CN106771763B - Transform er differential protection analysis system and analysis method - Google Patents
Transform er differential protection analysis system and analysis method Download PDFInfo
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- 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
Abstract
Transform er differential protection analysis system and analysis method are related to differential protection theoretical value analysis method.Currently, a possibility that practical method used when function check that carries out is usually to be separately added into different electric currents in the not ipsilateral of main transformer and verified, and data check malfunctions is big.The present invention includes essential information input module, ratio brake differential action characteristic curve parameter processing module, percentage differential characteristic test point theoretical calculation module, the input of test result and processing module, the preservation of test result and export module and memory module.The technical program, which is first appointed from differential characteristic curve, takes satisfactory point; according to the anti-Critical Theory value for releasing protection act of the point taken; then according to analog quantity added by calculated theoretical value setting tester and actually measured value is fed back in computing system, finally handle calculated result；It can not only accelerate calculating process early period, moreover it is possible to prevent from leading to verify error in data or invalid because error is calculated, improve efficiency.
Description
Technical field
The present invention relates to differential protection theoretical value analysis methods.
Background technique
Transformer is the core of substation, and the debugging of main transformer protection has particularly significant in the debugging process of substation
Meaning.Main protection in main transformer protection is differential protection and non-ionizing energy loss, and in intelligent substation, non-ionizing energy loss is on the spot
Configuration, differential protection are then configured at the indoor intelligent main transformer protection device of relay protection.Main protection of the differential protection as instantaneity, it is right
It is of great significance in the troubles inside the sample space of protection main transformer.Present main transformer protection Differential Protection Theory, mainstream producer are all
It is made into sectional broken line form shown in FIG. 1.Curve shown in FIG. 1 is horizontal, ordinate is respectively braking electricity during differential protection calculates
Stream and difference current, and the method that while actually carrying out function check uses be usually main transformer it is not ipsilateral be separately added into it is different
Electric current is verified, and can not be directly added into difference current and stalling current, therefore will lead to the nothing in practical checking procedure
Method, which is directly found from curve, needs the magnitude of current corresponding to the point that verifies, if while the obtained data of verification do not pass through calculating
Also it can not judge that whether the ratio brake curve characteristic of main transformer protection is correct, can thus reduce the debugging work of differential protection immediately
The efficiency of work, and also increase a possibility that data check malfunctions.
Summary of the invention
The technical problem to be solved in the present invention and the technical assignment of proposition are to be improved and improved to prior art,
Transform er differential protection analysis system is provided, to reduce the purpose for a possibility that data check malfunctions.For this purpose, the present invention take it is following
Technical solution.
Transform er differential protection analysis system transform er differential protection analysis system, it is characterised in that: inputted including essential information
Module, ratio brake differential action characteristic curve parameter processing module, percentage differential characteristic test point theoretical calculation module, test
As a result input and processing module, the preservation of test result and export module and memory module；
Essential information input module: phase is stored in for inputting the parameter information of main transformer protection device, and by parameter information
In the memory module answered；Parameter information includes the differential characteristic characterisitic parameter of ratio brake, the main transformer capacity of adjusting, each side
PT voltage class, each side CT no-load voltage ratio and/or corner mode；
The differential characteristic curve parameter processing module of ratio brake: the parameter information for being stored to essential information input module
It converts, will be converted into using difference current, stalling current as the characteristic equation of variable with first passage electric current, second channel electricity
Stream is the characteristic equation of variable；
Percentage differential characteristic test point theoretical calculation module: for according to the differential characteristic curve parameter processing mould of ratio brake
The calculated result of block selects corresponding parameter, and then selects required test point and calculate corresponding theoretical test parameter；Ginseng
Number includes using first passage electric current, second channel electric current as each section of parameter value range of the characteristic equation of variable, each side of main transformer
The corner mode of secondary rated current and main transformer, it is each in every segment limit after transferring each section of parameter value range of characteristic equation
The point for taking 2 or 2 or more multiplies the coefficient of corresponding secondary rated current and setting according to reconnaissance result, calculates and need to survey
The theoretical value of examination amount；
The input and processing module of test result: it for the input function of check results, and by the check results of typing, removes
With the secondary rated current that is multiplied in theoretical calculation module and setting coefficient, and by processed checking parameter and selected ginseng
Number carries out difference current, stalling current that actual measurement is calculated；According to the actual measurement difference current and stalling current calculating of two points
The actual measurement broken line slope of this section, and corresponding calculated result is shown in interface, so that commissioning staff judges test knot in time
Whether fruit is correct；
The preservation and export module of test result: for the processing of test result processing module to be shown that result saves, with
This test result is checked after convenient.
