CN106385012A - Feeder zero sequence current protection method and device - Google Patents
Feeder zero sequence current protection method and device Download PDFInfo
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- CN106385012A CN106385012A CN201610862070.7A CN201610862070A CN106385012A CN 106385012 A CN106385012 A CN 106385012A CN 201610862070 A CN201610862070 A CN 201610862070A CN 106385012 A CN106385012 A CN 106385012A
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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
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Abstract
The invention relates to a zero sequence current protection method and a zero sequence current protection device for a feeder line. The method comprises the following steps: measuring a power frequency zero sequence current effective value, a power frequency zero sequence voltage effective value and a rated line voltage effective value at a feeder line protection installation position; according to the characteristic that when a fault is grounded through a high resistance, both the zero-sequence current and the zero-sequence voltage of a feeder line can be obviously reduced, on the basis of keeping the current setting value in the original zero-sequence overcurrent protection, a zero-sequence voltage value is added to correct a zero-sequence current measurement value, and whether the obtained correction value is larger than a preset feeder line zero-sequence current protection setting value or not is judged; if yes, the feeder line protection action cuts off the fault line. The invention can realize the self-adaptive effect of the feeder line to the high-resistance single-phase earth fault and improve the tolerance transition resistance value of the feeder line when the single-phase earth fault passes through the transition resistor.
Description
Technical field
The present invention relates to power distribution network technical field of relay protection, more particularly to feeder line zero-sequence protection method and dress
Put.
Background technology
In the power distribution network of large- and-medium size cities, cable run proportion more and more higher, there is connecing during singlephase earth fault
Earth-current greatly increases, and easily produces arc overvoltage, apparatus insulated property and power supply reliability are all adversely affected.For
This, Neutral Point Through Low Resistance mode is widely used in China's urban power distribution network.
Singlephase earth fault as a kind of topmost fault type of power distribution network, in small resistance grounding system main according to
Rely stage zero-sequence current protection to realize it quick and precisely to identify.This Zero Sequence Current Protection susceptiveness is subject to transition resistance
Impact very big it is adaptable to singlephase earth fault and the little situation of transition resistance.
But it is low to there is distribution overhead line in real system, the reason such as feed-in residential block, be susceptible to single-phase through high resistant
Earth fault, and current distribution network feeder frequently with Zero Sequence Current Protection for this line when avoiding singlephase earth fault outside area
The capacitance current value on road, its setting valve is generally large, causes the susceptiveness to high resistance earthing fault in area relatively low, particularly distance
Longer feeder line.If the little fault current long-term existence of numerical value and can not be found to lead to serious consequence.
In guard method for small resistance grounding system high resistance earthing fault, great majority are by detecting earth current institute
The nonlinear distortion feature existing carries out high resistance earthing fault identification, but this kind of method for specific Arc Modelling or connects
The accuracy requirement of earth-current nonlinear characteristic higher it is difficult to reply power distribution network in high resistance earthing fault complexity feature；And
Using the guard method of zero sequence power direction element, then because the presence of neutral point small resistor is so that faulty line and non-faulting
Circuit zero sequence power direction only differs 90 degree about, therefore when high resistance ground residual voltage is less, easily causes homopolar power
The larger calculation error in direction, thus occur judging by accident.
Content of the invention
Based on this, the embodiment of the present invention provides feeder line zero-sequence protection method and device, can adaptive be applied to
High resistant singlephase earth fault, improves the size of its tolerable transition resistance value.
One aspect of the present invention provides feeder line zero-sequence protection method, including：
The power frequency zero-sequence current virtual value of measurement protection for feed line installation place, power frequency residual voltage virtual value and rated line voltage
Virtual value；
Judge described power frequency zero-sequence current virtual value whether more than or equal to default zero-sequence current maximum unbalanced value；If
It is to execute next step；
Judge whether described power frequency zero-sequence current virtual value is more than default feeder line zero-sequence current protection setting valve；If it is not,
Execution next step；
Judge whether described power frequency residual voltage virtual value starts setting valve more than or equal to default residual voltage；If so,
Execution next step；
According to the correction factor of described rated line voltage virtual value, power frequency residual voltage virtual value calculating zero-sequence current, and
According to described correction factor, described power frequency zero-sequence current virtual value is modified, obtains the correction value of feeder line zero-sequence current；
Judge whether the correction value of described feeder line zero-sequence current is more than default feeder line zero-sequence current protection setting valve；If
It is that this faulty line is excised in protection for feed line action.
