CN106786430B - 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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- CN106786430B CN106786430B CN201710045334.4A CN201710045334A CN106786430B CN 106786430 B CN106786430 B CN 106786430B CN 201710045334 A CN201710045334 A CN 201710045334A CN 106786430 B CN106786430 B CN 106786430B
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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
Abstract
Power electronics field of the present invention more particularly to a kind of discriminating conduct of short circuit malfunction, comprising: step S1 acquires the alternating current on a power grid, and alternating current is converted into digital signal and is filtered；Filtered digital signal is input in discrimination system by step S2, when filtered digital signal meets the trigger condition of any one in each current-rising-rate discrimination module and current amplitude discrimination module, exports a pulse signal from total delivery outlet；Step S3 persistently detects total delivery outlet, is determined as that short trouble occurs in power grid when detecting total delivery outlet output pulse signal；Short circuit malfunction can be picked out in several hundred microseconds, be swift in response, and current amplitude protection and current step change protection are combined, the short-circuit conditions of proximal end load and distal end load can distinguish on power grid.
Description
Technical field
The present invention relates to power electronics field more particularly to a kind of discriminating conducts of short circuit malfunction.
Background technique
With socio-economic development, electrical network capacity increases, and interconnectivity is reinforced between regional power grid, and short trouble pacifies power grid
Entirely, stablize, economical operation bring destructiveness enhances therewith.Currently, short trouble protection generally uses fuse or open circuit
Device.It is more than given threshold or short circuit current that they, which are by the virtual value of the fuel factor of short circuit current perhaps short circuit current,
Instantaneous value is more than given threshold to distinguish short trouble.These short trouble discriminating conducts, detection time is long, generally several
Ten milliseconds or even several hundred milliseconds, need more than ten milliseconds at the soonest.To there is biggish short circuit current to flow through in power grid, generate
Electric power and fuel factor very big threat is caused to electrical equipment in system.In addition, short trouble will cannot occur in time
Grid cut off from whole system, can cascading failure between initiation area, even result in mains breakdown in big region, make
At large-area power-cuts, seriously economic loss is brought.Wherein, when short trouble it is most common in electric system, harmfulness is maximum
One of failure.
Summary of the invention
In view of the above-mentioned problems, the invention proposes a kind of discriminating conduct of electric network fault, applied to distinguishing for an electric network fault
Other system, the short circuit malfunction discrimination system include at least one current-rising-rate discrimination module and current amplitude in parallel
Discrimination module, each current-rising-rate discrimination module is respectively provided with the trigger condition of a different current-rising-rate, 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 from delivery outlet when meeting the trigger condition, and each current-rising-rate distinguishes
The delivery outlet of module and the current amplitude discrimination module merges to form a total delivery outlet；Include:
Step S1 acquires the alternating current on a power grid, the alternating current is converted into digital signal and is filtered；
The filtered digital signal is input in the discrimination system by step S2, in the filtered number
Signal meets the trigger condition of any one in each current-rising-rate discrimination module and the current amplitude discrimination module
When, the pulse signal is exported from total delivery outlet；
Step S3 persistently detects total delivery outlet, sentences when detecting that total delivery outlet exports the pulse signal
It is set to the power grid and short trouble occurs.
Above-mentioned discriminating conduct, wherein the current-rising-rate discrimination module include one first pre-set current value, one second
Pre-set current value, one first preset time and one second preset time, it is default that second pre-set current value is greater than described first
Current value, second preset time is greater than first preset time, and in the step S2, the current-rising-rate distinguishes mould
The discriminating conduct of block includes:
Whether step S2A1, the instantaneous current value for persistently judging that the digital signal indicates are greater than first predetermined current
Value；
It is then to start timing and turn to step S2A2；
It is no, then continue to wait in the step S2A1；
Step S2A2 persistently judges the instantaneous current value of the digital signal expression in second preset time
Whether reach greater 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 turns to step S2A4,
If continuing timing without departing from second preset time；
Step S2A3, judges whether the timing time after stopping is greater than first preset time；
It is then to export the pulse signal, and timing is zeroed and returns to the step S2A1；
It is no, then turn to step S2A4；
It is default persistently to judge whether the instantaneous current value of the digital signal expression is less than described first by step S2A4
Current value；
It is then to return to the step S2A1；
It is no, then continue to wait in the step S2A4.
Above-mentioned discriminating conduct, wherein discriminating conduct according to claim 1, which is characterized in that the electric current width
Being worth discrimination module includes a third pre-set current value and a third preset time, and in the step S2, the current amplitude is distinguished
The discriminating conduct of module includes:
Whether step S2B1, the instantaneous current value for persistently judging that the digital signal indicates are greater than the third predetermined current
Value；
It is then to start timing and turn to step S2B2；
It is no, then continue to wait in the step S2B1；
Step S2B2 persistently judges the instantaneous current value of the digital signal expression in the third preset time
Whether the third pre-set current value is less than；
It is no, if timing time exceeds the third preset time, the pulse signal is exported, and simultaneously by timing zero
The step S2B1 is returned,
If continuing timing without departing from the third preset time；
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 that total delivery outlet exports the pulse signal
It is determined as that short trouble occurs in the power grid when rising edge.
