CN104577999B - Bus bar protecting method and system based on transient zero-sequence current feature - Google Patents
Bus bar protecting method and system based on transient zero-sequence current feature Download PDFInfo
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Abstract
The invention discloses the bus bar protecting method based on transient zero-sequence current feature and system, wherein, methods described includes：The vector of the zero-sequence current of all circuits is obtained in real time；Then, by the absolute value of the vector compared with threshold current set in advance：If the absolute value of the vector is more than threshold current set in advance, it is determined as bus singlephase earth fault；After there is bus singlephase earth fault, judge that the order of severity of busbar grounding failure belongs to first order of severity or second order of severity, and use corresponding measure：If belonging to first order of severity, after delay, wiretap is jumped into；Corresponding warning is sent if second order of severity is belonged to.Bus single phase earthing protection function can technically be met well, in engineering, single-phase earth fault line selection technology can be integrated, realize the total solution of busbar grounding, line-to-ground, it is easy to implement reliable, there is good marketing application prospect.
Description
Technical field
The present invention relates to single phase earthing protection technical field, more particularly to based on transient zero-sequence current feature
Bus bar protecting method and system.
Background technology
Singlephase earth fault is the most common failure mode of distribution network system, accounts for institute faulty more than 80%.In recent years,
Route selection technology based on zero-sequence current transient state component is developed rapidly and applied, especially adaptive zero-sequence current fault signature
Selection method, its route selection accuracy rate become closer to the reliability of relay protection action.It is single-phase with the raising of route selection accuracy
Earth fault selects jump technology to start to be applied and promote, and especially, research and application of the Guizhou Power Grid in the field are walked in state
Interior forefront, and it is increasingly ripe.
Because phase fault is often by singlephase earth fault development evolvement, therefore, when generation single-phase earthing
When need to cut off failure as early as possible.But in actual production running, when detect line single phase grounding failure occurs when, often
Different treatment measures are taken depending on ground path load significance level, system failure operation time with ground difference,
If developing into phase fault during failture evacuation, by protecting directly tripping operation excision failure.
Compared with circuit, the probability that bus breaks down is relatively small, and research and attention of the people to this are inadequate, especially
In 35kV and following low-voltage network.China's national standard《Relay protection and automatic safety device technical regulation》Regulation：
(1) in 110kV double-bus and 220kV and the bus of the above, to ensure that rapidly selectively excision is appointed
Failure on one group of (or section) bus, and another group of (or section) fault-free bus remains to continue to run with, and should install special bus
Protection.Two sets of bus protections should be installed for every group of bus of bus scheme with one and half breaker.
(2) more than 110kV single busbar, the 35kV buses in important power plant or high-pressure side are the important of 110kV and the above
The 35kV buses of step-down substation, when must quickly cut off the failure on bus according to the requirement of system, special mother should be installed
Line is protected.
The regulation of code means：Most 35kV and the bus of following voltage class simultaneously need not install special mother
Line is protected.Actually also in this way, most of low-voltage bus bars at present install special bus protection, can only rely on band delay
The transform er backup protection or inlet wire overcurrent protection of (coordinating with protection for feed line needs, to prevent tripping operation of bypassing the immediate leadership) are tackled.Due to
Bus-bar fault compares less, and people do not pay attention to the hidden danger of this settling mode behind, and for bus-bar fault once occurring, consequence will
It is extremely serious, because：
1) bus is in transformer outlet, and short circuit current is very big during failure, and band delay excision influences on equipment safety operation
It is very big；
2) busbar short-circuit causes whole bus dead electricity, it is very wide to influence face, it is necessary to cut off inlet wire.
Bus-bar fault is one of failure of electrical equipment most serious, and bus singlephase earth fault is to trigger busbar short-circuit event
The main reason for barrier.
In view of this, low-voltage network bus single phase earthing protection method is studied, how to realize reliable recognition bus
It is grounded and quickly cuts off in time, is one of current urgent problem to be solved.
The content of the invention
It is an object of the invention to provide the bus bar protecting method based on transient zero-sequence current feature and system, it is intended to solves
The problem of existing 35kV and the bus of following voltage class are without special bus protection scheme.
