55results about How to "Reliable trip" patented technology

A hand power tool has an electric motor, which is located in a housing and by way of which a tool insert located in a tool retainer is drivable in rotation, a guard device with which an uncontrollable blockage of the tool insert is detectable via a sensor unit and with which the housing is blockable in its motion; the guard device includes a mechanical unlocking unit that is manually actuatable by a user's action force, and gear is actuatable via an on / off switch for actuating the unlocking unit.

The invention relates to an electronic power supply device, particularly a switched-mode power supply, for supplying power to a low-voltage load protected by a protective device, and to a method therefor. The invention also relates to a device for protecting a low-voltage load against an excess current and to an auxiliary power supply device for use with such a protection device. The conceptual core of the invention can be seen in providing measures which ensure that after a fault has been detected, for example a short circuit at the output, a current is supplied for a short period, for example 15 ms, which is of such a magnitude that a protective device can be reliably and quickly tripped. The period for this is selected in such a manner that electronic components, connected loads and feedlines are not damaged and destroyed.

A ground fault circuit interrupter (GFCI) control circuit for providing an indicator or trip at the end of life. A GFCI with a monitor circuit added, in addition to common functions, is intended to automatically detect and indicate an abnormity of the circuit. Once any abnormity occurs to the elemental parts, the control circuit will indicate the malfunction or trip directly and stop the flow of electricity.

A ground fault circuit interrupter (GFCI) control circuit for providing an indicator or trip at the end of life. A GFCI with a monitor circuit added, in addition to common functions, is intended to automatically detect and indicate an abnormity of the circuit. Once any abnormity occurs to the elemental parts, the control circuit will indicate the malfunction or trip directly and stop the flow of electricity.

The invention provides an electronic tripping device with the function of monitoring a tripping power source, which comprises a current transformer connected with a circuit interrupter, wherein a rectification circuit and a power circuit for power supply are sequentially connected with the current transformer, the power circuit is connected with an electronic processing unit and an operating mechanism, the electronic processing unit is connected with a current sensing and measuring device for detecting fault current, a judging unit is arranged between the power circuit and the operating mechanism, and the judging unit is connected with the electronic processing unit; and the judging unit is used for judging whether the tripping power source is ready according to the voltage at two ends of an energy-storage capacitor provided by the power circuit and the reference voltage provided by the electronic processing unit, and transmitting a tripping signal to the operating mechanism in cooperation with a received tripping order of the electric processing unit under the condition that the tripping power source is prepared. The electronic tripping device has the beneficial effects that the device is more reliable in tripping, and the time required for quickly protecting the electronic tripping device can be shortened.

The invention relates to a multifunctional fireproof overload protective plug base, which comprises over-current sensor on circuit board, zero-sequence inducer, test button, return button element, control circuit, electromagnetic release device, two couples of stable contactor and movable contactor relative to N and L poles, and one stable magnet fixed on frame. The invention uses dual-magnetic release method to switch the contactors, without mechanical abrasion and sliding condition. And it has high current divert ability and high sensitivity. It has overload protection and leakage protection functions.

An electric shock prevention device for an electric welding machine is provided with a finger ring line, an electric shock prevention circuit, a finger ring line detecting circuit and a transmission switching signal circuit, wherein output of the electric shock prevention circuit and output of the finger ring line detecting circuit are respectively connected with an electric leakage protection unit, the transmission switching signal circuit is connected with the electric leakage protection unit through a required switching circuit, and the finger ring line comprises a core wire, an insulating layer, a shielding layer and an outer insulating layer in a wrapping manner from inside to outside. The electric shock prevention device is rapid and reliable in tripping and excellent in electric shock prevention effect. The simple finger ring signal line (the signal line is sleeved on a finger or held in a hand, or the signal line is connected with a conductor, and then the conductor contacts with the hand or a wrist, an ankle and the like) synchronously and accurately extracts weak electric induction signals when an optional portion of the body of an electric welder is in electric shock, and rapidly drives an electric leakage protector, a specially customized high-power relay or a specially customized contactor to cut off power (a person in electric shock can be protected by driving the high-power relay or the contactor to cut off the power).

A power-on reset circuit includes a first PNP transistor having an emitter, a base, and a collector coupled to ground; a second PNP transistor having an emitter coupled to the base of the first transistor, and a base and collector coupled to ground; a third PNP transistor having an emitter, a base coupled to the base of the first transistor, and a collector coupled to ground; a first resistor coupled between VDD and an internal node; a second resistor coupled between VDD and the emitter of the first transistor; a third resistor coupled between the internal node and the emitter of the third transistor; and a comparator having a first input coupled to the internal node and a second input coupled to the emitter of the first transistor for generating a power-on reset signal.

