CN106786430A - A kind of discriminating conduct of short circuit malfunction - Google Patents
A kind of discriminating conduct of short circuit malfunction Download PDFInfo
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- CN106786430A CN106786430A CN201710045334.4A CN201710045334A CN106786430A CN 106786430 A CN106786430 A CN 106786430A CN 201710045334 A CN201710045334 A CN 201710045334A CN 106786430 A CN106786430 A CN 106786430A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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Abstract
Electric and electronic technical field of the present invention, more particularly to a kind of discriminating conduct of short circuit malfunction, including：Step S1, the alternating current on one power network of collection, and alternating current is converted into data signal and is filtered；Step S2, filtered data signal is input into discrimination system, when the trigger condition of any one during filtered data signal meets each current-rising-rate discrimination module and current amplitude discrimination module, a pulse signal is exported from total delivery outlet；Step S3, persistently detects total delivery outlet, is judged to that short trouble occurs in power network when total delivery outlet output pulse signal is detected；Short circuit malfunction can be picked out in hundreds of microseconds, be swift in response, and current amplitude protection and current step change protection are combined, the short-circuit conditions of near-end load and distal end load can be distinguished on power network.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly to a kind of discriminating conduct of short circuit malfunction.
Background technology
As socio-economic development, net capacity increase, interconnectivity is strengthened between regional power grid, and short trouble is pacified to power network
Entirely, stably, economical operation bring destructiveness strengthen therewith.At present, short trouble protection is general uses fuse or open circuit
Device.They are that by the fuel factor of short circuit current, or the virtual value of short circuit current exceedes given threshold, or short circuit current
Instantaneous value distinguishes short trouble more than given threshold.These short trouble discriminating conducts, detection time is long, typically several
Ten milliseconds, or even hundreds of milliseconds, more than ten milliseconds are needed at the soonest.So as to there is larger short circuit current to flow through in power network, its generation
Electric power and fuel factor very big threat is caused to electrical equipment in system.Additionally, can not in time by the failure that is short-circuited
Grid cut off from whole system, cascading failure that can be between initiation area even results in mains breakdown in big region, makes
Into large-area power-cuts, seriously economic loss is brought.Wherein, most common in power system during short trouble, harmfulness is maximum
One of failure.
The content of the invention
Regarding to the issue above, the present invention proposes a kind of discriminating conduct of electric network fault, is applied to distinguishing for an electric network fault
Other system, the short circuit malfunction discrimination system includes at least one current-rising-rate discrimination module and current amplitude in parallel
Discrimination module, each described current-rising-rate discrimination module has the trigger condition of a different current-rising-rate respectively, described
Current amplitude discrimination module has the trigger condition of a current amplitude, the current-rising-rate discrimination module or the current amplitude
Discrimination module exports a pulse signal when trigger condition is met from delivery outlet, and each described current-rising-rate is distinguished
The delivery outlet of module and the current amplitude discrimination module merges to form a total delivery outlet；Including：
Step S1, the alternating current on one power network of collection, is converted into the alternating current data signal and filters；
Step S2, the filtered data signal is input into the discrimination system, in the filtered numeral
Signal meets the trigger condition of any one in each current-rising-rate discrimination module and the current amplitude discrimination module
When, export the pulse signal from total delivery outlet；
Step S3, persistently detects total delivery outlet, sentences in detecting when total delivery outlet exports the pulse signal
It is set to the power network and short trouble occurs.
