CN102222880A - Method for identifying inrush exciting current of transformer and avoiding differential protection maloperation of transformer - Google Patents
Method for identifying inrush exciting current of transformer and avoiding differential protection maloperation of transformer Download PDFInfo
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- CN102222880A CN102222880A CN2011101548452A CN201110154845A CN102222880A CN 102222880 A CN102222880 A CN 102222880A CN 2011101548452 A CN2011101548452 A CN 2011101548452A CN 201110154845 A CN201110154845 A CN 201110154845A CN 102222880 A CN102222880 A CN 102222880A
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Abstract
The invention provides a method for identifying inrush exciting current of a transformer and avoiding differential protection maloperation of the transformer. A method for judging whether preset conditions of various input and output side switches of a locked transformer are accorded at present is that: the preset conditions of various input and output side switches are not accorded if any of the following conditions occurs, wherein the first condition is that: after protection is started, current on any side of the transformer is not reduced; the second condition is that: after protection is started, current on any two sides of the transformer is greater than a preset threshold value; furthermore, other two conditions are present, namely the third condition is that the maximum current on any side of the transformer is greater than the preset maximum inrush exciting current value in preset time after protection is started, and the fourth condition is that the current value on any side of the transformer is greater than a preset current value at a corresponding moment on any time point in the preset time after protection is started. By the method, inrush exciting current conditions of the transformer can be more accurately judged; therefore, the transformer is accurately controlled.
Description
Technical field:
The present invention relates to the tranformer protection field, relate in particular to and a kind ofly discern transformer excitation flow and prevent the method that it causes the transformer differential protection malfunction.
Background technology:
During the air-drop transformer; can produce bigger magnetizing inrush current; may cause the transformer differential protection malfunction; present transformer differential protection all is to utilize the characteristics of magnetizing inrush current waveform to discern magnetizing inrush current; the characteristics of magnetizing inrush current waveform have interval angle, waveform symmetry degree different with normal current as: waveform; or the harmonic wave amount of other frequencies is higher than normal value (as: containing second harmonic, quintuple harmonics etc.), and present processing means are to judge that drawing is that tranformer protection takes method such as locking in short-term to prevent the transformer differential protection malfunction behind the magnetizing inrush current.
The groundwork flow process of present tranformer protection, as shown in Figure 1, concrete step is as described below:
1), at first, the transformer self check, and judge that self-detection result whether in the normal condition scope, is all normally as self-detection result, enter step 2); There is improper situation as self-detection result, enters step 8);
2), transformer is by set point input protection, then, enters step 3);
3), transformer both sides electric current, information of voltage are gathered, enter step 4) afterwards;
4), the electric current, the information of voltage that obtain according to step 3) judge the current default tranformer protection entry condition that whether satisfies, if satisfy, enters step 5), if do not satisfy, returns step 3);
5), the electric current, the information of voltage that obtain according to step 3) judge the current default transformer fault condition that whether satisfies, if satisfy, enters step 6), if do not satisfy, returns step 3);
6), the electric current, the information of voltage that obtain according to step 3) judge current whether satisfy each input of default locking transformer, outlet side switch condition, if satisfy, returns step 3), if do not satisfy, enters step 7);
7), carry out actions such as tripping operation, alarm;
8), improper self-detection result information is alarmed; Afterwards, enter step 9);
9), judged whether slot signal, if having, return step 1), if do not have, return step 8).
But; at present to the 6th) step " whether satisfy the condition of each input of default locking transformer, outlet side switch " in the determination methods more complicated of identification magnetizing inrush current; amount of calculation is big; efficient is lower; erroneous judgement appears easily; thereby the transformer differential protection incorrect operation occurs,, can avoid the transformer differential protection malfunction more accurately if can judge the magnetizing inrush current situation of transformer more exactly.
Summary of the invention:
The purpose of this invention is to provide a kind of method of discerning transformer excitation flow and avoiding the transformer differential protection malfunction, judge the magnetizing inrush current situation of transformer more exactly, thereby avoid the differential protection malfunction of transformer.
