CN108173240A - A kind of transformer excitation flow recognition method and system based on compound time difference method - Google Patents
A kind of transformer excitation flow recognition method and system based on compound time difference method Download PDFInfo
- Publication number
- CN108173240A CN108173240A CN201711378082.3A CN201711378082A CN108173240A CN 108173240 A CN108173240 A CN 108173240A CN 201711378082 A CN201711378082 A CN 201711378082A CN 108173240 A CN108173240 A CN 108173240A
- Authority
- CN
- China
- Prior art keywords
- transformer
- closed loop
- loop region
- moment
- time difference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
Abstract
The invention discloses a kind of transformer excitation flow recognition method and system based on compound time difference method, method includes：S1, symmetrical region is divided into three closed loop regions, the first closed loop region, the second closed loop region and third closed loop region；S2, the poor rheology moment for calculating the first closed loop region, the second closed loop region and third closed loop region by time difference method respectively, and monitor the phase voltage variation moment of transformer；With the presence or absence of the time difference between S3, the phase voltage variation moment for judging the first closed loop region, the second closed loop region, the poor rheology moment in third closed loop region and transformer respectively, identify that excitation surge current, internal fault or transformer both ends CT saturation occur for transformer according to judging result.The beneficial effects of the invention are as follows：Comprehensive distinguishing result is to identify that the generation of excitation surge current, internal fault or transformer both ends CT saturation occurs for transformer.
Description
Technical field
The present invention relates to technical field of relay protection, more particularly to a kind of transformer excitation flow based on compound time difference method
Recognition methods and system.
Background technology
Current differential protection is since its principle is simple, quick action, the main protection being widely used as transformer.So
And in the case where due to idle-loaded switching-on or voltage recovery the scene of excitation surge current occurs for transformer, the reliability of differential protection is difficult to
It is protected.Since transformer core saturation needs a period of time, the appearance of poor stream will be late by changing one section in phase voltage
Time.Based on above-mentioned phenomenon, time difference method is widely used, and principle is the phase voltage variation when internal fault occurs
Occur simultaneously with the difference stream mutation moment, differential protection acts at this time；If excitation surge current occurs, phase voltage variation is mutated with difference stream
Existence time is poor, needs to be latched differential protection at this time.
Time difference method in most cases being capable of quickly and accurately differentiating transformer exciting surge and internal fault.It is however real
In the application of border, need to consider the influence of transformer both ends CT saturation.External event occurs when transformer normal operation
Barrier is when leading to its both ends CT saturation, due to failure starting stage current transformer will not saturation immediately, remain to just
True progress of disease primary current, therefore the appearance meeting lagging voltage of difference stream changes a time difference, generally higher than 3ms.
Based on above-mentioned analysis, false difference stream caused by transformer excitation flow or outer either in the case of idle-loaded switching-on
The failure difference stream that portion's failure leads to transformer both ends CT saturation and occurs all will be late by phase voltage and change a time
Difference, it is that can not determine that the time difference is caused by excitation surge current or CT saturation to rely solely on single time difference method
's.
Invention content
The present invention provides a kind of transformer excitation flow recognition methods and system based on compound time difference method, solve existing
The time difference can not be determined single time difference method is relied solely in technology the technical issues of being as caused by excitation surge current.
The technical solution that the present invention solves above-mentioned technical problem is as follows：
A kind of transformer excitation flow recognition method based on compound time difference method, suitable for electric system, the power train
System includes transformer, the first busbar positioned at the transformer side and the second busbar positioned at the transformer opposite side, knows
Other method includes：
S1, the electric system is divided into three closed loop regions, the first closed loop region includes：The transformer and its two
The current transformer at end, the second closed loop region include：The Current Mutual Inductance at the first closed loop region, first busbar and its both ends
All circuits of device and access first busbar, third closed loop region includes：First closed loop region, second busbar and
The current transformer at its both ends and all circuits of access second busbar；
S2, the first closed loop region, the second closed loop region and the third closed loop are calculated by time difference method respectively
The poor rheology moment in region, and monitor the phase voltage variation moment of the transformer；
S3, the poor rheology for judging the first closed loop region, the second closed loop region, the third closed loop region respectively
Change between moment and the phase voltage variation moment of the transformer with the presence or absence of the time difference, the transformation is identified according to judging result
Whether device occurs excitation surge current or internal fault and whether the current transformer of the transformer both sides occurs saturation.
The beneficial effects of the invention are as follows：It is real to region each after extension by the way that traditional time difference method detection zone is extended
When detection phase voltage and poor rheology moment between time difference, comprehensive distinguishing result gushed with identifying that excitation occurs for transformer
The generation of stream, internal fault or transformer both ends CT saturation.Program principle is simple, goes out only according to mutation waveform
The existing time difference is differentiated and independent of the global feature of waveform, therefore no matter transformer is in idle-loaded switching-on, no-load running
Or the state of run with load, it correctly can quickly judge the generation of internal fault.
