CN2472384Y - Intellectual leakage breaker - Google Patents

Abstract

The utility model discloses an intelligent leakage circuit breaker, which comprises a base and a cover; wherein, the memory component comprises a switch contact, a release, a mechanical self locking and a breaking mechanism. The electric circuit unit comprises a leakage current protection circuit unit, a digital display phase current circuit unit. The utility model is characterized in that the electric circuit unit also comprises a phase lack and an overcurrent protection circuit unit; the utility model has the advantages of leakage current protection function, overcurrent protection and phase lack (phase failure) protection functions.

Description

Intelligent residual current circuit breaker

The utility model belongs to field of circuit breakers in the low-voltage electrical apparatus, refers in particular to a kind of intelligent residual current circuit breaker.

At present, protective device is based on fuse, air switch, thermal relay.Protection supply line when fuse is mainly used in short trouble reduces fault coverage and enlarges, but often because of the easier damage motor of open-phase running.The overcurrent element of air switch and thermal relay is to adopt bimetal leaf; be most widely used overload, overflow protecting element; but its function singleness; sensitivity is low, poor stability, and error is big; often malfunctioning in protection; so occurred various motor protecters on the market, yet they one are not have switching function, the 2nd, there is not memory function.Common mold cased circuit breaker is made of pedestal, lid, arc control device, handle, free tripping mechanism, main shaft, trip shaft, thrermostatic bimetal-plate, instantaneous adjusting, Down Highway, thermal element, magnetictrip, soft connection, fixed contact, moving contact, Up Highway UHW etc.; general tool heat, magnetic are protected, how as distribution branch road load end switch or electric motor protecting switch.Chinese patent once disclosed a kind of " intelligent plastics shell type circuit breaker " (ZL9724326), its main feature is to have an instrument transformer to obtain the control power supply to obtain detection signal again, and above instrument transformer, settle one-chip computer module, tripping relay is carried out the order that one-chip computer module sends.

The purpose of this utility model is to overcome the shortcoming that various thermal relays and air switch and protector exist, and a kind of intelligent residual current circuit breaker is provided, and it not only has creepage protection function, and has functions such as overcurrent protection, phase shortage (phase failure) protection.

For achieving the above object; the solution that the utility model is taked is: a kind of intelligent residual current circuit breaker; comprise base and cover; by switch contact; release; mechanical self-latching and disjunction mechanism form memory component; electronic circuit unit comprises the leakage protection circuit unit; numeral shows the phase current circuit unit; it is characterized in that electronic circuit unit also comprises phase shortage and current-limiting protection circuit unit; three core-theaded type speed saturation type current transformers are supplied with as signal sampling and energy; during normal operation of circuit breaker, electric current detecting coil L21; L22; the L23 primary side has three-phase current I _A, I _B, I _CFlow through core-theaded type speed saturation type current transformer respectively, in electric current detecting coil L21, L22, L23, induce AC voltage, this voltage through diode D22, D24, D26 rectification and through capacitor C 21 and resistance R 24 filtering current limlitings as the internal circuit power supply, another routing resistance R21, R22, R23 current limliting are done each operating current indication mutually with three light-emitting diode D27, D28, D29, also have one tunnel AC/DC conversion and I/U conversion through diode D21, D23, D25 to draw each phase voltage U _WBe input to 7,9,11 pin of integrated circuit (IC) 21 through resistance R 26, R27, R28 and R210, R211, R212 dividing potential drop, form reference voltage U by resistance R 29, R213 dividing potential drop _T6,8,10 pin that are input to integrated circuit (IC) 21 are made each phase current than than usefulness, work as U _W＞U _TThe time, integrated circuit (IC) 21 outputs 1,14,13 pin are electronegative potential, and as protection outputs such as three-phase phase shortage, three-phase imbalances, the promotion circuit of forming via 9013 transistor GB21 makes thyristor BT1690 conducting, makes release get electronic cutting off the electricity supply; Limit detection circuit is made up of AC/DC conversion and I/U translation circuit, is made of the reference voltage U of current-limiting circuit resistance R 25 and diode D27 dividing potential drop _MCompare with ∑ U summing circuit, wherein form the upper limit current of circuit controllable start times such as starting time-delay, current settings and qualification circuit, when ∑ U sues for peace greater than U by resistance R 214, R215, capacitor C 25 etc. _MThe time, integrated circuit (IC) 21 outputs 2 pin are electronegative potential, and the promotion circuit of forming via 9013 transistor GB21 makes thyristor BT1690 conducting, makes release get electronic cutting off the electricity supply.

