CN101888082B - Residual current protector - Google Patents
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- CN101888082B CN101888082B CN 201010222937 CN201010222937A CN101888082B CN 101888082 B CN101888082 B CN 101888082B CN 201010222937 CN201010222937 CN 201010222937 CN 201010222937 A CN201010222937 A CN 201010222937A CN 101888082 B CN101888082 B CN 101888082B
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Abstract
The invention relates to a residual current protector, comprising a zero-sequence transformer, a detection coil, a signal regulation circuit, a logical processing module, a releaser, a test coil and a direct current power supply device. The residual current protector adopts a measurement switch, a simulation current generator, a trip sensitivity setting device and a parameter regulation resistor RS to form a device with optimized performances. A three-jointed RC phase-shifted oscillation circuit is used in the simulation current generator; and the measurement switch controls on-off of a low voltage direct current power supply provided to the RC phase-shifted oscillation circuit, and when the low voltage direct current power supply is switched on, the RC phase-shifted oscillation circuit outputs an excited signal with an alternative current sine wave form to the test coil. The power supply mode of the simulation current generator powered by the low voltage direct current power supply is optimized, and the trip sensitivity of the residual current protector under the test condition is not relevant to the set parameters of the trip sensitivity setting device and is higher than the trip sensitivity of the residual current protector under the normal condition, thereby greatly simplifying the structure of the circuit, reducing the volume of the product and improving the safe reliability and durability of the product.
Description
Technical field
The present invention relates to have the electronic type residual current operated protective device of simulation residual current test circuit, specifically, relate to for the electric current action type residual current circuit breaker of judging whether its aftercurrent action protecting function can work.
Background technology
Residual current operated protective device is a kind of low-voltage electrical apparatus commonly used in the electric power system, and residual current operated protective device is the abbreviation of RCD, former steelyard slepsydra non-electricity protector.Residual current operated protective device comprises breaker body, residual current detection device, electronic logic processing module, tester for testing and power circuit.Breaker body comprises operating mechanism, contact system and release, is used for carrying out being switched on or switched off of main circuit.Residual current detection device is for detection of residual current or earth fault current.The electronic logic processing module for the treatment of with the signal of judging from residual current detection device, when residual current or earth fault current reach a preset limit value, electronic logic processing module control is threaded off release, and the contact system by breaker body disconnects controlled circuit.Tester for testing is used for checking termly the performance of residual current operated protective device and judging whether the residual current protecting function of circuit breaker can work; a residual current by the simulation existence; this simulation residual current can be detected device and detect, and can report to the police and cause electronic logic processing module control release to thread off.
Current; the simulation residual current of the test loop of the testing apparatus of commercially available low pressure residual current operated protective device is directly from main circuit; the most frequently used scheme has two kinds: a kind of is that power-type resistance, test coil and testing button are serially connected between A, the B of main circuit, any two-phase in the C three-phase; press testing button by manpower and connect circuit; there is a residual current in simulation, drives circuit breaker by the residual current detection device output signal and disconnects.Another kind of such as the disclosed scheme of patent application CN1976158A, it is the input that power resistor, test coil and button-type switch series is connected on rectification side power circuit, then press the button type switch connection circuit by manpower, thereby formed a current path, made the simulation residual current pass through residual current detection device.Adopt the disadvantage of above two schemes: the power-type resistance of test loop needs excessive size and heat dissipation, so not only affect the requirement of product Miniaturization Design, and more seriously, because test loop is installed between any two-phase of power circuit, therefore can bring reliability and the durability issues of test loop.If residual current operated protective device carries out the installation of lower wiring patter electric power in addition; when testing by the residual current test loop; breaker body is carried in the power supply at test loop two ends less than disconnecting when disconnecting; if pin the overlong time of button, also may cause the danger of test resistance thermal breakdown.
Patent application CN101207271A discloses a kind of residual current operated protective device; its testing apparatus adopts single-chip microcomputer (controlled programmable device) to realize; from the I/O port simulation output high-frequency PWM pulse wave signal of programming chip, will there be a residual current excited signal in the output signal of this pwm pulse ripple by the simulation of test winding coil.This protector implements the circuit complexity, and the single-chip microcomputer cost is higher.In addition, the sine wave freuqency that LC oscillating circuit commonly used produces is higher, if will produce the lower pure oscillation of frequency as the residual current signal, certainly will require oscillation circuit that larger inductance and electric capacity will be arranged, so not only component size large, heavy, inconvenience is installed, and make difficulty, cost is high.
Moreover, can satisfy the requirement of various trip sensitivities in order to make the residual current operated protective device product, people generally adopt the trip sensitivity setting apparatus, by this setting apparatus, are using the on-the-spot trip sensitivity of setting breaker body with regard to adjustable.Yet because under test mode; the trip sensitivity of existing residual current operated protective device is relevant with the setup parameter of its trip sensitivity setting apparatus; so when test operation, need set first the parameter of trip sensitivity setting apparatus; then test; if do not set first and may cause test crash; again the parameter of trip sensitivity setting apparatus is recalled to after can only to be testedly finishing, thereby use operation to bring great inconvenience to the scene.
Summary of the invention
The object of the invention is to overcome above-mentioned many defectives of prior art, a kind of integrate measuring ability, test function and sensitivity set-up function and more optimal residual current operated protective device of performance is provided.
