CN2312537Y - Phase interruption and over current protective arrangement for electric machine - Google Patents

Phase interruption and over current protective arrangement for electric machine Download PDF

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Publication number
CN2312537Y
CN2312537Y CN 97244937 CN97244937U CN2312537Y CN 2312537 Y CN2312537 Y CN 2312537Y CN 97244937 CN97244937 CN 97244937 CN 97244937 U CN97244937 U CN 97244937U CN 2312537 Y CN2312537 Y CN 2312537Y
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circuit
phase
potentiometer
negative pole
resistance
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CN 97244937
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姜廷良
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Abstract

The utility model relates to a phase-interruption and overcurrent protective device for three-phase alternating current motors. The utility model is composed of a signal input and conversion circuit 1, a phase interruption signal detecting and comparing control structure, an overcurrent signal detecting and comparing control circuit 5, a delay execution circuit 6, and a working power supply 7. The utility model is characterized in that the phase-interruption signal detecting and comparing control structure is composed of a bias voltage detecting circuit 2, a bias power supply 3, and a quantizing and comparing control circuit 4. The utility model overcomes the limitation of the protective device of the existing motor, and has the advantages of wide protection range, and reliable protection.

Description

Motor phase failure overcurrent protective device
The utility model relates to a kind of phase failure overcurrent protective device of motor, uses the power input at threephase motor.
For protecting the safe in utilization of motor, prevent to burn out motor because of the phase failure and the overcurrent of input power supply, Recent study is developed the phase failure overcurrent protective device of all multiple-motors.But from theory structure is two types basically, the one, utilize capacitor or transformer to form the neutral point observation circuit, with the line voltage of monitoring three-phase input power supply or the balance of line current, when the phase failure takes place, its three-phase line voltage or line current take place serious uneven, go out voltage or current controling signal from neutral spot check, remove to drive relay after direct or process shaping time-delay is amplified, cut off the power supply of motor, reach the purpose of protection; The 2nd, utilize the instrument transformer secondary coil, detect having or not of three-phase incoming line electric current, to judge whether to have taken place the phase failure.This kind structure is normally the three-phase induction ac voltage signal, become d. c. voltage signal, send into the gate circuit that transistor or integrated circuit are formed again, when open phase fault is not arranged, the gate circuit output low level, motor runs well, when certain opens circuit mutually, gate circuit output high level, control relay after time-delay is amplified, the power supply of cut-out motor.First type protective device; because power supply grid self just exists the imbalance of line current or line voltage; especially the transformer capacity of electricity consumer oneself is less; and under the bigger situation of bearing power; the unbalanced situation of line current or voltage more very; so this control protective device scope of application with direct detection unbalanced signal is very narrow, does not have promotional value substantially, also rarely found on the market have this series products.Second type practical, is the common product in market.But, facts have proved that this type of protector also has bigger limitation.When being based on the phase failure because of such protector; the AC line electric current of assert the instrument transformer primary side be zero or very little numerical value basis on; this situation is confined to the protection that three phase mains only has a motor; perhaps before this protected motor, threephase load is arranged; but that section three phase mains circuit that the phase failure occurs over just between protected motor and the threephase load before it can; if the phase failure occurs in before the threephase load of front; so after the three phase mains input of protected motor become the single phase alternating current power supply of 380V; because the coupling of front load; the electric current of phase failure line is also non-vanishing; but electric current that changes with front load size variation; thereby this class protective device under many circumstances, just do not had protective effect.
The purpose of this utility model exactly in order to overcome the deficiency of above-mentioned existing open-phase protection device for electromotor, provides a kind of protection range wide, the motor phase failure overcurrent protective device of reliable operation.
