CN103728532A - Power distribution network single-phase grounding fault judging and locating method - Google Patents
Power distribution network single-phase grounding fault judging and locating method Download PDFInfo
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Abstract
The invention discloses a power distribution network single-phase grounding fault judging and locating method which mainly achieves accurate and quick judging of a fault section when a single-phase grounding fault occurs in a power distribution network. The power distribution network single-phase grounding fault judging and locating method comprises the following steps that a section switch is arranged on a circuit of the power distribution network, power distribution automation feeder line terminals are arranged on the section switch and network communication is established among the power distribution automation feeder line terminals; the power distribution automation feeder line terminals judge the circuit single-phase grounding fault and the s that a single-phase grounding fault point is located at a section adjacent to the section switch where the power distribution automation feeder line terminals are located. Compared with the prior art, the single-phase grounding fault is judged and detected through the power distribution automation feeder line terminals, network communication is established among all the power distribution automation feeder line terminals, fault judgment information is interacted among the power distribution automation feeder line terminals, the specific position of the fault point is determined, therefore, the fault region can be determined quickly, the fault processing time can be shortened and the power supply reliability can be improved.
Description
Technical field
The present invention relates to judgement and the localization method of a kind of determination methods of distribution network failure, particularly a kind of singlephase earth fault.
Background technology
10kV electrical power distribution automatization system (the power distribution network of China, system) major part is isolated neutral system or neutral by arc extinction coil grounding system, when there is singlephase earth fault, the electric current of trouble spot is very little, and it is symmetrical that the line voltage between three-phase still keeps, on not impact of the power supply of load, so rules regulation can continue to move 1～2 hour, and needn't trip immediately.After but singlephase earth fault occurs, perfecting phase voltage will raise
doubly, under individual cases, earthing capacitance current may cause that trouble spot electric arc leaps, the instantaneous superpotential that occurs, causes insulating breakdown, is further development of or multipoint earth faults at 2, so, find accurately and rapidly earth point fault, and fix a breakdown, significant to the safe operation of power distribution network.
The main stream approach that prior art is processed singlephase earth fault is first by line selection apparatus, to select faulty line, or by the method for " examination is drawn ", determine faulty line.Faulty line finds trouble spot by the method for line walking after determining.
For isolated neutral system and compensated distribution network, when there is singlephase earth fault, the feature showing is identical to some extent: isolated neutral system is when singlephase earth fault occurs, the zero-sequence current flowing through in fault element equals the non-fault element capacitive earth current of total system sum, the actual direction of capacitive character reactive power by line flows to bus, zero-sequence current in faulty line equals the capacitive earth current of itself, and the direction of capacitive character reactive power flows to circuit by bus.For compensated distribution network, due to the effect of arc suppression coil, greatly reduced the fault current of trouble spot, the in the situation that of over-compensation, the capacitive character reactive power direction of faulty line is also identical with non-fault line.
In addition, after judging faulty line, find rapidly trouble spot also particularly important.But distribution network line is intricate, some circuits reach tens kms; Some overhead transmission lines are crossed over mountain after mountain difficult in maintenance, and some all fronts are built on stilts, have plenty of cable aerial mixed line.Once overhead transmission line breaks down, search difficulty, particularly when circuit generation single-phase earthing, because trouble spot is difficult to determine, often incured loss through delay accident treatment opportunity, cause fault to expand, be further development of phase fault, or damage electrical equipment.
Summary of the invention
The object of this invention is to provide a kind of one-phase earthing failure in electric distribution network judgement and localization method, when the technical matters that solve is power distribution network generation singlephase earth fault, judge accurately, fast fault section.
