CN108108343A - A kind of field adjustable method of tractive transformer biased differential protection - Google Patents
A kind of field adjustable method of tractive transformer biased differential protection Download PDFInfo
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- CN108108343A CN108108343A CN201711430256.6A CN201711430256A CN108108343A CN 108108343 A CN108108343 A CN 108108343A CN 201711430256 A CN201711430256 A CN 201711430256A CN 108108343 A CN108108343 A CN 108108343A
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Abstract
The present invention relates to the debugging of tractive transformer biased differential protection, are specially a kind of method that tractive transformer biased differential protection field adjustable is carried out using EXCEL office softwares.This method is verified mainly for tractive transformer percentage differential curve; EXCEL office softwares make use of to carry out integrated treatment to test data; after the basic fundamental parameter of transformer type and differential protection is confirmed; each formula can be calculated in advance and inputted in EXCEL office softwares; so that greatly reducing in the operand that Commissioning field carries out, efficiency is improved.It and eliminates and generates error because field adjustable personnel carry out a large amount of computings so that the judgement of differential protection protection feature is had an impact.Methodological science of the present invention is effective, technologically advanced, has higher use value, improves work efficiency, saved a large amount of human and material resources costs, ensure that duration and quality.
Description
Technical field
The present invention relates to the debugging of tractive transformer biased differential protection, be specially it is a kind of using EXCEL office softwares into
The method of row tractive transformer biased differential protection field adjustable.
Background technology
Differential protection is a kind of protection formed by more each side size of current and phase.Although each side electric current of transformer
It differs, and it is not connected on circuit between each side, but can be worked normally according to main transformer and occur to flow during main transformer external short circuit
Enter and the sum of the ampere-turn that power is equal or each side electric current generates that flows out transformer is approximately that zero condition establishes differential balance
Equation when inside transformer breaks down, should have difference current to flow through differential circuit, differential relay action, this is simply managed
Think situation.But actually due to each side CT models of main transformer, no-load voltage ratio, calculate no-load voltage ratio, magnetic saturation characteristic, exciting current and main transformer combined floodgate
When the influences such as excitation surge current, difference flows back to road, and unavoidably there are out-of-balance currents；Once out-of-balance current is more than differential relay
When device acts setting valve, differential malfunction can be caused.The generation of out-of-balance current mainly has following three kinds of methods in order to prevent：1、
Differential malfunction caused by prevent out-of-balance current caused by transformer excitation flow, transform er differential protection is using interruption
Angle, secondary harmonic brake principle, waveform symmetry principle escape the influence of transformer excitation flow；2nd, it is to prevent both sides CT models not
Cause differential protection misoperation with generated out-of-balance current, then increase starting current value is used to avoid main transformer protection scope
Maximum imbalance current during external short circuit short circuit；3rd, for prevent the wiring group because of transformer, caused by CT no-load voltage ratio differences not
Balanced balanced current, then carrying out phase compensation and current values compensation using software makes it tend to balance.Cause uneven electricity except above
Outside the factor of stream, it is also necessary to take into account that the increase of short circuit current flow may cause the magnetically saturated situations of CT during main transformer external area error, at this time
CT cannot correct faults side electric current, poor stream can not normal equilibrium, it is most likely that causes differential protection misoperation.Therefore institute
There is the differential relay protector that protective device often uses ratiometric dynamic formula, acting characteristic is：Action current is with imbalance
The increase of electric current and by ratio increase, basic ideas for introduce external short-circuit electric current as stalling current, be using difference current
Make electric current；When external area error electric current increases, stalling current also increases therewith, differential protection during so as to contain main transformer external area error
Malfunction happens.
The content of the invention
Tractive transformer biased differential protection system principle is complicated, logical relation is various, calculation amount in order to solve by the present invention
Greatly, the big problem of debugging difficulty carries out integrated treatment to test data by using EXCEL office softwares, completely examines system
Function.
