CN109390939A - A kind of bus based on amperometry falls the differential diagnostic method that isolation plug-in strip not exclusively closes a floodgate when arranging operation - Google Patents
A kind of bus based on amperometry falls the differential diagnostic method that isolation plug-in strip not exclusively closes a floodgate when arranging operation Download PDFInfo
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- CN109390939A CN109390939A CN201811405197.1A CN201811405197A CN109390939A CN 109390939 A CN109390939 A CN 109390939A CN 201811405197 A CN201811405197 A CN 201811405197A CN 109390939 A CN109390939 A CN 109390939A
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- 238000002955 isolation Methods 0.000 title claims abstract description 55
- 238000004082 amperometric method Methods 0.000 title claims abstract description 15
- 238000002405 diagnostic procedure Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000004891 communication Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000002159 abnormal effect Effects 0.000 claims abstract description 5
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000004069 differentiation Effects 0.000 abstract description 3
- 241001269238 Data Species 0.000 abstract 1
- 230000001268 conjugating effect Effects 0.000 abstract 1
- 230000009467 reduction Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000009466 transformation Effects 0.000 description 3
- 238000012790 confirmation Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- H02J3/005—
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention discloses a kind of buses based on amperometry to fall to be isolated when row operates the differential diagnostic method that plug-in strip not exclusively closes a floodgate, by obtaining the load current of relevant device with existing measure and control device data communication, state position, conjugating the real time datas such as information, as the input information source for implementing the method for the present invention.Set model and algorithm carry out processing operation to these data and information according to the present invention.When operation result determines that corresponding isolation switch closes a floodgate abnormal to existing TT&C system or anti-misoperation apparatus output block signal or warning information.Isolation plug-in strip closes a floodgate when can be to solve the above-mentioned row's of falling operation, and whether completely reliable differentiation problem provides completely new solution, to ensure the safe operation and reliable power supply of substation.
Description
Technical field
The invention belongs to the bus fields of falling drainage technique, and in particular to a kind of bus based on amperometry fall to arrange operation after
The differential diagnostic method not exclusively to close a floodgate from plug-in strip.
Background technique
Double bus scheme mode is due to it has both the outstanding feature of reliability and flexibility in the power transformation of various voltage class
It is widely adopted in standing.Under this mode of connection, visually operation needs can be at two for route or element (referring mainly to transformer)
Flexibly switched between bus.This handover operation is in industry referred to as " arranging " operation.Wherein route or element not
The row's of the falling operation carried out under conditions of power failure is referred to as " heat is fallen ", otherwise the row's of the falling operation carried out under the conditions of power failure is referred to as
" cold fall ".It is required to restrict by power supply reliability, the former has higher probability.
There are a final steps in " heat is fallen " operation, i.e., switching object first is used to be connected to the one of target bus
Isolation switch is closed.Currently, checking confirmation isolation switch in row's operation since isolation switch does not have any measurement to equip
Combined floodgate situation there is no the technological means of mature and reliable, rely primarily on the visual inspection of operator at the scene.But by operator
Observation condition (illumination, angle, distance) and self-condition (experience, technical ability, eyesight) limitation and with very big uncertain
Property.Thus become the short slab in power industry anti-misoperation mechanism and system, also seriously constrains the sequencing, automatic of substation
Change, intelligent and remote control grid switching operation realization and popularization.More seriously, he is substation or even electric power netting safe running
One insoluble hidden danger.
In view of the above-mentioned problems, the country is also it has been proposed that following solution:
1) method of isolation switch electric current is calculated come detection and isolation disconnecting link based on small female difference in double-bus bus differential protection
Combined floodgate situation.
2) design installation isolation switch contact resistance on-line measurement device is with the combined floodgate situation of detection and isolation disconnecting link.
In the various factors for influencing electric power netting safe running, human factor is factor least determining and most rambunctious.Cause
This, substation, which falls, arranges combined floodgate situation the showing by the visual inspection of operator at the scene that confirmation isolation switch is checked in operation
Shape is difficult to receive on long terms.It not only realizes that automation, intelligentized developing goal are runed counter to operation of power networks, more because of it
The uncertainty of presentation restricts the promotion of the safety operation level of substation or even power grid seriously.Above-mentioned other solution party
Case is also difficult to be engineered application because of many restrictions.