The present invention is by the following technical solutions: a kind of one-phase earthing failure in electric distribution network judgement and localization method, comprise the following steps:
One, on the circuit of power distribution network, block switch is set, configures power distribution automation line feed terminals on each block switch, each power distribution automation line feed terminals is connected with the network switch by fiber optic Ethernet or EPON network, sets up network service each other;
Two, the data acquisition unit of power distribution automation line feed terminals, obtains the residual voltage 3U of this circuit
0with zero-sequence current 3I
0original signal, through analog/digital conversion, obtain digital quantity, the cpu data processing unit of power distribution automation line feed terminals carries out fourier algorithm calculating by digital quantity, calculates the residual voltage 3U of this circuit for isolated neutral system
0with zero-sequence current 3I
0vector, for neutral point, through arc suppression coil system-computed, go out zero sequence the 5th harmonic current 3I
05vector;
Three,, to described isolated neutral system, cpu data processing unit is used zero sequence steady-state quantity criterion to judge, by the mould 3I of zero-sequence current vector
0with zero sequence overcurrent protection definite value I
setcompare, cpu data processing unit is used the judgement of directional element criterion, relatively residual voltage 3U
0with zero-sequence current 3I
0phase place; Meet 3I simultaneously
0> I
set, zero-sequence current 3I
0hysteresis residual voltage 3U
090 °, judge that this circuit is singlephase earth fault; Described zero sequence overcurrent protection definite value I
set=k3I
0ik is safety coefficient, 1 < k≤2,3I
0ifor circuit zero-sequence current under normal circumstances;
To described neutral point, through arc suppression coil system, cpu data processing unit is used 5 subharmonic criterions to judge, by the mould 3I of zero sequence the 5th harmonic current vector
05with zero sequence the 5th harmonic current definite value I
set5 compare, and cpu data processing unit is to residual voltage 3U
0with zero-sequence current 3I
0use the judgement of transient criterion, head half wave phase of transient zero-sequence current and residual voltage on alternative route; 3I
05> I
set5, or transient zero-sequence current 3I
0with residual voltage 3U
0first half-wave single spin-echo, judge that this circuit is singlephase earth fault; Described zero sequence the 5th harmonic current definite value I
set5=k3I
05ik is safety coefficient, 1 < k≤2,3I
05ifor circuit zero sequence the 5th harmonic current under normal circumstances;
Four, each power distribution automation line feed terminals (FTU) judgement meets following localization of fault condition 1 or localization of fault condition 2, judge that Single-phase Ground Connection Failure is positioned at the block switch adjacent sections at this power distribution automation line feed terminals place, the circuit of block switch adjacent sections for being connected with this block switch;
Described localization of fault condition 1, this power distribution automation line feed terminals is judged singlephase earth fault, the mains side power distribution automation line feed terminals of this power distribution automation line feed terminals is judged singlephase earth fault or mains side without power distribution automation line feed terminals, the load side power distribution automation line feed terminals of this power distribution automation line feed terminals is not judged earth fault or load side without power distribution automation line feed terminals, and Single-phase Ground Connection Failure is positioned at the load side line that this block switch is connected;
Described localization of fault condition 2, this power distribution automation line feed terminals is not judged singlephase earth fault, and mains side power distribution automation line feed terminals is judged singlephase earth fault, and Single-phase Ground Connection Failure is positioned at the mains side circuit that this block switch is connected.
The circuit of the power distribution network of the inventive method is 10kV circuit.
The step 1 of the inventive method arranges block switch on a circuit of power distribution network.
The step 2 of the inventive method, centering point isolated neutral system meets the mould 3I of zero-sequence current vector simultaneously
0> zero sequence overcurrent protection definite value I
set, zero-sequence current 3I
0hysteresis residual voltage 3U
090 °, the duration is greater than 0.1-3 second, judges that this circuit is singlephase earth fault.
The step 2 of the inventive method, centering point is through arc suppression coil system, and the first half-wave single spin-echo duration of transient zero-sequence current and residual voltage is greater than 0.1-3 second, is judged as and meets transient criterion.
The step 2 of the inventive method, centering point is through arc suppression coil system, the mould 3I of zero sequence the 5th harmonic current vector
05> zero sequence the 5th harmonic current definite value I
set5, or meet transient criterion, the duration is greater than 0.1-3 second, judges that this circuit is singlephase earth fault.
The step 2 of the inventive method, centering point is through arc suppression coil system, and cpu data processing unit is by the residual voltage of circuit and zero-sequence current buffer memory 6 cycle sampled datas, as the residual voltage 3U of circuit
0effective value be greater than moment of 15V, record this current sampling point, then the zero-sequence current 3I of 6 cycles from current sampling point starts to search forward
0sampled data, finds zero-sequence current maximal value 3I
0maxsampled point, extract the sampled value residual voltage 3U at this place
0Nsam, compare 3I
0maxand 3U
0Nsamphase place, symbol is contrary, judges that earth fault has occurred this circuit.
The step 1 of the inventive method, the sampling number of every cycle of data acquisition unit is for being no less than 24 points.
The sampling number of every cycle of the data acquisition unit of the inventive method is 32.
The present invention compared with prior art, by each power distribution automation line feed terminals FTU judgement, detect singlephase earth fault, each power distribution automation line feed terminals FTU sets up network service each other, interaction fault judges information mutually, the particular location of the localization of faults, can determine fast fault zone, reduce fault handling time, improve power supply reliability.
Accompanying drawing explanation
Fig. 1 is isolated neutral system zero-sequence direction component schematic diagram.
Fig. 2 is isolated neutral system singlephase earth fault decision logic figure of the present invention.
Fig. 3 is " transient " of the present invention criterion schematic diagram.
Fig. 4 is compensated distribution network singlephase earth fault decision logic figure of the present invention.
Fig. 5 is singlephase earth fault of the present invention location schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.One-phase earthing failure in electric distribution network judgement of the present invention and localization method, adopt the power distribution automation line feed terminals FTU judgement singlephase earth fault of 10kV electrical power distribution automatization system, and by means of communication network, realize the location to singlephase earth fault.Communication network is fiber optic Ethernet or EPON network.