The present invention adopts the following technical scheme that realization：A kind of side of tractive transformer biased differential protection field adjustable
Method includes the following steps：
A, according to the technical parameter of tractive transformer differential protection, the class of the tractive transformer to be debugged of confirmation
Type draws the current balance type relational expression of tractive transformer both sides according to tractive transformer type；
B, difference current I is drawn according to current balance type relational expressioncdWith stalling current IzdCalculation formula；
C, according to tractive transformer adjust be worth to difference current setting valve ICD, one section of ratio brake current value IZD1,
Two sections of ratio brake current value IZD2, one section of ratio brake coefficient K1, two sections of ratio brake coefficient K2, and according to more than parameter with
Difference current draws percentage differential performance diagram as ordinate, stalling current as abscissa；
D, the difference current I according to corresponding to percentage differential performance diagram can obtain each point on every section of line in figurecdWith
Stalling current IzdAction relationships formula；
E, by the current balance type relational expression of tractive transformer and difference current Icd, stalling current IzdCalculation formula can be with
Draw the high voltage side current of the relay protection tester input in debuggingWith low-pressure side electric currentCalculation formula；
F, inputted in EXCEL office softwaresWithCalculation formula, in percentage differential performance diagram appoint take one
Point, by its corresponding difference current IcdWith stalling current IzdValue be input in EXCEL, then it is automatic to calculate generation electric currentWith
G, using relay protection tester by electric currentWithIt inputs in differential protection, if the point taken is in percentage differential characteristic
(it is included in the point on curve) in braking area in graph, then differential protection is failure to actuate；If the point taken is in active region
(point more than curve), then differential protection action.
It was verified that since scene protection commissioning staff is to Differential Protection Principles of Transformer and protective device compensation principle
Understand that, there are deviation, the verification of percentage differential curve often becomes debugging difficult point.Especially in railway traction power supply system, lead
It is the key that entire tractive power supply system normal operation to draw transformer.In addition, (high pressure three-phase is lower the particularity of tractive transformer
Pressure two-phase) it is that common power transformer is debugged the difficulty in stage and can not be compared at the scene.
This method is verified mainly for tractive transformer percentage differential curve, make use of EXCEL office softwares to examination
Test data carry out integrated treatment, after the basic fundamental parameter of transformer type and differential protection is confirmed, can in advance by
Each formula is calculated and inputted in EXCEL office softwares, so that greatly reducing in the operand that Commissioning field carries out, is carried
High efficiency.It and eliminates and generates error because field adjustable personnel carry out a large amount of computings so as to differential protection
The judgement of protection feature has an impact.
Methodological science of the present invention is effective, technologically advanced, has higher use value, improves work efficiency,
A large amount of human and material resources costs have been saved, ensure that duration and quality.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the percentage differential performance diagram drawn exemplified by three-phase V/V (V/X) of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical scheme will be carried out below
Detailed description.Obviously, described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all on the premise of creative work is not made
Other embodiment belongs to the scope that the present invention is protected.
Technical scheme is described in detail below in conjunction with the accompanying drawings.
The present invention is by taking three-phase V/V (V/X) as an example, to a kind of tractive transformer biased differential protection provided by the present invention
Field adjustable method is explained in detail：
Using following steps：A, according to the technical parameter of tractive transformer differential protection, tractive transformer is confirmed
Type draws the current balance type relational expression of tractive transformer both sides according to tractive transformer typeWhereinRespectively tractive transformer high-pressure side three-phase current,Respectively tractive transformer low-pressure side two-phase current, nT1For tractive transformer high-pressure side CT no-load voltage ratios, nT2Become for traction
Depressor low-pressure side CT no-load voltage ratios, K are tractive transformer high and low pressure side umber of turn ratio, andW1For tractive transformer high pressure
Side umber of turn, W2For tractive transformer low-pressure side umber of turn；
B, difference current is drawn according to current balance type relational expressionAnd stalling currentWherein each symbolic indication is identical with step a, and whereinIt can be usedOrIt represents,It can
UsingIt represents, the relation between them to replace each other；
C, according to tractive transformer adjust be worth to difference current setting valve ICD, one section of ratio brake current value IZD1,
Two sections of ratio brake current value IZD2, one section of ratio brake coefficient K1, two sections of ratio brake coefficient K2, and according to more than parameter with
Difference current draws percentage differential performance diagram (as shown in Figure 1) as ordinate, stalling current as abscissa；
D, the difference current I according to corresponding to percentage differential performance diagram can obtain each point on every section of oblique line in figurecd
With stalling current IzdAction relationships formula：1) I is worked aszd<IZD1 and Icd>ICD, then differential protection startup.2) as IZD1≤Izd
During≤IZD2, it is I that the point on this section of oblique line can be obtained according to slope equationcd=K1(Izd- IZD1)+ICD, it accordingly can proper differential electricity
When flow valuve is more than this value, differential protection starts.3) IZD2 is worked as<IzdWhen, the point on this section of oblique line can be obtained according to slope equation
For Icd=K1(IZD2-IZD1)+ICD+K2(Izd- IZD2), accordingly can proper difference current be more than this value when, differential protection
Start；Other situations (point below curve, including the point being located on curve), differential protection is failure to actuate；
E, by the current balance type relational expression of tractive transformer and difference current Icd, stalling current IzdCalculation formula can be with
Draw the high voltage side current of the relay protection tester input in debuggingWith low-pressure side electric currentCalculation formula
F, in EXCEL office softwares, inputWithCalculation formula, in percentage differential performance diagram appoint take one
Point (Izd,Icd), Izd、IcdFor known parameters, by difference current IcdWith stalling current IzdValue be input in EXCEL, then automatically
Calculate generation electric currentWith
G, using relay protection tester by electric currentWithInput is into differential protection, if the point (I takenzd,Icd) than
(it is included in the point on curve) in braking area in the differential performance diagram of rate, then differential protection is failure to actuate；If the point taken
(Izd,Icd) in active region, then differential protection correctly acts, and thus can determine whether the protection feature of differential protection and is
It is no up to standard.