Technical scheme is as follows：
A kind of bus bar protecting method based on transient zero-sequence current feature, wherein, comprise the following steps：
S100, obtain in real time all circuits zero-sequence current vector；
S200, by the absolute value of the vector compared with threshold current set in advance：If the vector
Absolute value is more than threshold current set in advance, then is determined as bus singlephase earth fault；
S300, after there is bus singlephase earth fault, judging the order of severity of busbar grounding failure, to belong to first serious
Degree or second order of severity, and use corresponding measure：If belonging to first order of severity, after delay, jump into line and open
Close；Corresponding warning is sent if second order of severity is belonged to.
The described bus bar protecting method based on transient zero-sequence current feature, wherein, the threshold current set in advance
Take the numerical value between 1.5 times to 2 times of the absolute value of the vector of all circuit zero-sequence currents under normal operating condition.
The described bus bar protecting method based on transient zero-sequence current feature, wherein, in the step S200, if the arrow
The absolute value of amount sum is less than threshold current set in advance, then is determined as line single phase grounding failure.
The described bus bar protecting method based on transient zero-sequence current feature, wherein, in the step S300, judge bus
The order of severity of earth fault belongs to first order of severity or second order of severity specifically uses：Compare ILWith ISetSize；
If IL>ISet, then first order of severity is belonged to；
Wherein, ILFor arc suppression coil compensation electric current, ISetFor 0.5 times~0.9 times of system maximum capacitor electric current.
A kind of bus bar protecting method based on transient zero-sequence current feature, wherein, comprise the following steps：
S110, the stalling current and difference current for obtaining all circuits in real time；
S210, by the stalling current compared with stalling current threshold value set in advance：If the stalling current
During more than stalling current threshold value, then after stalling current is multiplied by into ratio brake coefficient, compared with difference current：It is if differential
Electric current is larger, then is determined as busbar grounding；
S310, after there is bus singlephase earth fault, judging the order of severity of busbar grounding failure, to belong to first serious
Degree or second order of severity, and use corresponding measure：If belonging to first order of severity, after delay, jump into line and open
Close；Corresponding warning is sent if second order of severity is belonged to.
The described bus bar protecting method based on transient zero-sequence current feature, wherein, also include in the step S110：For
Error action of device when preventing circuit interphase short circuit grounding fault, then gather three-phase voltage, when line voltage imbalance, implement locking
Protection；Or increase action delay, escape maximum circuit actuation time.
The described bus bar protecting method based on transient zero-sequence current feature, wherein, in the step S310, judge bus
The order of severity of earth fault belongs to first order of severity or second order of severity specifically uses：Compare ILWith ISetSize；
If IL>ISet, then first order of severity is belonged to；
Wherein, ILFor arc suppression coil compensation electric current, ISetFor 0.5 times~0.9 times of system maximum capacitor electric current.
The described bus bar protecting method based on transient zero-sequence current feature, wherein, the stalling current threshold value takes just
1.5~2 times of out-of-balance current when often running.
A kind of bus protection relay system based on transient zero-sequence current feature, wherein, including：
First acquisition unit, for obtaining the stalling current and difference current of all circuits in real time；
First comparing unit, for by the stalling current compared with stalling current threshold value set in advance：If
When the stalling current is more than stalling current threshold value, then after stalling current is multiplied by into ratio brake coefficient, enter with difference current
Row compares：If difference current is larger, it is determined as busbar grounding；
First protective unit, for after there is bus singlephase earth fault, judging the order of severity of busbar grounding failure
Belong to first order of severity or second order of severity, and use corresponding measure：If belonging to first order of severity, through delay
Afterwards, wiretap is jumped into；Corresponding warning is sent if second order of severity is belonged to.
A kind of bus protection relay system based on transient zero-sequence current feature, wherein, including：
Second acquisition unit, the vector of the zero-sequence current for obtaining all circuits in real time；
Second comparing unit, for by the absolute value of the vector compared with threshold current set in advance：If
The absolute value of the vector is more than threshold current set in advance, then is determined as bus singlephase earth fault；
Second protective unit, for after there is bus singlephase earth fault, judging the order of severity of busbar grounding failure
Belong to first order of severity or second order of severity, and use corresponding measure：If belonging to first order of severity, through delay
Afterwards, wiretap is jumped into；Corresponding warning is sent if second order of severity is belonged to.
Bus bar protecting method and system provided by the present invention based on transient zero-sequence current feature, technically can be very
Meet bus single phase earthing protection function well, in engineering, single-phase earth fault line selection technology can be integrated, realize female
Line ground connection, the total solution of line-to-ground, it is easy to implement reliable, there is good marketing application prospect.
Brief description of the drawings
Fig. 1 is the flow chart of the first embodiment of the bus bar protecting method based on transient zero-sequence current feature of the present invention.
