CN107240904A - The recognition methods of inrush current of transformer and device - Google Patents
The recognition methods of inrush current of transformer and device Download PDFInfo
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- CN107240904A CN107240904A CN201710584371.2A CN201710584371A CN107240904A CN 107240904 A CN107240904 A CN 107240904A CN 201710584371 A CN201710584371 A CN 201710584371A CN 107240904 A CN107240904 A CN 107240904A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/045—Differential protection of transformers
- H02H7/0455—Differential protection of transformers taking into account saturation of current transformers
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- Power Engineering (AREA)
- Protection Of Transformers (AREA)
Abstract
The invention discloses a kind of recognition methods of inrush current of transformer and device.Wherein, this method includes：Obtain that the first moment being mutated occurs in the first side line electric current and the second moment being mutated occurs in spill current；Detect whether the second side line electric current is mutated at the first moment, and the first moment and the second moment it is whether identical；If the second side line electric current is detected not to be mutated at the first moment, and the first moment and the second moment differ, it is determined that transformer occurs and echo surge current.The present invention solves the low technical problem of the degree of accuracy that the recognition methods pair of inrush current of transformer of the prior art and echo surge current be identified.
Description
Technical field
The present invention relates to field transformer, recognition methods and device in particular to a kind of inrush current of transformer.
Background technology
Differential protection is the main protection of power transformer interior fault, the side of outstanding problem one of transformer differential protection in force
Face is how to distinguish excitation surge current and fault current, is on the other hand how to distinguish internal fault and external fault.But, utilize
Existing inrush current of transformer identical criterion, will cause differential protection malfunction, when a transformer during no-load closing, will be with other phase
Produce and should act between the in parallel or cascade transformer that neighbour is currently running, will be produced and echo surge current in transformer, the appearance of shoving
Easily cause current transformer TA transient state saturations, reduce 2 subharmonic contents in spill current, cause 2 traditional subharmonic lockings to be gushed
Criterion failure is flowed, so as to cause the maloperation of normal operating transformer differential protection, normally runs and is brought very to main equipment
Big harm.
Generation form with echo surge current is various, and during formation and echo surge current, due to operating transformer
Itself is without failure, and malfunction occurs after adjacent transformers air-drop completes a period of time, so it is difficult to finding out reason of false action, by mistake
Dynamic reason is with more disguise；And existing research is found, conventional excitation surge current criterion is mostly unsuitable to be used as judgement
With the foundation of echo surge current.
The degree of accuracy that recognition methods pair and echo surge current for inrush current of transformer of the prior art are identified is low to ask
Topic, not yet proposes effective solution at present.
The content of the invention
The embodiments of the invention provide a kind of recognition methods of inrush current of transformer and device, at least to solve in the prior art
Inrush current of transformer recognition methods pair and the low technical problem of the degree of accuracy that is identified of echo surge current.
One side according to embodiments of the present invention there is provided a kind of recognition methods of inrush current of transformer, including：Obtain the
There is the first moment being mutated in side line current and the second moment being mutated occurs in spill current；Detect the second side line electric current first
Whether the moment is mutated, and the first moment and the second moment it is whether identical；If detecting the second side line electric current first
Moment is not mutated, and the first moment and the second moment differ, it is determined that transformer occurs and echo surge current.
Further, it is determined that transformer occurs with after echo surge current, the above method also includes：Detect the second side line electric current
Whether it is mutated after the first moment；If detecting the second side line electric current not to be mutated after the first moment,
Determine that transformer only occurs and echo surge current；If detecting the second side line electric current to be mutated after the first moment, it is determined that
Transformer breaks down during generation and echo surge current.
Further, it is mutated if detecting the second side line electric current after the first moment, the above method also includes：
Obtain the second side line electric current and the 3rd moment being mutated occur；Detect whether the second moment is identical with the 3rd moment；If when second
Carve identical with the 3rd moment, it is determined that during generation and echo surge current internal fault occurs for transformer；If the second moment and the
Three moment are different, it is determined that external fault, and current transformer transient state saturation occur during generation and echo surge current for transformer.
Further, it is not mutated at the first moment if detecting the second side line electric current, and the first moment and second
Moment is identical, it is determined that excitation surge current occurs for transformer, or transformer is dropped in internal fault.
Further, it is mutated if detecting the second side line electric current at the first moment, and when the first moment and second
Carve identical, it is determined that internal fault occurs for transformer.
Further, it is mutated if detecting the second side line electric current at the first moment, and when the first moment and second
Quarter differs, it is determined that external fault occurs for transformer.
Another aspect according to embodiments of the present invention, additionally provides a kind of identifying device of inrush current of transformer, including：First
Acquisition module, for obtaining, there is the first moment being mutated in the first side line electric current and the second moment being mutated occurs in spill current；The
One detection module, for detecting whether the second side line electric current is mutated at the first moment, and the first moment and the second moment
It is whether identical；First determining module, if it is not mutated at the first moment for detecting the second side line electric current, and when first
Carve and the second moment differed, it is determined that transformer occurs and echo surge current.