Above-mentioned discriminating conduct, wherein the alternating current on the power grid is acquired with a predeterminated frequency.
Above-mentioned discriminating conduct, wherein in the step S1, using having limit for length's unit impulse response filter to the number
Word pulse is filtered.
Above-mentioned discriminating conduct, wherein in the step S1, have limit for length's unit impulse response filter to institute using 32 ranks
Digit pulse is stated to be filtered.
The utility model has the advantages that a kind of discriminating conduct of short circuit malfunction proposed by the present invention can pick out in several hundred microseconds
Short circuit malfunction is swift in response, and current amplitude protection and current step change protection are combined, and proximal end loads on power grid
It can be distinguished with the short-circuit conditions of distal end load.
Detailed description of the invention
Fig. 1 is the discriminating conduct flow chart of steps of short circuit malfunction in one embodiment of the invention；
Fig. 2 is the step flow chart of the discriminating conduct of current-rising-rate discrimination module in one embodiment of the invention；
Fig. 3 is the principle legend of short circuit malfunction discriminating conduct in one embodiment of the invention.
Specific embodiment
Invention is further explained with reference to the accompanying drawings and examples.
In a preferred embodiment, as shown in Figure 1, proposing 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 are respectively provided with the trigger condition of a different current-rising-rate,
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 meeting trigger condition, 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；Include:
Step S1 acquires the alternating current on a power grid, alternating current is converted into digital signal and is filtered；
Filtered digital signal is input in discrimination system by step S2, is met in filtered digital signal each
When the trigger condition of any one in current-rising-rate discrimination module and current amplitude discrimination module, pulse is exported from total delivery outlet
Signal；
Step S3 persistently detects total delivery outlet, is determined as that power grid occurs when detecting total delivery outlet output pulse signal
Short trouble.
Specifically, which can be by CPLD (Complex Programmable Logic Device, complexity
Programmable logic device) 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, it is default that the second pre-set current value is greater than first
Current value, the second preset time are greater than the first preset time, in step S2, the discriminating conduct packet of current-rising-rate discrimination module
It includes:
Whether step S2A1, the instantaneous current value for persistently judging that digital signal indicates are greater than the first pre-set current value；
It is then to start timing and turn to step S2A2；
It is no, then continue to wait in step S2A1；
Step S2A2 persistently judges whether the instantaneous current value of digital signal expression reaches in the second preset time and is greater 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 turns to step S2A4；
If continuing timing without departing from the second preset time；
Step S2A3, judges whether the timing time after stopping is greater than the first preset time；
Be, then output pulse signal, and by timing zero and return step S2A1；
It is no, then turn to step S2A4；
Whether step S2A4 persistently judges the instantaneous current value of digital signal expression less than the first pre-set current value；
It is, then return step S2A1；
It is no, then continue to wait in step S2A4.
Wherein, the discriminating conduct of different current-rising-rate discrimination modules can be identical, but preset parameter is answered
It is different be directed to different short-circuit conditions；Due to the presence of current spikes in power grid, it is possible that current-rising-rate is prominent
The case where so increasing, but it is the real situation for short circuit occur that such case, which is not, it is therefore desirable to one first preset time is set,
When transient current rises to the time of the second pre-set current value less than the first preset time from the first pre-set current value, ignore this
Electric current rises；Second preset time is for measuring whether the climbing reaches the requirement for being determined as short trouble；First default electricity
Flow valuve is used to start timing when greater than the first pre-set current value as the standard of starting timing；Second pre-set current value is for weighing
Whether amount climbing reaches the requirement for being determined as short trouble.
In a preferred embodiment, discriminating conduct according to claim 1, which is characterized in that current amplitude distinguishes
Module includes a third pre-set current value and a third preset time, in step S2, the discriminating conduct of current amplitude discrimination module
Include:
Whether step S2B1, the instantaneous current value for persistently judging that digital signal indicates are greater than third pre-set current value；
It is then to start timing and turn to step S2B2；
It is no, then continue to wait in step S2B1；
Whether step S2B2, the instantaneous current value for persistently judging that digital signal indicates are less than in third preset time
Third pre-set current value；
It is no, if timing time exceeds third preset time, output pulse signal, and timing is zeroed and returns to step
S2B1,
If continuing timing without departing from third preset time；
It is, then return step S2B1.
Wherein, third preset time is for measuring whether the case where transient current is higher by third pre-set current value 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 when detecting the rising edge of total delivery outlet output pulse signal
It is set to power grid and short trouble occurs.