Based on the above technical solution, the present invention can also be improved as follows.
Preferably, in step S4, when confirmation the first closed loop region, the second closed loop region, the third closed loop
When the time difference is not present between the poor rheology moment in region and the phase voltage variation moment of the transformer, the change is determined
Internal fault occurs for depressor.
Preferably, in step S4, when the poor rheology for confirming the first closed loop region and the third closed loop region
Carve equal existence time difference and the poor rheology in the second closed loop region between the phase voltage of the transformer variation moment respectively
Change between moment and the phase voltage variation moment of the transformer there is no during the time difference, determine first bus-bar fault, when
Confirm poor rheology moment in the first closed loop region and third closed loop region phase voltage with the transformer respectively
The time difference changed between the moment is when occurring simultaneously, determines Current Mutual Inductance of the transformer close to described first busbar one end
Saturation occurs for device；
When confirm poor rheology moment in the first closed loop region and the third closed loop region respectively with the transformation
Time difference between the phase voltage variation moment of device is not when occurring simultaneously, determines the transformer close to second busbar one
Saturation occurs for the current transformer at end.
Preferably, in step S4, when the poor rheology for confirming the first closed loop region and the second closed loop region
Carve equal existence time difference and the poor rheology in the third closed loop region between the phase voltage of the transformer variation moment respectively
Change between moment and the phase voltage variation moment of the transformer there is no during the time difference, determine second bus-bar fault, when
Confirm poor rheology moment in the first closed loop region and the second closed loop region phase voltage with the transformer respectively
The time difference changed between the moment is when occurring simultaneously, determines Current Mutual Inductance of the transformer close to described first busbar one end
Saturation occurs for device；
When confirm poor rheology moment in the first closed loop region and the second closed loop region respectively with the transformation
Time difference between the phase voltage variation moment of device is not when occurring simultaneously, determines the transformer close to second busbar one
Saturation occurs for the current transformer at end.
Preferably, in step S4, when confirmation the first closed loop region, the second closed loop region, the third closed loop
Between the poor rheology moment in region and the phase voltage variation moment of the transformer during equal existence time difference, the transformation is determined
Excitation surge current occurs for device.
A kind of transformer excitation flow identifying system based on compound time difference method, suitable for electric system, the power train
System includes transformer, the first busbar positioned at the transformer side and the second busbar positioned at the transformer opposite side, knows
Other system includes：
Division module is divided into three closed loop regions using by the electric system, and the first closed loop region includes：The change
Depressor and its current transformer at both ends, the second closed loop region include：First closed loop region, first busbar and its both ends
All circuits of current transformer and access first busbar, third closed loop region includes：First closed loop region, described
All circuits of the current transformer and access second busbar at two busbares and its both ends；
Computing module, for calculating the first closed loop region, the second closed loop region and institute by time difference method respectively
The poor rheology moment in third closed loop region is stated, and monitors the phase voltage variation moment of the transformer；
Identification module, for judging the first closed loop region, the second closed loop region, the third closed loop area respectively
With the presence or absence of the time difference between the poor rheology moment in domain and the phase voltage variation moment of the transformer, known according to judging result
Whether not described transformer occurs excitation surge current or internal fault and whether the current transformer of the transformer both sides occurs
Saturation.
Preferably, the identification module is specifically used for：When confirm the first closed loop region, the second closed loop region,
The time difference is not present between the poor rheology moment in the third closed loop region and the phase voltage variation moment of the transformer
When, determine that internal fault occurs for the transformer.
Preferably, the identification module is specifically used for：When confirmation the first closed loop region and the third closed loop region
The poor rheology moment change between the moment existence time difference and second closed loop the phase voltage of the transformer respectively
When the time difference is not present between the poor rheology moment in region and the phase voltage variation moment of the transformer, described first is determined
Bus-bar fault, when confirm poor rheology moment in the first closed loop region and the third closed loop region respectively with the transformation
Time difference between the phase voltage variation moment of device is when occurring simultaneously, determines the transformer close to described first busbar one end
Current transformer occur saturation；
When confirm poor rheology moment in the first closed loop region and the third closed loop region respectively with the transformation
Time difference between the phase voltage variation moment of device is not when occurring simultaneously, determines the transformer close to second busbar one
Saturation occurs for the current transformer at end.
Preferably, the identification module is specifically used for：When confirmation the first closed loop region and the second closed loop region
The poor rheology moment change between the moment existence time difference and the third closed loop the phase voltage of the transformer respectively
When the time difference is not present between the poor rheology moment in region and the phase voltage variation moment of the transformer, described second is determined
Bus-bar fault, when confirm poor rheology moment in the first closed loop region and the second closed loop region respectively with the transformation
Time difference between the phase voltage variation moment of device is when occurring simultaneously, determines the transformer close to described first busbar one end
Current transformer occur saturation；
When confirm poor rheology moment in the first closed loop region and the second closed loop region respectively with the transformation
Time difference between the phase voltage variation moment of device is not when occurring simultaneously, determines the transformer close to second busbar one
Saturation occurs for the current transformer at end.
