CN102810841A - Residual current protective device and circuit breaker - Google Patents
Residual current protective device and circuit breaker Download PDFInfo
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- CN102810841A CN102810841A CN2011101437623A CN201110143762A CN102810841A CN 102810841 A CN102810841 A CN 102810841A CN 2011101437623 A CN2011101437623 A CN 2011101437623A CN 201110143762 A CN201110143762 A CN 201110143762A CN 102810841 A CN102810841 A CN 102810841A
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Abstract
The invention provides a residual current protective device, which particularly comprises an inverse-time delaying module (125) and an additional delaying module (40). When a residual current sample signal (Sr) is greater than a second preset value, the additional delaying module delays the sample signal; and a third signal (S3) is outputted from an output end of the additional delaying module so as to trigger an actuating mechanism. The second preset value corresponds to a sample value of residual current which enables a residual current detector to be in a saturated state; and when the residual current detector is in the saturated state, the time for the third signal (S3) to reach a trigger preset value is shorter than required time for a second signal (S2) outputted by the inverse-time delaying module to reach a first preset value. When a magnetic core element in the residual current detector is saturated, the residual current protective device can guarantee that a tripping mechanism of a circuit breaker is driven to switch off a circuit within a safety standard set time.
Description
Technical field
The present invention relates to a kind of Aftercurrent protecting equipment, relate in particular to a kind of Aftercurrent protecting equipment that has the deferred action function.The present invention also provides the circuit breaker with this Aftercurrent protecting equipment.
Background technology
Residual current circuit breaker is used for when detecting circuit residual current takes place, control executing mechanism (like the tripping mechanism of circuit breaker) open circuit or give the alarm.Residual current circuit breaker utilizes the detecting unit (for example zero sequence current mutual inductor ZCT) of Aftercurrent protecting equipment to detect usually and obtains reacting the big or small sampled signal of residual current (or title " leakage current "); And with amplifying in control circuit of this signal input; And sampled signal after will amplifying and reference threshold contrast; When the sampled signal after amplifying equaled reference threshold, triggering signal of control circuit output made actuator's action.Present above-mentioned control circuit is integrated into an integrated circuit (for example IC M54123) usually.
Some like the situation that adopts the protection of multistage leakage switch under, when the electric leakage situation appears in subordinate's leakage switch, will cause that the superior and the subordinate's leakage switch moves simultaneously, thereby cause the whole system dead electricity.Occur for fear of this situation, need higher level's leakage switch to have inverse time characteristic, to prolong the operate time of leakage switch.One Chinese patent application CN101741049A discloses a kind of controller of Aftercurrent protecting equipment.Fig. 1 is the structure chart of this Aftercurrent protecting equipment (RCD).As shown in the figure, this RCD comprises residual current detector 110, control circuit 120, actuator 130.Control circuit 120 specifically comprises an amplifying circuit 121, a circuits for triggering 123 and an inverse time-lag circuit 125, and wherein amplifying circuit 121 is integrated on the integrated circuit with circuits for triggering 123 generally speaking, for example IC M54123.Residual current detector 110 can detect the residual current that supply line takes place, and exports a sampled signal S
rTo the pin 1 and pin 2 of integrated circuit, that is, and the input of amplifying circuit.As required, sampled signal S
rCan also be through an amplitude limiter circuit, so that the size of its output signal is suitable for being input to the pin 1 and pin 2 of integrated circuit.Amplifying circuit 121 in integrated circuit amplifies the sampled signal difference, and amplifies pulse signal S through pin 4 outputs one of integrated circuit
1To inverse time-lag circuit 125.Inverse time-lag circuit 125 utilizes the time-delay of charging of 10 pairs of signals from pin 4 of capacitor C, and to drive signal S of pin 5 outputs of integrated circuit
2, i.e. voltage swing on the capacitor C 10.As this drive signal S
2Reach first preset value that is provided with in the integrated circuit, circuits for triggering 123 are through triggering signal (S of pin 7 outputs
T) give actuator 130, so that carry out the action of threading off.Generally speaking, the delay time of inverse time-lag circuit is adjustable in 0～40ms, and representative value is 10ms.
