CN107340449A - A kind of method for locating single-phase ground fault and system of ADAPTIVE MIXED earthing mode - Google Patents
A kind of method for locating single-phase ground fault and system of ADAPTIVE MIXED earthing mode Download PDFInfo
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- CN107340449A CN107340449A CN201710457491.6A CN201710457491A CN107340449A CN 107340449 A CN107340449 A CN 107340449A CN 201710457491 A CN201710457491 A CN 201710457491A CN 107340449 A CN107340449 A CN 107340449A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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 present invention relates to a kind of method for locating single-phase ground fault and system of ADAPTIVE MIXED earthing mode, the real-time earthing mode of system is determined first, then failure judgment method is selected according to earthing mode, if earthing mode is low resistance grounding, fault section is determined using waveform analogue method；If earthing mode is small current neutral grounding, fault section is determined using amplitude com parison method.The present invention can adapt to the change of earthing mode automatically, realize the fault location of single-phase earthing, improve power supply reliability.
Description
Technical field
The present invention relates to distribution automation field, particularly a kind of singlephase earth fault of ADAPTIVE MIXED earthing mode is determined
Position method and system.
Background technology
Power network neutral point uses different earthing modes, residual voltage, zero-sequence current after its generation singlephase earth fault
Larger etc. electrical quantity feature difference, corresponding fault detect and processing mode are also different.For small resistance grounding system list
Phase earth fault, it produces hundreds of amperes of fault current, can realize fault location using zero sequence excess current principle.For small
Current grounding system（Isolated neutral, through grounding through arc）Singlephase earth fault, because fault current is small, arc suppression coil
Compensation makes power frequency quality lose fault signature, arc grounding and intermittence ground connection influence etc., and fault location is difficult.Difference ground connection
Mode（Including it is earth-free, through grounding through arc, through small resistor and Hybrid connections earthing mode）Different single-phase connect be present
Earth fault feature, the system of different earthing modes produce electrical connection may caused by singlephase earth fault can not position
Problem.
The content of the invention
In view of this, the purpose of the present invention is to propose to a kind of singlephase earth fault positioning side of ADAPTIVE MIXED earthing mode
Method and system, the change of earthing mode can be adapted to automatically, realize the fault location of single-phase earthing, improve power supply reliability.
The present invention is realized using following scheme：A kind of method for locating single-phase ground fault of ADAPTIVE MIXED earthing mode,
Specifically include following steps：
Step S1：Determine the real-time earthing mode of system；
Step S2：If earthing mode is low resistance grounding, fault section is determined using waveform analogue method；If earthing mode is small
Current earthing, then fault section is determined using amplitude com parison method.
Further, the step S1 specifically includes following steps：
Step S11：A distribution terminal on one section of feeder line is selected, the distribution terminal inquires about the distribution terminal adjacent with oneself,
Obtain the address of its local topology information and next stage distribution terminal；
Step S12：Repeat step S11 is until inquire the outlet switch attribute of transformer station, from the outlet switch attribute of transformer station
The middle earthing mode information for extracting the transformer station, so that it is determined that the real-time earthing state of this section of feeder line, and building topology；
Step S13：After topology is established, each distribution terminal will monitor the displacement information of all switches in topology in real time, be tied in topology
The real-time update of topology is carried out when structure changes.
Further, determine that fault section specifically includes following steps using amplitude com parison method described in step S2：
Step S211：When breaking down, each distribution terminal is started using the Sudden Changing Rate of transient zero-sequence current；
Step S212：Distribution terminal after startup, calculate zero-sequence current amplitude；
Step S213：According to step S212 result of calculation and zero-sequence current threshold value failure judgement position set in advance.
Further, in the step S212, the calculating of zero-sequence current amplitude uses Fourier algorithm.
Further, the step S213 is specially：The control terminal for being arranged on transformer station's main control room counts step S212
Obtained result is set to 1 compared with zero-sequence current threshold value set in advance, by the distribution terminal more than threshold value, will not surpass
The distribution terminal for crossing threshold value is set to 0, then abort situation is between distribution terminal 1 and distribution terminal 0.
Further, the step S213 also includes：Choose one start distribution terminal as this distribution terminal, if with this
The adjacent distribution terminal of distribution terminal detects failure zero-sequence current, then failure judgement does not occur with adjacent to match somebody with somebody in this distribution terminal
Section between electric terminals；If the distribution terminal adjacent with this distribution terminal do not detect failure zero-sequence current or not with
The adjacent distribution terminal of this distribution terminal, then failure judgement occurs where this distribution terminal on section, and this distribution terminal
For the upstream boundary distribution terminal of fault section.
