CN107966633A - The one-phase earthing failure in electric distribution network circuit quick judgment method and system of a kind of electric power system - Google Patents
The one-phase earthing failure in electric distribution network circuit quick judgment method and system of a kind of electric power system Download PDFInfo
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- CN107966633A CN107966633A CN201711129608.4A CN201711129608A CN107966633A CN 107966633 A CN107966633 A CN 107966633A CN 201711129608 A CN201711129608 A CN 201711129608A CN 107966633 A CN107966633 A CN 107966633A
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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
Abstract
The present invention, which discloses the one-phase earthing failure in electric distribution network circuit quick judgment method of electric power system and system, method, to be included：In real time monitoring PT secondary sides open delta voltage or each feeder line, branched line head end zero-sequence current and generate monitoring information, and judge whether system occurs singlephase earth fault according to the monitoring information；When judging to occur singlephase earth fault, neutral point displacement voltage state and the state of three-phase voltage are monitored, and failure phase is determined according to the displacement voltage state of neutral point and the state of three-phase voltage；Bus-bar fault phase high-speed switch is closed a floodgate, while monitors the zero-sequence current variation characteristic for analyzing each bar feeder line and branch line head end, fault wire is selected according to the variation characteristic of each bar feeder line and the zero-sequence current of branch line.There is faulty line accuracy of judgement and efficient.
Description
Technical field
The present invention relates in electric power project engineering field, and in particular to the one-phase earthing failure in electric distribution network circuit of electric power system
Quick judgment method and system.
Background technology
Distribution network generally uses neutral non-effective grounding mode, and singlephase earth fault is most common in power distribution network
Failure mode, since fault current is small, system line voltage is basically unchanged, and can be continued to user for therefore generally allowing to connect with single-phase
Earth fault runs 1~2h.But for arc grounding failure, if ground arc exists for a long time, intermittent arc overvoltage is anti-
Appear again existing, can damage to equipment in system and line insulation.Internal overvoltage and lightning stroke in distribution network system, bird pest,
The factors such as broken string, branch may all cause arc grounding failure, and trouble point electric arc constantly extinguishes and restrikes, cause system inductance,
The electromagnetic viscosimeter of capacitor loop, produces intermittent arc grounding overvoltage.
The distribution network of the prior art can not quickly determine failure and failure judgement circuit effect is poor.
The content of the invention
The technical problem to be solved in the present invention is, in view of the deficiencies of the prior art, there is provided a kind of distribution of electric power system
Net singlephase earth fault circuit quick judgment method and system, to improve the judging efficiency of failure and failure judgement circuit and accurate
Rate.
The present invention, which provides a kind of one-phase earthing failure in electric distribution network circuit quick judgment method of electric power system, includes step：
In real time monitoring PT secondary sides open delta voltage or each feeder line, branched line head end zero-sequence current and generate monitoring
Information, and judge whether system occurs singlephase earth fault according to the monitoring information；
When judging to occur singlephase earth fault, the displacement voltage state of neutral point and the state of three-phase voltage are monitored, and
Failure phase is determined according to the state of the displacement voltage state of neutral point and three-phase voltage；
Bus-bar fault phase high-speed switch is closed a floodgate, while monitors the zero-sequence current change for analyzing each bar feeder line and branch line head end
Change feature, fault wire is selected according to the variation characteristic of each bar feeder line and the zero-sequence current of branch line.
Preferably, the monitoring PT secondary sides open delta voltage in real time or each feeder line, the head end zero sequence electricity of branched line
Flow and generate monitoring information, and judge that the step of whether system occurs singlephase earth fault is specifically wrapped according to the monitoring information
Include：
Monitoring PT secondary side open delta voltages in real time, are the presetting threshold value of open delta voltage, when the opening three
Judge that singlephase earth fault occurs for electric power system when angle voltage voltage increases to over the threshold value；Or
When there is the mutation of circuit head end zero-sequence current, the zero sequence electricity of each feeder line of monitoring analysis electric power system and branched line
Whether stream signal undergos mutation in synchronization, if then judging that singlephase earth fault occurs for electric power system.