The technical program at work, first appoints from differential characteristic curve and takes satisfactory point, anti-according to the point taken
The Critical Theory value of protection act is released, analog quantity added by tester is then arranged according to the calculated theoretical value of institute and will be real
Border measured value is fed back in computing system, finally handles calculated result.Theoretical action value " coding " is verified at can be convenient use
The analog quantity of instrument output.
As further improving and supplementing to above-mentioned technical proposal, the invention also includes following additional technical features.
The differential characteristic characterisitic parameter of ratio brake includes the differential characteristic curve equation of one or more ratio brakes,
The differential characteristic curve equation of ratio brake are as follows:
In formula: IdFor the difference current of transformer, IrFor the stalling current of transformer, IcdqdFor differential initiation value, K1For than
The slope of rate retaining differential curve first segment line segment, Ir1For the abscissa of first inflection point of ratio brake non-cumulative curve, K2For song
The slope of line second segment line segment, Ir2For the abscissa of second inflection point of curve, K3For the slope of curve third section ray, IiTo become
Each side electric current of depressor.
The differential characteristic curve parameter processing module of ratio brake passes through conversion relation:
k1=(1+K1/2)/(1-K1/ 2), b1=Icdqd/(1-K1/ 2),
I11=0, I12=(1-K1/2)*Ir1-Icdqd/ 2,
k2=(1+K2/2)/(1-K2/ 2),
b2=(Icdqd+(K1-K2)*Ir1)/(1-K2/ 2), I21=I12,
I22=Ir2*(1-K2/2)-(Icdqd+(K1-K2)*Ir1)/2,
k3=(1+K3/2)/(1-K3/ 2),
b3=(Icdqd+(K1-K2)*Ir1+(K2-K3)*Ir2)/(1-K3/ 2),
I31=I22。
It will be with difference current Ir, stalling current IdIt is converted into for the characteristic equation of variable with first passage electric current I1, it is second logical
Road electric current I2It for the characteristic equation of variable, is shown below, and with first passage electric current I1, second channel electric current I2For variable
Characteristic equation is applied among debugging calculating.
Another object of the present invention is to propose transform er differential protection analysis method comprising following steps:
1) protection equipment for transformer information is created；
2) basic parameter definite value is set, relevant calculation parameter is calculated；
3) the differential broken line initial parameter of ratio brake is set, required broken line calculating parameter is calculated；
4) according to the reconnaissance interval selection checkpoint of calculating, the theoretical parameter of selected checkpoint is calculated；
5) the practical parameter for verifying resulting point of input；
6) check results analyzed, calculated and graphical display.
The utility model has the advantages that
When carrying out main transformer protection verification using computer, which can quickly calculate after inputting setup parameter
Then the parameter area for the point for needing to verify on curve carries out reasonable reconnaissance according to parameter area and is tested, in this way can not only
Enough accelerate calculating process early period, moreover it is possible to prevent from leading to verify error in data or invalid because error is calculated, improve efficiency；
During checking curve, verifying the actual parameter that obtains can be by directly inputting the corresponding region of system
In, and the slope of verification line segment can be calculated immediately to carry out real-time judge, it can find number in time in checking procedure in this way
According to mistake, commissioning staff can take the circumstances into consideration to carry out the verifying again or modification of data by data cases, improve verification data and close
Lattice rate；
After verification, the data in the corresponding table of the system of input can be saved and generate the table of reporting format
Lattice, data processing and filling in for report after can verifying in this way for differential protection bring great convenience, after shortening
The time of phase treatment process.
