System and method for simulating internal fault of electric generator

Abstract

The invention relates to the field of analogue simulation of a power system, in particular to a system and a method for simulating the internal fault of an electric generator. A stator and a rotor tap of the electric generator are guided into a patch board of a fault simulation screen, and the position and fault mode of the internal fault are determined through six fault position switches. The connection between the fault position switch and a winding tap can be adjusted flexibly so as to meet the requirement of a fault simulation test. The internal fault simulation of the electric generator and external fault simulations of a generator terminal and the like share a set of phase-selecting switch and fault switch, and are switched through a shift switch KD. The system of the invention can simulate end fault of the electric generator, neutral point side fault and external fault of a protected zone. The internal fault simulation and the external fault simulation of the electric generator share the set of phase-selecting switch and fault switch, which form a fault simulation system of the electric generator together so as to provide a test platform with complete functions for researching the characteristic of the internal fault of the electric generator.

Description

technical field [0001] The invention relates to the field of power system simulation, in particular to a generator internal fault simulation system and a method thereof. Background technique [0002] Large-scale generators play a dominant role in the production of electric energy in the power system, and their safe and reliable operation is an important condition for ensuring that the power grid provides high-quality electric energy to the entire society. Since the internal fault of the generator is very destructive, in order to reduce its damage and ensure the safe operation of the generator, it is necessary to improve the protection ability of the internal fault of the generator. [0003] There is relative movement between the stator and rotor of the generator, which makes the inductance parameters of the motor circuit mostly time-varying. The magnetic circuit of the motor is composed of iron core and air gap, etc., and the windings are mostly distributed, which makes its ...

AI Technical Summary

Problems solved by technology

The sensitivity coefficient of the phase-to-phase short-circuit protection inside the generator cannot be simply determined by the phase-to-phase short-circuit current at the generator end

In addition, due to the short-circuit fault outside the generator, there will be no transverse differential current in theory, so if there is no generator internal fault simulation system, there is no way to protect the internal fault transverse differential, such as single element transverse differential, split phase transverse differential, etc. The sensitivity of the protection is analyzed and checked

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