Above-mentioned discriminating conduct, wherein, the current-rising-rate discrimination module includes one first pre-set current value, one second
Pre-set current value, one first Preset Time and one second Preset Time, second pre-set current value are preset more than described first
Current value, second Preset Time is more than first Preset Time, and in the step S2, the current-rising-rate distinguishes mould
The discriminating conduct of block includes：
Step S2A1, persistently judges whether the instantaneous current value that the data signal is represented is more than first predetermined current
Value；
It is then to start timing and turn to step S2A2；
It is no, then continue to be waited in the step S2A1；
Step S2A2, persistently judges the instantaneous current value that the data signal represents in second Preset Time
Whether reach more than second pre-set current value；
It is then to stop timing and turn to step S2A3；
It is no, if timing time exceeds second Preset Time, timing is zeroed and step S2A4 is turned to,
If without departing from second Preset Time, continuing timing；
Whether step S2A3, judge the timing time after stopping more than first Preset Time；
It is then to export the pulse signal, and timing is zeroed and the step S2A1 is returned；
It is no, then turn to step S2A4；
Step S2A4, persistently judges whether the instantaneous current value that the data signal is represented is preset less than described first
Current value；
It is then to return to the step S2A1；
It is no, then continue to be waited in the step S2A4.
Above-mentioned discriminating conduct, wherein, discriminating conduct according to claim 1, it is characterised in that the electric current width
Value discrimination module includes one the 3rd pre-set current value and one the 3rd Preset Time, and in the step S2, the current amplitude is distinguished
The discriminating conduct of module includes：
Step S2B1, persistently judges whether the instantaneous current value that the data signal is represented is more than the 3rd predetermined current
Value；
It is then to start timing and turn to step S2B2；
It is no, then continue to be waited in the step S2B1；
Step S2B2, persistently judges the instantaneous current value that the data signal represents in the 3rd Preset Time
Whether threeth pre-set current value is less than；
It is no, if timing time exceeds the 3rd Preset Time, the pulse signal is exported, and by timing zero simultaneously
The step S2B1 is returned,
If without departing from the 3rd Preset Time, continuing timing；
It is then to return to the step S2B1.
Above-mentioned discriminating conduct, wherein, the duration ranges of the pulse signal are between 8ms~12ms.
Above-mentioned discriminating conduct, wherein, the duration of the pulse signal is 10ms.
Above-mentioned discriminating conduct, wherein, in the step S3, detect total delivery outlet and export the pulse signal
It is judged to that short trouble occurs in the power network during rising edge.
Above-mentioned discriminating conduct, wherein, the alternating current on the power network is gathered with a predeterminated frequency.
Above-mentioned discriminating conduct, wherein, in the step S1, using having limit for length's unit impulse response wave filter to the number
Word pulse is filtered.
Above-mentioned discriminating conduct, wherein, in the step S1, there is limit for length's unit impulse response wave filter to institute using 32 ranks
Digit pulse is stated to be filtered.
Beneficial effect：A kind of discriminating conduct of short circuit malfunction proposed by the present invention can be picked out in hundreds of microseconds
Short circuit malfunction, is swift in response, and current amplitude protection and current step change protection are combined, near-end load on power network
The short-circuit conditions loaded with distal end can be distinguished.
Brief description of the drawings
Fig. 1 is the discriminating conduct flow chart of steps of short circuit malfunction in one embodiment of the invention；
The step of Fig. 2 is the discriminating conduct of current-rising-rate discrimination module in one embodiment of the invention flow chart；
Fig. 3 is the principle legend of short circuit malfunction discriminating conduct in one embodiment of the invention.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples.
In a preferred embodiment, as shown in Figure 1, it is proposed that a kind of discriminating conduct of electric network fault, it is applied to one
The discrimination system of electric network fault, short circuit malfunction discrimination system include in parallel at least one current-rising-rate discrimination module and
Current amplitude discrimination module, each current-rising-rate discrimination module has the trigger condition of a different current-rising-rate respectively,
Current amplitude discrimination module has the trigger condition of a current amplitude, current-rising-rate discrimination module or current amplitude discrimination module
A pulse signal is exported from delivery outlet when trigger condition is met, and each current-rising-rate discrimination module and current amplitude are distinguished
The delivery outlet of other module merges to form a total delivery outlet；Including：
Step S1, the alternating current on one power network of collection, is converted into alternating current data signal and filters；
Step S2, filtered data signal is input into discrimination system, and each is met in filtered data signal
In current-rising-rate discrimination module and current amplitude discrimination module during the trigger condition of any one, pulse is exported from total delivery outlet
Signal；
Step S3, persistently detects total delivery outlet, is judged to that power network occurs when total delivery outlet output pulse signal is detected
Short trouble.