Further, determine that fault section specifically includes following steps using waveform analogue method in step S2：
Step S221：When breaking down, each distribution terminal is started using the Sudden Changing Rate of transient zero-sequence current；
Step S222：The distribution terminal having been started up writes down the waveform and initial time of fault-signal；
Step S223：The waveform for the distribution terminal record transient zero-sequence current having been started up；
Step S224：The distribution terminal each started inquires about the recorder data of the distribution terminal adjacent with oneself, if adjacent matches somebody with somebody
Electric terminals do not have recorder data, then judge section of the trouble point not between this distribution terminal and adjacent distribution terminal；It is if adjacent
Distribution terminal have recorder data, calculate the recorder data system similar to the recorder data of adjacent distribution terminal of this distribution terminal
Number, if similarity factor is more than 0.8, section of the trouble point not between this distribution terminal and adjacent distribution terminal is judged, if phase
When being less than 0.5 like coefficient, then section of the trouble point between this distribution terminal and adjacent distribution terminal is judged, if similarity factor is situated between
Between 0.5 to 0.8, then it is suspected malfunctions section to judge the section between this distribution terminal and adjacent distribution terminal.
Further, the initial time in the step S222 be distribution terminal detect first zero-sequence current mutation when
Carve.
Further, the step S223 is specially：After each distribution terminal starts, on the basis of the initial time,
Record the transient-wave of front and rear each cycle of transient zero-sequence current.
Further, the waveform of transient zero-sequence current is recorded in the step S223, its sample rate is 128 points/power frequency
Cycle, record time are 40ms.
Particularly, present invention also offers a kind of singlephase earth fault with ADAPTIVE MIXED earthing mode described above to determine
The system that is adapted of position method, including distribution terminal at each switch being arranged on substation feeder and it is arranged on transformer station
The control terminal of main control room, each distribution terminal are connected by Ethernet with the control terminal；Monitoring is all in real time for each distribution terminal
The displacement information of switch and then the real-time earthing mode for determining system, and earthing mode is passed into the control terminal, control terminal
Judge to determine fault section using waveform analogue method if earthing mode is low resistance grounding, if earthing mode connects for low current
Ground, then fault section is determined using amplitude com parison method.
Compared with prior art, the present invention has following beneficial effect：Real-time earthing mode of the invention by determining system,
Selection uses different method failure judgement positions, determines fault section using waveform analogue method during small current neutral grounding mode, small
Fault section is determined using amplitude com parison method during resistance eutral grounding, the change of earthing mode can be adapted to automatically, and according to different
Earthing mode automatically selects different fault distinguishing methods, and solving electrical connection caused by the system of different earthing modes may
The problem of singlephase earth fault can be caused not position.The present invention uses the point-to-point communication of peer-to-peer network first, realizes distribution
The dynamic topology of terminal, according to dynamic topological structure, feeder system can determine real-time earthing mode；Tied then according to topology
Structure, the real-time earthing mode of system is judged, it is determined that using the method for locating single-phase ground fault of small current neutral grounding system or small
The single-phase earth fault detecting method of resistance grounded system.Faulty section is determined using waveform analogue method during small current neutral grounding mode
Section, fault section is determined using amplitude com parison method during low resistance grounding.The present invention can adapt to the change of earthing mode automatically, real
The fault location of existing single-phase earthing, improves power supply reliability.
Brief description of the drawings
Fig. 1 is the application block diagram in the embodiment of the present invention.
Fig. 2 is the main method flow diagram in the embodiment of the present invention.
Fig. 3 is the total small current neutral grounding mode fault location flow chart of the embodiment of the present invention.
Fig. 4 is the total low resistance grounding mode fault location flow chart of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described.
Present embodiments provide a kind of method for locating single-phase ground fault of ADAPTIVE MIXED earthing mode, specifically include with
Lower step：
Step S1：Determine the real-time earthing mode of system；
Step S2：If earthing mode is low resistance grounding, fault section is determined using waveform analogue method；If earthing mode is small
Current earthing, then fault section is determined using amplitude com parison method.
