CN211127104U - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
CN211127104U
CN211127104U CN201922135553.9U CN201922135553U CN211127104U CN 211127104 U CN211127104 U CN 211127104U CN 201922135553 U CN201922135553 U CN 201922135553U CN 211127104 U CN211127104 U CN 211127104U
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circuit
rectification
diode
power supply
resistor
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CN201922135553.9U
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Chinese (zh)
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王帮乐
万新建
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Zhejiang Chint Electrics Co Ltd
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Zhejiang Chint Electrics Co Ltd
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Abstract

The utility model provides a circuit breaker, it includes power supply circuit, electric leakage signal acquisition processing circuit and trip circuit, and power supply circuit is the trip circuit power supply, and electric leakage signal acquisition processing circuit is connected with zero sequence current transformer TA, power supply circuit is including connecting the half-wave rectifier circuit for the trip circuit power supply between trip circuit and power, electric leakage signal acquisition processing circuit is including connecting the full-wave rectifier circuit between zero sequence current transformer TA and the control pole of controllable switch element, when electric leakage fault appears, and signal acquisition processing circuit can switch on controllable switch element through full-wave rectifier circuit, makes power supply circuit pass through half-wave rectifier circuit and supplies power for trip coil KA to through the operating device of trip circuit drive movable iron core unblock circuit breaker, not only can overcome because the unable problem of detecting of diode disappearance and trip coil non-operation when power cord L and power cord N change position, adopt discrete component to build moreover, with low costs, easily promote.

Description

Circuit breaker
Technical Field
The utility model relates to a low-voltage apparatus field especially relates to a circuit breaker.
Background
However, the trip circuit power circuit of the existing discrete residual current circuit breaker generally adopts a full-wave rectification mode, if any one of the rectifier diodes is lost or damaged, the circuit breaker cannot break the circuit with the leakage fault after the power line L and the power line N are exchanged, and the circuit breaker cannot be detected in the common electrical verification process.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a circuit breaker simple structure, that the reliability is high.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a circuit breaker comprises a power circuit, a leakage signal acquisition and processing circuit and a tripping circuit, wherein the power circuit supplies power to the tripping circuit, the leakage signal acquisition and processing circuit is connected with a zero sequence current transformer TA, the tripping circuit comprises a tripping coil KA and a controllable switch element which are connected in series, and the tripping coil KA is used for unlocking an operating mechanism of the circuit breaker; the power supply circuit comprises a half-wave rectification circuit which is connected between the tripping circuit and a power supply and supplies power to the tripping circuit, the leakage signal acquisition and processing circuit comprises a full-wave rectification circuit which is connected between a zero sequence current transformer TA and a control electrode of a controllable switch element, when leakage faults occur, the signal acquisition and processing circuit can conduct the controllable switch element through the full-wave rectification circuit, the power supply circuit supplies power to the tripping coil KA through the half-wave rectification circuit, and the tripping coil KA drives the operating mechanism of the movable iron core unlocking circuit breaker.
Preferably, the zero sequence current transformer TA further comprises a leakage test circuit penetrating through the zero sequence current transformer TA, the leakage test circuit comprises a normally open test switch TB and a test resistor R1 connected in series, and the other ends of the normally open test switch TB and the test resistor R1 are respectively connected with a phase line and a neutral line of the power supply.
Preferably, the power circuit further comprises a surge protection circuit, and the surge protection circuit comprises a voltage dependent resistor RV connected between a phase line and a neutral line of the power supply.
Preferably, the controllable switch element is a thyristor VT, and a G pole of the thyristor VT is connected to an output end of a full-wave rectification circuit of the leakage signal acquisition and processing circuit.
Preferably, the half-wave rectifier circuit includes at least one rectifier diode connected in series between the thyristor VT and the power supply.
