CN111273108A - Method for judging transformer empty charge tripping reason - Google Patents
Method for judging transformer empty charge tripping reason Download PDFInfo
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Abstract
The invention relates to a method for judging the reason of transformer no-charging tripping. Setting a plurality of first target characteristics of the excitation inrush current; weighting each first target characteristic according to the influence of the plurality of first target characteristics on the transformer air charge trip; comparing the excitation inrush current characteristics with a plurality of first target characteristics to obtain a first weighted integral value; setting a plurality of second target characteristics of the internal fault current; weighting each second target characteristic according to the influence of the plurality of second target characteristics on the transformer air charge trip; comparing the internal fault current characteristics with a plurality of second target characteristics to obtain a second weighted integral value; and judging the fault reason based on the second weighted integral value and the first weighted integral value. The judgment method can quickly judge the reason of the transformer no-charging tripping so as to avoid damage to the transformer caused by reclosing.
Description
Technical Field
The invention relates to the technical field of power system protection, in particular to a fault reason of a main transformer in a power system during empty charging.
Background
In general, the transformer no-charging protection tripping can be caused by two reasons, wherein one reason is the internal fault of the transformer, and the protection action trips during the no-charging; the other reason is that the excitation inrush current characteristics generated during empty charging are not obvious, and the protection inrush current locking of the transformer fails, so that the differential protection action of the transformer trips. When the protection action caused by the magnetizing inrush current is tripped, the tripping operation is acceptable and allowed by regulations due to the imperfect principle of the transformer protection device. But when the transformer is tripped due to the internal fault cause, a fault point needs to be found and the cause is eliminated. It is common practice in the industry to artificially determine the cause of a trip after a transformer is empty to cause a protection trip. However, when there is a fault in the transformer, the fault current may have both the characteristics of the fault current and the characteristics of the magnetizing inrush current when the transformer is in an empty state, which may lead to human misjudgment. When the transformer trip caused by the internal fault is regarded as the trip caused by the magnetizing inrush current, the transformer is damaged greatly by reclosing.
At present, all protection manufacturers at home and abroad prevent protection misoperation caused by excitation inrush current due to the reason when the air charging is carried out on the basis of the waveform characteristics of the excitation inrush current, and the excitation inrush current has the characteristics that: the non-periodic component containing a large component tends to bias the inrush current to one side of the time axis; the excitation surge current generator comprises a large number of high-order harmonic components, and is mainly based on second harmonic and third harmonic, and usually, interruption and asymmetry appear in the excitation surge current waveform; when the air charging is carried out, the three-phase voltage is basically unchanged, and zero-sequence voltage and zero-sequence current are basically absent. However, the characteristics of the magnetizing inrush current are affected by many factors, which causes that the locking of the magnetizing inrush current often fails, so how to identify the magnetizing inrush current and the internal fault current is a problem to be solved urgently.
Disclosure of Invention
Therefore, it is necessary to provide a method for quickly determining the cause of the main transformer no-load charging trip, aiming at the problem of misdetermination during the no-load charging trip of the main transformer.
A method for judging the reason of transformer no-charging trip-out is characterized by comprising the following steps:
setting a plurality of first target characteristics of the excitation inrush current;
weighting each first target characteristic according to the influence of a plurality of first target characteristics of the excitation inrush current on transformer no-load tripping;
comparing the characteristics of the excitation inrush current with a plurality of first target characteristics to obtain a comparison result;
obtaining a first weighted integral value based on the comparison result and the weights of the first target characteristics;
setting a plurality of second target characteristics of the internal fault current;
weighting each second target characteristic according to the influence of the plurality of second target characteristics of the internal fault current on the transformer no-load tripping;
comparing the characteristics of the internal fault current with a plurality of second target characteristics to obtain a comparison result;
obtaining a second weighted integral value based on the comparison result and the weights of the second target characteristics;
and judging the reason of the transformer no-load tripping based on the second weighted integral value and the first weighted integral value.
According to the method for judging the cause of the tripping of the transformer during the empty charging process, when the inside of the transformer has a fault, namely under the condition of the empty charging of the transformer, the fault current has the characteristics of both the internal fault current and the excitation inrush current, the cause of the tripping can be accurately judged, and the transformer is prevented from being greatly damaged when the transformer is switched on again due to misjudgment of the cause of the fault.