Detailed description of the invention
Fig. 1 is the sectional broken line figure of main transformer protection Differential Protection Theory.
Fig. 2 is flow chart of the present invention.
Specific embodiment
Technical solution of the present invention is described in further detail below in conjunction with Figure of description.
The present invention is combined using modularization idea, by a complicated Function Decomposition at multiple simple modules, is being transported
Need to only call in calculation needs each module to be used that can be conveniently accomplished function.The module that this system is related to includes: device base
The input of this information and simple process module, the processing of ratio brake differential action characteristic curve parameter and theoretical calculation module,
The input of test result and processing module, the preservation of test result and export module and memory module etc..Followed by each mould
Block is related to the detailed description of function.
(1) input module of device essential information obtains the various parameters information of device by certain input interface, such as
Main transformer capacity, each side PT voltage class, each side CT adjusted in the differential characteristic each characterisitic parameter of ratio brake, device becomes
Than, corner mode of device etc..Program is first passed around after preliminary operation obtains by calling after this module obtains corresponding information
It is continuous to calculate the results of intermediate calculations needed, and be stored in corresponding memory module.
(2) basic function of the differential characteristic curve parameter processing module of ratio brake is the parameter inputted according to input module
The parameter of input is calculated the parameter for being converted into follow-up function and needing to use by information by formula.It is exemplified below:
The deeply auspicious differential characteristic curve equation of device ratio brake in long garden are as follows:
That is K1=0.1, Ir1=Ie, K2=0.5, Ir2=6Ie, K3=0.75.
From formula 1 it is found that the variable of the differential characteristic characteristic equation of ratio brake, in other words percentage differential movement are special
The transverse and longitudinal coordinate of linearity curve is respectively stalling current and difference current, and the two parameters are the intermediate computations of device in verification
Variable, and tester can not directly simulate the two variables, need through the anti-mould that solves instrument and can export of conversion formula
Analog quantity, then carry out actual test.General differential function check carries out between main transformer two sides, i.e., by solving equation operation,If being fixed when testOpposite in phase simultaneously makes I1> I2, then can be with
It is with the calculating formula that the form of phasor modulus value writes out difference current and stalling currentId=I1-I2.It should
Formula brings deep auspicious differential characteristic curve equation into, can solve as follows about I1、I2Differential characteristic equation after treatment it is such as public
Shown in formula 2:
Wherein, the conversion relation of each parameter and untreated differential each parameter of characteristic equation are as follows:
k1=(1+K1/2)/(1-K1/ 2), b1=Icdqd/(1-K1/ 2),
I11=0, I12=(1-K1/2)*Ir1-Icdqd/ 2,
k2=(1+K2/2)/(1-K2/ 2),
b2=(Icdqd+(K1-K2)*Ir1)/(1-K2/ 2), I21=I12,
I22=Ir2*(1-K2/2)-(Icdqd+(K1-K2)*Ir1)/2,
k3=(1+K3/2)/(1-K3/ 2),
b3=(Icdqd+(K1-K2)*Ir1+(K2-K3)*Ir2)/(1-K3/ 2),
I31=I22。
By the conversion of formula 2, with Ir、IdIt is converted into for the characteristic equation of variable with I1、I2For the characteristic equation of variable,
The equation may be directly applied among debugging calculating, facilitate many than original equation.The differential characteristic of ratio brake of the invention is bent
The basic principle of line parameter processing module is based on formula 2.
