CN106786426A - The comprehensive distinguishing method of one Ge Ban main electrical schemes transformer station dead-zone fault - Google Patents
The comprehensive distinguishing method of one Ge Ban main electrical schemes transformer station dead-zone fault Download PDFInfo
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- CN106786426A CN106786426A CN201710034291.XA CN201710034291A CN106786426A CN 106786426 A CN106786426 A CN 106786426A CN 201710034291 A CN201710034291 A CN 201710034291A CN 106786426 A CN106786426 A CN 106786426A
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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Abstract
The invention discloses the comprehensive distinguishing method of a Ge Ban main electrical schemes transformer station dead-zone fault, described method includes step：Three-phase voltage on the three-phase current of Real-time Collection whole transformer station each breaker, each string；Trip signal to each bus protection in whole transformer station, route protection, tranformer protection is sampled；Calculate three-phase current, each three-phase voltage and residual voltage, the phase to phase impedance of breaker for going here and there of breaker; sampled trip protection signal behavior fault zone is utilized, resultant fault positioning is carried out using circuit breaker current size after trip protection and the size of wave character, voltage and impedance；The present invention have selected the breaker unit that transformer station occurs dead-zone fault using the comprehensive distinguishing method of transformer station's whole station information; it is safe; quick action; the result may apply in the breaker dead zone protection differentiation of station domain; the fault clearing time of breaker dead zone protection is substantially shorter, the security of bulk power grid power system is improved.
Description
Technical field
The invention belongs to field of relay protection in power, and in particular to protected (bus protection, circuit based on scene
Protection, tranformer protection) trip signal divide fault zone, using the current characteristic of the breaker being associated with fault zone,
Voltage characteristic and impedance characteristic carry out the breaker dead-zone fault method of discrimination of comprehensive distinguishing.
Background technology
The contrary distribution feature of China's primary energy and electric load so that development is remote, the super extra-high voltage of Large Copacity
AC-HVDC technology turns into the fundamental realities of the country, the interconnected power grid that China's just walking conclusion of the business, direct current intercouple.With power supply
Structure is to new energy combination transition such as conventional energy resource and wind-powered electricity generation, photovoltaics.Alternating current-direct current distribution, microgrid are accessed and increased, and power network is multiple
Miscellaneous degree constantly strengthens.In AC and DC serial-parallel power grid, during receiving end ac short circuit failure, system voltage declines, and may trigger direct current
Commutation failure, while huge active, reactive power impact is caused to receiving end, can be delivered to sending end, serious conditions by energy impact
Under possibly even cause sending stability disruption.Quick protection belongs to the first line of defence of electricity net safety stable, current special
In high voltage ac/dc serial-parallel power grid, due to the presence of direct-current commutation failure phenomenon, quick protection reliably cuts off failure, and meaning is outstanding
Its is great.Such as：The ac short circuit failure of East China Power Grid, such as can not quickly be cut off, and 7 times direct currents may be triggered to occur simultaneously continuously
Commutation failure, the transient state energy impact of generation is maximum up to 32,000,000 kilowatts, disconnected to sending end North China, Central China, southwestern power network exchange
Enormous impact is caused in face, causes transient state generator rotor angle unstability between electric power generator group, there is stabilization of power grids destruction risk.
Grid collapses, and, it is necessary to by breaker fail protection action and extremely when breaker tripping or dead-zone fault
Area's protection excision failure.At present, according to《220kV~750kV grid relay protective apparatus run code of adjusting》(DL/T 559—
2007) Industry code requirements, the breaker fail protection actuation time of power system, general adjusting was 250ms, correspondingly failure
Need to consider according to 0.45s with the dead-zone fault mute time.Stability Calculation check result shows, such as shortening breaker failure and extremely
The mute time of area's failure, the stability of a system will be effectively improved.Therefore, the fault location of research transformer station dead-zone fault, passes through
Comprehensive coordination corrective measure, compresses the fault clearing time of breaker dead-zone fault, has important meaning to improving the stability of a system
Justice.
The content of the invention
The purpose of the present invention：During by dead-zone fault, existing protection (bus protection, route protection, tranformer protection) is jumped
Lock, using the feature of the circuit breaker current associated with fault zone after tripping operation, the feature of voltage, the feature of measurement impedance, finds
A kind of method of discrimination of one and half main electrical schemes (i.e. 3/2 main electrical scheme) transformer station's dead-zone fault particular location, so as to compress breaker
The fault clearing time of dead-zone fault.