In one embodiment, the plurality of first target features includes: the waveform of the magnetizing inrush current deviates to one side of a time axis, the magnetizing inrush current is interrupted and distorted, the amplitude and the waveform of the magnetizing inrush current voltage are unchanged, the content of second harmonic and/or third harmonic in the magnetizing inrush current is larger than a first preset value, and the content of the second harmonic in the magnetizing inrush current tends to increase along with the time.
In one embodiment, the first preset value is greater than 15%.
In one embodiment, in the first target feature, the weight of the magnetizing inrush current waveform biased to one side of the time axis is 5% to 15%, the weight of the magnetizing inrush current waveform interrupted and distorted is 20% to 40%, the weight of the magnetizing inrush voltage and amplitude waveform unchanged is 30% to 50%, the weight of the magnetizing inrush current with the content of the second harmonic and/or the third harmonic greater than a first preset value is 5% to 15%, and the weight of the magnetizing inrush current with the content of the second harmonic tending to increase with time is 5% to 15%.
In one embodiment, the method for obtaining a first weighted integral value based on the comparison result and the weights of a plurality of first target features comprises:
the same characteristic in the magnetizing inrush current as the first target characteristic is assigned with a weight score corresponding to the first target characteristic, and the different characteristic in the magnetizing inrush current from the first target characteristic is assigned with a weight score of 0;
and obtaining the first weighted integral value based on the weighted score of each characteristic in the excitation inrush current.
In one embodiment, the plurality of second target features includes: the internal fault current waveform is symmetrical to a time axis, the internal fault current three-phase sine wave current amplitudes are inconsistent and one phase or two phases are far larger than other phases, the internal fault current voltage amplitude is reduced and the voltage reduced phase corresponds to the current rise, a non-electric quantity protection action alarm or trip signal is provided, and the content of internal fault current second harmonic and/or third harmonic is smaller than a second preset value.
In one embodiment, the second preset value is less than 10%.
In one embodiment, in the second target feature, the weight of the internal fault current waveform symmetrical to the time axis is 5% to 15%, the weight of the current three-phase sine wave current with inconsistent amplitude and with one or two phases being greater than the other phases is 5% to 15%, the weight of the internal fault current with voltage amplitude decreasing and voltage decreasing phase corresponding to current increasing is 30% to 50%, the weight of the non-electric quantity protection action alarm or trip signal is 20% to 40%, and the weight of the internal fault current with the content of the second harmonic and/or third harmonic less than the second preset value is 5% to 15%.
In one embodiment, the method for obtaining a second weighted integral value based on the comparison result and the weights of a plurality of second target features comprises:
the same feature as the second target feature in the internal fault current is assigned a weight score corresponding to the second target feature, and the different feature from the second target feature in the internal fault current is assigned a weight score of 0;
the second weighted integral value is obtained based on the weight scores of the respective features in the internal fault current. In one embodiment, the method for determining the cause of the transformer no-load trip based on the second weighted integral value and the first weighted integral value is as follows:
comparing the second weighted integral value with the first weighted integral value;
when the second weighted integral value is larger than the first weighted integral value, judging that the reason of the transformer no-charging trip is internal fault current;
when the second weighted integral value is smaller than the first weighted integral value, judging that the reason of the transformer no-charging tripping is excitation inrush current;
when the second weighted integral value is equal to the first weighted integral value, comparing the weights of the excitation inrush voltage amplitude and the waveform invariance with the weights of the internal fault current voltage amplitude reduction and the voltage reduction phase and the current rise phase, wherein the weights of the excitation inrush voltage amplitude and the waveform invariance with the weights of the internal fault current voltage amplitude reduction and the voltage reduction phase and the current rise phase are different from each other: at this time, the process of the present invention,
if the weight of the unchanged voltage amplitude and waveform of the magnetizing inrush current is greater than the weight of the voltage amplitude reduction of the internal fault current and the weight of the voltage reduction phase and the current rise phase, judging that the reason of the transformer no-charging trip is the magnetizing inrush current; and if the weight of the unchanged excitation inrush current voltage amplitude and waveform is smaller than the weight of the voltage amplitude reduction of the internal fault current and the weight of the voltage reduction phase and the current rise phase, judging that the cause of the transformer no-charging trip is the internal fault current.