Preferably, it is described when judging to occur singlephase earth fault, monitor the displacement voltage state and three-phase electricity of neutral point
The state of pressure, and the step of failure phase is determined according to the displacement voltage state of neutral point and the state of three-phase voltage specifically include：
After singlephase earth fault is judged as, the displacement voltage and three-phase voltage of the neutral point are analyzed in monitoring；
When occur a phase voltage close to 0 and in addition two-phase voltage be increased to the situation near line voltage when then voltage in transient state
It is failure phase that process is reduced to close to 0 separate quickly, alternatively, when three-phase voltage value scope is in the electric power system voltage
During preset ratio value, then judge the hysteresis of voltage steady-state value highest phase mutually for failure phase.
Preferably, it is described that bus-bar fault phase high-speed switch closes a floodgate, while monitor each bar feeder line of analysis and branch line head end
Zero-sequence current variation characteristic, the step of selecting fault wire according to the variation characteristic of each bar feeder line and the zero-sequence current of branch line has
Body includes：
The bus-bar fault that will determine that mutually carries out high-speed switch action and closes a floodgate, and monitors and analyze the zero of each bar feeder line head end
Sequence current recording；
Before high-speed switch combined floodgate, if the electric current of zero sequence and other all circuit zero sequence current direction phases wherein on a circuit
Anti- and amplitude is more than All other routes, and the zero sequence wherein on a circuit before and after the busbar carries out high-speed switch action
Current direction changes, then can determine whether the circuit is faulty line.
Preferably, including：Earth fault judgment module, for monitoring the PT secondary sides open delta electricity for electric system in real time
Pressure or each feeder line, branched line head end zero-sequence current and generate monitoring information, and judge that system is according to the monitoring information
No generation singlephase earth fault；
Failure phase judgment module, for when judging to occur singlephase earth fault, monitoring the displacement voltage state of neutral point
With the state of three-phase voltage, and failure phase is determined according to the displacement voltage state of neutral point and the state of three-phase voltage；
Fault wire determining module, when determining failure phase for failure phase judgment module, bus-bar fault phase high-speed switch is closed
Lock, while monitor the zero-sequence current variation characteristic for analyzing each bar feeder line and branch line head end, according to each bar feeder line and branch line
The variation characteristic of zero-sequence current selects fault wire.
Preferably, the earth fault judgment module includes：First earth fault judging unit, for monitoring PT bis- in real time
Secondary side opening triangular voltages, are the presetting threshold value of open delta voltage, when the open delta voltage voltage increases to over this
Judge that singlephase earth fault occurs for electric power system during threshold value；Or/and
Second earth fault judging unit, for when there is the mutation of circuit head end zero-sequence current, monitoring analysis, which is powered, to be
Whether the zero sequence current signal of each feeder line and branched line of uniting undergos mutation in synchronization, if then judging electric power system
Generation singlephase earth fault.
Preferably, the failure phase judgment module includes：
Voltage monitoring unit, for earth fault judgment module judge for electric system as singlephase earth fault after, monitoring
Analyze the displacement voltage and three-phase voltage of the neutral point；
Fisrt fault phase judging unit, is connected to when the voltage monitoring unit monitors with the voltage monitoring unit
One phase voltage close to 0 and in addition two-phase voltage be increased to the situation near line voltage when then judge the voltage in transient process quickly
It is failure phase to be reduced to close to 0 separate；
Second failure phase judging unit, is connected to when the voltage monitoring unit monitors with the voltage monitoring unit
Three-phase voltage value scope then judges the hysteresis of voltage steady-state value highest phase in the preset ratio value of the electric power system voltage
It is mutually failure phase.