Preferably, the full-wave rectification circuit comprises a rectification bridge composed of a rectification diode VD5, a rectification diode VD6, a rectification diode VD7 and a rectification diode VD8, two input ends of the rectification bridge are respectively connected with two ends of a secondary circuit of the zero sequence current transformer TA, a negative output end of the rectification bridge is connected with one end of the thyristor VT, and a positive output end of the rectification bridge is connected with a control electrode of the controllable switching element.
Preferably, the half-wave rectification circuit comprises a rectification diode VD1 with the negative electrode connected with the A electrode of the controllable silicon VT and a rectification diode VD2 with the positive electrode connected with the K electrode of the controllable silicon VT, and the positive electrode of the rectification diode VD1 and the negative electrode of the rectification diode VD2 are respectively connected with the phase line and the middle line.
Preferably, the half-wave rectifier circuit further comprises a resistor R4 and a capacitor C2 which are connected in series, and the resistor R4 and the capacitor C2 are connected in series and then connected in parallel between the K pole of the thyristor VT and the A pole of the thyristor VT.
Preferably, the full-wave rectification circuit comprises a rectification bridge composed of a rectification diode VD5, a rectification diode VD6, a rectification diode VD7 and a rectification diode VD8, an anode of the rectification diode VD6 is connected with a cathode of the rectification diode VD7 to form an input end of the rectification bridge, an anode of the rectification diode VD5 is connected with a cathode of the rectification diode VD8 to form another input end of the rectification bridge, two input ends of the rectification bridge are respectively connected with two ends of a secondary circuit of the zero-sequence current transformer TA, a cathode of the rectification diode VD5 is connected with a cathode of the rectification diode VD6 to form an anode output end of the rectification bridge, the anode output end is connected in series with a resistor R3 and then connected with a G pole of the thyristor VT, an anode of the rectification diode VD7 is connected with an anode of the rectification diode VD8 to form a cathode output end of the rectification bridge, and the cathode output end is connected with a K pole of the thyristor.
Preferably, the leakage signal collecting and processing circuit further includes a capacitor C1, a capacitor C3, a resistor R1, and a zener diode DZ, where two input terminals of the capacitor C1, the resistor R1, and the rectifier bridge are respectively connected in parallel to two ends of the secondary circuit of the zero-sequence current transformer TA; the voltage stabilizing diode DZ is connected in parallel between the anode output end and the cathode output end of the rectifier bridge; the capacitor C3 is connected in parallel between the G pole of the thyristor VT and the K pole of the thyristor VT.
Preferably, the leakage signal collecting and processing circuit further comprises a resistor R5 connected in series with the resistor R3 for voltage division, and the G pole of the thyristor VT is connected between the resistor R3 and the resistor R5.
The utility model discloses a circuit breaker, signal acquisition and processing circuit switch on controllable switch element through full wave rectifier circuit when the electric leakage trouble appears, make power supply circuit pass through half-wave rectifier circuit and be the power supply of trip coil KA, have following characteristics:
1. if the half-wave rectifier circuit has the problem of diode loss or damage, the situation that the detection cannot be carried out in the electric verification process can be avoided;
2. the problem that a trip coil does not act when the position of a power line L of the circuit breaker is exchanged with the position of a power line N can be avoided, and the reliability of the circuit breaker is effectively improved;
3. the controllable switch element can still be conducted in a sine wave period, and the problem of burning down caused by overlong conduction time of a tripping circuit is avoided;
4. the circuit of the utility model is built by discrete components, half-wave rectification treatment is carried out at the power end, and full-wave treatment is carried out at the electric leakage signal acquisition and processing circuit (signal end), so that the cost is extremely low, the popularization is easy, and expensive integrated circuits such as IC chips are not needed;
5. the utility model discloses only be applicable to single-phase power supply, and the half-wave rectifier circuit of necessary power end must use with the full wave rectification cooperation of electric leakage signal acquisition processing circuit, otherwise unable normal work.