For achieving the above object; a kind of residual current operated protective device of the present invention comprises: residual current detection device 10; comprise toroidal core and a plurality of secondary coil winding around the primary coil winding; each the secondary coil winding that comprises test coil 4 and magnetic test coil 2 is direct on the toroidal core of residual current detection device 10 respectively, generates a detection signal by the residual current of magnetic test coil 2 detections or the electric signal of earth fault current through signal adjustment circuit 40.Logic processing module 6, according to producing the electric control signal of a driving release 5 actions from the detection signal of signal adjustment circuit 40, release 5 drives breaker body 1 and realizes the power circuit disjunction.Continuous-current plant 11 comprises current limliting module 8, rectification module 9 and low-voltage direct output module 3.Simulation residual current generator 70 comprises current-limiting resistance R7, capacitance C5 and three joint RC phase shift oscillating circuits 71, one end of the test coil 4 of oscillating current Ausgang and capacitance C5, current-limiting resistance R7, residual current detection device 10 is connected in series, the other end of test coil 4 is connected with earth terminal g, forms test loop between oscillating current Ausgang and earth terminal g.A testing button 41 is connected between the VCC input and low-voltage direct output module 3 of three joint RC phase shift oscillating circuits 71, the break-make of the low-voltage dc power supply that control is provided to three joint RC phase shift oscillating circuits 71 of simulation residual current generator 70 by low-voltage direct output module 3, when three joint RC phase shift oscillating circuits 71 were connected with low-voltage direct output module 3, described three joint RC phase shift oscillating circuits 71 were the excited signal of AC sine wave to test coil 4 output waveforms.
Described three joint RC phase shift oscillating circuits 71 comprise inverting amplifier and phase shift feedback network, inverting amplifier is optional one from triode VT, operational amplifier or field effect transistor, three grades of RC advanced versions that the phase shift feedback network is comprised of three resonant capacitance C1, C2 and C3, three resonant resistance R3, R4 and R5 or retarded type phase shift feedback, positive feedback directly takes back the inverting input of amplifier from the output of amplifier by the phase shift feedback network.The parameter that consists of three resonant resistance R3, R4 of described phase shift feedback network and R5, three resonant capacitance C1, C2 and C3 in the described three joint RC phase shift oscillating circuits 71 is R3=R4=R5, C1=C2=C3.Described three joint RC phase shift oscillating circuits 71 are a kind of in shunt resistance type RC phase shift oscillating circuit 710, the shunt capacitance formula RC phase shift oscillating circuit 711 exclusive disjunction amplifier RC phase shift oscillating circuits 712.
For achieving the above object; another kind of residual current operated protective device of the present invention comprises: residual current detection device 10; comprise toroidal core and a plurality of secondary coil winding around the primary coil winding; comprise each secondary coil winding of test coil 4 and magnetic test coil 2 respectively directly on the toroidal core of residual current detection device 10; for detection of the electric signal of residual current or earth fault current and generate a detection signal; logic processing module 6; according to the electric control signal that produces 5 actions of a driving release from the detection signal of residual current detection device 10; release 5 drives breaker body 1 and realizes the power circuit disjunction, and continuous-current plant 11 comprises current limliting module 8; rectification module 9 and low-voltage direct output module 3.
A performance optimization device 7 comprises Test Switchboard 73, simulation residual current generator 70, trip sensitivity setting apparatus 72 and parameter regulating resistance RS, and described parameter regulating resistance RS is connected in the two ends of magnetic test coil 2 in parallel.Test Switchboard 73 is the two-way control switch, the on/off between one tunnel control node a and the node b wherein, and the on/off between node c and the node d is controlled on another road; Under normal condition, node a and node b connect, and node c and node d disconnect; Under test mode, node a and node b disconnect, and node c and node d connect.Simulation residual current generator 70 comprises three joint RC phase shift oscillating circuits 71, current-limiting resistance R7 and capacitance C5, one end of the oscillating current Ausgang of described RC phase shift oscillating circuit 71 and capacitance C5, current-limiting resistance R7, test coil 4 is connected in series, the other end of test coil 4 is connected with earth terminal g, forms test loop between oscillating current Ausgang and earth terminal g.The selecting side h of trip sensitivity setting apparatus 72 is connected with the node b of Test Switchboard 73, and meet end j and be connected also ground connection with an end of magnetic test coil 2, the other end of magnetic test coil 2 is connected with the node a of Test Switchboard 73, and the signal input part of logic processing module 6 is connected with the node a of Test Switchboard 73.The Vcc input e of described RC phase shift oscillating circuit 71 is connected with the node d of Test Switchboard 73, the output of low-voltage direct output module 3 is connected with the node c of Test Switchboard 73, the break-make of the low-voltage dc power supply that Test Switchboard 73 control is provided to three joint RC phase shift oscillating circuits 71 of simulation residual current generator 70 by low-voltage direct output module 3, when three joint RC phase shift oscillating circuits 71 were connected with low-voltage direct output module 3, described three joint RC phase shift oscillating circuits 71 were the excited signal of AC sine wave to test coil 4 output waveforms.
The Induction Peried of described three joint RC phase shift oscillating circuits 71 is to realize adjusting by the matching value of the low-voltage dc power supply of regulating resonant resistance R3, R4, R5 and resonance capacitor C 1, C2, C3 and Vcc input e.
The step switch that described trip sensitivity setting apparatus 72 is connected in parallel and is formed by four different resistance R T of resistance value, the end of described four resistance R T is connected in parallel and forms and connect end j, the other end of four resistance R T disconnects mutually, the RT open end that should mutually disconnect can select one of them resistance R T and parameter regulating resistance RS to be connected in parallel for the selecting side h of trip sensitivity setting apparatus 72 selectively, and described parameter regulating resistance RS and resistance R T realize the adjusting of the action sensitivity of residual current circuit breaker jointly.Described two-way switch 73 consists of the engaging structure with continuous-current plant 11 and resistance R T reciprocal interlocking; can not connect with continuous-current plant 11 and resistance R T simultaneously, the trip sensitivity of the residual current operated protective device under test mode and the setup parameter of described trip sensitivity setting apparatus 72 are had nothing to do.