(3) basic function of percentage differential characteristic test point theoretical calculation module is calculated in differential parameter processing module
After certain result, the calculated result by transferring needs selects certain parameter, and then selects required test point and calculating
Corresponding theoretical test parameter out.
The parameter that this module needs is mainly with I1、I2Each section of parameter value range, main transformer for the characteristic equation of variable are each
The secondary rated current in side and the corner mode of main transformer etc..It, can be at every section after transferring each section of parameter value range of characteristic equation
Respectively take 2 points (more points can be taken, but at least need to take 2, because there are 2 points that can just calculate the oblique of this section in range
Rate).
After transferring the information such as the secondary rated current in each side of main transformer and main transformer corner mode, this module can be according to reconnaissance knot
Fruit multiplies corresponding secondary rated current and coefficient appropriate, calculates the theoretical value for needing test volume.Meanwhile being turned by main transformer
Angle mode may further determine that the mode of test, though this is unrelated with the calculating of system parameter itself, reasonable display can allow verification
Personnel it is relatively sharp know test mode.
(4) input and processing module of test result, as its name suggests, basic function are to provide the typing function of check results
Can, and required result is calculated by processing accordingly.The input function of check results needs specific input port, respectively
It is unlikely to obscure between input port and entanglement.
The processing of check results is then by the check results of typing, divided by the secondary specified electricity multiplied in theoretical calculation module
Stream and corresponding coefficient, and processed checking parameter and selected parameter are subjected to the I that actual measurement is calculatedr、Id, then two
The actual measurement difference current and stalling current I of a pointr1、Id1And Ir2、Id2, pass through formulaCalculate the actual measurement folding of this section
Line slope, and by corresponding Ir、Id, K calculated result be shown in interface, so that commissioning staff judges test result in time
Correctness.
(5) preservation of test result and the basic function of export module are by the processing display knot of test result processing module
Fruit preserves in an appropriate form, to check this test result after facilitating.Test result is in the form of excel table
Test result, clearer can be reacted in standard report template, while can also export the picture of test result by export,
The more intuitively correctness and reliability of performance test result.
By the calling and integration of above several big modules, that is, the general framework for completing system is built and basic function reality
It is existing.By practice test, this modular programming idea brings biggish convenience and preferable effect to the realization of system.
As shown in Fig. 2, transform er differential protection analysis method the following steps are included:
1) protection equipment for transformer information is created；
2) basic parameter definite value is set, relevant calculation parameter is calculated；
3) the differential broken line initial parameter of ratio brake is set, required broken line calculating parameter is calculated；
4) according to the reconnaissance interval selection checkpoint of calculating, the theoretical parameter of selected checkpoint is calculated；
5) the practical parameter for verifying resulting point of input；
6) check results analyzed, calculated and graphical display.
Transform er differential protection analysis method is further explained below by way of specific embodiment demonstration.