Drawings
Fig. 1 is a block diagram of a circuit breaker according to an embodiment of the present invention;
FIG. 2 is a first embodiment of a power supply circuit according to an embodiment of the present invention;
FIG. 3 is a second embodiment of a power supply circuit according to an embodiment of the present invention;
FIG. 4 is a third embodiment of a power supply circuit according to an embodiment of the present invention;
FIG. 5 is a fourth embodiment of a power supply circuit according to an embodiment of the present invention;
fig. 6 is a second implementation manner of the leakage signal collecting and processing circuit according to the embodiment of the present invention.
Detailed Description
The following describes the circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 6. The circuit breaker of the present invention is not limited to the description of the following embodiments.
As shown in fig. 1-2, the circuit breaker of the present invention includes a power circuit, a leakage signal collecting and processing circuit and a trip circuit, wherein the power circuit supplies power to the trip circuit, and the leakage signal collecting and processing circuit is connected with a zero sequence current transformer TA to form a trip circuit;
the tripping circuit comprises a tripping coil KA and a controllable switch element which are connected in series, and the tripping coil KA is used for driving the movable iron core to unlock the operating mechanism of the circuit breaker; the power supply circuit comprises a half-wave rectification circuit which is connected between the tripping circuit and a power supply and supplies power to the tripping circuit, the leakage signal acquisition and processing circuit comprises a full-wave rectification circuit which is connected between a control electrode of a zero sequence current transformer TA and a controllable switch element, when the zero sequence current transformer TA senses leakage fault, the signal acquisition and processing circuit can conduct the controllable switch element through the full-wave rectification circuit, the power supply circuit supplies power to the tripping coil KA through the half-wave rectification circuit, and the operating mechanism of the movable iron core unlocking circuit breaker is driven through the tripping coil KA.
The utility model discloses a circuit breaker, signal acquisition and processing circuit switch on controllable switch element through full wave rectifier circuit when the electric leakage trouble appears, make power supply circuit pass through half-wave rectifier circuit and be the power supply of trip coil KA, have following characteristics:
1. if the half-wave rectifier circuit has the problem of diode loss or damage, the situation that the detection cannot be carried out in the electric verification process can be avoided;
2. the problem that a trip coil does not act when the position of a power line L of the circuit breaker is exchanged with the position of a power line N can be avoided, and the reliability of the circuit breaker is effectively improved;
3. the controllable switch element can still be conducted in a sine wave period, and the problem of burning down caused by overlong conduction time of a tripping circuit is avoided;
4. the circuit of the utility model is built by discrete components, half-wave rectification treatment is carried out at the power end, and full-wave treatment is carried out at the electric leakage signal acquisition and processing circuit (signal end), so that the cost is extremely low, the popularization is easy, and expensive integrated circuits such as IC chips are not needed;
5. the utility model discloses only be applicable to single-phase power supply, and the half-wave rectifier circuit of necessary power end must use with the full wave rectification cooperation of electric leakage signal acquisition processing circuit, otherwise unable normal work.
And the leakage testing circuit penetrates through the zero sequence current transformer TA and comprises a normally open testing switch TB and a testing resistor R1 which are connected in series, and the other ends of the normally open testing switch TB and the testing resistor R1 are respectively connected with a phase line and a neutral line of the power supply. And a closed normally-open test switch TB forms a path between a phase line and a neutral line of the power supply to simulate the occurrence of leakage faults, carries out leakage tripping test on a tripping circuit and detects whether the circuit breaker can disconnect the power supply.
Further, the power supply circuit further comprises a surge protection circuit, the surge protection circuit comprises a voltage dependent resistor RV connected between a phase line and a neutral line of the power supply, and the voltage dependent resistor RV is used for absorbing surge.
