CN104280664A - Online insulation monitoring and line selecting method for resonant grounded system - Google Patents
Online insulation monitoring and line selecting method for resonant grounded system Download PDFInfo
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- CN104280664A CN104280664A CN201310277821.5A CN201310277821A CN104280664A CN 104280664 A CN104280664 A CN 104280664A CN 201310277821 A CN201310277821 A CN 201310277821A CN 104280664 A CN104280664 A CN 104280664A
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- arc suppression
- residual voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses an online insulation monitoring and line selecting method for a resonant grounded system. By means of the method, insulation parameters of all feeder lines can be precisely measured online, and the sensitivity of judging single-phase earth faults is improved; when a power grid has the single-phase earth faults, fault lines are found out through changes of the insulation parameters of the feeder lines; under a full-compensation state of an arc suppression coil, whether the faults are eliminated can be judged by monitoring the insulation parameters of the feeder lines. The method eliminates the influence of the asymmetry degree of parameters of the power grid on measurement of the insulation parameters of the feeder lines, eliminates the influence of transition resistance on fault phase selection, eliminates the influence of resonance overvoltage of the arc suppression coil on the judgment of whether the faults are automatically eliminated, and solves the technical problems of power grid insulation monitoring, fault line selection, fault recovery judgment and the like. The realizing mode is simple, precision is high, and normal operation of the system is not affected.
Description
Technical field
What the present invention relates to is a kind of measurement and control method of electrical technology, and specifically resonant earthed system feeder line insulation parameter measures the technology with faulty line identification.
Background technology
Because arc suppression coil can produce inductance current, greatly reduce the capacitance current of earth fault, play the effect extinguishing ground arc, this is conducive to the self-recoverage of fault phase, thus electrical network still sustainable power supply after generation singlephase earth fault, improves power distribution network reliability of operation.In order to improve the compensation precision of capacitance current, arc suppression coil needs the insulation parameter measuring electrical network in real time to meet the requirement of tracing compensation.But arc suppression coil can only measure power network line total capacitance and the total conductance of insulation, and the insulation parameter for feeder line is helpless.
Need increase ratio of damping or tuning-off degree to reduce neutral point displacement voltage when resonant earthed system is normally run, when arc suppression coil after electric network fault need be adjusted to full compensating coefficient immediately, neutral point voltage is now higher.Part singlephase earth fault is only had to be permanent earth fault in reality, when after fault phase self-recoverage, due to power network line over the ground parameter self still there is resonance overvoltage under there is the full compensating coefficient of uneven arc suppression coil, electrical network degree of asymmetry larger zero sequence resonance overvoltage is larger, and now whether arc suppression coil tracing compensation equipment None-identified fault is eliminated.Thus a kind of method finding identifiable design fault whether to eliminate is needed.
Introducing causing trouble line zero-sequence current feature due to arc suppression coil becomes complicated, thus has scholar to propose the selection method of zero sequence real component.But real component method is based upon on the basis of power network line parameter Striking symmetry, and in reality, the electrical network of power network line parameter Striking symmetry exists hardly.The real component of ground current is relatively little, has larger dependence to the precision of measuring equipment, and particularly when electrical network generation high resistance ground, the precision of the less the method for ground current also will reduce greatly.
Because singlephase earth fault accounts for more than 80% of electric network fault, the in-service monitoring and the raising route selection precision that therefore realize line insulation parameter are significant for the safe operation of electrical network.
Summary of the invention
Technical matters: technical matters to be solved by this invention is to provide the online insulation monitoring of a kind of resonant earthed system and selection method, the insulation parameter of each feeder line accurately can be measured when electrical network normally runs, when finding out faulty line by the change of feeder line insulation parameter after electrical network generation singlephase earth fault, whether certainly eliminated by monitoring feeder line insulation parameter failure judgement after fault.The method need eliminate the impact on insulating monitoring and route selection precision of power network line parameter unbalance and transition resistance.
Technical scheme: for solving with above-mentioned technical matters, the present invention proposes the online insulation monitoring of a kind of resonant earthed system and selection method; Regulate arc suppression coil parameter when electrical network normally runs, measure and record the zero-sequence current adjusting electrical network zero sequence electricity and all feeder lines before and after ginseng, calculating the insulation parameter of each feeder line according to the residual voltage recorded and feeder line zero-sequence current data; The zero-sequence current of electrical network residual voltage and each feeder line is again measured after electric network fault arc suppression coil is adjusted to full compensating coefficient, again calculate the insulation parameter of each feeder line according to the residual voltage before and after fault and feeder line zero sequence current signal, then the feeder line of insulation parameter change is fault wire; Continue after fault to monitor residual voltage, if residual voltage changes, remeasure residual voltage and each feeder line zero-sequence current, each feeder line insulation parameter is recalculated with the residual voltage remeasured and feeder line zero sequence current signal according to before fault, if each feeder line parameter of calculating and consistent before fault, then judge Failure elimination, arc suppression coil exits full compensating coefficient, and concrete steps are as follows.