The span of parameter regulating resistance RS is 2K～3.9K, and the span of resistance R T is 7.6 ohm～619 ohm, makes the trip sensitivity of the residual current operated protective device under test mode be higher than the trip sensitivity of the residual current operated protective device under normal condition.
Described three joint RC phase shift oscillating circuits 71 are a kind of in shunt resistance type RC phase shift oscillating circuit 710, the shunt capacitance formula RC phase shift oscillating circuit 711 exclusive disjunction amplifier RC phase shift oscillating circuits 712.
Residual current operated protective device device of the present invention; the simulation residual current is from the analog current generator in the performance optimization device; and the analog current generator is by the low-voltage direct output power supply of continuous-current plant; the set point of measurement sensitivity and sensitivity setting apparatus is irrelevant in the test process; thereby need not to adopt expensive electronic devices and components, greatly dwindled small product size, reduced the weight of product; simplify the structure of circuit, improved security reliability and the useful life of product.Compare with existing apparatus, the present invention has following outstanding advantages:
1, tester for testing miniaturization, component number is few and cost is low.
2, tester for testing is realized anti-interference, faulty action preventing function by the Induction Peried of control oscillating circuit.
3, by test loop and the decoupling zero that detects the loop, can realize test function with less measuring current.
Description of drawings
Fig. 1 schematically illustrates the testing apparatus according to the residual current operated protective device of first embodiment of the invention.
Fig. 2 is the circuit diagram according to simulation residual current generator the first embodiment of the present invention, and the joint of three among figure RC phase shift oscillating circuit is shunt resistance type RC phase shift oscillating circuit.
Fig. 3 is the circuit diagram according to simulation residual current generator the second embodiment of the present invention, and the joint of three among figure RC phase shift oscillating circuit is shunt capacitance formula RC phase shift oscillating circuit.
Fig. 4 is the circuit diagram according to simulation residual current generator the 3rd embodiment of the present invention, and the joint of three among figure RC phase shift oscillating circuit is operational amplifier RC phase shift oscillating circuit.
Fig. 5 schematically illustrates the testing apparatus according to the residual current operated protective device of second embodiment of the invention.
Fig. 6 is the circuit diagram according to the performance optimization device of the residual current operated protective device of second embodiment of the invention, and the joint of three among figure RC phase shift oscillating circuit is shunt resistance type RC phase shift oscillating circuit.
Fig. 7 is the circuit working principle schematic according to the residual current operated protective device of second embodiment of the invention, and the circuit among the figure is in " test " state that manpower is pressed.
Fig. 8 is the circuit working principle schematic according to the residual current operated protective device of second embodiment of the invention, and the circuit among the figure is in " normally " state that does not have manpower to press.
Fig. 9 is the output waveform figure that RC phase shift oscillating circuit simulation of the present invention produces, and the simulation residual current shown in the figure is sinusoidal ac.
Embodiment
According to following to only provide as non-limitative example and by reference to the accompanying drawings shown in the description of specific embodiments of the invention, characteristic of the present invention and advantage will become more clear and be easier to understand.
It is the overall structure schematic diagram according to the residual current operated protective device of the present invention the first and second embodiment realization among Fig. 1,5.Breaker body 1 among Fig. 1,5 is used for connection or disjunction power circuit A, B, C.Residual current detection device 10 is a zero sequence current mutual inductor in the present embodiment, can be used for detecting residual current or earth fault current.Residual current detection device 10 as shown in Figure 1 comprises toroidal core, primary coil winding and a plurality of secondary coil winding, the primary coil winding is comprised of two-phase or multiphase current conductor, they by toroidal core institute around, the three-phase power line A of main circuit, B, C pass the toroidal core of zero-sequence transformer 10 among Fig. 1.Described secondary coil winding comprises magnetic test coil 2 and test coil 4, and each secondary coil winding directly is wound on respectively on the toroidal core skeleton of zero-sequence transformer 10.Continuous-current plant 11 comprises current limliting module 8, rectification module 9 and low-voltage direct output module 3.
The signal input part of the signal adjustment circuit 40 in the residual current operated protective device of the first embodiment of Fig. 1 and magnetic test coil 2 are connected in series to form and detect the loop; when magnetic test coil 2 is sensed the residual current signal; signal adjustment circuit 40 receives the detection signal that comes from magnetic test coil 2; and this detection signal is carried out signal process; the signal output part of signal adjustment circuit 40 is connected with logic processing module 6; judge rear output electric control signal by logic processing module 6; drive electromagnetic release 5 actions, electromagnetic release 5 promotes the mechanical mechanism action disjunction power circuit of breaker body 1.As shown in Figure 1, output and the test coil 4 of simulation residual current generator 70 are connected in series the formation test loop, and the power input of residual current generator 70 after tested button 41 is connected in series with low-voltage direct output module 3.When the people surveys button 41 for pressing, low-voltage direct output module 3 provides the low-voltage DC voltage-stabilizing power supply to simulation residual current generator 70, simulation residual current generator 70 is produced and the output simple sinusoidal alternating current, be used for simulation and have a residual current, this electric current is exactly the simulation residual current that flows through from test coil 4.Magnetic test coil 2 is sent to signal adjustment circuit 40 after sensing this simulation residual current signal equally, judges and drives release 5 through logic processing module 6 and move.
The low-voltage DC source apparatus 11 of the simulation residual current generator 70 of residual current operated protective device of the present invention is obtained after processing through step-down, rectification, voltage stabilizing by high-voltage power voltage; low-voltage DC source apparatus 11 produces simulation exciting curent signal by RC phase shift oscillating circuit; and this excited signal is sinusoidal ac signal, can be used for the simulation excited signal of all types of Aftercurrent protection circuit breakers.The present invention adopts RC phase shift oscillating circuit to realize the test experiments function of Aftercurrent protection circuit breaker; because simulation residual current generator 70 adopts low-voltage DC supply; need not realize excited signal by the high voltage source simulation; but become form of communication to form excited signal by winding coil the low-voltage DC voltage-stabilizing voltage transitions by RC phase shift oscillating circuit; so not only volume is little; and the caloric value of electronic component is little, thereby has overcome durability and the poor problem of security reliability of the protector that the power resistor of prior art causes.