Another aspect of the present invention provides a kind of feeder line zero-sequence current protection device, including：
Measurement module, power frequency zero-sequence current virtual value, power frequency residual voltage for measuring protection for feed line installation place are effective
Value and rated line voltage virtual value；
First current detection module, for judging whether described power frequency zero-sequence current virtual value is more than or equal to default zero sequence
Electric current maximum unbalanced value；If so, notify the second current detection module；
Second current detection module, if for the described notice receiving the first current detection module, judges described power frequency zero
Whether sequence current effective value is more than default feeder line zero-sequence current protection setting valve；If it is not, notifying first voltage detection module；
First voltage detection module, if for the described notice receiving the second current detection module, judges described power frequency zero
Whether sequence voltage virtual value starts setting valve more than or equal to default residual voltage；If so, notify correcting module；
Correcting module, if for the described notice receiving first voltage detection module, effective according to described rated line voltage
Value, power frequency residual voltage virtual value calculate the correction factor of zero-sequence current, and according to described correction factor to described power frequency zero sequence
Current effective value is modified, and obtains the correction value of feeder line zero-sequence current；
Second voltage detection module, whether the correction value for judging described feeder line zero-sequence current is more than default feeder line zero
Sequence current protection setting valve；If so, notify protection performing module；
And, protect performing module, if for the described notice receiving second voltage detection module, protection for feed line action
Excise this faulty line.
Technique scheme, during according to fault through high resistance ground, the zero-sequence current of feeder line and residual voltage all can substantially subtract
Little feature, on the basis of the current setting in keeping original zero sequence excess current protection, adds residual voltage value to repair
Positive zero sequence current measurement value, correction factor increases with the increase of transition resistance, to reach adaptive effect.Therefore, originally
Invention in the case of not changing original zero sequence excess current protection definite value, by the use of protection for feed line installation place residual voltage as mistake
Cross the index of resistance sizes, zero-sequence current value is modified, to realize it to self adaptation effect during high resistant singlephase earth fault
Really, tolerance transition resistance value during feeder line single-phase resistance eutral grounding fault through transition of generation can be greatly improved, overcome existing little
Resistance grounded system feeder line zero-sequencedirectional protection is resistant to the less defect of transition resistance；With other solution phases existing
Ratio introduces residual voltage amplitude information, and original zero-sequence current protection setting valve is still suitable when high resistance earthing fault occurs
With simpler reliability；And the method only need to increase to residual voltage information on the basis of traditional feeder line zero-sequence current protection
Collection and process it is easy to Project Realization.
Brief description
Fig. 1 is the indicative flowchart of the feeder line zero-sequence protection method of an embodiment；
Fig. 2 is the application example of the feeder line zero-sequence protection method of an embodiment；
Fig. 3 is the schematic diagram of the feeder line zero-sequence current protection device of an embodiment.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.
Fig. 1 is the indicative flowchart of the feeder line zero-sequence protection method of an embodiment；As shown in figure 1, the present embodiment
In feeder line zero-sequence protection method include step：
S11, power frequency zero-sequence current virtual value I of measurement protection for feed line installation placeL0, power frequency residual voltage virtual value U0And volume
Line voltage virtual value Un；
In the present embodiment, power frequency zero-sequence current virtual value IL0For 3 times of power frequency zero-sequence currents.
S12, judges described power frequency zero-sequence current virtual value IL0Whether maximum more than or equal to default zero-sequence current uneven
Value IL0.unb；If so, execution step S13；
In the present embodiment, that is, judge whether to meet IL0≥IL0.unb；If meeting, execution step S13.If the judgement of step S12
Result is no, then do not execute any action, that is, protect without action.Preferably, if periodically carrying out feeder line zero-sequence current
Protection, then need return to step S11 in the case, continues the feeder line zero-sequence current protection of next round.
S13, judges described power frequency zero-sequence current virtual value IL0Whether it is more than default feeder line zero-sequence current protection setting valve
IL0.set；If it is not, execution step S14；
In the present embodiment, that is, judge whether to meet IL0＞ IL0.setIf being unsatisfactory for, execution step S14；If the sentencing of step S13
Disconnected result is yes, then demonstrate the need for protection for feed line action and excise this faulty line, need not carry out subsequent step.Preferably, if
Periodically carry out feeder line zero-sequence current protection, then protection for feed line action needs after excising this faulty line to return in the case
Step S11, continues the feeder line zero-sequence current protection of next round.