Preferably, the identification module is specifically used for：When confirm the first closed loop region, the second closed loop region,
Between the poor rheology moment in the third closed loop region and the phase voltage variation moment of the transformer during equal existence time difference,
Determine that excitation surge current occurs for the transformer.
Description of the drawings
Fig. 1 is a kind of stream of the transformer excitation flow recognition method based on compound time difference method provided in an embodiment of the present invention
Journey schematic diagram；
Fig. 2 is that the compound time difference method that another embodiment of the present invention provides divides area schematic；
Fig. 3 is that the compound time difference method that another embodiment of the present invention provides divides area schematic；
Fig. 4 is the differentiation logic chart of compound time difference method that another embodiment of the present invention provides；
Fig. 5 is a kind of knot of the transformer excitation flow identifying system based on compound time difference method provided in an embodiment of the present invention
Structure schematic diagram.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in Figure 1, a kind of transformer excitation flow recognition method based on compound time difference method, suitable for electric system,
Electric system includes transformer, the first busbar positioned at transformer side and the second busbar positioned at transformer opposite side, identification
Method includes：
S1, electric system is divided into three closed loop regions, the first closed loop region includes：Transformer and its electric current at both ends
Mutual inductor, the second closed loop region include：The current transformer at the first closed loop region, the first busbar and its both ends and access first
All circuits of busbar, third closed loop region include：The current transformer at the first closed loop region, the second busbar and its both ends and
Access all circuits of the second busbar；
S2, the poor rheology for calculating the first closed loop region, the second closed loop region and third closed loop region by time difference method respectively
Change the moment, and monitor the phase voltage variation moment of transformer；
S3, the first closed loop region, the second closed loop region, the poor rheology moment in third closed loop region and transformation are judged respectively
With the presence or absence of the time difference between the phase voltage variation moment of device, according to judging result identify transformer whether occur excitation surge current or
Whether the current transformer of internal fault and transformer both sides occurs saturation.
According to traditional time difference method principle, the application region of time difference method is extended.Traditional time difference method is using transformer both ends TA (electricity
Current transformer) sample rate current information calculating difference stream, region 1 (the first closed loop region) is set as, in addition introduces two closed loop regions：Region
2 (the second closed loop regions) include transformer comprising transformer together with its left side busbar and both ends TA, region 3 (third closed loop region)
Together with its right side busbar and both ends TA.Time difference method is respectively adopted to each region, it is poor that both ends TA sample rate currents are made, and monitors voltage
It is mutated the moment.Moment is changed with the poor rheology moment in closed loop region with the presence or absence of the time difference according to transformer phase voltage, it is comprehensive
Each regional determination result simultaneously focuses on decision, specific as follows：
If existence time is poor between phase voltage variation moment and difference stream mutation moment that the 1, three region detections obtain,
It is caused by transformer excitation flow to show the time difference.
If the 2nd, in three regions, 1 existence time of region is poor, and region 2 then judges transformer first there is no the time difference
It breaks down close to the first busbar one end busbar：Assuming that the time difference of this time domain 3 occurs simultaneously with region 1, then judge
Close to the first busbar one end TA saturation occurs for transformer；Assuming that (inspection does not occur simultaneously with region 1 for this 3 time difference of time domain
It is poor to measure 1 time of origin of region, and it is poor to be detected simultaneously by within the time difference 3 time of origin of region, as 3 time difference of region with
Region 1 occurs simultaneously), then it is judged as that close to the second busbar one end TA saturation occurs for transformer.
If the 3rd, in three regions, 1 existence time of region is poor, and region 3 then judges transformer first there is no the time difference
It breaks down close to the second busbar one end busbar：Assuming that the time difference of this time domain 2 occurs simultaneously with region 1, then judge
Close to the first busbar one end TA saturation occurs for transformer；Assuming that this 2 time difference of time domain does not occur simultaneously with region 1, then
It is judged as that close to the second busbar one end TA saturation occurs for transformer.
The 4th, if three regions are judged as that internal fault occurs for transformer there is no the time difference.
By the way that traditional time difference method detection zone is extended, phase voltage and poor rheology are detected in real time to region each after extension
Change the time difference between the moment, comprehensive distinguishing result is to identify that excitation surge current, internal fault or transformer two occur for transformer
Hold the generation of CT saturation.Program principle is simple, only according to mutation waveform occur time difference differentiated and
Independent of the global feature of waveform, therefore no matter transformer is in the state of idle-loaded switching-on, no-load running or run with load, equal energy
The correct generation for quickly judging internal fault.