Shown in Fig. 2-4 is three execution modes of the simulation residual current generator 70 of residual current operated protective device of the present invention.Shown in the circuit diagram of Fig. 2 the first embodiment, simulation residual current generator 70 comprises current-limiting resistance R7, capacitance C5 and the three joint RC phase shift oscillating circuits 71 that add in the common radiating circuit of triode VT.In Fig. 2 and 3, capacitor C 5 mainly plays every straight effect, and it works to adjust impedance with resistance R 7, is used for adjusting the size of test coil 4 electric currents.Described three joint RC phase shift oscillating circuits 71 have Vcc input e, oscillating current Ausgang, earth terminal g.Vcc input e is the low-voltage dc power supply input, and button 41 and low-voltage direct output module 3 are connected in series after tested for it.The oscillating current Ausgang is used for the output oscillating current, and it and capacitance C5, current-limiting resistance 7, test coil 4, earth terminal g are connected in series the formation test loop.When the people connects it for pressing testing button 41; described residual current operated protective device enters test mode; low-voltage direct output module 3 provides low-voltage DC to simulation residual current generator 70 at this moment; simulation residual current generator 70 is to test coil 4 output simulation residual currents, and this simulation residual current is sinusoidal ac.When pressing testing button 41, above-mentioned test loop is disconnected at this moment unmanned, no current in the test coil 4, and described residual current operated protective device enters normal condition.
As shown in Figure 2, three of residual current operated protective device of the present invention joint RC phase shift oscillating circuits 71 are comprised of inverting amplifier and phase shift feedback network.In embodiment illustrated in fig. 2, inverting amplifier is a triode VT, also adopts in other embodiments operational amplifier or field effect transistor etc. to replace triode VT to realize enlarging function.Three grades of RC advanced version phase shift feedbacks that the phase shift feedback network is comprised of the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th resistance R 4, the 5th resistance R 5 and the 6th resistance R 6, wherein the first capacitor C 1, the second capacitor C 2 and the 3rd capacitor C 3 are connected with feedback loop, be that above-mentioned three capacitances in series are between the base stage and collector electrode of triode VT, three resistance R 1, R2, R6 are biasing resistor, be used for driving and limiting the electric current of collector electrode, base stage and the emitter of triode VT, R1 wherein, R2 consist of the base drive biasing of triode.Three resistance R 3, R4, R5 are resonant resistance, and R3, R4, R5 are greater than three times of R6, to satisfy the requirement that consists of amplifying circuit.Three capacitor C 1, C2, C3 are resonant capacitance, and three resonant resistance R3, R4, R5 and three resonant capacitance C1, C2, C3 form three joint resonant circuits.Low-voltage direct output module 3 is DC power supply of described RC phase shift oscillating circuit 71, the element of determining oscillator frequency is the phase-shift network that R1, R4, R5 and C1, C2, C3 form, positive feedback directly takes back the inverting input of amplifier from the output of amplifier by the phase shift feedback network.Because the inverting function of amplifier, 180 ° phase shift is provided, in order to satisfy the phase equilibrium of vibration, phase-shift network provides 180 ° phase shift again, the maximum phase shift that every grade of RC circuit can provide is 90 °, but this moment R or C be necessary for zero, so phase-shift circuit will adopt three grades of compositions at least, 60 ° of every grade of phase shifts, the RC phase-shift circuits that namely added three joint series connection in common radiating circuit form feedback network.In the leading time network, electric capacity is connected with feedback loop, so just can be so that the feedback signal that produces around whole resistance is ahead of amplifier signal; In retarded type, feedback loop series connection be resistance, and these resistance are in parallel with electric capacity, thereby can produce the feedback signal of hysteresis.Fig. 2 is the embodiment that has used advanced version RC oscillating circuit, and Fig. 3 is the embodiment that has used retarded type RC oscillating circuit.
By adjusting the matching value of RC (resonant resistance R3, R4, R5 and resonance capacitor C 1, C2, C3) and Vcc, can reach the purpose of the Induction Peried of regulating three joint RC phase shift oscillating circuits 71, thereby improve the ability of the anti-interference and false action-proof of protector.In order to satisfy the phase shift requirement, the parameter that need establish resonant resistance equates, i.e. R3=R4=R5, and the parameter of establishing resonant capacitance equates, i.e. C1=C2=C3.As seen from Figure 2, connect by parallel way between three resonant resistance R3, R4, the R5, and connect in series between three resonant capacitance C1, C2, the C3, three joint RC phase shift oscillating circuits with this connection features are referred to as shunt resistance type RC phase shift oscillating circuit 710 here.
As shown in Figure 3, three of residual current operated protective device of the present invention joint RC phase shift oscillating circuits 71 adopt shunt capacitance formula RC phase shift oscillating circuit 711 to realize.Compare with shunt resistance type RC phase shift oscillating circuit 710 shown in Figure 2, except the connected mode of three resonant resistance R3, R4, R5 and three resonant capacitance C1, C2, C3 was different, the remaining circuit structure of shunt capacitance formula RC phase shift oscillating circuit 711 shown in Figure 3 was all identical.The difference of above-mentioned connected mode is: the mode by parallel connection between three resonant capacitance C1, C2 of shunt capacitance formula RC phase shift oscillating circuit 711, the C3 connects, and the mode by series connection connects between three resonant resistance R3, R4, the R5.