It is the method that isolation switch electric current is calculated based on small female difference in double-bus bus differential protection first.There are persons to be difficult to for it
The two large problems of solution.First is that the realization of the program needs to modify the computation model of bus differential protection.And bus differential protection is power train
It unites one of most important device, it is highly sensitive and there is very high threshold to modify its computation model.Followed by its application will increase
The complexity (such as during the row of falling needing that the number of converting to will be protected) of operation is run, and the raising of this complexity also implies that
The reduction of operational safety, overall effect are to be worth discussion, also can be by very big resistance in popularization.
No matter followed by designing the scheme of installation contact resistance on-line measurement device for isolation switch and its technical solution being
No reliable, rationally (isolation switch is large in number and widely distributed) whether, just the operation and maintenance of so a large amount of devices itself undoubtedly can be big for economy
The burden of width increase run unit.The difficulty of popularization can infer.
Summary of the invention
In order plug-in strip combined floodgate to be isolated when the row's of falling operation, whether completely reliable differentiation problem provides completely new solution party to the present invention
Case, to ensure the safe operation and reliable power supply of substation.
The present invention solves its technical problem and is achieved through the following technical solutions:
A kind of bus based on amperometry falls the differential diagnostic method that isolation plug-in strip not exclusively closes a floodgate when arranging operation, including
Following steps:
Establish the equivalent model of double bus scheme circuit；
Acquire real-time load current, state position, displacement information；
Algorithm is reduced according to equivalent model and error, and processing operation is carried out to collected data information；
The operation result obtained after processing operation is determined, it is defeated when operation result determines that isolation switch closes a floodgate abnormal
Block signal or warning information out.
Further, double bus scheme circuit includes I sections of buses, II sections of buses, the circuit component of falling winding displacement, the circuit components of falling winding displacement
On isolation switch G1 and isolation switch G2, mother；
The isolation switch G1 is equivalent to contact resistance RG1；
The isolation switch G2 is equivalent to contact resistance RG2；
The busbar breaker ML is equivalent to contact resistance RML；
It further include the equivalent current source I of external circuitMX, the equivalent resistance R of I sections of busesM1, the equivalent resistance R of II sections of busesM2；
The contact resistance RMLIt is connected on I sections of buses and II sections of buses, the equivalent resistance RM1With equivalent resistance RM2And
Join current source IMX, the contact resistance RG1With contact resistance RG2Parallel-current source IMX。
Further, according to equivalent model, in the case where there is electric current transmission on I sections of buses and II sections of buses, contact electricity
Hinder RMLThe variation of branch current can reflect contact resistance R indirectlyG1Variation, thus realize by analysis busbar breaker
Curent change determines the combined floodgate situation of isolation switch G1.
Further, the error reduction algorithm includes:
When isolation switch G1 closes a floodgate, mother electric current IMLWith contact resistance RG1There are determining proportional relations, then use
IML/ImxTo characterize contact resistance RG1Size and as differentiate isolation switch G1 close a floodgate whether complete main criterion, wherein
ImxIt is the electric current that busbar breaker is flowed through when closing a floodgate, I for isolation switch G1mxEach corresponding line can be obtained or acquired from bus differential protection
It calculates and obtains after the measurement data of circuit component, the entry condition of calculating is obtained by obtaining the displacement signal of isolation switch G1.
Further, the error reduction algorithm includes:
By the increment △ I of alternate out-of-balance currentMLOr IML/ImxUneven increment △ (IML/Imx) it is used as contact resistance
RG1The assistant criteria of variation.
Further, the error reduction algorithm includes:
Since the Imx in equivalent model passes through ∑ IIOr ∑ IIIGained is calculated, therefore can be made
Error is reduced with the method for error balance.
Further, the error reduction algorithm includes:
By measuring ∑ I in non-faultingI、∑IIIAnd mother electric current IMLRelative error, and dynamic generation one
Correction value is modified when starting and calculating.
Further, the error reduction algorithm includes:
According to the method that bus differential protection is adjusted, operation result is modified with one 1.3~1.5 coefficient.
Further, the output of signal is that communication interface exports or relay tip exports.
The invention has the benefit that
(1) adaptability and versatility.Since double bus scheme mode is a kind of Classic couture scheme of substation, design
It early has been standardized, using early generalization.Therefore the method for the invention can be widely applied to the power transformation of various voltage class, form
It stands, power plant.
(2) simple and easy.Since the application of the method for the present invention does not need to be modified existing equipment, operation not will increase
The homework burden of personnel will not adversely affect existing equipment.Only need to establish data communication or hardware simplicity connection (after
The output of electric appliance contact) it can be realized.