As shown in Fig. 2, compound time difference method divides area schematic.Wherein, S1-S4Represent current transformer, A and B represent female
Line, F1Represent that busbar A breaks down, F2Indication transformer breaks down, F3Represent busbar B hair failures, l1、l2、l3It is closed for three
Ring region, criteria for classifying are：l1Only include transformer ZTAnd its both ends TA (current transformer), l2Include ZTTogether with its left end institute
Connect busbar A and both ends TA, l3Include ZTBusbar B and both ends TA are connected together with its right end.Each region contact with foreign countries point is pacified
Equipped with TA, and breaker is configured, can difference current be calculated according to the sum of each point TA measured values in region.
As shown in figure 3, S0-S7Represent current transformer, A-E represents busbar, F1-F4Indication transformer, busbar B, mother respectively
Line C and busbar E break down, G1-G4Represent power supply, L1-L4Circuit is represented, based on consideration transformer both ends TA (Current Mutual Inductances
Device) saturation compound time difference criterion, first centered on transformer, be divided into l1、l2、l3Three closed loop regions.Wherein, l1Packet
Containing transformer and its both ends mutual inductor S3、S4, l2Include transformer and busbar B and both ends mutual inductor S1、S2、S4, l3Include transformation
Device and busbar C and both ends mutual inductor S3、S5-S7.And common time difference method only considers closed loop region l1。
As shown in figure 4, for the division region in Fig. 2, the differentiation logic chart of compound time difference method.Wherein, " no time difference " table
Show that transformer voltage variation moment and the time difference at poor rheology moment are less than 3ms, " having the time difference " indication transformer voltage change
The time difference at moment and poor rheology moment is more than 3ms.
Preferably, in step S3, when the poor rheology for confirming the first closed loop region, the second closed loop region, third closed loop region
When the time difference is not present between the phase voltage of the change moment and transformer variation moment, determine that internal fault occurs for transformer.
According to compound time difference method region division as a result, when internal fault F occurs for transformer2, it is assumed that transformer occurs alternate
Short trouble F2.At this point for l1、l2、l3Internal fault occurs, therefore each region voltage variation is sent out simultaneously with poor rheologyization
Raw, there is no the time differences.Due to being differentiated only according to the time difference of mutation waveform appearance independent of the entirety of waveform
Feature, therefore no matter transformer is in the state of idle-loaded switching-on, no-load running or run with load, correctly can quickly judge inside
The generation of failure.
Preferably, in step S3, when confirm poor rheology moment in the first closed loop region and third closed loop region respectively with
The poor rheology moment and transformer in equal existence time difference and the second closed loop region between the phase voltage variation moment of transformer
When the time difference is not present between the phase voltage variation moment, the first bus-bar fault is determined, when the first closed loop region of confirmation and third are closed
The time difference that the poor rheology moment of ring region changes with the phase voltage of transformer between the moment respectively is when occurring simultaneously, is determined
Saturation occurs for current transformer of the transformer close to described first busbar one end；
Become respectively with the phase voltage of transformer when the poor rheology moment for confirming the first closed loop region and third closed loop region
It is not when occurring simultaneously to change the time difference between the moment, determines that current transformer of the transformer close to described second busbar one end is sent out
Raw saturation.
According to compound time difference method region division as a result, when busbar A failures F occurs for transformer normal operation1, it is assumed that at this time mutually
Sensor S2Saturation occurs.For l1、l3, generation external area error is equivalent to, at this time due to S2Saturation, thus the voltage change moment with it is poor
Existence time is poor between the rheology moment；For l2Generation troubles inside the sample space is equivalent to, therefore voltage change and poor rheologyization are substantially
Occur simultaneously, there is no the time differences.
Further, it is assumed that mutual inductor S3Saturation occurs.For l1Generation external area error is equivalent to, at this time due to S3
Saturation, therefore existence time is poor between voltage change moment and poor rheology moment；For l2Generation troubles inside the sample space is equivalent to, thus it is electric
Bucklingization substantially simultaneously occurs with poor rheologyization, and there is no the time differences.And for l3, it is equivalent to and external fault and both ends occurs
Mutual inductor is without saturation, therefore there is no difference streams.
It further, can be according to l1Existence time is poor, l2Judge to be out of order first there is no the time difference and betide busbar A, then
By detecting l3The time difference whether with l1Occur simultaneously, to judge transformer both sides mutual inductor S2、S3Whether saturation is occurred.
Preferably, in step S3, when confirm poor rheology moment in the first closed loop region and the second closed loop region respectively with
The poor rheology moment and transformer in equal existence time difference and third closed loop region between the phase voltage variation moment of transformer
When the time difference is not present between the phase voltage variation moment, the second bus-bar fault is determined, when confirmation the first closed loop region and second is closed
The time difference that the poor rheology moment of ring region changes with the phase voltage of transformer between the moment respectively is when occurring simultaneously, is determined
Saturation occurs for current transformer of the transformer close to described first busbar one end；
Become respectively with the phase voltage of transformer when the poor rheology moment for confirming the first closed loop region and the second closed loop region
It is not when occurring simultaneously to change the time difference between the moment, determines that current transformer of the transformer close to described second busbar one end is sent out
Raw saturation.