For achieving the above object, the application uses following technical scheme.
A kind of comprehensive distinguishing method of Ge Ban main electrical schemes transformer station dead-zone fault, three breakers connect to form one and half
One string of main electrical scheme；Characterized in that, the comprehensive distinguishing method is comprised the following steps：
Step 1：Three-phase voltage on the three-phase current of Real-time Collection whole transformer station each breaker, each string；
Step 2：Trip signal to bus protection in whole transformer station, route protection, tranformer protection is sampled；
Step 3：Calculate breaker three-phase current, each string on three-phase voltage and residual voltage, breaker it is alternate
Measurement impedance；
Step 4：The trip protection signal failure judgement region sampled using step 2；
Step 5：Using circuit breaker current size after trip protection and the size of wave character, voltage and alternate measurement impedance
Current failure region is judged with the presence or absence of dead-zone fault and carries out dead-zone fault positioning；
Step 6：According to dead-zone fault positioning result, tripping respective circuit breakers thoroughly isolate dead-zone fault.
The present invention further includes following preferred scheme：
In step 3, the three-phase current of the breaker is according to tri- phase currents of IA, IB, IC and IAB, IBC, ICA tri-
Three-phase current distinguishes computational discrimination, and the three-phase voltage on described each string is counted respectively according to tri- voltages between phases of UAB, UBC, UCA
Calculate, the alternate measurement impedance of breaker is calculated respectively according to tri- phase to phase impedance of ZAB, ZBC, ZCA.
In step 4, described fault zone is divided by trip protection signal, the event if I mother's protection acts trip
Barrier region is located at I mothers region, and fault zone is located at II mothers region if II mother's protection acts trip, if circuit or tranformer protection
Then fault zone is located on the circuit or the string where transformer for action tripping operation.
In steps of 5, when bus-bar area is located at according to step 4 failure judgement region：
Judge each while breaker maximum in circuit breaker electric flow valuve being connected with the bus after bus protection action tripping operation；When
When meeting following logical condition, through the first Dead Time definite value delay confirmation after, then failure judgement region exist dead-zone fault and
Dead-zone fault is located at the side breaker, otherwise judges that current failure region does not exist dead-zone fault：
1. any one phase current of the side breaker is more than default first electric current dead band threshold value, and current wave pictograph
Close alternating current feature；
2. any one voltage between phases on string where the side breaker is less than the default first default dead band voltage between phases
Threshold value and the side breaker it is corresponding it is alternate measurement impedance again smaller than default first dead band measure impedance threshold value, or
Residual voltage on string where the side breaker is more than default first dead band residual voltage threshold value.
Wherein, the span of the first electric current dead band threshold value is 0.1In~2In, and In is bis- rated current of CT
Value；Described first default dead band voltage between phases threshold value span is 50V~80V；First dead band measurement impedance threshold value
Span is (10V~30V)/I|10|, wherein I|10|It is the first alternate memory electric current, that is, when receiving bus protection trip signal
The fault current at quarter, the size adjust automatically threshold value according to fault current；The value model of the first dead band residual voltage threshold value
It is 1V~10V to enclose；First Dead Time definite value is adjusted by user, and setting range is 0.1s~2s；The alternating current is characterized in
Refer at least two zero crossings in a power frequency period.
When in steps of 5, on the string where the circuit or transformer is located at according to step 4 failure judgement region, then sentence
Break the string middle breaker whether meet following logical condition, when meeting, through the second Dead Time definite value delay confirmation after, then
In judgement there is dead-zone fault in breaker, otherwise judge that current failure region does not exist dead-zone fault：
1. any one electric current of breaker is more than default second electric current dead band threshold value in this, and current waveform meets
Alternating current feature；
2. any one voltage between phases in this on string where breaker is less than the default second default dead band voltage between phases
Threshold value and in this breaker it is corresponding it is alternate measurement impedance again smaller than default second dead band measure impedance threshold value, or
Residual voltage in this on string where breaker is more than default second dead band residual voltage threshold value.