Specifically, the discrimination system can be by CPLD (Complex Programmable Logic Device, complexity
PLD) or FPGA (Field-Programmable Gate Array, i.e. field programmable gate array) formation
's.
In a preferred embodiment, as shown in Fig. 2 current-rising-rate discrimination module includes one first predetermined current
Value, one second pre-set current value, one first Preset Time and one second Preset Time, the second pre-set current value are preset more than first
Current value, the second Preset Time is more than the first Preset Time, in step S2, the discriminating conduct bag of current-rising-rate discrimination module
Include：
Step S2A1, persistently judges whether the instantaneous current value that data signal is represented is more than the first pre-set current value；
It is then to start timing and turn to step S2A2；
It is no, then continue to be waited in step S2A1；
Step S2A2, persistently judges whether instantaneous current value that data signal is represented reaches in the second Preset Time and is more than
Second pre-set current value；
It is then to stop timing and turn to step S2A3；
It is no, if timing time exceeds the second Preset Time, timing is zeroed and step S2A4 is turned to；
If without departing from the second Preset Time, continuing timing；
Whether step S2A3, judge the timing time after stopping more than the first Preset Time；
It is, then output pulse signal, and timing is zeroed and return to step S2A1；
It is no, then turn to step S2A4；
Step S2A4, persistently judges whether the instantaneous current value that data signal is represented is less than the first pre-set current value；
It is, then return to step S2A1；
It is no, then continue to be waited in step S2A4.
Wherein, the discriminating conduct of different current-rising-rate discrimination modules can be identical, but default parameter should
It is different with for different short-circuit conditions；Due to the presence of current spikes in power network, it is possible that current-rising-rate is prominent
Right elevated situation, but such case is not the real situation for short circuit occur, it is therefore desirable to one first Preset Time is set,
When the time that transient current rises to the second pre-set current value from the first pre-set current value is less than the first Preset Time, ignore this
Electric current rises；Second Preset Time is used to weigh whether the climbing reaches the requirement for being judged to short trouble；First default electricity
Flow valuve is used to, as the standard for starting timing, timing is started during more than the first pre-set current value；Second pre-set current value is used to weigh
Whether amount climbing reaches the requirement for being judged to short trouble.
In a preferred embodiment, discriminating conduct according to claim 1, it is characterised in that current amplitude is distinguished
Module includes one the 3rd pre-set current value and one the 3rd Preset Time, in step S2, the discriminating conduct of current amplitude discrimination module
Including：
Step S2B1, persistently judges whether the instantaneous current value that data signal is represented is more than the 3rd pre-set current value；
It is then to start timing and turn to step S2B2；
It is no, then continue to be waited in step S2B1；
Step S2B2, persistently judges whether the instantaneous current value that data signal is represented is less than in the 3rd Preset Time
3rd pre-set current value；
It is no, if timing time exceeds the 3rd Preset Time, output pulse signal, and timing is zeroed and step is returned
S2B1,
If without departing from the 3rd Preset Time, continuing timing；
It is, then return to step S2B1.
Wherein, whether the situation that the 3rd Preset Time is higher by the 3rd pre-set current value for weighing transient current is electric current hair
Thorn.
In a preferred embodiment, the duration ranges of pulse signal are between 8ms~12ms.
In above-described embodiment, it is preferable that the duration of pulse signal is 10ms.
In a preferred embodiment, in step S3, sentence during the rising edge for detecting total delivery outlet output pulse signal
It is set to power network and short trouble occurs.
In a preferred embodiment, in step S1, with the alternating current on predeterminated frequency collection power network.
In a preferred embodiment, in step S1, using having limit for length's unit impulse response wave filter to digit pulse
It is filtered.
In above-described embodiment, it is preferable that in step S1, there is limit for length's unit impulse response wave filter to digital arteries and veins using 32 ranks
Punching is filtered.
