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A method for judging whether a three-phase alternator winding lacks a parallel branch

A three-phase AC and generator technology, applied in the direction of motor generator test, measurement of electricity, measurement of electrical variables, etc., can solve the problems of lack of parallel branches and inability of generators to be used by users.

Active Publication Date: 2016-09-14
CSR CHENGDU
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  • Abstract
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  • Application Information

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Problems solved by technology

Therefore, according to the existing measurement method, even if the actual measured line resistance value of the generator winding meets the requirements of "standard resistance value or typical resistance value * (1±5%)", the generator may also have the phenomenon of missing parallel branches , so that the generators on the missing parallel branch cannot be handed over to the user

Method used

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  • A method for judging whether a three-phase alternator winding lacks a parallel branch

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Embodiment

[0022] Each phase in the windings of the three-phase alternator involved in this method includes a phase lead wire, a phase confluence ring, and a d(d> =2) Phase windings composed of parallel branches, each parallel branch consists of b (b> =1) A series of coils (when b=1, there is no such thing as a series connection), the three phases meet through the N-phase bus loop, such as figure 1 Shown. This judgment method includes the following steps:

[0023] (1) The surface temperature of the phase winding and its iron core and the ambient temperature t actual n Under the condition that the difference does not exceed 4℃, measure and count the actual cold wire resistance R of at least 4 qualified motor windings Actual line resistance n And corresponding ambient temperature t actual n , Where n is the n-th motor winding under test, n=1, 2, 3, 4...;

[0024] (2) Use the formula R Calculate line resistance n =R Actual line resistance n ×(235+t Specified temperature ) / (235+t actual n ) ...

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Abstract

The invention discloses a method for judging whether the winding of a three-phase alternating current generator lacks a parallel branch circuit. By testing and calculating the windings of a qualified three-phase alternating current generator set, the calculated line resistance and phase resistance at a specified temperature are obtained, and then calculated The line resistance and phase resistance in the absence of a parallel circuit are used to calculate the line resistance and the deviation range in the absence of a parallel circuit, which is used as a standard for other three-phase alternators to be tested. The method can conveniently and quickly judge whether the windings of the three-phase alternator are qualified, thereby effectively preventing the generator lacking parallel branches from being handed over as normal products.

Description

Technical field [0001] The invention relates to the technical field of generators, in particular to a method for judging whether a three-phase AC generator winding lacks parallel branches. Background technique [0002] For multi-phase alternators, the current standard requirement is to measure the wire resistance of the windings. The measured value should meet the requirements of "standard resistance value or typical resistance value* (1±5%)", and use this as the basis for judging whether the parallel branch of the alternator winding is missing. [0003] Due to the relatively large number of parallel branches of AC generators, when a parallel branch of a phase winding is not welded well and the phase winding lacks a parallel branch, its line resistance value still meets the current standard requirements, namely It meets the requirements of "standard resistance value or typical resistance value* (1±5%)"; moreover, the no-load line voltage during the factory test will not change due...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/06G01R31/34
Inventor 李灵军李松柏杨旭斌曲峻冷辉孙娟娟
Owner CSR CHENGDU
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