Preferably, the fault wire determining module includes：Bus-bar fault processing unit, for barrier phase judgment module to be judged
The bus-bar fault mutually carry out high-speed switch action and close a floodgate, and monitor the zero-sequence current recording for analyzing each bar feeder line head end；
Faulty line determination unit, for bus-bar fault processing unit carry out high-speed switch combined floodgate before, when a wherein line
The electric current of zero sequence is opposite with other all circuit zero sequence current directions on road and amplitude is more than All other routes, and in the busbar
When wherein the current direction of zero sequence changes on a circuit described in before and after progress high-speed switch action, judge the circuit for event
Hinder circuit.
Compared to the prior art, the one-phase earthing failure in electric distribution network circuit of the electric power system of the embodiment of the present invention quickly judges
Method and system by monitoring PT secondary sides open delta voltage or each feeder line, the head end zero-sequence current of branched line and life in real time
Judge whether system occurs singlephase earth fault into monitoring information, and according to the monitoring information；When single-phase earthing occurs for judgement
During failure, monitor the displacement voltage state of neutral point and the state of three-phase voltage, and according to the displacement voltage state of neutral point and
The state of three-phase voltage determines failure phase；Bus-bar fault phase high-speed switch is closed a floodgate, while monitors each bar feeder line of analysis and branch
The zero-sequence current variation characteristic of line head end, fault wire is selected according to the variation characteristic of each bar feeder line and the zero-sequence current of branch line.
Be capable of precise and high efficiency determines faulty line, has the advantages that judging efficiency is high and accuracy is good.
Brief description of the drawings
The present invention is specifically described below with reference to attached drawing and with reference to example, advantages of the present invention and implementation will
More obvious, wherein content is only used for explanation of the present invention shown in attached drawing, without forming to the present invention in all senses
On limitation, in the accompanying drawings：
Fig. 1 is the stream that the one-phase earthing failure in electric distribution network circuit quick judgment method one of electric power system of the present invention is preferable to carry out
Journey schematic diagram；
Fig. 2 is that the one-phase earthing failure in electric distribution network circuit of the electric power system of one embodiment of the present invention quickly judges system
Structure block diagram；
Fig. 3 is the structure chart of high-speed switch type arc-extinction device of the present invention；
Fig. 4 is experiment substation 10kV system main wiring diagrams；
Fig. 5 is metallic earthing Test Drawing；
Fig. 6 tests for arcing ground；
Fig. 7 circuits 1. arc grounding failure when high-speed switch type arc-extinction device in voltage and current oscillogram；
Fig. 8 for circuit 1. arc grounding failure when current in the fault point oscillogram.
Embodiment
Referring to Fig. 1, it is that the one-phase earthing failure in electric distribution network circuit quick judgment method one of electric power system of the present invention is excellent
Select the flow diagram implemented.The one-phase earthing failure in electric distribution network circuit quick judgment method of the electric power system of the present embodiment includes
Step：
S1：Monitoring PT (Potential transformer, voltage transformer abbreviation PT) secondary side open delta electricity in real time
Pressure or each feeder line, branched line head end zero-sequence current and generate monitoring information, and judge that system is according to the monitoring information
No generation singlephase earth fault；
S3：When judging to occur singlephase earth fault, the displacement voltage state of neutral point and the state of three-phase voltage are monitored,
And failure phase is determined according to the displacement voltage state of neutral point and the state of three-phase voltage；
S5：Bus-bar fault phase high-speed switch is closed a floodgate, while monitors the zero sequence electricity for analyzing each bar feeder line and branch line head end
Variation characteristic is flowed, fault wire is selected according to the variation characteristic of each bar feeder line and the zero-sequence current of branch line.
Compared to the prior art, the one-phase earthing failure in electric distribution network circuit of the electric power system of the embodiment of the present invention quickly judges
Method has the advantages that faulty line accuracy of judgement and efficient.
Specifically, in other embodiments, step S1 is specifically included：
Monitoring PT secondary side open delta voltages in real time, are the presetting threshold value of open delta voltage, when the opening three
Judge that singlephase earth fault occurs for electric power system when angle voltage voltage increases to over the threshold value；Or
When there is the mutation of circuit head end zero-sequence current, the zero sequence electricity of each feeder line of monitoring analysis electric power system and branched line
Whether stream signal undergos mutation in synchronization, if then judging that singlephase earth fault occurs for electric power system.