Further, said apparatus also includes：Second detection module, for detect the second side line electric current the first moment it
Whether it is mutated afterwards；Second determining module, if do not dashed forward after the first moment for detecting the second side line electric current
Become, it is determined that transformer only occurs and echo surge current；3rd determining module, if for detecting the second side line electric current at first
It is mutated after quarter, it is determined that transformer breaks down during generation and echo surge current.
Further, said apparatus also includes：Second acquisition module, if for detecting the second side line electric current first
It is mutated after moment, then obtains the second side line electric current and the 3rd moment being mutated occur；3rd detection module, for detecting the
Whether two moment are identical with the 3rd moment；4th determining module, if identical with the 3rd moment for the second moment, it is determined that become
During generation and echo surge current internal fault occurs for depressor；5th determining module, if for the second moment and the 3rd moment not
Together, it is determined that external fault, and current transformer transient state saturation occur during generation and echo surge current for transformer.
Further, said apparatus also includes：6th determining module, if for detecting the second side line electric current first
Moment is not mutated, and the first moment is identical with the second moment, it is determined that excitation surge current, or transformer air-drop occur for transformer
In internal fault.
Further, said apparatus also includes：7th determining module, if for detecting the second side line electric current first
Moment is mutated, and the first moment is identical with the second moment, it is determined that internal fault occurs for transformer.
Further, said apparatus also includes：8th determining module, if for detecting the second side line electric current first
Moment is mutated, and the first moment and the second moment differ, it is determined that external fault occurs for transformer.
Another aspect according to embodiments of the present invention, additionally provides a kind of storage medium, and storage medium includes the journey of storage
Sequence, wherein, equipment where controlling storage medium when program is run performs the identification side of the inrush current of transformer in above-described embodiment
Method.
Another aspect according to embodiments of the present invention, additionally provides a kind of processor, and processor is used for operation program, its
In, program performs the recognition methods of the inrush current of transformer in above-described embodiment when running.
In embodiments of the present invention, there is the first moment being mutated in the first side line electric current of acquisition and spill current occurs what is be mutated
Whether the second moment, the second side line electric current of detection is mutated at the first moment, and the first moment and the second moment whether phase
Together, it is not mutated at the first moment if detecting the second side line electric current, and the first moment and the second moment differ, then really
Determine transformer to occur and echo surge current, so as to realize that to transformer and echo surge current is identified.It is easily noted that, due to that can lead to
Spend the mutation moment of detection Y side line electric currents and the mutation moment of spill current whether there is error, and combine detection △ side line electric currents
Whether be mutated at the first moment, pair and echo surge current correctly recognized, gushed so as to solve transformer of the prior art
The low technical problem of the degree of accuracy that the recognition methods pair of stream and echo surge current are identified.Therefore, the above embodiment of the present invention is passed through
The scheme of offer, the technology that can be reached that identification process is simple, recognition speed is fast, reliability is high and not influenceed by TA saturations
Effect.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is a kind of flow chart of the recognition methods of inrush current of transformer according to embodiments of the present invention；
Fig. 2 (a) is the schematic diagram that in parallel and echo surge current occurs for a kind of 2 transformers according to embodiments of the present invention；
Fig. 2 (b) is the schematic diagram that cascade and echo surge current occur for a kind of 2 transformers according to embodiments of the present invention；
Fig. 3 is a kind of flow chart of the recognition methods of optional inrush current of transformer according to embodiments of the present invention；And
Fig. 4 is a kind of schematic diagram of the identifying device of inrush current of transformer according to embodiments of the present invention.
Embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model that the present invention is protected
Enclose.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so using
Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating herein or
Order beyond those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
Lid is non-exclusive to be included, for example, the process, method, system, product or the equipment that contain series of steps or unit are not necessarily limited to
Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product
Or the intrinsic other steps of equipment or unit.
Embodiment 1
According to embodiments of the present invention there is provided a kind of embodiment of the recognition methods of inrush current of transformer, it is necessary to explanation,
It can be performed the step of the flow of accompanying drawing is illustrated in the computer system of such as one group computer executable instructions, and
And, although logical order is shown in flow charts, but in some cases, can be with different from order execution institute herein
The step of showing or describe.
Fig. 1 is a kind of flow chart of the recognition methods of inrush current of transformer according to embodiments of the present invention, as shown in figure 1, should
Method comprises the following steps：
Step S102, obtains the first side line electric current and the first moment being mutated occurs and when spill current occurs be mutated second
Carve.
Specifically, the first above-mentioned side line electric current can be Y side line electric currents.
Whether step S104, the second side line electric current of detection is mutated at the first moment, and when the first moment and second
Whether identical carve.
Specifically, the second above-mentioned side line electric current can be △ side line electric currents.
Step S106, is not mutated if detecting the second side line electric current at the first moment, and the first moment and second
Moment differs, it is determined that transformer occurs and echo surge current.
