CN104198878B - A kind of method judging whether threephase alternator winding lacks parallel branch - Google Patents

Abstract

The invention discloses a kind of method judging whether threephase alternator winding lacks parallel branch, by qualified threephase alternator group winding is tested and is calculated, calculating line resistance when obtaining set point of temperature and phase resistance, line resistance in the case of calculating lacks parallel circuit again and phase resistance, thus the deviation amplitude in the case of calculating line resistance and lacking parallel circuit, in this, as standard to other threephase alternators to be tested.This method can judge that threephase alternator winding is the most qualified conveniently and efficiently, thus effectively prevents from surrendering the electromotor lacking parallel branch as normal product.

Description

A kind of method judging whether threephase alternator winding lacks parallel branch

Technical field

The present invention relates to technical field of generators, a kind of method judging whether threephase alternator winding lacks parallel branch.

Background technology

For polyphase alternator, existing standard-required is the line resistance value measuring winding.This measured value should meet the requirement of " standard electric resistance or representative resistor values * (1 ± 5%) ", the judgment basis whether lacked in this, as alternator winding parallel branch.

Owing to the parallel branch number of alternating current generator is the most, when certain phase winding a parallel branch unwelded good and when causing this phase winding to lack a parallel branch, its line resistance value still conforms to existing standard-required, i.e. meets the requirement of " standard electric resistance or representative resistor values * (1 ± 5%) "；And, non-loaded line voltage during delivery test will not change because lacking a parallel branch, and the deviation of short circuit phase current and three-phase meansigma methods is not more than the requirement of " standard electric resistance or representative resistor values * (1 ± 5%) ".Therefore, according to existing measuring method, even if the line resistance value of the actual measurement of generator windings meets the requirement of " standard electric resistance or representative resistor values * (1 ± 5%) ", electromotor it is equally possible that there are the phenomenon of parallel branch disappearance, thus cause and user can not be handed over to use the electromotor in disappearance parallel branch.

Therefore, how the situation of each parallel branch of alternating current generator is judged exactly, become one to be highly desirable to solve the technical problem that.

Summary of the invention

The goal of the invention of the present invention is: for the problem of above-mentioned existence, it is provided that a kind of method judging whether threephase alternator winding lacks parallel branch.

The technical solution used in the present invention is such that

A kind of method judging whether threephase alternator winding lacks parallel branch, the every of involved threephase alternator winding includes a phase lead-out wire, a phase collector ring and the phase winding being made up of d road parallel branch mutually, wherein d >=2, three-phase is crossed by N phase collector ring, it is characterised in that include following step:

(1) in surface temperature and ambient temperature t of phase winding and iron core thereof_{Actual n}Difference less than under conditions of 4 DEG C, measure the actual cold conditions line resistance R of at least 4 qualified motor windings of statistics_{Actual line resistance n}With corresponding ambient temperature t_{Actual n}, wherein, n is n-th by measured motor winding, n=1,2,3,4 ...；

(2) formula R is utilized_{Calculate line resistance n}=R_{Actual line resistance n}× (235+t_{Set point of temperature})/(235+t_{Actual n}) by actual cold conditions line resistance R_{Actual line resistance n}It is converted into set point of temperature t_{Set point of temperature}Time winding calculating cold conditions line resistance R_{Calculate line resistance n}；

(3) formula R is utilized_{Normal line resistance}=(R_{Calculate line resistance 1}+ R_{Calculate line resistance 2}+ R_{Calculate line resistance 3}+R_{Calculate line resistance 4}+ ...)/G calculate each calculating cold conditions line resistance arithmetic mean of instantaneous value R_{Normal line resistance}, G is by measured motor number of windings amount；

(4) formula R is utilized_{Standard phase resistance}= R_{Normal line resistance}/ 2 computational rules temperature t_{Set point of temperature}Time winding phase resistance value R_{Standard phase resistance}；

(5) formula R is utilized_{Standard branch resistance}=R_{Standard phase resistance}* d computational rules temperature t_{Set point of temperature}Time each parallel branch cold conditions standard branch resistance R_{Standard branch resistance}；

(6) computational rules temperature t_{Set point of temperature}Phase resistance R of winding when certain phase winding lacks a parallel branch '_{Phase resistance 1}=R_{Standard branch resistance}/ (d-1), the phase resistance of two other winding is R '_{Phase resistance 2}= R’_{Phase resistance 3}=R_{Standard branch resistance}/d=R_{Standard phase resistance}；

(7) computational rules temperature t_{Set point of temperature}The line resistance of threephase alternator three-phase windings when certain phase winding lacks a parallel branch, one of them winding wire resistance is R_{Line resistance 1}=(R_{Standard phase resistance}+ R_{Standard phase resistance})=R_{Normal line resistance}, the line resistance of two other winding is R_{Line resistance 2}=R_{Line resistance 3}=(R_{Standard phase resistance}+R’_{Phase resistance 1})；