A kind of method of discerning transformer excitation flow and avoiding the transformer differential protection malfunction, concrete step is as described below:
1), at first, the transformer self check, and judge that self-detection result whether in the normal condition scope, is all normally as self-detection result, enter step 2); There is improper situation as self-detection result, enters step 8);
2), transformer is by set point input protection, then, enters step 3);
3), transformer both sides electric current, information of voltage are gathered, enter step 4) afterwards;
4), the electric current, the information of voltage that obtain according to step 3) judge the current default tranformer protection entry condition that whether satisfies, if satisfy, enters step 5), if do not satisfy, returns step 3);
5), the electric current, the information of voltage that obtain according to step 3) judge the current default transformer fault condition that whether satisfies, if satisfy, enters step 6), if do not satisfy, returns step 3);
6), the electric current that obtains according to step 3), information of voltage are judged the condition of each input of current whether locking transformer, outlet side switch, if satisfy the condition of each input of locking transformer, outlet side switch, return step 3), if do not satisfy the condition of each input of locking transformer, outlet side switch, enter step 7);
7), carry out actions such as tripping operation, alarm;
8), improper self-detection result information is alarmed; Afterwards, enter step 9);
9), judged whether slot signal, if having, return step 1), if do not have, return step 8);
Wherein: the concrete grammar of " judging the current condition that whether satisfies each input of default locking transformer, outlet side switch " in the step 6) is: following arbitrary situation takes place, promptly be judged as the condition that does not satisfy each input of default locking transformer, outlet side switch:
Situation one: after protection started, each side current value of transformer did not all reduce phenomenon;
Situation two: when protection started, transformation had a high regard for the both sides electric current greater than default the stream threshold value to be arranged.
Described identification transformer excitation flow is also avoided the method for transformer differential protection malfunction; wherein: in the concrete grammar of " judging the current condition that whether satisfies each input of default locking transformer, outlet side switch " in the described step 6): be judged as the condition that does not satisfy each input of default locking transformer, outlet side switch, also comprise following arbitrary situation:
Situation three), protection starts in the stipulated time of back, transformer either side lowest high-current value is greater than predefined maximum magnetizing inrush current current value;
Situation four), protection starts on arbitrary moment point in the stipulated time of back, transformer either side current value is greater than predefined corresponding current value constantly.
The present invention will reach following technique effect after adopting technique scheme:
Identification transformer excitation flow of the present invention is also avoided the method for transformer differential protection malfunction; be that the characteristics of utilizing transformer air-drop back magnetizing inrush current to decay are rapidly discerned magnetizing inrush current; and the short circuit current that transformer fault causes is unattenuated; even drop in failure transformer; though magnetizing inrush current is arranged in the electric current; but still have very big fault current after this current attenuation; the inventive method does not change the groundwork flow process of present tranformer protection; the locking Rule of judgment that has been unique design only; barring condition can be judged whether to satisfy more exactly, thereby in the identification transformer excitation flow, the transformer differential protection malfunction can be avoided.
Description of drawings:
Fig. 1 is the groundwork flow chart of tranformer protection in the prior art;
Fig. 2 judges the current concrete grammar schematic diagram that whether satisfies each input of default locking transformer, outlet side switch condition in identification transformer excitation flow of the present invention and the method for avoiding the transformer differential protection malfunction.