S14, judges described power frequency residual voltage virtual value U0Whether start setting valve more than or equal to default residual voltage
U0.set；If so, execution step S15；
In the present embodiment, that is, judge whether to meet U0≥U0.setIf meeting, execution step S15；If the judgement of step S14
Result is no, then do not execute any action, that is, protect without action.Preferably, if periodically carrying out feeder line zero-sequence current
Protection, then need return to step S11 in the case, continues the feeder line zero-sequence current protection of next round.
S15, according to described rated line voltage virtual value Un, power frequency residual voltage virtual value U0Calculate the correction of zero-sequence current
COEFFICIENT K, and according to described adjusted coefficient K to described power frequency zero-sequence current virtual value IL0It is modified, obtain feeder line zero-sequence current
Correction value I '0；Execution step S16；
In the present embodiment, because when fault is through high resistance ground, the zero-sequence current of feeder line and residual voltage all can have substantially
On the basis of the feature reducing, the therefore current setting in keeping zero sequence excess current protection, residual voltage value is added to repair
Positive zero sequence current measurement value, to reach adaptive effect.
S16, judges the correction value I ' of described feeder line zero-sequence current0Whether adjust more than default feeder line zero-sequence current protection
Value IL0.set；If so, this faulty line is excised in protection for feed line action.
In the present embodiment, that is, judge whether to meet I0' ＞ IL0.setIf meeting, this fault wire is excised in protection for feed line action
Road.
If the judged result of step S16 is no, do not execute any action, that is, protect without action.Preferably, if all
Phase property carry out feeder line zero-sequence current protection, then need return to step S11 in the case, continue the feeder line zero-sequence current of next round
Protection.
As a preferred implementation, judge to meet I in step S160' ＞ IL0.setOr judge in step S13
Meet IL0＞ IL0.setAfterwards, carry out protection for feed line action and excise the concrete mode of this faulty line can be：
Start a mask register TL；When detecting whether the timing of described mask register TL reaches default action delay
Long TL.setIf reaching, this faulty line is excised in protection for feed line action, and closes described mask register TL；If not up to, counting
When depositor TL continue timing, until its timing reaches action delay duration TL.set.
It is understood that the feeder line zero-sequence protection method of the present embodiment also includes presetting feeder line zero-sequence current
Protection seting value IL0.set, zero-sequence current maximum unbalanced value IL0.unbAnd residual voltage starts setting valve U0.setStep, with
And set action delay duration TL.setStep.
Wherein, IL0.setSetting and original zero sequence excess current protect as this circuit when avoiding singlephase earth fault outside area
The setting valve of the capacitance current value being flow through is identical；Set IL0.unbValue when, be likely to occur for avoiding zero sequence current mutual inductor
Maximum unbalanced value, depending on the factors such as system asymmetric operation operating mode and zero sequence current mutual inductor precision need to be considered；Set
U0.setValue when need to consider the factors such as the precision of zero sequential potential transformer, normal uneven residual voltage when running depending on.
Below above-described embodiment is further detailed.
Wherein, in step S15, zero sequence is calculated according to described rated line voltage virtual value, power frequency residual voltage virtual value
The concrete mode of the correction factor of electric current can be：
Calculate the adjusted coefficient K of zero-sequence current according to equation below：
Wherein, UnFor the rated line voltage virtual value of protection for feed line installation place, U0Power frequency zero sequence for protection for feed line installation place
Voltage effective value.
In step S15, according to described correction factor, described power frequency zero-sequence current virtual value is modified, obtains feeder line
The concrete mode of the correction value of zero-sequence current can be：
Calculate correction value I of feeder line zero-sequence current according to equation below0′：
I0'=KIL0；
Wherein, K is correction factor, IL0Power frequency zero-sequence current virtual value for protection for feed line installation place.
In conjunction with the feeder line zero-sequence protection method of above-described embodiment, concrete engineering application example is given below.
