuit board hold-down screw 39 screws in the main circuit board fixed mount 38; Protector three-phase input terminal 14 has three internal connection lines 37 to penetrate three current transformers 32 respectively, the internal connection line 37 that zero line input terminal 17 has an internal connection line 37 to pass with three current transformers 32 has four internal connection lines 37 and penetrates zero-sequence transformer 33, internal connection line 37 with protector three-phase input terminal 14 lines leads to protector output line 3 then, and the internal connection line 37 that is connected with zero line input terminal 17 connects zero line outlet terminal 18 again; Current transformer 32, zero-sequence transformer 33 are installed in the instrument transformer holddown groove 44 of lower casing 26; The control power supply is installed on the auxiliary circuit board 30, is fixed on the side of lower casing 26; The output line of the secondary output line of current transformer 32, zero-sequence transformer 33 and control power supply is connected respectively on the hook-up wiring receptacle 35, one connecting line plug 36 is arranged on the main circuit board 29, when upper casing and lower casing junction button 27 were buckled together, connecting line plug 36 just in time inserted hook-up wiring receptacle 35.

With reference to Fig. 5, be circuit structure block diagram of the present invention.As shown, current signal sampling circuit connects the signal amplifying circuit of adjusting, and the signal amplifying circuit of adjusting divides four the tunnel to connect current foldback circuit respectively, uneven, open-phase protection circuit, earth leakage protective selected on-off circuit and running status indicating circuit; Current foldback circuit connection heat accumulation attenuator circuit connects the protection lock definiteness again and shows circuit, and uneven, open-phase protection circuit connects the protection lock definiteness again and shows circuit, and the protection lock definiteness shows that circuit connects driving output release circuit; The earth leakage protective selected on-off circuit connects leakage protection circuit; The power supply input connects foregoing circuit through rectification, filtering, voltage stabilizing circuit.

With reference to Fig. 6, be circuit theory diagrams of the present invention.L1, L2, the detected three-phase current signal of L3 coil are through three-phase DB1, the rectification of DB2 bridge on the instrument transformer, and connect three resistance power takings stream signals of RA, RB, RC and C1 filtering, amplify through U1A negative feedback amplifier again, W1 potentiometer setting current, transposing RW1, RW2 determine ull-scale value.The scope of setting current is divided four specification: 0.3-1.2A, 1-4A, 3-12A, 10-40A change RA RB the RC resistance, change RW1, RW2 again and determine each specification ull-scale value, four specifications are the same in the ull-scale value of U1A output.

The current signal of U1A amplification output enters has heat memory inverse time lag overload circuit U1B positive input terminal, when operating current during less than 1.5 times of rated current, U1B exports positive potential through R5, D4 voltage stabilizing, R1, R2, R3, R4 dividing potential drop, and the heat accumulation on C3A, the C3B electric capacity can reach an equilibrium valve; When operating current surpassed 1.5 times, the heat accumulation on C3A, the C3B electric capacity surpasses rated current according to operating current multiple increased in the time ratio, U1C upset output low level when heat accumulation oversteps the extreme limit (benchmark) value, and overload light D8 is bright.

U2D, D2C output counter-rotating simultaneously; Q2 conducting circuit breaker trip; because tripping coil electric current very big (greater than 1A) forces stabilized voltage power supply voltage to drop to U2D upset Q2 shutoff, the U2C output switching activity, U1C, D8 keep malfunction; this moment is as still existing operating current or leakage current; U1D or U3A output electronegative potential overturns U2D by D16 or D22 once more, Q2 once more conducting up to final shutdown; by the time manual reset is depressed S1, the full recovery original state is waited for start once more.

U1A exports the second the road to U2A and carries out relay indicating light control, the U2A negative input end is 0 before the motor starting, and output amplifies for the high level positive feedback to be kept, and indicator light D10 is bright, the negative input of starting back C5 charging U2A is higher than positive input, it is output as low level, and D moves input to low level, the U2A oscillatory work, indicator light D10 flicker, U1C or U2B or U3B move indicator light D10 oppositely to by D during malfunction, and indicator light D10 goes out, and the rear indicator light D10 that resets is bright.

U1A output Third Road is to U1D; the U2B negative input end carries out uneven open phase protection; R14 and R15 dividing potential drop C7 are filtered into U1D positive input benchmark; the phase failure or occur in the phase half period of fault when uneven mutually making U1D upset output high potential than electronegative potential moment; C8 discharges through R16; half period U1D upset later output electronegative potential; D11 conducting C10 discharges by R18; C8 discharges by R16; the U2B positive input terminal continued to drop to when being lower than the negative input end current potential after repeated multiple times like this appearred in fault one phase electronegative potential once more; U2B upset output electronegative potential; overload light D15 is bright; U2D; U2C output counter-rotating simultaneously; Q2 conducting circuit breaker trip; because tripping coil very big (greater than 1A) forces stabilized voltage power supply to drop to U2D upset Q2 shutoff; the U2C output switching activity; U1C; D8 keeps malfunction; this moment is as still existing operating current or leakage current; U1D; U3A exports electronegative potential; by D16 or D22 U2D is overturn once more; Q2 once more conducting up to final shutdown; by the time manual reset is depressed S1, the full recovery original state is waited for start once more.