Specifically, the step S3 is specifically included：
After singlephase earth fault is judged as, the displacement voltage and three-phase voltage of the neutral point are analyzed in monitoring；
When there is a phase voltage and being increased to the situation near line voltage close to O and other two-phase voltage then voltage in transient state
It is failure phase that process is reduced to close to 0 separate quickly, alternatively, when three-phase voltage value scope is in the electric power system voltage
During preset ratio value, then judge the hysteresis of voltage steady-state value highest phase mutually for failure phase.Preferably, the preset ratio value is set
For 5%-10%.
Specifically, the step S5 is specifically included：
The bus-bar fault that will determine that mutually carries out high-speed switch action and closes a floodgate, and monitors and analyze the zero of each bar feeder line head end
Sequence current recording；
Before high-speed switch combined floodgate, if the electric current of zero sequence and other all circuit zero sequence current direction phases wherein on a circuit
Anti- and amplitude is more than All other routes, and the zero sequence wherein on a circuit before and after the busbar carries out high-speed switch action
Current direction changes, then can determine whether the circuit is faulty line.
Compared to the prior art, the one-phase earthing failure in electric distribution network circuit of the electric power system of the embodiment of the present invention quickly judges
Method and system by monitoring PT secondary sides open delta voltage or each feeder line, the head end zero-sequence current of branched line and life in real time
Judge whether system occurs singlephase earth fault into monitoring information, and according to the monitoring information；When single-phase earthing occurs for judgement
During failure, monitor the displacement voltage state of neutral point and the state of three-phase voltage, and according to the displacement voltage state of neutral point and
The state of three-phase voltage determines failure phase；Bus-bar fault phase high-speed switch is closed a floodgate, while monitors each bar feeder line of analysis and branch
The zero-sequence current variation characteristic of line head end, fault wire is selected according to the variation characteristic of each bar feeder line and the zero-sequence current of branch line.
Be capable of precise and high efficiency determines faulty line, has the advantages that judging efficiency is high and accuracy is good.
Again referring to Fig. 2, it is the one-phase earthing failure in electric distribution network circuit of the electric power system of one embodiment of the present invention
The quick structure block diagram for judging system.The one-phase earthing failure in electric distribution network circuit of the electric power system of the present embodiment is quickly sentenced
Disconnected system includes：
Earth fault judgment module 11, for monitoring PT secondary sides open delta voltage or each feedback for electric system in real time
Line, branched line head end zero-sequence current and generate monitoring information, and judge whether system occurs list according to the monitoring information
Phase earth fault.The earth fault judgment module includes：
First earth fault judging unit, is open delta voltage for monitoring PT secondary side open delta voltages in real time
A presetting threshold value, judges that single-phase earthing occurs for electric power system when the open delta voltage voltage increases to over the threshold value
Failure；Or/and
Second earth fault judging unit, for when there is the mutation of circuit head end zero-sequence current, monitoring analysis, which is powered, to be
Whether the zero sequence current signal of each feeder line and branched line of uniting undergos mutation in synchronization, if then judging electric power system
Generation singlephase earth fault.
Failure phase judgment module 13, for when judging to occur singlephase earth fault, monitoring the displacement voltage shape of neutral point
The state of state and three-phase voltage, and failure phase is determined according to the displacement voltage state of neutral point and the state of three-phase voltage.It is described
Failure phase judgment module includes：
Voltage monitoring unit, for earth fault judgment module judge for electric system as singlephase earth fault after, monitoring
Analyze the displacement voltage and three-phase voltage of the neutral point；
Fisrt fault phase judging unit, is connected to when the voltage monitoring unit monitors with the voltage monitoring unit
One phase voltage close to 0 and in addition two-phase voltage be increased to the situation near line voltage when then judge the voltage in transient process quickly
It is failure phase to be reduced to close to 0 separate；
Second failure phase judging unit, is connected to when when the voltage monitoring unit monitors with the voltage monitoring unit
To three-phase voltage value scope in the preset ratio value of the electric power system voltage, then the stagnant of voltage steady-state value highest phase is judged
It is mutually failure phase afterwards.Preferably, the preset ratio value is arranged to 5%-10%.