Embodiment:
Identification transformer excitation flow of the present invention is also avoided the method for transformer differential protection malfunction, and concrete step is as described below:
1), at first, the transformer self check, and judge that self-detection result whether in the normal condition scope, is all normally as self-detection result, enter step 2); There is improper situation as self-detection result, enters step 8);
2), transformer is by set point input protection, then, enters step 3);
3), transformer both sides electric current, information of voltage are gathered, enter step 4) afterwards;
4), the electric current, the information of voltage that obtain according to step 3) judge the current default tranformer protection entry condition that whether satisfies, if satisfy, enters step 5), if do not satisfy, returns step 3);
5), the electric current, the information of voltage that obtain according to step 3) judge the current default transformer fault condition that whether satisfies, if satisfy, enters step 6), if do not satisfy, returns step 3);
6), the electric current that obtains according to step 3), information of voltage are judged the condition of each input of current whether locking transformer, outlet side switch, if satisfy the condition of each input of locking transformer, outlet side switch, return step 3), if do not satisfy the condition of each input of locking transformer, outlet side switch, enter step 7);
7), carry out actions such as tripping operation, alarm;
8), improper self-detection result information is alarmed; Afterwards, enter step 9);
9), judged whether slot signal, if having, return step 1), if do not have, return step 8);
Wherein: the concrete grammar of " judging the current condition that whether satisfies each input of default locking transformer, outlet side switch " in the step 6) is: following arbitrary situation takes place, promptly be judged as the condition that does not satisfy each input of default locking transformer, outlet side switch:
Situation one: after protection started, each side current value of transformer did not all reduce phenomenon;
Situation two: when protection started, transformation had a high regard for the both sides electric current greater than default the stream threshold value to be arranged;
Situation three, protection started in the stipulated time of back, and transformer either side lowest high-current value is greater than predefined maximum magnetizing inrush current current value;
On arbitrary moment point after situation four, protection start in the stipulated time, transformer either side current value is greater than predefined corresponding current value constantly.
Wherein, situation three and situation four are applicable to the situation of dropping not latch-up protection when failure transformer.
Though magnetizing inrush current does not have Mathematical Modeling statement accurately, it observes certain law jointly, that is:
1, magnetizing inrush current only exists in the short a period of time after dropping into transformer; So situation three, four of situations are effective at the appointed time;
2, magnetizing inrush current can be not infinitely great, moment, maximum was no more than the several times of transformer rated current, concrete multiple and transformer capacity, factors such as structure are relevant, but to a concrete transformer is confirmable, so can being set, a maximum magnetizing inrush current current value (maximum magnetizing inrush current current value is set, need to consider certain surplus, just should want big by maximum magnetizing inrush current current value, concrete value oneself is determined before use by the user, mode by fixed value adjusting enters the program setting), and short circuit current may be bigger than this maximum magnetizing inrush current current value, surpass maximum magnetizing inrush current current value and just think and be not magnetizing inrush current, do not satisfy barring condition.
3, can reach peak value in the short time at the utmost point after magnetizing inrush current produces, decay rapidly subsequently, the rate of decay slows down gradually, so can be arranged on the maximum magnetizing inrush current value of each time point possibility in this process according to this rule, and short circuit can not decay, surpass predefined corresponding current value constantly and (corresponding current value constantly is set, consider certain surplus, just want big, concrete value oneself is determined before use by the user, mode by fixed value adjusting enters the program setting), just think not to be magnetizing inrush current, do not satisfy barring condition.
When 4, dropping failure transformer, existing magnetizing inrush current also has fault current, transformer drops into after-current also first big after small phenomenon may occur, but transformer drops into current maxima may be greater than maximum magnetizing inrush current current value, its attenuation amplitude also is much smaller than magnetizing inrush current, and situation three and situation four are set in program, can discern this situation, not locking, the tripping failure transformer.
Claims (2)
1. method of discerning transformer excitation flow and avoiding the transformer differential protection malfunction, concrete step is as described below:
1), at first, the transformer self check, and judge that self-detection result whether in the normal condition scope, is all normally as self-detection result, enter step 2); There is improper situation as self-detection result, enters step 8);
2), transformer is by set point input protection, then, enters step 3);
3), transformer both sides electric current, information of voltage are gathered, enter step 4) afterwards;
4), the electric current, the information of voltage that obtain according to step 3) judge the current default tranformer protection entry condition that whether satisfies, if satisfy, enters step 5), if do not satisfy, returns step 3);
5), the electric current, the information of voltage that obtain according to step 3) judge the current default transformer fault condition that whether satisfies, if satisfy, enters step 6), if do not satisfy, returns step 3);
6), the electric current that obtains according to step 3), information of voltage are judged the condition of each input of current whether locking transformer, outlet side switch, if satisfy the condition of each input of locking transformer, outlet side switch, return step 3), if do not satisfy the condition of each input of locking transformer, outlet side switch, enter step 7);
7), carry out actions such as tripping operation, alarm;
8), improper self-detection result information is alarmed; Afterwards, enter step 9);
9), judged whether slot signal, if having, return step 1), if do not have, return step 8);
It is characterized in that: the concrete grammar of " judging the current condition that whether satisfies each input of default locking transformer, outlet side switch " in the step 6) is: following arbitrary situation takes place, promptly be judged as the condition that does not satisfy each input of default locking transformer, outlet side switch:
Situation one: after protection started, each side current value of transformer did not all reduce phenomenon;
Situation two: when protection started, transformation had a high regard for the both sides electric current greater than default the stream threshold value to be arranged.
