CN108173240B - 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
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- CN108173240B CN108173240B CN201711378082.3A CN201711378082A CN108173240B CN 108173240 B CN108173240 B CN 108173240B CN 201711378082 A CN201711378082 A CN 201711378082A CN 108173240 B CN108173240 B CN 108173240B
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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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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of transformer excitation flow recognition method and system based on compound time difference method, method include: S1, symmetrical region are 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；S3, judge to identify that excitation surge current, internal fault or transformer both ends CT saturation occur for transformer according to judging result with the presence or absence of the time difference between the phase voltage variation moment of the first closed loop region, the second closed loop region, the poor rheology moment in third closed loop region and transformer respectively.The beneficial effects of the present invention are: 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, in particular to a kind of transformer excitation flow based on compound time difference method
Recognition methods and system.
Background technique
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
There are the time difference, need 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.However it is real
In the application of border, need to consider the influence of transformer both ends CT saturation.External event occurs when transformer operates normally
When barrier leads to its both ends CT saturation, due to that will not be saturated immediately in failure initial stage current transformer, 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, the difference of falseness caused by transformer excitation flow stream either in the case of idle-loaded switching-on, or it is outer
Portion's failure leads to transformer both ends CT saturation and the failure difference stream that occurs, all will be late by phase voltage and changes a time
Difference, relying solely on single time difference method is that can not determine that the time difference is caused by excitation surge current or CT saturation
's.
Summary of the invention
The present invention provides a kind of recognition methods of transformer working condition and system based on compound time difference method solve existing
Single time difference method is relied solely in technology can not determine that the time difference is the technical issues of being caused by excitation surge current.
The technical scheme to solve the above technical problems is that
A kind of transformer working condition recognition methods based on compound time difference method is suitable for electric system, the power train
System includes transformer, and the second bus positioned at the first bus of the transformer side and positioned at the transformer other side is known
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 in the first closed loop region, first bus and its both ends
Device, and all routes of access first bus, third closed loop region include: the first closed loop region, second bus and
The current transformer at its both ends, and all routes of access second bus；
S2, first closed loop region, second closed loop region and the third closed loop 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 first closed loop region, second closed loop region, third closed loop region respectively
Changing whether there is the time difference between moment and the phase voltage variation moment of the transformer, identify the transformation according to judging result
Whether device occurs excitation surge current or internal fault and whether the current transformer of the transformer two sides is saturated.
The beneficial effects of the present invention are: by the way that traditional time difference method detection zone to be extended, it is real to region each after extension
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 the global feature independent of waveform, therefore no matter transformer is in idle-loaded switching-on, idle 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 first closed loop region, 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 confirming the poor rheology in first closed loop region and third closed loop region
Carve the poor rheology that there is time difference and 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 when the time difference, determines first bus-bar fault, when
Confirm poor rheology moment in first closed loop region and third closed loop region phase voltage with the transformer respectively
The time difference changed between the moment is to determine the transformer close to the Current Mutual Inductance of first bus one end when occurring simultaneously
Device is saturated；
When confirmation first closed loop region and third closed loop region the poor rheology moment respectively with the transformation
Time difference between the phase voltage variation moment of device is not to determine the transformer close to second bus one when occurring simultaneously
The current transformer at end is saturated.
Preferably, in step S4, when confirming the poor rheology in first closed loop region and second closed loop region
Carve the poor rheology that there is time difference and 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 when the time difference, determines second bus-bar fault, when
Confirm poor rheology moment in first closed loop region and second closed loop region phase voltage with the transformer respectively
The time difference changed between the moment is to determine the transformer close to the Current Mutual Inductance of first bus one end when occurring simultaneously
Device is saturated；
When confirmation first closed loop region and second closed loop region the poor rheology moment respectively with the transformation
Time difference between the phase voltage variation moment of device is not to determine the transformer close to second bus one when occurring simultaneously
The current transformer at end is saturated.
Preferably, in step S4, when confirmation first closed loop region, second closed loop region, the third closed loop
When there is the time difference between the poor rheology moment in region and the phase voltage variation moment of the transformer, the transformation is determined
Excitation surge current occurs for device.