Drawings
Fig. 1 is a flowchart of a method for determining a cause of transformer no-load trip according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, which is a flowchart of a method for determining a cause of transformer no-load trip in an embodiment of the present invention, the method includes the following steps:
s10: setting a plurality of first target characteristics of the excitation inrush current;
s11: weighting each first target characteristic according to the influence of a plurality of first target characteristics of the excitation inrush current on transformer no-load tripping;
s12: comparing the characteristics of the excitation inrush current with a plurality of first target characteristics to obtain a comparison result;
s13: obtaining a first weighted integral value based on the comparison result and the weights of the first target characteristics;
s14: setting a plurality of second target characteristics of the internal fault current;
s15: weighting each second target characteristic according to the influence of the plurality of second target characteristics of the internal fault current on the transformer no-load tripping;
s16: comparing the characteristics of the internal fault current with a plurality of second target characteristics to obtain a comparison result;
s17: obtaining a second weighted integral value based on the comparison result and the weights of the second target characteristics;
s18: and judging the reason of the transformer no-load tripping based on the second weighted integral value and the first weighted integral value.
In one example, the several first target characteristics established by step S10 are: the waveform of the magnetizing inrush current deviates to one side of a time axis, the magnetizing inrush current is interrupted and distorted, the amplitude and the waveform of the magnetizing inrush current voltage are unchanged, the content of second harmonic and/or third harmonic in the magnetizing inrush current is larger than a first preset value, and the content of the second harmonic in the magnetizing inrush current tends to increase along with the time.
In an optional example, the first preset value is greater than 15%.
In one example, the influence of several first target characteristics of the magnetizing inrush current on the transformer no-load trip in step S11 is weighted as follows: in the first target feature, the weight of the magnetizing inrush current waveform on the side of the time axis is 5% to 15%, specifically, the weight of the magnetizing inrush current waveform on the side of the time axis is 5%, 10% and 15%, the weight of the magnetizing inrush current waveform with discontinuity and distortion is 20% to 40%, specifically, the weight of the magnetizing inrush current waveform with discontinuity and distortion is 20%, 30% and 40%, the weight of the magnetizing inrush voltage with unchanged amplitude waveform is 30% to 50%, specifically, the weight of the magnetizing inrush voltage with unchanged amplitude waveform is 30%, 40% and 50%, the weight of the magnetizing inrush current with the content of the second harmonic and/or the third harmonic greater than a first preset value is 5% to 15%, specifically, the weight of the magnetizing inrush current with the content of the second harmonic and/or the third harmonic greater than the first preset value is 5%, 10% and 15%, wherein the weight of the second harmonic content in the magnetizing inrush current increasing with the time is 5% -15%, and specifically, the weight of the second harmonic content in the magnetizing inrush current increasing with the time can be 5%, 10% and 15%.
In one example, in step S12, the characteristics of the magnetizing inrush current are compared with several first target characteristics one by one to distinguish the same characteristics of the magnetizing inrush current as the first target characteristics from different characteristics of the magnetizing inrush current as the first target characteristics.
In one example, step S13 includes:
s131: the same characteristic in the magnetizing inrush current as the first target characteristic is assigned with a weight score corresponding to the first target characteristic, and the different characteristic in the magnetizing inrush current from the first target characteristic is assigned with a weight score of 0;
s132: and obtaining the first weighted integral value based on the weighted score of each characteristic in the excitation inrush current. Specifically, the weighted scores of the features are sequentially added to obtain a weighted integral value.
