37results about How to "Shorten tripping time" patented technology

A pressure trip device for a circuit breaker comprises a plurality of single pole switching units, each unit corresponding to each electrical phase hermetically mounting movable contactors and fixed contactors in an insulated case in order to switch electrical circuits according to each phase, having arc gas exhaust port, and connected to one another by a shaft; a switching mechanism connected to one of the single pole switching units for contacting or separating the movable contactor of the connected single pole switching unit to / from the fixed contactor of the connected single pole switching unit; a trip bar connected to the switching mechanism for tripping the switching mechanism; a gas pressure shooter facing the trip bar, and perpendicularly movable between a position for rotating the trip bar by a pressurization and a position separated from the trip bar; and a protrusion wall portion having a pair of wall portions facing to each other and perpendicularly extending from at least one outer surface of each case of the single pole switching units, having one wall portion for connecting lower ends of the pair of wall portions to each other, and forming a gas pressure storing space for supporting the gas pressure shooter to be perpendicularly movable and connected to the arc gas exhaust port. Accordingly, the circuit breaker is tripped faster than the conventional one using a tripping process by mechanisms of multi-step.

The invention belongs to the technical field of electrical switches, and relates to a permanent magnetic mechanism capable of adjusting the switching on-off time and an adjusting method thereof. The permanent magnetic mechanism comprises a permanent magnetic mechanism, and an outer yoke, an upper yoke, a lower yoke, a moving core, a core back cover, a pull rod, a switching-off spring, a contact spring, an adjusting nut, a locking nut, an inner yoke, a coil, and a permanent magnet, all of which are arranged inside the permanent magnetic mechanism. The outer yoke is arranged at the outer side of the permanent magnetic mechanism, the upper yoke and the lower yoke are fixedly installed at the upper and lower ends of the outer yoke, the switching-off spring is arranged in a cavity formed by the moving core, the core back cover and the upper yoke, and the contact spring is arranged between the lower end of a stepped circle at the upper end of the pull rod and the core back cover. By adopting the permanent magnetic mechanism of the invention, the switching on-off time can be adjusted, the time of tripping protection can be effectively shortened, and the quickness of line quick-break protection is ensured. The permanent magnetic mechanism and the adjusting method are especially suitable for a circuit break of which both the switching-off spring and the contact spring participate in the switching-on / off process and which is equipped with multiple permanent magnetic mechanisms, and are applicable to the field of electric power.

The invention belongs to the technical field of electric power systems, and in particular relates to an accelerated tripping method for main transformer backup protection based on information shared across intervals and applied to intelligent substations. The invention adds an acceleration trip logic to the backup protection function of the medium / low voltage side of the main transformer, and the backup protection of the middle and low voltage side of the main transformer uses the shared information across the interval to realize the acceleration judgment. The invention sends the position information of the bus tie section circuit breaker into the main transformer protection, and realizes the accelerated tripping of the circuit breakers on all sides of the main transformer under the condition of the bus tie sub-position or the bus tie charging, thereby shortening the tripping time and improving the protection. Significant advantages such as quickness and improved protection performance.

Systems and methods for controlling a rail vehicle are provided. In one embodiment, a rail vehicle system includes a first version of a travel database including travel information, a communication link to receive a second version of the travel database, and a controller configured to, in response to the second version of the travel database including changes to the travel information that meet predefined override criteria, control operation of the rail vehicle system based on the first version of the travel database; and in response to the changes to the travel information not meeting the predefined override criteria, adjust operation of the rail vehicle system to operate based on the second version of the travel database.

A load center comprises a common instantaneous tripping unit that works on a principle of solid state switching. The load center further comprises a plurality of branches of branch circuit breakers each of which is coupled to the common instantaneous tripping unit via a corresponding high power connection and a corresponding low power connection such that the common instantaneous tripping unit feeds the plurality of branches at the same time. The common instantaneous tripping unit interrupts a short circuit fault in an interruption time which is significantly reduced thus reducing or eliminating chances for a personal injury during the short circuit fault.

The invention belongs to the technical field of electrical switches, and relates to a permanent magnetic mechanism capable of adjusting the switching on-off time and an adjusting method thereof. The permanent magnetic mechanism comprises a permanent magnetic mechanism, and an outer yoke, an upper yoke, a lower yoke, a moving core, a core back cover, a pull rod, a switching-off spring, a contact spring, an adjusting nut, a locking nut, an inner yoke, a coil, and a permanent magnet, all of which are arranged inside the permanent magnetic mechanism. The outer yoke is arranged at the outer side of the permanent magnetic mechanism, the upper yoke and the lower yoke are fixedly installed at the upper and lower ends of the outer yoke, the switching-off spring is arranged in a cavity formed by the moving core, the core back cover and the upper yoke, and the contact spring is arranged between the lower end of a stepped circle at the upper end of the pull rod and the core back cover. By adopting the permanent magnetic mechanism of the invention, the switching on-off time can be adjusted, the time of tripping protection can be effectively shortened, and the quickness of line quick-break protection is ensured. The permanent magnetic mechanism and the adjusting method are especially suitable for a circuit break of which both the switching-off spring and the contact spring participate in the switching-on / off process and which is equipped with multiple permanent magnetic mechanisms, and are applicable to the field of electric power.

The invention discloses an identification method of fault current in a starting process of an asynchronous motor. The method comprises the following steps: (1) carrying out high-speed digital sampling on voltage and current of the asynchronous motor and forming a sampling data sequence of representing voltage and current change processes; (2) reconstructing equivalent BH curves of an iron core and an air gap between a stator and a rotor of the asynchronous motor through combined application of voltage and current data of the asynchronous motor, and calculating the slopes of the ellipse long-axis directions of the equivalent BH curves; and (3) identifying the starting current and the fault current during a startup period according to the change of the slopes of the ellipse long-axis directions of the equivalent BH curves. According to the identification method, the starting current and the fault current in the starting process can be effectively identified; the fault identification sensitivity in the starting process is improved; and the action time is shortened.

The invention discloses a fast tripping device of an execution mechanism of a low-voltage circuit breaker. The fast tripping device comprises a power assisting plate, an energy storage spring, a push plate and a lock plate for locking the power assisting plate, wherein the push plate and the lock plate are rotationally arranged on a base; and when a control part of the low-voltage circuit breaker detects a fault signal, a tripping instruction is output to the execution mechanism, a flux transformer is electrified to act, a flux top rod extends outside and pushes the push plate to rotate, and the push plate drives the lock plate to rotate while rotating, the power assisting plate is unlocked after the lock plate rotates, and the power assisting plate quickly moves under the tension action of the energy storage spring, so that the push plate carries out accelerated movement and drives the circuit breaker to fast open and trip. According to the fast tripping device disclosed by the invention, the movement speed of the push plate of the execution mechanism can be increased, so that the tripping time of the circuit breaker is shortened, the breaking capacity of the circuit breaker is improved, the tripping time is shortened by 20% in comparison with that in the prior art, and the tripping efficiency is greatly improved.