CN109917227A - Power distribution network single-phase disconnection fault identification method based on phase relation - Google Patents
Power distribution network single-phase disconnection fault identification method based on phase relation Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/08—Locating faults in cables, transmission lines, or networks
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Abstract
The present invention, which mainly discloses, a kind of synchronizes measurement to the three-phase voltage to fault down stream load-side using Wide Area Measurement System, and calculating analysis is carried out to the phase relation of load-side three-phase voltage, obtain a kind of single-phase wire break fault identification method based on three-phase voltage vector angle relationship.Relative to traditional discrimination method, analytical calculation has been carried out to source side, the load-side equivalent-circuit model under different Groundings, different ground connection transition resistance resistance values herein, the fault identification method obtained has preferable identification precision and the wide scope of application, proposes a kind of feasible effective new departure to solve power distribution network single-phase disconnection fault identification problem.
Description
Technical field
The present invention relates to distribution network line fault discrimination method, specifically a kind of power distribution network based on phase relation is single-phase disconnected
Line fault identification method.
Background technique
Power distribution network is connected directly with user, is the important component of electric system, the electricity consumption of operating status and user
Quality and personal safety are directly related.After power distribution network single-phase disconnection failure occurs, fault down stream load-side three-phase voltage occurs bright
Aobvious energy imbalance leads to the three-phases power-equipment phase-deficient operation such as motor, finally burns because of fever, cause serious warp
Ji loss；While ground fault is often accompanied by when the generation of single-phase wire break failure, in this complex grounding fault with interruption and power distribution network
Common singlephase earth fault is different, it is most likely that leads to the safety accidents such as people and animals get an electric shock, mountain forest is caught fire, has very high danger
Property, grave danger is caused safely to the people's lives and property.
Although utilizing the voltage of single-phase wire break failure, electric current spy currently, being absorbed in power distribution network there are many scholar
Sign carries out fault identification, if Shandong University scholar is under study for action to the three-phase of the single-phase wire break failure under three kinds of different Groundings
Sequence voltage, sequence electric current have carried out more detailed analysis, propose using positive and negative sequence electric current and its variable quantity as single-phase wire break event
Hinder the criterion of identification, but deficiency is considered to the Standard resistance range of ground connection transition resistance, practical identification effect is undesirable.
China in a manner of small current neutral grounding based on power distribution network in, since single-phase wire break failure and singlephase earth fault exist
The electric characteristic of source side is quite similar, is difficult to carry out fault identification with traditional centralized measuring device, power distribution network is single-phase
Disconnection fault may continue to remain operational a few hours after occurring, and seriously threaten the safe and reliable operation of distribution.Although single-phase wire break
Failure and singlephase earth fault have the source side electric characteristic for being difficult to differentiate, but both failures but have not in load-side
Same voltage characteristic.According to this feature, for the fault message for obtaining load fault side, based on wide-area monitoring systems (WAMS,
Wide Area Measurement System) distributed measurement is carried out to power distribution network, and fault identification is carried out on this basis.
WAMS provides accurate markers by global positioning system, obtains high sampling rate, high-precision electric current, voltage and frequency
Signal obtains, the characteristic of synchronous acquisition and generating date with phasor, can be widely used for the whole network operational monitoring control,
Locality protection control, the every field such as fault diagnosis and pollution sources positioning.
WAMS uses synchronous phase angle measuring technique, and phasor measurement unit PMU is arranged in the crucial monitoring point of power grid, realizes
To the synchronous acquisition of the whole network phasor.PMU is by the synchronous clock synchronization of GPS technology, and target information is sent to master station when will have, and adjusts
Degree personnel monitor the operating status of power grid in real time according to synchronizing information.WAMS system is widely used in POWER SYSTEM STATE and estimates
Meter, power grid transient state and the multiple high grades operation such as stable state control, relay protection and automation control, fault diagnosis and fault location divide
Among analysis.Before and after foreign countries start from nineteen ninety for the research of WAMS, the country such as the U.S., Spain is successively for WAMS system
Synchronous measure, field application etc. are studied；China starts from 2000 for WAMS systematic research, Research Emphasis
Pay close attention to the design and use of phasor measurement unit.
On the basis of WAMS, detection point can be carried out to fault down stream load side voltage by distributed measurement device
Analysis, and fault identification is carried out to single-phase wire break failure on this basis, to solve single-phase wire break fault identification in current power distribution network
Difficult problem.
Summary of the invention
Present invention aims to overcome that above-mentioned the deficiencies in the prior art, provide the power distribution network based on three-phase voltage phase relation
Single-phase wire break fault identification method, by synchronizing survey using three-phase voltage of the Wide Area Measurement System to fault down stream load-side
Amount, and calculating analysis is carried out to the phase relation of load-side three-phase voltage, it is distinguished with solving single-phase wire break failure in current power distribution network
Know difficult problem.