Wherein, the span of the second electric current dead band threshold value is 0.1In~2In, and In is bis- rated current of CT
Value；Described second default dead band voltage between phases threshold value span is 50V~80V；Second dead band measurement impedance threshold value
Span is (10V~30V)/I|20|, wherein I|20|It is the second alternate memory electric current, that is, receives route protection or transformer is protected
Protect the fault current at trip signal moment, the size adjust automatically threshold value according to fault current；Second dead band residual voltage door
The span of threshold value is 1V~10V；Second Dead Time definite value is adjusted by user, and setting range is 0.1s~2s.
In step (6), when sentence side breaker dead-zone fault when, then the middle open circuit of string where the breaker of the tripping side
The medium voltage side and low-pressure side breaker of the device circuit offside breaker adjacent with the side breaker or transformer；
When sentence middle breaker dead-zone fault when, then the tripping side breaker of string where breaker and open circuit in this in this
The medium voltage side and low-pressure side breaker of the adjacent circuit offside breaker of device or transformer.
The present invention has following beneficial technique effect：
The present invention have selected the open circuit that transformer station occurs dead-zone fault using the comprehensive distinguishing method of transformer station's whole station information
Device unit, safe, quick action, due to the protection that causes of hangover of CT secondary currents after can effectively preventing breaker from disconnecting
Malfunction.At present, the time of existing GPF (General Protection False excision dead-zone fault be about 450ms, use dead-zone fault of the present invention
After discrimination technology scheme, the complete resection time of dead-zone fault is less than 200ms, can effectively prevent from continuing because of fault in ac transmission system
Overlong time triggers the commutation failure of DC converter station, so as to cause the locking of direct current monopole or bipolar locking, is greatly improved electricity
The security margin of Force system operation.
Brief description of the drawings
Fig. 1 is a Ge Ban main electrical schemes transformer station schematic diagram；
Fig. 2 is the comprehensive distinguishing method schematic flow sheet of a Ge Ban main electrical schemes transformer station dead-zone fault；
Fig. 3 is side breaker dead-zone fault comprehensive distinguishing logical schematic；Fig. 4 is middle breaker dead-zone fault comprehensive distinguishing
Logical schematic.
Specific embodiment
Technical scheme is described in further detail with reference to Figure of description.
Fig. 1 is the main electrical scheme Typical Design for Substations of 500kV mono- and half, and between two groups of buses, every three breakers are formed
A string.Often series winding connects two elements (transmission line of electricity or transformer).Equivalent to each half breaker one element of band, therefore it is referred to as
It is bus scheme with one and half breaker, also referred to as 3/2 wiring.3 breaker series connection, shape between 2 buses in one and half modes of connection
Into a string.From an element is drawn between 2 adjacent breakers in a string, i.e., 3 breakers supply two elements, middle interruption
Road device as sharing, equivalent to each element with 1.5 breakers.In a string of one and half wiring, be connected to bus 2 are broken
Road device is referred to as side breaker, and middle breaker is referred to as middle breaker or network interconnecting circuit.In same string, if two
Element is all transmission line of electricity, referred to as line line string；If an element is transmission line of electricity, another element is transformer, referred to as line
Become string.
Main electrical scheme shown in Fig. 1 is breaker one-sided configuration CT, and the application chooses the 4th of the 5041st, 5042 and 5043 compositions
String lists contacts with overseas parties part as typical case's string.
5011st, 5021,5031,5041 is I mother's side breakers, corresponding CT (i.e. current transformer) be respectively CT11,
CT21、CT31、CT41；5012nd, 5022,5032,5042 be middle breaker, corresponding CT be respectively CT12, CT22, CT32,
CT42；5013rd, 5023,5033,5043 is II mothers side breaker, and corresponding CT is respectively CT13, CT23, CT33, CT43.Each
The secondary side of CT has multiple windings, is connected respectively to bus protection, route protection and tranformer protection, so that the 4th goes here and there as an example,
Two Secondary Windings of CT41 are used to I mother's bus protections and L41 route protections respectively, and two Secondary Windings of CT42 are given respectively
L41 route protections and T42 tranformer protections are used, and two Secondary Windings of CT43 are female to T42 tranformer protections and II respectively
Line protection is used, and the size of current of the secondary side of same CT difference winding is identical, the application can appoint take one it is secondary around
Group electric current is sampled and is calculated criterion, and the correctness of result is not influenceed.PT (i.e. voltage transformer) on 4th string has two,
Respectively PT41 and PT42, when carrying out fault distinguishing to 5041 side breakers, electric current uses the secondary current of CT41, voltage to use
The secondary voltage of PT41；When carrying out fault distinguishing to breaker in 5042, electric current using CT42 secondary current, voltage uses
The secondary voltage of PT42；When carrying out fault distinguishing to 5043 side breakers, electric current uses the secondary current of CT43, voltage to use
The secondary voltage of PT42.