The utility model is realized by the following technical solutions, it is detected and translation circuit 1 by signal, phase failure signal detects, compares control structure, over-current signal detects and comparison control circuit (5), delay executing circuit 6, working power 7 is formed, and it is characterized in that said phase failure signal detects, compares control structure, by deviation voltage detecting circuit 2, bias supply 3, quantification comparison control circuit 4 constitute; Deviation voltage detecting circuit 2 is by six diode D 15-D 20Form, its circuit connection is: D 15, D 16, D 17Anodal and connect, their negative pole connects D respectively 18, D 19, D 20Positive pole, D 18, D 19, D 20Negative pole and connect; The circuit of bias supply 3 is connected to: from ac buck transformer T time level through diode D 1-D 4Bridge rectifier is through capacitor C 5, C 6Filtering and three terminal regulator IC 1The D.C. regulated power supply that voltage stabilizing constituted, resistance R 4, R 5Series connection back and potentiometer R W1Incorporate this D.C. regulated power supply together into; The circuit that quantizes comparison control circuit 4 connects: the D from deviation voltage detecting circuit 2 18, D 19, D 20Negative pole contact lead in parallel and from bias supply 3 potentiometer R W1Sliding point lead-in wire insert two inputs of photoelectrical coupler GE, two outputs of GE, the one tunnel meets potentiometer R W3An end and insert comparator IC 3In-phase input end, another road connects the positive power source terminal of working power 7, potentiometer R W3Sliding point and its other end short circuit after ground connection, that is connect the negative pole end of working power 7, resistance R 8, R 9Be connected to the positive and negative end of working power 7 after the serial connection, the serial connection point lead-in wire of its two resistance inserts comparator IC 3Inverting input, IC 3Output terminating diode D 21Negative pole, D 21The resistance R of anodal termination delay executing circuit 6 11An end.
Below in conjunction with accompanying drawing the utility model is described further, this Figure of description is the accompanying drawing that the schematic diagram of circuit structure block diagram and the electrical connection of its components and parts combines, the with dashed lines collimation mark shows 1,2,3,4,5,6,7 among the figure, represents respectively that successively its signal detects and translation circuit, deviation voltage detecting circuit, bias supply, quantification comparison control circuit, over-current signal detect comparison control circuit, delay executing circuit and working power.A, B, C are three phase lines of IN380V AC power among the figure, and M is a threephase motor among the figure.The components and parts that signal detects with translation circuit 1 are connected to: from current transformer T L1, T L2, T L3An end each be connected in series diode D respectively 9, D 10, D 11, T L1, T L2, T L3The equal ground connection of the other end, D 9, D 10, D 11Positive terminal and ground between respectively and connect capacitor C 1And resistance R 1, capacitor C 2And resistance R 2, capacitor C 3And resistance R 3, and from D 9, D 10, D 11Positive level guide line receive D respectively 15And D 18Serial connection point and diode D 12Negative pole, D 16And D 19Serial connection point and diode D 13Negative pole, D 17And D 20Serial connection point and diode D 14Negative pole.
The components and parts of deviation voltage detecting circuit 2, bias supply 3, quantification comparison control circuit 4 are electrically connected the front and chatted, no longer repeat.Over-current signal detects, the electrically connecting as of comparison control circuit 5: diode D 12, D 13, D 14Negative pole end point out that with the front that is connected that signal detects translation circuit 1 their positive terminal is connected to resistance R altogether 6An end, R 6The other end be that electricity meets comparator IC 4In-phase end, again with ground end and connecting resistance R 7, resistance R 10With potentiometer R W4Serial connection point electricity meet IC 4End of oppisite phase, R 10, R W4The other end respectively with working power 7 positive and negative () end join R W4Sliding point ground connection, IC 4Output terminating diode D 22Negative pole, D 22Anodal connecting resistance R 11An end.
Electrically connecting as of delay executing circuit 6: resistance R 11The connection front of front end is narrated, and its rear end both electricity meets voltage stabilizing didoe D wPositive terminal, again and between the ground end and be connected to resistance R 12With capacitor C 7, D wThe control of negative pole end and controllable silicon SCR extremely link to each other, the SCR minus earth, anode is succeeded electrical equipment K 2An end of coil, K 2The positive terminal of another termination working power 7 of coil.Relay K 2A pair of normally-closed contact K 2-0One termination C cross streams power supply, another termination A.C. contactor K 1An end of magnet exciting coil, another termination of this coil normally closed (stopping) button AN 2An end, AN 2Another termination is often opened (startup) button AN 1An end, AN 1Another termination B cross streams power supply, at AN 1Two ends also and meet K 1A pair of normally opened contact K 1-4, K 1Three couples of normally opened contact K 1-1, K 1-2, K 1-3, be connected on respectively between the three-phase incoming line of A, B, C three-phase alternating-current supply and motor M.
Working power 7 is from four the diode D in another secondary coil two ends of ac buck transformer T 5-D 8Bridge rectifier, capacitor C 4Filtering, three terminal regulator IC 2The common DC power supply of voltage stabilizing.It is comparator IC 3, IC 4And the working power of controllable silicon SCR.