Technical solution of the invention is as follows:
A kind of power distribution network single-phase disconnection fault identification method based on distributed measurement, this approach includes the following steps
Step S1: monitoring power distribution network on-line using Wide Area Measurement System, when monitoring failure, then by described wide
The voltage and current data that domain measurement system acquisition arrives carry out section positioning to failure according to D type traveling wave localization method, and utilize
Symmetrical component method obtains positive sequence, negative phase-sequence, residual voltage, current data；
Whether step S2: being single-phase according to singlephase earth fault and the boundary condition principium identification failure of single-phase wire break failure
Ground fault or single-phase wire break failure.If it is singlephase earth fault or single-phase wire break failure, then S3 is entered step；If not
Singlephase earth fault or single-phase wire break failure, then determining failure not is single-phase wire break failure, terminates fault identification；
Step S3: A, B, C three-phase of measuring device in the trouble point downstream Wide Area Measurement System of synchronous acquisition failure t moment
Voltage data, and store；
Step S4: defining C phase is failure phase, and A, B, C three-phase voltage data of storage are crossed to Fourier transformation all and obtained
A, B, C three-phase voltage vector UAL、UBL、UCL；Then calculate UCLWith (UAL+UBL) angle value θ, formula is as follows:
Step S5: fault identification is carried out based on angle value θ: when | θ | at >=90 °, it is determined as singlephase earth fault；When | θ | <
At 90 °, then it is determined as single-phase wire break failure.
Relative to traditional discrimination method, the present invention is to the power supply under different Groundings, different ground connection transition resistance resistance values
Side, load-side equivalent-circuit model have carried out analytical calculation, the fault identification method obtained have preferable identification precision with
The wide scope of application proposes a kind of feasible effective new departure to solve power distribution network single-phase disconnection fault identification problem.
Detailed description of the invention
Fig. 1 is Y-Y type transformer equivalent circuit figure
Fig. 2 is Δ-Y type transformer equivalent circuit figure
Fig. 3 is singlephase earth fault load side voltage vectogram
Fig. 4 single-phase wire break load fault side voltage vector diagram
Fig. 5 distribution network simulation topology diagram
θ-R0 the relational graph of Fig. 6 simulated fault
Specific embodiment
With reference to the accompanying drawing, presently preferred embodiments of the present invention is provided, and is described in detail, but this hair should not be limited with this
Bright protection scope.
Common distribution transformer has Y-Y type and two kinds of modes of connection of Δ-Y type, for Y-Y type transformer, equivalent electricity
Road is as shown in Figure 1.Wherein UIA、UIB、UICRespectively three-phase input voltage of A, B, C three-phase line to transformer；CA、CB、CCPoint
Not Wei three-phase line distribution capacity over the ground；ZA、ZB、ZCThe respectively three-phase windings of transformer；R0To be grounded transition resistance.
Due to distribution line distribution capacity C over the groundA、CB、CCVery little, converts to obtain impedance and is far longer than according to formula 1/jwC
Three-Phase Transformer impedance ZA、ZB、ZCWith ground connection transition resistance R0, therefore transformer equivalent circuit is counted in this case
It can ignore when calculation by CA、CBThe electric current for flowing into the earth, is regarded as open circuit；And R0With CCParallel impedance value can be considered as
R0.Assume that Three-Phase Transformer winding is symmetrical simultaneously, i.e. three-phase windings resistance value ZA=ZB=ZC=Z1。
It for disconnection fault, is calculated with Fig. 2 circuit, obtains Y-Y type transformer C phase primary side voltage value UCL:
Then similar analytical calculation is carried out to Δ-Y type transformer (its equivalent circuit is as shown in Figure 2).U in figureIA、UIB、
UICRespectively three-phase input voltage of A, B, C three-phase line to transformer；CA、CB、CCThe respectively electricity of distribution over the ground of three-phase line
Hold；ZAB、ZBC、ZACThe respectively three-phase windings of transformer；R0To be grounded transition resistance.Similarly ignore distribution line to be distributed over the ground
The influence of capacitor, and three-phase windings resistance value ZAB=ZBC=ZCA=Z2。
Obtain Δ-Y type transformer C phase primary side voltage value UCL:
By the way that formula (1) is denoted as equivalent impedance Z to item relevant with winding impedance in formula (2)k, can be by formula (1) and formula
(2) it is unified for following form, as UCLExpression formula:
For singlephase earth fault, since route is without broken string, failure upstream and downstream voltage is equal, therefore can be according to usual formula
It calculates:
Therefore deduce that the voltage vector diagram of load-side as shown in Figure 3.
And for single-phase wire break failure, the input voltage U of C phaseICBecome 0.Based on formula (3), single-phase wire break failure is born
It carries side to be analyzed, it can be deduced that relational graph as shown in Figure 4.