As shown in Fig. 2 with the data of the transformer station of certain 10kV low resistance grounding as model.The ground connection stood with grounding transformer
Resistance value is 12 Ω；Feeder line 1,2,3,4 length is respectively 4.1km, 4.7km, 2.7km, 3.2km, the electricity that feeder line 1,2,3,4 adopts
Cable model is all YJV22- 3*300, positive order parameter is：R1=0.089 Ω/km, L1=0.261mH/km, C1=0.37 μ F/km,
Zero sequence parameter is：R0=0.089 Ω/km, L0=0.783mH/km, C0=0.37 μ F/km.The load factor of distribution transformer takes
60%, and power factor takes cos θ=0.9.Transition resistance RfTake 0 Ω, 600 Ω, 1200 Ω and 1500 Ω respectively.
It is considered to most serious situation in the present embodiment, the end of feed line length feeder line the longest 2 be provided with single-phase through transition
Resistance eutral grounding trouble point A, the protection act situation of inspection faulty line feeder line 2 and non-fault line feeder line 1, to verify above-mentioned reality
Apply the effectiveness of the feeder line zero-sequence protection method of example.
The setting method of transformer station's original feeder line zero-sequencedirectional protection of Fig. 2 example is：Iact=KrelIC, and consider
The capacitance current of circuit is 2A/km, safety factor Krel=1.5, so the original protection act value of feeder line 1 is Iact=12.3A,
It is I that working value is done in the original protection of feeder line 2act=14.1A.Therefore, the feeder line zero-sequence current protection side based on above-described embodiment
Method, also by the zero-sequencedirectional protection setting valve I of feeder line 1 and feeder line 2L0.setIt is respectively 12.3A and 14.1A；Zero sequence current mutual inductor
Maximum unbalanced value IL0.unbTypically take 3～10A, in order to improve susceptiveness, take 3A here；Residual voltage starts setting valve
U0.setValue according to the precision of related zero sequential potential transformer, take the 1% about of rated voltage, take 58V here；Protection for feed line
The rated line voltage U of installation placenFor 10KV.Zero-sequence current correction value I can be obtained according to above value0' be：
When table 1 is, through different transition resistances, singlephase earth fault occurs, the measurement situation of feeder line 1 and feeder line 2 protection act：
Table 1：
(1) the zero-sequencedirectional protection situation of feeder line 2 is：
1. transition resistance RfDuring=0 Ω：
A. measure and calculate when there is the single-phase resistance eutral grounding fault through transition, the zero-sequence current of protection installation place is effective
It is worth for IL0=435.90A, residual voltage virtual value is U0=5487.81V；
B. judge IL0≥IL0.unbMeet and IL0＞ IL0.setMeet, mask register starts timing, and timing reaches and sets
Faulty line is excised after definite value.
2. transition resistance RfWhen=600 Ω, 1200 Ω：
A. measure and calculate when there is the single-phase resistance eutral grounding fault through transition, the zero-sequence current of protection installation place is effective
Value is respectively IL0=9.47A, IL0=4.79A, residual voltage virtual value is respectively U0=119.27V, U0=60.27V；
B. judge IL0≥IL0.unbMeet, but IL0＞ IL0.setIt is unsatisfactory for, proceed following flow process；
C. judge U0≥U0.setMeet, then the correction factor that can be calculated zero-sequence current is respectively K=48.41, K=
95.79；According to formula I0'=KIL0It is calculated zero-sequence current correction value and be respectively I0'=458.41A, I0'=458.85A.
D. judge I0′≥IL0.setMeet, mask register starts timing, timing excises fault wire after reaching setting value
Road.
3. transition resistance RfDuring=1500 Ω：
A. measure and calculate when there is the single-phase resistance eutral grounding fault through transition, the zero-sequence current of protection installation place is effective