The course of work of the present utility model and principle are summarized as follows, when pressing start button AN 1After, K 1Get electric adhesive, its K of often making war 1-1, K 1-2, K 1-3Closure, the three-phase input power connection of motor M, motor rotation.K 1-4Closure makes K 1The control loop self-locking.Under normal circumstances, promptly during the three-phase alternating current mobile equilibrium, the ac induction voltage that detects the current transformer gained of translation circuit 1 through signal also equates, this alternating voltage input signal is respectively through the diode D of same specification model 9, D 10, D 11Rectification, C 1, C 2, C 3Filtering, load resistance R 1, R 2, R 3After, the d. c. voltage signal that conversion obtains is made as V 1, V 2, V 3Also equate.After they sent into deviation voltage detecting circuit 2, because of there not being deviation voltage, so the deviation voltage detecting circuit is output as 0, and then circuit was not thereafter all worked the motor normal operation.When three-phase current unbalance, then detect translation circuit 1, the above-mentioned d. c. voltage signal V that conversion obtains through signal 1, V 2, V 3Unequal, establish V 1＞V 2, this difference voltage signal, through deviation voltage detecting circuit 2, export one on negative just down deviation voltage, by potentiometer R W2After connecting by the bias voltage of bias supply 3 outputs, be added in the input that quantizes photoelectrical coupler GE in the comparison control circuit 4, so the input at GE has direct current to flow through, if this electric current is Ig, when the voltage of bias supply is certain value, then Ig changes with the variation of deviation voltage, and proportional example relation, and deviation voltage is along with the unbalanced difference size variation of three-phase current.So Ig changes with the extent of three-phase alternating current imbalance, and then a resistance that changes with the extent of three-phase alternating current imbalance, this resistance and R have been produced at the output of GE W3Series connection forms bleeder circuit, works as R W3When being transferred to certain value, the voltage V at its two ends then Rw3Only direct ratio changes with the difference size of unsymmetrical current, so V Rw3Also can be described as deviation signal voltage, it sends into IC 3In-phase end, work as V Rw3Value greater than by R 8, R 9The reference voltage V that dividing potential drop produces R9The time, IC 3The output high level is through D 21, R 11To C 7V is worked as in charging C7Value reach D wPuncture voltage the time, D wConducting triggers the SCR conducting, K 2Get electric adhesive, its normally closed some K 2-0Disconnect K 1Dead electricity, its K of often making war 1-4Disconnect and remove self-locking, K 1-1, K 1-2, K 1-3Disconnect, motor M dead electricity is protected.
At bias power supply circuit R is set W1, purposes is by adjusting R W1Can make the operating state of deviation voltage detecting circuit 2, be arranged on oppositely on the arbitrary position in the forward conduction interval, be provided with a gate voltage with regard to being equivalent to the input of GE like this, the value that makes this gate voltage is unbalance with three-phase alternating current and the deviation voltage of generation big or small corresponding.When deviation voltage during less than this gate voltage, by as can be known preceding, IC 3Output low level, Dw can breakdown conducting, and delay executing circuit 6 is not worked; Though and when the phase failure or the not phase failure, three-phase current is serious when uneven, deviation voltage is greater than gate voltage, and delay executing circuit 6 will be worked as previously mentioned, and motor is protected.
When implementing the utility model, be preferably in the D of deviation voltage detecting circuit 2 15, D 16, D 17The R of anodal and contact and bias supply 3 4And R 5Serial connection point between seal in potentiometer R W2, it is the current-limiting resistance that adds the deviation voltage of GE input, adjusts R W2Resistance, can play the effect of GE of adjusting to the sensitivity of deviation voltage reacting condition.
Because current foldback circuit is to adopt prior art, its operating principle no longer repeats.
When implementing the utility model, the selection of its components and parts model, specification is as follows: ac buck transformer T: specification is
Figure Y9724493700091
W; Current mutual inductor coil TL 1, TL 2, TL 3, available μ 04000 magnet rings from around, its parameter is decided according to the power of motor M; Used diode removes D 5, D 6, D 7, D 8Select for use outside the IN4001, other all selects IN4148 for use, voltage stabilizing didoe D wSelect 0.5W/6V for use, controllable silicon SCR is selected the BTl69 type for use; The three terminal regulator ic chip 1, IC 2Select 78L06 and 7812 types respectively for use.The comparator ic chip 3, IC 4All can select 1/4LM324 for use; K 1Select for use
Figure Y9724493700092
General A.C. contactor, K 2Select the HG4123-2-12V relay for use; GE selects the photodiode output type for use; R W1, R W2All select the WS20 solid potentiometer for use; R W3, R W4All select WS for use 1Solid potentiometer; The all available 1/8W fixed carbon resister of all resistance; Capacitor C 1, C 2, C 3Can be 10 μ/16V, C 4Can be 330 μ/25V, C 5, C 6, C 7Can be 220 μ/16V.
From the above mentioned; because of what the utility model detected is not having or not of each phase current; but the deviate of maximum and minimum value in the three-phase current; and this extent of deviation has been carried out quantizing relatively, and this just both can detect the deviation that causes because of the phase failure, and gave automatic power-off protection; also can be the serious imbalance of three phase mains because of electrical network self; and other laod unbalance cause might cause the situation that motor damages, detect, and provide automatic power-off protection.And this protection range can be adjusted easily according to actual conditions.The phase failure state of influential protected object all list protection range in, so it is wide to the utlity model has protection range, protect reliable advantage and good effect.

