30results about How to "Avoid insulation damage" patented technology

The present invention aims to disclose a variable-speed pumped storage generator motor rotor winding end socket insulating box fixing structure. The fixing structure is composed of a connected insulating box, fixing screws, a fixing rack, an insulating block and fixing nuts, the connected insulating box is made of a high strength insulating material, three cavities are in fan-shaped arrangement, and each cavity corresponds to a rotor winding end socket. A groove is arranged between the adjacent cavities, and the corresponding fixing screw penetrates the groove. Each fixing screw is made of a non-magnetic material and is a U-shaped structure, the insulating material wraps the outer side of the fixing screw, and the fixing screw cooperates with the insulating block and the corresponding fixing nuts to penetrate the groove of the connected insulating box and is fixed on the fixing rack at the inner side of a generator motor rotor winding. The structure solves the fixing and insulation technical problems of the generator motor rotor winding end sockets, at the same time, can adapt to the axial extension of the generator motor rotor winding caused by the temperature rise.

A stator of a three-phase driving type rotary electric machine has phase coils wound around teeth of a stator core. In a specific slot among a plurality of slots of the stator core in which one phase coil directly connected to a power terminal and another phase coil directly connected to a neutral point are adjacently disposed, an inter-phase distance ensuring member is disposed in a gap via which the two phase coils are adjacent, and a temperature sensor is inserted into an insertion hole provided in the inter-phase distance ensuring member.

The invention discloses a tightly-coupled split reactor parallel breaking scheme-based overvoltage suppression method, which is suitable for a first topological structure of a generator circuit breaker and a second topological structure of the generator circuit breaker. Firstly, an overvoltage mathematical expression and a maximum overvoltage multiple between two arms of a reactor under the condition that fractures are not simultaneously broken are provided for a specific topological structure; overvoltage suppression measures are taken on the two arms of the tightly-coupled split reactor through a resistance-capacitance protection device on the basis of a theoretical calculation result; a resistance-capacitance parameter value calculation method is provided; and the resistance-capacitance protection device comprises a vacuum contactor K, a protection resistor and a protection capacitor. The tightly-coupled split reactor parallel breaking scheme-based overvoltage suppression method has the beneficial effects that an insulation test for the reactor on the basis of the tightly-coupled split reactor parallel breaking scheme can be analyzed and corresponding protection measures are formulated; and the insulation damage to the two arms of the reactor caused by overvoltage when the circuit breaker is not simultaneously broken is avoided.

The invention discloses a high-current direct current power transmission line insulating structure. The insulating structure comprises an upper part supporting piece, a lower part supporting piece, an insulating thin film, a bolt kit, epoxy resin insulating gasket upper layers, epoxy resin insulating gasket lower layers, a PVC sleeve and a bottom supporting steel plate, wherein clamping grooves used in a matched manner are formed in the bottom of the upper part supporting piece and the top of the lower part supporting piece respectively; an insulating thin film layer is arranged on the inner wall in each clamping groove; a power transmission line passes through the clamping grooves to be fixed; bolt holes are formed in the upper part supporting piece and the lower part supporting piece respectively; the PVC sleeve passes through the bolt holes; the bolt kit passes through the PVC sleeve to fix the upper part supporting piece and the lower part supporting piece; and therefore, the operation reliability of the power transmission line is improved, the maintenance workload is reduced, the maintenance cost is greatly lowered, and high economic benefit is achieved.

The invention relates to a method for puncturing an iron core by a motor wire-insertion preventing winding, which is technically characterized in that: tips around the opening of wire-insertion grooves at two end faces of the iron core are firstly shaped into rounded corners R and an insulating end plate is then bonded when stators and rotors and magnetic pole iron core of the motor are manufactured; and the winding is led out of the opening of the end plate of the iron core with a particular linear section away from the end plate when the wire insertion for stator assembly and magnetic pole assembly is implemented so as to lower the possibility of causing the opening of the insulating end plate to deformation; the method according to the invention can effectively avoid the insulating damage of the winding after the wire insertion of the motor winding and guarantee the processing quality and the reliability of stator, rotor assemblies of the motor. Such technique is simple and economical in operation, easy for popularization and application, capable of bringing a great many economic and social benefits and suitable for the manufacturing of insertion winding assemblies, such as rotor assembly and stator assembly of the motor with the insulating end plate, etc.

