An automatic switching transformer operation control method for suppressing excitation inrush current

Abstract

The invention belongs to the technical field of transformer equipment protection and operation control, and relates to a transformer operation control method with economical operation and automatic switching to suppress excitation inrush current, which can protect the operation of transformers in power transmission systems. The phase angle of the circuit breaker opening and closing voltage in the transportation system realizes the mutual cancellation of the bias magnetism and the residual magnetism, suppresses the no-load excitation inrush current of the transformer and realizes automatic switching, and adopts the feedback mechanism to increase the control accuracy and reliability of the power transportation system, so that the power The transportation system automatically tracks and adapts to the change of opening and closing time of the circuit breaker due to aging or environmental changes; its overall control process is scientific and reasonable, the technical route is simple, the hardware and software technology is mature, the operation is safe, the control performance is reliable, and the investment Less, low operating cost, easy to popularize and use.

Description

Technical field: [0001] The invention belongs to the technical field of transformer equipment protection and operation control, and relates to a transformer operation control method with economical operation, automatic switching and suppression of excitation inrush current, which can protect the operation of transformers in power transmission. Background technique: [0002] At present, the commonly used transformer backup protection measurement and control device, its protection functions mainly include three-stage fixed-time complex voltage lockout (direction) overcurrent protection, three-stage (direction) zero-sequence current protection, gap zero-sequence protection, zero-sequence voltage protection, Overload protection (on-load voltage regulation, ventilation start), composite voltage, PT disconnection alarm, liquid crystal display function and normal information and operation can be completed through keyboard and liquid crystal display, and remote control can be realize...

AI Technical Summary

Problems solved by technology

[0002] At present, the commonly used transformer backup protection measurement and control device, its protection functions mainly include three-stage fixed-time complex voltage lockout (direction) overcurrent protection, three-stage (direction) zero-sequence current protection, gap zero-sequence protection, zero-sequence voltage protection, Overload protection (on-load voltage regulation, ventilation start), composite voltage, PT disconnection alarm, liquid crystal display function and normal information and operation can be completed through keyboard and liquid crystal display, and remote control can be realized through field bus interface and automation system Communication, directly drive the tripping and closing coil of the circuit breaker through the outgoing pulse and realize the tripping and closing operation of the circuit breaker, with anti-jump circuit, control circuit breaker opening and closing function, and online setting of the outlet matrix; its main functions of measurement and control include 12 channels Remote signal opening and input collection, device remote signal displacement, accident remote signal; normal circuit breaker remote control opening and closing operation; remote measurement collection and calculation: P, Q, I (IA, IC, I2, Ia, Ib, Ic, I0, I0s), U (UA, UB, UC, UAB, UBC, UCA, U1, U2), U0, F, COSФ and other analog quantities; event SOE records; the existing technology does not have the ability to control the opening and closing of circuit breakers The ability to suppress the inrush current of no-load switching; at the same time, the automatic switching of the transformer cannot be performed based on the principle of transformer economic operation; Non-linear characteristics will generate a large amplitude excitation inrush current, which will lead to misoperation of the transformer differential protection, and at the same time cause winding deformation and reduce the life of the transformer; the excitation inrush current contains multiple harmonic components and DC components, which will reduce the power supply quality of the power system. At the same time, the high-order harmonics in the inrush current have a strong destructive effect on the sensi...

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