The utility model is a kind of earth leakage protective device of electronic current action type; owing in electronic circuit unit, also be provided with phase shortage and current-limiting protection circuit unit; make the utility model not only have creepage protection function; and also faults such as phase shortage, overload, overvoltage, overcurrent, three-phase current unbalance all there is defencive function simultaneously; it is applicable in the circuit that exchanges 50Hz, rated voltage 380V, rated current 10A～650A, also can be used as the usefulness of the not Fraquent start of the not frequent transitions of circuit and motor.

Below in conjunction with embodiment and accompanying drawing thereof the utility model is remake description.

Fig. 1 is a leakage protection circuit schematic diagram in the present embodiment electronic circuit unit.

Fig. 2 is phase shortage and a current-limiting protection circuit schematic diagram in the present embodiment electronic circuit unit.

Fig. 3 is that numeral shows the phase current circuit theory diagrams in the present embodiment electronic circuit unit.

As shown in Figure 1, the triple line of present embodiment and zero line all pass the zero sequence current mutual inductor TA ↓ core hole of leakage protection circuit unit.When not having electric leakage at ordinary times, direct puncture zero sequence current mutual inductor TA ↓ phase line and zero line as zero sequence current mutual inductor TA ↓ primary side, the size of current that flows through each line equates, direction is opposite, the miscarriage of second siding ring influence electricity is given birth to, integrated circuit SF54123 ↓ 7 pin Triggerless output, thyristor VT ↓ end, release non-transformer and being failure to actuate.When human body contact phase line is got an electric shock over the ground, directly leak and flow back to the earth with regard to leakage current is arranged without zero line from phase line, phase line and neutral line current are unequal, immediately at zero sequence current mutual inductor TA ↓ second siding ring induced voltage U _IWith integrated circuit SF54123 ↓ 1,2 pin reference voltage U _REFCompare, work as U _I＞U _REFThe time, integrated circuit SF54123 ↓ differential amplifier immediately output current behind capacitor C ↓ 12 integrations, open integrated circuit SF54123 ↓ 7 pin lockings trigger trigger thyristor VT ↓ conducting and make release get electronic cutting off the electricity supply, play the earth leakage protective effect.

As shown in Figure 2, the utility model mainly adopts three core-theaded type speed saturation type current transformers to supply with as signal sampling and energy, and during normal operation of circuit breaker, electric current detecting coil L ↓ 21, L ↓ 22, L ↓ 23 primary sides have three-phase current I _A, I _B, I _CFlow through core-theaded type speed saturation type current transformer respectively, in electric current detecting coil L ↓ 21, L ↓ 22, L ↓ 23, induce AC voltage, this voltage through diode D ↓ 22, D ↓ 24, D ↓ 26 rectifications and through capacitor C ↓ 21 and resistance R ↓ 24 filtering current limlitings as the internal circuit power supply, another routing resistance R ↓ 21, R ↓ 22, R ↓ 23 current limlitings are done each operating current indication mutually with three light-emitting diode D ↓ 27, D ↓ 28, D ↓ 29, also have one tunnel AC/DC conversion and I/U conversion through diode D ↓ 21, D ↓ 23, D ↓ 25 to draw each phase voltage U _WThrough resistance R ↓ 26, R ↓ 27, R ↓ 28 and R ↓ 210, R ↓ 211, R ↓ 212 dividing potential drops are input to 7,9,11 pin of integrated circuit (IC) ↓ 21, form reference voltage U by resistance R ↓ 29, R ↓ 213 dividing potential drops _T6,8,10 pin that are input to integrated circuit (IC) ↓ 21 are made each phase current than than usefulness, work as U _W＞U _TThe time, integrated circuit (IC) ↓ 21 outputs, 1,14,13 pin are electronegative potential, and as protection outputs such as three-phase phase shortage, three-phase imbalances, the promotion circuit of forming via 9013 transistor GB ↓ 21 makes thyristor BT1690 ↓ conducting, make release get electronic cutting off the electricity supply, to reach the purpose of protection; Limit detection circuit is made up of AC/DC conversion and I/U translation circuit, is made of the reference voltage U of current-limiting circuit resistance R ↓ 25 and diode D ↓ 27 dividing potential drops _MCompare with ∑ U summing circuit, wherein form the upper limit current of circuit controllable start times such as starting time-delay, current settings and qualification circuit, when ∑ U sues for peace greater than U by resistance R ↓ 214, R ↓ 215, capacitor C ↓ 25 etc. _MThe time, integrated circuit (IC) ↓ 21 outputs, 2 pin are electronegative potential, and the promotion circuit of forming via 9013 transistor GB ↓ 21 makes thyristor BT1690 ↓ conducting, makes release get electronic cutting off the electricity supply, to reach the purpose of protections such as overcurrent, overvoltage, overload.