10kV power distribution network great majority are neutral point non-direct grounding system, when there is singlephase earth fault, zero-sequence current is less, compensated distribution network particularly, compensating action due to arc suppression coil, the more difficult seizure of zero-sequence current, so the steady-state quantity determination methods single by prior art can not accurately judge singlephase earth fault.Method of the present invention, for isolated neutral system, neutral by arc extinction coil grounding system, has proposed respectively singlephase earth fault judgement and localization method.
One, isolated neutral system singlephase earth fault determination methods
(1) ultimate principle
During isolated neutral system generation singlephase earth fault, fault signature is: the zero-sequence current of faulty line equals to remove outside faulty line, system-wide non-fault line element capacitive earth current sum; 90 ° of the zero-sequence current hysteresis residual voltages of faulty line, 90 ° of the leading residual voltages of zero-sequence current of non-fault line.So, centering point isolated neutral system, power distribution automation line feed terminals FTU adopts " zero sequence steady-state quantity "+" directional element " criterion judgement singlephase earth fault." zero sequence steady-state quantity " refers to when the zero-sequence current of circuit is greater than certain certain value, is judged as this circuit earth fault has occurred." directional element " refers to by the residual voltage of alternative route and the phase place of zero-sequence current and determines whether ground connection of circuit.
1, " zero sequence steady-state quantity " criterion
3I
0＞I
set（1）
Mould (actual measurement zero-sequence current) 3I when the zero-sequence current vector of circuit
0be greater than I
setduring definite value, be judged to be this circuit singlephase earth fault has occurred, wherein, I
setfor the zero sequence overcurrent protection definite value of this circuit, it is scalar value.
I
setadjust and need to meet following formula:
3I
0Σ-3I
0i≥I
set>3I
0i（2）
In formula (2), 3I
0 Σfor the zero-sequence current sum under normal circumstances of all circuits on bus under faulty line, 3I
0ifor faulty line zero-sequence current under normal circumstances, the left-hand component 3I of formula (2)
0 Σ-3I
0ifor the fault current of faulty line, I
setneed be less than or equal to the fault current of faulty line, and be greater than this circuit zero-sequence current under normal circumstances, be expressed as:
I
set=k·3I
0i（3）
In formula (3), k is safety coefficient, is taken as: 1 < k≤2.
2, " zero-sequence direction component (directional element) " criterion
Use zero-sequence direction component Do criterion to differentiate, zero-sequence direction component Do criterion is:
In formula (4), in bracket+10 ° ,-10 ° be maximum error scope, 3I
0for the zero-sequence current of circuit, 3U
0residual voltage for circuit.Meet the zero-sequence current 3I that formula (4) shows this circuit
0phase place hysteresis residual voltage 3U
090 °, there is singlephase earth fault in this circuit.
The active region of zero-sequence direction component Do positive dirction as shown in Figure 1.
For isolated neutral system, by " zero sequence steady-state quantity " and " directional element " two kinds of criterions, comprehensively judge singlephase earth fault, supplementing of " directional element " conduct " zero sequence steady-state quantity ", can be more perfect, judges more exactly singlephase earth fault.
(2) isolated neutral system singlephase earth fault determination methods, adopts following steps:
1, obtain the vector value that analog quantity calculates residual voltage and zero-sequence current
Obtain " zero sequence steady-state quantity " and the needed analog quantity information of " directional element " criterion, with data acquisition unit, i.e. the little transducer of voltage and current of power distribution automation line feed terminals FTU inside, obtains the residual voltage 3U of this circuit
0with zero-sequence current 3I
0original signal, through analog/digital conversion, analog input amount is converted to digital quantity, as instantaneous sampling value, cpu data processing unit (vector calculation module) by power distribution automation line feed terminals FTU carries out fourier algorithm calculating by the digital quantity of data acquisition unit output, calculates respectively the residual voltage 3U of this circuit
0with zero-sequence current 3I
0vector (vector value), computing formula is respectively as follows:
The sampling number of every cycle that in formula (5), formula (6), N is data acquisition unit, for being not less than 24 points (N>=24), N=32 in the present embodiment implementation procedure, 3Uor is the real part of vectorial 3Uo, and j is imaginary unit, and 3Uox is the imaginary part of vectorial 3Uo, 3U
o (m)be residual voltage at the instantaneous sampling value at sampled point m place, 3Ior is the real part of vectorial 3Io, 3Iox is the imaginary part of vectorial 3Io, 3I
o (m)that zero-sequence current is at the instantaneous sampling value at sampled point m place.
2, singlephase earth fault logic judgement
Cpu data processing unit is within each interrupt cycle, in conjunction with the residual voltage 3U obtaining in sampling calculating
0with zero-sequence current 3I
0vector value, carry out logic judgement.