(A) among Fig. 2 shown that to (D) current value that samples in the residual current detector as shown in Figure 1 110 (like, zero sequence current mutual inductor) concerns with the real surplus change in current.Among Fig. 2 (A) shown that residual current exists but numerical value hour; Residual current detector 110 detected current waveforms, at this moment, residual current detector; The magnetic core that is zero sequence current mutual inductor is operated in the range of linearity, and the current waveform in the residual current detector is sinusoidal wave.(B) among Fig. 2 shown when residual current is big; Current waveform in the residual current detector; This moment, the magnetic core of zero sequence current mutual inductor was operated in the range of linearity; And the current waveform in the residual current detection circuit is sinusoidal wave, compares with figure (A), and the amplitude of the electric current among the figure (B) in the residual current detector increases.(C) among Fig. 2 shown when residual current further increases; Current waveform in the residual current detector; This moment, the magnetic core of zero sequence current mutual inductor was saturated; And the current waveform in the residual current detector is sinusoidal wave for distortion, compares and schemes (B), and the effective value of the electric current among the figure (C) in residual current detector reduces.(D) among Fig. 2 shown when residual current further increases again; Current waveform in the residual current detector; This moment, the magnetic core degree of depth of zero sequence current mutual inductor was saturated; And the current waveform in the residual current detector is sinusoidal wave for the class impulse type of distortion, compares and schemes (C), and the effective value of the electric current among the figure (D) in residual current detection circuit sharply reduces.
Fig. 3 has shown the variation relation of the pulse duration of integrated circuit pin 4 outputs with detected residual current size.As shown in the figure, before the magnetic core of zero sequence current mutual inductor is saturated, along with the increase of residual current; The detected residual current of zero sequence current mutual inductor increases; Thereby the signal pulse width after amplifying increases thereupon, but after the magnetic core of zero sequence current mutual inductor is saturated, along with the increase of residual current; The effective value of the detected electric current of zero sequence current mutual inductor reduces, thereby the signal pulse width after amplifying reduces.And, if there is amplitude limiter circuit, can accelerate further then to occur that residual current increases and situation that the pulse duration of pin 4 outputs reduces.
Fig. 4 has shown the variation relation of the delay time of real surplus size of current and inverse time-lag circuit.Generally speaking; The magnetic core of zero sequence current mutual inductor is worked under unsaturated state; Along with the increase of residual current, the increase of the amplification pulse signal width of integrated circuit pin 4 outputs, the delay time of inverse time-lag circuit then reduces because of the increasing of charging current is corresponding.If but the magnetic core of zero sequence current mutual inductor is when running into bigger residual current; Magnetic core moment is saturated; This moment is as shown in Figure 3, though the real surplus electric current is also increasing, the amplified pulse signal width of pin 4 outputs diminishes; This so make the corresponding increase of delay time of inverse time-lag circuit, thereby surpass the regulation of safety standard probably and bring danger the opening time of circuit breaker.
Summary of the invention
The purpose of this invention is to provide a kind of Aftercurrent protecting equipment; When making magnetic core element in residual current detector saturated, the tripping mechanism that the controller of Aftercurrent protecting equipment can guarantee in the safety standard official hour, to drive circuit breaker is accomplished the disconnection of circuit.
The invention provides a kind of device that is used for residual current protecting.This Aftercurrent protecting equipment comprises: a residual current detector, be used for the residual current of circuit is sampled, and obtain residual current sampled signal Sr; One control circuit is used for sending a triggering signal during greater than first preset value in the residual current sampled signal; One actuator carries out action in response to said triggering signal; Wherein, said control circuit comprises: an amplification module, and this amplification module amplifies the residual current sampled signal, and first signal after the output amplification; One trigger module is used for exporting said triggering signal during greater than said first preset value at its input signal; One inverse time-lag module is used for said first signal is carried out the inverse time lag delay, and exports the input of secondary signal to the said trigger module after delaying time from its output; One additional delay module (40), it is in the residual current sampled signal during greater than second preset value, to this sampled signal (S
r) delay time, and export the 3rd signal (S at its output
3) to the input of said trigger module; Wherein said second preset value is corresponding to making said residual current detector get into the sampled value of the residual current of saturation condition; Wherein, When said residual current detector was in saturation condition, the time that said the 3rd signal reaches said first preset value reached the said first preset value required time less than said secondary signal.This Aftercurrent protecting equipment of sampling can be so that the magnetic core element in residual current detector be when saturated, and the tripping mechanism that Aftercurrent protecting equipment can guarantee in the safety standard official hour, to drive circuit breaker is accomplished the disconnection of circuit.