Fig. 2 is the flow chart of the second embodiment of the bus bar protecting method based on transient zero-sequence current feature of the present invention.
Fig. 3 is operation curve in the second embodiment of the bus bar protecting method based on transient zero-sequence current feature of the present invention
Schematic diagram.
Embodiment
The present invention provide bus bar protecting method and system based on transient zero-sequence current feature, for make the purpose of the present invention,
Technical scheme and effect are clearer, clear and definite, and the present invention is described in more detail below.It is it should be appreciated that described herein
Specific embodiment only to explain the present invention, is not intended to limit the present invention.
In order to facilitate understanding, this programme the principle on which is introduced first.
For a long time, people study small current earthing wire-selecting, mainly for the singlephase earth fault occurred on circuit, its according to
According to having at 2 points：
Firstth, faulty line zero-sequence current is equal to non-fault line zero-sequence current sum, amplitude maximum；
Secondth, faulty line zero-sequence current flows to bus, and non-fault line zero-sequence current flows to circuit, and both are anti-phase.
Under being acted in arc suppression coil compensation, stable state fundamental wave zero sequence electric current is unsatisfactory for above-mentioned relation, thus current route selection
Technology is based on transient state route selection technology.Existing transient state route selection technology has detection well for line single phase grounding failure
Recognition capability, but to busbar grounding, then Detection results are bad, only because busbar grounding number is few, does not arouse attention and pay attention to.
The main reason for Detection results are bad is " not having bus zero-sequence current ", and above-mentioned two principle does not apply to.Bus is special due to it
Different position, zero sequence current detection device can not be installed, thus zero-sequence current can not be detected, it is impossible to bus zero-sequence current
Route selection is participated in as a parameter.Therefore, in engineering design, often emphasize to require inlet wire to include route selection, its purpose except
More preferable to distinguish outside higher level's line-to-ground, more major reason is to ensure that zero-sequence current meets above-mentioned two principle relation.
Detecting the method for busbar grounding failure is：
If the 3rd, all circuit zero-sequence currents flow to bus, busbar grounding circuit is judged to.
The principle is really the reverse supplement to second principle, and the principle is to set up in theory, but in practical application
In, some are compared with short circuit because capacitance current is small, and plus the influence of interference signal or out-of-balance current, zero sequence current signal is adopted
Result of calculation after sample digital quantization can not meet the phase relation of the 3rd principle, easily cause and falsely drop.Therefore, low current
The result that earthing wire-selecting technology occurs in actual applications is：Line-to-ground, line selection apparatus action are accurate high；Bus connects
Ground, easily falsely drop circuit.
For from this meaning, bus singlephase earth fault is studied, no matter for route selection technology, or it is female for solving
Line failure, all with positive effect.
Further, bus singlephase earth fault, dealt with than general line single phase grounding failure it is more complicated, more
Difficulty, and due to involving a wide range of knowledge, counting for much, thus be also required to it is more careful.
Bus singlephase earth fault action logic, it is related to two aspects：
(1) operation condition setting；
Operation condition is the means for ensureing busbar grounding protection action message, it is desirable to accomplishes external ground not malfunction, bus
Not tripping is grounded, and can be handled accordingly according to fault severity level.
(2) troubleshooting mode：
After busbar grounding occurs, it should start and the different handling process of general line-to-ground.Such as：Fast trip or
Level 1Alarming etc..
This programme is as follows using " being based on transient zero-sequence current feature band bus differential protection " technology, its principle：
After earth fault occurs for circuit (not including bus), faulty line zero-sequence current is equal to total system non-faulting element
The summation (not including faulty line) of capacitive earth current in itself, capacitive reactive power direction are to flow to bus by circuit, side
To opposite with non-fault line.
According to above-mentioned theory, faulty line zero-sequence current is calculated, is obtained：
Above formula is applied to be based on zero-sequence current transient signal route selection technology.Obtained by formula (1)：
I.e.：
Wherein：M is all circuit numbers, and n is non-fault line number, m=n+1；
Then can be with it is concluded that 1 by above formula：When singlephase earth fault occurs for circuit (not including bus), all circuits
The vector of zero-sequence current is equal to zero.