F1 trouble points are that on I mother's buses, F2 trouble points are 5041 breaker dead bands, and F3 trouble points are that 5043 breakers are dead
Area, F4 trouble points are breaker dead band in 5024, and F5 trouble points are that on circuit L41, F6 trouble points are on transformer T42.Dead band
The purpose of fault distinguishing is, when different faults position of the trouble point in F1, F2, F3, F4, F5, F6, correctly to select failure
Breaker and its main electrical scheme unit at place, for excision dead-zone fault provides foundation, shorten the whole group mute time of dead-zone fault.
The comprehensive distinguishing method flow that accompanying drawing 2 show Ge Ban main electrical schemes transformer station disclosed by the invention dead-zone fault is shown
Be intended to, the Ge Ban main electrical schemes transformer station shown in accompanying drawing 1 as embodiment, one half main electrical scheme transformer station dead-zone fault
Comprehensive distinguishing method comprise the following steps：
Step 1：Three-phase voltage on the three-phase current of Real-time Collection whole transformer station each breaker, each string；
When CT (CT11, CT21, CT31, CT41), middle CT (CT12, CT22, CT32, CT42), II female CT female to I respectively
The three-phase current of (CT13, CT23, CT33, CT43) is sampled, respectively to the first string PT (PT11, PT12), the second string PT
(PT21, PT22), the 3rd string PT (PT31, PT32), the three-phase voltage of the 4th string PT (PT41, PT42) are sampled, with the 4th
It is example to go here and there, and PT41 and PT42 is only depicted in Fig. 1.
Step 2：Trip signal to bus protection in whole transformer station, route protection, tranformer protection is sampled；
Respectively to I mothers bus protection, II mother's bus protections, two elements (circuit circuit or line transformer) of the first string
Protection, two elements (circuit circuit or line transformer) protection of the second string, two elements (circuit circuit or lines of the 3rd string
Road transformer) protection, the 4th string two elements (L41 circuits and T42 transformers) protection trip signal sampled.
Step 3：Calculate breaker three-phase current, each string on three-phase voltage and residual voltage, breaker it is alternate
Measurement impedance；
The three-phase current of the breaker is according to tri- three-phase currents of tri- phase currents of IA, IB, IC and IAB, IBC, ICA point
Other computational discrimination, the three-phase voltage on described each string is calculated respectively according to tri- voltages between phases of UAB, UBC, UCA, breaker phase
Between measure impedance calculated respectively according to tri- phase to phase impedance of ZAB, ZBC, ZCA.
By taking the 4th of Fig. 1 string as an example, the three-phase current (IA, IB, IC, IAB, IBC, ICA) of CT41, CT42 are calculated respectively
Three-phase current (IA, IB, IC, IAB, IBC, ICA), the three of PT41 of three-phase current (IA, IB, IC, IAB, IBC, ICA), CT43
Phase voltage (UAB, UBC, UCA) and residual voltage, the three-phase voltage (UAB, UBC, UCA) and residual voltage of PT42.
Three alternate measurements impedance (ZAB, ZBC, ZCA) of 5041 breakers are calculated respectively, and voltage is secondary using PT41's
Voltage, electric current uses the secondary current of CT41；Three alternate measurements impedance (ZAB, ZBC, ZCA) of 5042 breakers, voltage is adopted
With the secondary voltage of PT42, electric current using CT42 secondary current；Three of 5043 breakers alternate measurement impedances (ZAB, ZBC,
ZCA), voltage uses the secondary voltage of PT42, electric current to use the secondary current of CT43.Measurement impedance is calculated according to the following formula：
Step 4：The trip protection signal failure judgement region sampled using step 2；
Described fault zone is divided by trip protection signal, and fault zone is located at I if I mother's protection acts trip
Female region, fault zone is located at II mothers region if II mother's protection acts trip, if circuit or tranformer protection action tripping operation
Fault zone is on the string where the circuit or transformer.