It is worth for IL0=3.84A, residual voltage virtual value is U0=48.32A；
B. judge IL0≥IL0.unbMeet, but IL0＞ IL0.setIt is unsatisfactory for, proceed following flow process；
C. judge U0≥U0.setIt is unsatisfactory for, therefore protection for feed line is failure to actuate.
Be can be seen that by the above protection act process analysis to feeder line 2：Single-phase when occurring in this circuit (feeder line 2)
During through transition resistance eutral grounding fault, carry out the higher zero sequence excessively stream of susceptiveness first and judge, as the starting value of protection, when
The zero-sequence current value of survey calculation gained meets IL0＞ IL0.setWhen, directly enter and execute protection act after line delay, so can be
Transition resistance is less, zero-sequence current larger in the case of need not move through the correction link of residual voltage, thus avoiding correction
Link is brought the impact to protection act reliability, you can so that the advantage that protection keeps conventional overcurrent protection；When high resistant connects
When earth fault tradition zero-sequence current protection susceptiveness is not enough, that is, it is unsatisfactory for IL0＞ IL0.setWhen, then by the use of residual voltage as zero sequence
The foundation of electric current correction, because zero-sequence current adjusted coefficient K can increase with the increase of transition resistance, makes zero-sequence current correction
Value keeps a higher value, reaches adaptive effect, thus improve the susceptiveness to troubles inside the sample space for the protection, enables protection
In the case of high resistance ground, correct action, excises this faulty line.But when transition resistance is excessive, lead to residual voltage value
It is unsatisfactory for U0≥U0.set, then protection cannot correct operation, it is possible to tolerance transition resistance there is higher limit, its be subject to zero sequence
The impact of each side such as voltage measuring transformer precision and zero sequence current mutual inductor certainty of measurement.The tolerance obtaining in the present embodiment
Resistance higher limit is 1200 Ω.
(2) the zero-sequencedirectional protection situation of feeder line 1 is：
1. transition resistance RfDuring=0 Ω：
A. measure and calculate when there is the single-phase resistance eutral grounding fault through transition, the zero-sequence current of protection installation place is effective
It is worth for IL0=7.86A, residual voltage virtual value is U0=5487.81V；
B. judge IL0≥IL0.unbMeet, but IL0＞ IL0.setIt is unsatisfactory for, proceed following flow process；
C. judge U0≥U0.setMeet, the correction factor that can be calculated zero-sequence current is K=1.05, and according to formula
I0'=KIL0Being calculated zero-sequence current correction value is I0'=8.27A.
D. judge I0′≥IL0.setIt is unsatisfactory for, therefore protection for feed line is failure to actuate.
2. transition resistance RfWhen=600 Ω, 1200 Ω, 1500 Ω：
A. measure and calculate when there is the single-phase resistance eutral grounding fault through transition, the zero-sequence current of protection installation place is effective
It is worth for IL0=0.17A, IL0=0.09A, IL0=0.07A, residual voltage virtual value is U0=119.27V, U0=60.27V, U0=
48.32V；
B. judge IL0≥IL0.unbIt is unsatisfactory for, therefore protection for feed line is failure to actuate.
Be can be seen that by the above protection act process analysis to feeder line 1：Occur single-phase to connect through transition resistance outside area
During ground, even if meeting IL0≥IL0.unb, but during due to singlephase earth fault occurring outside area, the zero-sequence current that this circuit flows through is
This line-to-ground total capacitance electric current, and its increase with transition resistance and significantly reduce, therefore meeting U0≥U0.setRight
When zero-sequence current is modified, even if being multiplied by adjusted coefficient K, the correction value obtaining also is maintained at a smaller value it is impossible to reach
Meet I0′≥IL0.set, therefore protect and be failure to actuate.The feeder line zero-sequence protection method of above-described embodiment is being processed as can be seen here
Malfunction will not occur during external area error.
Shown by above-mentioned example：In the present invention, the improvement of feeder line zero-sequencedirectional protection can be protected guaranteeing zero-sequence current
Under the premise of shield is selective, effectively improve its susceptiveness for high resistance earthing fault in area.
By feeder line zero-sequence protection method and its engineer applied example of above-described embodiment, connect through high resistant according to fault
During ground, the feature that the zero-sequence current of feeder line and residual voltage all can be obviously reduced, in keeping original zero sequence excess current protection
Current setting on the basis of, add residual voltage value revising zero sequence current measurement value, correction factor is with transition resistance
Increase and increase, to reach adaptive effect.Therefore, the present invention is not changing the feelings of original zero sequence excess current protection definite value
Under condition, by the use of protection for feed line installation place residual voltage as the index of transition resistance size, zero-sequence current value is modified,
To realize it to self adaptation effect during high resistant singlephase earth fault, feeder line can be greatly improved and occur single-phase to connect through transition resistance
Tolerance transition resistance value during earth fault, overcomes existing small resistance grounding system feeder line zero-sequencedirectional protection to be resistant to transition
The less defect of resistance；Compared with other solutions existing, introduce residual voltage amplitude when high resistance earthing fault occurs
Information, and original zero-sequence current protection setting valve stands good, simpler reliability；And the method only need to be in traditional feeder line
On the basis of zero-sequence current protection, increase to collection and the process of residual voltage information it is easy to Project Realization.