As shown in Figure 4, the another kind of alternative scheme of three joint RC phase shift oscillating circuits 71 of residual current operated protective device of the present invention is to adopt operational amplifier RC phase shift oscillating circuit 712, replaces triode to realize enlarging function with operational amplifier.This operational amplifier RC phase shift oscillating circuit 712 is made of operational amplifier 700, resistance R F, resistance R 1, three resonant resistance R3, R4 and R5, three resonant capacitance C1, C2 and C3.Substituted by Fig. 2 or three triode VT, resistance R 1, R2, R6 and the capacitor C 4 that save in the RC phase shift oscillating circuits shown in Figure 3 by operational amplifier 700, resistance R 1 and resistance R F.As shown in Figure 4, connect by parallel way between three resonant resistance R3, R4, the R5, and connect in series between three resonant capacitance C1, C2, the C3, so it is to belong to shunt resistance type operational amplifier RC phase shift oscillating circuit.If the connection of the resonant resistance electric capacity of Fig. 4 is made into to connect by parallel way between three resonant capacitance C1, C2, the C3, connect in series between three resonant resistance R3, R4, the R5, so just formed shunt capacitance formula operational amplifier RC phase shift oscillating circuit.Thus, operational amplifier RC phase shift oscillating circuit of the present invention both can refer to shunt resistance type operational amplifier RC phase shift oscillating circuit, maybe can refer to shunt capacitance formula operational amplifier RC phase shift oscillating circuit.Should be noted that than Fig. 2 and triode RC phase shift oscillating circuit cost height shown in Figure 3, therefore, the present invention preferably adopts triode RC phase shift oscillating circuit owing to directly replace with the operational amplifier RC phase shift oscillating circuit of integrated transporting discharging.
Fig. 5 is the overall structure block diagram of the second embodiment of residual current operated protective device of the present invention.Compare with residual current operated protective device of the present invention shown in Figure 1; in the embodiment shown in fig. 5; except comprise breaker body 1, zero-sequence transformer 10, respectively the magnetic test coil on zero-sequence transformer 10 2 and test coil 4, release 5, logic processing module 6, the continuous-current plant 11; also comprise a performance optimization device 7; it has solved to adopt further improves behind the simulation residual current generator and the problem of optimizing product performance; so that design and the assembling and setting of simulation residual current generator are more prone to, the protector product uses more convenient operation.
As Fig. 6 to performance optimization device 7 shown in Figure 8 comprise the two-way of the Test Switchboard 73 of magnetic test coil 2, simulation residual current generator 70, trip sensitivity setting apparatus 72, parameter regulating resistance RS and testing button 41 often run with normally closed in one distance normally-closed contact.Described Test Switchboard 73 is the two-way control switch, which is provided with four switching node a, b, c, d, wherein is switched on or switched off between one tunnel control node a and the node b, is switched on or switched off between another road control node c and the node d.Under normal condition, namely not under test mode, node a and node b connect, and node c and node d disconnect.Under test mode, node a and node b disconnect, and node c and node d connect.The normal condition of protector and the conversion between the test mode are controlled artificially.When the people when pressing Test Switchboard 73, protector is converted to test mode by normal condition; When the people is the control that removes Test Switchboard 73, namely Test Switchboard is under the nature, and protector automatically restores to normal condition.Identical with the first embodiment, simulation residual current generator 70 comprises three joint RC phase shift oscillating circuits 71, current-limiting resistance R7 and capacitance C5.Identical with the first embodiment, RC phase shift oscillating circuit 71 has three electric connecting terminals, i.e. Vcc input e, oscillating current Ausgang, earth terminal g.Described Vcc input e is connected with the node d of Test Switchboard 73, and an end of oscillating current Ausgang and capacitance C5, current-limiting resistance R7, test coil 4 is connected in series, the other end ground connection of test coil 4.Trip sensitivity setting apparatus 72 is connected in parallel by four different resistance R T of resistance value and forms, the end of four resistance R T is connected in parallel and forms and connect end j, and meet end j and be connected also ground connection with an end of magnetic test coil 2, the other end of magnetic test coil 2 is connected with the node a of Test Switchboard 73.The other end of four resistance R T disconnects mutually, the open end that should mutually disconnect can be connected with one of them selectively for the selecting side h of trip sensitivity setting apparatus 72, it is the requirement that can select different trip sensitivities in order to satisfy that this stepping is selected, and finishes the stepping operation of setting trip sensitivity by the operating personnel people at scene.The selecting side h of trip sensitivity setting apparatus 72 is connected with the node b of Test Switchboard 73, the two ends of parameter regulating resistance RS are connected in the two ends of magnetic test coil 2 in parallel, the signal input part of logic processing module 6 is connected with the node a of Test Switchboard 73, and the output of low-voltage direct output module 3 is connected with the node c of Test Switchboard 73.