As shown in Figure 2, before the judgement of isolated neutral system singlephase earth fault, first set following definite value code:
D018: little current zero sequence protection is thrown and moved back, and while dropping into little current zero sequence protection, singlephase earth fault arbitration functions drops into, and while exiting, does not carry out singlephase earth fault judgement.
D129: little current zero sequence directional element is thrown and moved back, while dropping into little current zero sequence directional element, " directional element " criterion starts, while exiting, without " directional element " criterion.
D008: little current zero sequence current ration, this definite value is the zero sequence overcurrent protection definite value I in " zero sequence steady-state quantity " criterion
set.
D009: limit value during little current zero sequence, meet singlephase earth fault criterion perdurability, be just considered to real singlephase earth fault, the time limit value of adjusting is 0.1-3 second.
Cpu data processing unit is used " zero sequence steady-state quantity " criterion to judge, by the mould of zero-sequence current vector (mould value) 3I
0with little current zero sequence current ration d008(zero sequence overcurrent protection definite value I
set) compare, as the mould 3I of zero-sequence current vector
0the little current zero sequence current ration of > d008(zero sequence overcurrent protection definite value I
set) time, record " zero sequence steady-state quantity " startup is masked as " 1 ", i.e. FLAG1=1; Work as 3I
0during the little current zero sequence current ration of < d008, record " zero sequence steady-state quantity " startup is masked as " 0 ", i.e. FLAG1=0.
Cpu data processing unit is to residual voltage 3U
0with zero-sequence current 3I
0use the judgement of " directional element " criterion, relatively residual voltage 3U
0with zero-sequence current 3I
0phase place, when meeting zero-sequence direction component Do criterion and being formula (4), shows the zero-sequence current 3I of this circuit
0phase place hysteresis residual voltage 3U
090 °, record " directional element " Do action is masked as " 1 ", i.e. FLAG2=1; As residual voltage 3U
0with zero-sequence current 3I
0when not meeting zero-sequence direction component Do criterion and being formula (4), record " directional element " Do action is masked as " 0 ", i.e. FLAG2=0.
At FLAG1 and FLAG2, be 1 o'clock simultaneously, and the duration be greater than 0.1-3 second during little current zero sequence during limit value d009, judge that this circuit is singlephase earth fault.
Two, neutral by arc extinction coil grounding system single-phase earth fault determination methods
Neutral by arc extinction coil grounding system, power distribution automation line feed terminals FTU adopts " 5 subharmonic "+" transient " criterion judgement singlephase earth fault.
(1) ultimate principle
1, " 5 subharmonic " criterion
In neutral by arc extinction coil grounding system, owing to having adopted the over-compensation of arc suppression coil at neutral point, faulty line zero-sequence current is very little, cannot adopt " zero sequence steady-state quantity " to judge.But compensated distribution network is after singlephase earth fault occurs, the 5th harmonic wave of each circuit (5 subharmonic) content increases very fast, and its distribution in electrical network is similar to the distribution of fundamental wave zero sequence electric current.During singlephase earth fault, the zero sequence 5 subharmonic current content of faulty line approximate removes the system-wide non-fault element zero sequence 5 subharmonic current sums of faulty line itself.As shown in Figure 3, for zero sequence 5 subharmonic of faulty line, because arc suppression coil induction reactance is: 5 ω L
k, system capacitive reactance is:
so, the capacitance current flowing out through non-fault line element in system is faradic 25 times of arc suppression coil, the not impact of zero sequence 5 subharmonic of the existence of arc suppression coil during almost on singlephase earth fault, so, for neutral by arc extinction coil grounding system, can adopt the judgement of zero sequence 5 subharmonic (5 subharmonic) criterion.5 subharmonic criterions are:
3I
05>I
set5（7）
Mould (actual measurement zero sequence the 5th harmonic current) 3I when zero sequence the 5th harmonic current vector of circuit
05> I
set5during definite value, be judged to be this circuit singlephase earth fault has occurred, wherein I
set5for zero sequence the 5th (zero sequence 5 times) harmonic current definite value of this circuit, it is scalar value.
I
set5adjusting of definite value needs to meet following formula:
3I
05Σ-3I
05i≥I
set5>3I
05i（8）
In formula (8), 3I
05 Σfor the zero sequence 5 subharmonic current sums under normal circumstances of all circuits on bus under faulty line, 3I
05ifor faulty line zero sequence 5 subharmonic currents under normal circumstances, the left-hand component 3I of formula (8)
05 Σ-3I
05izero sequence 5 subharmonic currents while being faulty line fault, I
set5zero sequence 5 subharmonic currents in the time of need being less than or equal to faulty line fault, and be greater than this circuit zero sequence 5 subharmonic currents under normal circumstances, be expressed as:
I
set5=k·3I
05i（9）
In formula (9), k is safety coefficient, is taken as: 1 < k≤2.
