7results about How to "Avoid insulation damage" patented technology

The self-adaptive reclosing hybrid direct-current circuit breaker suitable for the direct-current power transmission and distribution system has a two-stage current limiting function and comprises a first-stage current limiting branch and a second-stage current limiting branch, the defect of a single fixed current limiting mechanism of an existing circuit breaker can be overcome by adopting two-stage current limiting, and when faults of different types and different severity occur, the current limiting mechanism can be changed, and the current limiting mechanism can be changed. The current change rate and the change range at the moment of a fault are large, the two-stage current limiting structure can preliminarily limit the rapid change of the fault current through the first-stage current limiting branch after the fault occurs, then the fault current is limited step by step through the two-stage current limiting structure, and the purpose of stably limiting the current is achieved. And energy impact and electromagnetic interference on other elements and equipment in the circuit caused by sudden, large and rapid change of the current are reduced. The structure of the fault discrimination branch circuit does not need to use a power supply to charge a capacitor C3, and only uses the inductance energy of a fault side line, thereby effectively avoiding the waste of energy.

The invention provides an anti-resonance device of an electromagnetic voltage transformer for a GIS (Gas Insulated Switchgear). The anti-resonance device comprises a sub-harmonic anti-resonance circuit, a fundamental harmonic anti-resonance circuit and a higher harmonic anti-resonance circuit, the anti-resonance circuits are connected in parallel and then are connected to the PT opening triangle side. According to the sub-harmonic anti-resonance circuit, when sub-harmonic resonance occurs in a system, a nonlinear saturable reactor reaches a saturated state, and flowing current causes instantaneous loss, so that generation of the sub-harmonic resonance is inhibited; the fundamental harmonic anti-resonance circuit generates an electric field when current passes through an inductive element, and charges of the electric field are accumulated in a capacitor; two ends of the mutual inductor are connected in parallel or in series with a capacitor to form an LC series resonance circuit; the capacitor destroys resonance conditions in a loop to suppress fundamental harmonic waves; according to the high-order harmonic anti-resonance circuit, when voltage rise and current increase are detected, a high-power resistor in a secondary circuit enables zero sequence voltage to be in short circuit, inductance generated by mutual inductor overload changes resonance conditions in the secondary circuit, and high-order harmonics are eliminated. And the safety of the system is improved.

Power cable polishing equipment comprises a polishing mechanism, a driving mechanism and a sensing control module. The polishing mechanism comprises a hinged tensioning structure and a polishing belt arranged on the hinged tensioning structure in a sleeving mode. The driving mechanism is connected to one end of the other side of the hinged tensioning structure and drives the polishing belt on the hinged tensioning structure to rotate. The sensing control module is installed on the side, close to the grinding belt, of the driving mechanism. The sensing control module is used for measuring the surface temperature of the polishing belt and controlling the rotating speed of the driving mechanism according to the measured surface temperature, so that the polishing frequency of the polishing belt is controlled; the sensing control module measures the temperature of the polishing mechanism or the power cable and controls the rotating frequency of the driving mechanism so as to adjust the polishing frequency of the polishing mechanism, polishing of the power cable is optimized, the power cable polishing equipment can be controlled based on the temperature, and damage to an insulating material caused by overheating is avoided.

This utility model discloses an integrated arc extinguishing and arc suppression device and a circuit breaker having the same, including an arc extinguishing chamber unit and an arc suppression chamber unit. The arc suppression chamber unit is integrally connected to the arc extinguishing chamber unit through a set of mounting side plates, and an extension baffle is formed by the set of mounting side plates extending towards the circuit breaker wiring port. The mounting side plates and the extension baffles are integrally formed to constitute the side walls of the arc extinguishing chamber unit and the arc suppression chamber unit, respectively. In this integrated structure, the ends of the extension baffles directly cover the inner walls on both sides of the wiring port, forming a continuous arc extinguishing cavity and an arc suppression cavity, completely eliminating the gaps caused by assembly, structurally blocking the path of arc escape, and improving the overall arc extinguishing and arc suppression efficiency. The integrated arc extinguishing chamber and arc suppression chamber structure significantly compresses redundant space, improves the internal layout compactness without increasing the overall volume of the circuit breaker, and significantly improves the cabinet space utilization rate.

The invention discloses an online monitoring method for GCB contact resistance of a large generator and a storage medium, wherein the method comprises: step S1, obtaining GCB real-time load current, SF6 gas cooler size parameters, SF6 gas cooler real-time temperature, SF6 gas temperature change and GCB real-time temperature; step S2, determining SF6 gas cooler heat dissipation according to SF6 gas cooler size parameters and SF6 gas cooler real-time temperature; calculating generator contact heat dissipation according to GCB real-time temperature; calculating gas heat absorption work according to SF6 gas temperature change; step S3, calculating contact resistance according to GCB real-time load current, SF6 gas cooler heat dissipation, generator contact heat dissipation and gas heat absorption work; the method helps to prevent insulation damage such as rapid expansion, leakage and explosion of SF6 gas caused by abnormal increase of contact resistance and overheating of GCB by real-time monitoring of GCB contact resistance, thereby avoiding safety incidents.

The invention discloses a high-voltage aerial cable supporting framework design method considering cable bending rigidity, and belongs to the field of high-voltage aerial cable supporting framework design. A high-voltage aerial cable supporting framework and a clamp at a cable bending position are designed based on the minimum allowable bending radius of a cable; an initial cable-high-voltage aerial cable supporting framework design scheme is formed; finite element simulation modeling analysis is carried out for a cable-high-voltage aerial cable supporting framework design scheme, and bending moment distribution at the cable bending position is solved; checking the bending safety of the cable, and if the safety is met, outputting a cable-high-voltage aerial cable supporting framework design scheme; and if the safety is not met, adjusting a high-voltage aerial cable supporting framework or / and a clamp at the bending part of the cable, and carrying out finite element simulation modeling analysis again. According to the method, it can be ensured that the cable cannot be excessively bent under various working conditions, terrible accidents caused by the too small bending radius are effectively avoided, and the operation safety of the cable body is remarkably improved.