In the another kind of schematically execution mode of Aftercurrent protecting equipment, said additional delay module comprises a start unit and a charge/discharge unit; Said start unit starts when said residual current sampled signal reaches said second preset value and exports a charging signals and give charge/discharge unit; Said charge/discharge unit by said charging signals charging, and is exported said the 3rd signal.Preferably, said charge/discharge unit is the RC charge-discharge circuit.And its time of discharging and recharging is designed to be suitable for when continuing residual current to occur, can make that said the 3rd signal reaches said first preset value.The selection of this RC charge-discharge circuit can be saved and is used to detect the auxiliary circuit whether residual current continues.
In another schematic execution mode of Aftercurrent protecting equipment, said start unit comprises a switch element, and the cut-in voltage of this switch element is corresponding to making said residual current detector get into the sampled value of the residual current of saturation condition.Preferably, said switch element is a kind of inverting element, is used for converting the residual current sampled value into be suitable for said RC charge-discharge circuit charging signals (S
C).
More preferably, said switch element is a photoelectrical coupler (N2).In addition, the size of said second preset value is corresponding to five times of specified residue leakage current.Generally speaking, optocoupler is used for the isolation of signal under the little current conditions.For example optocoupler generally uses at the state of operating current as 55mA.But herein, optocoupler can be operated under the hundreds of milliampere, and for example the conducting electric current can be approximately 550mA.This is a kind of comparatively special use of optocoupler.So design did not all appear in RCD design before.Use optocoupler multiple benefit to be arranged as start unit.For example; The cut-in voltage of photoelectrical coupler is approximately 1V, and this value corresponds essentially to the residual current size at the saturation point place of general zero sequence current mutual inductor, for example five of specified residual current times; Therefore this cut-in voltage can be directly as second preset value, and need not other auxiliary circuits.In addition, because of photoelectrical coupler has the power conversion ability, it can realize that current signal arrives the conversion of control signal (charging signals).And photoelectrical coupler can realize that the electricity between the charhing unit of residual current detector and additional delay unit isolates, thereby avoids unnecessary interference or big electrical injuries.Thus, use photoelectrical coupler to simplify circuit structure greatly here, also reduced the circuit debugging difficulty.
The present invention also provides a kind of circuit breaker that uses the controller of above-mentioned residual current device.
Hereinafter will be with clear and definite understandable mode, and the accompanying drawings preferred embodiment further specifies the controller of residual current device and above-mentioned characteristic, technical characterictic, advantage and the implementation thereof of circuit breaker thereof.
Description of drawings
Following accompanying drawing is only done schematic illustration and explanation to the present invention, not delimit the scope of the invention.
Fig. 1 has shown the structural representation of existing Aftercurrent protecting equipment.
(A) among Fig. 2 shown that to (D) sample rate current in the residual current detector is with real surplus electric current variation relation in the residual current device shown in Figure 1.
Fig. 3 has shown the variation relation of the pulse duration of integrated circuit pin 4 outputs shown in Figure 1 with the residual current size.
Fig. 4 has shown the variation relation of the size of residual current in the Aftercurrent protecting equipment shown in Figure 1 and the delay time of inverse time-lag circuit.
Fig. 5 is the structural representation of a kind of exemplary embodiment of Aftercurrent protecting equipment according to an embodiment of the invention.
Fig. 6 has shown the delay time of Aftercurrent protecting equipment and the relation of residual current size.
Fig. 7 is the electrical block diagram of Aftercurrent protecting equipment exemplary embodiment.
