A calculation method for real-time temperature rise of windings under repeated short-term short-circuit conditions

Abstract

The invention discloses a method for calculating the real-time temperature rise of windings under repeated short-circuit short-circuit conditions, constructing a 3D model of a full-scale equal-scale transformer; setting transformer parameters and simulating external circuits for repeated short-circuit short-circuit conditions; constructing a transformer finite element model, Set up the transient electromagnetic field module and calculate the transient loss of the transformer: set up the fluid mechanics module, set the fluid mechanics parameters and boundary conditions; couple the transient electromagnetic field module, the fluid mechanics module, and the temperature field module to solve the problem under repeated short-circuit conditions Winding real-time heating characteristics. Based on the finite element analysis method, the present invention calculates the real-time temperature rise of the winding of the transformer under repeated short-circuit short-circuit conditions through the coupling method of the transformer transient loss data under the transient electromagnetic field module and the fluid-temperature field multi-physics field, It solves the problem that it is difficult to calculate the temperature rise characteristics of the winding in real time when the transformer is in the dynamic fault state of the winding.

Description

technical field [0001] The invention relates to the technical field of transformer simulation, in particular to a method for calculating the real-time temperature rise of windings under repeated short-circuit conditions. Background technique [0002] In recent years, with the rapid development of the power industry, the system's requirements for electrical equipment have gradually increased. As the core equipment of the entire power system, the transformer is responsible for power conversion, isolation and voltage stabilization. The reliability of its operation directly affects the safety and stability of the entire system. If the transformer fails, it may cause large-scale power outages and cause huge economic losses. loss. [0003] Transformers are mainly composed of iron core, windings, clamps, structural parts and boxes. Usually, the types of faults that occur in transformers mainly include: transformer overload, winding short circuit, winding turn-to-turn short circuit...

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Problems solved by technology

[0006] The technical problem solved by the present invention is to provide a method for calculating the real-time temperature rise of windings under repeated short-circuit conditions, based on the finite element analysis method, through the transformer transient loss data and fluid-temperature field multi-physics under the transient electromagnetic field module The field dynamic coupling method does not use the transient electromagnetic field module to couple to the fixed steady-state loss of the thermodynamic temperature field module, but uses the transient field to calculate the transient loss of the transformer under repeated short-circuit time, and reflects the temperature cumulative effect of the winding to solve the repeated Under the short-term short-circuit condition, the loss dynamic transformation cannot be directly coupled, and the real-time calculation of the winding temperature rise is realized.

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