In the present embodiment, the step S1 specifically includes following steps：
Step S11：A distribution terminal on one section of feeder line is selected, the distribution terminal inquires about the distribution terminal adjacent with oneself,
Obtain the address of its local topology information and next stage distribution terminal；
Step S12：Repeat step S11 is until inquire the outlet switch attribute of transformer station, from the outlet switch attribute of transformer station
The middle earthing mode information for extracting the transformer station, so that it is determined that the real-time earthing state of this section of feeder line, and building topology；
Step S13：After topology is established, each distribution terminal will monitor the displacement information of all switches in topology in real time, be tied in topology
The real-time update of topology is carried out when structure changes.
In the present embodiment, determine that fault section specifically includes following steps using amplitude com parison method described in step S2：
Step S211：When breaking down, each distribution terminal is started using the Sudden Changing Rate of transient zero-sequence current；
Step S212：Distribution terminal after startup, calculate zero-sequence current amplitude；
Step S213：According to step S212 result of calculation and zero-sequence current threshold value failure judgement position set in advance.
In the present embodiment, in the step S212, the calculating of zero-sequence current amplitude uses Fourier algorithm.
In the present embodiment, the step S213 is specially：The control terminal of transformer station's main control room is arranged on by step
The result that S212 is calculated is set to 1 compared with zero-sequence current threshold value set in advance, by the distribution terminal more than threshold value,
Distribution terminal not less than threshold value is set to 0, then abort situation is between distribution terminal 1 and distribution terminal 0.
In the present embodiment, the step S213 also includes：A distribution terminal started is chosen as this distribution terminal, if
The distribution terminal adjacent with this distribution terminal detects failure zero-sequence current, then failure judgement does not occur in this distribution terminal and phase
Section between adjacent distribution terminal；If the distribution terminal adjacent with this distribution terminal does not detect failure zero-sequence current or not had
There is the distribution terminal adjacent with this distribution terminal, then failure judgement occurs where this distribution terminal on section, and this distribution
Terminal is the upstream boundary distribution terminal of fault section.
In the present embodiment, determine that fault section specifically includes following steps using waveform analogue method in step S2：
Step S221：When breaking down, each distribution terminal is started using the Sudden Changing Rate of transient zero-sequence current；
Step S222：The distribution terminal having been started up writes down the waveform and initial time of fault-signal；
Step S223：The waveform for the distribution terminal record transient zero-sequence current having been started up；
Step S224：The distribution terminal each started inquires about the recorder data of the distribution terminal adjacent with oneself, if adjacent matches somebody with somebody
Electric terminals do not have recorder data, then judge section of the trouble point not between this distribution terminal and adjacent distribution terminal；It is if adjacent
Distribution terminal have recorder data, calculate the recorder data system similar to the recorder data of adjacent distribution terminal of this distribution terminal
Number, if similarity factor is more than 0.8, section of the trouble point not between this distribution terminal and adjacent distribution terminal is judged, if phase
When being less than 0.5 like coefficient, then section of the trouble point between this distribution terminal and adjacent distribution terminal is judged, if similarity factor is situated between
Between 0.5 to 0.8, then it is suspected malfunctions section to judge the section between this distribution terminal and adjacent distribution terminal.
In the present embodiment, the initial time in the step S222 is that distribution terminal detects that zero-sequence current is mutated first
At the time of.
In the present embodiment, the step S223 is specially：After each distribution terminal starts, using the initial time as base
Standard, record the transient-wave of front and rear each cycle of transient zero-sequence current.
In the present embodiment, in the step S223 record transient zero-sequence current waveform, its sample rate be 128 points/
Frequency cycle, record time are 40ms.
Particularly, as shown in figure 1, Automation System for Distributing Substation is mainly by QS1, QS2（Outlet switch）And Q1, Q2,
Q3, Q4, Q5 are formed, and each switch corresponds to a distribution terminal STU.It is assumed that the transformer station where QS1 is small current neutral grounding
System, the transformer station where QS2 are small resistance grounding system, and during normal operation, Q3 is interconnection switch, close to the distribution of transformer station
Terminal STUA crosses the network topology that inquiry mode step by step obtains system, and according to the earthing mode of system, QS1, Q1, Q2 are according to small electricity
Earthing mode operation is flowed, when singlephase earth fault occurs, abort situation is determined using waveform analogue method, not tripped, only sends and accuses
Alert signal；QS2, Q3, Q4 are run according to low resistance grounding mode, when singlephase earth fault occurs, are according to zero-sequence current amplitude
No more line, which directly trips, cuts off failure.
The position relationship of the earthing mode of human configuration transformer station and distribution terminal first, after system starts, automatically
Establish network topology, and real-time servicing topology.As shown in figure 1, the transformer station where QS1 is small current neutral grounding system, QS2
The transformer station at place is small resistance grounding system.