Similarly, when singlephase earth fault occurs for bus, the zero-sequence current that trouble point is flowed through is equal to total system non-faulting
The summation of element capacitive earth current, the capacitive reactive power direction of non-faulting element are to flow to circuit by bus.Therefore, count
Trouble point zero-sequence current is calculated, is obtained：
It can be seen that
Then can be with it is concluded that 2：When singlephase earth fault occurs for bus, the vector of all circuit zero-sequence currents is long-range
In zero.
According to above-mentioned conclusion 1 and conclusion 2, we can set an action threshold ISet1, work as satisfaction：
1)When, it is judged to line single phase grounding failure；
2)When, it is judged to bus singlephase earth fault.
ISet1Setting method：Take under normal operation1.5~2 times.Dynamic calculation during plant running.
According to such scheme, the invention provides a kind of bus bar protecting method based on transient zero-sequence current feature, such as Fig. 1
It is shown, comprise the following steps：
S100, obtain in real time all circuits zero-sequence current vector；
S200, by the absolute value of the vector compared with threshold current set in advance：If the vector
Absolute value is more than threshold current set in advance, then is determined as bus singlephase earth fault；
S300, after there is bus singlephase earth fault, judging the order of severity of busbar grounding failure, to belong to first serious
Degree or second order of severity, and use corresponding measure：If belonging to first order of severity, after delay, jump into line and open
Close；Corresponding warning is sent if second order of severity is belonged to.
Further, in the step S300, judge that the order of severity of busbar grounding failure belongs to first order of severity also
It is that second order of severity specifically uses：Compare ILWith ISetSize；If IL>ISet, then first order of severity is belonged to；Wherein, ILFor
Arc suppression coil compensation electric current, ISetFor 0.5 times~0.9 times of system maximum capacitor electric current.
Found through overtesting, the setting mode of such scheme is not reasonable, and line-to-ground is easily judged by accident into busbar grounding.Cause
This, present invention also offers a set of improved plan：
First, make
Wherein, idFor difference current, irFor stalling current, K1For ratio brake coefficient.
According to above-mentioned conclusion 1 and conclusion 2, it is known that：
(1) during line-to-ground,Then：id=0, K1=0；
(2) during busbar grounding,Then：id=ir, K1=1；
But in practice, due to mutual inductor ratio and progress of disease error, during line-to-ground, K1Commonly greater than 0, and work as bus
During ground connection, K1Compare exactly equal to 1, that is to say, that：K1For value closer to 0, the probability of line-to-ground is bigger；K1Value more connects
1 is bordering on, the probability of busbar grounding is bigger.Consider above-mentioned factor, take K1=0.5~0.9, obtaining female poor operation equation is：
id＞ K1·ir(ir＞ ir0)(4)
Its operation curve is as shown in figure 3, wherein, ir0For stalling current threshold, out-of-balance current during normal operation is taken as1.5~2 times.
It can be seen that when
1)ir＜ ir0When, bus disturbance；
2)ir＞ ir0, id＞ K1·irWhen, it is busbar grounding；
3)ir＞ ir0, id≤K1·irWhen, it is line-to-ground；
4)K1It is as a result invalid during ＞ 1.
Based on above-mentioned principle, the invention provides a kind of bus bar protecting method based on transient zero-sequence current feature, such as Fig. 2
It is shown, comprise the following steps：
S110, the stalling current and difference current for obtaining all circuits in real time；
S210, by the stalling current compared with stalling current threshold value set in advance：If the stalling current
During more than stalling current threshold value, then after stalling current is multiplied by into ratio brake coefficient, compared with difference current：It is if differential
Electric current is larger, then is determined as busbar grounding；
S310, after there is bus singlephase earth fault, judging the order of severity of busbar grounding failure, to belong to first serious
Degree or second order of severity, and use corresponding measure：If belonging to first order of severity, after delay, jump into line and open
Close；Corresponding warning is sent if second order of severity is belonged to.
Error action of device during in order to prevent circuit interphase short circuit grounding fault, following two solutions can be taken：Mode 1：
Gather three-phase voltage, when line voltage imbalance (such as less than 75V), latch-up protection.Mode 2：Increase action delay, escape maximum
Circuit actuation time.
Further, in the step S310, judge that the order of severity of busbar grounding failure belongs to first order of severity also
It is that second order of severity specifically uses：Compare ILWith ISetSize；If IL>ISet, then first order of severity is belonged to；Wherein, ILFor
Arc suppression coil compensation electric current, ISetFor 0.5 times~0.9 times of system maximum capacitor electric current.