The invention discloses a nanocrystalline magnetic core magnetic field heat treatment method suitable for an A type leakage protector. The method comprises the following steps that firstly, a to-be-treated nanocrystalline magnetic core is placed in a transverse magnetic furnace, and inflation of protective gas is conducted; secondly, heat treatment and magnetic treatment are conducted and includea first stage, a second stage, a third stage and a fourth stage, wherein in the first stage, the temperature is increased to about 560 DEG C from the room temperature, and heating and heat preservation are conducted for about 90 min; in the second stage, the nanocrystalline magnetic core subjected to heat treatment in the first stage is discharged out of a furnace and cooled to the room temperature; in the third stage, the nanocrystalline magnetic core cooled in the second stage is placed in the transverse magnetic furnace, the temperature is increased to about 420 DEG C from the room temperature, heating and heat preservation are conducted for about 60 min, and transverse magnetism adding treatment is conducted during annealing; and in the fourth stage, furnace discharging is conducted, and the nanocrystalline magnetic core is cooled to the room temperature; and thirdly, a cooled nanocrystalline magnetic core finished product is obtained. The nanocrystalline magnetic core obtained through the above method is used for the leakage protector, electric leakage can be protected, and direct current pulsating current can be protected as well.

The invention discloses a trip relay 1 comprising a magnetic circuit composed of a yoke 2 and a magnetic armature 4 as deflection armature, wherein the yoke 2 having a magnetic circuit coil limb 8 and a magnetic circuit pivot limb 7. In order to match the magnetic fluxes, the magnetic circuit pivot limb (7) and / or magnetic armature 4 has reducing cross section (15).

The invention relates to a circuit breaker structure achieving rapid releasing through electric repulsion force and a circuit breaker. The circuit breaker structure comprises a static contact, a moving contact, an elastic piece and an operating mechanism. An execution unit is arranged between the moving contact and the operating mechanism and comprises a draw bar, the draw bar and the operating mechanism are hinged and matched, the draw bar moves to actuate the operating mechanism, a first connecting bar is arranged at the tail end of the moving contact, a second connecting bar is fixedly connected with the tail end of a rotating shaft, the other end of the second connecting bar actuates the draw bar, one end of the first connecting bar is rotationally connected with the tail end of the moving contact, and the other end of the first connecting bar is fixedly connected with the middle of the second connecting bar. When the rotating shaft and the moving contact are linked, the first connecting bar and the second connecting bar do not move. When the moving contact overcomes elastic force of the elastic piece and moves relative to the rotating shaft, the first connecting bar drives the second connecting bar to move to drive the draw bar to make the operating mechanism released, when the moving contact is repelled by the electric repulsion force, the circuit breaker operating mechanism can be synchronously triggered, the mechanism can be rapidly released, and secondary drop of the moving contact and fusion welding of the contacts can be avoided.

The invention discloses a power leakage protector which not only can protect electric shock accidents caused by faults of electric appliances, but also can prevent electric shock accidents caused by accidental electrification of an earth wire. The power leakage protector is further provided with a weak current detection sensor, a primary winding and a secondary winding of the weak current detection sensor are wound on an iron core of the weak current detection sensor, a detection circuit formed by connecting the primary winding with a current-limiting resistance-capacitance element in series is connected between the earth wire and a zero wire, one output end and another output end of the secondary winding of the weak current detection sensor are respectively connected with one input end and another input end of a second group of input ends in a driving circuit of an electromagnetic coil, one wire end and another wire end of the electromagnetic coil, and the anode and cathode of a first silicon controlled thyristor, and the anode and the cathode of a second silicon controlled thyristor are respectively connected in parallel with the anode and a public electrode on an output end of a rectification circuit.

The invention discloses a leakage protecting device, which not only can prevent electric-shock accidents caused by malfunctions of electric appliances, but also can prevent the electric-shock accidents caused by the accidental electrification of a ground wire and the abnormality of a power supply. The leakage protecting device is provided with a weak-current detection inductor, wherein a detection circuit which is formed by serially joining a primary winding of the weak-current detection inductor and a current-limiting resistance-capacitance element is arranged between the ground wire and a zero wire, the output ends of secondary windings of a zero-sequence current mutual inductor and the weak-current detection inductor are respectively connected with input ends of a first amplification circuit and a second amplification circuit, output ends of the first and the second amplification circuits are respectively connected with anodes of a first diode and a second diode, cathodes of the first and the second diodes are respectively connected with a trigger electrode of a controllable silicon, the anode and the cathode of the controllable silicon are respectively connected with the anodeand a common electrode on an output end of a rectifier circuit, and an electromagnetic coil is arranged between the anode and the common electrode on the output end of the rectifier circuit.