Fault wire determining module 15, when determining failure phase for failure phase judgment module, by bus-bar fault phase high-speed switch
Close a floodgate, while monitor the zero-sequence current variation characteristic for analyzing each bar feeder line and branch line head end, according to each bar feeder line and branch line
The variation characteristic of zero-sequence current select fault wire.The fault wire determining module includes：
Bus-bar fault processing unit, is moved for the bus-bar fault for hindering the judgement of phase judgment module mutually to be carried out high-speed switch
Close a floodgate, and monitor the zero-sequence current recording for analyzing each bar feeder line head end.
Faulty line determination unit, for bus-bar fault processing unit carry out high-speed switch combined floodgate before, when a wherein line
The electric current of zero sequence is opposite with other all circuit zero sequence current directions on road and amplitude is more than All other routes, and in the busbar
When wherein the current direction of zero sequence changes on a circuit described in before and after progress high-speed switch action, judge the circuit for event
Hinder circuit.
Fig. 3 is referred to again to Fig. 8.The present invention also provides a kind of one-phase earthing failure in electric distribution network of handy above-mentioned electric power system
Circuit quickly judges that system realizes the high-speed switch type arc-extinction device for electric line extinguishing arc, the knot of the high-speed switch type arc-extinction device
Structure is as shown in Figure 3.High-speed switch type arc-extinction device is monolithically integrated in arc extinction cabinet, and the mother in power supply power station is connected to by breaker
On line, mainly by with the auxiliary voltage transformer pt of secondary winding, microcomputerized controller ZK, can individual-phase control high-speed switch
JZ, three phase combined over-voltage protector TBP etc. are formed.Microcomputerized controller ZK in the present embodiment is that is, above-mentioned distribution
Net singlephase earth fault circuit quickly judges system, and microcomputerized controller ZK connects with the voltage transformer pt with auxiliary secondary winding
Connect for monitoring the change of system three-phase voltage, when the open delta both end voltage of PT secondary windings increases to over predetermined threshold value,
Start the voltage signal converter of microcomputerized controller ZK, immediately discriminating fault types, if PT ferromagnetic resonance failures occur, due to PT
First winding neutral point is connected to thermistor resonance eliminator, can act elimination resonance, PT openings rapidly when PT ferromagnetic resonances occur
The voltage of triangle can return to normal operating level quickly, and device also returns to original state.
Microcomputerized controller ZK is that the voltage and current signal of system is handled and calculated, and completes fault distinguishing, failure
Phase selection, failure line selection and the functions such as high-speed switch action signal are sent, single-phase earthing is completed according to the voltage of PT open deltas
Fault distinguishing, restarts Fault Phase Selection program, separate to failure to judge, then sends switching signal to high-speed switch.It is micro-
Machine controller ZK also needs to complete the function of failure line selection, and after high-speed switch action, controller is believed according to fault current recording
Number carry out the identification of faulty line, it is then different according to the type of faulty line and send different signals, if break down
Circuit is overhead transmission line, and failure is mostly arc light failure thereon, then needs to send separating brake to high-speed switch over time
Signal, if PT open delta voltages recover normal after switch separating brake, i.e., earth fault has eliminated, and controller returns to initial shape
State；Conversely, PT open delta voltages should then be again started up Fault Phase Selection program still above the situation of threshold value after separating brake, then send
High-speed switch switching signal.But if the circuit to break down is cable run, controller just needs to send high-speed switch point
Lock signal, should keep switch in "on" position, and safety value is in faulted phase voltage along ensuring.
