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Optimized method of main protective configuration for internal fault of largesize motor stator coil

A technology for generator stators and internal faults, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as high cost and inability to complete design tasks satisfactorily

Active Publication Date: 2005-03-16
TSINGHUA UNIV
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Problems solved by technology

Therefore, the design of the main protection configuration scheme of the generator is a multi-objective engineering optimization design problem. The exhaustive method (combining the main protection schemes on the basis of comprehensive internal fault simulation calculations) not only costs too much , and cannot satisfactorily complete the design task

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  • Optimized method of main protective configuration for internal fault of largesize motor stator coil
  • Optimized method of main protective configuration for internal fault of largesize motor stator coil
  • Optimized method of main protective configuration for internal fault of largesize motor stator coil

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Embodiment Construction

[0205] Taking Three Gorges ABB generators and Longtan generators as examples, we will introduce how to optimize the generator main protection scheme on the basis of comprehensive internal short-circuit analysis and calculation.

[0206] Three Gorges ABB generator stand-alone 700MW, 80 poles, 540 stator slots, 5 branches per phase, 36 slots per branch. According to the analysis of the generator winding expansion diagram provided by the motor manufacturer, the internal short circuit that may actually occur in the stator winding of the generator is shown in Table 1 and Table 2.

[0207] Table 1 540 kinds of faults in the same tank of ABB generators in the Three Gorges

[0208] Short circuit with the same branch 420 kinds

[0209] Short circuit in different branches of the same phase Interphase short circuit

[0210] Number of short circuit turns 1 turn 3 turns 5 turns 7 turns

[0211] Number of failur...

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Abstract

The invention is an optimization method of main protection configuration of internal failure of a large-scale generator stator winding, advancing a multiloop analysis method of AC machine, considers an electric machine as a circuit network with relative movement to research its movement behavior by general circuit analysis methods, and can flexibly analyze the influence of various harmonic magnetic fields, space position and from of its winding, etc, thus solving the problem of simulation and calculation of the internal failure. On the basis of complete simulation and calculation of internal failure, the invention proposes that it should adopt a different design optimizing course according to different structures of generator winding, opens up a new way of scientifically making a solution of main protection configuration of a generator and reasonably selecting a led-out mode of neutral point-side branch and a solution of current mutual inductor configuration, corrects the previous wrong methods in the engineering, and provides a high- quality guarantee for safe operation of a large-scale generating set.

Description

technical field [0001] The invention belongs to the field of analysis and research on the asymmetry problem of AC motor windings and the relay protection technology of main equipment in power systems, and in particular relates to the simulation calculation of internal faults in stator windings of large generators and the optimization design of main protection configuration schemes. Background technique [0002] The internal fault of the stator winding of the synchronous motor is a common and highly destructive fault of the motor. When an internal fault occurs, a large short-circuit current will generate a destructive and serious electromagnetic force, and may also generate overheating, burning the winding and the iron core. The negative sequence magnetic field generated by the fault may greatly exceed the design allowable value, causing serious damage to the rotor. Therefore, it is of great significance to study the internal faults of the stator windings of synchronous moto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/06
Inventor 王祥珩桂林王维俭孙宇光王善铭毕大强
Owner TSINGHUA UNIV
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