Claims (2)

1, a kind of motor phase failure overcurrent protective device, it is detected and translation circuit (1) by signal, phase failure signal detects, compares control structure, over-current signal detects, comparison control circuit (5), delay executing circuit (6), working power (7) is formed, and it is characterized in that said phase failure signal detects, compares control structure, is made of deviation voltage detecting circuit (2), bias supply (3), quantification comparison control circuit (4); Deviation voltage detecting circuit (2) is by six diode D 15～D 20Form, its circuit connection is: D 15, D 16, D 17Anodal and connect, their negative pole is connected in series D respectively 18, D 19, D 20Positive pole, D 18, D 19, D 20Negative pole and connect; The circuit of bias supply (3) is connected to: from ac buck transformer T time level through diode D 1～D 4Bridge rectifier is through capacitor C 5, C 6Filtering and three terminal regulator IC 1Voltage stabilizing gained D.C. regulated power supply, resistance R 4, R 5Series connection back and potentiometer R W1Be parallel to this D.C. regulated power supply together; The circuit that quantizes comparison control circuit (3) connects: the D from deviation voltage detecting circuit (2) 18, D 19, D 20Negative pole and contact lead and potentiometer R from bias supply (3) W1Sliding point lead-in wire insert two inputs of photoelectrical coupler GE, two outputs of GE, the one tunnel meets potentiometer R W3An end and insert comparator IC 3In-phase input end, another road connects the positive power source terminal of working power (7), potentiometer R W3Sliding point and its other end short circuit after ground connection, that is connect the negative pole end of working power, resistance R 8, R 9Be connected to the positive and negative end of working power (7) after the serial connection, both serial connection point lead-in wires insert comparator IC 3Inverting input, IC 3Output terminating diode D 21Negative pole, D 21Positive pole connect resistance R in the delay executing circuit (6) 11An end.
2, motor phase failure overcurrent protective device as claimed in claim 1 is characterized in that the D in deviation voltage detecting circuit (2) 15, D 16, D 17Anodal and contact, with the R of bias supply (3) 4, R 5Serial connection point between connection in seal in potentiometer R W2
CN 97244937 1997-12-01 1997-12-01 Phase interruption and over current protective arrangement for electric machine Expired - Fee Related CN2312537Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 97244937 CN2312537Y (en) 1997-12-01 1997-12-01 Phase interruption and over current protective arrangement for electric machine

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Application Number Priority Date Filing Date Title
CN 97244937 CN2312537Y (en) 1997-12-01 1997-12-01 Phase interruption and over current protective arrangement for electric machine

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CN2312537Y true CN2312537Y (en) 1999-03-31

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CN 97244937 Expired - Fee Related CN2312537Y (en) 1997-12-01 1997-12-01 Phase interruption and over current protective arrangement for electric machine

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100459353C (en) * 2002-06-27 2009-02-04 陈德新 Electric machine protective apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100459353C (en) * 2002-06-27 2009-02-04 陈德新 Electric machine protective apparatus

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C19 Lapse of patent right due to non-payment of the annual fee
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