It is corresponding with the above method, the invention provides a kind of bus protection relay system based on transient zero-sequence current feature,
It includes：
First acquisition unit, for obtaining the stalling current and difference current of all circuits in real time；
First comparing unit, for by the stalling current compared with stalling current threshold value set in advance：If
When the stalling current is more than stalling current threshold value, then after stalling current is multiplied by into ratio brake coefficient, enter with difference current
Row compares：If difference current is larger, it is determined as busbar grounding；
First protective unit, for after there is bus singlephase earth fault, judging the order of severity of busbar grounding failure
Belong to first order of severity or second order of severity, and use corresponding measure：If belonging to first order of severity, through delay
Afterwards, wiretap is jumped into；Corresponding warning is sent if second order of severity is belonged to.
Present invention also offers a kind of bus protection relay system based on transient zero-sequence current feature, it includes：
Second acquisition unit, the vector of the zero-sequence current for obtaining all circuits in real time；
Second comparing unit, for by the absolute value of the vector compared with threshold current set in advance：If
The absolute value of the vector is more than threshold current set in advance, then is determined as bus singlephase earth fault；
Second protective unit, for after there is bus singlephase earth fault, judging the order of severity of busbar grounding failure
Belong to first order of severity or second order of severity, and use corresponding measure：If belonging to first order of severity, through delay
Afterwards, wiretap is jumped into；Corresponding warning is sent if second order of severity is belonged to.
The detail of the functional module has all described in the above-mentioned methods, does not just repeat one by one here.
In order to verify the feasibility of " transient zero-sequence current feature band bus differential protection " principle, live recording multigroup to 2000
Data carry out inverting test.Test result shows：
1) when busbar grounding, 0.875<K1<1.0；
2) when line-to-ground, K1=0.013~0.43.
Due to the importance of bus, to improve the reliability of female differential work, K can use1=0.9.
In addition, for ensure this programme bus differential protection under extreme operating condition not malfunction, it is necessary to consider in practical application influence protect
Protect the factor of Reliability of Microprocessor, mainly CT property differences, including CT no-load voltage ratios, CT progress of disease feature, CT capacity etc., wherein influenceing most
Big is CT no-load voltage ratios.Assuming that there are 21 outlets in certain transformer station, all line lengths are consistent, and maximum CT no-load voltage ratios are minimum CT no-load voltage ratios
5 times, then,
When circuit where maximum CT no-load voltage ratios is grounded,
It can be seen that K1<0.9, K1Line-to-ground fault feature is still presented in value, does not influence route selection result.Have 5 even in CT no-load voltage ratios
Under the extreme operating condition of times difference, this programme bus differential protection remains to action message.
It is worth noting that, the system can adjust the CT no-load voltage ratios of each circuit on demand, each line zero is being calculated
Software correction is carried out during sequence electric current, avoids the influence of CT no-load voltage ratios, greatly improves the reliability of protection act.
In summary, bus bar protecting method and system provided by the invention based on transient zero-sequence current feature, wherein, institute
The method of stating includes：The vector of the zero-sequence current of all circuits is obtained in real time；Then, by the absolute value of the vector and in advance
The threshold current of setting is compared：If the absolute value of the vector is more than threshold current set in advance, it is determined as mother
Line singlephase earth fault；After there is bus singlephase earth fault, judging the order of severity of busbar grounding failure, to belong to first tight
Weight degree or second order of severity, and use corresponding measure：If belonging to first order of severity, after delay, line is jumped into
Switch；Corresponding warning is sent if second order of severity is belonged to.Bus singlephase earth fault can technically be met well
Defencive function, in engineering, single-phase earth fault line selection technology can be integrated, realizes the global solution of busbar grounding, line-to-ground
Certainly scheme, it is easy to implement reliable, there is good marketing application prospect.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (5)
1. a kind of bus bar protecting method based on transient zero-sequence current feature, it is characterised in that comprise the following steps：
S100, obtain in real time all circuits zero-sequence current vector；
S200, by the absolute value of the vector compared with threshold current set in advance：If the vector is absolute
Value is more than threshold current set in advance, then is determined as bus singlephase earth fault；
S300, after there is bus singlephase earth fault, judge that the order of severity of busbar grounding failure belongs to first order of severity
Or second order of severity, and use corresponding measure：If belonging to first order of severity, after delay, wiretap is jumped into；If
Belong to second order of severity and then send corresponding warning；
The threshold current set in advance takes the absolute value of the vector of all circuit zero-sequence currents under normal operating condition
Numerical value between 1.5 times to 2 times；
In the step S300, judge that the order of severity of busbar grounding failure belongs to first order of severity or second order of severity
It is specific to use：Compare ILWith ISetSize；If IL>ISet, then first order of severity is belonged to；
Wherein, ILFor arc suppression coil compensation electric current, ISetFor 0.5 times~0.9 times of system maximum capacitor electric current.