It should be noted that 2 transformers that Fig. 2 (a) or such as Fig. 2 (b) give two kinds of connected modes occur and should gushed
The schematic diagram of stream, in Fig. 2 (a) or such as Fig. 2 (b), T1 is operating transformer, and T2 is combined floodgate transformer, Rs、LsFor resistance and electricity
Sense, isTo flow through the electric current of resistance, i1、i2To flow through transformer T1 and T2 Y side line electric currents.With the wiring feelings as shown in Fig. 2 (a)
Exemplified by condition, when transformer T2 idle-loaded switching-ons produce excitation surge current, difference current occurs simultaneously with Y side lines electric current, in the absence of the time
Difference, and because △ sides are unloaded, △ side lines electric current is always 0, is not changed；And in the case of with echo surge current, T2 zero loads are closed
When lock produces excitation surge current, circulation can be produced in T1, the circulation can cause T1 Y side lines electric current to increase, and now spill current
It is approximately 0, until producing and echo surge current, spill current is just significantly increased, therefore, T1 Y side lines current break and spill current are mutated
It is that the differentiation with echo surge current can be achieved using the time difference in the presence of the obvious time difference.
In a kind of optional scheme, Y side line electric currents can be obtained and the first moment t being mutated occurY1Occur with spill current
Second moment t of mutationd1, detection △ side lines electric current is in the first moment tY1Whether it is mutated, if △ side line electric currents are first
Moment tY1It is not mutated, it is determined that internal fault or external fault do not occur for transformer, further the first moment t of detectionY1With
There is the second moment t being mutated in spill currentd1With the presence or absence of the time difference, that is, judge the first moment tY1With the second moment td1It is whether identical,
If there is the time difference, i.e. the first moment tY1With the second moment td1It is different, it is determined that transformer occur and echo surge current or with should gush
Occurs internal and external fault during miscarriage is raw.
It should also be noted that, not considering in the above embodiment of the present invention because the line currents caused by reason such as disturbance are dashed forward
Become, it is as the inside and outside portion's failure of transformer, excitation surge current or caused by with 4 kinds of situations of echo surge current to determine Y side line current breaks.
According to the above embodiment of the present invention, the first side line electric current of acquisition the first moment being mutated occurs and spill current is dashed forward
Whether the second moment become, the second side line electric current of detection is mutated at the first moment, and the first moment and the second moment are
It is no identical, it is not mutated at the first moment if detecting the second side line electric current, and the first moment and the second moment differ,
Then determine that transformer occurs and echo surge current, so as to realize that to transformer and echo surge current is identified.It is easily noted that, due to can
To detect △ side lines by detecting that the mutation moment of Y side line electric currents and the mutation moment of spill current whether there is error, and combining
Whether electric current is mutated at the first moment, pair and echo surge current correctly recognized, so as to solve transformation of the prior art
The low technical problem of the degree of accuracy that the recognition methods pair and echo surge current that device shoves are identified.Therefore, above-mentioned reality of the invention is passed through
The scheme of example offer is provided, can reach that identification process is simple, recognition speed is fast, reliability is high and not influenceed by TA saturations
Technique effect.
Alternatively, in the above embodiment of the present invention, in step S106, determine that transformer occurs, with after echo surge current, to be somebody's turn to do
Method also comprises the following steps：
Whether step S108, the second side line electric current of detection is mutated after the first moment.
Step S110, is not mutated, it is determined that transformer if detecting the second side line electric current after the first moment
Only occur and echo surge current.
Step S112, is mutated, it is determined that transformer exists if detecting the second side line electric current after the first moment
Occur to break down during with echo surge current.
It should be noted that because the time difference of generation and echo surge current from T2 idle-loaded switching-on to T1 is larger, T1 has during this period
May occur inside and outside portion's failure, when occurring internal fault during being produced with echo surge current, can now detect Y side lines
Current break goes out the time difference of current moment with spill current, if Blocking Differential Protection can be missed by carrying out judgement according only to a time difference method,
When inside and outside portion's failure occurring during being produced with echo surge current, Y side lines current break and the same satisfaction of spill current mutation of transformer
The characteristics of when occurring inside and outside portion's failure merely, time difference method can be reused and judged, due to producing and there is ring during echo surge current
Stream, the Y side lines current break now detected can be affected, but Y sides and △ side lines electricity during inside and outside portion's failure occur for transformer
Stream can undergo mutation simultaneously, now can be by judging the mutation moment of △ side line electric currents and the mutation moment of spill current whether there is the time difference
To come distinguish simple and echo surge current with and echo surge current generation during occur the situation of inside and outside portion's failure.
In a kind of optional scheme, it is determined that transformer occurs and echo surge current or the generation during being produced with echo surge current
After internal and external fault, can further it detect in the first moment tY1Whether △ side lines electric current is mutated afterwards, if do not occurred
Mutation, it is determined that transformer only occurs and echo surge current；If there is mutation, it is determined that the generation phase with echo surge current occurs for transformer
Between occur internal or external failure.
Alternatively, in the above embodiment of the present invention, occur if detecting the second side line electric current after the first moment
Mutation, this method also comprises the following steps：
Step S114, obtains the second side line electric current and the 3rd moment being mutated occurs.
Whether step S116, the second moment of detection is identical with the 3rd moment.
Step S118, if the second moment is identical with the 3rd moment, it is determined that transformer is sent out during generation and echo surge current
Raw internal fault.