2. identification transformer excitation flow as claimed in claim 1 is also avoided the method for transformer differential protection malfunction; it is characterized in that: in the concrete grammar of " judging the current condition that whether satisfies each input of default locking transformer, outlet side switch " in the described step 6): be judged as the condition that does not satisfy each input of default locking transformer, outlet side switch, also comprise following arbitrary situation:
Situation three), protection starts in the stipulated time of back, transformer either side lowest high-current value is greater than predefined maximum magnetizing inrush current current value;
Situation four), protection starts on arbitrary moment point in the stipulated time of back, transformer either side current value is greater than predefined corresponding current value constantly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110154845.2A CN102222880B (en) | 2011-06-10 | 2011-06-10 | Method for identifying inrush exciting current of transformer and avoiding differential protection maloperation of transformer |
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| CN201110154845.2A CN102222880B (en) | 2011-06-10 | 2011-06-10 | Method for identifying inrush exciting current of transformer and avoiding differential protection maloperation of transformer |
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| CN102222880A true CN102222880A (en) | 2011-10-19 |
| CN102222880B CN102222880B (en) | 2014-07-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914722A (en) * | 2012-11-19 | 2013-02-06 | 山东电力集团公司电力科学研究院 | Detection method for seeking reasons of misoperation trip during transformer differential protection power transfer |
| CN103001181A (en) * | 2012-11-19 | 2013-03-27 | 山东电力集团公司电力科学研究院 | Method for solving false action of differential protection when power transfer of transformer |
| CN108400613A (en) * | 2018-02-05 | 2018-08-14 | 国电南瑞科技股份有限公司 | Generator opens machine process recognition methods with phase modifier during electric system is grid-connected |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002093710A1 (en) * | 2001-05-17 | 2002-11-21 | Yong-Cheol Kang | Relaying method for protecting a transformer using a difference of current |
| CN102055173A (en) * | 2010-12-08 | 2011-05-11 | 河南省电力公司许昌供电公司 | Method for preventing differential protection false operation caused by exciting inrush current of no-load transformer |
-
2011
- 2011-06-10 CN CN201110154845.2A patent/CN102222880B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002093710A1 (en) * | 2001-05-17 | 2002-11-21 | Yong-Cheol Kang | Relaying method for protecting a transformer using a difference of current |
| CN102055173A (en) * | 2010-12-08 | 2011-05-11 | 河南省电力公司许昌供电公司 | Method for preventing differential protection false operation caused by exciting inrush current of no-load transformer |
Non-Patent Citations (1)
| Title |
|---|
| 赖燕妮: "浅谈励磁涌流与变压器保护的关系", 《水电站机电技术》, no. 4, 31 August 1998 (1998-08-31), pages 48 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914722A (en) * | 2012-11-19 | 2013-02-06 | 山东电力集团公司电力科学研究院 | Detection method for seeking reasons of misoperation trip during transformer differential protection power transfer |
| CN103001181A (en) * | 2012-11-19 | 2013-03-27 | 山东电力集团公司电力科学研究院 | Method for solving false action of differential protection when power transfer of transformer |
| CN103001181B (en) * | 2012-11-19 | 2014-12-10 | 山东电力集团公司电力科学研究院 | Method for solving false action of differential protection when power transfer of transformer |
| CN108400613A (en) * | 2018-02-05 | 2018-08-14 | 国电南瑞科技股份有限公司 | Generator opens machine process recognition methods with phase modifier during electric system is grid-connected |
| CN108400613B (en) * | 2018-02-05 | 2021-07-02 | 国电南瑞科技股份有限公司 | Method for identifying startup process of generator and phase modulator in power system grid connection process |
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| CN102222880B (en) | 2014-07-16 |
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