(3) economical and efficient.It, can be with software package, function mould since dependence of the present invention to hardware carrier and platform is minimum
The variforms such as block or individual components realize application, less investment, significant effect.It can effectively solve an anti-error behaviour of electric system
Make short slab, input-output ratio is obvious.
Detailed description of the invention
Fig. 1 is principle of the invention block schematic illustration；
Fig. 2 is typical double bus scheme schematic diagram；
Fig. 3 is the simplified wiring schematic diagram of Fig. 2；
Fig. 4 is the wiring schematic diagram after Fig. 3 equivalent；
Fig. 5 is equivalent model schematic diagram of the invention.
Specific embodiment
Below by specific embodiment, the invention will be further described, and it is not limit that following embodiment, which is descriptive,
Qualitatively, this does not limit the scope of protection of the present invention.
As shown in Figure 1, the present invention (determines down row behaviour according to current method of operation information and displacement information by data prediction
Make object and filter out required operational data), processing operation, equivalent model and output four parts composition.Output par, c can divide
For soft output (communication interface) and hard output (relay tip) two ways, to adapt to the different needs at scene.
A kind of bus based on amperometry of the invention falls to be isolated when arranging operation the antidiastole that plug-in strip not exclusively closes a floodgate
Method includes the following steps:
Establish the equivalent model of double bus scheme circuit；It is illustrated in figure 2 typical double bus scheme figure, including I sections of mothers
Line, II sections of buses, circuit element L11、L12To L1N, circuit element L21、L22To L2N, isolation switch G1 and isolation switch G2 are female
Connection.L in figure11、L12To L1NIt is connected to I sections of buses, L21、L22To L2NIt is connected to II sections of buses.If L2NIt need to be fallen from II sections of bus heat
To I sections of buses, by operation order Ying Xianhe isolation switch G1, then isolation switch G2 is drawn.To prevent isolation switch G1 from not exclusively closing
Lock (phase or two-phase) causes isolation switch G2 on-load to be operated a switch, need to the combined floodgate situation to isolation switch G1 determine.
For the situation before the combined floodgate convenient for analyzing isolation switch G1, wiring shown in Fig. 1 can be reduced to the electricity of wiring shown in Fig. 3
Road.Fig. 3 is reduced to shown in Fig. 4 again, wherein isolation switch G1 is equivalent to contact resistance RG1, it is electric that isolation switch G2 is equivalent to contact
Hinder RG2, busbar breaker ML is equivalent to contact resistance RML, further include the equivalent resistance R of I sections of busesM1, the equivalent electricity of II sections of buses
Hinder RM2。
Fig. 4 equivalent circuit can be formed to the equivalent model of similar bridge circuit shown in Fig. 5 after proper transformation.Due to mother
The electric current of each branch is determined by respective supply voltage and load characteristic on line, not by contact resistance RG1, contact resistance
RG2, bypass breaker contact resistance RMLEqual contact resistance variations influence, therefore its external circuit can use a current source IMXInstead of.
Bypass breaker contact resistance R in Fig. 4MLIt is connected on I sections of buses and II sections of buses, equivalent resistance RM1With equivalent resistance RM2And
Join current source IMX, contact resistance RG1With contact resistance RG2Parallel-current source IMX。
By obtaining real-time load current, state position, displacement information with existing measure and control device data communication；It obtains
State position and displacement information, primarily to knowing which route or member be respectively connected on current I sections of bus and II sections of buses
Part, to carry out algebraical sum operation to the line load electric current being connected on same bus.
Algorithm is reduced according to equivalent model and error, and processing operation is carried out to collected data information；According to equivalent mould
Type, by the analysis of bridge circuit it is found that if setting R in Fig. 5 modelG1=RG2, RM1=RM2.Then contact resistance RMLElectric current in branch
It is 0, being equivalent to down isolation switch G1 combined floodgate in row's operation, normally contact is good, contact resistance RG1For normal value, with isolation knife
The contact resistance R of lock G2G2Quite.At this point, contact resistance RMLElectric current is smaller in branch or is 0.Once isolation switch G1 closes a floodgate different
Often, poor contact is equivalent in contact resistance RG1On attached a △ RG1.It at this time will be in contact resistance RMLIt is produced in branch
Raw corresponding electric current.That is, in addition to above-mentioned ideal situation, in RM1≠RM2As long as two can be calculated in the case of
In the case where transmission electric current between bus, contact resistance RMLThe variation of branch current can reflect contact resistance R indirectlyG1
Variation, specifically, isolation switch G1 close after under the action of shunting, the electric current I of busbar breakerMLIt can change, this
The increment of variation can reflect contact resistance R indirectlyG1Variation, thus realize by analysis busbar breaker curent change come
Determine the combined floodgate situation of isolation switch G1.When power-balance on I sections of buses and II sections of buses, between I sections of buses and II sections of buses
There is no electric current to transmit, the combined floodgate situation of isolation switch G1 cannot be determined by analysis busbar breaker curent change.