It should be noted that for aforesaid each method embodiment, for easy description, it is all expressed as a series of
Combination of actions, but those skilled in the art should know, and the present invention is not limited by described sequence of movement, because according to
According to the present invention, some steps can be carried out using other orders or simultaneously.
Based on above-described embodiment in feeder line zero-sequence protection method identical thought, the present invention also provides feeder line zero
Sequence current protective device, this device can be used for executing above-mentioned feeder line zero-sequence protection method.For convenience of description, feeder line zero sequence
The structural representation in figure of current protective device embodiment, illustrate only the part related to the embodiment of the present invention, this area skill
Art personnel are appreciated that the restriction of schematic structure not structure twin installation, can include ratio and illustrate more or less of part, or
Person combines some parts, or different part arrangements.
Fig. 3 is the schematic diagram of the feeder line zero-sequence current protection device of one embodiment of the invention.As shown in figure 3, this
The feeder line zero-sequence current protection device of embodiment includes：Measurement module 310, the first current detection module 320, the second current detecting
Module 330, first voltage detection module 340, correcting module 350, second voltage detection module 360 and protection performing module
370, details are as follows for each module：
Described measurement module 310, for measuring power frequency zero-sequence current virtual value, the power frequency zero sequence electricity of protection for feed line installation place
It is pressed with valid value and rated line voltage virtual value；
Whether above-mentioned first current detection module 320, for judging described power frequency zero-sequence current virtual value more than or equal to pre-
If zero-sequence current maximum unbalanced value；If so, notify the second current detection module；
Described second current detection module 330, if for the described notice receiving the first current detection module, judges described
Whether power frequency zero-sequence current virtual value is more than default feeder line zero-sequence current protection setting valve；If it is not, notifying first voltage detection
Module；
Described first voltage detection module 340, if for the described notice receiving the second current detection module, judges described
Whether power frequency residual voltage virtual value starts setting valve more than or equal to default residual voltage；If so, notify correcting module；
Described correcting module 350, if for the described notice receiving first voltage detection module, according to described specified line electricity
It is pressed with valid value, power frequency residual voltage virtual value calculates the correction factor of zero-sequence current, and according to described correction factor to described work
Frequency zero-sequence current virtual value is modified, and obtains the correction value of feeder line zero-sequence current；
The specific implementation of correcting module 350 refers to said method embodiment.
Whether described second voltage detection module 360, for judging the correction value of described feeder line zero-sequence current more than default
Feeder line zero-sequence current protection setting valve；If so, notify protection performing module；
And, described protection performing module 370, if for the described notice receiving second voltage detection module, feeder line
Protection act excises this faulty line.
Preferably, described second current detection module 330, if be additionally operable to judge that described power frequency zero-sequence current virtual value is big
In default feeder line zero-sequence current protection setting valve, notify described protection performing module；Described protection performing module 370, also uses
If in the notice receiving described second current detection module, this faulty line is excised in protection for feed line action.
Preferably described protection performing module 370 includes：
Delay unit, if for the notice receiving described second current detection module or second voltage detection module, starts
One mask register；And, performance element, whether the timing for detecting described mask register reaches default action delay
Duration, if reaching, this faulty line is excised in protection for feed line action.
As another preferred implementation, described feeder line zero-sequence current protection device also includes：(in figure is not for setup module
Illustrate), it is used for presetting feeder line zero-sequence current protection setting valve, zero-sequence current maximum unbalanced value and residual voltage starting
Setting valve；And preset action delay duration.
By the feeder line zero-sequence current protection device of above-described embodiment, during according to fault through high resistance ground, the zero sequence of feeder line
The feature that electric current and residual voltage all can be obviously reduced, the base of the current setting in keeping original zero sequence excess current protection
On plinth, residual voltage value is added to revise zero sequence current measurement value, correction factor can increase with the increase of transition resistance, with
Reach adaptive effect.Therefore, the present invention can greatly improve feeder line occur the single-phase resistance eutral grounding fault through transition when resistance to
By transition resistance value, compared with the current solution proposing, due to make use of residual voltage and faulty line zero-sequence current
Relation mainly determines this feature, clear physics conception by neutral point small resistor；Zero is introduced only when high resistance earthing fault occurs
Sequence voltage amplitude information, and original zero-sequence current protection setting valve stands good, therefore simpler reliability；And the method
Only collection and process to residual voltage information need to be increased it is easy to Project Realization on the basis of traditional feeder line zero-sequence current protection.