2. the bus bar protecting method according to claim 1 based on transient zero-sequence current feature, it is characterised in that the step
In rapid S200, if the absolute value of the vector is less than threshold current set in advance, it is determined as line single phase grounding failure.
3. a kind of bus bar protecting method based on transient zero-sequence current feature, it is characterised in that comprise the following steps：
S110, the stalling current and difference current for obtaining all circuits in real time；
S210, by the stalling current compared with stalling current threshold value set in advance：If the stalling current is more than
During stalling current threshold value, then after stalling current is multiplied by into ratio brake coefficient, compared with difference current：If difference current
It is larger, then it is determined as busbar grounding；
S310, after there is bus singlephase earth fault, judge that the order of severity of busbar grounding failure belongs to first order of severity
Or second order of severity, and use corresponding measure：If belonging to first order of severity, after delay, wiretap is jumped into；If
Belong to second order of severity and then send corresponding warning；
Also include in the step S110：Error action of device during in order to prevent circuit interphase short circuit grounding fault, then gather three-phase electricity
Pressure, when line voltage imbalance, implement latch-up protection；Or increase action delay, escape maximum circuit actuation time；
1.5~2 times of out-of-balance current when the stalling current threshold value takes normal operation；
In the step S310, judge that the order of severity of busbar grounding failure belongs to first order of severity or second order of severity
It is specific to use：Compare ILWith ISetSize；If IL>ISet, then first order of severity is belonged to；
Wherein, ILFor arc suppression coil compensation electric current, ISetFor 0.5 times~0.9 times of system maximum capacitor electric current.
A kind of 4. bus protection relay system based on transient zero-sequence current feature, it is characterised in that including：
First acquisition unit, for obtaining the stalling current and difference current of all circuits in real time；
First comparing unit, for by the stalling current compared with stalling current threshold value set in advance：It is if described
When stalling current is more than stalling current threshold value, then after stalling current is multiplied by into ratio brake coefficient, compared with difference current
Compared with：If difference current is larger, it is determined as busbar grounding；
First protective unit, for after there is bus singlephase earth fault, judging that the order of severity of busbar grounding failure belongs to
First order of severity or second order of severity, and use corresponding measure：If belonging to first order of severity, after delay,
Jump into wiretap；Corresponding warning is sent if second order of severity is belonged to；
In the first acquisition unit, error action of device during in order to prevent circuit interphase short circuit grounding fault, then three-phase voltage is gathered,
When line voltage imbalance, implement latch-up protection；Or increase action delay, escape maximum circuit actuation time；
1.5~2 times of out-of-balance current when the stalling current threshold value takes normal operation；
In first protective unit, judge that the order of severity of busbar grounding failure belongs to first order of severity or second serious
Degree specifically uses：Compare ILWith ISetSize；If IL>ISet, then first order of severity is belonged to；
Wherein, ILFor arc suppression coil compensation electric current, ISetFor 0.5 times~0.9 times of system maximum capacitor electric current.
A kind of 5. bus protection relay system based on transient zero-sequence current feature, it is characterised in that including：
Second acquisition unit, the vector of the zero-sequence current for obtaining all circuits in real time；
Second comparing unit, for by the absolute value of the vector compared with threshold current set in advance：It is if described
The absolute value of vector is more than threshold current set in advance, then is determined as bus singlephase earth fault；
Second protective unit, for after there is bus singlephase earth fault, judging that the order of severity of busbar grounding failure belongs to
First order of severity or second order of severity, and use corresponding measure：If belonging to first order of severity, after delay,
Jump into wiretap；Corresponding warning is sent if second order of severity is belonged to；
The threshold current set in advance takes the absolute value of the vector of all circuit zero-sequence currents under normal operating condition
Numerical value between 1.5 times to 2 times；
In second protective unit, judge that the order of severity of busbar grounding failure belongs to first order of severity or second serious
Degree specifically uses：Compare ILWith ISetSize；If IL>ISet, then first order of severity is belonged to；
Wherein, ILFor arc suppression coil compensation electric current, ISetFor 0.5 times~0.9 times of system maximum capacitor electric current.
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