Step a: when electrical network normally runs, regulates the parameter of arc suppression coil, measures and records the zero-sequence current adjusting electrical network residual voltage and all feeder lines before and after ginseng, and the residual voltage before note regulates arc suppression coil parameter is
, each feeder line zero-sequence current be
, the residual voltage after note regulates arc suppression coil is
, each feeder line zero-sequence current be
, for the electrical network having n bar feeder line, subscript
(i=1.2 ... n), measurement data is preserved;
The tune ginseng form of above-mentioned adjustment arc suppression coil is unrestricted, as long as arc suppression coil branch impedance changes, comprise following situation: post-set arc suppression coils is regulated equivalent inductance, changed for the adjustable equivalent inductance of preset arc suppression coil or equivalent damping or both resistance sense parameters simultaneously.
Step b: the insulation parameter calculating each feeder line according to measurement data in step a
, as follows:
formula 1
In formula 1
c ifor electrical network i-th feeder line distributes total capacitance over the ground,
g ifor electrical network i-th feeder line distributes total conductance over the ground, the insulating monitoring of electrical network feeder line can be realized by formula 1; Preserve result of calculation.
Step c: monitoring electrical network residual voltage, and repeated execution of steps a and step b, realize the on-line monitoring of line insulation; If the insulation parameter of certain feeder line
the real part displacement degree that becomes large (insulation resistance diminishes) or residual voltage exceed a certain setting value, this setting value is generally below 15% phase voltage, then enter steps d.
Steps d: during generation singlephase earth fault, arc suppression coil need be adjusted to full compensating coefficient immediately, and arc suppression coil measures the zero-sequence current of electrical network residual voltage and all feeder lines again after being adjusted to full compensating coefficient, the residual voltage under the full compensating coefficient of note arc suppression coil is
, each feeder line zero-sequence current be
, preserve measurement data.
Step e: the insulation parameter again calculating each feeder line according to the data measured in step a and steps d
, as follows:
formula 2
Feeder line insulation parameter failure judgement line by comparison expression 1 and formula 2 calculate: if
, then there is not earth fault in i-th feeder line; If
, then i-th feeder line generation earth fault; For the electrical network having n bar feeder line, i=1.2 ... n; Preserve result of calculation.
Step f: after fault occurs, arc suppression coil is adjusted to full compensating coefficient, continues to monitor residual voltage, if residual voltage change, remeasures the zero-sequence current of electrical network residual voltage and all feeder lines, and note residual voltage is now
, each feeder line zero-sequence current be
, preserve measurement data according to.
Step g: the insulation parameter again calculating each feeder line according to the data measured in step a and step f
, as follows:
formula 3
Whether comparison expression 1 is eliminated with the calculated value failure judgement of formula 2: if for i-th feeder line, i=1.2 ... n,
, then fault is not eliminated, and this feeder fault, now arc suppression coil keeps full compensating coefficient, and is back to step f; If for i-th feeder line, i=1.2 ... n, has
, then Failure elimination, arc suppression coil exits full compensating coefficient, enters step g; Preserve result of calculation.
Step g: after eliminating fault, repeat from step a.
Beneficial effect: the online insulation monitoring of a kind of resonant earthed system that the present invention proposes and selection method, the present invention accurately can measure the insulation parameter of each feeder line online, improves the sensitivity that singlephase earth fault judges; When after electrical network generation singlephase earth fault, find out faulty line by the change of feeder line insulation parameter; Under the full compensating coefficient of arc suppression coil, can failure judgement whether be eliminated by monitoring feeder line insulation parameter.This method eliminates the impact that electrical network parameter degree of asymmetry is measured feeder line insulation parameter, eliminate the impact that transition resistance is selected fault phase, eliminate the impact whether arc suppression coil resonance overvoltage is eliminated Judging fault, solve the technical barriers such as line insulation monitoring, failure line selection and fault recovery differentiation.Implementation is simple, and precision is high.Influential system does not normally run.