In practical projects, equivalent resistance RM1With equivalent resistance RM2And unequal, contact resistance RG1With contact resistance RG2?
There is certain discrete range.System operation mode and load current variation also can be to bypass breaker contact resistance RMLThe electricity of branch
Stream produces a very large impact and the factors such as current transformer error characteristic can all be formed in various degree above-mentioned calculating and differentiation
Error and interference need to reduce algorithm and measure by error appropriate to be excluded as much as possible.
It is as follows that error provided by the present invention reduces algorithm:
(A) when G1 closes a floodgate, the electric current I of busbar breakerMLWith contact resistance RG1There are determining proportional relation,
Then use IML/ImxTo characterize contact resistance RG1Size and as differentiate G1 close a floodgate whether complete main criterion, due to power grid
For trend (load) always among different variations, cannot be distinguished with busbar breaker curent change increment merely is isolation switch
G1 closes a floodgate caused by abnormal caused or electric network swim variation.Therefore I is usedML/ImxElectric network swim can be excluded as criterion to become
Change caused by change.Wherein, ImxIt is the electric current that busbar breaker is flowed through when closing a floodgate, I for isolation switch G1mxIt can be from bus differential protection
Acquisition is calculated after obtaining or acquiring the measurement data of each respective lines element, the entry condition of calculating is believed by obtaining the displacement of G1
Number obtain.
It (B) usually only can a phase or two-phase (three-phase while generation and almost the same feelings in view of incomplete combined floodgate occurs
Condition probability is too low not to be considered).Therefore it will necessarily reflect mother electric current IMLThe I of three-phase imbalance or three-phaseML/ImxNo
Balance is come above.If by mother electric current IMLIncrement △ IMLOr IML/ImxUneven increment △ (IML/Imx) as contact
Resistance RG1The assistant criteria of variation.
(C) since the Imx in equivalent model passes through ∑ IIOr ∑ IIIGained is calculated, therefore can be madeError is reduced with the method for error balance.
(D) by measuring ∑ I in non-faultingI、∑IIIAnd mother electric current IMLRelative error, and press dynamic generation
One correction value is modified when starting and calculating.According to Kirchhoff's law, the algebra of all branch currents of bus is flowed into
Be 0.If not 0, this difference is exactly error amount.Not High Water will be can get by calculating by a certain period of time continuous sampling
Corresponding error amount is flowed down, is stored in database after tending towards stability.For calculating used in amendment.
(E) method adjusted according to bus differential protection, operation result is modified with one 1.3~1.5 coefficient.
The above-mentioned algorithm of integrated use and measure, can be such that the error of calculated result is preferably minimized.
Obtained operation result is determined, exports block signal when operation result determines that isolation switch closes a floodgate abnormal
Or warning information.
The carrier for implementing the method for the invention can be a software package or software module, be embedded in existing observing and controlling dress
It sets, in monitoring system or anti-misoperation apparatus/system.It may be designed as separate physical device and pass through data communication and existing dress
Set/system paired running.Existing electric substation automation system can be even incorporated by 61850 agreements plays efficiency.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of bus based on amperometry falls to be isolated when arranging operation the differential diagnostic method that plug-in strip not exclusively closes a floodgate, feature
It is: includes the following steps:
Establish the equivalent model of double bus scheme circuit；
Acquire real-time load current, state position, displacement information；
Algorithm is reduced according to equivalent model and error, and processing operation is carried out to collected data information；
When operation result determines that isolation switch closes a floodgate abnormal, output, which is closed, is determined to the operation result obtained after processing operation
Lock signal or warning information.