Fig. 2-6 show five embodiments of the power supply circuit, respectively, four embodiments of the power supply circuit having the following features:
the controllable switch element is a controllable silicon VT, and the G pole of the controllable silicon VT is connected with the output end of the full-wave rectifying circuit of the leakage signal acquisition and processing circuit. Of course, the controllable switch element can also be a triode or a MOS transistor, all belong to the protection scope of the present invention, but the silicon controlled rectifier VT has the characteristics of small volume, high efficiency and low cost.
The half-wave rectification circuit comprises at least one rectification diode connected in series between the controlled silicon VT and the power supply, performs half-wave rectification by utilizing the conduction characteristic of the controlled silicon VT, and has the characteristics of less parts, small volume and low cost. Of course, the half-wave rectifier circuit may also be composed of two rectifier diodes, all belonging to the protection scope of the present invention.
The tripping coil KA can be directly connected with the controlled silicon VT in series or can be connected with the controlled silicon VT in series through a half-wave rectification circuit. Namely, two ends of the trip coil KA are connected between the half-wave rectification circuit and the power supply, or between the controllable switching element and the half-wave rectification circuit.
Specifically, when the half-wave rectification circuit includes a rectifier diode, two ends of the trip coil KA are connected between the half-wave rectification circuit and the power supply (fig. 3), or two ends of the trip coil KA are connected between the thyristor VT and the power line (not shown in the figure); when half-wave rectifier circuit includes two rectifier diode, the both ends that trip coil KA can are connected between arbitrary rectifier diode and power (fig. 2, 5), or the both ends of trip coil KA are connected between arbitrary rectifier diode and silicon controlled rectifier VT (fig. 6), all belong to the utility model discloses a protection scope.
When the power end adopts half-wave rectification (equivalent to diode loss or damage during full-wave rectification), only one half-wave exists in the A pole of the controlled silicon VT, if the half-wave exists, when the negative half-cycle of the residual current signal exists in the circuit corresponds to the positive half-cycle of the power supply, the voltage between the G pole and the K pole of the controlled silicon VT is negative, the voltage between the A pole of the controlled silicon VT and the K pole of the controlled silicon VT is positive, the controlled silicon VT can not be normally conducted, and the condition that the detection cannot be carried out in the electric checking process is avoided.
At the moment, the positions of the power line L and the power line N are exchanged to enable the thyristor VT to be conducted, if the residual current signal is rectified, the G pole of the thyristor VT is positive voltage relative to the K pole of the thyristor VT as long as the residual current signal exists, and the thyristor VT can be normally conducted as long as the A pole voltage of the thyristor VT is greater than the K pole voltage of the thyristor VT, so that the problem that a tripping coil does not act when the position of the circuit breaker power line L and the position of the power line N are exchanged is solved.
In addition, the thyristor VT can be conducted when the A pole of the thyristor VT and the K pole of the thyristor VT are in positive voltage even if the G pole trigger voltage is withdrawn under the condition that the G pole is triggered, the thyristor VT can be closed only when the G pole trigger voltage of the thyristor VT is withdrawn and the voltage between the A pole of the thyristor VT and the K pole of the thyristor VT is zero, the thyristor VT can be reliably conducted in a positive half period and reliably closed in a negative half period during half-wave rectification, the long-time electrification of a tripping loop can be avoided, and the problem of burnout of the tripping loop is avoided. And, during the half-wave rectification, the voltage step-down between the A utmost point of silicon controlled rectifier VT and the K utmost point of silicon controlled rectifier VT, the electric current that passes through when silicon controlled rectifier VT switches on also reduces, improves components and parts life, simultaneously according to silicon controlled rectifier VT's conduction characteristic, silicon controlled rectifier VT switches on and just can close when only silicon controlled rectifier VT's A utmost point zero crossing, adopts the half-wave rectification can make silicon controlled rectifier VT effectively close, avoids the release circuit to continuously lead to the heavy current, further avoids trip coil to burn out.