In Fig. 1, when F1 or F2 points break down, I female bus protection can be acted, and trip signal be sent, by mother I
The tripping of all side breakers 5011,5021,5031,5041, the present invention carries out event first with the trip signal of I mother's bus protections
Hinder the restriction in region, fault zone is limited to I mother's faulty sections, and the side breaker being associated is 5011,5021,5031,5041.
Step 5：Using circuit breaker current size after trip protection and the size of wave character, voltage and alternate measurement impedance
Judge whether dead-zone fault and carry out dead-zone fault positioning；
When bus-bar area is located at according to step 4 failure judgement region, dead-zone fault differentiates logic as shown in Figure 3：
Judge each while breaker maximum in circuit breaker electric flow valuve being connected with the bus after bus protection action tripping operation；When
When meeting following logical condition, through the first Dead Time definite value Tsq1 delay confirmations after, then failure judgement region there is dead band therefore
Hinder and dead-zone fault is located at the side breaker, otherwise judge that current failure region does not exist dead-zone fault：
1. any one phase current (IA, IB, IC) of the side breaker is more than default first electric current dead band threshold value, and
Current waveform meets alternating current feature；
2. any one voltage between phases (UAB, UBC, UCA) on string where the side breaker is preset less than default first
Dead band voltage between phases threshold value and corresponding alternate measurement impedance (ZAB, ZBC, ZCA) of the side breaker is again smaller than default the
The residual voltage that one dead band is measured on string where impedance threshold value, or the side breaker is electric more than default first dead band zero sequence
Pressure gate threshold value；
Wherein, the span of the first electric current dead band threshold value is 0.1In~2In, and preferred value is 0.5In, and In is
Bis- load current values of CT；Described first default dead band voltage between phases threshold value span is 50V~80V, and preferred value is
60V；The span of the first dead band measurement impedance threshold value is (10V~30V)/I|10|, preferred value is 15V/I|10|, wherein
I|10|It is the first alternate memory electric current, that is, the fault current at bus protection trip signal moment is received, according to the big of fault current
Small adjust automatically threshold value；The span of the first dead band residual voltage threshold value is 1V~10V, and preferred value is 1.5V；First
Dead Time definite value Tsq1 is adjusted by user, and setting range is 0.1s~2s, and preferred value is 0.12s.
By taking accompanying drawing 1 as an example：If F1 point failures, after the tripping of side breaker 5011,5021,5031,5041, failure by into
Work(is isolated, and the electric current of side breaker 5011,5021,5031,5041 is 0, and voltage reverts to rated voltage, and measurement impedance is infinite
Greatly, electric current, voltage, impedor are all returned, and dead band differentiates that logic is returned, will not misoperation.Even if certain side breaker
Electric current has transient process, and CT has tail currents bis- times, and the tail currents are likely larger than the first electric current dead band threshold value, but hangover electricity
Stream is an aperiodic component by exponential damping, and the current waveform does not meet alternating current feature (in a power frequency period
There is no zero crossing point or most only one of which zero crossings), but voltage component and impedor have been returned, and dead band differentiates to be patrolled
Collecting equally can correctly return.
If F2 point failures, after the tripping of side breaker 5011,5021,5031,5041, failure is not isolated, still
Short circuit current is provided F2 points by middle breaker 5042 and circuit L41, and the electric current of side breaker 5041 is maximum, and persistently more than the
One electric current dead band threshold value, and the current waveform meets alternating current feature (interior at least two zero passages of power frequency period
Point), voltage component and measurement impedor are not returned, and dead band differentiates that logic can correctly judge 5041 for dead-zone fault, hair
Trip signal, the breaker (5011 and the 5012 of offside second station) of breaker 5042, circuit L41 offsides in tripping our station will be dead
Area's failure is thoroughly isolated.
When in steps of 5, on the string where the circuit or transformer is located at according to step 4 failure judgement region, dead band
Breakdown judge logic is as shown in Figure 4.
Judge whether the middle breaker of the string meets following logical condition, when meeting, through the second Dead Time definite value
After Tsq2 delay confirmations, then in judging there is dead-zone fault in breaker, otherwise judge that current failure region does not exist dead-zone fault：
1. any one phase current (IA, IB, IC) of breaker is more than default second electric current dead band threshold value in this, and
Current waveform meets alternating current feature；
2. any one voltage between phases (UAB, UBC, UCA) in this on string where breaker is preset less than default second
Dead band voltage between phases threshold value and in this corresponding alternate measurement impedance (ZAB, ZBC, ZCA) of breaker again smaller than default the
Two dead bands measure impedance threshold value, or the residual voltage gone here and there where breaker in this is more than default second dead band zero sequence electricity
Pressure gate threshold value.