2, " transient " criterion
If do not meet formula (7), can also use the judgement of transient criterion.For neutral by arc extinction coil grounding system, the principle of " transient " criterion is: during neutral by arc extinction coil grounding system generation singlephase earth fault, and transient zero-sequence current 3I on faulty line
0with residual voltage 3U
0first half-wave single spin-echo, on non-fault line, transient zero-sequence current is identical with head half wave phase of residual voltage.
For neutral by arc extinction coil grounding system, by " 5 subharmonic " and " transient " two kinds of criterions, comprehensively judge singlephase earth fault, both supplement mutually, can be more perfect, judge more exactly singlephase earth fault.
(2) neutral point, through arc suppression coil system single-phase earth fault determination methods, adopts following steps:
1, obtain analog quantity information and be converted to digital quantity
(1) obtain the needed analog quantity information of " 5 subharmonic " criterion, with data acquisition unit, i.e. the little transducer of electric current of power distribution automation line feed terminals FTU inside, obtains the zero-sequence current 3I of this circuit
0original signal, through analog/digital conversion, analog input amount is converted to digital quantity, as instantaneous sampling value, cpu data processing unit (vector calculation module) by power distribution automation line feed terminals FTU carries out fourier algorithm calculating by the digital quantity of data acquisition unit output, calculates zero sequence 5 subharmonic current 3I
05vector (vector value), computing formula is as follows:
In formula (10), the sampling number of every cycle that N is data acquisition unit, for being not less than 24 points (N >=24), N=32 in the present embodiment implementation procedure.3Io5 is zero-sequence current 5 subharmonic vectors, 3I
o5rthe real part of vectorial 3Io5,3I
o5xbe the imaginary part of vectorial 3Io5, j is imaginary unit, 3I
o (m)for the instantaneous sampling value of zero-sequence current at sampled point m place.
(2), obtain the needed analog quantity of " transient " criterion, to residual voltage 3U
0with zero-sequence current 3I
0transient sampling, with data acquisition unit, i.e. the little transducer of voltage and current of power distribution automation line feed terminals FTU inside, obtains the residual voltage 3U of this circuit
0with zero-sequence current 3I
0original signal.Data acquisition unit is not less than the sampling rate of 24 by every cycle, the present embodiment, by every cycle 32 point samplings, through analog/digital conversion, is converted to digital quantity by analog input amount, as instantaneous sampling value.
As shown in Figure 3, for catching transient characterisitics, cpu data processing unit is by the residual voltage of circuit and zero-sequence current buffer memory 6 cycle sampled datas.Residual voltage 3U when this circuit
0effective value be greater than moment of 15V, record this current sampling point, then the zero-sequence current 3I of 6 cycles from current sampling point starts to search forward
0sampled data, finds zero-sequence current maximal value 3I
0maxsampled point, record zero-sequence current maximal value 3I
0maxthe sampled point counting Nsam of position, then extract 3U
0sampled value 3U at Nsam place
0Nsam, last, compare 3I
0maxand 3U
0Nsamsymbol (phase place), if symbol is contrary, one is positive number, one is negative, judges that earth fault has occurred this circuit; If symbol is identical, be positive number entirely or be negative entirely, judge that earth fault does not occur this circuit.
2, singlephase earth fault logic judgement
Cpu data processing unit, within each interrupt cycle, carries out the logic judgement of " 5 subharmonic " and " transient ".
As shown in Figure 4, before the judgement of neutral by arc extinction coil grounding system single-phase earth fault, first set following definite value code:
D500: zero sequence 5 subharmonic protections are thrown and moved back, and while dropping into zero sequence 5 subharmonic protection, " 5 subharmonic " criterion drops into, and while exiting, " 5 subharmonic " criterion exits.
D501: zero sequence transient based protection is thrown and moved back, while dropping into zero sequence transient based protection, " transient " criterion drops into, and while exiting, " transient " criterion exits.
D502: zero sequence 5 subharmonic definite values, this definite value is the zero sequence 5 subharmonic current definite value I in " 5 subharmonic " criterion
set5.
D503: zero-sequenceprotection time delay definite value, meet singlephase earth fault criterion perdurability, be just considered to real singlephase earth fault, singlephase earth fault criterion delayed setting is 0.1-3 second.
Cpu data processing unit is used " 5 subharmonic " criterion to judge, by the mould of zero sequence the 5th harmonic current vector (mould value) 3I
05with zero sequence 5 subharmonic definite value d502(zero sequence the 5th harmonic current definite value I
set5) compare, as the mould 3I of zero sequence the 5th harmonic current vector
05> zero sequence 5 subharmonic definite value d502(zero sequence the 5th harmonic current definite value I
set5) time, record " 5 subharmonic " startup is masked as " 1 ", i.e. FLAG1=1; Work as 3I
05during < d502 definite value, record " 5 subharmonic " startup is masked as " 0 ", i.e. FLAG1=0.