As shown in Fig. 2 main program step is as follows：
Step 1, logic flow starts；
Step 2, the foundation of network topology:
Using the distribution terminal at transformer station outlet wire protecting device QS1 as master control STU, by the way of inquiring about step by step, successively to Q1,
Q2, Q6 are inquired about, until inquire interconnection switch Q3, in query process, QS1 is by the earthing mode of this transformer station, the present embodiment
In be small current neutral grounding mode, pass to Q1, Q2, Q6 successively；Similarly, using the distribution terminal at transformer station QS2 as master control STU,
Similar to Q5, Q7, Q4 query process, the transformer station where difference is QS2 is small resistance grounding system.
Step 3, fault location：
Each STU systems according to where this STU on circuit are the differences of small resistance grounding system or small current neutral grounding system
Adaptively selected suitable Fault Locating Method.Enter step 4 if system is small resistance grounding system, if system is small circuit
Earthed system, then into step 7.
Step 4, small resistance grounding system, positioned using zero-sequence current amplitude method, as shown in Figure 4：
Using Fourier algorithm, zero-sequence current amplitude is calculated；
Step 5, communicated with adjacent end：
After STU detects that zero-sequence current amplitude is out-of-limit, communicated with adjacent terminal, obtain the failure zero-sequence current letter of adjacent switch
Breath.
Step 6, failure criterion：
If the adjacent switch in switch side detects failure zero-sequence current, illustrate passing through property of failure, failure is not in the side
Section on；If the adjacent no failure zero-sequence current of switch in switch side is flowed through in other words without adjacent switch, say
Bright failure zero-sequence current is injection, and failure confirms oneself to belong to fault section upstream boundary switch in the lateral areas section.
Step 7, small current neutral grounding system, positioned using transient zero-sequence current waveform comparison method, as shown in Figure 3：
Distribution terminal is started using zero-sequence current Sudden Changing Rate, records the transient-wave of zero-sequence current；
Step 8, failure initial time：
Failure initial time is determined using the motor synchronizing of transient zero-sequence current Sudden Changing Rate, after line failure, distribution terminal inspection
The zero-sequence current Sudden Changing Rate measured is considered synchronization, i.e., when can determine that failure originates by the detection of first catastrophe point
Carve.
Step 9, transient zero-sequence current waveform is recorded：
After each distribution terminal detects zero-sequence current transient signal, on the basis of transient zero-sequence current Sudden Changing Rate initial time, note
The transient-wave of each 1 cycle before and after record.
Step 10, failure criterion：
Each starts successful STU, inquiry adjacent S TU recorder data, if adjacent using transient zero-sequence current Sudden Changing Rate
STU does not have recorder data, then judges trouble point not in this section.If adjacent S TU has recorder data, this STU recording numbers are calculated
According to the similarity factor with adjacent S TU recorder datas, when similarity factor is more than 0.8, trouble point is judged not in this section, when similar
When coefficient is less than 0.5, fault section is judged；It is suspected malfunctions section when similarity factor is between 0.5 and 0.8.
Particularly, the present embodiment also includes and the list based on ADAPTIVE MIXED earthing mode described above in above-described embodiment
Distribution terminal at system corresponding to phase earth fault localization method, including each switch being arranged on substation feeder and
The control terminal of transformer station's main control room is arranged on, each distribution terminal is connected by Ethernet with the control terminal；Each distribution terminal
The displacement information of all switches is monitored in real time and then determines the real-time earthing mode of system, and earthing mode is passed into the control
End processed, control terminal judges to determine fault section using waveform analogue method if earthing mode is low resistance grounding, if earthing mode
For small current neutral grounding, then fault section is determined using amplitude com parison method.
The foregoing is only presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, it should all belong to the covering scope of the present invention.
Claims (10)
- A kind of 1. method for locating single-phase ground fault of ADAPTIVE MIXED earthing mode, it is characterised in that：Comprise the following steps：Step S1：Determine the real-time earthing mode of system；Step S2：If earthing mode is low resistance grounding, fault section is determined using waveform analogue method；If earthing mode is small Current earthing, then fault section is determined using amplitude com parison method.