(8) computational rules temperature t_{Set point of temperature}Line resistance deviation amplitude M of threephase alternator three-phase windings and phase resistance deviation amplitude N, M=(R when certain phase winding lacks a parallel branch_{Line resistance 2}Or R_{Line resistance 3}-R_{Normal line resistance})/R_{Normal line resistance}, N=(R '_{Phase resistance 1}- R_{Standard phase resistance})/R_{Standard phase resistance}, and by R_{Normal line resistance}× (1 ± M) is as the conversion line resistance standard of winding；

(9) actual measurement line resistance or the phase resistance of tested threephase alternator winding are converted into set point of temperature t_{Set point of temperature}Time conversion line resistance or conversion phase resistance, if conversion line resistance at R_{Normal line resistance}× (1-M)～R_{Normal line resistance}In the range of × (1+M) or conversion phase resistance at R_{Standard phase resistance}× (1-N)～R_{Standard phase resistance}In the range of × (1+N), then can determine that tested threephase alternator winding does not lack parallel branch, for qualified products, otherwise, for substandard product.

In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows: first pass through and qualified threephase alternator is carried out test and corresponding calculating, obtain threephase alternator phase winding lacks a resistance deviation during parallel branch, thus resistance deviation amplitude when obtaining threephase alternator winding parallel branch road disappearance, in this, as basis for estimation, threephase alternator to be tested is tested, thus effectively prevents from surrendering the electromotor lacking parallel branch as normal product.

Accompanying drawing explanation

Fig. 1 is that the threephase alternator winding involved by the embodiment of the present invention connects circuit diagram.

Labelling in figure: UA is U phase collector ring, and UB is U phase lead-out wire, and UC is U phase winding, and VA is V phase collector ring, and VB is V phase lead-out wire, and VC is V phase winding, and WA is W phase collector ring, and WB is W phase lead-out wire, and WC is W phase winding, and D is N phase collector ring.

Detailed description of the invention

Below in conjunction with the accompanying drawings, the present invention is described in detail.

Embodiment:

Every in threephase alternator winding involved by this method include mutually a phase lead-out wire, a phase collector ring and by d(d >=2) phase winding that forms of road parallel branch, by b(b in each parallel branch >=1) individual coils connected in series forms (during b=1, the most there is not the saying of series connection), three-phase is crossed, as shown in Figure 1 by N phase collector ring.This determination methods includes following step:

(1) in surface temperature and ambient temperature t of phase winding and iron core thereof_{Actual n}Difference less than under conditions of 4 DEG C, measure the actual cold conditions line resistance R of at least 4 qualified motor windings of statistics_{Actual line resistance n}With corresponding ambient temperature t_{Actual n}, wherein, n is n-th by measured motor winding, n=1,2,3,4 ...；

(2) formula R is utilized_{Calculate line resistance n}=R_{Actual line resistance n}× (235+t_{Set point of temperature})/(235+t_{Actual n}) by actual cold conditions line resistance R_{Actual line resistance n}It is converted into set point of temperature t_{Set point of temperature}Time winding calculating cold conditions line resistance R_{Calculate line resistance n}；

(3) formula R is utilized_{Normal line resistance}=(R_{Calculate line resistance 1}+ R_{Calculate line resistance 2}+ R_{Calculate line resistance 3}+R_{Calculate line resistance 4}+ ...)/G calculate each calculating cold conditions line resistance arithmetic mean of instantaneous value R_{Normal line resistance}, G is by measured motor number of windings amount；

(4) formula R is utilized_{Standard phase resistance}= R_{Normal line resistance}/ 2 computational rules temperature t_{Set point of temperature}Time winding phase resistance value R_{Standard phase resistance}；

(5) formula R is utilized_{Standard branch resistance}=R_{Standard phase resistance}* d computational rules temperature t_{Set point of temperature}Time each parallel branch cold conditions standard branch resistance R_{Standard branch resistance}；

(6) computational rules temperature t_{Set point of temperature}Phase resistance R of winding when certain phase winding lacks a parallel branch '_{Phase resistance 1}=R_{Standard branch resistance}/ (d-1), the phase resistance of two other winding is R '_{Phase resistance 2}= R’_{Phase resistance 3}=R_{Standard branch resistance}/d=R_{Standard phase resistance}；

(7) computational rules temperature t_{Set point of temperature}The line resistance of threephase alternator three-phase windings when certain phase winding lacks a parallel branch, one of them winding wire resistance is R_{Line resistance 1}=(R_{Standard phase resistance}+ R_{Standard phase resistance})=R_{Normal line resistance}, the line resistance of two other winding is R_{Line resistance 2}=R_{Line resistance 3}=(R_{Standard phase resistance}+R’_{Phase resistance 1})；