According to compound time difference method region division as a result, when busbar B failures F occurs for transformer normal operation3, it is assumed that at this time mutually
Sensor S3Saturation occurs.For l1、l2, generation external area error is equivalent to, at this time due to S2Saturation, thus the voltage change moment with it is poor
Existence time is poor between the rheology moment；For l3Generation troubles inside the sample space is equivalent to, therefore voltage change and poor rheologyization are substantially
Occur simultaneously, there is no the time differences.
Further, it is assumed that mutual inductor S at this time2Saturation occurs.For l1Generation external area error is equivalent to, at this time due to S3
Saturation, therefore existence time is poor between voltage change moment and poor rheology moment；For l3Generation troubles inside the sample space is equivalent to, thus it is electric
Bucklingization substantially simultaneously occurs with poor rheologyization, and there is no the time differences.And for l2, it is equivalent to and external fault and inside occurs
Mutual inductor is without saturation, therefore there is no difference streams.
It further, can be according to l1Existence time is poor, l3Judge to be out of order first there is no the time difference and betide busbar B, then
By detecting l2The time difference whether with l1Occur simultaneously, to judge transformer both sides mutual inductor S2、S3Whether saturation is occurred.
Preferably, in step S3, when the poor rheology for confirming the first closed loop region, the second closed loop region, third closed loop region
When changing equal existence time difference between moment and the phase voltage variation moment of transformer, determine that excitation surge current occurs for transformer.
According to compound time difference method region division result, it is assumed that transformer is to S2Idle-loaded switching-on is held, at this time l1、l3Poor stream be
For S2End line electric current, l2Difference stream is S1End line electric current.During due to normal transformer during no-load closing, difference stream causes for core sataration
Exciting current, and the appearance of exciting current will lag behind voltage.Therefore l1、l2、l3Detect that the voltage change moment flows with difference
Change between the moment in the presence of the time difference more than 3ms.
As shown in figure 5, a kind of transformer excitation flow identifying system based on compound time difference method, suitable for electric system,
Electric system includes transformer, the first busbar positioned at transformer side and the second busbar positioned at transformer opposite side, identification
System includes：
Division module 1 is divided into three closed loop regions using by electric system, and the first closed loop region includes：Transformer and
The current transformer at its both ends, the second closed loop region include：The Current Mutual Inductance at the first closed loop region, the first busbar and its both ends
Device and all circuits for accessing the first busbar, third closed loop region includes：First closed loop region, the second busbar and its both ends
Current transformer and all circuits for accessing the second busbar；
Computing module 2, for calculating the first closed loop region, the second closed loop region and third closed loop area by time difference method respectively
The poor rheology moment in domain, and monitor the phase voltage variation moment of transformer；
Identification module 3, for judging the poor rheology in the first closed loop region, the second closed loop region, third closed loop region respectively
Change between moment and the phase voltage variation moment of transformer with the presence or absence of the time difference, identify whether transformer is sent out according to judging result
Whether raw excitation surge current or the current transformer of internal fault and transformer both sides occur saturation.
Preferably, identification module 3 is specifically used for：When the first closed loop region of confirmation, the second closed loop region, third closed loop region
The poor rheology moment and transformer the phase voltage variation moment between when the time difference is not present, it is internal to determine that transformer occurs
Failure.
Preferably, identification module 3 is specifically used for：When the poor rheology for confirming the first closed loop region and third closed loop region
Carve respectively the phase voltage of transformer change the moment between existence time difference and the second closed loop region the poor rheology moment with
When the time difference is not present between the phase voltage variation moment of transformer, the first bus-bar fault is determined, when the first closed loop region of confirmation
And the time difference that the poor rheology moment in third closed loop region changes with the phase voltage of transformer between the moment respectively is to send out simultaneously
When raw, determine that saturation occurs for current transformer of the transformer close to described first busbar one end；
Become respectively with the phase voltage of transformer when the poor rheology moment for confirming the first closed loop region and third closed loop region
It is not when occurring simultaneously to change the time difference between the moment, determines that current transformer of the transformer close to described second busbar one end is sent out
Raw saturation.
Preferably, identification module 3 is specifically used for：When the poor rheology for confirming the first closed loop region and the second closed loop region
Carve respectively the phase voltage of transformer change the moment between existence time difference and third closed loop region the poor rheology moment with
When the time difference is not present between the phase voltage variation moment of transformer, the second bus-bar fault is determined, when the first closed loop region of confirmation
And second closed loop region the poor rheology moment respectively the phase voltage of transformer change the moment between time difference be to send out simultaneously
When raw, determine that saturation occurs for current transformer of the transformer close to described first busbar one end；
Become respectively with the phase voltage of transformer when the poor rheology moment for confirming the first closed loop region and the second closed loop region
It is not when occurring simultaneously to change the time difference between the moment, determines that current transformer of the transformer close to described second busbar one end is sent out
Raw saturation.