Specifically, the waveform of the magnetizing inrush current deviates to one side of a time axis, the magnetizing inrush current is interrupted and distorted, the amplitude and the waveform of the magnetizing inrush current voltage are unchanged, the content of second harmonic and/or third harmonic in the magnetizing inrush current is greater than a first preset value, the content of the second harmonic in the magnetizing inrush current increases with the lapse of time, when the magnetizing inrush current meets the characteristics, the characteristic items are assigned with the above target characteristics according to bisection values and are respectively marked as X1, X2, X3, X4 and X5, and the first weighting integral value is marked as X; if one characteristic of the magnetizing inrush current is the same as the first target characteristic X1, one characteristic is the same as the second target characteristic X2, one characteristic is the same as the third target characteristic X3, one characteristic is the same as the fourth target characteristic X4, and one characteristic is the same as the fifth target characteristic X5, the first weighted integral value is X1+ X2+ X3+ X4+ X5. If one characteristic of the magnetizing inrush current is the same as the first target characteristic X1, two characteristics of the magnetizing inrush current are the same as the second target characteristic X2, one characteristic of the magnetizing inrush current is the same as the third target characteristic X3, one characteristic of the magnetizing inrush current is the same as the fourth target characteristic X4, and two characteristics of the magnetizing inrush current are the same as the fifth target characteristic X5, the first weighted integral value is X1+2X2+ X3+ X4+2X 5. The rest of the cases are analogized in turn, and the description is not repeated one by one.
In one example, the several second target characteristics established by step S14 are: the internal fault current waveform is symmetrical to a time axis, the internal fault current three-phase sine wave current amplitudes are inconsistent and one phase or two phases are far larger than other phases, the internal fault current voltage amplitude is reduced and the voltage reduced phase corresponds to the current rise, a non-electric quantity protection action alarm or trip signal is provided, and the content of internal fault current second harmonic and/or third harmonic is smaller than a second preset value.
In an optional example, the second preset value is less than 10%.
In one example, step S15 weights each of the second target characteristics of the internal fault current according to its effect on transformer no-load trip: the weight of the internal fault current waveform symmetrical to a time axis is 5% -15%, specifically, the weight of the internal fault current waveform symmetrical to the time axis can be 5%, 10%, 15%, the weight of the current three-phase sine wave current waveform asymmetrical to the time axis can be 5% -15%, specifically, the weight of the current three-phase sine wave current waveform asymmetrical to the time axis can be 5%, 10%, 15%, the weight of the voltage amplitude of the internal fault current is reduced, the weight of the voltage phase, specifically, the weight of the alarm or trip signal with the non-electric quantity protection action may be 20%, 30%, and 40%, and the weight of the internal fault current second harmonic and/or third harmonic content smaller than the second preset value may be 5% to 15%, and specifically, the weight of the internal fault current second harmonic and/or third harmonic content smaller than the second preset value may be 5%, 10%, and 15%.
In one example, the characteristics of the internal fault current are compared with several second target characteristics in step S16 one by one to distinguish the same characteristics of the internal fault current as the second target characteristics from different characteristics of the internal fault current as the second target characteristics.
In one example, step S17 includes:
s171: the same characteristic in the magnetizing inrush current as the first target characteristic is assigned with a weight score corresponding to the first target characteristic, and the different characteristic in the magnetizing inrush current from the first target characteristic is assigned with a weight score of 0;
s172: and obtaining the first weighted integral value based on the weighted score of each characteristic in the excitation inrush current. Specifically, the weighted scores of the features are sequentially added to obtain a weighted integral value.
Specifically, the waveform of the internal fault current is symmetrical to a time axis, the amplitudes of three-phase sine wave currents of the internal fault current are inconsistent and one or two phases are far larger than other phases, the voltage amplitude of the internal fault current is reduced and a voltage reduction phase corresponds to the current rise, a non-electric protection action alarm or trip signal is provided, the content of the second harmonic and/or third harmonic of the internal fault current is smaller than a second preset value, when the internal fault current meets the characteristics, the characteristic items are assigned with the above target characteristics according to fractional values and are respectively marked as Y1, Y2, Y3, Y4 and Y5, and the first weighted integral value is marked as Y; if one characteristic of the magnetizing inrush current is the same as the first target characteristic Y1, one characteristic is the same as the second target characteristic Y2, one characteristic is the same as the third target characteristic Y3, one characteristic is the same as the fourth target characteristic Y4, and one characteristic is the same as the fifth target characteristic Y5, the first weighted integral value is Y1+ Y2+ Y3+ Y4+ Y5. If one characteristic of the magnetizing inrush current is the same as the first target characteristic Y1, two characteristics of the magnetizing inrush current are the same as the second target characteristic Y2, one characteristic of the magnetizing inrush current is the same as the third target characteristic Y3, one characteristic of the magnetizing inrush current is the same as the fourth target characteristic Y4, and two characteristics of the magnetizing inrush current are the same as the fifth target characteristic Y5, the first weighted integral value is Y1+2Y2+ Y3+ Y4+2Y 5. The rest of the cases are analogized in turn, and the description is not repeated one by one.