The high-speed switch JZ of individual-phase control can complete switch closing and switch opening action in a short period of time, receive control
Corresponding separate switch quick acting is closed a floodgate after the switching signal that device ZK is sent, and the earth fault on system feeder line is transferred to is
The metallic earthing united on busbar；If receiving the sub-gate signal of controller ZK, the corresponding separate rapid separating brake of switch, cut-out
Single-phase earth fault current, system recovers normal operation at random if failure vanishes.
The function of three phase combined over-voltage protector TBP is by system three-phase before the action of high-speed switch type arc-extinction device
Voltage limits within the specific limits, avoids the occurrence of extremely serious electricity excessively and threatens equipment safety.Meanwhile in order to ensure mutual induction of voltage
The safety of other equipment in device PT and arc extinction cabinet, has been respectively mounted fuse XD on PT and the connecting line of high-speed switch and busbar,
Occur current anomaly it is elevated in the case of can quick fuse, device is opened from system break, to protect equipment safety.
After correct action of the invention, arc grounding is converted into metallic earthing, ground arc can extinguish quickly, eliminate
Electric arc is damaged caused by trouble point, prevents the phase fault caused by wandering, is avoided more serious accident and is occurred；
It is to have very much to the weak isolating equipment in system and cable run and system overvoltage level has also obtained effective limitation
Profit.High-speed switch type arc-extinction device can show that the device can be very by the action extinguishing arc time by controlling in 20ms or so
Short time (about 1 cycle) completes arc grounding being converted into metallic earthing process, even in ground fault resistance compared with
Greatly, in the case that fault distinguishing and Fault Phase Selection take longer for, device also can in 2 cycles execution process,
Actuation time is short not only extremely advantageous safely to system, at the same also to getting an electric shock when personal safety it is favourable.
Fig. 4 is the main wiring diagram for testing substation.Substation's 10kV systems are tested using single mother partition wiring and with bypass
Busbar, wherein totally 11 outlets, outlet 1~6 are connected in busbar I sections, and outlet 7~11 is connected in busbar II sections, 5 He of outlet
9 be all fronts cable run, other outlets are sent out after being drawn by cable by overhead line.One is respectively mounted on the busbar of two sections of power station
High-speed switch type arc-extinction device.
This experiment carries out on the outlet 1,2 and outlet 8 in power station this 3 feeder lines, this 3 circuits are to pass through electricity
Cable is sent out after drawing by overhead line, is respectively labeled as circuit 1., 2., 8..Circuit 1. with circuit 2. on carry out 2 minor metals respectively
Property earth fault and 2 arc grounding failures, circuit is 8. upper to carry out 4 minor metal earth faults and 4 arc grounding failures；It is small
Resistance eutral grounding failure then circuit 2. with circuit 8. on carry out 2 times respectively, carry out 20 artificial earthing's Test to Failure altogether.
(1) metallic earthing Test to Failure
The test connection of metallic earthing is as shown in Figure 5.Breaker uses on-pole switch, by breaker enter line side during experiment
B phases are reliably connected respectively with outgoing line side A phases, enter line side C phases and outgoing line side B phases.Breaker enter line side A phases and subject circuit
Treat that Earth Phase is reliably connected, outgoing line side C phases are through instrument CT reliable grounds.
(2) arc grounding Test to Failure
The test connection of arc grounding is as shown in fig. 6, wherein arc grounding is produced with discharging gap, to ensure reliable rise
Arc, clearance distance are adjusted to 1~2mm.By breaker enter line side B phases and outgoing line side A phases, enter line side C phases and outgoing line side B during experiment
Mutually it is reliably connected respectively, breaker enter line side A phases treat that Earth Phase is reliably connected with subject circuit, and outgoing line side C phases are through electric discharge
Gap and instrument CT reliable grounds.
(3) low resistance grounding Test to Failure
Low resistance grounding mistake wiring is similar with the metallic earthing Test to Failure wiring shown in Fig. 5, in fault loop
A small resistor is sealed in simulate, the value of small resistor is about 10 Ω.
In 8 arc grounding Test to Failure of progress, high-speed switch type arc-extinction device can be acted correctly, by failure phase
High-speed switch closes a floodgate, and same will can control in 20ms or so actuation time.