Preferably, identification module 3 is specifically used for：When the first closed loop region of confirmation, the second closed loop region, third closed loop region
The poor rheology moment and transformer phase voltage variation the moment between existence time difference when, determine transformer occur excitation gush
Stream.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of transformer excitation flow recognition method based on compound time difference method, which is characterized in that suitable for electric system, institute
State electric system include transformer, second positioned at the first busbar of the transformer side and positioned at the transformer opposite side
Busbar, recognition methods include：
S1, the electric system is divided into three closed loop regions, the first closed loop region includes：The transformer and its both ends
Current transformer, the second closed loop region include：The current transformer at the first closed loop region, first busbar and its both ends and
All circuits of first busbar are accessed, third closed loop region includes：First closed loop region, second busbar and its both ends
Current transformer and access second busbar all circuits；
S2, the first closed loop region, the second closed loop region and the third closed loop region are calculated by time difference method respectively
The poor rheology moment, and monitor the transformer phase voltage variation the moment；
S3, when judging the poor rheology in the first closed loop region, the second closed loop region, the third closed loop region respectively
It carves between the phase voltage of the transformer variation moment with the presence or absence of the time difference, identifies that the transformer is according to judging result
Whether no generation excitation surge current or the current transformer of internal fault and the transformer both sides occur saturation.
2. a kind of transformer excitation flow recognition method based on compound time difference method according to claim 1, feature exist
In in step S3, when the poor rheology for confirming the first closed loop region, the second closed loop region, the third closed loop region
Change internal there is no during the time difference, determining that the transformer occurs between moment and the phase voltage variation moment of the transformer
Failure.
3. a kind of transformer excitation flow recognition method based on compound time difference method according to claim 1, feature exist
In, in step S3, when confirm poor rheology moment in the first closed loop region and the third closed loop region respectively with it is described
Between the phase voltage variation moment of transformer existence time difference and the poor rheology moment in the second closed loop region with it is described
When the time difference is not present between the phase voltage variation moment of transformer, first bus-bar fault is determined, when confirmation described first
The poor rheology moment in closed loop region and the third closed loop region changes with the phase voltage of the transformer between the moment respectively
Time difference be to determine that saturation occurs for current transformer of the transformer close to described first busbar one end when occurring simultaneously；
When confirm poor rheology moment in the first closed loop region and the third closed loop region respectively with the transformer
Time difference between the phase voltage variation moment is not when occurring simultaneously, determines the transformer close to described second busbar one end
Saturation occurs for current transformer.
4. a kind of transformer excitation flow recognition method based on compound time difference method according to claim 1, feature exist
In, in step S3, when confirm poor rheology moment in the first closed loop region and the second closed loop region respectively with it is described
Between the phase voltage variation moment of transformer existence time difference and the poor rheology moment in the third closed loop region with it is described
When the time difference is not present between the phase voltage variation moment of transformer, second bus-bar fault is determined, when confirmation described first
The poor rheology moment in closed loop region and the second closed loop region changes with the phase voltage of the transformer between the moment respectively
Time difference be to determine that saturation occurs for current transformer of the transformer close to described first busbar one end when occurring simultaneously；
When confirm poor rheology moment in the first closed loop region and the second closed loop region respectively with the transformer
Time difference between the phase voltage variation moment is not when occurring simultaneously, determines the transformer close to described second busbar one end
Saturation occurs for current transformer.
5. a kind of transformer excitation flow recognition method based on compound time difference method according to claim 1, feature exist
In in step S3, when the poor rheology for confirming the first closed loop region, the second closed loop region, the third closed loop region
When changing equal existence time difference between moment and the phase voltage variation moment of the transformer, determine that the transformer occurs excitation and gushes
Stream.
6. a kind of transformer excitation flow identifying system based on compound time difference method, which is characterized in that suitable for electric system, institute
State electric system include transformer, second positioned at the first busbar of the transformer side and positioned at the transformer opposite side
Busbar, identifying system include：
Division module, for the electric system to be divided into three closed loop regions, the first closed loop region includes：The transformer
And its current transformer at both ends, the second closed loop region include：The electric current at the first closed loop region, first busbar and its both ends
All circuits of mutual inductor and access first busbar, third closed loop region includes：First closed loop region, described second is female
All circuits of the current transformer and access second busbar at line and its both ends；
Computing module, for calculating the first closed loop region, the second closed loop region and described by time difference method respectively
The poor rheology moment in three closed loop regions, and monitor the phase voltage variation moment of the transformer；
Identification module, for judging the first closed loop region, the second closed loop region, the third closed loop region respectively
With the presence or absence of the time difference between the phase voltage of poor rheology moment and the transformer variation moment, institute is identified according to judging result
State whether transformer occurs excitation surge current or internal fault and whether the current transformer of the transformer both sides satisfies
With.