The invention discloses an electric leakage protection plug, which can prevent an electric shock accident caused by electrical faults and can prevent the electric shock accident caused by accidental electrification of a ground wire. In the electric leakage protection plug, a detection winding is wound on a zero-sequence current transformer; the detection winding and a secondary winding of the zero-sequence current transformer are respectively wound on an iron core of the zero-sequence current transformer; the detection winding and the secondary winding of the zero-sequence current transformer are insulated and separated from each other; a detection loop which is formed by connecting the detection winding of the zero-sequence current transformer and a current-limiting capacitance resistance element in series is connected between the ground wire and a zero line; output ends of the secondary winding of the zero-sequence current transformer are respectively connected with a trigger electrode and a cathode of a thyristor in parallel; and an anode and the cathode of the thyristor are respectively connected with positive and negative electrodes of the output end of a rectification circuit.

The invention relates to protection level adjustable tripping devices for a molded case circuit breaker. The tripping devices comprises tension springs, a sliding adjusting button, a supporting part, adjusting drawing bars, adjusting screws, nuts, sleeves, movable iron cores, magnetic coils, static iron cores, magnet yokes, bases, compression springs, tripping parts and tripping drawing bars. The ends of the tension springs are connected with the adjusting screws, and the other ends are connected with the adjusting drawing bar. The ends of the sliding adjusting buttons are connected with the adjusting drawing bar, and the other ends are snapped at corresponding positions of the supporting part. The movable iron cores are formed by threaded connection of the adjusting screws and the sleeves, the ends of the adjusting screws are connected with the tension springs, and the other ends are in threaded connection with the sleeves. The magnetic coils and the static iron cores are arranged in rectangular cavities formed by magnet yokes and the bases, and the static iron cores are fixed below the movable iron cores. According to the device, the structure is simple, tripping is reliable, the multi-current-level adjustable function is achieved, and the production efficiency and the verification efficiency are greatly improved.

The invention discloses a leakage protection plug, which not only can prevent electrical shock caused by electrical equipment faults, but also can prevent electrical shock caused by accidental electrification of an earth wire. The leakage protection plug is also provided with a weak electric current detection sensor, wherein the weak electric current detection sensor is provided with an iron core, a primary winding and a secondary winding, the primary winding and the secondary winding of the weak electric current detection sensor are both wound on the iron core and are insulatively separated, a detection circuit formed by connecting the primary winding of the weak electric current detection sensor and a flow resistance capacitance resistance element in series is connected between the earth wire and a zero line, and an output end of the primary winding of the weak electric current detection sensor and an output end of a secondary winding of a zero sequence current mutual inductor are respectively connected with an input end of a drive circuit of an electromagnetic coil in parallel.

The invention discloses a breaking and closing brake driving device of a miniature circuit breaker. The breaking and closing brake driving device comprises a shell, a circuit board, a motor, a transmission gear assembly and a clutch connection mechanism, wherein the circuit board, the motor, the transmission gear assembly and the clutch connection mechanism are arranged on the shell, the motor iselectrically connected with the circuit board, the motor is used for achieving driving of the clutch connection mechanism by the transmission gear assembly, the clutch connection mechanism comprises alast-stage gear and a transmission piece, the last-stage gear is arranged at a tail end of the transmission gear assembly and is engaged with the transmission gear assembly, one end of the transmission piece extends out of the shell and is connected with a circuit breaker handle, the last-stage gear, the transmission piece and the circuit breaker handle are coaxially arranged, and the transmission piece is driven to rotate by the last-stage gear. By arranging the clutch connection mechanism at the last stage, and position detection and control are facilitated.