Step S120, if the second moment is different from the 3rd moment, it is determined that transformer is sent out during generation and echo surge current
Raw external fault, and current transformer transient state saturation.
It should be noted that when inside and outside portion's failure occurring during being produced with echo surge current, can be by judging △ side lines electricity
Stream whether there is the time difference with spill current mutation.
In a kind of optional scheme, it is determined that internal or external event occurs during the generation with echo surge current occurs for transformer
After barrier, it can further obtain △ side line electric currents and the 3rd moment t being mutated occur△1, and detect the 3rd moment t△1During with second
Carve td1With the presence or absence of the time difference, that is, judge the 3rd moment t△1With the second moment td1It is whether identical, if there is no the time difference, i.e., the 3rd
Moment t△1With the second moment td1It is identical, it is determined that internal fault occurs during being produced with echo surge current for transformer；If there is when
Difference, i.e. the 3rd moment t△1With the second moment td1It is different, it is determined that external fault occurs during being produced with echo surge current for transformer,
And TA saturations (Y sides are applicable with △ sides TA saturations).
Alternatively, in the above embodiment of the present invention, do not dashed forward at the first moment if detecting the second side line electric current
Become, and the first moment is identical with the second moment, it is determined that excitation surge current occurs for transformer, or transformer is dropped in internal fault.
It should be noted that when transformer generation and echo surge current are with excitation surge current, during combined floodgate there is mutation in Y side lines electric current,
Mutation is not present in △ side lines electric current, and the time difference is not present with spill current mutation in Y side lines current break.In a kind of optional scheme
In,
Y side line electric currents can be obtained and the first moment t being mutated occurY1There is the second moment t being mutated with spill currentd1, inspection
△ side lines electric current is surveyed in the first moment tY1Whether it is mutated, if △ side lines electric current is in the first moment tY1It is not mutated, then
Determine that internal fault or external fault do not occur for transformer, further the first moment t of detectionY1Occur be mutated second with spill current
Moment td1With the presence or absence of the time difference, that is, judge the first moment tY1With the second moment td1It is whether identical, if there is no the time difference, i.e.,
One moment tY1With the second moment td1It is identical, it is determined that excitation surge current occurs for transformer, or transformer is dropped in internal fault.
Alternatively, in the above embodiment of the present invention, it is mutated if detecting the second side line electric current at the first moment,
And first the moment it is identical with the second moment, it is determined that transformer occur internal fault.
It should be noted that transformer is when occurring internal fault, it is linear in the TA at failure initial stage even if there are TA saturations
Progress of disease period, line current change is theoretically while occurring, in the absence of the time difference with spill current.And in transformer external fault
When, both just occurred very serious passing through property failure, TA also will not saturation immediately, in linear transform area, TA can correctly transmit one
Secondary side electric current, spill current is 0.Therefore, even if TA is rapidly saturated, occur to the time interval for producing difference current to remain unchanged from failure
In the presence of.Therefore, the time difference can distinguish the criterion of inside and outside failure as differential protection.
In a kind of optional scheme, Y side line electric currents can be obtained and the first moment t being mutated occurY1Occur with spill current
Second moment t of mutationd1, detection △ side lines electric current is in the first moment tY1Whether it is mutated, if △ side line electric currents are first
Moment tY1It is mutated, it is determined that internal fault or external fault occur for transformer, can further detect the first moment tY1With
There is the second moment t being mutated in spill currentd1With the presence or absence of the time difference, that is, judge the first moment tY1With the second moment td1It is whether identical,
If there is no the time difference, i.e. the first moment tY1With the second moment td1It is identical, it is determined that internal fault occurs for transformer.
Alternatively, in the above embodiment of the present invention, it is mutated if detecting the second side line electric current at the first moment,
And first moment and the second moment differ, it is determined that external fault occurs for transformer.
In a kind of optional scheme, Y side line electric currents can be obtained and the first moment t being mutated occurY1Occur with spill current
Second moment t of mutationd1, detection △ side lines electric current is in the first moment tY1Whether it is mutated, if △ side line electric currents are first
Moment tY1It is mutated, it is determined that internal fault or external fault occur for transformer, can further detect the first moment tY1With
There is the second moment t being mutated in spill currentd1With the presence or absence of the time difference, that is, judge the first moment tY1With the second moment td1It is whether identical,
If there is the time difference, i.e. the first moment tY1With the second moment td1It is different, it is determined that external fault occurs for transformer.
Fig. 3 is a kind of flow chart of the recognition methods of optional inrush current of transformer according to embodiments of the present invention, is tied below
Close Fig. 3 a kind of preferred embodiment of the invention is described in detail, as shown in figure 3, this method may include steps of：
Step S31, obtains the mutation moment t of Y side line electric currentsY1With the mutation moment t of spill currentd1。
It is alternatively possible to detect transformer T1 Y side lines electric current and the mutation moment of spill current, t is designated as respectivelyY1、td1。
Step S32, detects tY1Whether moment △ side line electric current is mutated.
It is alternatively possible in tY1Whether moment detection △ side lines electric current is mutated, and goes out if detecting △ side line electric currents
Now it is mutated, then into step S33, determines that internal fault or external fault occur for transformer；If detecting △ side lines electric current not
It is mutated, then into step S34.
