CN110261714A - A kind of short trouble rapid detection method applied to current limiter - Google Patents
A kind of short trouble rapid detection method applied to current limiter Download PDFInfo
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- CN110261714A CN110261714A CN201910519662.2A CN201910519662A CN110261714A CN 110261714 A CN110261714 A CN 110261714A CN 201910519662 A CN201910519662 A CN 201910519662A CN 110261714 A CN110261714 A CN 110261714A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention proposes a kind of short trouble rapid detection methods applied to current limiter.The transmission line of electricity three-phase current quadratic sum of present invention calculating current limiter side;Calculate fault detection amount;It is compared according to failure determination threshold value with fault detection amount, if fault detection amount is greater than failure determination threshold value, is judged as short trouble, output short-circuit fault-signal;If fault detection amount is not more than failure determination threshold value, fault-signal is not exported.The present invention can rapidly and accurately reflect short-circuit fault of power system transient signal variation characteristic, fast and reliable identification short trouble, and then cut-off route for breaker fast and stable and provide more efficient guarantee.
Description
Technical field
The present invention relates to Power System Faults Detection technical fields, and in particular to a kind of short trouble applied to current limiter
Rapid detection method.
Background technique
Grow as electric system continues to develop, power system capacity scale and voltage class are continuously improved, especially in high-voltage electricity
In net, short circuit current is exceeded to have become threat system stable operation, influences the major issue of power quality.At present frequently with access
The measure of fault current limiter solves short circuit current excessive problem.After short trouble occurs, in order to quickly limit short-circuit electricity
Stream inhibits the exceeded bring harm of short circuit current, it is desirable that put into fault current limiter in a very short period of time, therefore study quickly accurate
Short circuit failure detection method be the fast and reliable necessary condition to put into operation of fault current limiter.
Fault detection technique is particularly significant for current limiter operational effect, due to the particularity of current limiter, is applied to current limliting
The short circuit failure detection method rapidity requirement of device is higher, needs quickly to identify failure in short trouble generation moment, makes current limliting
Device puts into operation.Existing fault detection method requires greatly 3 milliseconds and its above time, and in certain non-faulting operating conditions
Such as excitation surge current, reactive compensation etc., system protection can issue erroneous judgement signal.It is most of to examine although there are many fault detection method
Survey method can not quickly, it is reliable, accurately identify short circuit fault signal, become urgent problem to be solved in the prior art.
Summary of the invention
The purpose of the present invention is to provide a kind of short trouble rapid detection methods applied to current limiter, surpass for solving
Impact of the short circuit current to electric system and equipment when high voltage network short-circuit fault, within the allowable range by short circuit current limitation,
The technological difficulties in grid network and annulation process are solved, power system transient stability is improved, is that high-voltage fence current limiter is fast
The key that speed reliably puts into operation.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of short trouble rapid detection method applied to current limiter, comprising the following steps:
Step 1: calculating the transmission line of electricity three-phase current quadratic sum of current limiter side;
Step 2: calculating fault detection amount;
Step 3: failure determination threshold value is compared with fault detection amount, if fault detection amount is greater than failure determination threshold value,
Then it is judged as short trouble, output short-circuit fault-signal;If fault detection amount is not more than failure determination threshold value, failure is not exported
Signal.
Preferably, it is as follows to calculate three-phase current signal quadratic sum in step 1:
When system operates normally:
Wherein:
ImA=ImB=ImC=Im
It can obtain:
When short trouble occurs:
If single-phase earthing fault occurs:
If two-phase short-circuit fault occurs:
If three phase short circuit fault occurs:
Wherein, i (t) is short-circuit current, and SSC is three-phase current quadratic sum, iAFor A phase current, iBFor B phase current, iC
For C phase current, ImFor steady-state current amplitude, Im' it is AC compounent amplitude, I0For attenuating dc component amplitude, θ is phase angle,For
Failure initial phase, τ are DC component damping time constant;
Preferably, calculating fault detection amount FDC (t described in step 2n) are as follows:
Signal is handled by the way of shifting data window, taking data window length is Ts=10ms, current time tn, every number
It is Δ t=t according to window movable lengthn-tn-1=1ms, SC (tn) it is current time intermediate quantity, SC (tn-1) it is tn-1Moment intermediate quantity,
FDC(tn) it is current time fault detection amount.