Wherein, the span of the second electric current dead band threshold value is 0.1In~2In, and preferred value is 0.5In, and In is
Bis- load current values of CT；Described second default dead band voltage between phases threshold value span is 50V~80V, and preferred value is
60V；The span of the second dead band measurement impedance threshold value is (10V~30V)/I|20|, preferred value is 15V/I|20|, wherein
I|20|It is the second alternate memory electric current, that is, receives the fault current at route protection or tranformer protection trip signal moment, according to
The size adjust automatically threshold value of fault current；The span of the second dead band residual voltage threshold value is 1V~10V, preferred value
It is 1.5V；Second Dead Time definite value Tsq2 is adjusted by user, and setting range is 0.1s~2s, and preferred value is 0.12s.It is same with
As a example by accompanying drawing 1：
When F4 or F5 points break down, the route protection of L41 circuits can be acted, and send trip signal, by this side first station
Breaker 5041,5042 trippings, while the breaker 5011,5022 at tripping offside second station.Dead band differentiate logic first with
The trip signal of L41 route protections carries out the restriction of fault zone, and fault zone is limited on the 4th string, and fault distinguishing flow is such as
Shown in Fig. 2, fault distinguishing logic is as shown in figure 4, below in two kinds of situation：
The first situation, if F5 point failures, after breaker 5041,5042 trippings, failure is isolated, side breaker
5041 and the electric current of middle breaker 5042 be 0, voltage reverts to rated voltage, and measurement impedance is infinity, electric current, voltage, resistance
Anti- element is all returned, and dead band differentiates that logic is returned, will not misoperation.Even if the electric current of 5041 or 5042 breakers has transient state mistake
There are tail currents bis- times in journey, CT, the tail currents are likely larger than the second electric current dead band threshold value, but tail currents be one by
The aperiodic component of exponential damping, the current waveform does not meet alternating current feature (does not have zero crossing in a power frequency period
Point or at most only one of which zero crossing).Because voltage component and impedor have been returned, dead band differentiates that logic equally can be just
Really return.
Second situation, if F4 point failures, after breaker 5041,5042 trippings, failure is not isolated, still by
Side breaker 5043 and transformer T42 provide F4 points short circuit current, and the electric current of middle breaker 5042 is persistently more than the second electric current
Dead band threshold value, and the current waveform meets alternating current feature (at least two zero crossings in a power frequency period), voltage
Element and measurement impedor are not also returned, and dead band differentiation is logically true to judge 5042 for dead-zone fault, sends out trip signal, jumps
The format station side breaker 5043, medium voltage side of transformer T42 and low-pressure side breaker, dead-zone fault is thoroughly isolated.
In Fig. 1, when F3 breaks down trouble point, corresponding II mothers bus protection action tripping operation analyzes process with F2 points, only
It is that fault zone is limited to II mother's faulty sections, the side breaker being associated is 5013,5023,5033,5043.Send out F6 trouble points
During raw failure, the tranformer protection action tripping operation of transformer T42, by Fault Isolation, dead band differentiates that logic can be returned correctly, analyzes
Process is with F5 points.
So, no matter the trouble point of transformer station occurs in any position, and the method can differentiate the side breaker that is out of order
Or fault interrupting road device.
Step 6：According to dead-zone fault positioning result, tripping respective circuit breakers thoroughly isolate dead-zone fault.
When sentence side breaker dead-zone fault when, then the middle breaker of the tripping string where the breaker and this while open circuit
The medium voltage side and low-pressure side breaker of the adjacent circuit offside breaker of device or transformer；
When sentence middle breaker dead-zone fault when, then the tripping side breaker of string where breaker and open circuit in this in this
The medium voltage side and low-pressure side breaker of the adjacent circuit offside breaker of device or transformer.
Above description provides implementation method of the invention simply by means of implementation detail.It is for those skilled in the art
It will be apparent that the invention is not restricted to implementation detail provided above, can be in the case where feature of present invention not be departed from another
Outer implementation detail is realized.Therefore it provides implementation detail should be considered as illustrative and not restrictive.Therefore,
Realize and the use of possibility of the invention is defined by the appended claims.Thus, realize this hair by what claim determined
Bright various selections fall within the scope of the present invention including equivalence enforcement details.