7. a kind of transformer excitation flow identifying system based on compound time difference method according to claim 6, feature exist
In the identification module is specifically used for：When confirmation the first closed loop region, the second closed loop region, the third closed loop
When the time difference is not present between the poor rheology moment in region and the phase voltage variation moment of the transformer, the change is determined
Internal fault occurs for depressor.
8. a kind of transformer excitation flow identifying system based on compound time difference method according to claim 6, feature exist
In the identification module is specifically used for：When the poor rheology for confirming the first closed loop region and the third closed loop region
Carve equal existence time difference and the poor rheology in the second closed loop region between the phase voltage of the transformer variation moment respectively
Change between moment and the phase voltage variation moment of the transformer there is no during the time difference, determine first bus-bar fault, when
Confirm poor rheology moment in the first closed loop region and third closed loop region phase voltage with the transformer respectively
The time difference changed between the moment is when occurring simultaneously, determines Current Mutual Inductance of the transformer close to described first busbar one end
Saturation occurs for device；
When confirm poor rheology moment in the first closed loop region and the third closed loop region respectively with the transformer
Time difference between the phase voltage variation moment is not when occurring simultaneously, determines the transformer close to described second busbar one end
Saturation occurs for current transformer.
9. a kind of transformer excitation flow identifying system based on compound time difference method according to claim 6, feature exist
In the identification module is specifically used for：When the poor rheology for confirming the first closed loop region and the second closed loop region
Carve equal existence time difference and the poor rheology in the third closed loop region between the phase voltage of the transformer variation moment respectively
Change between moment and the phase voltage variation moment of the transformer there is no during the time difference, determine second bus-bar fault, when
Confirm poor rheology moment in the first closed loop region and the second closed loop region phase voltage with the transformer respectively
The time difference changed between the moment is when occurring simultaneously, determines Current Mutual Inductance of the transformer close to described first busbar one end
Saturation occurs for device；
When confirm poor rheology moment in the first closed loop region and the second closed loop region respectively with the transformer
Time difference between the phase voltage variation moment is not when occurring simultaneously, determines the transformer close to described second busbar one end
Saturation occurs for current transformer.
10. a kind of transformer excitation flow identifying system based on compound time difference method according to claim 6, feature exist
In the identification module is specifically used for：When confirmation the first closed loop region, the second closed loop region, the third closed loop
Between the poor rheology moment in region and the phase voltage variation moment of the transformer during equal existence time difference, the transformation is determined
Excitation surge current occurs for device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711378082.3A CN108173240B (en) | 2017-12-19 | 2017-12-19 | A kind of transformer excitation flow recognition method and system based on compound time difference method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711378082.3A CN108173240B (en) | 2017-12-19 | 2017-12-19 | A kind of transformer excitation flow recognition method and system based on compound time difference method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108173240A true CN108173240A (en) | 2018-06-15 |
| CN108173240B CN108173240B (en) | 2019-06-28 |
Family
ID=62522600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711378082.3A Expired - Fee Related CN108173240B (en) | 2017-12-19 | 2017-12-19 | A kind of transformer excitation flow recognition method and system based on compound time difference method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108173240B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061474A (en) * | 2019-04-16 | 2019-07-26 | 华南理工大学 | A method of it identifies and prevents that transformer differential protection is caused to act with echo surge current |
| CN113267698A (en) * | 2021-06-02 | 2021-08-17 | 南京国电南自电网自动化有限公司 | Method, system and storage medium for distinguishing main transformer CT saturation |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1474489A (en) * | 2003-08-08 | 2004-02-11 | 国电南京自动化股份有限公司 | Judging method for heavy saturation of current transformer by time-difference method for relay protection |
| CN1787313A (en) * | 2005-11-16 | 2006-06-14 | 田伟 | Method for saturating anti-current matual inductor differential protecting |
| US20090147412A1 (en) * | 2007-12-07 | 2009-06-11 | Cooper Technologies Company | Transformer inrush current detector |
| US20100085668A1 (en) * | 2007-04-20 | 2010-04-08 | Mitsubishi Electric Corporation | Phase-control switching apparatus and switching control method for phase-control switching apparatus |
| CN102522726A (en) * | 2011-12-30 | 2012-06-27 | 长园深瑞继保自动化有限公司 | Method for locking magnetizing inrush current of transformer |