In one example, step S18 determines the cause of the transformer no-load trip based on the second weighted integral value and the first weighted integral value.
According to the method for judging the cause of the tripping of the transformer during the no-load charging, when the inside of the transformer is in fault, namely under the condition of the no-load charging of the transformer, when the fault current has the characteristics of both the internal fault current and the excitation inrush current, the cause of the tripping can be accurately judged, and the transformer is prevented from being greatly damaged when being switched on again due to misjudgment of the cause of the fault.
The specific method of step S18 in the flowchart of the method for determining the cause of the transformer no-load trip in an embodiment of the present invention is as follows:
comparing the second weighted integral value with the first weighted integral value;
when the second weighted integral value is larger than the first weighted integral value, judging that the reason of the transformer no-charging trip is internal fault current;
and when the second weighted integral value is smaller than the first weighted integral value, judging that the reason of the transformer no-charging trip is excitation inrush current.
When the second weighted integral value is equal to the first weighted integral value, the weight that the magnetizing inrush current voltage amplitude and the waveform are not changed is compared with the weight that the internal fault current voltage amplitude is reduced and the voltage reduction phase and the current increase phase are increased. That is, when the second weighted integral value is equal to the first weighted integral value, the weighting term X3 of the magnetizing inrush current is compared with the internal fault current weighting term Y3. The weighting term X3 of the magnetizing inrush current and the weighting term Y3 of the internal fault current are different in weight from each other.
And if the weight of the unchanged excitation inrush current voltage amplitude and waveform is greater than the weight of the voltage amplitude reduction and the voltage reduction phase and the current rise phase of the internal fault current, judging that the cause of the transformer no-load tripping is the internal fault current.
According to the method for judging the cause of the tripping of the transformer during the no-load charging, when the inside of the transformer is in fault, namely under the condition of the no-load charging of the transformer, when the fault current has the characteristics of both the internal fault current and the excitation inrush current, the cause of the tripping can be accurately judged, and the transformer is prevented from being greatly damaged when being switched on again due to misjudgment of the cause of the fault.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The method for judging the cause of the transformer empty charge trip-out is characterized by comprising the following steps:
setting a plurality of first target characteristics of the excitation inrush current;
weighting each first target characteristic according to the influence of a plurality of first target characteristics of the excitation inrush current on transformer no-load tripping;
comparing the characteristics of the excitation inrush current with a plurality of first target characteristics to obtain a comparison result;
obtaining a first weighted integral value based on the comparison result and the weights of the first target characteristics;
setting a plurality of second target characteristics of the internal fault current;
weighting each second target characteristic according to the influence of the plurality of second target characteristics of the internal fault current on the transformer no-load tripping;
comparing the characteristics of the internal fault current with a plurality of second target characteristics to obtain a comparison result;
obtaining a second weighted integral value based on the comparison result and the weights of the second target characteristics;
and judging the reason of the transformer no-load tripping based on the second weighted integral value and the first weighted integral value.
2. The method for determining the cause of the transformer no-charging trip-out according to claim 1, wherein the first target characteristics comprise: the waveform of the magnetizing inrush current deviates to one side of a time axis, the magnetizing inrush current is interrupted and distorted, the amplitude and the waveform of the magnetizing inrush current voltage are unchanged, the content of second harmonic and/or third harmonic in the magnetizing inrush current is larger than a first preset value, and the content of the second harmonic in the magnetizing inrush current tends to increase along with the time.
3. The method for judging the cause of the transformer no-charging trip-out according to claim 2, wherein the first preset value is greater than 15%.