(1) protective device information is created, is named such as the deeply auspicious PRS-778S in long garden；
(2) basic parameter definite value is set: such as transformer rated capacity SN=240MVA, high-pressure side voltage rating UHN=230kV, in
Press side voltage rating UMN=115kV, low-pressure side voltage rating ULN=21kV, high-pressure side CT no-load voltage ratio NH=1600/5, medium voltage side CT no-load voltage ratio NM
=2000/5, low-pressure side CT no-load voltage ratio NL=3200/5；Then relevant calculation parameter is calculated, such as the secondary rated current in high-pressure sideThe secondary rated current of medium voltage side
The secondary rated current of low-pressure sideHigh-pressure side coefficient of balance KH=IHe/IHe=1,
Medium voltage side coefficient of balance KM=IHe/IMe=0.625, low-pressure side coefficient of balance KL=IHe/ILe=0.181；
(3) the differential broken line initial parameter of ratio brake is set, the differential refractive line equation setup parameter of following ratio brake is such as pressed:
Wherein, i.e. K1=0.1, Ir1=Ie, K2=0.5, Ir2=6Ie, K3=0.75, Icdqd=0.5Ie。
It willId=I1-I2, bring refractive line equation into, arrangement can obtain:
Then following result can be calculated:
k1=(1+K1/2)/(1-K1/ 2)=1.105,
b1=Icdqd/(1-K1/ 2)=0.526,
I11=0, I12=(1-K1/2)*Ir1-Icdqd/ 2=0.7IHe,
k2=(1+K2/2)/(1-K2/ 2)=1.667,
b2=(Icdqd+(K1-K2)*Ir1)/(1-K2/ 2)=0.133,
I21=I12=0.7IHe,
I22=Ir2*(1-K2/2)-(Icdqd+(K1-K2)*Ir1)/2=4.45He,
k3=(1+K3/2)/(1-K3/ 2)=1.857,
b3=(Icdqd+(K1-K2)*Ir1+(K2-K3)*Ir2)/(1-K3/ 2)=- 0.714,
I31=I22=4.45IHe。
(4) according to calculated reconnaissance interval selection checkpoint: first segment takes Ic21=0, Ic22=0.5IHe, then can calculate
I outc11=0.526IHe、Ic12=1.079IHe.Take I2For high-pressure side, I1For medium voltage side, since corner mode is Y- > Δ mode,
Then high-pressure side and medium voltage side add and need to multiply when monophase currentThen for first point, high-pressure side need to actually add electric current Isj21=
0A, medium voltage side need to actually add electric currentFor second
A, high-pressure side need to actually add electric currentMedium voltage side need to actually add electric current
(5) practical checking procedure is as follows:
Point 1: high-pressure side adds Isj21, medium voltage side first adds electric current to be slightly less than Isj11, protection is failure to actuate；It is slowly increased medium voltage side electricity
Stream arrives about Isj11When should act, write down action current Isj11′；
Point 2: the similar point 1 of way can obtain action current Isj12′。
(6) the practical parameter for verifying resulting point of input, and analyzed, calculated, graphical display:
Utilize Isj21、Isj11' and Isj22、Isj12' I can be calculated separately outsjr1、Isjd1With Isjr2、Isjd2, then first can be calculated
The actual measurement slope K of section1'=(Isjd2-Isjd1)/(Isjr2-Isjr1), calculated result is compared with actually, output formats and figure.
Transform er differential protection analysis system and analysis method shown in figure 2 above are specific embodiments of the present invention,
Substantive distinguishing features of the present invention and progress are embodied, shape can be carried out to it under the inspiration of the present invention using needs according to actual
The equivalent modifications of shape, structure etc., the column in the protection scope of this programme.
Claims (4)
1. transform er differential protection analysis system, it is characterised in that: special including essential information input module, ratio brake differential action
The input and processing module, survey of linearity curve parameter processing module, percentage differential characteristic test point theoretical calculation module, test result
The preservation of test result and export module and memory module；
Essential information input module: it is stored in accordingly for inputting the parameter information of main transformer protection device, and by parameter information
In memory module；Parameter information includes the differential characteristic characterisitic parameter of ratio brake, the main transformer capacity of adjusting, each side PT electricity
Press grade, each side CT no-load voltage ratio and corner mode；
The differential characteristic curve parameter processing module of ratio brake: the parameter information for storing to essential information input module carries out
Conversion, will be with difference current (Id), stalling current (Ir) be converted into for the characteristic equation of variable with first passage electric current (I1),
Two channel current (I2) be variable characteristic equation, and according to using first passage electric current, second channel electric current as the characteristic of variable
Equation carries out subsequent debugging and calculates；
Percentage differential characteristic test point theoretical calculation module: for according to the differential characteristic curve parameter processing module of ratio brake
Calculated result selects corresponding parameter, and then selects required test point and calculate corresponding theoretical test parameter；Parameter packet
It includes secondary as each section of parameter value range of the characteristic equation of variable, each side of main transformer using first passage electric current, second channel electric current
The corner mode of rated current and main transformer takes 2 after transferring each section of parameter value range of characteristic equation in every segment limit
Or 2 or more points, the coefficient of corresponding secondary rated current and setting is multiplied according to reconnaissance result, calculates and needs test volume
Theoretical value；
The input and processing module of test result: for the input function of check results, and by the check results of typing, divided by reason
By the secondary rated current that is multiplied in computing module and setting coefficient, and by processed checking parameter and selected parameter into
Difference current, the stalling current of actual measurement is calculated in row；The section is calculated according to the actual measurement difference current of two points and stalling current
Actual measurement broken line slope, and corresponding calculated result is shown in interface, so that commissioning staff judges that test result is in time
It is no correct；
The preservation and export module of test result: for the processing of test result processing module to be shown that result saves, with convenient
This test result is checked later.