| CN103401226A (en) * | 2013-08-09 | 2013-11-20 | 国网山东省电力公司潍坊供电公司 | Substation area differential protection method for intelligent substation |
| CN104319737A (en) * | 2014-10-30 | 2015-01-28 | 国网宁夏电力公司电力科学研究院 | Differential protection configuration method and device for sending transformer out of double-feed type wind field |
| CN104810795A (en) * | 2015-04-30 | 2015-07-29 | 国家电网公司 | Improved inrush current identification method |
| CN105552837A (en) * | 2016-01-20 | 2016-05-04 | 华北电力大学 | Differential protection method for partition inverse-time transformer by considering DC bias effects |
-
2017
- 2017-12-19 CN CN201711378082.3A patent/CN108173240B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1474489A (en) * | 2003-08-08 | 2004-02-11 | 国电南京自动化股份有限公司 | Judging method for heavy saturation of current transformer by time-difference method for relay protection |
| CN1787313A (en) * | 2005-11-16 | 2006-06-14 | 田伟 | Method for saturating anti-current matual inductor differential protecting |
| US20100085668A1 (en) * | 2007-04-20 | 2010-04-08 | Mitsubishi Electric Corporation | Phase-control switching apparatus and switching control method for phase-control switching apparatus |
| US20090147412A1 (en) * | 2007-12-07 | 2009-06-11 | Cooper Technologies Company | Transformer inrush current detector |
| CN102522726A (en) * | 2011-12-30 | 2012-06-27 | 长园深瑞继保自动化有限公司 | Method for locking magnetizing inrush current of transformer |
| CN103401226A (en) * | 2013-08-09 | 2013-11-20 | 国网山东省电力公司潍坊供电公司 | Substation area differential protection method for intelligent substation |
| CN104319737A (en) * | 2014-10-30 | 2015-01-28 | 国网宁夏电力公司电力科学研究院 | Differential protection configuration method and device for sending transformer out of double-feed type wind field |
| CN104810795A (en) * | 2015-04-30 | 2015-07-29 | 国家电网公司 | Improved inrush current identification method |
| CN105552837A (en) * | 2016-01-20 | 2016-05-04 | 华北电力大学 | Differential protection method for partition inverse-time transformer by considering DC bias effects |
Non-Patent Citations (1)
| Title |
|---|
| 曾湘等: "基于相电压和差流时差特征的变压器保护新判据", 《电力系统自动化》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061474A (en) * | 2019-04-16 | 2019-07-26 | 华南理工大学 | A method of it identifies and prevents that transformer differential protection is caused to act with echo surge current |
| CN110061474B (en) * | 2019-04-16 | 2021-05-14 | 华南理工大学 | Method for identifying and preventing transformer differential protection action caused by sympathetic inrush current |
| CN113267698A (en) * | 2021-06-02 | 2021-08-17 | 南京国电南自电网自动化有限公司 | Method, system and storage medium for distinguishing main transformer CT saturation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108173240B (en) | 2019-06-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101881802B (en) | Dry type hollow reactor interturn short circuit fault on-line real-time detection method | |
| US20110188159A1 (en) | Method and device for supervising secondary circuit of instrument transformer in power system | |
| CN108173240B (en) | A kind of transformer excitation flow recognition method and system based on compound time difference method | |
| CN107271836B (en) | The PT wire break detection method that fuse of generator generator terminal melts slowly | |
| CN104319736B (en) | Differential protection method for extra-high voltage transformer | |
| CN105429111B (en) | Prevent 3/2 wiring list CT saturations from causing the method for optical fiber differential protective malfunction | |
| CN107332199B (en) | A kind of relay protection movement intelligent evaluation method based on Multi-level information fusion | |
| CN107069673A (en) | A kind of method of quick identification branch road CT broken strings and locking bus differential protection | |
| CN105353261B (en) | Open phase fault detection method, device and a kind of automatic change-over | |
| CN110912161B (en) | Method for discriminating incoming line phase failure of traction substation power supply | |
| CN105044555B (en) | A kind of high voltage direct current transmission line fault pole method of discrimination using monopole electrical quantity | |
| CN104111396A (en) | Stable-control main transformer tripping discriminating method of large wind power integration substation | |
| CN106300284B (en) | Single point of double mothers prevent the method, apparatus of external area error false tripping exception mother/segmentation | |
| JP2017163651A (en) | High voltage ground relay for dc railway substation | |
| CN107481541A (en) | A kind of signal lamp driver overlaps fault detection method | |
| CN106371049A (en) | Current transformer secondary open circuit identification method | |
| CN105004947B (en) | One kind exchange looped network state monitoring method and system | |
| CN207039164U (en) | A kind of controling circuit structure with fault detection capability | |
| CN110763992A (en) | AC/DC comprehensive test method for on-load tap-changer of large transformer | |
| TW201743553A (en) | Power conversion device and method for determining operational state of cutoff unit | |
| CN106655115A (en) | Differential protection discrimination method based on integrated sequence component | |
| CN106229950B (en) | A kind of intelligent substation integration protection method | |
| CN105244860B (en) | A kind of differential protecting method based on positive sequence admittance | |
| CN104362590B (en) | Main transformer divides the recognition methods of side differential protection public winding CT progress of disease exceptions | |
| CN105552855B (en) | Prevent 3/2 mode of connection list CT saturations from causing the method for distance protection malfunction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190628 Termination date: 20191219 |