Step S33, determines that internal fault or external fault occur for transformer.
It is alternatively possible to which fault type is identified using time difference method, that is, judge tY1Moment and td1Moment whether there is
The time difference, if there is the time difference, it is determined that external fault occurs for transformer；If there is no the time difference, it is determined that in transformer occurs
Portion's failure.
Step S34, judges tY1Moment and td1Moment whether there is the time difference.
Alternatively, detecting after △ side lines electric current do not occur mutation, then can determine whether tY1Moment and td1When
Carve and whether there is the time difference, if there is no the time difference, then into step S35, determine that excitation surge current occurs for transformer or transformer is empty
Throw in internal fault；If there is the time difference, then into step S36, determine transformer generation and echo surge current or produced with echo surge current
Inside and outside portion's failure occurs during life.
Step S35, determines that excitation surge current occurs in transformer or transformer is dropped in internal fault.
Step S36, detects tY1Whether △ side lines electric current is mutated after moment.
Alternatively, it is determined that transformer occurs that inside and outside portion's failure occurs with echo surge current or during being produced with echo surge current
Afterwards, t can further be detectedY1Whether △ side lines electric current is mutated after moment, if be not mutated, into step
S37, determines that transformer only occurs and echo surge current；If there is mutation, then into step S38.
Step S37, determines that transformer only occurs and echo surge current.
Step S38, obtains t at the time of △ side line electric currents are mutated△1。
Step S39, judges t△1Moment and td1Moment whether there is the time difference.
Alternatively, it is determined that tY1After mutation occurs in △ side lines electric current after moment, the appearance of △ side lines electric current can be obtained
T at the time of mutation△1, and judge t△1Moment and td1Moment whether there is the time difference, if there is the time difference, then into step S310,
Determine that external fault and TA saturations occur during being produced with echo surge current for transformer；If there is no the time difference, then into step
S311, determines that internal fault occurs during being produced with echo surge current for transformer.
Step S310, determines that external fault and TA saturations occur during being produced with echo surge current for transformer.
Step S311, determines that internal fault occurs during being produced with echo surge current for transformer.
By above-mentioned steps, to prevent and differential protection malfunction caused by echo surge current, it is contemplated that and echo surge current produces process
In inside and outside portion's failure may occur again, can introduce whether △ side lines electric current is mutated as assistant criteria, and when utilizing twice
Poor method, can correctly distinguish various situations, it is contemplated that occur excitation surge current or transformer is dropped when internal fault, △ side line electric currents
It is not mutated, and Y side lines current break can be distinguished with spill current mutation in the absence of the time difference with above-mentioned various situations, Ran Houzai
Judged with existing method.The above method, which has, calculates simple, fast and reliable, the advantages of identification feature is obvious.
Embodiment 2
There is provided a kind of embodiment of the identifying device of inrush current of transformer according to embodiments of the present invention.
Fig. 4 is a kind of schematic diagram of the identifying device of inrush current of transformer according to embodiments of the present invention, as shown in figure 4, should
Device includes：
First acquisition module 41, for obtaining, there is the first moment being mutated in the first side line electric current and spill current is mutated
The second moment.
Specifically, the first above-mentioned side line electric current can be Y side line electric currents.
First detection module 43, for detecting whether the second side line electric current is mutated at the first moment, and when first
Carve and whether the second moment is identical.
Specifically, the second above-mentioned side line electric current can be △ side line electric currents.
First determining module 45, if it is not mutated at the first moment for detecting the second side line electric current, and first
Moment and the second moment differ, it is determined that transformer occurs and echo surge current.
It should be noted that by taking the wiring condition as shown in Fig. 2 (a) as an example, transformer T2 idle-loaded switching-ons produce excitation surge current
When, difference current occurs simultaneously with Y side lines electric current, in the absence of the time difference, and because △ sides are unloaded, △ side line electric currents are always
0, do not change；And in the case of with echo surge current, when T2 idle-loaded switching-ons produce excitation surge current, circulation can be produced in T1, should
Circulation can cause T1 Y side lines electric current to increase, and now spill current is approximately 0, until producing and echo surge current, spill current is just obvious
There is the obvious time difference with spill current mutation in increase, therefore, T1 Y side lines current break, using the time difference be can be achieved and
The differentiation of echo surge current.
In a kind of optional scheme, Y side line electric currents can be obtained and the first moment t being mutated occurY1Occur with spill current
Second moment t of mutationd1, detection △ side lines electric current is in the first moment tY1Whether it is mutated, if △ side line electric currents are first
Moment tY1It is not mutated, it is determined that internal fault or external fault do not occur for transformer, further the first moment t of detectionY1With
There is the second moment t being mutated in spill currentd1With the presence or absence of the time difference, that is, judge the first moment tY1With the second moment td1It is whether identical,
If there is the time difference, i.e. the first moment tY1With the second moment td1It is different, it is determined that transformer occur and echo surge current or with should gush
Occurs internal and external fault during miscarriage is raw.