In 8 arc grounding Test to Failure of progress, high-speed switch type arc-extinction device can be acted correctly, by failure phase
High-speed switch closes a floodgate, and same will can control in 20ms or so actuation time.
For arc grounding failure, after high-speed switch action is closed a floodgate, fault residual current is 0, illustrates that arc-extinction device can
Achieve the purpose that complete blow-out.During arc grounding failure, busbar faulted phase voltage connects after the action of high-speed switch type arc-extinction device
Nearly zero, non-faulting phase voltage is also kept at line voltage or so, will not produce intermittent arc grounding overvoltage, endanger equipment and
Line insulation.
Circuit 1. on carry out arc grounding Test to Failure when, the voltage and current that measures in high-speed switch type arc-extinction device
Waveform is as shown in fig. 7, waveform is A phase, B phase, C phase, residual voltage waveform successively from top to bottom and is entered by high-speed switch in figure
The current waveform on ground.The current waveform for flowing through trouble point is as shown in Figure 8.
Those skilled in the art do not depart from the essence and spirit of the present invention, can have various deformation scheme to realize the present invention,
The foregoing is merely preferably feasible embodiment of the invention, not thereby limits to the interest field of the present invention, all with this
The equivalent structure change that description of the invention and accompanying drawing content are made, is both contained within the interest field of the present invention.
Claims (8)
1. the one-phase earthing failure in electric distribution network circuit quick judgment method of a kind of electric power system, it is characterised in that including step：
In real time monitoring PT secondary sides open delta voltage or each feeder line, branched line head end zero-sequence current and generate monitoring letter
Breath, and judge whether system occurs singlephase earth fault according to the monitoring information；
When judging to occur singlephase earth fault, the displacement voltage state of neutral point and the state of three-phase voltage are monitored, and according to
The displacement voltage state of neutral point and the state of three-phase voltage determine failure phase；
Bus-bar fault phase high-speed switch is closed a floodgate, while monitors the zero-sequence current change spy for analyzing each bar feeder line and branch line head end
Sign, fault wire is selected according to the variation characteristic of each bar feeder line and the zero-sequence current of branch line.
2. one-phase earthing failure in electric distribution network circuit quick judgment method according to claim 1, it is characterised in that the reality
When monitor PT secondary sides open delta voltage or each feeder line, branched line head end zero-sequence current and generate monitoring information, and root
Judge that the step of whether system occurs singlephase earth fault specifically includes according to the monitoring information：
Monitoring PT secondary side open delta voltages in real time, are the presetting threshold value of open delta voltage, when open delta electricity
Judge that singlephase earth fault occurs for electric power system when piezoelectricity pressure increases to over the threshold value；Or
When there is the mutation of circuit head end zero-sequence current, the zero-sequence current letter of each feeder line of monitoring analysis electric power system and branched line
Number whether undergo mutation in synchronization, if then judging electric power system generation singlephase earth fault.
3. one-phase earthing failure in electric distribution network circuit quick judgment method according to claim 1, it is characterised in that described to work as
When judging to occur singlephase earth fault, the displacement voltage state of neutral point and the state of three-phase voltage are monitored, and according to neutral point
Displacement voltage state and the state of three-phase voltage the step of determining failure phase specifically include：
After singlephase earth fault is judged as, the displacement voltage and three-phase voltage of the neutral point are analyzed in monitoring；
When occur a phase voltage close to 0 and in addition two-phase voltage be increased to the situation near line voltage when then voltage in transient process
It is failure phase to be reduced to quickly close to 0 separate, alternatively, when three-phase voltage value scope is in the default of the electric power system voltage
During ratio value, then judge the hysteresis of voltage steady-state value highest phase mutually for failure phase.