Further specify the operation principle of the second embodiment of the present invention below in conjunction with Fig. 5 to 8.Testing button 41 adopts two-way switch 73, and the structure of the two-way switch 73 of button consists of the relation of reciprocal interlocking.Here interlock connection refers to or is and the low-voltage DC voltage-stabilizing power connection, or is to connect with resistance R T, and two-way is not all connected simultaneously.Resistance R T is that the sensitivity stepping is used, the present invention selects resistance and parameter regulating resistance RS among the sensitivity resistor RT in parallel by step switch 72, parameter regulating resistance RS and resistance R T all belong to performance optimization device 7, and they are used for realizing the adjusting of the action sensitivity of residual current circuit breaker jointly.The span of sensitivity resistor RS is 2K～3.9K, and the span of 4 Adjustment of sensitivity resistance R T is 7.6 ohm～619 ohm.Under normal condition, the node a of Test Switchboard 73 and node b connect, and node c and node d disconnect.The connection of node a and node b; so that the resistance R T of trip sensitivity setting apparatus 72 is in parallel with parameter regulating resistance RS; and be attempted by the two ends of magnetic test coil 2; so the tripping operation action sensitivity of residual current operated protective device depend on parameter regulating resistance RS and resistance R T the two, this is easily to regulate to realize in design.When manual operation selected the resistance value of RT to be manual operation setting trip sensitivity, the trip sensitivity of residual current operated protective device can change.When the residual current fault appears in three-phase power line A, B, the C of main circuit, magnetic test coil 2 can be sensed the residual current signal, this residual current signal is input to logic processing module 6,6 pairs of these residual current signals of logic processing module are processed, when this residual current signal surpassed certain thresholding, logic processing module 6 control releases 5 sent the action of threading off; Under this state, node c and node d disconnect, and simulation residual current generator 70 is not worked, and namely test coil 4 interior no currents flow through.Sensitivity and the real surplus electric current action sensitivity of testing apparatus simulation residual current acting of the present invention are mutual decoupling zeros.Here said decoupling zero refers to that the sensitivity resistor ratio in testing button loop is easier to type selecting, and has nothing to do with sensitivity resistor RT.Specifically, under test mode, when shift knob is pressed, low-voltage dc power supply and RC phase shift oscillating circuit are connected, and the node a of Test Switchboard 73 and node b disconnect, and node c and node d connection.The disconnection of node a and node b; so that trip sensitivity setting apparatus 72 does not participate in work; so the trip sensitivity of residual current operated protective device only depends on parameter regulating resistance RS; resistance neither one in the RT resistor network can access the secondary side of magnetic test coil winding; that is to say; when pressing the test loop shift knob; then sensitivity resistor RT breaks from the loop; be serially connected in and just only have sensitivity resistor Rs in the magnetic test coil 2; also can say under this state; the sensitivity resistor of testing button loop action is remaining parameter regulating resistance RS only just; the sensitivity in testing button loop and sensitivity resistor RT directly do not concern; what parameter regulating resistance RS selected is larger just sensitiveer, and RC phase shift oscillating circuit is exported less just energy so that circuit breaker moves.Because the trip sensitivity of residual current operated protective device and trip sensitivity setting apparatus 72 are irrelevant, so realized its decoupling zero.This moment, node c and node d connected, so that simulation residual current generator 70 produces the simulation residual current, this simulation residual current flows through test coil 4, make magnetic test coil 2 sense the residual current signal, this residual current signal is input to logic processing module 6, the action of threading off occurs in logic processing module 6 control releases 5, makes breaker body 1 tripping operation and disconnects main circuit.Be not difficult to find out from above explanation about operation principle; the remarkable contribution of the performance optimization device 7 of residual current operated protective device of the present invention is: in test mode; trip sensitivity setting apparatus 72 is not worked; the cache oblivious that the trip sensitivity of residual current operated protective device and trip sensitivity setting apparatus 72 set; this not only greatly facilitates on-the-spot test operation; but also greatly facilitate circuit design and debugging, thereby greatly reduce manufacture difficulty and the production cost of product.Because the resistance R T of trip sensitivity setting apparatus 72 and parameter regulating resistance RS adopt and are connected in parallel; so the trip sensitivity under test mode is higher than the measurement sensitivity under the normal condition; namely the tripping operation response speed under the test mode is faster than the tripping operation response speed under the normal condition; thereby having avoided pressing for a long time electronic devices and components that Test Switchboard 73 causes crosses the situation of cause thermal damage and occurs; the grade of the safety test that has improved has been improved the safety and reliability of protector greatly.
Three joint RC phase shift oscillating circuits 71 shown in Figure 6 are identical with three joint RC phase shift oscillating circuits 71 among first embodiment shown in Figure 2, all are that shunt resistance type three saves RC phase shift oscillating circuits 710.The same with the first embodiment, the another kind of scheme of the shunt resistance type RC phase shift oscillating circuit 710 of alternative the second embodiment is shunt capacitance formula RC phase shift oscillating circuits 711 as shown in Figure 3, or operational amplifier RC phase shift oscillating circuit 712 as shown in Figure 4.Be that the joint of three shown in Fig. 2-4 RC phase shift oscillating circuit 71 is applicable to the residual current operated protective device of the present invention of Fig. 1 and Fig. 5.
Fig. 9 is the oscillogram of the simulation residual current exported of simulation residual current generator 70 of the present invention, is the simple alternating current excited signal by simulation residual current shown in Figure 9, can be used for the excited signal simulation test of all types of Aftercurrent protection circuit breakers.Wherein, T represents the cycle time of the sine wave of the stable output of oscillating circuit, and TD represents Induction Peried, and the time of starting of oscillation is stablized in the TL representative.Cause the disjunction of circuit breaker mistake in order to reduce the people for misoperation, need to require according to the actual functional capability of circuit breaker the circuit Induction Peried TD of RC phase shift oscillating circuit is set respectively, can regulate by the RC parameter of resonant resistance R3, R4 shown in Figure 2, R5 and resonance capacitor C 1, C2, C3 and match.
More than be two embodiment of residual current operated protective device of the present invention; wherein the trip sensitivity setting apparatus 72 of the second embodiment has adopted parallel form; namely the end of four resistance R T is connected in parallel, and form the end j that is connected in parallel, and the other end cooperates selection to be connected as the beginning with selecting side h.Another kind of alternative equivalent electric circuit can be the series connection form, and namely four resistance R T are connected in series the formation series circuit, and an end of series circuit is link j, and the exit between the other end and two adjacent resistors is as the beginning, cooperates with selecting side h and selects to be connected.