The invention belongs to the technical field of oilfield production, and discloses a cooling device for a downhole submersible motor, which comprises a water injection pump, a pump suction port, a cooling pump, a sealing joint, a protector and a motor connected in turn from top to bottom. At that same time, the motor drive the water injection pump and the cool pump, the water injection pump and the cooling pump share a pump suction port, the water injection pump discharge direction is upward, and the cooling pump discharge direction is downward; The sealing joint is connected with the coolingpump and the protector; A flow guide tube is symmetrically connected on both sides of the sealing joint, the upper end of the flow guide tube is communicated with the inner annulus of the sealing joint, and the lower end of the flow guide tube extends to the lower part of the motor. A low-temperature liquid in an annulus is extract by a cooling pump and pressurized, A liquid flow is for on that surface of the motor through the sealing joint and the flow guide pipe, thereby continuously radiate heat for the motor, avoiding insulation damage caused by excessive temperature of the motor, enablingthe motor to be normally use in the annulus with the sealed bottom, and prolonging the service life of the product.

A method for inspecting a spark plug and a method for manufacturing a spark plug, capable of more reliably distinguishing flashover and breakdown discharge during the inspection of the insulation performance of an insulator, and improving the yield. The spark plug (1) has: an insulator (2) having a shaft hole extending in the direction of the axis (CL1); a center electrode (5) inserted through the front end side of the shaft hole (4); and a body fitting (3) being Arranged on the outer periphery of the insulator, the spark plug has an annular space (29) opened on the front end side formed by the outer peripheral surface of the insulator and the inner peripheral surface of the metallic shell. The spark plug checks the insulation performance of the insulator based on whether the insulator is electrically damaged when a voltage is applied to the center electrode. During the inspection, when a voltage is applied to the center electrode, the range including at least the center electrode, the insulator, and the annular space is photographed from the front end side in the axial direction, and the presence or absence of electrical damage is judged from the obtained photographed image.

The invention discloses resonance voltage resistant test system and voltage resistant test method of a sample with large capacitance. A series compensation electric reactor group is dispersively distributed to form a mixed series and parallel connection structure so as to trend to a distribution parameter. The invention overcomes the defect of concentrated distribution of compensating inductancesin the conventional series resonance voltage resistant method, enables a frequency converting power supply and a boosting transformer to just provide less power consumption, greatly improves the loading capacity of a frequency converting resonance voltage resistant device, realizes the scene alternating current voltage resistance of large and superlarge GISs, a long-distance power transmission high-voltage cable and a constant voltage transformer CVT with extremely high requirement on frequency, and can effectively prevent the capacitance improving effect caused by large capacitance and insulation damage caused by boosting of voltage between a tested sample clamping space and the tail end, and the more and more dispersive the compensation electric reactor group is, the better the effect is.

The invention relates to an all-around current electrical fire alarm monitor of a 400V low-voltage distribution network, comprising air switches arranged on A, B and C phase lines and a current transformer arranged on each phase line in sequence; a residual current transformer is arranged on the A, the B, the C and an N phase lines together; residual current and the A, the B, the C and the N phase lines are respectively connected with a current detector; arc light impact current can be generated by the electric discharge phenomena between fire wires and between a fire wire and a zero line andthe electric discharge phenomenon due to poor contact of the same phase; and the phenomena can be monitored by monitoring the three-phase current incremental quantity. The invention has the benefits of overcoming the defects that electric arc can be caused by discharge due to the insulated damage between wires (including between phases and between the fire wire and the zero line) and poor field wiring contact and cannot be detected by the residual current detector.

The invention provides a fault detection device, method and system for a filter of a generator set, the device includes: at least one fault detection circuit, at least one fault detection circuit is coupled with the filter circuit of the filter; each fault detection circuit The circuit includes: a detection circuit and a signal processing module; a detection circuit for detecting the current signal flowing through the filter circuit and sending the current signal to the signal processing module; a signal processing module for detecting that the current signal is an AC switch current signal In the case of , output the first signal indicating that the filter circuit is in the open state to the converter in the generator set, and output the second signal indicating that the filter circuit is in the open state to the converter when the current signal is detected to be zero . The embodiment of the present invention can realize the real-time detection of the working state of the filter of the generator set, real-time protection and timely maintenance of the generator and the converter of the generator set.