Preferably, be compared by failure determination threshold value with fault detection amount described in step 3, specifically:
It is as follows that short trouble detects logic judgment condition:
FDC(tn) > TH
Wherein, FDC (tn) indicate tnMoment fault detection amount, TH representing fault detection threshold value, FDC (t when short troublen)
Can rapid increase, when fault detection amount be greater than failure determination threshold value, then be judged as short trouble, to current limiter output short-circuit failure
Signal, the movement of current limiter ontology high-speed switch, current limiter puts into operation, when fault detection amount is not more than failure determination threshold value, then
Short trouble does not occur for judgement, does not export fault-signal.
Beneficial effects of the present invention:
A kind of short trouble rapid detection method applied to current limiter of the present invention utilizes back-and-forth motion data window
The ratio between three-phase current quadratic sum mean value is used as fault detection amount, can rapidly and accurately reflect that high voltage network short-circuit fault transient state is believed
Number variation characteristic, fast and reliable identification short trouble, and then more efficient guarantee is provided for current limiter fast and stable investment.
Detailed description of the invention
It, below will be to tool for the more detailed description specific embodiment of the invention or current short trouble detection technique scheme
Attached drawing needed for body embodiment or current short trouble detection technique scheme explanation is briefly introduced.The following drawings is only shown
Certain embodiments of the present invention is gone out, therefore has been not construed as the restriction to range, those of ordinary skill in the art have been come
It says, without creative efforts, other various forms of modifications or variation can also be carried out according to these attached drawings.
Fig. 1: for short circuit failure detection method flow chart of the invention;
Fig. 2: short circuit failure detection method testing result.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
A kind of short trouble applied to current limiter of the present invention will quickly be detected with specific embodiment below
Method is further detailed:
For the present invention on matlab platform, to have built IEEE-9 node system model, which includes IEEE-9 node,
3 generators, 3 transformers, 6 routes, 3 loads, route use Bei Jielong model, frequency 50Hz, voltage rating
220kV, relevant parameter such as table 1, fault point occur among route 2, after considering that four kinds of short trouble operating conditions, failure occur.
As shown in Figure 1, a kind of short trouble rapid detection method applied to current limiter of the present invention, including it is following
Step:
Step 1: calculating the transmission line of electricity three-phase current quadratic sum of current limiter side;
It is as follows that three-phase current signal quadratic sum is calculated in step 1:
When system operates normally:
Wherein:
ImA=ImB=ImC=Im
It can obtain:
When short trouble occurs:
If single-phase earthing fault occurs:
If two-phase short-circuit fault occurs:
If three phase short circuit fault occurs:
Wherein, i (t) is short-circuit current, and SSC is three-phase current quadratic sum, iAFor A phase current, iBFor B phase current, iC
For C phase current, ImFor steady-state current amplitude, Im' it is AC compounent amplitude, I0For attenuating dc component amplitude, θ is phase angle,
For failure initial phase, τ is DC component damping time constant.
Step 2: calculating fault detection amount;
Fault detection amount FDC (t is calculated described in step 2n) are as follows:
Signal is handled by the way of shifting data window, taking data window length is Ts=10ms, current time tn, every number
It is Δ t=t according to window movable lengthn-tn-1=1ms, SC (tn) it is current time intermediate quantity, SC (tn-1) it is tn-1Moment intermediate quantity,
FDC(tn) it is current time fault detection amount.
Step 3: failure determination threshold value is compared with fault detection amount, if fault detection amount is greater than failure determination threshold value,
Then it is judged as short trouble, output short-circuit fault-signal;If fault detection amount is not more than failure determination threshold value, failure is not exported
Signal.
It is compared by failure determination threshold value with fault detection amount described in step 3, specifically:
It is as follows that short trouble detects logic judgment condition:
FDC(tn) > TH
Wherein, FDC (tn) indicate tnMoment fault detection amount, TH representing fault detection threshold value, FDC (t when short troublen)
Can rapid increase, when fault detection amount be greater than failure determination threshold value, then be judged as short trouble, to current limiter output short-circuit failure
Signal, the movement of current limiter ontology high-speed switch, current limiter puts into operation, when fault detection amount is not more than failure determination threshold value, then
Short trouble does not occur for judgement, does not export fault-signal.
After considering that four kinds of short trouble operating conditions, failure occur, short circuit failure detection method testing result is as shown in Figure 2.Fig. 2
The result shows that a kind of short trouble rapid detection method applied to current limiter proposed by the present invention can quick and precisely detect it is short
Road failure provides a strong guarantee for fast and reliable put into operation of current limiter.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations.Although referring to aforementioned each implementation
Invention is explained in detail for example, those skilled in the art still can according to previous embodiment or attached drawing into
Other various forms of modifications of row or variation.Here can not all embodiments or technical solution be carried out with exhaustion, all hairs
Modification, replacement in bright principle etc., should be included in the present invention claims protection scope in.