Disclosed is an adjustable clapper electromagnetic release, belonging to the breaker technical field. The adjustable clapper electromagnetic release comprises a current-carrying wire, a first bracket fixed on the current-carrying wire, a second bracket which is hinged on the first bracket, an armature iron fixed on the second bracket and an iron core which is fixed on the current-carrying wire and corresponds with the armature iron. The iron core comprises a first U-shaped core body and a second U-shaped core body, which are fixed with the current-carrying wire. The adjustable clapper electromagnetic release has the advantages that the adjustable clapper electromagnetic release adopts the first U-shaped core body and the second U-shaped core body which develop into two separate magnetic loops with the armature iron; in this way, the first U-shaped core body and the second U-shaped core body develop four magnetic air gaps Delta with the armature iron, thus enlarging the magnetic area S; meanwhile, the number of the ampere-turns that running through the first U-shaped core body is larger, so even when small current runs through the current-carrying wire, large magnetic force will be generated, thus ensuring sensitive and reliable release; the current adjustment range can be enlarged from 200-250A in the prior art to 125-250A.

The invention discloses a leakage protection plug which can prevent electric shock accidents caused by faults of electric appliances and accidental electrification of a grounding wire. The leakage protection plug is provided with a weak current detection inductor, wherein a primary winding and a secondary winding of the weak current detection inductor are insulated from each other and coiled on an iron core of the weak current detection inductor; a detection circuit formed by connecting the primary winding and a current limiting and capacitance resisting element is connected between the ground wire and a neutral wire; second controllable silicon is arranged in a driving circuit of an electromagnetic coil; the output end of the secondary winding of the weak current detection inductor is connected in parallel with a trigger electrode and a negative electrode of the second controllable silicon respectively; a positive electrode and the negative electrode of the second controllable silicon are connected with a positive electrode and a negative electrode of the output end of a rectifying circuit respectively; and the output end of a secondary winding of a zero sequence current mutual inductor is connected in parallel with the input end of the driving circuit of the electromagnetic coil respectively.

The invention discloses an electric leakage protection device which is not only capable of preventing the accidents of electric shocks caused by faults of electrical appliances but also capable of preventing the accidents of electric shocks caused by accidental electrification of earth wires. The electric leakage protection device is provided with a first resistor-capacitor unit, an earth wire fault voltage detector and an induction ring; a detection coil of the earth wire fault voltage detector is wound on an iron core of the earth wire fault voltage detector; a detection circuit formed by the first resistor-capacitor unit and the detection coil of the earth wire fault voltage detector which are connected in series is connected between an earth wire and a null line; one end of the first resistor-capacitor unit is connected with the earth wire and the other end is connected with one end of the detection coil of the earth wire fault voltage detector; the other end of the detection coil of the earth wire fault voltage detector is connected with the null line; and the detection ring passes through a closed induction circuit formed by the earth wire fault voltage detector and a zero-sequence current transducer.

The invention discloses an electric leakage protection plug, which can prevent an electric shock accident caused by electrical faults and can prevent the electric shock accident caused by accidental electrification of a ground wire. The electric leakage protection plug is provided with a weak current detection sensor, wherein a primary winding and a secondary winding of the weak current detectionsensor are insulated and separated from each other and wound on an iron core of the weak current detection sensor; a detection loop which is formed by connecting the primary winding and a current-limiting capacitance resistance element in series is connected between the ground wire and a zero line; a second thyristor and a first amplification circuit are arranged in a driving circuit of an electromagnetic coil; output ends of the secondary winding of the weak current detection sensor are respectively connected with an input end of the first amplification circuit in parallel; an anode, a cathode and a trigger electrode of the second thyristor are respectively connected with positive and negative electrodes of the output end of a rectification circuit and the output end of the amplificationcircuit; and the output ends of the secondary winding of a zero-sequence current transformer are respectively connected with the input end of the driving circuit of the electromagnetic coil in parallel.

The invention discloses an electric leakage protection plug, which can prevent an electric shock accident caused by electrical faults and can prevent the electric shock accident caused by accidental electrification of a ground wire. The electric leakage protection plug is provided with a weak current detection sensor, wherein a primary winding and a secondary winding of the weak current detectionsensor are insulated and separated from each other and wound on an iron core of the weak current detection sensor; a detection loop which is formed by connecting the primary winding and a current-limiting capacitance resistance element in series is connected between the ground wire and a zero line; a second thyristor and a first amplification circuit are arranged in a driving circuit of an electromagnetic coil; output ends of the secondary winding of the weak current detection sensor are respectively connected with an input end of the first amplification circuit in parallel; an anode, a cathode and a trigger electrode of the second thyristor are respectively connected with positive and negative electrodes of the output end of a rectification circuit and the output end of the amplificationcircuit; and the output ends of the secondary winding of a zero-sequence current transformer are respectively connected with the input end of the driving circuit of the electromagnetic coil in parallel.