In a preferred embodiment, in step S1, with the alternating current on predeterminated frequency acquisition power grid.
In a preferred embodiment, in step S1, using having limit for length's unit impulse response filter to digit pulse
It is filtered.
In above-described embodiment, it is preferable that in step S1, have limit for length's unit impulse response filter to digital arteries and veins using 32 ranks
Punching is filtered.
It specifically, can be as shown in figure 3, A/D sampling section be sampled using the high-speed a/d of 16 bit resolutions, by external mould
Quasi- signal is converted to digital signal, and supply subsequent software algorithm uses.A/D Sampling Interface program, N are realized in FPGA or CPLD
Rank FIR filtering, current step change protection and current amplitude are protected, and are executed parallel between each module.FIR filtering is parallel using 32 ranks
FIR filtering, filters out noise.Current step change protection modules A is mainly used for current instantaneous value in ISET1And its occur below proximal end
When short trouble, current protection movement；Current step change protection module B is mainly used for current instantaneous value in ISET1~ISET2Between
When proximal end short trouble occurs, current protection movement；When for power grid far end short failure occurs for current amplitude protective module, electricity
Protection act is flowed, protection threshold value is ISET4。
Realize that steps are as follows:
S01: the high-speed a/d that frequency is fixed to secondary current signal samples, then using 32 rank FIR filters to adopting
Sample result carries out digital filtering, filters out the interference signal of signal；
S02: filtered digital signal enters current step change protection modules A, current step change protection module B and electric current
Amplitude protective module is run independently of each other between each module.In current step change protection module and current amplitude protective module,
The judgement of current step change protection and current amplitude protection is carried out respectively.If some protective module acts, module output one
A width is the high pulse signal of 10ms；
S03: in protection output interface module, first by the output result progress of each protective module or operation, it is merged into one
Road signal；Then, the signal rising edge is constantly detected.It, can be according to system requirements, to outside if detecting the signal rising edge
I/O signal is correspondingly protected in output.
Current step change protection modules A and the parameter of current step change protection module B are different, but climbing protection is sentenced
Constant current journey is identical.Parameter involved in current step change protection modules A: current start value ISET1, current-termination value ISET2,
And ISET1<ISET2, minimum time T1MIN, maximum time T1MAX；Parameter involved in current step change protection module B: electric current
Initiation value ISET2, current-termination value ISET3, and ISET2<ISET3, minimum time T2MIN, maximum time T2MAX.Risen with electric current
For rate protective module A, realize that steps are as follows:
ST01: timer is reset, and constantly compares current instantaneous value and given threshold ISET1Size.If current instantaneous value
Greater than given threshold ISET1, then enter ST02 state；Otherwise, continue to wait in ST01 state；
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 greater than maximum time T1MAX, then enter ST04 state；If electric current is instantaneous
Value is greater than given threshold ISET2, then enter ST03 state；Otherwise, continue to wait in ST02 state；
ST03: comparing timing time and minimum time is T1MIN.If it is T that timing time, which is greater than minimum time,1MIN, then enter
ST05 state；Otherwise, into ST04 state；
ST04: constantly compare current instantaneous value and given threshold ISET1Size.If current instantaneous value is less than given threshold
ISET1, then enter ST01 state；Otherwise, continue to wait in ST04 state；
ST05: after the high pulse signal that one width of output is 10ms, ST01 state is returned to.
Current amplitude protective module parameter are as follows: amplitude protects threshold value ISET4, minimum delay time tmin, realize that steps are as follows:
ST11: timer is reset, and constantly compares current instantaneous value and given threshold ISET4Size.If current instantaneous value
Greater than given threshold ISET4, then enter ST12 state；Otherwise, continue to wait in ST11 state；
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 greater than minimum delay time tmin, then enter ST13 state；If electric
It flows instantaneous value and is less than given threshold ISET4, then enter ST11 state；Otherwise, continue to wait in ST12 state；
ST13: after the high pulse signal that one width of output is 10ms, ST11 state is returned to.
It is assumed that the rated current of ac bus is In, threshold value ISET1It may be configured asThreshold value ISET2It may be configured asThreshold value ISET3It may be configured asThreshold value ISET4It may be configured asThe time T that this method is related to1MIN、
T1MAX、T2MIN、T2MAXIt can be set according to short-circuit climbing, minimum delay time tminIt is traditionally arranged to be 20 μ s.
Moment size of current occurs according to short trouble and short circuit current climbing, short trouble of the present invention are 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, electric current InAnd its it is following.At this point, it is short that proximal end occurs
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 movement.
Situation 2:
Before short trouble occurs, bus is in overlond running state, and electric current is greater than 1.5In.At this point, big in current instantaneous value
In threshold value ISET1Partial region in occur proximal end short trouble, short circuit current climbing is higher, electric current according to the present invention
Climbing protective 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 movement.