A kind of transformer working condition identifying system based on compound time difference method is suitable for electric system, the power train
System includes transformer, and the second bus positioned at the first bus of the transformer side and positioned at the transformer other side is known
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: the first closed loop region, first bus and its both ends
Current transformer, and all routes of access first bus, third closed loop region includes: the first closed loop region, and described the
Two buses and its current transformer at both ends, and all routes of access second bus；
Computing module, for calculating first closed loop region, 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 first closed loop region, second closed loop region, third closed loop area respectively
It whether there is 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 the not described transformer occurs excitation surge current or internal fault and whether the current transformer of the transformer two sides occurs
Saturation.
Preferably, the identification module is specifically used for: when confirmation first closed loop region, second closed loop region,
The time difference is not present between the poor rheology moment in 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 first closed loop region and third closed loop region
The poor rheology moment respectively the phase voltage of the transformer variation moment between there is time difference and second 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, described first is determined
Bus-bar fault, when confirmation first closed loop region and third closed loop region the poor rheology moment respectively with the transformation
Time difference between the phase voltage variation moment of device is to determine the transformer close to first bus one end when occurring simultaneously
Current transformer be saturated；
When confirmation first closed loop region and third closed loop region the poor rheology moment respectively with the transformation
Time difference between the phase voltage variation moment of device is not to determine the transformer close to second bus one when occurring simultaneously
The current transformer at end is saturated.
Preferably, the identification module is specifically used for: when confirmation first closed loop region and second closed loop region
The poor rheology moment respectively the phase voltage of the transformer variation moment between there is time difference and 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, described second is determined
Bus-bar fault, when confirmation first closed loop region and second closed loop region the poor rheology moment respectively with the transformation
Time difference between the phase voltage variation moment of device is to determine the transformer close to first bus one end when occurring simultaneously
Current transformer be saturated；
When confirmation first closed loop region and second closed loop region the poor rheology moment respectively with the transformation
Time difference between the phase voltage variation moment of device is not to determine the transformer close to second bus one when occurring simultaneously
The current transformer at end is saturated.
Preferably, the identification module is specifically used for: when confirmation first closed loop region, second closed loop region,
When there is the time difference between the poor rheology moment in third closed loop region and the phase voltage variation moment of the transformer,
Determine that excitation surge current occurs for the transformer.
Detailed description of the invention
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 be another embodiment of the present invention provides compound time difference method divide area schematic；
Fig. 3 be another embodiment of the present invention provides compound time difference method divide area schematic；
Fig. 4 be another embodiment of the present invention provides compound time difference method differentiation logic chart；
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 invention.
As shown in Figure 1, a kind of transformer excitation flow recognition method based on compound time difference method, is suitable for electric system,
Electric system includes transformer, the first bus positioned at transformer side and the second bus positioned at the transformer other side, identification
Method includes:
S1, electric system is divided into three closed loop regions, the first closed loop region includes: the electric current at transformer and its both ends
Mutual inductor, the second closed loop region include: the current transformer in the first closed loop region, the first bus and its both ends, and access first
All routes of bus, third closed loop region include: the current transformer in the first closed loop region, the second bus and its both ends, and
Access all routes of the second bus；
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 monitors 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
Device phase voltage variation the moment between whether there is the time difference, according to judging result identify transformer whether occur excitation surge current or
Whether the current transformer of internal fault and transformer two sides is saturated.
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, it is set as region 1 (the first closed loop region), in addition introduces two closed loop regions: region
2 (the second closed loop regions) include transformer together with its left side bus and both ends TA, and region 3 (third closed loop region) includes transformer
Together with its right side bus and both ends TA.Time difference method is respectively adopted to each region, it is poor to make to both ends TA sample rate current, and monitors voltage
It is mutated the moment.It whether there is the time difference according to the poor rheology moment that transformer phase voltage changes moment and closed loop region, it is comprehensive
Each regional determination result simultaneously focuses on decision, specific as follows:
If there is the time difference between the phase voltage variation moment that 1, three region detections obtain and difference stream mutation moment,
Show that the time difference is due to caused by transformer excitation flow.
If 2, in three regions, there are the time differences in region 1, and the time difference is not present in region 2, then determines transformer first
It breaks down close to first bus one end bus: assuming that the time difference of this time domain 3 occurs simultaneously with region 1, then determining
Transformer is saturated close to first bus one end TA；Assuming that (inspection does not occur with region 1 simultaneously 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 transformer is saturated close to second bus one end TA.