It should also be noted that, not considering in the above embodiment of the present invention because the line currents caused by reason such as disturbance are dashed forward
Become, it is as the inside and outside portion's failure of transformer, excitation surge current or caused by with 4 kinds of situations of echo surge current to determine Y side line current breaks.
According to the above embodiment of the present invention, the first side line electric current of acquisition the first moment being mutated occurs and spill current is dashed forward
Whether the second moment become, the second side line electric current of detection is mutated at the first moment, and the first moment and the second moment are
It is no identical, it is not mutated at the first moment if detecting the second side line electric current, and the first moment and the second moment differ,
Then determine that transformer occurs and echo surge current, so as to realize that to transformer and echo surge current is identified.It is easily noted that, due to can
To detect △ side lines by detecting that the mutation moment of Y side line electric currents and the mutation moment of spill current whether there is error, and combining
Whether electric current is mutated at the first moment, pair and echo surge current correctly recognized, so as to solve transformation of the prior art
The low technical problem of the degree of accuracy that the recognition methods pair and echo surge current that device shoves are identified.Therefore, above-mentioned reality of the invention is passed through
The scheme of example offer is provided, can reach that identification process is simple, recognition speed is fast, reliability is high and not influenceed by TA saturations
Technique effect.
Alternatively, in the above embodiment of the present invention, the device also includes：Second detection module, for detecting the second side
Whether line current is mutated after the first moment；Second determining module, if for detecting the second side line electric current
It is not mutated after one moment, it is determined that transformer only occurs and echo surge current；3rd determining module, if for detecting
Two side line electric currents are mutated after the first moment, it is determined that transformer breaks down during generation and echo surge current.
It should be noted that because the time difference of generation and echo surge current from T2 idle-loaded switching-on to T1 is larger, T1 has during this period
May occur inside and outside portion's failure, when occurring internal fault during being produced with echo surge current, can now detect Y side lines
Current break goes out the time difference of current moment with spill current, if Blocking Differential Protection can be missed by carrying out judgement according only to a time difference method,
When inside and outside portion's failure occurring during being produced with echo surge current, Y side lines current break and the same satisfaction of spill current mutation of transformer
The characteristics of when occurring inside and outside portion's failure merely, time difference method can be reused and judged, due to producing and there is ring during echo surge current
Stream, the Y side lines current break now detected can be affected, but Y sides and △ side lines electricity during inside and outside portion's failure occur for transformer
Stream can undergo mutation simultaneously, now can be by judging the mutation moment of △ side line electric currents and the mutation moment of spill current whether there is the time difference
To come distinguish simple and echo surge current with and echo surge current generation during occur the situation of inside and outside portion's failure.
In a kind of optional scheme, it is determined that transformer occurs and echo surge current or the generation during being produced with echo surge current
After internal and external fault, can further it detect in the first moment tY1Whether △ side lines electric current is mutated afterwards, if do not occurred
Mutation, it is determined that transformer only occurs and echo surge current；If there is mutation, it is determined that the generation phase with echo surge current occurs for transformer
Between occur internal or external failure.
Alternatively, in the above embodiment of the present invention, the device also includes：Second acquisition module, if for detecting
Second side line electric current is mutated after the first moment, obtains the second side line electric current and the 3rd moment being mutated occurs；3rd inspection
Module is surveyed, for detecting whether the second moment is identical with the 3rd moment；4th determining module, if for the second moment and the 3rd
Moment is identical, it is determined that during generation and echo surge current internal fault occurs for transformer；5th determining module, if for second
Moment is different from the 3rd moment, it is determined that external fault occurs during generation and echo surge current for transformer, and current transformer is temporary
State saturation.
It should be noted that when inside and outside portion's failure occurring during being produced with echo surge current, can be by judging △ side lines electricity
Stream whether there is the time difference with spill current mutation.
In a kind of optional scheme, it is determined that internal or external event occurs during the generation with echo surge current occurs for transformer
After barrier, it can further obtain △ side line electric currents and the 3rd moment t being mutated occur△1, and detect the 3rd moment t△1During with second
Carve td1With the presence or absence of the time difference, that is, judge the 3rd moment t△1With the second moment td1It is whether identical, if there is no the time difference, i.e., the 3rd
Moment t△1With the second moment td1It is identical, it is determined that internal fault occurs during being produced with echo surge current for transformer；If there is when
Difference, i.e. the 3rd moment t△1With the second moment td1It is different, it is determined that external fault occurs during being produced with echo surge current for transformer,
And TA saturations (Y sides are applicable with △ sides TA saturations).
Alternatively, in the above embodiment of the present invention, the device also includes：6th determining module, if for detecting
Second side line electric current is not mutated at the first moment, and the first moment is identical with the second moment, it is determined that transformer is encouraged
Magnetic is shoved, or transformer is dropped in internal fault.