As shown in fig. 2, in the first embodiment of the power supply circuit, the controllable switching element is a thyristor VT, a G pole of the thyristor VT is connected to an output end of a full-wave rectification circuit of the leakage signal collecting and processing circuit, the half-wave rectification circuit includes a rectifying diode VD1 having a cathode connected to an a pole of the thyristor VT, and a rectifying diode VD2 having an anode connected to a K pole of the thyristor VT, and an anode of the rectifying diode VD1 and a cathode of the rectifying diode VD2 are respectively connected to a phase line and a neutral line.
Further, the half-wave rectification circuit also comprises a resistor R4 and a capacitor C2 which are connected in series, and the resistor R4 and the capacitor C2 are connected in series and then connected in parallel between the K pole of the thyristor VT and the A pole of the thyristor VT. The resistor-capacitor filter circuit formed by the resistor R4 and the capacitor C2 can filter rectified signals, and the influence of spike pulses on the circuit is avoided.
As shown in fig. 3, a second embodiment of the power supply circuit, which is different from the first embodiment described above in that the half-wave rectifier circuit has only one rectifier diode VD2 and does not include the rectifier diode VD 1. The half-wave rectification circuit of the embodiment comprises a rectification diode VD2 with the positive electrode connected with the K electrode of the controlled silicon VT, and the negative electrode of the rectification diode VD2 is connected with the phase line and the middle line. This embodiment passes through rectifier diode VD2 and silicon controlled rectifier VT cooperation, utilizes silicon controlled rectifier VT's conducting characteristic to carry out half-wave rectification, has the part quantity characteristics of being few, small and with low costs.
As shown in fig. 4, the third embodiment of the power supply circuit is basically the same as the first embodiment, and each half-wave rectifier circuit includes a rectifier diode VD1 and a rectifier diode VD2, except that both ends of the trip coil KA of the present embodiment are connected between the rectifier diode VD1 and the power supply, while both ends of the trip coil KA of the first embodiment are connected between the rectifier diode VD2 and the power supply.
As shown in fig. 5, a fourth embodiment of the power supply circuit is basically the same as the first embodiment, and each half-wave rectifier circuit includes a rectifier diode VD1 and a rectifier diode VD2, except that both ends of the trip coil KA of the present embodiment are connected between the rectifier diode VD1 and the thyristor VT. Of course, both ends of the trip coil KA may also be connected between the rectifier diode VD2 and the thyristor VT.
When a leakage signal detected by the zero sequence current transformer TA exceeds a set value, an output signal induced by the secondary side of the zero sequence current transformer is processed to trigger a G pole of the thyristor VT, the thyristor VT forms a loop with the diode VD1, the diode VD2 and the trip coil after being conducted, and the trip coil attracts the iron core when current passes through the trip coil so as to unlock the operating mechanism, namely, the operating mechanism is driven to trip. After the tripping circuit adopts a half-wave rectification mode, if the normal action of a product in a sine wave period is ensured, namely the silicon VT is effectively conducted, the electric leakage signal acquisition and processing circuit needs to carry out full-wave rectification processing.
Fig. 2 and fig. 6 respectively show two embodiments of the leakage signal acquisition and processing circuit, and both embodiments of the leakage signal acquisition and processing circuit have the following features: the full-wave rectification circuit comprises a rectification bridge consisting of a rectification diode VD5, a rectification diode VD6, a rectification diode VD7 and a rectification diode VD8, two input ends of the rectification bridge are respectively connected with two ends of a secondary circuit of the zero sequence current transformer TA, a negative output end of the rectification bridge is connected with one end of a controllable silicon VT, and a positive output end of the rectification bridge is connected with a control electrode of a controllable switching element.