As shown in Figure 3, the phase current of three core-theaded types speed saturation type Current Transformer Secondary side induction is after resistance R ↓ 31 are done I/U conversion and diode D ↓ 31 and done the AC/DC conversion, by variable resistor RP ↓ 31, capacitor C ↓ 33 and C ↓ 34 form be input to behind the filtering reduction voltage circuit have 3 (1/2), the integrated circuit (IC) L7107 of double integration A/D converter ↓ 31 pin carry out analog quantity and convert discontinuous, discrete digital form to, and directly the driven for emitting lights diode shows the A of phase current unit with eye-catching red numeral.Power supply is supplied with and is adopted 220VAC to become 6V * 2 by bridge rectifier through transformer T ↓ 31 step-downs, one the tunnel exports after integrated regulator LM7805 ↓ voltage stabilizing, capacitor C ↓ 311 filtering for numeral through capacitor C ↓ 38 filtering, the anti-High-frequency Interference in capacitor C ↓ 39 and to show phase current circuit+5V power supply, another road through capacitor C ↓ 310 filtering, resistance R ↓ 38 step-downs after 5V voltage-stabiliser tube V ↓ 31 voltage stabilizings, capacitor C ↓ 35 filtering for integrated circuit (IC) L7107 ↓ 26 pin for this circuit-the 5V power supply.Integrated circuit (IC) L7107 ↓ reference voltage is adjusted into 1V to improve the accuracy of circuit by resistance R ↓ 32, R ↓ 33.Wherein, also can match by the current settings potentiometer of change over switch and phase shortage and the current-limiting protection circuit unit numeral of cooperation current settings of the above intelligent residual current circuit breaker of 250A shows, current settings has been accomplished intuitively, reliably.

Claims (4)

1, a kind of intelligent residual current circuit breaker; comprise base and cover; form memory component by switch contact, release, mechanical self-latching and disjunction mechanism; electronic circuit unit comprises that leakage protection circuit unit, numeral show the phase current circuit unit; it is characterized in that: electronic circuit unit also comprises phase shortage and current-limiting protection circuit unit; three core-theaded type speed saturation type current transformers are supplied with as signal sampling and energy; during normal operation of circuit breaker, electric current detecting coil L ↓ [21], L ↓ [22], L ↓ [23] primary side have three-phase current I _A, I _B, I _CFlow through core-theaded type speed saturation type current transformer respectively, in electric current detecting coil L ↓ [21], L ↓ [22], induce AC voltage in L ↓ [23], this voltage is through diode D ↓ [22], D ↓ [24], D ↓ [26] rectification and through capacitor C ↓ [21] and resistance R ↓ [24] filtering current limliting as the internal circuit power supply, another routing resistance R ↓ [21], R ↓ [22], R ↓ [23] current limliting and three light-emitting diode D ↓ [27], D ↓ [28], each phase operating current indication is done in D ↓ [29], also has one the tunnel through diode D ↓ [21], D ↓ [23], the AC/DC conversion of D ↓ [25] and I/U conversion draw each phase voltage U _WThrough resistance R ↓ [26], R ↓ [27], R ↓ [28] and R ↓ [210], R ↓ [211], R ↓ [212] dividing potential drop be input to 7,9,11 pin of integrated circuit (IC) ↓ [21], forms reference voltage U by resistance R ↓ [29], R ↓ [213] dividing potential drop _T6,8,10 pin that are input to integrated circuit (IC) ↓ [21] are made each phase current than than usefulness, work as U _W＞U _TThe time, integrated circuit (IC) ↓ [21] output 1,14,13 pin are electronegative potential, as protection outputs such as three-phase phase shortage, three-phase imbalances, the promotion circuit of forming via 9013 transistor GB ↓ [21] makes thyristor BT1690 ↓ conducting, makes release get electronic cutting off the electricity supply; Limit detection circuit is made up of AC/DC conversion and I/U translation circuit, forms the reference voltage U of current-limiting circuit by resistance R ↓ [25] and diode D ↓ [27] dividing potential drop _MCompare with ∑ U summing circuit, wherein form the upper limit current of circuit controllable start times such as starting time-delay, current settings and qualification circuit, when ∑ U sues for peace greater than U by resistance R ↓ [214], R ↓ [215], capacitor C ↓ [25] etc. _MThe time, integrated circuit (IC) ↓ [21] output 2 pin are electronegative potential, and the promotion circuit of forming via 9013 transistor GB ↓ [21] makes thyristor BT1690 ↓ conducting, makes release get electronic cutting off the electricity supply.