It should be noted that when transformer generation and echo surge current are with excitation surge current, during combined floodgate there is mutation in Y side lines electric current,
Mutation is not present in △ side lines electric current, and the time difference is not present with spill current mutation in Y side lines current break.In a kind of optional scheme
In,
Y side line electric currents can be obtained and the first moment t being mutated occurY1There is the second moment t being mutated with spill currentd1, inspection
△ side lines electric current is surveyed in the first moment tY1Whether it is mutated, if △ side lines electric current is in the first moment tY1It is not mutated, then
Determine that internal fault or external fault do not occur for transformer, further the first moment t of detectionY1Occur be mutated second with spill current
Moment td1With the presence or absence of the time difference, that is, judge the first moment tY1With the second moment td1It is whether identical, if there is no the time difference, i.e.,
One moment tY1With the second moment td1It is identical, it is determined that excitation surge current occurs for transformer, or transformer is dropped in internal fault.
Alternatively, in the above embodiment of the present invention, the device also includes：7th determining module, if for detecting
Second side line electric current is mutated at the first moment, and the first moment is identical with the second moment, it is determined that transformer occurs internal
Failure.
It should be noted that transformer is when occurring internal fault, it is linear in the TA at failure initial stage even if there are TA saturations
Progress of disease period, line current change is theoretically while occurring, in the absence of the time difference with spill current.And in transformer external fault
When, both just occurred very serious passing through property failure, TA also will not saturation immediately, in linear transform area, TA can correctly transmit one
Secondary side electric current, spill current is 0.Therefore, even if TA is rapidly saturated, occur to the time interval for producing difference current to remain unchanged from failure
In the presence of.Therefore, the time difference can distinguish the criterion of inside and outside failure as differential protection.
In a kind of optional scheme, Y side line electric currents can be obtained and the first moment t being mutated occurY1Occur with spill current
Second moment t of mutationd1, detection △ side lines electric current is in the first moment tY1Whether it is mutated, if △ side line electric currents are first
Moment tY1It is mutated, it is determined that internal fault or external fault occur for transformer, can further detect the first moment tY1With
There is the second moment t being mutated in spill currentd1With the presence or absence of the time difference, that is, judge the first moment tY1With the second moment td1It is whether identical,
If there is no the time difference, i.e. the first moment tY1With the second moment td1It is identical, it is determined that internal fault occurs for transformer.
Alternatively, in the above embodiment of the present invention, the device also includes：8th determining module, if for detecting
Second side line electric current is mutated at the first moment, and the first moment and the second moment differ, it is determined that transformer occurs outer
Portion's failure.
In a kind of optional scheme, Y side line electric currents can be obtained and the first moment t being mutated occurY1Occur with spill current
Second moment t of mutationd1, detection △ side lines electric current is in the first moment tY1Whether it is mutated, if △ side line electric currents are first
Moment tY1It is mutated, it is determined that internal fault or external fault occur for transformer, can further detect the first moment tY1With
There is the second moment t being mutated in spill currentd1With the presence or absence of the time difference, that is, judge the first moment tY1With the second moment td1It is whether identical,
If there is the time difference, i.e. the first moment tY1With the second moment td1It is different, it is determined that external fault occurs for transformer.
Embodiment 3
According to embodiments of the present invention there is provided a kind of embodiment of storage medium, storage medium includes the program of storage, its
In, equipment where controlling storage medium when program is run performs the recognition methods of the inrush current of transformer in above-described embodiment 1.
Embodiment 4
According to embodiments of the present invention there is provided a kind of embodiment of processor, processor is used for operation program, wherein, journey
The recognition methods of the inrush current of transformer in above-described embodiment 1 is performed during sort run.
The embodiments of the present invention are for illustration only, and the quality of embodiment is not represented.
In the above embodiment of the present invention, the description to each embodiment all emphasizes particularly on different fields, and does not have in some embodiment
The part of detailed description, may refer to the associated description of other embodiment.
In several embodiments provided herein, it should be understood that disclosed technology contents, others can be passed through
Mode is realized.Wherein, device embodiment described above is only schematical, such as division of described unit, Ke Yiwei
A kind of division of logic function, can there is other dividing mode when actually realizing, such as multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual
Between coupling or direct-coupling or communication connection can be the INDIRECT COUPLING or communication link of unit or module by some interfaces
Connect, can be electrical or other forms.
The unit illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On unit.Some or all of unit therein can be selected to realize the purpose of this embodiment scheme according to the actual needs.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If the integrated unit is realized using in the form of SFU software functional unit and as independent production marketing or used
When, it can be stored in a computer read/write memory medium.Understood based on such, technical scheme is substantially
The part contributed in other words to prior art or all or part of the technical scheme can be in the form of software products
Embody, the computer software product is stored in a storage medium, including some instructions are to cause a computer
Equipment (can for personal computer, server or network equipment etc.) perform each embodiment methods described of the invention whole or
Part steps.And foregoing storage medium includes：USB flash disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can be with store program codes
Medium.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (14)
1. a kind of recognition methods of inrush current of transformer, it is characterised in that including：
Obtain that the first moment being mutated occurs in the first side line electric current and the second moment being mutated occurs in spill current；
Detect whether the second side line electric current is mutated at first moment, and first moment and second moment
It is whether identical；
If the second side line electric current is detected not to be mutated at first moment, and first moment and described
Two moment differed, it is determined that the transformer occurs and echo surge current.