If 3, in three regions, there are the time differences in region 1, and the time difference is not present in region 3, then determines transformer first
It breaks down close to second bus one end bus: assuming that the time difference of this time domain 2 occurs simultaneously with region 1, then determining
Transformer is saturated close to first bus one end TA；Assuming that this 2 time difference of time domain does not occur with region 1 simultaneously, then
It is judged as that transformer is saturated close to second bus one end TA.
If 4, the time difference is not present in three regions, it is judged as that internal fault occurs for transformer.
By the way that traditional time difference method detection zone to be extended, to region real-time detection phase voltage each after extension and poor rheology
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, idle running or run with load, equal energy
Correctly quickly judge the generation of internal fault.
As shown in Fig. 2, compound time difference method divides area schematic.Wherein, S1-S4Indicate that current transformer, A and B indicate female
Line, F1Indicate that bus A breaks down, F2Indication transformer breaks down, F3Indicate that bus B sends out failure, l1、l2、l3It is closed for three
Ring region, criteria for classifying are as follows: l1It only include transformer ZTAnd its both ends TA (current transformer), l2Include ZTTogether with its left end institute
Connect bus A and both ends TA, l3Include ZTTogether with its right end connected bus B and both ends TA.Each region contact with foreign countries point is pacified
Equipped with TA, and breaker is configured, difference current can be calculated according to the sum of each point TA measured value in region.
As shown in figure 3, S0-S7Indicate that current transformer, A-E indicate bus, F1-F4Respectively indicate transformer, bus B, mother
Line C and bus E break down, G1-G4Indicate power supply, L1-L4Route is indicated, based on consideration transformer both ends TA (Current Mutual Inductance
Device) saturation compound time difference criterion be divided into l first centered on transformer1、l2、l3Three closed loop regions.Wherein, l1Packet
Containing transformer and its both ends mutual inductor S3、S4, l2Include transformer and bus B and both ends mutual inductor S1、S2、S4, l3Include transformation
Device and bus 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 greater 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 the variation of each region voltage is sent out simultaneously with poor rheologyization
It is raw, the time difference is not present.Since the time difference occurred only according to mutation waveform is differentiated and entirety independent of waveform
Feature, therefore no matter transformer is in the state of idle-loaded switching-on, idle 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 phase voltage of transformer changes the poor rheology moment and transformer that there is time difference and the second closed loop region between the moment
Phase voltage changes between the moment there is no when the time difference, determines the first bus-bar fault, when the first closed loop region of confirmation and third are closed
Time difference of the poor rheology moment of ring region respectively between the phase voltage of the transformer variation moment is determined when occurring simultaneously
Current transformer of the transformer close to first bus one end is saturated；
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
Changing the time difference between the moment is not to determine that current transformer of the transformer close to second bus one end is sent out when occurring simultaneously
Raw saturation.
According to compound time difference method region division as a result, bus A failure F occurs when transformer operates normally1, it is assumed that at this time mutually
Sensor S2It is saturated.For l1、l3, it is equivalent to generation external area error, at this time due to S2Saturation, therefore voltage change moment and poor
There are the time differences between the rheology moment；For l2It is equivalent to generation troubles inside the sample space, therefore voltage change and poor rheologyization are substantially
Occur simultaneously, the time difference is not present.
Further, it is assumed that mutual inductor S3It is saturated.For l1It is equivalent to generation external area error, at this time due to S3
Saturation, therefore there are the time differences between voltage change moment and poor rheology moment；For l2It is equivalent to generation troubles inside the sample space, thus it is electric
Bucklingization substantially simultaneously occurs with poor rheologyization, and the time difference is not present.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 l1There are time differences, l2Determine to be out of order first there is no the time difference and betides bus A, then
By detecting l3The time difference whether with l1Occur simultaneously, to judge transformer two sides mutual inductor S2、S3Whether it is saturated.
Preferably, in step S3, when confirm poor rheology moment in the first closed loop region and the second closed loop region respectively with
The phase voltage of transformer changes the poor rheology moment and transformer that there is time difference and third closed loop region between the moment
Phase voltage changes between the moment there is no when the time difference, determines the second bus-bar fault, when confirmation the first closed loop region and second is closed
Time difference of the poor rheology moment of ring region respectively between the phase voltage of the transformer variation moment is determined when occurring simultaneously
Current transformer of the transformer close to first bus one end is saturated；
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
Changing the time difference between the moment is not to determine that current transformer of the transformer close to second bus one end is sent out when occurring simultaneously
Raw saturation.