2. transform er differential protection analysis system according to claim 1, it is characterised in that: the differential characteristic curve of ratio brake
Characterisitic parameter include one or more differential characteristic curve equation of ratio brake, the differential characteristic curve equation of ratio brake are as follows:
In formula: IdFor the difference current of transformer, IrFor the stalling current of transformer, IcdqdFor differential initiation value, K1For ratiometric
The slope of moment moving curve first segment line segment, Ir1For the abscissa of first inflection point of ratio brake non-cumulative curve, K2For curve
The slope of two sections of line segments, Ir2For the abscissa of second inflection point of curve, K3For the slope of curve third section ray, IiFor transformer
Each side electric current.
3. transform er differential protection analysis system according to claim 2, it is characterised in that: the differential characteristic curve of ratio brake
Parameter processing module will be with difference current I by certain conversion relationdWith stalling current IrFor the differential side of ratio brake of variable
Journey group is converted to following with I1、I2For the equation group of variable:
Wherein I1And I2First passage electric current and second channel electric current respectively described in claim 1, other parameters are to weigh
Benefit require 2 described in the differential characteristic curve equation of ratio brake be according to by the conversion amount of obtaining, each parameter of the equation and power
Benefit requires the conversion relation between each parameter of the differential characteristic curve equation of the ratio brake in 2 following various shown:
k1=(1+K1/2)/(1-K1/ 2), b1=Icdqd/(1-K1/ 2),
I11=0, I12=(1-K1/2)*Ir1-Icdqd/ 2,
k2=(1+K2/2)/(1-K2/ 2),
b2=(Icdqd+(K1-K2)*Ir1)/(1-K2/ 2), I21=I12,
I22=Ir2*(1-K2/2)-(Icdqd+(K1-K2)*Ir1)/2,
k3=(1+K3/2)/(1-K3/ 2),
b3=(Icdqd+(K1-K2)*Ir1+(K2-K3)*Ir2)/(1-K3/ 2),
I31=I22；
It will be with difference current Ir, stalling current IdIt is converted into for the characteristic equation of variable with first passage electric current I1, second channel electricity
Flow I2For the characteristic equation of variable, and with first passage electric current I1, second channel electric current I2It is applied to adjust for the characteristic equation of variable
Among examination calculates.
4. using the transform er differential protection analysis method of transform er differential protection analysis system described in claim 1, feature exists
In the following steps are included:
1) protection equipment for transformer information is created；
2) basic parameter definite value is set, relevant calculation parameter is calculated；
3) the differential broken line initial parameter of ratio brake is set, required broken line calculating parameter is calculated；
4) according to the reconnaissance interval selection checkpoint of calculating, the theoretical parameter of selected checkpoint is calculated；
5) the practical parameter for verifying resulting point of input；
6) check results analyzed, calculated and graphical display.
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| CN117169640B (en) * | 2023-11-02 | 2024-02-20 | 云南电力试验研究院(集团)有限公司 | Multiple ratio differential verification method and device under multi-distributed new energy access feeder line |
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