2. according to the method described in claim 1, it is characterised in that it is determined that the transformer occur and echo surge current after, institute
Stating method also includes：
Detect whether the second side line electric current is mutated after first moment；
If detecting the second side line electric current not to be mutated after first moment, it is determined that the transformer is only
Occurs described and echo surge current；
If detecting the second side line electric current to be mutated after first moment, it is determined that the transformer is in hair
Broken down during raw described and echo surge current.
3. method according to claim 2, it is characterised in that if detecting the second side line electric current described first
It is mutated after moment, methods described also includes：
Obtain the second side line electric current and the 3rd moment being mutated occur；
Detect whether second moment is identical with the 3rd moment；
If second moment is identical with the 3rd moment, it is determined that the transformer is during occurring described and echo surge current
Generation internal fault；
If second moment is different from the 3rd moment, it is determined that the transformer is during occurring described and echo surge current
Generation external fault, and current transformer transient state saturation.
4. according to the method described in claim 1, it is characterised in that if detecting the second side line electric current described first
Moment is not mutated, and first moment is identical with second moment, it is determined that excitation surge current occurs for the transformer,
Or the transformer is dropped in internal fault.
5. according to the method described in claim 1, it is characterised in that if detecting the second side line electric current described first
Moment is mutated, and first moment is identical with second moment, it is determined that internal fault occurs for the transformer.
6. according to the method described in claim 1, it is characterised in that if detecting the second side line electric current described first
Moment is mutated, and first moment and second moment differ, it is determined that external fault occurs for the transformer.
7. a kind of identifying device of inrush current of transformer, it is characterised in that including：
First acquisition module, for obtaining, there is the first moment being mutated in the first side line electric current and spill current occurs be mutated second
Moment；
First detection module, for detecting whether the second side line electric current is mutated at first moment, and described first
Whether moment and second moment are identical；
First determining module, if it is not mutated at first moment for detecting the second side line electric current, and institute
Stated for the first moment and second moment differs, it is determined that the transformer occurs and echo surge current.
8. device according to claim 7, it is characterised in that described device also includes：
Second detection module, for detecting whether the second side line electric current is mutated after first moment；
Second determining module, if be not mutated after first moment for detecting the second side line electric current,
Then determine that described and echo surge current only occurs for the transformer；
3rd determining module, if be mutated for detecting the second side line electric current after first moment,
Determine that the transformer breaks down during occurring described and echo surge current.
9. device according to claim 8, it is characterised in that described device also includes：
Second acquisition module, if be mutated for detecting the second side line electric current after first moment,
Obtain the second side line electric current and the 3rd moment being mutated occur；
3rd detection module, for detecting whether second moment is identical with the 3rd moment；
4th determining module, if identical with the 3rd moment for second moment, it is determined that the transformer is in hair
Occurs internal fault during raw described and echo surge current；
5th determining module, if different from the 3rd moment for second moment, it is determined that the transformer is in hair
Occur external fault, and current transformer transient state saturation during raw described and echo surge current.
10. device according to claim 7, it is characterised in that described device also includes：
6th determining module, if it is not mutated at first moment for detecting the second side line electric current, and institute
Stated for the first moment identical with second moment, it is determined that excitation surge current occurs for the transformer, or the transformer drop in
Internal fault.
11. device according to claim 7, it is characterised in that described device also includes：
7th determining module, if it is mutated for detecting the second side line electric current at first moment, and it is described
First moment is identical with second moment, it is determined that internal fault occurs for the transformer.
12. device according to claim 7, it is characterised in that described device also includes：
8th determining module, if it is mutated for detecting the second side line electric current at first moment, and it is described
First moment and second moment differ, it is determined that external fault occurs for the transformer.
13. a kind of storage medium, it is characterised in that the storage medium includes the program of storage, wherein, in described program operation
When control the storage medium where inrush current of transformer in equipment perform claim requirement 1 to 6 described in any one identification side
Method.
14. a kind of processor, it is characterised in that the processor is used for operation program, wherein, right of execution when described program is run
Profit requires the recognition methods of the inrush current of transformer described in any one in 1 to 6.
Priority Applications (1)
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| CN201710584371.2A CN107240904A (en) | 2017-07-17 | 2017-07-17 | The recognition methods of inrush current of transformer and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710584371.2A CN107240904A (en) | 2017-07-17 | 2017-07-17 | The recognition methods of inrush current of transformer and device |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003199244A (en) * | 2001-12-25 | 2003-07-11 | Mitsubishi Electric Corp | Bus-bar protective relay |
| CN104538927A (en) * | 2015-01-19 | 2015-04-22 | 国家电网公司 | Recognition method for transformer saturation under condition of complex surge |
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2017
- 2017-07-17 CN CN201710584371.2A patent/CN107240904A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003199244A (en) * | 2001-12-25 | 2003-07-11 | Mitsubishi Electric Corp | Bus-bar protective relay |
| CN104538927A (en) * | 2015-01-19 | 2015-04-22 | 国家电网公司 | Recognition method for transformer saturation under condition of complex surge |
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| Title |
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| 谷君等: "基于时差法的Y/△接线变压器和应涌流鉴别新方法", 《中国电机工程学报》 * |
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