The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in change or replacement, should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (1)
- A kind of 1. method of tractive transformer biased differential protection field adjustable, which is characterized in that include the following steps：A, according to the technical parameter of tractive transformer differential protection, the type of the tractive transformer to be debugged of confirmation, root The current balance type relational expression of tractive transformer both sides is drawn according to tractive transformer type；B, difference current I is drawn according to current balance type relational expressioncdWith stalling current IzdCalculation formula；C, according to tractive transformer adjust be worth to difference current setting valve ICD, one section of ratio brake current value IZD1, two sections Ratio brake current value IZD2, one section of ratio brake coefficient K1, two sections of ratio brake coefficient K2, and according to more than parameter with differential Electric current draws percentage differential performance diagram as ordinate, stalling current as abscissa；D, the difference current I according to corresponding to percentage differential performance diagram can obtain each point on every section of line in figurecdAnd braking Electric current IzdAction relationships formula；E, by the current balance type relational expression of tractive transformer and difference current Icd, stalling current IzdCalculation formula can draw The high voltage side current that relay protection tester inputs during debuggingWith low-pressure side electric currentCalculation formula；F, inputted in EXCEL office softwaresWithCalculation formula, in percentage differential performance diagram appoint take a bit, will Its corresponding difference current IcdWith stalling current IzdValue be input in EXCEL, then it is automatic to calculate generation electric currentWithG, using relay protection tester by electric currentWithIt inputs in differential protection, if the point taken is in percentage differential characteristic curve In braking area in figure, then differential protection is failure to actuate；If the point taken is in active region, differential protection action.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711430256.6A CN108108343A (en) | 2017-12-26 | 2017-12-26 | A kind of field adjustable method of tractive transformer biased differential protection |
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| CN201711430256.6A CN108108343A (en) | 2017-12-26 | 2017-12-26 | A kind of field adjustable method of tractive transformer biased differential protection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110703152A (en) * | 2019-10-23 | 2020-01-17 | 盖国权 | Method for testing braking characteristic of differential protection ratio of transformer |
| CN113449486A (en) * | 2021-05-15 | 2021-09-28 | 山东英信计算机技术有限公司 | Method, device and equipment for evaluating PCB high-speed connector pad parameters and readable medium |
| CN113740649A (en) * | 2021-09-03 | 2021-12-03 | 大唐滨州发电有限公司 | Method for verifying differential protection ratio braking coefficient K value of transformer protection device |
| CN114264901A (en) * | 2021-12-07 | 2022-04-01 | 广东电网有限责任公司 | Balance current simulation method and related device during transformer out-of-area fault |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110703152A (en) * | 2019-10-23 | 2020-01-17 | 盖国权 | Method for testing braking characteristic of differential protection ratio of transformer |
| CN113449486A (en) * | 2021-05-15 | 2021-09-28 | 山东英信计算机技术有限公司 | Method, device and equipment for evaluating PCB high-speed connector pad parameters and readable medium |
| CN113740649A (en) * | 2021-09-03 | 2021-12-03 | 大唐滨州发电有限公司 | Method for verifying differential protection ratio braking coefficient K value of transformer protection device |
| CN114264901A (en) * | 2021-12-07 | 2022-04-01 | 广东电网有限责任公司 | Balance current simulation method and related device during transformer out-of-area fault |
| CN114264901B (en) * | 2021-12-07 | 2023-08-22 | 广东电网有限责任公司 | Balanced current simulation method and related device for transformer out-of-zone faults |
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Application publication date: 20180601 |