2. a kind of bus based on amperometry as described in claim 1 falls to be isolated when arranging operation the mirror that plug-in strip not exclusively closes a floodgate
Other diagnostic method, it is characterised in that: double bus scheme circuit includes I sections of buses, II sections of buses, the circuit component of falling winding displacement, the winding displacement that falls
Isolation switch G1 and isolation switch G2, mother on circuit component；
The isolation switch G1 is equivalent to contact resistance RG1；
The isolation switch G2 is equivalent to contact resistance RG2；
The busbar breaker ML is equivalent to contact resistance RML；
It further include the equivalent current source I of external circuitMX, the equivalent resistance R of I sections of busesM1, the equivalent resistance R of II sections of busesM2；
The contact resistance RMLIt is connected on I sections of buses and II sections of buses, the equivalent resistance RM1With equivalent resistance RM2Electricity in parallel
Stream source IMX, the contact resistance RG1With contact resistance RG2Parallel-current source IMX。
3. a kind of bus based on amperometry as claimed in claim 2 falls to be isolated when arranging operation the mirror that plug-in strip not exclusively closes a floodgate
Other diagnostic method, it is characterised in that: connect according to equivalent model in the case where there is electric current transmission on I sections of buses and II sections of buses
Electric shock resistance RMLThe variation of branch current can reflect contact resistance R indirectlyG1Variation, to realize disconnected by analysis mother
Road device curent change determines the combined floodgate situation of isolation switch G1.
4. a kind of bus based on amperometry as claimed in claim 3 falls to be isolated when arranging operation the mirror that plug-in strip not exclusively closes a floodgate
Other diagnostic method, it is characterised in that: the error reduces algorithm and includes:
When isolation switch G1 closes a floodgate, mother electric current IMLWith contact resistance RG1There are determining proportional relations, then use IML/
ImxTo characterize contact resistance RG1Size and as differentiate isolation switch G1 close a floodgate whether complete main criterion, wherein ImxFor
Isolation switch G1 is the electric current that busbar breaker is flowed through when closing a floodgate, ImxEach respective lines element can be obtained or acquired from bus differential protection
Measurement data after calculate and obtain, the entry condition of calculating is obtained by obtaining the displacement signal of isolation switch G1.
5. a kind of bus based on amperometry as claimed in claim 3 falls to be isolated when arranging operation the mirror that plug-in strip not exclusively closes a floodgate
Other diagnostic method, it is characterised in that: the error reduces algorithm and includes:
By the increment △ I of alternate out-of-balance currentMLOr IML/ImxUneven increment △ (IML/Imx) it is used as contact resistance RG1Become
The assistant criteria of change.
6. a kind of bus based on amperometry as claimed in claim 3 falls to be isolated when arranging operation the mirror that plug-in strip not exclusively closes a floodgate
Other diagnostic method, it is characterised in that: the error reduces algorithm and includes:
Since the Imx in equivalent model passes through ∑ IIOr ∑ IIIGained is calculated, therefore can be madeFortune
Error is reduced with the method for error balance.
7. a kind of bus based on amperometry as claimed in claim 3 falls to be isolated when arranging operation the mirror that plug-in strip not exclusively closes a floodgate
Other diagnostic method, it is characterised in that: the error reduces algorithm and includes:
By measuring ∑ I in non-faultingI、∑IIIAnd mother electric current IMLRelative error, and dynamic generation one amendment
Value is modified when starting and calculating.
8. a kind of bus based on amperometry as claimed in claim 3 falls to be isolated when arranging operation the mirror that plug-in strip not exclusively closes a floodgate
Other diagnostic method, it is characterised in that: the error reduces algorithm and includes:
According to the method that bus differential protection is adjusted, operation result is modified with one 1.3~1.5 coefficient.
9. a kind of bus based on amperometry as described in claim 1 falls to be isolated when arranging operation the mirror that plug-in strip not exclusively closes a floodgate
Other diagnostic method, it is characterised in that: the output of signal is that communication interface exports or relay tip exports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811405197.1A CN109390939B (en) | 2018-11-23 | 2018-11-23 | Differential diagnosis method for incomplete closing of isolation knife switch during bus inversion operation based on current analysis |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811405197.1A CN109390939B (en) | 2018-11-23 | 2018-11-23 | Differential diagnosis method for incomplete closing of isolation knife switch during bus inversion operation based on current analysis |
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| CN109390939A true CN109390939A (en) | 2019-02-26 |
| CN109390939B CN109390939B (en) | 2021-10-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112630582A (en) * | 2021-03-09 | 2021-04-09 | 广东电网有限责任公司佛山供电局 | GIS loop defect diagnosis method and system based on hot bus inversion operation |
| CN113595250A (en) * | 2021-09-15 | 2021-11-02 | 广东电网有限责任公司 | Automatic analysis method and system for abnormal opening and closing positions of GIS (gas insulated switchgear) bus disconnecting link |
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