Cpu data processing unit is to residual voltage 3U
0with zero-sequence current 3I
0use the judgement of " transient " criterion, work as 3U
0and 3I
0meet " transient " criterion, i.e. transient zero-sequence current 3I
0with residual voltage 3U
0first half-wave single spin-echo, and duration while being greater than d503 time delay definite value, meet " transient " criterion, record " transient " action is masked as " 1 ", FLAG2=1, works as 3U
0and 3I
0while not meeting " transient " criterion, record " transient " action is masked as " 0 ", i.e. FLAG2=0.
When FLAG1 or FLAG2 equal 1, and duration while being greater than 0.1-3 zero-sequenceprotection second time delay definite value d503, judge that this circuit is singlephase earth fault.
Three, isolated neutral system and neutral by arc extinction coil grounding system single-phase earth fault location
(1) ultimate principle
On a 10kV circuit in power distribution network, be provided with a plurality of block switches, these block switches are divided into several sections by a 10kV circuit, on each block switch of a 10kV circuit, configure a station power distribution robotization line feed terminals FTU, each power distribution automation line feed terminals FTU is connected with the network switch by fiber optic Ethernet or EPON network, sets up the communication of network each other.
FTU gathers the residual voltage 3U of this block switch present position circuit
0with zero-sequence current 3I
0, for isolated neutral system, neutral by arc extinction coil grounding system, adopt different singlephase earth fault criterions, judge each block switch place whether singlephase earth fault has occurred.Each power distribution automation line feed terminals FTU by judged whether be the result of singlephase earth fault, with the transformer substation case GOOSE message format towards general object, send to other power distribution automation line feed terminals FTU in consolidated network, each power distribution automation line feed terminals FTU is according to the own singlephase earth fault judged result to present position, singlephase earth fault judged result in conjunction with other power distribution automation line feed terminals FTU obtaining from network, carry out comprehensive analysis and judgement, determine the particular location of Single-phase Ground Connection Failure.Like this, when a 10kV circuit generation singlephase earth fault, use method of the present invention, can not only know that singlephase earth fault has occurred which bar circuit, can also know Single-phase Ground Connection Failure is specifically positioned at which position of this circuit.
The GOOSE of each power distribution automation line feed terminals FTU opens into signal definition as table 1, and GOOSE outputs signal definition as table 2.
Table 1 GOOSE opens into signal
Table 2 GOOSE outputs signal
| GOOSE outputs empty terminal title | Remarks |
| This position ground signalling is outputed | This block switch place circuit whether output by ground signalling |
| Block signal is outputed | This block switch place block signal is outputed |
Described comprehensive analysis and judgement are: each power distribution automation line feed terminals FTU judgement meets following localization of fault condition 1 or localization of fault condition 2, judges that Single-phase Ground Connection Failure is positioned at the block switch adjacent sections at this power distribution automation line feed terminals place.The circuit of block switch adjacent sections for being connected with this block switch.
Localization of fault condition 1, this power distribution automation line feed terminals is judged (detecting) singlephase earth fault, the mains side power distribution automation line feed terminals of this power distribution automation line feed terminals is judged (detecting) singlephase earth fault or mains side without power distribution automation line feed terminals, the load side power distribution automation line feed terminals of this power distribution automation line feed terminals is not judged (detecting) earth fault or load side without power distribution automation line feed terminals, and Single-phase Ground Connection Failure is positioned at the load side line that this block switch is connected.
Localization of fault condition 2, this power distribution automation line feed terminals is not judged (detecting) singlephase earth fault, mains side power distribution automation line feed terminals is judged (detecting) singlephase earth fault, and Single-phase Ground Connection Failure is positioned at the mains side circuit that this block switch is connected.
(2) isolated neutral system and neutral by arc extinction coil grounding system single-phase earth fault location, adopt following steps:
1, configuration frame
As shown in Figure 5, a 10kV circuit of the A of transformer station of the present embodiment is connected through 5 block switch FD1, FD2, FD3, FD4, the B of FD5Yu transformer station, having formed " a handing in hand " circuit, is wherein off-state under block switch 3FD3 normal condition, is called again interconnection switch.5 block switches have configured respectively 5 station power distribution robotization line feed terminals FTU1, FTU2, FTU3, FTU4, FTU5, and each FTU gathers the line zero sequence voltage 3U of responsible block switch present position
0with zero-sequence current 3I
0.5 station power distribution robotization line feed terminals FTU are based upon in same network by fiber optic Ethernet, establish a communications link each other by the network switch.