In addition, capacitance C5 in the simulation residual current generator 70 of the first embodiment of the present invention or the second embodiment, can save in following two kinds of situations: the first situation is the requirement that reduces the AC characteristic of simulation residual current, namely allows to exist in the simulation residual current use occasion of larger direct current composition; The second situation is that the AC characteristic of oscillating current of three joint RC phase shift oscillating circuits, 71 outputs is fine, namely in straight situation, can not be used as the simulation residual current yet, but adopt C5 can make the AC characteristic of simulation residual current better, this situation is as occurring in the scheme of the three joint RC phase shift oscillating circuits that adopt the operation amplifier type.
Residual current hookup provided by the invention is realized the residual current that simulation exists with the low-voltage DC voltage-stabilizing power supply by RC phase shift oscillating circuit; Aftercurrent protection circuit breaker can carry out the up and down power line installation of inlet wire easily, and does not affect its security reliability.Not only solved the problem of test loop thermal design; and satisfy the requirement that inlet wire is installed under the residual current operated protective device; and can set RC oscillating circuit starting of oscillation delay time; satisfy simultaneously the testing experiment function of A type, AC type, Type B residual current operated protective device; it is simple to have circuit; cost is low, and reliability is high, advantage applied widely.RC phase shift oscillating circuit simulation excited signal, can also simply obtain needed action sensitivity requirement by the numerical values recited that changes RC, adopt simultaneously different RC numerical oscillation circuit that different Induction Perieds is arranged, can set needed circuit Induction Peried according to functional requirement, reduce the people and disconnect for misoperation causes driving circuit breaker.The present invention adopts RC phase shift oscillating circuit to realize the testing experiment circuit of residual current protecting; its stable output wave of oscillation signal is the AC sine wave signal; and amplitude output signal is stable, is applicable to the simulation excited signal of all kinds Aftercurrent protection circuit breaker test loop.
What should be understood that is, above-described embodiment is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the connotation scope of the present invention all fall within protection scope of the present invention.
Claims (9)
1. residual current operated protective device comprises:
Residual current detection device (10), comprise toroidal core and a plurality of secondary coil winding around the primary coil winding, comprise each secondary coil winding of test coil (4) and magnetic test coil (2) respectively directly on the toroidal core of residual current detection device (10), generate a detection signal by the residual current of magnetic test coil (2) detection or the electric signal of earth fault current through signal adjustment circuit (40)
Logic processing module (6), according to producing the electric control signal of a driving release (5) action from the detection signal of signal adjustment circuit (40), release (5) drives breaker body (1) and realizes the power circuit disjunction,
Continuous-current plant (11) comprises current limliting module (8), rectification module (9) and low-voltage direct output module (3),
It is characterized in that:
Simulation residual current generator (70) comprises current-limiting resistance R7, capacitance C5 and three joint RC phase shift oscillating circuits (71), one end of the test coil (4) of the oscillating current Ausgang of described three joint RC phase shift oscillating circuits and capacitance C5, current-limiting resistance R7, residual current detection device (10) is connected in series, the other end of test coil (4) is connected with earth terminal g, between oscillating current Ausgang and earth terminal g, form test loop
A testing button (41) is connected between the VCC input and low-voltage direct output module (3) of three joint RC phase shift oscillating circuits (71), control is by the break-make of low-voltage direct output module (3) to three low-voltage dc power supplies that provide of joint RC phase shift oscillating circuits (71) of simulation residual current generator (70), when three joint RC phase shift oscillating circuits (71) were connected with low-voltage direct output module (3), described three joint RC phase shift oscillating circuits (71) were the excited signal of AC sine wave to test coil 4 output waveforms;
Described three joint RC phase shift oscillating circuits (71) comprise inverting amplifier and phase shift feedback network, inverting amplifier is optional one from triode VT, operational amplifier or field effect transistor, three grades of RC advanced versions that the phase shift feedback network is comprised of three resonant capacitance C1, C2 and C3, three resonant resistance R3, R4 and R5 or retarded type phase shift feedback, positive feedback directly takes back the inverting input of amplifier from the output of amplifier by the phase shift feedback network.
2. residual current operated protective device according to claim 1 is characterized in that:
The parameter that consists of three resonant resistance R3, R4 of described phase shift feedback network and R5, three resonant capacitance C1, C2 and C3 in described three joints RC phase shift oscillating circuits (71) is R3=R4=R5, C1=C2=C3.
3. residual current operated protective device according to claim 1 is characterized in that: described three joint RC phase shift oscillating circuits (71) are a kind of in shunt resistance type RC phase shift oscillating circuit (710), shunt capacitance formula RC phase shift oscillating circuit (711) the exclusive disjunction amplifier RC phase shift oscillating circuit (712).
