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Exploring coil arrangement method simultaneously reflecting electric generator stator and rotor internal short circuits

A generator stator and detection coil technology, applied in electromechanical devices, electrical components, electric components, etc., can solve problems such as lack of

Active Publication Date: 2013-02-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the volume and weight of the current transformer, many generators do not have the conditions to design and install the stator branch (group) current transformer, such as the common 1-pair pole steam turbine generator and marine generator, etc.

Method used

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  • Exploring coil arrangement method simultaneously reflecting electric generator stator and rotor internal short circuits
  • Exploring coil arrangement method simultaneously reflecting electric generator stator and rotor internal short circuits
  • Exploring coil arrangement method simultaneously reflecting electric generator stator and rotor internal short circuits

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Experimental program
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Effect test

Embodiment Construction

[0040] The following will calculate and analyze the inter-turn short circuit inside the stator and rotor when three typical synchronous generators are running under load. Table 1 is a 36-slot, 5-pole synchronous generator's stator A-phase winding connection table.

[0041] Table 1 A-phase winding connection table of a 36-slot, 5-pole synchronous generator (machine end→neutral point, forward direction)

[0042]

[0043] The number of slots per pole and phase of this motor is q=6 / 5, the number of unit motors is t=1, and the number of forward and reverse winding coils per phase is 6, so option 1: the distance between the two groups is 5π electrical angle The short-distance coils are forward connected in series to form a detection coil. During the calculation, the detection coil (the pitch is taken as 3 slots) is arranged at the position of the 1st slot and the 19th slot, and the two are forward connected in series. Through simulation, it is found that when the generator is r...

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Abstract

The invention relates to an exploring coil arrangement method simultaneously reflecting electric generator stator and rotor internal short circuits, which belongs to the technical field of relay protection and online monitoring of a power system main device and is characterized in that the arrangement scheme of an exploring coil is determined in accordance with a certain principle according to a stator winding form of an electric generator, and the protection and the monitoring of faults are realized through analyzing the harmonic characteristics of the induced electromotive force of the exploring coil. The computation and the analysis on stator and rotor internal short circuits generated when three typical synchronous electric generators operate on load show that the method provided by the invention can flexibly reflect normal operation, the stator internal short circuit and the rotor internal short circuit. The method can be applied to effectively protect and monitor stator and rotor internal short circuit faults of the synchronous generators.

Description

technical field [0001] The invention belongs to the technical field of relay protection and on-line monitoring of main equipment in a power system, and in particular relates to a method for arranging detection coils capable of simultaneously reflecting internal short-circuit faults of a generator stator and a rotor. Background technique [0002] The internal short circuit of the synchronous generator stator is a common and highly destructive fault. When the fault occurs, the huge short circuit current will cause the winding to overheat, burn the winding and the iron core, and may generate destructive electromagnetic force; if it is not handled in time, the fault will occur The negative sequence magnetic field may also cause serious damage to the rotor core. The internal short circuit of the rotor is also a relatively common electrical fault of the synchronous generator. A slight short circuit will not have a serious impact on the operation of the generator, but if the fault ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K11/00H02K11/20
Inventor 孙宇光郝亮亮桂林王祥珩
Owner TSINGHUA UNIV