2; a kind of intelligent residual current circuit breaker according to claim 1; it is characterized in that: in described leakage protection circuit; triple line and zero line all pass zero sequence current mutual inductor TA ↓ core hole; when not having electric leakage at ordinary times; direct puncture zero sequence current mutual inductor TA ↓ phase line and zero line as zero sequence current mutual inductor TA ↓ primary side; the size of current that flows through each line equates; direction is opposite; the miscarriage of second siding ring influence electricity is given birth to; integrated circuit SF54123 ↓ 7 pin Triggerless output; thyristor VT ↓ end; release non-transformer and being failure to actuate; when human body contact phase line is got an electric shock over the ground; just have leakage current directly to leak and flow back to without zero line to the earth from phase line, phase line and neutral line current are unequal, immediately at zero sequence current mutual inductor TA ↓ second siding ring induced voltage U _IWith integrated circuit SF54123 ↓ 1,2 pin reference voltage U _REFCompare, work as U _I＞U _REFThe time, integrated circuit SF54123 ↓ differential amplifier immediately output current behind capacitor C ↓ [12] integration, open integrated circuit SF54123 ↓ 7 pin lockings trigger trigger thyristor VT ↓ conducting and make release get electronic cutting off the electricity supply.

3, a kind of intelligent residual current circuit breaker according to claim 1, it is characterized in that: show in the phase current circuit in described numeral, the phase current of three core-theaded types speed saturation type Current Transformer Secondary side induction is after resistance R ↓ [31] are done I/U conversion and diode D ↓ [31] and done the AC/DC conversion, by variable resistor RP ↓ [31], be input to behind capacitor C ↓ [33] and C ↓ [34] the composition filtering reduction voltage circuit and have 3 (1/2), the integrated circuit (IC) L7107 of double integration A/D converter ↓ 31 pin carry out analog quantity and convert to discontinuous, discrete digital form, and directly the driven for emitting lights diode shows the A of phase current unit with numeral, power supply is supplied with and is adopted 220VAC to become 6V * 2 by bridge rectifier through transformer T ↓ [31] step-down, one the tunnel through capacitor C ↓ [38] filtering, capacitor C ↓ [39] anti-High-frequency Interference is through integrated regulator LM7805 ↓ voltage stabilizing, output shows phase current circuit+5V power supply for numeral after capacitor C ↓ [311] filtering, another road is through capacitor C ↓ [310] filtering, resistance R ↓ [38] step-down is through 5V voltage-stabiliser tube V ↓ [31] voltage stabilizing, after capacitor C ↓ [35] filtering for integrated circuit (IC) L7107 ↓ 26 pin for this circuit-the 5V power supply, integrated circuit (IC) L7107 ↓ reference voltage is by resistance R ↓ [32], R ↓ [33] are adjusted into 1V to improve the accuracy of circuit.

4, a kind of intelligent residual current circuit breaker according to claim 3 is characterized in that: also can match by the current settings potentiometer of change over switch and phase shortage and the current-limiting protection circuit unit numeral demonstration of cooperation current settings of the above intelligent residual current circuit breaker of 250A.