By comparison diagram 3 and Fig. 4 it is found that for singlephase earth fault, C phase measures after failure voltage UCLWith UAL+UBL
The sum of angle absolute value | θk| it is greater than 90 degree；And for single-phase wire break failure, | θk| less than 90 degree, and this relationship is
Through in view of all possible system parameter and failure occurrence condition.So utilizing the pass between load side voltage three-phase phase
It is a kind of feasible effective thinking that system, which carries out identification to single-phase wire break failure,.
Pass through the comparative analysis to false voltage feature, it can be deduced that carry out using failure back loading side transformer voltage single
One basic ideas of phase disconnection fault and the fault identification of singlephase earth fault: assuming that C phase is failure phase, while load is measured
The three-phase voltage vector U of side transformerAL、UBL、UCL, calculate vector (UAL+UBL) and UCLAngle theta, as | θ | at 90 ° of >, determine
For singlephase earth fault；And work as | θ | at < 90 °, then it is determined as single-phase wire break failure.
The simulation model of single loop line distribution network line is established using PSCAD/EMTDC software, route voltage rating is 10kV,
Its topological diagram is as shown in Figure 5.Two groups of failures are arranged in different location in Fig. 5 distribution line, include single-phase wire break in every group of failure
Failure and singlephase earth fault.Set abort situation is located at the route 5-6 in Fig. 5, and under failure after failure generation
The transformer primary side voltage of trip measures.
In route 5-6 failure, transition resistance R is grounded by changing0Progress simulated measurement (comparison of drawing for convenience,
Assuming that the ground connection transition resistance R of single-phase wire break trouble power side and load-side1With R2It is equal, and with R0Indicate), obtained angle theta
With R0Change curve is as shown in Figure 6.
In. fig. 6, it can be seen that failure angle theta is with R0The common feature of variation: the angle theta of single-phase wire break failure1From 90 degree
Start with R0Rise；And the angle theta of singlephase earth fault2With R0With R since 90 degree0Decline.By emulating two kinds obtained events
Hinder angle theta with R0Variation tendency and the result that is obtained by theoretical calculation it is almost the same.It can be seen from the figure that in ground connection electricity
Hinder larger (i.e. R0> 30 Ω) when, single-phase wire break failure angle theta1It is consistently less than 90 degree；And single-phase wire break failure angle theta1Always big
In 90 degree.So when with angle theta be according to accurately fault identifications can be carried out to two kinds of failures.
Claims (1)
1. a kind of power distribution network single-phase disconnection fault identification method based on distributed measurement, which is characterized in that this method include with
Lower step:
Step S1: power distribution network is monitored on-line using Wide Area Measurement System, when monitoring failure, is then surveyed by the wide area
The voltage and current data that amount system acquisition arrives carry out section positioning to failure according to D type traveling wave localization method, and using symmetrically
Component method obtains positive sequence, negative phase-sequence, residual voltage, current data；
Step S2: whether the boundary condition principium identification failure according to singlephase earth fault and single-phase wire break failure is single-phase earthing
Failure or single-phase wire break failure.If it is singlephase earth fault or single-phase wire break failure, then S3 is entered step；If not single-phase
Ground fault or single-phase wire break failure, then determining failure not is single-phase wire break failure, terminates fault identification；
Step S3: A, B, C three-phase voltage of measuring device in the trouble point downstream Wide Area Measurement System of synchronous acquisition failure t moment
Data, and store；
Step S4: defining C phase is failure phase, and A, B, C three-phase voltage data of storage are crossed to Fourier transformation all and obtain A, B, C
Three-phase voltage vector UAL、UBL、UCL；Then calculate UCLWith (UAL+UBL) angle value θ, formula is as follows:
Step S5: fault identification is carried out based on angle value θ: when | θ | at >=90 °, it is determined as singlephase earth fault；When | θ | < 90 °
When, then it is determined as single-phase wire break failure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910230814.7A CN109917227A (en) | 2019-03-26 | 2019-03-26 | Power distribution network single-phase disconnection fault identification method based on phase relation |
| PCT/CN2019/082821 WO2020191825A1 (en) | 2019-03-26 | 2019-04-16 | Phase-relationship-based method for single-phase disconnection fault identification in power distribution network |
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| CN201910230814.7A CN109917227A (en) | 2019-03-26 | 2019-03-26 | Power distribution network single-phase disconnection fault identification method based on phase relation |
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Cited By (2)
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| CN115113001A (en) * | 2022-07-12 | 2022-09-27 | 国网江苏省电力有限公司宿迁供电分公司 | Self-adaptive power distribution network single-phase disconnection fault positioning method |
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| CN115113001B (en) * | 2022-07-12 | 2023-10-20 | 国网江苏省电力有限公司宿迁供电分公司 | Self-adaptive power distribution network single-phase disconnection fault positioning method |
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