2, singlephase earth fault judgement detects
5 station power distribution robotization line feed terminals FTU1, FTU2, FTU3, FTU4, FTU5 adopt different singlephase earth fault criterions for different neutral grounding modes, when being isolated neutral system, adopt " steady-state quantity "+" directional element " criterion, when being neutral by arc extinction coil grounding system, adopt " 5 subharmonic "+" transient " criterion, judge each block switch place whether singlephase earth fault has occurred.When singlephase earth fault has occurred at the block switch place that FTU judges place, the GOOSE of record " this position ground signalling is outputed " outputs signal for " 1 ", otherwise the GOOSE of record " this position ground signalling is outputed " outputs signal for " 0 ".
3, Single-phase Ground Connection Failure location
The GOOSE correlation signal definition of 5 station power distribution robotization line feed terminals FTU1, FTU2, FTU3, FTU4, FTU5 is as table 3.
Table 3 GOOSE correlation signal
When there is singlephase earth fault in the F1 place between FD2 and FD3, fault current is from ground connection flow through F1, FD2, the A of FD1Zhi transformer station, as shown in the camber line 1 in Fig. 5, be that block switch 1FD1, block switch 2FD2 all have fault current to flow through, it is 1 that the GOOSE of the FTU1 of responsible these two block switch fault detects outputs signal " this position ground signalling is outputed ", it is that to output signal " this position ground signalling is outputed " be 0 for the GOOSE of 1, FTU3, FTU4 and FTU5 that the GOOSE of FTU2 outputs signal " this position ground signalling is outputed ".The GOOSE correlation signal of listing according to table 3, for FTU2, its mains side " mains side ground signalling open into " is 1, because " FTU1: this position ground signalling is outputed " is 1, its load side " load side ground signalling is opened into 01 " is 0, because " FTU3: this position ground signalling is outputed " is 0, meet localization of fault condition 1, judge the sides adjacent that singlephase earth fault is positioned at FTU2: load side.And for other FTU, neither meet localization of fault condition 1, do not meet localization of fault condition 2, so singlephase earth fault is the block switch adjacent sections in other FTU not yet.
In the present embodiment, it is the vacuum circuit breaker of direct current 24V that 5 block switch FD1, FD2, FD3, FD4, FD5 adopt operating power, 5 station power distribution robotization line feed terminals FTU1, FTU2, FTU3, FTU4, FTU5 adopt the feed line automatization terminal that model is PRS-3351, it is direct current 24V, the industrial ethernet switch of supporting the communication of IEC61850 stipulations that the network switch adopts working power, adopts the Ver2.0 version program language of PRS-3351 to realize.
Whether the power distribution automation line feed terminals FTU by each block switch place of circuit, to block switch place circuit separately, singlephase earth fault has occurred judges detection, and pass through communication network, realize the information interaction between power distribution automation line feed terminals FTU and share, according to the principle mechanisms of singlephase earth fault location, the accurate location of finally having realized singlephase earth fault.
Method of the present invention is for 10kV isolated neutral with through the distribution network system of grounding through arc, for distribution network complicated and changeable, singlephase earth fault judgement detection method has been proposed, under every kind of method, by mutually supplementing of two kinds of criterions, realized more perfect fault judgement.Singlephase earth fault judgement accurately, then single-phase fault localization of fault principle and mechanism, effective detection and the accurate location of finally having realized one-phase earthing failure in electric distribution network.
The strong intelligent grid overall framework of construction China proposing according to State Grid Corporation of China; informationization, digitizing, robotization, interactive be the outstanding feature feature of Chinese intelligent grid; can predict; propelling along with intelligent power distribution network construction; the relay protection system of following intelligent distribution network is being inherited the mature technology while of the site protection based on local information; also by by means of development information-based, digitizing technique, to the protection system development of the function synthesized in the wide scope of mutual coordination.One-phase earthing failure in electric distribution network judgement of the present invention and localization method, significant to safeguarding reliability service, raising overhaul efficiency, the enhancing intelligent level of power distribution network.