As shown in fig. 2, which shows a first embodiment of the leakage signal collecting and processing circuit, the full-wave rectifying circuit comprises a rectifying diode VD5, a rectifying diode VD6, the rectifier bridge comprises a rectifier diode VD7 and a rectifier diode VD8, the positive pole of the rectifier diode VD6 is connected with the negative pole of the rectifier diode VD7 to form the input end of the rectifier bridge, the positive pole of the rectifier diode VD5 is connected with the negative pole of the rectifier diode VD8 to form the other input end of the rectifier bridge, the two input ends of the rectifier bridge are respectively connected with two ends of a secondary circuit of the zero-sequence current transformer TA, the negative pole of the rectifier diode VD5 is connected with the negative pole of the rectifier diode VD6 to form the positive output end of the rectifier bridge, the positive output end is connected in series with a resistor R3 and then connected with the G pole of the thyristor VT, the positive pole of the rectifier diode VD7 is connected with the positive pole of the rectifier diode VD8 to form the negative output end of the rectifier bridge, and the negative output end of the negative pole.
Further, the leakage signal acquisition processing circuit further comprises a capacitor C1, a capacitor C3, a resistor R1 and a zener diode DZ, wherein two input ends of the capacitor C1, the resistor R1 and the rectifier bridge are respectively connected in parallel to two ends of a secondary circuit of the zero sequence current transformer TA; the voltage stabilizing diode DZ is connected in parallel between the anode output end and the cathode output end of the rectifier bridge; the capacitor C3 is connected in parallel between the G pole of the thyristor VT and the K pole of the thyristor VT.
As shown in fig. 6, a second embodiment of the leakage signal collecting and processing circuit is basically the same as the first embodiment, and the difference is that the leakage signal collecting and processing circuit of the present embodiment further includes a resistor R5 connected in series with the resistor R3 for voltage division, and the G-pole of the thyristor VT is connected between the resistor R3 and the resistor R5.
The utility model discloses a leakage signal gathers processing circuit, the phase line of power and the central line of power pass zero sequence transformer TA respectively, when leakage current produces, the signal that zero sequence transformer TA both ends produced is through electric capacity C1 filtering spike interference signal in the twinkling of an eye, again through debugging resistance R1, rectifier bridge D1, stabilivolt DZ, resistance R3, electric capacity C4 debugs respectively, the rectification, the steady voltage, filtering treatment, signal after handling links to each other with silicon controlled rectifier VT's G utmost point, be used for triggering silicon controlled rectifier VT and switch on, its key lie in carrying out can guarantee when power supply circuit is half-wave rectification mode after the full wave rectification to the collection signal, still can trigger silicon controlled rectifier VT action in a sine wave cycle.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (11)

1. A circuit breaker, characterized by: the circuit breaker comprises a power circuit, a leakage signal acquisition and processing circuit and a tripping circuit, wherein the power circuit supplies power to the tripping circuit, the leakage signal acquisition and processing circuit is connected with a zero sequence current transformer TA, the tripping circuit comprises a tripping coil KA and a controllable switch element which are connected in series, and the tripping coil KA is used for unlocking an operating mechanism of the circuit breaker; the power supply circuit comprises a half-wave rectification circuit which is connected between the tripping circuit and a power supply and supplies power to the tripping circuit, the leakage signal acquisition and processing circuit comprises a full-wave rectification circuit which is connected between a zero sequence current transformer TA and a control electrode of a controllable switch element, when leakage faults occur, the signal acquisition and processing circuit can conduct the controllable switch element through the full-wave rectification circuit, the power supply circuit supplies power to the tripping coil KA through the half-wave rectification circuit, and the tripping coil KA drives the operating mechanism of the movable iron core unlocking circuit breaker.
2. The circuit breaker of claim 1, wherein: the leakage testing circuit comprises a normally open testing switch TB and a testing resistor R1 which are connected in series, and the other ends of the normally open testing switch TB and the testing resistor R1 are respectively connected with a phase line and a neutral line of a power supply.
3. The circuit breaker of claim 1, wherein: the power supply circuit further comprises a surge protection circuit, and the surge protection circuit comprises a voltage dependent resistor RV connected between a phase line and a neutral line of the power supply.