4. one-phase earthing failure in electric distribution network circuit quick judgment method according to claim 1, it is characterised in that described to incite somebody to action
Bus-bar fault phase high-speed switch closes a floodgate, while monitors the zero-sequence current variation characteristic for analyzing each bar feeder line and branch line head end, root
The step of selecting fault wire according to the variation characteristic of each bar feeder line and the zero-sequence current of branch line specifically includes：
The bus-bar fault that will determine that mutually carries out high-speed switch action and closes a floodgate, and monitors the zero sequence electricity for analyzing each bar feeder line head end
Flow recording；
High-speed switch combined floodgate before, if wherein on a circuit electric current of zero sequence it is opposite with other all circuit zero sequence current directions and
Amplitude is more than All other routes, and before and after the busbar carries out high-speed switch action the zero sequence wherein on a circuit electric current
Direction changes, then can determine whether the circuit is faulty line.
5. a kind of one-phase earthing failure in electric distribution network circuit of electric power system quickly judges system, it is characterised in that including：
Earth fault judgment module, for monitoring PT secondary sides open delta voltage or each feeder line, branch for electric system in real time
The head end zero-sequence current of circuit simultaneously generates monitoring information, and judges whether system occurs single-phase earthing event according to the monitoring information
Barrier；
Failure phase judgment module, for when judging to occur singlephase earth fault, monitoring the displacement voltage state and three of neutral point
The state of phase voltage, and failure phase is determined according to the displacement voltage state of neutral point and the state of three-phase voltage；
Fault wire determining module, when determining failure phase for failure phase judgment module, bus-bar fault phase high-speed switch is closed a floodgate, together
When monitoring analyze the zero-sequence current variation characteristic of each bar feeder line and branch line head end, according to the zero sequence of each bar feeder line and branch line electricity
The variation characteristic of stream selects fault wire.
6. one-phase earthing failure in electric distribution network circuit according to claim 5 quickly judges system, it is characterised in that described to connect
Earth fault judgment module includes：
First earth fault judging unit, for monitoring PT secondary side open delta voltages in real time, presets for open delta voltage
A fixed threshold value, judges that single-phase earthing event occurs for electric power system when the open delta voltage voltage increases to over the threshold value
Barrier；Or/and
Second earth fault judging unit, for when there is the mutation of circuit head end zero-sequence current, monitoring analysis electric power system to be each
Whether the zero sequence current signal of feeder line and branched line undergos mutation in synchronization, if then judging electric power system
Singlephase earth fault.
7. one-phase earthing failure in electric distribution network circuit according to claim 5 quickly judges system, it is characterised in that the event
Barrier phase judgment module includes：
Voltage monitoring unit, for earth fault judgment module judge for electric system as singlephase earth fault after, monitoring analysis
The displacement voltage and three-phase voltage of the neutral point；
Fisrt fault phase judging unit, is connected to when the voltage monitoring unit monitors a phase with the voltage monitoring unit
Voltage close to 0 and in addition two-phase voltage be increased to the situation near line voltage when then judge that the voltage reduces quickly in transient process
To being failure phase close to 0 separate；
Second failure phase judging unit, is connected to when the voltage monitoring unit monitors three-phase with the voltage monitoring unit
In the preset ratio value of the electric power system voltage, then the hysteresis for judging voltage steady-state value highest phase is mutually range of voltage values
Failure phase.
8. one-phase earthing failure in electric distribution network circuit according to claim 5 quickly judges system, it is characterised in that the event
Barrier line determining module includes：
Bus-bar fault processing unit, is closed for the bus-bar fault for hindering the judgement of phase judgment module mutually to be carried out high-speed switch action
Lock, and monitor the zero-sequence current recording for analyzing each bar feeder line head end；
Faulty line determination unit, for bus-bar fault processing unit carry out high-speed switch combined floodgate before, when wherein on a circuit
The electric current of zero sequence is opposite with other all circuit zero sequence current directions and amplitude is more than All other routes, and is carried out in the busbar
When wherein the current direction of zero sequence changes on a circuit described in before and after high-speed switch action, judge the circuit for fault wire
Road.
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| WO2022121779A1 (en) * | 2020-12-12 | 2022-06-16 | 保定钰鑫电气科技有限公司 | Method for processing single-phase grounding |
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