Claims (9)
1. one-phase earthing failure in electric distribution network judges and a localization method, comprises the following steps:
One, on the circuit of power distribution network, block switch is set, on each block switch, configure power distribution automation line feed terminals (FTU), each power distribution automation line feed terminals (FTU) is connected with the network switch by fiber optic Ethernet or EPON network, sets up network service each other;
Two, the data acquisition unit of power distribution automation line feed terminals (FTU), obtain the original signal of residual voltage 3U0 and the zero-sequence current 3I0 of this circuit, through analog/digital conversion, obtain digital quantity, the cpu data processing unit of power distribution automation line feed terminals (FTU) carries out fourier algorithm calculating by digital quantity, calculates the residual voltage 3U of this circuit for isolated neutral system
0with zero-sequence current 3I
0vector, for neutral point, through arc suppression coil system-computed, go out zero sequence the 5th harmonic current 3I
05vector;
Three,, to described isolated neutral system, cpu data processing unit is used zero sequence steady-state quantity criterion to judge, by the mould 3I of zero-sequence current vector
0with zero sequence overcurrent protection definite value I
setcompare, cpu data processing unit is used the judgement of directional element criterion, relatively residual voltage 3U
0with zero-sequence current 3I
0phase place; Meet 3I simultaneously
0> I
set, zero-sequence current 3I
0hysteresis residual voltage 3U
090 °, judge that this circuit is singlephase earth fault; Described zero sequence overcurrent protection definite value I
set=k3I
0ik is safety coefficient, 1 < k≤2,3I
0ifor circuit zero-sequence current under normal circumstances;
To described neutral point, through arc suppression coil system, cpu data processing unit is used 5 subharmonic criterions to judge, by the mould 3I of zero sequence the 5th harmonic current vector
05with zero sequence the 5th harmonic current definite value I
set5compare, cpu data processing unit is to residual voltage 3U
0with zero-sequence current 3I
0use the judgement of transient criterion, head half wave phase of transient zero-sequence current and residual voltage on alternative route; 3I
05> I
set5, or transient zero-sequence current 3I
0with residual voltage 3U
0first half-wave single spin-echo, judge that this circuit is singlephase earth fault; Described zero sequence the 5th harmonic current definite value I
set5=k3I
05ik is safety coefficient, 1 < k≤2,3I
05ifor circuit zero sequence the 5th harmonic current under normal circumstances;
Four, each power distribution automation line feed terminals (FTU) judgement meets following localization of fault condition 1 or localization of fault condition 2, judge that Single-phase Ground Connection Failure is positioned at the block switch adjacent sections at this power distribution automation line feed terminals place, the circuit of block switch adjacent sections for being connected with this block switch;
Described localization of fault condition 1, this power distribution automation line feed terminals is judged singlephase earth fault, the mains side power distribution automation line feed terminals of this power distribution automation line feed terminals is judged singlephase earth fault or mains side without power distribution automation line feed terminals, the load side power distribution automation line feed terminals of this power distribution automation line feed terminals is not judged earth fault or load side without power distribution automation line feed terminals, and Single-phase Ground Connection Failure is positioned at the load side line that this block switch is connected;
Described localization of fault condition 2, this power distribution automation line feed terminals is not judged singlephase earth fault, and mains side power distribution automation line feed terminals is judged singlephase earth fault, and Single-phase Ground Connection Failure is positioned at the mains side circuit that this block switch is connected.
2. one-phase earthing failure in electric distribution network judgement according to claim 1 and localization method, is characterized in that: the circuit of described power distribution network is 10kV circuit.
3. one-phase earthing failure in electric distribution network judgement according to claim 2 and localization method, is characterized in that: described step 1 arranges block switch on a circuit of power distribution network.
4. one-phase earthing failure in electric distribution network according to claim 1 judgement and localization method, is characterized in that: described step 2, centering point isolated neutral system meets the mould 3I of zero-sequence current vector simultaneously
0> zero sequence overcurrent protection definite value I
set, zero-sequence current 3I
0hysteresis residual voltage 3U
090 °, the duration is greater than 0.1-3 second, judges that this circuit is singlephase earth fault.
5. one-phase earthing failure in electric distribution network according to claim 1 judges and localization method, it is characterized in that: described step 2, centering point is through arc suppression coil system, the first half-wave single spin-echo duration of transient zero-sequence current and residual voltage is greater than 0.1-3 second, is judged as and meets transient criterion.
6. one-phase earthing failure in electric distribution network according to claim 4 judgement and localization method, is characterized in that: described step 2, centering point is through arc suppression coil system, the mould 3I of zero sequence the 5th harmonic current vector
05> zero sequence the 5th harmonic current definite value I
set5, or meeting transient criterion, the duration is greater than 0.1-3 second, judges that this circuit is singlephase earth fault.
7. one-phase earthing failure in electric distribution network according to claim 1 judges and localization method, it is characterized in that: described step 2, centering point is through arc suppression coil system, and cpu data processing unit is by the residual voltage of circuit and zero-sequence current buffer memory 6 cycle sampled datas, as the residual voltage 3U of circuit
0effective value be greater than moment of 15V, record this current sampling point, then the zero-sequence current 3I0 sampled data of 6 cycles from current sampling point starts to search forward, finds zero-sequence current maximal value 3I
0maxsampled point, extract the sampled value residual voltage 3U at this place
0Nsam, compare 3I
0maxand 3U
0Nsamphase place, symbol is contrary, judges that earth fault has occurred this circuit.
8. one-phase earthing failure in electric distribution network judgement according to claim 1 and localization method, is characterized in that: described step 1, the sampling number of every cycle of data acquisition unit is for being no less than 24 points.
9. one-phase earthing failure in electric distribution network judgement according to claim 7 and localization method, is characterized in that: the sampling number of every cycle of described data acquisition unit is 32.
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