Label declaration
110 residual current detector
120 control circuits
121 amplification modules
123 trigger modules
125 inverse time-lag modules
40 additional delay modules
410 start units
420 delay units
S
rThe residual current sampled signal
S
1First signal
S
2Secondary signal
S
3The 3rd signal
S
TTriggering signal
S
CCharging signals
Embodiment
Understand for technical characterictic, purpose and effect to invention have more clearly, contrast description of drawings embodiment of the present invention at present, identical label is represented identical or structural similarity but the identical part of function in each figure.
For making drawing succinct, only schematically shown out the part relevant among each figure with the present invention, they do not represent its practical structures as product.In addition, so that drawing succinctly is convenient to understand, the parts that in some figure, have same structure or function have only schematically illustrated one of them, or have only marked one of them.
Fig. 5 is the structural representation of Aftercurrent protecting equipment according to an embodiment of the invention.In Fig. 5, omitted the part identical, like actuator with Fig. 1.As shown in the figure; Similar with Fig. 1; Aftercurrent protecting equipment shown in Figure 5 comprises residual current detector 110; Amplification module 121, inverse time-lag module 125, a trigger module 123, wherein amplification module 121 can be integrated on the integrated circuit with trigger module 125, and is as shown in Figure 1.Different with Fig. 1, device shown in Figure 5 also comprises an additional delay module 40.
Wherein amplification module 121 can receive the residual current sampled signal Sr from residual current detector (like zero sequence current mutual inductor) 110, and this sampled signal also can be through the signal after the amplitude limiting processing.121 couples of sampled signal S of amplification module
rAfter the processing and amplifying, one first signal S of its output output
1The input of inverse time-lag module 125 can be electrically connected with the output of amplification module 121, and inverse time-lag module 20 can be imported the first signal S
1, to the first signal S
1After carrying out delay process, inverse time-lag module 20 exportable secondary signal S
2, wherein delayed processing circuit is for example as shown in Figure 1.Why being called reverse time delay is because its delay time reduces along with the increase of input signal.
The input signal of trigger element 123 comprises secondary signal S
2And/or the 3rd signal S
3, be provided with one first preset value in the trigger element 123, as secondary signal S
2Or the 3rd signal S
3When reaching first preset value, the actuator 130 of trigger module 123 in residual current sends triggering signal S
TMake its action, break off the connection of supply line.Residual current continues to exist in supply line, and the residual current detecting unit is saturated, and secondary signal S
2With the 3rd signal S
3All under the situation of sustainable growth, the 3rd signal S
3Second delay time that arrives first preset value is less than secondary signal S
2Arrive first delay time of first preset value.
The sensors work of residual current device is reacted the sampled signal S of residual electricity flow valuve size this moment under unsaturated state generally speaking
rDeficiency so that additional delay module 40 start, thereby have only 125 work of inverse time-lag module, and inverse time-lag module 125 output signal S
2The delay time that arrives first preset value shortens with the increase of residual current, make Aftercurrent protecting equipment can be in safety time the connection of disjunction supply line.When the detector of the residual current device of passing through in the supply line is saturated, the sampled signal S of reaction residual electricity flow valuve size
rThrough changing the first signal S into after amplitude limit and amplification module 121 processing
1In the input inverse time-lag module 125, simultaneously, sampled signal S
rDirectly input additional delay module 40 makes its work.
Fig. 6 has shown the delay time and the big or small relation of residual current of the controller of residual current device shown in Figure 5; As shown in Figure 6; After the detector of residual current device is saturated; The delay time of inverse time-lag module and additional delay module increases with the increase of residual current; But, make the pairing curve of RCD move from saturated the lighting of magnetic core element towards the negative sense of delay time axle with additional delay module because the delay time that the 3rd signal of additional delay module output this moment arrives first preset value arrives the delay time of first preset value less than the secondary signal of inverse time-lag module output.Thus; The curve corresponding that the delay time of Aftercurrent protecting equipment is represented from dotted line with the inverse time-lag module; Move down into additional delay module 40 pairing block curves; Thereby under the residual current detector saturation condition, shortened the delay time of Aftercurrent protecting equipment, guaranteed the connection of its disjunction supply line in safe range.