Situation 3:
When far end short failure occurs, short circuit current climbing is lower, current step change protection according to the present invention
Modules A and current step change protection module B fail.But current instantaneous value is greater than threshold value ISET4It still is able to be greater than minimum delay
Time tmin, at this point, can satisfy the operation condition of current amplitude of the present invention, trigger amplitude protection act.
In conclusion a kind of discriminating conduct of short circuit malfunction proposed by the present invention can pick out in several hundred microseconds
Short circuit malfunction is swift in response, and current amplitude protection and current step change protection are combined, and proximal end loads on power grid
It can be distinguished with the short-circuit conditions of distal end load.
By description and accompanying drawings, the exemplary embodiments of the specific structure of specific embodiment are given, based on present invention essence
Mind 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 above description, various changes and modifications undoubtedly be will be evident.
Therefore, appended claims should regard the whole variations and modifications for covering true intention and range of the invention as.It is weighing
The range and content of any and all equivalences, are all considered as still belonging to the intent and scope of the invention within the scope of sharp claim.
Claims (8)
1. a kind of discriminating conduct of electric network fault, the discrimination system applied to an electric network fault, which is characterized in that the discrimination system
System includes at least one current-rising-rate discrimination module and current amplitude discrimination module in parallel, and each current-rising-rate is distinguished
Other module is respectively provided with the trigger condition of a different current-rising-rate, and the current amplitude discrimination module has a current amplitude
Trigger condition, the current-rising-rate discrimination module or the current amplitude discrimination module when meeting the trigger condition from
Delivery outlet exports a pulse signal, and each current-rising-rate discrimination module and the current amplitude discrimination module is defeated
Outlet, which merges, forms a total delivery outlet；Include:
Step S1 acquires the alternating current on a power grid, the alternating current is converted into digital signal and is filtered；
The filtered digital signal is input in the discrimination system by step S2, in the filtered digital 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 determined as when detecting that total delivery outlet exports the pulse signal
There is short trouble in the power grid；
Wherein, the current-rising-rate discrimination module includes one first pre-set current value, and one second pre-set current value, one first is pre-
If time and one second preset time, second pre-set current value is greater than first pre-set current value, and described second is default
Time is greater than first preset time, and in the step S2, the discriminating conduct of the current-rising-rate discrimination module includes:
Whether step S2A1, the instantaneous current value for persistently judging that the digital signal indicates are greater than first pre-set current value；
It is then to start timing and turn to step S2A2；
It is no, then continue to wait in the step S2A1；
Step S2A2, persistently judge the instantaneous current value that the digital signal indicates in second preset time whether
Reach and is greater 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 turns to step S2A4,
If continuing timing without departing from second preset time；
Step S2A3, judges whether the timing time after stopping is greater than first preset time；
It is then to export the pulse signal, and timing is zeroed and returns to the step S2A1；
It is no, then turn to step S2A4；
Whether step S2A4, the instantaneous current value for persistently judging that the digital signal indicates are less than first predetermined current
Value；
It is then to return to the step S2A1；
It is no, then continue to wait in the step S2A4.
2. discriminating conduct according to claim 1, which is characterized in that the current amplitude discrimination module includes that a third is pre-
If current value and a third preset time, in the step S2, the discriminating conduct of the current amplitude discrimination module includes:
Whether step S2B1, the instantaneous current value for persistently judging that the digital signal indicates are greater than the third pre-set current value；
It is then to start timing and turn to step S2B2；
It is no, then continue to wait in the step S2B1；
Step S2B2, persistently judge the instantaneous current value that the digital signal indicates in the third preset time whether
It is less than the third pre-set current value；
It is no, if timing time exceeds the third preset time, export the pulse signal, and timing is zeroed and is returned
The step S2B1,
If continuing timing without departing from the third preset time；
It is then to return to the step S2B1.
3. discriminating conduct according to claim 1, which is characterized in that the duration ranges of the pulse signal are in 8ms
Between~12ms.
4. the discriminating conduct according to claim 3, which is characterized in that the duration of the pulse signal is 10ms.
5. discriminating conduct according to claim 1, which is characterized in that in the step S3, detect total delivery outlet
It is determined as that short trouble occurs in the power grid when exporting the rising edge of the pulse signal.
6. discriminating conduct according to claim 1, which is characterized in that described in being acquired on the power grid with a predeterminated frequency
Alternating current.
7. discriminating conduct according to claim 1, which is characterized in that in the step S1, using there is limit for length's unit impulse
Response filter is filtered the digital signal.
8. discriminating conduct according to claim 1, which is characterized in that in the step S1, have limit for length's unit using 32 ranks
Impact response filter is filtered the digital signal.
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| 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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|---|---|---|---|---|
| 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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