4. The circuit breaker of claim 1, wherein: the controllable switch element is a controllable silicon VT, and the G pole of the controllable silicon VT is connected with the output end of the full-wave rectifying circuit of the leakage signal acquisition and processing circuit.
5. The circuit breaker of claim 4, wherein: the half-wave rectifying circuit comprises at least one rectifying diode connected in series between the thyristor VT and the power supply.
6. The circuit breaker of claim 1, wherein: the full-wave rectification circuit comprises a rectification bridge consisting of a rectification diode VD5, a rectification diode VD6, a rectification diode VD7 and a rectification diode VD8, two input ends of the rectification bridge are respectively connected with two ends of a secondary circuit of the zero sequence current transformer TA, a negative output end of the rectification bridge is connected with one end of a controllable silicon VT, and a positive output end of the rectification bridge is connected with a control electrode of a controllable switching element.
7. The circuit breaker of claim 4, wherein: the half-wave rectification circuit comprises a rectification diode VD1 with the negative electrode connected with the A pole of the controllable silicon VT and a rectification diode VD2 with the positive electrode connected with the K pole of the controllable silicon VT, and the positive electrode of the rectification diode VD1 and the negative electrode of the rectification diode VD2 are respectively connected with the phase line and the middle line.
8. The circuit breaker of claim 4, wherein: the half-wave rectifying circuit further comprises a resistor R4 and a capacitor C2 which are connected in series, and the resistor R4 and the capacitor C2 are connected in series and then connected in parallel between the K pole of the thyristor VT and the A pole of the thyristor VT.
9. The circuit breaker of claim 4, wherein: the full-wave rectification circuit comprises a rectification bridge consisting of a rectification diode VD5, a rectification diode VD6, a rectification diode VD7 and a rectification diode VD8, wherein the positive electrode of the rectification diode VD6 is connected with the negative electrode of the rectification diode VD7 to form an input end of the rectification bridge, the positive electrode of the rectification diode VD5 is connected with the negative electrode of the rectification diode VD8 to form the other input end of the rectification bridge, the two input ends of the rectification bridge are respectively connected with two ends of a secondary circuit of the zero-sequence current transformer TA, the negative electrode of the rectification diode VD5 is connected with the negative electrode of the rectification diode VD6 to form a positive electrode output end of the rectification bridge, the positive electrode output end is connected with a resistor R3 in series and then connected with a G electrode of the thyristor VT, the positive electrode of the rectification diode VD7 is connected with the positive electrode of the rectification diode 8 to form a negative electrode output end of the rectification bridge.
10. The circuit breaker of claim 9, wherein: the leakage signal acquisition and processing circuit further comprises a capacitor C1, a capacitor C3, a resistor R1 and a voltage stabilizing diode DZ, wherein two input ends of the capacitor C1, the resistor R1 and a rectifier bridge are respectively connected in parallel with two ends of a secondary circuit of the zero sequence current transformer TA; the voltage stabilizing diode DZ is connected in parallel between the anode output end and the cathode output end of the rectifier bridge; the capacitor C3 is connected in parallel between the G pole of the thyristor VT and the K pole of the thyristor VT.
11. The circuit breaker of claim 9, wherein: the leakage signal acquisition and processing circuit further comprises a resistor R5 which is connected with the resistor R3 in series and used for voltage division, and the G pole of the controllable silicon VT is connected between the resistor R3 and the resistor R5.
CN201922135553.9U 2019-12-03 2019-12-03 Circuit breaker Active CN211127104U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113406533A (en) * 2021-06-04 2021-09-17 青岛鼎信通讯股份有限公司 Passive electric leakage monitoring circuit used in cooperation with acquisition terminal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113406533A (en) * 2021-06-04 2021-09-17 青岛鼎信通讯股份有限公司 Passive electric leakage monitoring circuit used in cooperation with acquisition terminal

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