Accompanying drawing illustrates:
Fig. 1 resonant earthed system singlephase earth fault equivalent schematic diagram;
The online insulation monitoring of Fig. 2 resonant earthed system and selection method control flow chart.
Embodiment
For making technological means of the invention process, creation characteristic, technical scheme and advantage and effect clearly understand, below in conjunction with the accompanying drawing in the embodiment of the present invention, give detailed embodiment and specific operation process.Fig. 1 is resonant earthed system singlephase earth fault equivalent schematic diagram, and this electrical network has n bar feeder line, and i-th feeder line occurs single-phase through conductance
g eearth fault, this neutral point of electric network through grounding through arc, in figure
lfor arc suppression coil equivalent inductance,
g lfor equivalent parallel conductance, for post-set arc suppression coils
g l=0, remember this power network line parameter unbalance over the ground.Enforcement of the present invention directly can obtain electrical network bus residual voltage signal from PT secondary side, obtains feeder line zero sequence current signal, introduce concrete implementation step in detail below as follows according to Fig. 2 from the zero sequence current mutual inductor of each feeder line.
Step 1: when electrical network normally runs, regulates the parameter of arc suppression coil, measures and records the zero-sequence current adjusting electrical network residual voltage and all feeder lines before and after ginseng, and the residual voltage before note regulates arc suppression coil parameter is
, each feeder line zero-sequence current be
, the residual voltage after note regulates arc suppression coil is
, each feeder line zero-sequence current be
, for the electrical network having n bar feeder line, subscript
(i=1.2 ... n), measurement data is preserved;
formula 4
formula 5
In formula:
=j
ω C a+
g a+
a 2(j
ω C b+
g b)+
a(j
ω C c+
g c) be power network line parameter unbalance vector, wherein
a=e
120 °,
c a,
c bwith
c cfor electrical network three relatively distributes total capacitance;
g a,
g bwith
g cfor electrical network three relatively distributes total conductance;
c Σ=
c a+
c b+
c cfor system total distributed capacitance;
g Σ=
g a+
g b+
g cfor system distributes total conductance; j
ω L 1+
g l1for adjusting the arc suppression coil branch admittance before ginseng, j
ω L 2+
g l2for adjusting the arc suppression coil branch admittance after ginseng, both are unequal;
The tune ginseng form of above-mentioned adjustment arc suppression coil is unrestricted, as long as arc suppression coil branch impedance changes, comprise following situation: post-set arc suppression coils is regulated equivalent inductance, changed for the adjustable equivalent inductance of preset arc suppression coil or equivalent damping or both resistance sense parameters simultaneously.
Article i-th, the natural unbalance voltage of feeder line is:
formula 6
In formula:
=j
ω C ai+
g ai+
a 2(j
ω C bi+
g bi)+
a(j
ω C ci+
g ci) be i-th feeder line parameter unbalance vector, wherein
a=e
120 °,
c ai,
c biwith
c ciit is i-th feeder line three relatively distributed capacitance;
g ai,
g biwith
g cibe that i-th feeder line three relatively distributes conductance;
c i=
c ai+
c bi+
c cibe i-th feeder line distribution total capacitance;
g i=
g ai+
g bi+
g cibe that i-th feeder line distributes total conductance.
Step 2: the insulation parameter calculating each feeder line according to measurement data in step 1, has when electrical network normally runs:
formula 7
formula 8
Solution formula 7 and formula 8 obtain:
formula 9
In formula
c ifor electrical network i-th feeder line distributes total capacitance over the ground,
g ifor electrical network i-th feeder line distributes total conductance over the ground, the insulating monitoring of electrical network feeder line can be realized by formula 9; Preserve result of calculation.
Step 3: monitoring electrical network residual voltage, and repeated execution of steps 1 and step 2, realize the on-line monitoring of line insulation; If the displacement degree that the real part of the insulation parameter of certain feeder line becomes large (insulation resistance diminishes) or residual voltage exceeds a certain setting value, this setting value is generally below 15% phase voltage, then enter step 4.
Step 4: during generation singlephase earth fault, arc suppression coil need be adjusted to full compensating coefficient immediately, and arc suppression coil measures the zero-sequence current of electrical network residual voltage and all feeder lines again after being adjusted to full compensating coefficient, the residual voltage under the full compensating coefficient of note arc suppression coil is
, each feeder line zero-sequence current be
, preserve measurement data.After electric network fault, under the full compensating coefficient of arc suppression coil, electrical network residual voltage is:
formula 10
In formula
for fault phase electrical source voltage,
g efor transition conductance.