(8) computational rules temperature t_{Set point of temperature}Line resistance deviation amplitude M of threephase alternator three-phase windings and phase resistance deviation amplitude N, M=(R when certain phase winding lacks a parallel branch_{Line resistance 2}Or R_{Line resistance 3}-R_{Normal line resistance})/R_{Normal line resistance}, N=(R '_{Phase resistance 1}-R_{Standard phase resistance})/R_{Standard phase resistance}, and by R_{Normal line resistance}× (1 ± M) is as the conversion line resistance standard of winding；

(9) actual measurement line resistance or the phase resistance of tested threephase alternator winding are converted into set point of temperature t_{Set point of temperature}Time conversion line resistance or conversion phase resistance, if conversion line resistance at R_{Normal line resistance}× (1-M)～R_{Normal line resistance}In the range of × (1+M) or conversion phase resistance at R_{Standard phase resistance}× (1-N)～R_{Standard phase resistance}In the range of × (1+N), then can determine that tested threephase alternator winding does not lack parallel branch, for qualified products, otherwise, for substandard product.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.

Claims (1)

1. the method judging whether threephase alternator winding lacks parallel branch, the every of involved threephase alternator winding includes a phase lead-out wire, a phase collector ring and the phase winding being made up of d road parallel branch mutually, wherein d >=2, three-phase is crossed by N phase collector ring, it is characterised in that include following step:

(1) in surface temperature and ambient temperature t of phase winding and iron core thereof_{Actual n}Difference less than under conditions of 4 DEG C, measure the actual cold conditions line resistance R of at least 4 qualified motor windings of statistics_{Actual line resistance n}With corresponding ambient temperature t_{Actual n}, wherein, n is n-th by measured motor winding, n=1,2,3,4 ...；

(2) formula R is utilized_{Calculate line resistance n}=R_{Actual line resistance n}× (235+t_{Set point of temperature})/(235+t_{Actual n}) by actual cold conditions line resistance R_{Actual line resistance n}It is converted into set point of temperature t_{Set point of temperature}Time winding calculating cold conditions line resistance R_{Calculate line resistance n}；

(3) formula R is utilized_{Normal line resistance}=(R_{Calculate line resistance 1}+ R_{Calculate line resistance 2}+ R_{Calculate line resistance 3}+R_{Calculate line resistance 4}+ ...)/G, calculate the arithmetic mean of instantaneous value R of each calculating cold conditions line resistance_{Normal line resistance}, G is by measured motor number of windings amount；

(4) formula R is utilized_{Standard phase resistance}= R_{Normal line resistance}/ 2 computational rules temperature t_{Set point of temperature}Time winding phase resistance value R_{Standard phase resistance}；

(5) formula R is utilized_{Standard branch resistance}=R_{Standard phase resistance}* d computational rules temperature t_{Set point of temperature}Time each parallel branch cold conditions standard branch resistance R_{Standard branch resistance}；

(6) computational rules temperature t_{Set point of temperature}Phase resistance R of winding when certain phase winding lacks a parallel branch '_{Phase resistance 1}=R_{Standard branch resistance}/ (d-1), the phase resistance of two other winding is R '_{Phase resistance 2}= R’_{Phase resistance 3}=R_{Standard branch resistance}/d=R_{Standard phase resistance}；

(7) computational rules temperature t_{Set point of temperature}The line resistance of threephase alternator three-phase windings when certain phase winding lacks a parallel branch, one of them winding wire resistance is R_{Line resistance 1}=(R_{Standard phase resistance}+ R_{Standard phase resistance})=R_{Normal line resistance}, the line resistance of two other winding is R_{Line resistance 2}=R_{Line resistance 3}=(R_{Standard phase resistance}+R’_{Phase resistance 1})；

(8) computational rules temperature t_{Set point of temperature}Line resistance deviation amplitude M of threephase alternator three-phase windings and phase resistance deviation amplitude N, M=(R when certain phase winding lacks a parallel branch_{Line resistance 2}Or R_{Line resistance 3}-R_{Normal line resistance})/R_{Normal line resistance}, N=(R '_{Phase resistance 1}-R_{Standard phase resistance})/R_{Standard phase resistance}, and by R_{Normal line resistance}× (1 ± M) is as the conversion line resistance standard of winding；

(9) actual measurement line resistance or the phase resistance of tested threephase alternator winding are converted into set point of temperature t_{Set point of temperature}Time conversion line resistance or conversion phase resistance, if conversion line resistance at R_{Normal line resistance}× (1-M)～R_{Normal line resistance}In the range of × (1+M) or conversion phase resistance at R_{Standard phase resistance}× (1-N)～R_{Standard phase resistance}In the range of × (1+N), then can determine that tested threephase alternator winding does not lack parallel branch, for qualified products, otherwise, for substandard product.