Specifically, can with as shown in figure 3, A/D sampling sections using 16 bit resolutions high-speed a/d sample, by outside mould
Intend signal and be converted to data signal, supply subsequent software algorithm is used.A/D Sampling Interfaces program, N are realized in FPGA or CPLD
Rank FIR filtering, current step change protection and current amplitude protection, executed in parallel between each module.FIR filtering is parallel using 32 ranks
FIR is filtered, and filters noise.Current step change protection modules A is mainly used in current instantaneous value in ISET1And its occur below near-end
During short trouble, current protection action；Current step change protection module B is mainly used in current instantaneous value in ISET1~ISET2Between
During generation near-end short trouble, current protection action；When current amplitude protection module is used for power network generation far end short failure, electricity
Stream protection act, rotection thresholds are ISET4。
Realize that step is as follows：
S01：The high-speed a/d sampling of frequency is fixed to secondary current signal, then using 32 rank FIR filters to adopting
Sample result carries out digital filtering, filters the interference signal of signal；
S02：Filtered data signal enters current step change protection modules A, current step change protection module B and electric current
Amplitude protection module, separate operation between each module.In current step change protection module and current amplitude protection module,
The judgement of current step change protection and current amplitude protection is carried out respectively.If certain protection module is acted, module output one
Individual width is the high pulse signal of 10ms；
S03：In output interface module is protected, each protection module output result is carried out or computing first, be merged into one
Road signal；Then, the signal rising edge is constantly detected.If detecting the signal rising edge, can be according to system requirements, to outside
I/O signals are correspondingly protected in output.
The parameter of current step change protection modules A and current step change protection module B is different, but climbing protection is sentenced
Constant current journey is identical.Parameter involved by current step change protection modules A：Current start value ISET1, current-termination value ISET2,
And ISET1<ISET2, minimum time is T1MIN, maximum time is T1MAX；Parameter involved by current step change protection module B：Electric current
Initiation value ISET2, current-termination value ISET3, and ISET2<ISET3, minimum time is T2MIN, maximum time is T2MAX.Risen with electric current
As a example by rate protection module A, realize that step is as follows：
ST01：Timer resets, and constantly compares current instantaneous value and given threshold ISET1Size.If current instantaneous value
More than given threshold ISET1, then into ST02 states；Otherwise, continue to be waited in ST01 states；
ST02：When starting timer, and constantly compare timing time and maximum time T1MAXSize and electric current wink
Duration and given threshold ISET2Size.If timing time is more than maximum time T1MAX, then into ST04 states；If electric current is instantaneous
Value is more than given threshold ISET2, then into ST03 states；Otherwise, continue to be waited in ST02 states；
ST03：It is T to compare timing time and minimum time1MIN.If timing time is T more than minimum time1MIN, then enter
ST05 states；Otherwise, into ST04 states；
ST04：Constantly compare current instantaneous value and given threshold ISET1Size.If current instantaneous value is less than given threshold
ISET1, then into ST01 states；Otherwise, continue to be waited in ST04 states；
ST05：After one width of output is for the high pulse signal of 10ms, ST01 states are returned.
Current amplitude protection module parameter is：Amplitude rotection thresholds ISET4, minimum delay time tmin, realize that step is as follows：
ST11：Timer resets, and constantly compares current instantaneous value and given threshold ISET4Size.If current instantaneous value
More than given threshold ISET4, then into ST12 states；Otherwise, continue to be waited in ST11 states；
ST12：When starting timer, and constantly compare timing time and minimum delay time tminSize and electric current
Instantaneous value and given threshold ISET4Size.If timing time is more than minimum delay time tmin, then into ST13 states；If electric
Stream instantaneous value is less than given threshold ISET4, then into ST11 states；Otherwise, continue to be waited in ST12 states；
ST13：After one width of output is for the high pulse signal of 10ms, ST11 states are returned.
It is assumed that the rated current of ac bus is In, threshold value ISET1May be configured asThreshold value ISET2May be configured asThreshold value ISET3May be configured asThreshold value ISET4May be configured asThe time T that the method is related to1MIN、
T1MAX、T2MIN、T2MAXCan be set according to short-circuit climbing, minimum delay time tminIt is traditionally arranged to be 20 μ s.