It should be noted that in the embodiment of feeder line zero-sequence current protection device of above-mentioned example, each module/unit it
Between information exchange, the content such as implementation procedure, due to being based on same design, its skill brought with preceding method embodiment of the present invention
Art effect is identical with preceding method embodiment of the present invention, and particular content can be found in the narration in the inventive method embodiment, herein
Repeat no more.
Additionally, in the embodiment of feeder line zero-sequence current protection device of above-mentioned example, the logical partitioning of each functional module
It is merely illustrative of, can as needed in practical application, such as the configuration requirement for corresponding hardware or the realization of software
Convenient consideration, above-mentioned functions distribution completed by different functional modules, will described feeder line zero-sequence current protection device
Internal structure is divided into different functional modules, to complete all or part of function described above.Wherein each function mould was both
Can be to be realized in the form of hardware, it would however also be possible to employ the form of software function module is realized.
It will appreciated by the skilled person that realizing all or part of flow process in above-described embodiment method, it is can
Completed with the hardware instructing correlation by computer program, described program can be stored in an embodied on computer readable storage and be situated between
In matter, as independent production marketing or use.Described program upon execution, can perform as above-mentioned each method embodiment complete
Portion or part steps.Wherein, described storage medium can be magnetic disc, CD, read-only memory (Read-Only
Memory, ROM) or random access memory (Random Access Memory, RAM) etc..
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and does not have the portion described in detail in certain embodiment
Point, may refer to the associated description of other embodiments.It is appreciated that term " first " used in it, " second " etc. are at this
It is used for distinguishing object in literary composition, but these objects should not be limited by these terms.
Embodiment described above only have expressed the several embodiments of the present invention it is impossible to be interpreted as to the scope of the claims of the present invention
Restriction.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise,
Some deformation can also be made and improve, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention
Should be defined by claims.
Claims (10)
1. a kind of feeder line zero-sequence protection method is it is characterised in that include：
The power frequency zero-sequence current virtual value of measurement protection for feed line installation place, power frequency residual voltage virtual value and rated line voltage are effective
Value；
Judge described power frequency zero-sequence current virtual value whether more than or equal to default zero-sequence current maximum unbalanced value；If so, hold
Row next step；
Judge whether described power frequency zero-sequence current virtual value is more than default feeder line zero-sequence current protection setting valve；If it is not, execution
Next step；
Judge whether described power frequency residual voltage virtual value starts setting valve more than or equal to default residual voltage；If so, execute
Next step；
According to the correction factor of described rated line voltage virtual value, power frequency residual voltage virtual value calculating zero-sequence current, and according to
Described correction factor is modified to described power frequency zero-sequence current virtual value, obtains the correction value of feeder line zero-sequence current；
Judge whether the correction value of described feeder line zero-sequence current is more than default feeder line zero-sequence current protection setting valve；If so, present
Line protection act excises this faulty line.
2. feeder line zero-sequence protection method according to claim 1 is it is characterised in that judge described power frequency zero-sequence current
After whether virtual value is more than the step of default feeder line zero-sequence current protection setting valve, also include：
If described power frequency zero-sequence current virtual value is more than default feeder line zero-sequence current protection setting valve, protection for feed line action is excised
This faulty line.
3. feeder line zero-sequence protection method according to claim 2 is it is characterised in that judging described feeder line zero sequence
If the correction value of electric current is more than default feeder line zero-sequence current protection setting valve or judges that described power frequency zero-sequence current is effective
After value is more than default feeder line zero-sequence current protection setting valve, before the step of this faulty line is excised in protection for feed line action,
Including：
Start a mask register；Detect whether the timing of described mask register reaches default action delay duration, if reaching
Arrive, this faulty line is excised in protection for feed line action.
4. feeder line zero-sequence protection method according to claim 2 is it is characterised in that have according to described rated line voltage
Valid value, the step of the correction factor of power frequency residual voltage virtual value calculating zero-sequence current are：
Calculate the adjusted coefficient K of zero-sequence current according to equation below：
Wherein, UnFor the rated line voltage virtual value of protection for feed line installation place, U0Power frequency residual voltage for protection for feed line installation place
Virtual value.