The invention discloses a leakage protecting apparatus, which not only can prevent electric-shock accidents caused by malfunctions of electric appliances, but also can prevent the electric-shock accidents caused by accidental electrification of a ground wire. A zero-sequence current mutual inductor of the leakage protecting device is also provided with a detection winding, the detection winding of the zero-sequence current mutual inductor is separated from a secondary winding of the zero-sequence current mutual inductor in an insulation way, a detection circuit which is formed by serially joining the detection winding of the zero-sequence current mutual inductor and a current-limiting resistance-capacitance element is arranged between a ground wire and a zero wire, one terminal and another terminal of an electromagnetic coil are respectively connected with the anode and the cathode of a controllable silicon, and one output end and another output end of a primary winding of the zero-sequence current mutual inductor are respectively connected with one input end and another input end of a driving circuit of the electromagnetic coil.

The invention relates to a tripping device of a high-voltage circuit-breaker. The tripping device of the high-voltage circuit-breaker comprises a button (1) installed on a panel, and an ejector cap (2) fixedly connected with a torsion bar (11) of the button (1), the ejector cap (2) is provided with an electromagnet (3) matched with the ejector cap (2), the ejector cap (2) corresponds to a core bar of the electromagnet (3), and the electromagnet (3) is provided with a tripping board (4) pushed by the electromagnet (3). As a series of technical measures are adopted, a guide board assembly and a push board are omitted, the structural design of the tripping board is simplified, and compared with a split type tripping device, the tripping device of the high-voltage circuit-breaker has the advantages of being compact in structure, small in occupied space and low in cost, thereby being small in switching-on bounce, reliable in tripping and the like.

The invention discloses a leakage protection device which can prevent electric shock accidents caused by faults of electric equipment and also can prevent the electric shock accidents caused by the fact that an earth wire is electrified accidently. The leakage protection device is also provided with a weak current detection sensor, a voltage comparator circuit and a one-way output circuit; an iron core of the weak current detection sensor is wound by a primary winding and a secondary winding; a detection circuit which is formed by serially connecting the primary winding with a current-limiting capacitance resistance element is connected between the earth wire and a neutral wire; a standard voltage obtained from a stable-voltage power supply is input into an input end of the voltage comparator circuit; an output end of the secondary winding of the weak current detection sensor and the other output end thereof are respectively connected with the other input end of the voltage comparatorcircuit and a cathode of the output end of a rectifying circuit; and the output end of the voltage comparator circuit is connected with a driving circuit of an electromagnetic coil through the one-way output circuit.

The invention relates to protection level adjustable tripping devices for a molded case circuit breaker. The tripping devices comprises tension springs, a sliding adjusting button, a supporting part, adjusting drawing bars, adjusting screws, nuts, sleeves, movable iron cores, magnetic coils, static iron cores, magnet yokes, bases, compression springs, tripping parts and tripping drawing bars. The ends of the tension springs are connected with the adjusting screws, and the other ends are connected with the adjusting drawing bar. The ends of the sliding adjusting buttons are connected with the adjusting drawing bar, and the other ends are snapped at corresponding positions of the supporting part. The movable iron cores are formed by threaded connection of the adjusting screws and the sleeves, the ends of the adjusting screws are connected with the tension springs, and the other ends are in threaded connection with the sleeves. The magnetic coils and the static iron cores are arranged in rectangular cavities formed by magnet yokes and the bases, and the static iron cores are fixed below the movable iron cores. According to the device, the structure is simple, tripping is reliable, the multi-current-level adjustable function is achieved, and the production efficiency and the verification efficiency are greatly improved.

The invention discloses a leakage protection plug which can prevent electric shock accidents caused by faults of electric appliances and accidental electrification of a grounding wire. The leakage protection plug is provided with a weak current detection inductor, wherein a primary winding and a secondary winding of the weak current detection inductor are insulated from each other and coiled on an iron core of the weak current detection inductor; a detection circuit formed by connecting the primary winding and a current limiting and capacitance resisting element is connected between the ground wire and a neutral wire; second controllable silicon is arranged in a driving circuit of an electromagnetic coil; the output end of the secondary winding of the weak current detection inductor is connected in parallel with a trigger electrode and a negative electrode of the second controllable silicon respectively; a positive electrode and the negative electrode of the second controllable silicon are connected with a positive electrode and a negative electrode of the output end of a rectifying circuit respectively; and the output end of a secondary winding of a zero sequence current mutual inductor is connected in parallel with the input end of the driving circuit of the electromagnetic coil respectively.