Claims (9)
1. a kind of comprehensive distinguishing method of Ge Ban main electrical schemes transformer station dead-zone fault, three breakers connect to form one and half masters
One string of wiring；It is characterized in that：
Using the feature of the circuit breaker current associated with fault zone after tripping operation, the feature of voltage, the feature of measurement impedance, differentiate
Transformer station's dead-zone fault particular location.
2. a kind of comprehensive distinguishing method of Ge Ban main electrical schemes transformer station dead-zone fault, three breakers connect to form one and half masters
One string of wiring；Characterized in that, the comprehensive distinguishing method is comprised the following steps：
Step 1：Three-phase voltage on the three-phase current of Real-time Collection whole transformer station each breaker, each string；
Step 2：Trip signal to bus protection in whole transformer station, route protection, tranformer protection is sampled；
Step 3：Calculate three-phase current, each three-phase voltage gone here and there and residual voltage, the alternate measurement of breaker of breaker
Impedance；
Step 4：The trip protection signal failure judgement region sampled using step 2；
Step 5：Size using circuit breaker current size after trip protection and wave character, voltage and alternate measurement impedance judges
Current failure region is with the presence or absence of dead-zone fault and carries out dead-zone fault positioning；
Step 6：According to dead-zone fault positioning result, tripping respective circuit breakers thoroughly isolate dead-zone fault.
3. the comprehensive distinguishing method of Ge Ban main electrical schemes transformer station according to claim 2 dead-zone fault, it is characterised in that：
In step 3, the three-phase current of the breaker is according to tri- three-phase currents of tri- phase currents of A, B, C and AB, BC, CA point
Other computational discrimination, the three-phase voltage on described each string is calculated respectively according to tri- voltages between phases of AB, BC, CA, and breaker is alternate
Measurement impedance is calculated respectively according to tri- phase to phase impedance of AB, BC, CA.
4. the comprehensive distinguishing method of Ge Ban main electrical schemes transformer station according to claim 2 dead-zone fault, it is characterised in that：
In step 4, described fault zone is divided by trip protection signal, the faulty section if I mother's protection acts trip
Domain is located at I mothers region, and fault zone is located at II mothers region if II mother's protection acts trip, if circuit or tranformer protection action
Then fault zone is located on the circuit or the string where transformer for tripping operation.
5. the comprehensive distinguishing method of the Ge Ban main electrical schemes transformer station dead-zone fault according to claim 2 or 4, its feature exists
In：
In steps of 5, when bus-bar area is located at according to step 4 failure judgement region：
Judge each while breaker maximum in circuit breaker electric flow valuve being connected with the bus after bus protection action tripping operation；When simultaneously
When meeting following logical condition, through the first Dead Time definite value delay confirmation after, then failure judgement region exist dead-zone fault and
Dead-zone fault is located at the side breaker, otherwise judges that current failure region does not exist dead-zone fault：
1. the electric current of the side breaker is more than default first electric current dead band threshold value, and current waveform meets alternating current spy
Levy；
2. the voltage between phases on the string where the breaker less than default first dead band voltage between phases threshold value and this while break
The alternate measurement impedance of road device is measured on string where impedance threshold value, or the side breaker again smaller than default first dead band
Residual voltage is more than default first dead band residual voltage threshold value.
6. the comprehensive distinguishing method of Ge Ban main electrical schemes transformer station according to claim 5 dead-zone fault, it is characterised in that：
The span of the first electric current dead band threshold value is 0.1In~2In, and In is bis- load current values of CT；
Described first default dead band voltage between phases threshold value span is 50V~80V；
The span of the first dead band measurement impedance threshold value is (10V~30V)/I|10|, wherein I|10|It is the first alternate memory electricity
Stream, that is, receive the fault current at bus protection trip signal moment, the size adjust automatically threshold value according to fault current；
The span of the first dead band residual voltage threshold value is 1V~10V；
First Dead Time definite value is adjusted by user, and setting range is 0.1s~2s；The alternating current feature refers to a work
At least two zero crossings in the frequency cycle.