As shown in Figure 5, additional delay module 40 comprises a start unit 410 and a delay unit 420, and start unit 410 inputs can receive said sampled signal S
r, and this start unit is provided with one second preset value, as sampled signal S
rWhen arriving second preset value, charging signals S of start unit output
CTo delay unit 420, delay unit receives and handles charging signals S
CExportable one the 3rd signal S in back
3
The start unit 410 of additional delay module 40 can realize that the input of photoelectrical coupler N2 can receive sampled signal S by a photoelectrical coupler N2
r, but have only the S of working as
rValue during greater than the conducting voltage of photoelectrical coupler input, the output of photoelectrical coupler is just exported charging signals S
CTo delay unit 420.Generally speaking, optocoupler is used for the isolation of signal under the little current conditions.The conducting electric current that for example optocoupler is general is the state of 55mA.But herein, optocoupler is operated under the big electric current (like the hundreds of milliampere), and for example its conducting electric current can be at 550mA.This is a kind of comparatively special use of optocoupler.So design did not all appear in RCD design before.Use optocoupler that multiple benefit is arranged.For example; The cut-in voltage of photoelectrical coupler is approximately 1V, and this value corresponds essentially to the residual current size at the saturation point place of general zero sequence current mutual inductor, for example five of specified residual current times; Therefore this cut-in voltage can be directly as second preset value, and need not other auxiliary circuits.In addition, because of photoelectrical coupler has the power conversion ability, it can realize that current signal arrives the conversion of control signal (charging signals).And photoelectrical coupler can realize that the electricity between the charhing unit 420 of residual current detector 110 and additional delay unit isolates, thereby avoids unnecessary interference or big electrical injuries.Thus, use photoelectrical coupler to simplify circuit structure greatly here, also reduced the circuit debugging difficulty.
Here, photoelectrical coupler N2 serves as a control charging signals S
CSwitch element, this switch element has the transducing function, is about to electric energy and converts luminous energy into, and then luminous energy becomes electric energy again, and converts current signal into control signal.Certainly, also can adopt other transducing mode as required, for example other modes of magnetic couple or the like.
Delay unit 420 shown in Fig. 5 can be specially a RC charge-discharge circuit.Here in order to simplify circuit design, discharge and recharge the time, i.e. delay time and designed RC especially.In embodiments of the present invention, delay unit 420 receptions are from the residual current sampled signal Sr of the detector under the saturation condition 110.Shown in (D) among Fig. 2, sampled signal Sr at this moment is rendered as the narrow signal of similar pulse because of the degree of depth is saturated, but not the sine wave during unsaturation.The time of discharging and recharging of RC charge-discharge circuit is designed to when a plurality of class pulse signals shown in Fig. 2 (D) are accumulated on the charging capacitor, and the output signal of RC charge-discharge circuit just might reach first preset value.In other words, the RC time of discharging and recharging is designed to detecting first preset value that RC charge-discharge circuit when residual current occurring continuously just might reach triggering.Thus, circuit design can be further simplified in the design of delay unit 420, is used to detect the testing circuit whether residual current continues existence because it has saved.
Fig. 7 is the electrical block diagram of a concrete exemplary embodiment of Aftercurrent protecting equipment.As shown in the figure, delay unit 420 comprises a RC charge-discharge circuit 422, and the input of RC charge-discharge circuit 422 can be electrically connected with the output of start unit 410 (optocoupler N2), when receiving charging signals S
CAfter, begin to export the 3rd signal S after the time-delay of charge-discharge circuit experience a period of time
3. if residual current continues to exist, and receives charging signals S certainly
CRise, behind second delay time, the voltage at capacitor C 6 two ends reaches first preset value.Second delay time is made up of the time constant decision of charging circuit resistance R 16 and capacitor C 6.Through regulating the numerical value of resistance R 16 and capacitor C 6, the length that can regulate second delay time.After residual current disappeared, the capacitor C 6 after the charging was through the R17 discharge, and wherein the value of R17 is hundreds of K Ω, is preferably 550K Ω, and the value of C6 is preferably 55uF at tens uF, and the value of R16 is preferably 12K Ω at tens K Ω.
