35results about How to "Avoid phase-to-phase short circuits" patented technology

The invention relates to the technical field of cable maintenance equipment, and particularly relates to a cable terminal insulated fixing device. The cable terminal insulated fixing device is characterized by comprising a supporting part and a fixing part, wherein the supporting part is connected with the fixing part through a connecting rod, the connecting rod is provided with an adjusting mechanism, the fixing part comprises a plurality of fixing rods and adjustable buckles, the adjustable buckles are arranged at end parts of the fixing rods, and the plurality of adjustable buckles are arranged at intervals. The cable terminal insulated fixing device has the advantages of reliable fixation and safe use.

This invention relates to a rapid automatic change-over including two AC contactors connected by a mechanical interlocking piece, one is connected with the major supply, the other with the standby supply. It also includes an intermediate relay and two self-locking buttons, the operation coil of the relay is parallel to that of the AC contactor connected with the major supply then to connect with the major supply by a self-locking button, the operation coil of the AC contactor linked with the standby supply is serial with the normally-closed contact of the relay then to be connected with standby supply by the other self-locking button, which can avoid providing power at the same time by two supplies and generating short circuit.

The invention relates to a commutation timing determination method and a commutation system for three-phase unbalanced commutation, including: converting a multi-objective optimization problem into a single-objective optimization model through a constraint method, combining genetic algorithm and simulated annealing algorithm to obtain The optimal solution set of the single-objective optimization model is determined, and the best solution in the optimal solution set is determined as the commutation timing, and based on the commutation timing, the load to be switched and its switching sequence are determined for switching. The invention transforms multiple objectives into one objective, improves calculation efficiency, and controls the number of current optimal solutions generated by adjusting breakpoints of constraint conditions, thus having strong objectivity. Secondly, the combination of genetic algorithm and simulated annealing algorithm helps to quickly and accurately obtain the global optimal solution, effectively avoid the safety risks caused by three-phase imbalance, and improve the level of power grid operation planning. In addition, the present invention can analyze the three-phase unbalanced state of transformers of different types and capacities, and has a wide range of applications.

The invention discloses a capacitive type isolated bus with two shielded ends, aiming at solving the problems of complicate process and high manufacturing cost of the high-voltage capacitive type isolated bus in the prior art. The capacitive type isolated bus with two shielded ends, provided by the invention, mainly comprises a current guiding body, rigid isolated barrels, fixed flanges and capacitive type isolators, and is characterized in that the current guiding body is arranged at a central position and two ends of the current guiding body are respectively provided with a plugging terminal with a plugging slot; the plugging terminals at two ends of the current guiding body are respectively and fixedly connected with one rigid isolated barrel; the other terminal of each rigid isolated barrel is respectively fixed on one fixed flange; the capacitive type isolators are wrapped outside the rigid isolated barrels and the current guiding body by using organic isolated tapes; and an innermost screen of a capacitive screen of each capacitive type isolator is equipotential to the current guiding body and an outermost screen of the capacitive screen of each capacitive type isolator is reliably grounded through the corresponding fixed flange. By adopting the capacitive type isolated bus with two shielded ends, provided by the invention, an isolated shielding type intermediate connector is not needed, the capacitive type isolated bus has the advantages of simple structure, low manufacturing cost and mounting convenience, is subjected to isolated shielding in a whole course, and can be detected at a factory; and the current guiding body is connected in a plugging manner so that the bus is regulated freely in a manner of expanding under heating and contracting under cooling.

The invention discloses a washing machine, a motor for the washing machine and a stator assembly thereof. The stator assembly comprises a stator core, a stator winding, multiple pieces of insulating slot papers and at least one insulating plug-in, wherein the stator core is provided with multiple stator teeth and multiple stator slots, the multiple stator teeth are arranged at intervals along thecircumferential direction of the stator core, and the stator slots are defined between two adjacent stator teeth; the stator winding is wound on the multiple stator teeth; the multiple pieces of insulating slot paper are arranged in the multiple stator slots in a one-to-one correspondence manner, and each piece of the insulating slot paper is located between the stator tooth and the stator winding; and the at least one insulating plug-in is arranged at an opening of the stator slot and used for closing at least part of the opening, the side, which faces towards the stator tooth, of the insulating plug-in is provided with a groove, and a part of the insulating slot paper is arranged between the stator tooth and the insulating plug-in and located in the groove. The stator assembly of the motor for the washing machine in the embodiment of the invention avoids wind noise generated by the rotation of a motor rotor, improves the safety performance, and is simple in structure, convenient to manufacture and good in user experience.

The invention discloses an insulation frame, a stator assembly, a motor and a washing machine of a motor for a washing machine. The insulation frame comprises a first insulation skeleton, wherein thefirst insulation skeleton is adapted to be installed on one shaft end of a stator iron core of the motor; a second insulation skeleton which is adapted to be installed on one shaft end of the stator iron core of the stator; a third insulating connection frame through which the first insulation skeleton and the second insulation skeleton are connected, wherein, the third insulating connection framecomprises a plurality of insulating inserted rods arranged in an annular shape and spaced apart, each of the insulating inserted rods is adapted to be inserted at a slot of a stator slot of the stator core. The insulation frame of the motor for a washing machine according to the embodiment of the invention avoids the wind noise generated by the rotation of the motor rotor, improves the safety performance, has a simple structure, is convenient to install, and has good user experience.

The invention is a dynamic processing method for a single-phase transition resistance grounding fault in a distribution network. When the neutral point displacement voltage of the power grid is abnormal, firstly compare the magnitude of the neutral point displacement voltage of the power grid, and if it is, it is judged as a low-resistance grounding fault. The phase voltage ratio method can be used to determine the ground fault phase, and the current of the fault point can be transferred by closing the ground switch of the fault phase to ground. At that time, it was a high-impedance ground fault, and the phase voltage ratio method cannot be used to determine the ground fault phase, and the method of closing the ground switch of the fault phase to the ground cannot be used to deal with single-phase ground faults, but directly enters the line selection process, and real-time Detect the displacement voltage of the neutral point of the distribution network, track the development of the fault, and carry out dynamic processing of the fault; once the fault develops, immediately use the phase voltage ratio method to determine the phase selection method of the ground fault, and start the fault current transfer device to transfer the fault current to the ground phase. The grounding switch is closed to the ground to divert the current at the fault point and deal with the single-phase grounding fault of the distribution network.

The invention discloses a three-phase magnetic latching relay whose input and output are symmetrically distributed. Its structure includes three parts, namely a housing part, a control circuit part and a magnetic circuit system part. The housing part consists of a casing and an upper cover. , lower cover; the control circuit part includes L1 control group circuit, L2 control group circuit, L3 control group circuit, mutual inductor, each group of control circuit consists of moving contact, moving spring seat, moving reed, static contact , Static spring seat; the magnetic circuit system part includes a coil frame, a bracket, a push piece, a magnetic steel component, an enameled wire, an iron core, and a yoke. It is inconvenient to connect the traditional spaced three-phase electric meter connection terminal if the new electric meter design scheme is adopted; but the present invention adopts the symmetrical three-phase electric meter connection terminal, and adopts the new electric meter to match the symmetrical three-phase magnetic latching relay of the present invention Reasonable, convenient design, saving materials and greatly reducing costs.