Moment size of current and short circuit current climbing are occurred according to short trouble, short trouble of the present invention is quick
Discriminating conduct is broadly divided into following three kinds of situations to short trouble identification：
Situation 1：
Before short trouble occurs, bus is in normal operating condition, and electric current is InAnd its it is following.Now, there is near-end short
Road failure, short circuit current climbing is higher, and current instantaneous value is from threshold value ISET1To threshold value ISET2Elapsed time meets the present invention and relates to
And current step change protection modules A operation condition, trigger the modules A action.
Situation 2：
Before short trouble occurs, bus is in overlond running state, and electric current is more than 1.5In.Now, it is big in current instantaneous value
In threshold value ISET1Subregion in occur near-end short trouble, short circuit current climbing electric current higher, involved in the present invention
Climbing protection module A will fail, and current instantaneous value is from threshold value ISET2To threshold value ISET3Elapsed time meets of the present invention
The operation condition of current step change protection module B, triggers module B actions.
Situation 3：
When there is far end short failure, short circuit current climbing is relatively low, current step change protection involved in the present invention
Modules A and current step change protection module B fail.But current instantaneous value is more than threshold value ISET4Remain able to more than minimum time delay
Time tmin, now, the operation condition of current amplitude of the present invention is disclosure satisfy that, trigger amplitude protection act.
In sum, the discriminating conduct of a kind of short circuit malfunction proposed by the present invention can be picked out in hundreds of microseconds
Short circuit malfunction, is swift in response, and current amplitude protection and current step change protection are combined, near-end load on power network
The short-circuit conditions loaded with distal end can be distinguished.
By explanation and accompanying drawing, the exemplary embodiments of the ad hoc structure of specific embodiment are given, based on essence of the invention
God, can also make other conversions.Although foregoing invention proposes existing preferred embodiment, however, these contents are not intended as
Limitation.
For a person skilled in the art, after reading described above, various changes and modifications undoubtedly will be evident that.
Therefore, appending claims should regard the whole variations and modifications for covering true intention of the invention and scope as.In power
Any and all scope and content of equal value, are all considered as still belonging to the intent and scope of the invention in the range of sharp claim.
Claims (9)
1. a kind of discriminating conduct of electric network fault, is applied to the discrimination system of an electric network fault, it is characterised in that the power network is short
Failure discrimination system in road includes at least one current-rising-rate discrimination module and current amplitude discrimination module in parallel, described in each
Current-rising-rate discrimination module has the trigger condition of a different current-rising-rate, the current amplitude discrimination module tool respectively
There is the trigger condition of a current amplitude, the current-rising-rate discrimination module or the current amplitude discrimination module are described in meeting
During trigger condition a pulse signal, and each current-rising-rate discrimination module and the current amplitude are exported from delivery outlet
The delivery outlet of discrimination module merges to form a total delivery outlet；Including：
Step S1, the alternating current on one power network of collection, is converted into the alternating current data signal and filters；
Step S2, the filtered data signal is input into the discrimination system, in the filtered data signal
When meeting the trigger condition of any one in each current-rising-rate discrimination module and the current amplitude discrimination module, from
Total delivery outlet exports the pulse signal；
Step S3, persistently detects total delivery outlet, is judged in detecting when total delivery outlet exports the pulse signal
There is short trouble in the power network.