The residual current sampled value that second preset value that is provided with in the start unit 410 and the magnetic core that makes current transformer are saturated is corresponding, and when promptly the size of residual current can make magnetic core saturated, charging signals S was also exported in start unit 410 startups
CTo delay unit 420, if the big or small deficiency of residual current so that magnetic core element when saturated, start unit 410 does not start, additional delay module 40 is not worked.In a kind of exemplary embodiment of the controller of residual current device, the size of second preset value equals five times of specified residual current.
In a kind of exemplary embodiment of the controller of residual current device; Amplification module and trigger module are integrated on the leakage current protection control chip IC M54123; But also can use on other leakage current protection control chips, for example M54123L, VG54123, M54122L, M54133FP, IL7551 and GL7551 etc.In exemplary embodiment shown in Figure 7, the M54123 of integrated amplification module and trigger module has eight pins, and wherein pin 1 and 2 is the input of differential amplifier; Pin 3 is an earth terminal; Pin 4 is the output of differential amplifier; Pin 5 is the latch circuit input of (or claiming latch cicuit); Pin 6 is the noise suppressed end; Pin 7 is the output of latch circuit; Pin 8 is a power end.
Combine Fig. 7 that the course of work of Aftercurrent protecting equipment is described at present.When residual current detector does not detect residual current and exists; The pin 4 of integrated circuit M54123 does not amplify pulse signal output; Make the triode Q3 of inverse time-lag module 125 turn-off, and triode Q2 conducting owing to the existence of voltage source V DD, this moment, capacitor C 10 can't be charged.
In residual current detector, detecting residual current exists; And because of the size of residual current does not make in the residual current detector magnetic core element of zero sequence current mutual inductor saturated (for example; The size that is residual current in the present embodiment is less than five times specified residual current) and can not make optocoupler N2 conducting the time, residual current detector is to the pin 1 of integrated circuit M54123 and the sampled signal S of pin 2 output residual currents
R, this sampled signal can be passed through amplitude limiting processing, after the processing of this sampled signal through the inner differential amplifier of integrated circuit M54123, at the pin 4 outputs first signal S
1Arrive the base stage of the triode Q3 of inverse time-lag module 20, make triode Q3 conducting, thereby triode Q2 is turn-offed, voltage source V DD begins to make the voltage at capacitor C 10 two ends constantly increase to capacitor C 10 chargings.Simultaneously, inverse time-lag module 20 is to the voltage of the pin 5 output capacitance C10 of integrated circuit M54123, i.e. secondary signal S
2, the real-time comparison secondary signal S of latch circuit that integrated circuit M54123 is inner
2With first preset value, when the magnitude of voltage of capacitor C 10 equaled first preset value, latch circuit made the controllable silicon Q1 conducting that links to each other with pin 7, thereby triggers tripping mechanism through high level of pin 7 outputs of integrated circuit M54123.Can adjust first delay time of inverse time-lag module 20 through the size of control capacittance C10 and resistance R 12.
When residual current disappeared, the amplification pulse signal of pin 4 outputs of integrated circuit M54123 disappeared, and makes triode Q3 turn-off; The Q2 conducting; Capacitor C 10 begins through resistance R 12 discharges, and the voltage at capacitor C 10 two ends descends, and triggers the action of threading off when avoiding detecting leakage current once more immediately.
The size of residual current does not make when the magnetic core of zero sequence current mutual inductor is saturated in the residual current detector, and residual current detector is exported the sampled signal S of residual current equally
r(without amplitude limit) to the start unit 410 of additional delay module 40, i.e. the input of optocoupler N2, but this moment sampled signal S
rBig or small deficiency so that optocoupler N2 conducting (promptly not reaching second preset value), this moment, additional delay module 40 delay unit 420 was not worked, and did not have the 3rd signal S
3Output.
When the size of residual current during near the saturation point of zero sequence current mutual inductor (for example near specified leakage current five times), optocoupler N2 conducting, optocoupler N2 output charging signals S
CTo the charging circuit 422 of delay unit 420, capacitor C 6 begins through resistance R 16 chargings.But if continuous big residual current do not occur, then can cause optocoupler N2 ON time not enough this moment, just begins discharge thereby the voltage of capacitor C 6 can not charge to first preset value.In this case, the delay time of Aftercurrent protecting equipment still leans on first delay time decision of inverse time-lag module 125.