4. The method for determining the cause of the transformer no-load trip according to claim 3, wherein in the first target feature, the weight of the magnetizing inrush current waveform biased to one side of a time axis is 5% to 15%, the weight of the magnetizing inrush current waveform interrupted and distorted is 20% to 40%, the weight of the magnetizing inrush current with unchanged voltage and amplitude waveform is 30% to 50%, the weight of the magnetizing inrush current with the content of the second harmonic and/or the third harmonic greater than the first preset value is 5% to 15%, and the weight of the magnetizing inrush current with the content of the second harmonic increasing with time is 5% to 15%.
5. The method for determining the cause of transformer no-load tripping according to claim 3, wherein the step of obtaining a first weighted integral value based on the comparison result and the weights of the first target characteristics comprises:
the same characteristic in the magnetizing inrush current as the first target characteristic is assigned with a weight score corresponding to the first target characteristic, and the different characteristic in the magnetizing inrush current from the first target characteristic is assigned with a weight score of 0;
and obtaining the first weighted integral value based on the weighted score of each characteristic in the excitation inrush current.
6. The method for determining the cause of the transformer no-charging trip-out according to claim 1, wherein the second target characteristics comprise: the internal fault current waveform is symmetrical to a time axis, the internal fault current three-phase sine wave current amplitudes are inconsistent and one phase or two phases are far larger than other phases, the internal fault current voltage amplitude is reduced and the voltage reduced phase corresponds to the current rise, a non-electric quantity protection action alarm or trip signal is provided, and the content of internal fault current second harmonic and/or third harmonic is smaller than a second preset value.
7. The method for judging the cause of the transformer no-charging trip-out according to claim 6, wherein the second preset value is less than 10%.
8. The method for determining the cause of the transformer air charge trip according to claim 6, wherein in the second target feature, the weight of the waveform of the internal fault current symmetrical to the time axis is 5% to 15%, the weight of the waveform of the current of the three-phase sine wave with inconsistent amplitudes and one or two phases being far greater than the other phases is 5% to 15%, the weight of the waveform of the internal fault current with a voltage drop and a phase of the voltage drop corresponding to a current rise is 30% to 50%, the weight of the waveform of the non-electric quantity protection action alarm or trip signal is 20% to 40%, and the weight of the waveform of the internal fault current with a second harmonic and/or third harmonic content less than a second predetermined value is 5% to 15%.
9. The method for determining the cause of transformer no-load tripping according to claim 6, wherein the step of obtaining a second weighted integral value based on the comparison result and the weights of the second target characteristics comprises:
the same feature as the second target feature in the internal fault current is assigned a weight score corresponding to the second target feature, and the different feature from the second target feature in the internal fault current is assigned a weight score of 0;
the second weighted integral value is obtained based on the weight scores of the respective features in the internal fault current.
10. The method for determining the cause of the transformer no-load trip according to claim 6, wherein the method for determining the cause of the transformer no-load trip based on the second weighted integral value and the first weighted integral value comprises:
comparing the second weighted integral value with the first weighted integral value;
when the second weighted integral value is larger than the first weighted integral value, judging that the reason of the transformer no-charging trip is internal fault current;
when the second weighted integral value is smaller than the first weighted integral value, judging that the reason of the transformer no-charging tripping is excitation inrush current;
when the second weighted integral value is equal to the first weighted integral value, comparing the weights of the excitation inrush voltage amplitude and the waveform invariance with the weights of the internal fault current voltage amplitude reduction and the voltage reduction phase and the current rise phase, wherein the weights of the excitation inrush voltage amplitude and the waveform invariance with the weights of the internal fault current voltage amplitude reduction and the voltage reduction phase and the current rise phase are different from each other: at this time, the process of the present invention,
if the weight of the unchanged voltage amplitude and waveform of the magnetizing inrush current is greater than the weight of the voltage amplitude reduction of the internal fault current and the weight of the voltage reduction phase and the current rise phase, judging that the reason of the transformer no-charging trip is the magnetizing inrush current; and if the weight of the unchanged excitation inrush current voltage amplitude and waveform is smaller than the weight of the voltage amplitude reduction of the internal fault current and the weight of the voltage reduction phase and the current rise phase, judging that the cause of the transformer no-charging trip is the internal fault current.
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