In the circuit theory diagrams, adopt following components and parts: capacitor C 1, C11 are 2.2 μ F/16V, and capacitor C 3, C25 are 100 μ F/25V, C4, C7, C9, C15, C12, C14 are 1 μ F/50V, and C5 is 22 μ F/16V, and C10 is 10 μ F, C23 is 470 μ F63V, and C24 is 220 μ F16V, and C2 is 473, C6, C16 are 472, and C8, C26 are 224, and C17 is 103, C18 is 154, and C13, C19 are 104, and C20, C21, C22 are 224,250V, DB1, DB2, DB3, DB4, DB5 are MB6S; D1, D2, D3, D5, D6, D7, D9, D11, D12, D13, D14, D16, D17, D19, D20, D21, D22, D24 is 1N4148, D26 is 6.2V/0.5W, D8 is a red light emitting diodes, D10 is a green LED, D15 is a yellow light-emitting diode, D25 is 1N4004, the K1 key switch, Q1 is 2N5551, Q2-2SK3065, R1 R15 R16 R26 R52 be 20K, R2, R7, R8, R25, R48 is 5.1K, R3, R6, R11, R17, R19 is 200K, R4-24K, R5, R21-39K, R9, R34-100K, R10, R46-510 Ω, R12, R20, R23-4.3M, R13-15K, R14-10K, R24 R27 R28 R29 R30 R51-51K, R22, R33-820K, R50-1.5M, R31-150K, R32-390K, R35, R36, R45-2K, R37, R38, R39-330K, R40, R41, R42-1M, R43-1K, R4736K, RA, RB, RC is a pad signal resistance, RW1, RW2 paster potentiometer build-out resistor U1, the integrated LM224 of U2 paster amplifier, the integrated LM258 of U3 paster amplifier, U4, U5, U6 is the integrated TL431 of the integrated voltage stabilizing of paster, the S1 button, W11-10JN WUG KKD, the double contact pin 2 * 4P of J2, the double socket 2 * 4P of J3, the single contact pin of J1, L1, L2, L3 three-phase instrument transformer, the L4-zero-sequence transformer.

Though the present invention only illustrates its feature with an embodiment,,, all belong to protection scope of the present invention so long as combining structure and electronic circuit are supporting in the configuration aspects of circuit and element device, especially protector and circuit breaker.

Claims

1. motor protection circuit breaker, comprise circuit breaker (2), mutually electric input terminal (15), mutually electric outlet terminal (16) zero line outlet terminal (18) and killer switch handle (41) are installed on this circuit breaker (2), it is characterized in that said circuit breaker (2) and protector (1) are combined connecting structures; Protector (1) is provided with mutually electric input terminal (14), zero line input terminal (17) and zero line outlet terminal (18); protector (1) is provided with panel (19), and current calibration potentiometer spinner (20), reset button (22) and function diverter switch (23) are installed on the panel (19).

2. according to the said motor protection circuit breaker of claim 1, it is characterized in that said circuit breaker (2) and protector (1) combined connecting structure are the profile of protector (1) and the appearance similar of circuit breaker (2), adopt screw (8) (9) to be fastenedly connected, the lower casing (26) of protector (1) is provided with guide rail draw-in groove (6) and is connected with circuit breaker (2) buckle in addition, output line (3) on the protector (1) is electrically connected with the mutually electric input terminal of circuit breaker (15), guard shield (4) is arranged outside the protector output line (3), guard shield clip (5) on clip on it (5) and the upper and lower enclosure (25) (26) buckle mutually connects, trip gear (11) also is installed on protector (1) and the dial (21) that matches with current calibration potentiometer knob (20) is arranged, the release transmission driving lever on the protector (1) inserts the circuit breaker tripping hole; Protector (1) is divided into three-phase protective device and single phasing protection device.

3. according to claim 1 or 2 said motor protection circuit breakers, it is characterized in that being equipped with on the said protector (1) main circuit board (29) and auxiliary circuit board 1 (30) and auxiliary circuit board 2 (31), auxiliary circuit board 2 (31) is installed on the main circuit board (29), and indicator light, reset button and function diverter switch are installed on the auxiliary circuit board 2 (31); The control power circuit is installed in auxiliary line plate 1 (30) and goes up and be fixed on the side of lower casing (26); Current transformer, zero-sequence transformer are installed in protector, be installed in the instrument transformer holddown groove of lower casing (26), the output line of the secondary output line of current transformer, zero-sequence transformer and control power supply is connected respectively on the hook-up wiring receptacle, one connecting line plug is arranged on the main circuit board (29), when upper casing (25) and lower casing (26) when being buckled together, the connecting line plug just in time inserts in the hook-up wiring receptacle; Protector (1) three-phase input terminal has three leads to penetrate three current transformers respectively; the zero line input terminal have lead that a lead passes with three current transformers totally four leads penetrate zero-sequence transformer; lead with protector three-phase input terminal line leads to the protector outlet then; connect circuit breaker three-phase input terminal again, the lead that is connected with the zero line input terminal connects the zero line outlet terminal again.

4. according to the said motor protection circuit breaker of claim 3, it is characterized in that being equipped with on the said main circuit board (29) current signal sampling circuit, the signal amplifying circuit of adjusting, divide with current foldback circuit be connected at four the tunnel: the one tunnel then, one the tunnel is connected with uneven, open-phase protection circuit, another road is connected with the earth leakage protective selector switch, and one the tunnel is connected with the running status indicating circuit again; The heat accumulation attenuator circuit is connected with current foldback circuit; the protection lock definiteness shows that circuit is connected with uneven open-phase protection circuit with current foldback circuit simultaneously; also be connected with driving output release circuit; power supply input circuit is electrically connected with rectification, filter regulator circuit, and rectification filtering voltage stabilizing circuit is connected with foregoing circuit respectively.