4. residual current operated protective device comprises:
Residual current detection device (10), comprise toroidal core and a plurality of secondary coil winding around the primary coil winding, comprise each secondary coil winding of test coil (4) and magnetic test coil (2) respectively directly on the toroidal core of residual current detection device (10), for detection of the electric signal of residual current or earth fault current and generate a detection signal
Logic processing module (6), according to producing the electric control signal of a driving release (5) action from the detection signal of residual current detection device (10), release (5) drives breaker body (1) and realizes the power circuit disjunction,
Continuous-current plant (11) comprises current limliting module (8), rectification module (9) and low-voltage direct output module (3),
It is characterized in that:
A performance optimization device (7) comprises Test Switchboard (73), simulation residual current generator (70), trip sensitivity setting apparatus (72) and parameter regulating resistance RS, and described parameter regulating resistance RS is connected in the two ends of magnetic test coil (2) in parallel,
Test Switchboard (73) is the two-way control switch, wherein one the tunnel controls on/off between node a and the node b, on/off between another road control node c and the node d; Under normal condition, node a and node b connect, and node c and node d disconnect; Under test mode, node a and node b disconnect, and node c and node d connect,
Simulation residual current generator (70) comprises three joint RC phase shift oscillating circuit (71), current-limiting resistance R7 and capacitance C5, one end of the oscillating current Ausgang of described RC phase shift oscillating circuit (71) and capacitance C5, current-limiting resistance R7, test coil (4) is connected in series, the other end of test coil (4) is connected with earth terminal g, between oscillating current Ausgang and earth terminal g, form test loop
The selecting side h of trip sensitivity setting apparatus (72) is connected with the node b of Test Switchboard (73), and meet end j and be connected also ground connection with an end of magnetic test coil (2), the other end of magnetic test coil (2) is connected with the node a of Test Switchboard (73), the signal input part of logic processing module (6) is connected with the node a of Test Switchboard (73)
The Vcc input e of described RC phase shift oscillating circuit (71) is connected with the node d of Test Switchboard (73), the output of low-voltage direct output module (3) is connected with the node c of Test Switchboard (73), the break-make of the low-voltage dc power supply that Test Switchboard (73) control is provided to three joint RC phase shift oscillating circuits (71) of simulation residual current generator (70) by low-voltage direct output module (3), when three joint RC phase shift oscillating circuits (71) were connected with low-voltage direct output module (3), described three joint RC phase shift oscillating circuits (71) were the excited signal of AC sine wave to test coil (4) output waveform;
Described three joint RC phase shift oscillating circuits (71) comprise inverting amplifier and phase shift feedback network, inverting amplifier is optional one from triode VT, operational amplifier or field effect transistor, three grades of RC advanced versions that the phase shift feedback network is comprised of three resonant capacitance C1, C2 and C3, three resonant resistance R3, R4 and R5 or retarded type phase shift feedback, positive feedback directly takes back the inverting input of amplifier from the output of amplifier by the phase shift feedback network.
5. residual current operated protective device according to claim 4 is characterized in that: the Induction Perieds of described three joint RC phase shift oscillating circuits (71) are to realize adjustment by the matching value of the low-voltage dc power supply of regulating resonant resistance R3, R4, R5 and resonance capacitor C 1, C2, C3 and Vcc input e.
6. residual current operated protective device according to claim 4; it is characterized in that: the step switch that described trip sensitivity setting apparatus (72) is connected in parallel and is formed by four different resistance R T of resistance value; the end of described four resistance R T is connected in parallel and forms and connect end j; the other end of four resistance R T disconnects mutually; the resistance R T open end that should mutually disconnect can select one of them resistance R T and parameter regulating resistance RS to be connected in parallel for the selecting side h of trip sensitivity setting apparatus (72) selectively, and described parameter regulating resistance RS and resistance R T realize the adjusting of the action sensitivity of residual current operated protective device jointly under normal condition.
7. residual current operated protective device according to claim 6; it is characterized in that: described Test Switchboard (73) consists of the engaging structure with continuous-current plant (11) and resistance R T reciprocal interlocking; can not connect with continuous-current plant (11) and resistance R T simultaneously, the trip sensitivity of the residual current operated protective device under test mode and the setup parameter of described trip sensitivity setting apparatus (72) are had nothing to do.
8. residual current operated protective device according to claim 6; it is characterized in that: the span of parameter regulating resistance RS is 2K～3.9K; the span of resistance R T is 7.6 ohm～619 ohm, makes the trip sensitivity of the residual current operated protective device under test mode be higher than the trip sensitivity of the residual current operated protective device under normal condition.
9. residual current operated protective device according to claim 4 is characterized in that: described three joint RC phase shift oscillating circuits (71) are a kind of in shunt resistance type RC phase shift oscillating circuit (710), shunt capacitance formula RC phase shift oscillating circuit (711) the exclusive disjunction amplifier RC phase shift oscillating circuit (712).
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| CN102035163A (en) * | 2010-12-10 | 2011-04-27 | 上海诺雅克电气有限公司 | Power supply device for residual current protector |
| FR2987515B1 (en) * | 2012-02-29 | 2015-01-23 | Valeo Sys Controle Moteur Sas | DEVICE FOR DETECTING A LEAKAGE CURRENT COMPRISING A CONTINUOUS COMPONENT, ONBOARD IN A VEHICLE, AND APPLICATIONS OF SAID DEVICE |
| US9304168B2 (en) * | 2012-10-29 | 2016-04-05 | General Electric Company | Methods and apparatus for testing an electronic trip device |
| CN103487750A (en) * | 2013-09-18 | 2014-01-01 | 德力西电气有限公司 | Testing circuit capable of detecting residual current operated circuit breaker in remote mode |
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| CN109755921A (en) * | 2017-11-08 | 2019-05-14 | 苏州益而益电器制造有限公司 | Ground-fault interrupter |
| CN107681630A (en) * | 2016-08-01 | 2018-02-09 | 施耐德电气工业公司 | Earth leakage circuit-breaker, related operating method and electric power system |
| CN106771532B (en) * | 2017-02-15 | 2023-08-22 | 许良炎 | Method and circuit for testing instantaneous current of leakage protector |
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| CN107404106B (en) * | 2017-07-07 | 2020-09-01 | 珠海格力电器股份有限公司 | Electric leakage simulation test circuit, electric leakage protector and electric leakage protection method |
| CN107204606A (en) * | 2017-07-27 | 2017-09-26 | 河北工业大学 | Without dead band earth leakage protecting method and device under a kind of random waveform |
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| CN111864691B (en) * | 2019-04-30 | 2023-04-28 | 上海复旦微电子集团股份有限公司 | Ground fault protection circuit |
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Application publication date: 20101117 Assignee: ZHEJIANG CHINT ELECTRICS Co.,Ltd. Assignor: SHANGHAI NOARK ELECTRIC Co.,Ltd. Contract record no.: X2021330000593 Denomination of invention: Residual current protector Granted publication date: 20130501 License type: Common License Record date: 20211025 |