2. discriminating conduct according to claim 1, it is characterised in that the current-rising-rate discrimination module includes one first
Pre-set current value, one second pre-set current value, one first Preset Time and one second Preset Time, second pre-set current value
More than first pre-set current value, second Preset Time is more than first Preset Time, described in the step S2
The discriminating conduct of current-rising-rate discrimination module includes：
Step S2A1, persistently judges whether the instantaneous current value that the data signal is represented is more than first pre-set current value；
It is then to start timing and turn to step S2A2；
It is no, then continue to be waited in the step S2A1；
Step S2A2, persistently judge the instantaneous current value that the data signal represents in second Preset Time whether
Reach more than second pre-set current value；
It is then to stop timing and turn to step S2A3；
It is no, if timing time exceeds second Preset Time, timing is zeroed and step S2A4 is turned to,
If without departing from second Preset Time, continuing timing；
Whether step S2A3, judge the timing time after stopping more than first Preset Time；
It is then to export the pulse signal, and timing is zeroed and the step S2A1 is returned；
It is no, then turn to step S2A4；
Step S2A4, persistently judges whether the instantaneous current value that the data signal is represented is less than first predetermined current
Value；
It is then to return to the step S2A1；
It is no, then continue to be waited in the step S2A4.
3. discriminating conduct according to claim 1, it is characterised in that discriminating conduct according to claim 1, it is special
Levy and be, the current amplitude discrimination module includes one the 3rd pre-set current value and one the 3rd Preset Time, in the step S2,
The discriminating conduct of the current amplitude discrimination module includes：
Step S2B1, persistently judges whether the instantaneous current value that the data signal is represented is more than the 3rd pre-set current value；
It is then to start timing and turn to step S2B2；
It is no, then continue to be waited in the step S2B1；
Step S2B2, persistently judge the instantaneous current value that the data signal represents in the 3rd Preset Time whether
It is less than the 3rd pre-set current value；
It is no, if timing time exceeds the 3rd Preset Time, export the pulse signal, and timing is zeroed and returned
The step S2B1,
If without departing from the 3rd Preset Time, continuing timing；
It is then to return to the step S2B1.
4. discriminating conduct according to claim 1, it is characterised in that the duration ranges of the pulse signal are in 8ms
Between~12ms.
5. discriminating conduct according to claim 4, it is characterised in that the duration of the pulse signal is 10ms.
6. discriminating conduct according to claim 1, it is characterised in that in the step S3, detects total delivery outlet
It is judged to that short trouble occurs in the power network during rising edge for exporting the pulse signal.
7. discriminating conduct according to claim 1, it is characterised in that described on the predeterminated frequency collection power network
Alternating current.
8. discriminating conduct according to claim 1, it is characterised in that in the step S1, using there is limit for length's unit impulse
Response filter is filtered to the digit pulse.
9. discriminating conduct according to claim 1, it is characterised in that in the step S1, have limit for length's unit using 32 ranks
Impact response filter is filtered to the digit pulse.
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| CN202305715U (en) * | 2011-08-13 | 2012-07-04 | 武汉长海电气科技开发有限公司 | Rapid failure identification device |
| CN102842890A (en) * | 2012-09-24 | 2012-12-26 | 国电南瑞科技股份有限公司 | Realizing method of current change rate protection |
| CN105870886A (en) * | 2016-03-29 | 2016-08-17 | 上海电气集团股份有限公司 | Short-circuit protection device of solid-state switch |
| CN106207949A (en) * | 2016-08-23 | 2016-12-07 | 温新正 | A kind of method protecting charging current limiter resistance |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485093A (en) * | 1993-10-15 | 1996-01-16 | The Texas A & M University System | Randomness fault detection system |
| CN202305715U (en) * | 2011-08-13 | 2012-07-04 | 武汉长海电气科技开发有限公司 | Rapid failure identification device |
| CN102435827A (en) * | 2011-09-15 | 2012-05-02 | 西安交通大学 | Rogowski coil-based method and Rogowski coil-based device for detecting direct-current short-circuit current fault |
| CN102842890A (en) * | 2012-09-24 | 2012-12-26 | 国电南瑞科技股份有限公司 | Realizing method of current change rate protection |
| CN105870886A (en) * | 2016-03-29 | 2016-08-17 | 上海电气集团股份有限公司 | Short-circuit protection device of solid-state switch |
| CN106207949A (en) * | 2016-08-23 | 2016-12-07 | 温新正 | A kind of method protecting charging current limiter resistance |
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| CN106786430B (en) | 2018-12-18 |
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