According to compound time difference method region division as a result, bus B failure F occurs when transformer operates normally3, it is assumed that at this time mutually
Sensor S3It is saturated.For l1、l2, it is equivalent to generation external area error, at this time due to S2Saturation, therefore voltage change moment and poor
There are the time differences between the rheology moment；For l3It is equivalent to generation troubles inside the sample space, therefore voltage change and poor rheologyization are substantially
Occur simultaneously, the time difference is not present.
Further, it is assumed that mutual inductor S at this time2It is saturated.For l1It is equivalent to generation external area error, at this time due to S3
Saturation, therefore there are the time differences between voltage change moment and poor rheology moment；For l3It is equivalent to generation troubles inside the sample space, thus it is electric
Bucklingization substantially simultaneously occurs with poor rheologyization, and the time difference is not present.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 l1There are time differences, l3Determine to be out of order first there is no the time difference and betides bus B, then
By detecting l2The time difference whether with l1Occur simultaneously, to judge transformer two sides mutual inductor S2、S3Whether it is saturated.
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 phase voltage of change moment and transformer has the time difference between the variation moment, 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.When 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 voltage change moment and difference flow
Change between the moment time difference existed greater than 3ms.
As shown in figure 5, a kind of transformer excitation flow identifying system based on compound time difference method, is suitable for electric system,
Electric system includes transformer, the first bus positioned at transformer side and the second bus positioned at the transformer other side, identification
System includes:
Division module 1 is divided into three closed loop regions using by electric system, the first closed loop region include: transformer and
The current transformer at its both ends, the second closed loop region include: the Current Mutual Inductance in the first closed loop region, the first bus and its both ends
Device, and all routes of the first bus of access, third closed loop region includes: the first closed loop region, the second bus and its both ends
Current transformer, and all routes of the second bus of access；
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
Changing whether there is the time difference between moment and the phase voltage variation moment of transformer, identify whether transformer is sent out according to judging result
Whether the current transformer of raw excitation surge current or internal fault and transformer two sides is saturated.
Preferably, identification module 3 is specifically used for: when confirmation the first closed loop region, 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 confirming the poor rheology in the first closed loop region and third closed loop region
Carve exist between the phase voltage of the transformer variation moment respectively poor rheology moment in time difference and the second closed loop region 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 time difference of the poor rheology moment in third closed loop region respectively between the phase voltage of the transformer variation moment is to send out simultaneously
When raw, determine that current transformer of the transformer close to first bus one end is saturated；
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
Changing the time difference between the moment is not to determine that current transformer of the transformer close to second bus one end is sent out when occurring simultaneously
Raw saturation.
Preferably, identification module 3 is specifically used for: when confirming the poor rheology in the first closed loop region and the second closed loop region
Carve exist between the phase voltage of the transformer variation moment respectively poor rheology moment in time difference and third closed loop region 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 variation the moment between time difference be to send out simultaneously
When raw, determine that current transformer of the transformer close to first bus one end is saturated；
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
Changing the time difference between the moment is not to determine that current transformer of the transformer close to second bus one end is sent out when occurring simultaneously
Raw saturation.
Preferably, identification module 3 is specifically used for: when confirmation the first closed loop region, the second closed loop region, third closed loop region
The poor rheology moment and transformer the phase voltage variation moment between when there is the time difference, determine that transformer occurs excitation and gushes
Stream.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of transformer working condition recognition methods based on compound time difference method, which is characterized in that be suitable for electric system, institute
Stating electric system includes transformer, positioned at the first bus of the transformer side and positioned at the second of the transformer other side
Bus, 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 in the first closed loop region, first bus and its both ends, and
All routes of first bus are accessed, third closed loop region includes: the first closed loop region, second bus and its both ends
Current transformer, and all routes of access second bus；
S2, first closed loop region, second closed loop region and third closed loop region 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 first closed loop region, second closed loop region, third closed loop region respectively
It carves and whether there is the time difference between the phase voltage of the transformer variation moment, identify that the transformer is according to judging result
Whether the current transformer of no generation excitation surge current or internal fault and the transformer two sides is saturated.