Claims (4)
1. a kind of short trouble rapid detection method applied to current limiter, which comprises the following steps:
Step 1: calculating the transmission line of electricity three-phase current quadratic sum of current limiter side;
Step 2: calculating fault detection amount;
Step 3: failure determination threshold value is compared with fault detection amount, if fault detection amount is greater than failure determination threshold value, is sentenced
Break as short trouble, output short-circuit fault-signal;If fault detection amount is not more than failure determination threshold value, failure letter is not exported
Number.
2. the short trouble rapid detection method according to claim 1 applied to current limiter, it is characterised in that: step 1
Middle calculating three-phase current signal quadratic sum is as follows:
When system operates normally:
Wherein:
ImA=ImB=ImC=Im
It can obtain:
When short trouble occurs:
If single-phase earthing fault occurs:
If two-phase short-circuit fault occurs:
If three phase short circuit fault occurs:
Wherein, i (t) is short-circuit current, and SSC is three-phase current quadratic sum, iAFor A phase current, iBFor B phase current, iCFor C
Phase current, ImFor steady-state current amplitude, Im' it is AC compounent amplitude, I0For attenuating dc component amplitude, θ is phase angle,For event
Hinder initial phase, τ is DC component damping time constant.
3. the short trouble rapid detection method according to claim 1 applied to current limiter, it is characterised in that: step 2
The calculating fault detection amount FDC (tn) are as follows:
Signal is handled by the way of shifting data window, taking data window length is Ts=10ms, current time tn, each data window
Movable length is Δ t=tn-tn-1=1ms, SC (tn) it is current time intermediate quantity, SC (tn-1) it is tn-1Moment intermediate quantity, FDC
(tn) it is current time fault detection amount.
4. the short trouble rapid detection method according to claim 1 applied to current limiter, it is characterised in that: step 3
Described in be compared by failure determination threshold value with fault detection amount, specifically:
It is as follows that short trouble detects logic judgment condition:
FDC(tn) > TH
Wherein, FDC (tn) indicate tnMoment fault detection amount, TH representing fault detection threshold value, FDC (t when short troublen) can be fast
Speed rise, when fault detection amount be greater than failure determination threshold value, then be judged as short trouble, to current limiter output short-circuit failure believe
Number, the movement of current limiter ontology high-speed switch, current limiter puts into operation, when fault detection amount is not more than failure determination threshold value, then sentences
It is disconnected that short trouble does not occur, do not export fault-signal.
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Cited By (6)
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CN110687477A (en) * | 2019-10-17 | 2020-01-14 | 武汉大学 | Rapid short-circuit fault detection system and method applied to high-voltage substation |
CN112147536A (en) * | 2020-09-07 | 2020-12-29 | 广东电网有限责任公司广州供电局 | Current-amount-based short-circuit fault rapid detection method |
CN112345883A (en) * | 2020-10-23 | 2021-02-09 | 刘振盛 | Transmission line hidden danger early warning system based on traveling wave current |
CN113109671A (en) * | 2021-04-30 | 2021-07-13 | 武汉大学 | Method for accelerating detection of small half-wave stage of fault current |
CN113253048A (en) * | 2021-04-27 | 2021-08-13 | 南京南瑞继保电气有限公司 | Short-circuit fault detection method and device |
CN115588972A (en) * | 2022-12-08 | 2023-01-10 | 中国南方电网有限责任公司超高压输电公司广州局 | Short circuit current limiting control system |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110687477A (en) * | 2019-10-17 | 2020-01-14 | 武汉大学 | Rapid short-circuit fault detection system and method applied to high-voltage substation |
CN112147536A (en) * | 2020-09-07 | 2020-12-29 | 广东电网有限责任公司广州供电局 | Current-amount-based short-circuit fault rapid detection method |
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CN113109671A (en) * | 2021-04-30 | 2021-07-13 | 武汉大学 | Method for accelerating detection of small half-wave stage of fault current |
CN113109671B (en) * | 2021-04-30 | 2022-07-19 | 武汉大学 | Method for accelerating detection of small half-wave stage of fault current |
CN115588972A (en) * | 2022-12-08 | 2023-01-10 | 中国南方电网有限责任公司超高压输电公司广州局 | Short circuit current limiting control system |
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