Step 5: the insulation parameter again calculating each feeder line according to the data measured in step 1 and step 4
:
If i-th the non-fault of feeder line:
formula 11
If i-th feeder fault:
formula 12
In formula 12:
formula 13
According to the data measured in step 1 and step 4 and formula 10 ~ formula 13, again calculate the insulation parameter of each feeder line
:
formula 14
Feeder line insulation parameter failure judgement line by comparison expression 8 and formula 14 calculate: if
, then there is not earth fault in i-th feeder line; If
, then i-th feeder line generation earth fault; For the electrical network having n bar feeder line, i=1.2 ... n; Preserve result of calculation.
Step 6: after fault occurs, arc suppression coil is adjusted to full compensating coefficient, continues to monitor residual voltage, if residual voltage change, remeasures the zero-sequence current of electrical network residual voltage and all feeder lines, and note residual voltage is now
, each feeder line zero-sequence current be
, preserve measurement data according to;
Under the full compensating coefficient of arc suppression coil, the residual voltage of fault after eliminating is:
formula 15
From above formula, when electrical network degree of asymmetry is higher, because the resonance overvoltage entirely compensated is higher, whether system is difficult to failure judgement and eliminates.
Step 7: the insulation parameter again calculating each feeder line according to the data measured in step 1 and step 6
, as follows:
formula 16
Whether comparison expression 8 is eliminated with the calculated value failure judgement of formula 16: if for i-th feeder line, i=1.2 ... n,
, then fault is not eliminated, and this feeder fault, now arc suppression coil keeps full compensating coefficient, and is back to step 6; If for i-th feeder line, i=1.2 ... n, has
, then Failure elimination, arc suppression coil exits full compensating coefficient, enters step 8; Preserve result of calculation.
Step 8: after eliminating fault, repeat from step a.
Claims (1)
1. the online insulation monitoring of resonant earthed system and selection method, it is characterized in that, arc suppression coil parameter is regulated when electrical network normally runs, measure and record the zero-sequence current adjusting electrical network zero sequence electricity and all feeder lines before and after ginseng, calculating the insulation parameter of each feeder line according to the residual voltage recorded and feeder line zero-sequence current data; Work as electric network fault, arc suppression coil measures the zero-sequence current of electrical network residual voltage and each feeder line again after being adjusted to full compensating coefficient, again calculate the insulation parameter of each feeder line according to the residual voltage before and after fault and feeder line zero sequence current signal, then the feeder line of insulation parameter change is fault wire; Continue after fault to monitor residual voltage, if residual voltage changes, remeasure residual voltage and each feeder line zero-sequence current, each feeder line insulation parameter is recalculated with the residual voltage remeasured and feeder line zero sequence current signal according to before fault, if each feeder line parameter of calculating and consistent before fault, then judge Failure elimination, arc suppression coil exits full compensating coefficient, and concrete steps are as follows:
Step a: when electrical network normally runs, regulates the parameter of arc suppression coil, measures and records the zero-sequence current adjusting electrical network residual voltage and all feeder lines before and after ginseng, and the residual voltage before note regulates arc suppression coil parameter is
, each feeder line zero-sequence current be
, the residual voltage after note regulates arc suppression coil is
, each feeder line zero-sequence current be
, for the electrical network having n bar feeder line, subscript
(i=1.2 ... n), measurement data is preserved;
The tune ginseng form of above-mentioned adjustment arc suppression coil is unrestricted, as long as arc suppression coil branch impedance changes, comprise following situation: post-set arc suppression coils is regulated equivalent inductance, changed for the adjustable equivalent inductance of preset arc suppression coil or equivalent damping or both resistance sense parameters simultaneously;
Step b: the insulation parameter calculating each feeder line according to measurement data in step a
, as follows:
formula 1
In formula 1
c ifor electrical network i-th feeder line distributes total capacitance over the ground,
g ifor electrical network i-th feeder line distributes total conductance over the ground, the insulating monitoring of electrical network feeder line can be realized by formula 1; Preserve result of calculation;
Step c: monitoring electrical network residual voltage, and repeated execution of steps a and step b, realize the on-line monitoring of line insulation; If the displacement degree that the real part of the insulation parameter of certain feeder line becomes large (insulation resistance diminishes) or residual voltage exceeds a certain setting value, this setting value is generally below 15% phase voltage, then enter steps d;