7. the comprehensive distinguishing method of the Ge Ban main electrical schemes transformer station dead-zone fault according to claim 2 or 4, its feature exists
In：
When in steps of 5, on the string where the circuit or transformer is located at according to step 4 failure judgement region, then judging should
String middle breaker whether simultaneously meet following logical condition, when meeting, through the second Dead Time definite value delay confirmation after, then
In judgement there is dead-zone fault in breaker, otherwise judge that current failure region does not exist dead-zone fault：
1. electric current of breaker is more than default second electric current dead band threshold value in this, and current waveform meets alternating current spy
Levy；
2. the voltage between phases in this on string where breaker is less than the default second default dead band voltage between phases threshold value and is somebody's turn to do
The alternate measurement impedance of middle breaker measures impedance threshold value, or string where breaker in this again smaller than default second dead band
On residual voltage be more than default second dead band residual voltage threshold value.
8. the comprehensive distinguishing method of Ge Ban main electrical schemes transformer station according to claim 7 dead-zone fault, it is characterised in that：
The span of the second electric current dead band threshold value is 0.1In~2In, and In is bis- load current values of CT；
Described second default dead band voltage between phases threshold value span is 50V~80V；
The span of the second dead band measurement impedance threshold value is (10V~30V)/I|20|, wherein I|20|It is the second alternate memory electricity
Stream, that is, receive the fault current at route protection or tranformer protection trip signal moment, and the size according to fault current is adjusted automatically
Whole threshold value；
The span of the second dead band residual voltage threshold value is 1V~10V；
Second Dead Time definite value is adjusted by user, and setting range is 0.1s~2s.
9. the comprehensive distinguishing method of Ge Ban main electrical schemes transformer station according to claim 1 dead-zone fault, it is characterised in that：
In step (6), when sentence side breaker dead-zone fault when, then the middle breaker of string where the breaker of the tripping side and
The medium voltage side and low-pressure side breaker of the adjacent circuit offside breaker of the side breaker or transformer；
When sentence middle breaker dead-zone fault when, then tripping in this side breaker of string where breaker with this in breaker phase
Adjacent circuit offside breaker or the medium voltage side and low-pressure side breaker of transformer.
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| CN107147092A (en) * | 2017-06-30 | 2017-09-08 | 广东电网有限责任公司电力调度控制中心 | One and half main electrical scheme substation line stoppage circuit breaker failure protection implementation methods |
| CN109256861A (en) * | 2018-10-23 | 2019-01-22 | 国电南瑞科技股份有限公司 | A kind of station domain failure protection system and method that more DC grid failures quickly isolate |
| CN111082400A (en) * | 2019-11-19 | 2020-04-28 | 南京国电南自电网自动化有限公司 | Failure protection system and method based on wireless network and station domain information |
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| CN109256861A (en) * | 2018-10-23 | 2019-01-22 | 国电南瑞科技股份有限公司 | A kind of station domain failure protection system and method that more DC grid failures quickly isolate |
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| CN111756021A (en) * | 2020-06-29 | 2020-10-09 | 深圳供电局有限公司 | Line protection current secondary circuit for three-half wiring |
| CN112366664A (en) * | 2020-10-19 | 2021-02-12 | 中国电力科学研究院有限公司 | Method and system for improving relay protection based on 3/2 wiring mode |
| CN112366664B (en) * | 2020-10-19 | 2023-08-18 | 中国电力科学研究院有限公司 | Method and system for improving relay protection based on 3/2 wiring mode |
| CN113671312A (en) * | 2021-08-10 | 2021-11-19 | 中国南方电网有限责任公司超高压输电公司柳州局 | Dead zone fault identification method and load side protection device |
| CN114268081A (en) * | 2021-11-03 | 2022-04-01 | 国网宁夏电力有限公司检修公司 | Identification method, medium and system of primary system operation mode |
| CN114268081B (en) * | 2021-11-03 | 2023-09-12 | 国网宁夏电力有限公司检修公司 | Method, medium and system for identifying operation mode of primary system |
| CN114137337A (en) * | 2021-11-17 | 2022-03-04 | 中国南方电网有限责任公司超高压输电公司广州局 | Automatic inspection method for inspection of converter station CT configuration dead zone |
| CN114137337B (en) * | 2021-11-17 | 2023-11-10 | 中国南方电网有限责任公司超高压输电公司广州局 | Automatic checking method for CT configuration dead zone check of convertor station |
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