114results about How to "Reliable breaking" patented technology

The present invention relates to an electric power switch action time dynamic measurement method and application, and an electric power switch AC zero crossing point accurate control method and application. The electric power switch action time dynamic measurement method comprises the following steps of 1) before sending out a switching or cut-off action command to an electric power switch, applying a high-frequency carrier at the input side of the electric power switch as a detection signal source, at the same time, detecting the applied high-frequency carrier at the output side of the electric power switch; 2) sending out the switching or cut-off action command to the electric power switch, and calculating the switching or cut-off action time of the electric power switch by taking the time of sending out the switching or cut-off action command as the starting action time of the switch, and taking the time of starting detecting an applied high-frequency carrier signal at the output side of the electric power switch as the time of the switch of finishing the switching action, or taking the time when the applied high-frequency carrier signal is detected to lose at the output side of the electric power switch as the time of the switch of finishing the cut-off action. According to the method of the present invention, the switching action time of the electric power switch can be measured accurately.

A switching device which can be small-sized by improving a shielding performance and can improve the reliability of switching characteristics. A permanent magnet disposed near stationary contacts is arranged in its pole-face perpendicularly of the axis of a moving contact member.

A cell according to the present invention comprises a positive electrode, a negative electrode, an electrolyte solution, and an outer casing, wherein the outer casing comprises a valve plate 30 having a thickness, an annular-shaped break groove 4 formed on the valve plate, and one or more of break aiding grooves 1 in the inner area of the break groove, and wherein the break aiding groove comprises such configurations that remaining thickness of the valve plate at the break aiding groove is thicker than remaining thickness of the valve plate at the break groove, and at least one end of the break aiding groove is connected with the break groove. In a cell provided with a valve plate which is a safety valve 9 comprising the break groove and the break aiding groove, the safety valve operates smoothly and releases a gas inside the cell quickly, and resistance to dropping impact is improved.

The invention discloses a moulded case electromechanical integration three-phase AC motor protector, which is applicable to the protection of three-phase AC motors. Based on a moulded case circuit breaker or a moulded case leakage circuit breaker with a leakage protection function, the invention slightly changes the internal electric wiring, increases a special relay, a voltage loss release, three current detecting transformers and zero-sequence current transformers, and is provided with corresponding CPU and circuits outside the motor. The invention is suitable for the automatic breakdown of the three-phase AC motor in the situations of phase loss, electric leakage, overloading and rotor locking, reaching the function of motor protection and implementing the speciality and automation of the motor protection.

It is provided a support structure for a cooling unit for a vehicle, in which in one straight side edge portion of a rectangular cooling unit, a first support point and a second support point, which are set to be away from each other in a longitudinal direction of the one side edge portion, are supported by a first retention portion and a second retention portion, respectively, the first retention portion and the second retention portion being provided in a single support bracket fixed integrally to a vehicle body, the second retention portion supporting the second support point through a fragile portion that is broken to permit the second support point to be separated from the second retention portion when an external force equal to or larger than a predetermined value is applied to the second support point in a direction toward a rear side of a vehicle; and when the fragile portion is broken, the second support point being permitted to move toward the rear side of the vehicle, and to pivot in a direction of an arc with a center at the first support point.

A device for breaking DC currents exceeding 2500 A has a resonance circuit connected in parallel with an interrupter and a surge arrester connected in parallel with the resonance circuit. The resonance circuit has a series connection of a capacitor and an inductance. The relationship of the capacitance in μF to the inductance in μH of the resonance circuit is ≧1.

For an automobile there is provided a fire extinguisher which is rapidly activatable in combination with a device for cutting a seatbelt and a device for breaking open a windshield.

A crop feeding apparatus having a roller through which the fingers are extended and retracted, has fingers that are formed with tubular finger bodies extending between an inner end configured to be mounted on a finger drive arrangement of the crop feeding apparatus and an outer end of the finger body configured to protrude from the outer peripheral wall of the roller. A breakaway region is formed in the finger body by diametrically opposed slots which are circumferentially elongated to define a shear plane perpendicular to the long axis of the finger body. A slot axis extending between opposing ends of each slot is parallel to the axis of the crop feeding apparatus. The finger body is also hardened by heat treating, and by applying a wear resistant coating over the heat treated body.

An inverted-code generator 41 inverts the PN code sequence into an inverted code sequence. The inverted code sequence is transmitted. The inverted code sequence, which is transmitted as a communication breaking wave, is formed into a code sequence in the form if inversion of a pilot signal conforming to CDMA system. Moreover, the phase of the inverted code sequence has been advanced. Therefore, the pilot signal, which is being propagated, can appropriately be compensated with the advanced inverted code sequence. Thus, a fact can be recognized by a portable telephone that the portable telephone is deviated from a communication area for the base station.

The invention discloses a novel single-fracture single-cylinder self energy high pressure sulfur hexafluoride breaker arc extinguish chamber, comprising a static contact mechanism and a moving contact mechanism which are used in a matching way, a moving contact seat and an insulating tension pipe driving the moving contact mechanism to carry out on and off operations up and down; wherein the moving contact mechanism is axially arranged in the cylinder and is driven by the cylinder to carry out on and off operations, the static contact mechanism, the moving contact mechanism and the moving contact seat are axially arranged in an arc extinguish ceramic sleeve from up to down, the inner diameter of the cylinder is 40-50% less than that of a compressed air SF6 breaker cylinder, and the cylinder is a pneumatic cylinder with residual capacity in the interior after off operation of the moving contact mechanism. The invention has reasonable structure design, simple use operation and good use effect, and can realize triplex functions of the cylinder being used as a compressed air chamber and a thermal expansion chamber and remaining reasonable residual capacity, so that the self energy sulfur hexafluoride breaker can utilize electric arc energy to help extinguish the electric arc when in heavy cut-off current, thus greatly reducing operation power.