Steps d: during generation singlephase earth fault, arc suppression coil need be adjusted to full compensating coefficient immediately, and arc suppression coil measures the zero-sequence current of electrical network residual voltage and all feeder lines again after being adjusted to full compensating coefficient, the residual voltage under the full compensating coefficient of note arc suppression coil is
, each feeder line zero-sequence current be
, preserve measurement data;
Step e: the insulation parameter again calculating each feeder line according to the data measured in step a and steps d
, as follows:
formula 2
Feeder line insulation parameter failure judgement line by comparison expression 1 and formula 2 calculate: if
, then there is not earth fault in i-th feeder line; If
, then i-th feeder line generation earth fault; For the electrical network having n bar feeder line, i=1.2 ... n; Preserve result of calculation;
Step f: after fault occurs, arc suppression coil is adjusted to full compensating coefficient, continues to monitor residual voltage, if residual voltage change, remeasures the zero-sequence current of electrical network residual voltage and all feeder lines, and note residual voltage is now
, each feeder line zero-sequence current be
, preserve measurement data according to;
Step g: the insulation parameter again calculating each feeder line according to the data measured in step a and step f
, as follows:
formula 3
Whether comparison expression 1 is eliminated with the calculated value failure judgement of formula 2: if for i-th feeder line, i=1.2 ... n,
, barrier is not eliminated, and this feeder fault, now arc suppression coil keeps full compensating coefficient, and is back to step f; If for i-th feeder line, i=1.2 ... n, has
, then Failure elimination, arc suppression coil exits full compensating coefficient, enters step g; Preserve result of calculation;
Step g: after eliminating fault, repeat from step a.
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| CN108448562A (en) * | 2018-05-25 | 2018-08-24 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation method of electric current based on singlephase earth fault and system |
| CN108983055A (en) * | 2018-08-13 | 2018-12-11 | 西安科技大学 | A kind of power distribution network cable run insulation state monitoring method and device |
| CN109980624A (en) * | 2019-04-02 | 2019-07-05 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil |
| CN110927517A (en) * | 2019-11-14 | 2020-03-27 | 长沙理工大学 | Method and system for measuring ground insulation parameters of neutral point ungrounded distribution network by using star-shaped capacitor |
| CN111103501A (en) * | 2018-10-09 | 2020-05-05 | 长沙理工大学 | Method and system for measuring ground insulation parameters of ungrounded neutral point power distribution network |
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| CN111103499A (en) * | 2018-10-09 | 2020-05-05 | 长沙理工大学 | Method for measuring ground parameters of power distribution network grounded through arc suppression coil series resistor |
| CN112260249A (en) * | 2020-10-21 | 2021-01-22 | 西安工程大学 | Flexible arc extinction method for single-phase earth fault of power distribution network |
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| CN108448562A (en) * | 2018-05-25 | 2018-08-24 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation method of electric current based on singlephase earth fault and system |
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| CN108983055B (en) * | 2018-08-13 | 2020-10-13 | 西安科技大学 | Method and device for monitoring insulation state of cable line of power distribution network |
| CN111103501B (en) * | 2018-10-09 | 2022-05-20 | 长沙精科电力技术有限公司 | Method and system for measuring ground insulation parameters of ungrounded neutral point power distribution network |
| CN111103501A (en) * | 2018-10-09 | 2020-05-05 | 长沙理工大学 | Method and system for measuring ground insulation parameters of ungrounded neutral point power distribution network |
| CN111103500A (en) * | 2018-10-09 | 2020-05-05 | 长沙理工大学 | Resonance grounding power distribution network ground parameter measurement method considering damping resistance |
| CN111103499A (en) * | 2018-10-09 | 2020-05-05 | 长沙理工大学 | Method for measuring ground parameters of power distribution network grounded through arc suppression coil series resistor |
| CN109980624A (en) * | 2019-04-02 | 2019-07-05 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil |
| CN109980624B (en) * | 2019-04-02 | 2020-11-17 | 云南电网有限责任公司电力科学研究院 | Full compensation implementation method for matching controllable current source with pre-adjusted arc suppression coil |
| CN110927517A (en) * | 2019-11-14 | 2020-03-27 | 长沙理工大学 | Method and system for measuring ground insulation parameters of neutral point ungrounded distribution network by using star-shaped capacitor |
| CN110927517B (en) * | 2019-11-14 | 2022-01-25 | 长沙理工大学 | Method and system for measuring ground insulation parameters of neutral point ungrounded distribution network by using star-shaped capacitor |
| CN112260249A (en) * | 2020-10-21 | 2021-01-22 | 西安工程大学 | Flexible arc extinction method for single-phase earth fault of power distribution network |
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