When the size of residual current makes that the magnetic core of zero sequence current mutual inductor is saturated in the residual current detector, the sampled signal S of residual current detector output residual current
RTo additional delay module 40 start units 410, i.e. the input of optocoupler N2 exports the pin 1 and pin 2 of integrated circuit M54123 simultaneously to.This moment sampled signal S
RSize make optocoupler N2 conducting and ON time long enough, output charging signals S
CTo the RC charge-discharge circuit 422 of delay unit 420, capacitor C 6 begins charging through resistance R 16, makes the voltage at capacitor C 6 two ends constantly increase, and additional delay module 40 is to the voltage of the pin 5 output capacitance C6 of integrated circuit M54123, i.e. the 3rd signal S simultaneously
3, real-time comparison the 3rd signal S of latch circuit that integrated circuit M54123 is inner
3With first preset value.At this moment; Because the 3rd signal S3 reaches the time that the time of first preset value is designed to be shorter than secondary signal S2; Thereby the magnitude of voltage of capacitor C 6 will try to be the first and reach first preset value, and the high level of pin 7 outputs that makes latch circuit pass through integrated circuit M54123 triggers the action of threading off.When residual current disappears or makes no longer that the magnetic core of zero sequence current mutual inductor is saturated in the residual current detector; Optocoupler N2 turn-offs; Capacitor C 6 begins through resistance R 17 discharges, and the voltage at capacitor C 6 two ends descends, and triggers the action of threading off when avoiding detecting leakage current once more immediately.Can adjust second delay time of additional delay module 40 through the size of control capacittance C6 and resistance R 16 and R17.
When capacitor C 6 began to charge, the capacitor C 10 of inverse time-lag module 20 also began charging.But this moment is because charging signals is different separately, and the charging interval of capacitor C 6 is less than the charging interval of capacitor C 10, makes the 3rd signal S
3Prior to secondary signal S
2Equal first preset value, thereby shortened the triggered time of tripping mechanism.
The present invention also provides the residual current device of the controller that uses above-mentioned residual current device.
The present invention also provides the circuit breaker of the controller that uses above-mentioned residual current device.
In this article, " schematically " expression " is served as instance, example or explanation ", should any diagram, the execution mode that be described to " schematically " in this article be interpreted as a kind of preferred or have more the technical scheme of advantage.
Be to be understood that; Though this specification is described according to each embodiment; But be not that each embodiment only comprises an independently technical scheme, this narrating mode of specification only is for clarity sake, and those skilled in the art should make specification as a whole; Technical scheme among each embodiment also can form other execution modes that it will be appreciated by those skilled in the art that through appropriate combination.
The listed a series of detailed description of preceding text only is specifying to feasibility embodiment of the present invention; They are not in order to restriction protection scope of the present invention, allly do not break away from equivalent embodiment or the change that skill of the present invention spirit done and all should be included within protection scope of the present invention.
Claims (10)
1. device that is used to carry out residual current protecting comprises:
One residual current detector (110) is used for the residual current of circuit is sampled, and obtains residual current sampled signal (S
r);
One control circuit (120) is used at residual current sampled signal (S
r) send a triggering signal (S during greater than first preset value
T);
One actuator (130) is in response to said triggering signal (S
T) carry out and move;
Wherein, said control circuit (120) comprising:
One amplification module (121), this amplification module is to residual current sampled signal (S
r) amplify, and the first signal (S after the output amplification
1);
One trigger module (123) is used for exporting said triggering signal (S during greater than said first preset value at its input signal
T);
One inverse time-lag module (125) is used for the said first signal (S
1) carry out the inverse time lag delay, and export the secondary signal (S after delaying time from its output
2) to the input of said trigger module (123);
Wherein said controller (120) also comprises an additional delay module (40), and it is at residual current sampled signal (S
r) during greater than second preset value, to this second sampled signal (S
r) delay time, and export the 3rd signal (S at its output
3) to the input of said trigger module (123); Wherein said second preset value is corresponding to making said residual current detector (110) get into the sampled value of the residual current of saturation condition,
Wherein, in said residual current detector (110) when being in saturation condition, said the 3rd signal (S
3) reach said first preset value time less than said secondary signal (S
2) reach the said first preset value required time.