The invention discloses an iron core reactance regulator with the current control and short-circuit current-limiting functions and a control method thereof. The iron core reactance regulator comprises six square-shaped iron cores, direct current coils and alternating current coils. Each square-shaped iron core comprises a middle column, a side column, an upper magnet yoke and a lower magnet yoke, the six middle columns are combined to form a combined middle column, and the distance between the combined column and each side column adjacent to the combined column is equal. The direct current coils wind the combined middle column and are connected with an adjustable bias direct current source. The alternating current coils wind the side columns, and dotted terminals of the two alternating current coils on the opposite side columns are connected into a whole to be connected to a power grid. Air gaps are formed in the square-shaped iron cores. The control method comprises that when the power grid operates stably, the current value of the adjustable bias direct current source is adjusted to the command value; when the short circuit occurs and the short-circuit current is larger than the stable working current, the output current of the adjustable bias direct current source is lowered to the zero. The iron core reactance regulator is simple in structure, easy to achieve, low in cost and high in reliability.

The invention discloses a direct-current electric automobile power battery protection device and a work method thereof. The direct-current electric automobile power battery protection device includesfour branch circuits arranged on an electric automobile power battery main closed circuit, wherein the first branch circuit is alone composed of a power electronic switch, the second branch circuit isalone composed of a direct-current fuse protector, the third branch circuit and the fourth branch circuit are each alone composed of a direct-current mechanical switch, and the first and third branchcircuits are connected in parallel and then are in series connection with the second and fourth branch circuits which are connected in parallel; a control closed circuit of the device is provided with a current detection and control module for detecting the current state of the main closed circuit and controlling all the switches to be switched on and switched off so that different switch-on andswitch-off logic can be achieved. By adopting the device, the main closed circuit load current is on and off flows through the direct-current mechanical switches, the main closed circuit rated load current and overload current is off through when the power electronic switch, and the main closed circuit short-circuit current is off through the direct-current fuse protector; the switch-on and switch-off advantages of all the switches within different fault current ranges are fully exerted, direct-current electric automobile fault current is reliably broken, and therefore the device can replace current protection strategies.

The invention discloses an optimal configuration method of breaker and fault current limiter in ring network type DC micro-grid. The ring network type DC micro-grid change condition after the short-circuit fault is sufficiently considered and analyzed, and a method for accurately and quickly obtaining the fault DC micro-grid network voltage and the branch current is provided. By adopting the NSGA-II algorithm with fast operation speed and good solution set convergence is adopted and improved to perform the optimal configuration analysis of the breaker and the fault current limiter, and the practicability is strong. The two economic indexes of the breaking capacity of the breaker and the inductive value of the fault current limiter are used as the target function, and the reliability indexcapable of reliably breaking the branch is used as a constraint condition, and the obtained optimal configuration scheme has good economy and reliability at the same time.

The invention discloses a medium voltage DC vacuum circuit breaker main circuit topology, which comprises a main current path formed by serial connection of vacuum circuit breakers VB1 and VB2, a commutation breaking circuit formed by serial connection of a commutation capacitor C, an auxiliary switch S and a commutation inductor L, an auxiliary breaking circuit formed by serial connection of an auxiliary inductor La and an auxiliary capacitor Ca and an energy absorbing circuit formed by a varistor RV, wherein the main current path, the commutation breaking circuit and the energy absorbing circuit are connected in parallel; and the auxiliary breaking circuit and the vacuum circuit breaker VB1 are connected in parallel. The invention also discloses a commutation breaking method. In the caseof small current of a breaking DC system load, the vacuum circuit breakers VB1 and VB2 operate in sequence; and in the case of high current of fault of the breaking DC system, the vacuum circuit breakers VB1 and VB2 operate simultaneously. The medium voltage DC vacuum circuit breaker main circuit topology and the breaking method thereof have the characteristics of a reliable high current breakingprocess, quick small current breaking process and the like, and are suitable for a medium voltage DC high current system, and certain advantages are achieved in aspects of the device shape, the volume and the cost.

The invention provides a current supplying component of a current protection device. The current supplying component comprises a power supply module and a low-voltage high current module. The power supply module supplies electricity for the low-voltage high current module; the low-voltage high current module comprises a low-voltage voltage limiting unit and a relay unit; loads of a tripping mechanism in the protection device are connected in parallel to two ends of the low-voltage voltage limiting unit; a protection triggering signal is responded, the relay unit conducts an access of the low-voltage voltage limiting unit, thus high current under low voltage is provided for the loads of the tripping mechanism; and the current supplying component can meet the small volume requirement of the protection device, the material cost of the protection device is reduced, and meanwhile low voltage and high current can be provided for the loads.

The invention discloses a protection device for a three phase AC motor of mechanical and electronic integration with a plastic shell and an energy-storing percussive device, which is applicable to the protection of the three phase AC motor. The invention have a slight change on internal electric connection wires on the basis of a breaker with a plastic shell or a creepage breaker with a plastic shell having creepage protection function (also called residual current protection device). Furthermore, the invention increases a special delayer, a voltage loss releasing device, an energy-storing percussive device, three current detection transformers and a zero sequence current transformer, as well as allocates a corresponding central processing unit (CPU) and a relative circuit outside the device. The invention is applicable to automatic power-off in the case of phase-lacking, creepage, overload and locked-rotor of the three phase AC motor to the reach the function of protecting the motor and realize the specialization and automation of motor protection.