2. a kind of transformer working condition recognition methods based on compound time difference method according to claim 1, feature exist
In in step S3, when the poor rheology in confirmation first closed loop region, second closed loop region, third closed loop region
Change internal there is no when 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 working condition recognition methods based on compound time difference method according to claim 1, feature exist
In, in step S3, when confirmation first closed loop region and third closed loop region the poor rheology moment respectively with it is described
Transformer phase voltage variation the moment between there is the time difference and the poor rheology moment in 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 third closed loop region is respectively between the phase voltage of the transformer variation moment
Time difference be to determine that current transformer of the transformer close to first bus one end is saturated when occurring simultaneously；
When confirmation first closed loop region and third closed loop region the poor rheology moment respectively with the transformer
The time difference that phase voltage changed between the moment is not to determine the transformer close to second bus one end when occurring simultaneously
Current transformer is saturated.
4. a kind of transformer working condition recognition methods based on compound time difference method according to claim 1, feature exist
In, in step S3, when confirmation first closed loop region and second closed loop region the poor rheology moment respectively with it is described
Transformer phase voltage variation the moment between there is the time difference and the poor rheology moment in 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 second closed loop region is respectively between the phase voltage of the transformer variation moment
Time difference be to determine that current transformer of the transformer close to first bus one end is saturated when occurring simultaneously；
When confirmation first closed loop region and second closed loop region the poor rheology moment respectively with the transformer
The time difference that phase voltage changed between the moment is not to determine the transformer close to second bus one end when occurring simultaneously
Current transformer is saturated.
5. a kind of transformer working condition recognition methods based on compound time difference method according to claim 1, feature exist
In in step S3, when the poor rheology in confirmation first closed loop region, second closed loop region, third closed loop region
When the phase voltage of change moment and the transformer has the time difference between the variation moment, determine that the transformer occurs excitation and gushes
Stream.
6. a kind of transformer working condition identifying system based on compound time difference method, which is characterized in that be suitable for electric system, institute
Stating electric system includes transformer, positioned at the first bus of the transformer side and positioned at the second of the transformer other side
Bus, 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 in the first closed loop region, first bus and its both ends
Mutual inductor, and all routes of access first bus, third closed loop region includes: the first closed loop region, and described second is female
Line and its current transformer at both ends, and all routes of access second bus；
Computing module, for calculating first closed loop region, 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 first closed loop region, second closed loop region, third closed loop region respectively
The phase voltage of poor rheology moment and the transformer, which changes, whether there is the time difference between the moment, identify institute according to judging result
State whether transformer occurs excitation surge current or internal fault and whether the current transformer of the transformer two sides satisfies
With.
7. a kind of transformer working condition identifying system based on compound time difference method according to claim 6, feature exist
In the identification module is specifically used for: when confirmation first closed loop region, 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 working condition identifying system based on compound time difference method according to claim 6, feature exist
In the identification module is specifically used for: when confirming the poor rheology in first closed loop region and third closed loop region
Carve the poor rheology that there is time difference and 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 when the time difference, determines first bus-bar fault, when
Confirm poor rheology moment in first closed loop region and third closed loop region phase voltage with the transformer respectively
The time difference changed between the moment is to determine the transformer close to the Current Mutual Inductance of first bus one end when occurring simultaneously
Device is saturated；
When confirmation first closed loop region and third closed loop region the poor rheology moment respectively with the transformer
The time difference that phase voltage changed between the moment is not to determine the transformer close to second bus one end when occurring simultaneously
Current transformer is saturated.
9. a kind of transformer working condition identifying system based on compound time difference method according to claim 6, feature exist
In the identification module is specifically used for: when confirming the poor rheology in first closed loop region and second closed loop region
Carve the poor rheology that there is time difference and 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 when the time difference, determines second bus-bar fault, when
Confirm poor rheology moment in first closed loop region and second closed loop region phase voltage with the transformer respectively
The time difference changed between the moment is to determine the transformer close to the Current Mutual Inductance of first bus one end when occurring simultaneously
Device is saturated；
When confirmation first closed loop region and second closed loop region the poor rheology moment respectively with the transformer
The time difference that phase voltage changed between the moment is not to determine the transformer close to second bus one end when occurring simultaneously
Current transformer is saturated.
10. a kind of transformer working condition identifying system based on compound time difference method according to claim 6, feature exist
In the identification module is specifically used for: when confirmation first closed loop region, second closed loop region, the third closed loop
When there is the time difference between the poor rheology moment in region and the phase voltage variation moment of the transformer, the transformation is determined
Excitation surge current occurs for device.
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| 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 |
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