2. device as claimed in claim 1, wherein said additional delay module (40) comprise a start unit (410) and a charge/discharge unit (420);
Said start unit (410) is at said residual current sampled signal (S
r) start when reaching said second preset value and export a charging signals (S
C) to charge/discharge unit (420);
Said charge/discharge unit (420) by said charging signals (Sc) charging, and is exported said the 3rd signal (S
3).
3. device as claimed in claim 2, wherein said charge/discharge unit (420) are RC charge-discharge circuit (422).
4. device as claimed in claim 3; Wherein said RC charge-discharge circuit (422) comprises charging resistor (R16), discharge resistance (R17) and charging capacitor (C6), and its time of discharging and recharging is designed to be suitable for when continuing residual current to occur, just make that said the 3rd signal (S3) reaches said first preset value.
5. device as claimed in claim 1, wherein said start unit comprise a switch element, and the cut-in voltage of this switch element is corresponding to making said residual current detector (110) get into the sampled value of the residual current of saturation condition.
6. device as claimed in claim 5, wherein said switch element are a kind of inverting elements.
7. device as claimed in claim 6, wherein said switch element are a photoelectrical coupler (N2).
8. device as claimed in claim 1, the size of wherein said second preset value is corresponding to five times of specified residue leakage current.
9. device as claimed in claim 1, wherein said amplification module (121) and said trigger module (123) are integrated on the earth leakage protective control chip IC M54123.
10. has circuit breaker like arbitrary described Aftercurrent protecting equipment among the claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110143762.3A CN102810841B (en) | 2011-05-30 | 2011-05-30 | Residual current protective device and circuit breaker |
Applications Claiming Priority (1)
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| CN201110143762.3A CN102810841B (en) | 2011-05-30 | 2011-05-30 | Residual current protective device and circuit breaker |
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| CN102810841A true CN102810841A (en) | 2012-12-05 |
| CN102810841B CN102810841B (en) | 2015-02-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106033879A (en) * | 2015-03-09 | 2016-10-19 | 西门子公司 | Circuit breaking protection circuit |
| CN106356803A (en) * | 2016-09-27 | 2017-01-25 | 福建通力达实业有限公司 | Control circuit of circuit breaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4685024A (en) * | 1985-11-19 | 1987-08-04 | General Electric Company | Overcurrent circuit interrupter using RMS sampling |
| US20090027814A1 (en) * | 2006-03-14 | 2009-01-29 | Moeller Gmbh | Electronic tripping unit for a motor-circuit breaker of an electric motor |
| US20100052691A1 (en) * | 2006-04-26 | 2010-03-04 | See Ni Fong | Time Alert Device for Use Together with an Earth Leakage Protection Device |
| CN101741049A (en) * | 2008-11-20 | 2010-06-16 | 西门子公司 | Control device and control method for residual current circuit breakers |
-
2011
- 2011-05-30 CN CN201110143762.3A patent/CN102810841B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4685024A (en) * | 1985-11-19 | 1987-08-04 | General Electric Company | Overcurrent circuit interrupter using RMS sampling |
| US20090027814A1 (en) * | 2006-03-14 | 2009-01-29 | Moeller Gmbh | Electronic tripping unit for a motor-circuit breaker of an electric motor |
| US20100052691A1 (en) * | 2006-04-26 | 2010-03-04 | See Ni Fong | Time Alert Device for Use Together with an Earth Leakage Protection Device |
| CN101741049A (en) * | 2008-11-20 | 2010-06-16 | 西门子公司 | Control device and control method for residual current circuit breakers |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106033879A (en) * | 2015-03-09 | 2016-10-19 | 西门子公司 | Circuit breaking protection circuit |
| CN106033879B (en) * | 2015-03-09 | 2018-10-16 | 西门子公司 | Breaking protection circuit |
| CN106356803A (en) * | 2016-09-27 | 2017-01-25 | 福建通力达实业有限公司 | Control circuit of circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102810841B (en) | 2015-02-04 |
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