5. feeder line zero-sequence protection method according to claim 4 is it is characterised in that according to described correction factor to institute
State power frequency zero-sequence current virtual value to be modified, the step obtaining the correction value of feeder line zero-sequence current includes：
Calculate correction value I of feeder line zero-sequence current according to equation below0′：
I0'=KIL0；
Wherein, K is correction factor, IL0Power frequency zero-sequence current virtual value for protection for feed line installation place.
6. feeder line zero-sequence protection method according to claim 2 is it is characterised in that also include：
Preset feeder line zero-sequence current protection setting valve, zero-sequence current maximum unbalanced value and residual voltage starting to adjust
Value；
Also include：Preset action delay duration.
7. a kind of feeder line zero-sequence current protection device is it is characterised in that include：
Measurement module, for measure the power frequency zero-sequence current virtual value of protection for feed line installation place, power frequency residual voltage virtual value and
Rated line voltage virtual value；
First current detection module, for judging whether described power frequency zero-sequence current virtual value is more than or equal to default zero-sequence current
Maximum unbalanced value；If so, notify the second current detection module；
Second current detection module, if for the described notice receiving the first current detection module, judges described power frequency zero sequence electricity
Whether stream virtual value is more than default feeder line zero-sequence current protection setting valve；If it is not, notifying first voltage detection module；
First voltage detection module, if for the described notice receiving the second current detection module, judges described power frequency zero sequence electricity
It is pressed with whether valid value starts setting valve more than or equal to default residual voltage；If so, notify correcting module；
Correcting module, if for the described notice receiving first voltage detection module, according to described rated line voltage virtual value, work
Frequency residual voltage virtual value calculates the correction factor of zero-sequence current, and according to described correction factor, described power frequency zero-sequence current is had
Valid value is modified, and obtains the correction value of feeder line zero-sequence current；
Whether second voltage detection module, for judging the correction value of described feeder line zero-sequence current more than default feeder line zero sequence electricity
Stream protection seting value；If so, notify protection performing module；
And, protect performing module, if for the described notice receiving second voltage detection module, protection for feed line action is excised
This faulty line.
8. feeder line zero-sequence current protection device according to claim 7 is it is characterised in that described second current detecting mould
Block, if being additionally operable to judge that described power frequency zero-sequence current virtual value is more than default feeder line zero-sequence current protection setting valve, notifies
Described protection performing module；
Described protection performing module, if being additionally operable to receive the notice of described second current detection module, protection for feed line action is cut
Except this faulty line.
9. feeder line zero-sequence current protection device according to claim 8 is it is characterised in that described protection performing module bag
Include：
Delay unit, if for the notice receiving described second current detection module or second voltage detection module, starts a meter
When depositor；
Performance element, whether the timing for detecting described mask register reaches default action delay duration, if reaching, feedback
Line protection act excises this faulty line.
10. feeder line zero-sequence current protection device according to claim 9 is it is characterised in that also include：
Setup module, is used for presetting feeder line zero-sequence current protection setting valve, zero-sequence current maximum unbalanced value and zero sequence
Voltage start setting valve；And preset action delay duration.
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| CN201610862070.7A CN106385012B (en) | 2016-09-28 | 2016-09-28 | Feeder zero sequence current protection method and device |
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| CN108037402A (en) * | 2017-11-20 | 2018-05-15 | 华南理工大学 | A kind of small resistance grounding system single-phase high-impedance detection method |
| CN108445347A (en) * | 2018-04-28 | 2018-08-24 | 广东电网有限责任公司 | A kind of single-phase earth fault detecting method based on line equivalent impedance value |
| CN108594071A (en) * | 2018-04-18 | 2018-09-28 | 广东电网有限责任公司 | A kind of single-phase earth fault detecting method of neutral grounding by small resistance distribution |
| CN108879608A (en) * | 2018-07-12 | 2018-11-23 | 三峡大学 | Transformer zero sequence excess current guard method based on the variation of zero-sequence current phase-space distributions center of gravity amplitude |
| CN114268076A (en) * | 2021-12-08 | 2022-04-01 | 广东电网有限责任公司 | Zero sequence current protection method, zero sequence current protection system, electronic equipment and storage medium |
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| CN108879608A (en) * | 2018-07-12 | 2018-11-23 | 三峡大学 | Transformer zero sequence excess current guard method based on the variation of zero-sequence current phase-space distributions center of gravity amplitude |
| CN114268076A (en) * | 2021-12-08 | 2022-04-01 | 广东电网有限责任公司 | Zero sequence current protection method, zero sequence current protection system, electronic equipment and storage medium |
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