- 2. a kind of method for locating single-phase ground fault of ADAPTIVE MIXED earthing mode according to claim 1, its feature It is：The step S1 specifically includes following steps：Step S11：A distribution terminal on one section of feeder line is selected, the distribution terminal inquires about the distribution terminal adjacent with oneself, Obtain the address of its local topology information and next stage distribution terminal；Step S12：Repeat step S11 is until inquire the outlet switch attribute of transformer station, from the outlet switch attribute of transformer station The middle earthing mode information for extracting the transformer station, so that it is determined that the real-time earthing state of this section of feeder line, and building topology；Step S13：After topology is established, each distribution terminal will monitor the displacement information of all switches in topology in real time, be tied in topology The real-time update of topology is carried out when structure changes.
- 3. a kind of method for locating single-phase ground fault of ADAPTIVE MIXED earthing mode according to claim 1, its feature It is：Determine that fault section specifically includes following steps using amplitude com parison method described in step S2：Step S211：When breaking down, each distribution terminal is started using the Sudden Changing Rate of transient zero-sequence current；Step S212：Distribution terminal after startup, calculate zero-sequence current amplitude；Step S213：According to step S212 result of calculation and zero-sequence current threshold value failure judgement position set in advance.
- 4. a kind of method for locating single-phase ground fault of ADAPTIVE MIXED earthing mode according to claim 3, its feature It is：In the step S212, the calculating of zero-sequence current amplitude uses Fourier algorithm.
- 5. a kind of method for locating single-phase ground fault of ADAPTIVE MIXED earthing mode according to claim 3, its feature It is：The step S213 is specially：It is arranged on the result that step S212 is calculated the control terminal of transformer station's main control room Compared with zero-sequence current threshold value set in advance, the distribution terminal more than threshold value is set to 1, by matching somebody with somebody not less than threshold value Electric terminals are set to 0, then abort situation is between distribution terminal 1 and distribution terminal 0.
- 6. the step S213 also includes：Choose one start distribution terminal as this distribution terminal, if with this distribution terminal phase Adjacent distribution terminal detects failure zero-sequence current, then failure judgement does not occur between this distribution terminal and adjacent distribution terminal Section；If the distribution terminal adjacent with this distribution terminal do not detect failure zero-sequence current or not with this distribution terminal Adjacent distribution terminal, then failure judgement occurs where this distribution terminal on section, and this distribution terminal is fault section Upstream boundary distribution terminal.
- 7. a kind of method for locating single-phase ground fault of ADAPTIVE MIXED earthing mode according to claim 1, its feature It is：Determine that fault section specifically includes following steps using waveform analogue method in step S2：Step S221：When breaking down, each distribution terminal is started using the Sudden Changing Rate of transient zero-sequence current；Step S222：The distribution terminal having been started up writes down the waveform and initial time of fault-signal；Step S223：The waveform for the distribution terminal record transient zero-sequence current having been started up；Step S224：The distribution terminal each started inquires about the recorder data of the distribution terminal adjacent with oneself, if adjacent matches somebody with somebody Electric terminals do not have recorder data, then judge section of the trouble point not between this distribution terminal and adjacent distribution terminal；It is if adjacent Distribution terminal have recorder data, calculate the recorder data system similar to the recorder data of adjacent distribution terminal of this distribution terminal Number, if similarity factor is more than 0.8, section of the trouble point not between this distribution terminal and adjacent distribution terminal is judged, if phase When being less than 0.5 like coefficient, then section of the trouble point between this distribution terminal and adjacent distribution terminal is judged, if similarity factor is situated between Between 0.5 to 0.8, then it is suspected malfunctions section to judge the section between this distribution terminal and adjacent distribution terminal.
- 8. a kind of method for locating single-phase ground fault of ADAPTIVE MIXED earthing mode according to claim 7, its feature It is：The step S223 is specially：After each distribution terminal starts, on the basis of the initial time, transient zero-sequence is recorded The transient-wave of front and rear each cycle of electric current.
- 9. a kind of method for locating single-phase ground fault of ADAPTIVE MIXED earthing mode according to claim 7, its feature It is：The waveform of transient zero-sequence current is recorded in the step S223, its sample rate is 128 points/frequency cycle, records the time For 40ms.
- A kind of 10. single-phase earth fault locating system of ADAPTIVE MIXED earthing mode, it is characterised in that：Including being arranged on power transformation Stand and the distribution terminal at each switch on feeder line and be arranged on the control terminal of transformer station's main control room, each distribution terminal by with Too net is connected with the control terminal；Each distribution terminal monitors the displacement information of all switches and then determines connecing in real time for system in real time Ground mode, and earthing mode is passed into the control terminal, control terminal judges to use ripple if earthing mode is low resistance grounding Shape analogue method determines fault section, if earthing mode is small current neutral grounding, fault section is determined using amplitude com parison method.
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