CN108287295A - Power circuit earth fault location lookup method and system - Google Patents
Power circuit earth fault location lookup method and system Download PDFInfo
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- CN108287295A CN108287295A CN201810083323.XA CN201810083323A CN108287295A CN 108287295 A CN108287295 A CN 108287295A CN 201810083323 A CN201810083323 A CN 201810083323A CN 108287295 A CN108287295 A CN 108287295A
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- 238000012360 testing method Methods 0.000 claims abstract description 46
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Classifications
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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 provides a kind of power circuit earth fault location lookup method and systems.This method includes：Substation acquires earth fault information, according to the earth fault information of acquisition, determines the earth fault phase in circuit and three-phase line that power circuit earth fault occurs in station；The breaker of all subscriber's drop switchgears of the identified circuit that breaks down is disconnected successively and whether the interior earth fault that judges to stand disappears.Earth fault position is determined if disappearing in subscriber's drop breaker of switch cabinet line facility below, flow terminates.Abort situation is determined if not disappearing in main line or user's T links of main line, further test finds out earth fault position.The system includes earth fault information collecting device, faulty line and failure phase determining device, analog current sending device, live current testing device and information data processing unit.The present invention is simple, easy to operate, and can quickly and efficiently judge to occur the position of earth fault.
Description
Technical field
The present invention relates to high-voltage electric power circuit power supply trouble detection technique field more particularly to a kind of ground connection events of power circuit
Hinder location lookup method and system.
Background technology
A kind of important power transmission mode of the high-voltage electric power circuit as enterprises and institutions and resident living supply of electric power, power circuit are more
To be powered jointly by power cable and overhead transmission line.In high-tension electricity overhead transmission line, usually due to electric load increase, circuit
Ambient enviroment deteriorates and the variation of the bad weathers such as lightning stroke, strong wind, ice and snow, line cord " T " connect that user is more, user side equipment is former
Reasons, the line single phase grounding failures such as barrier happen occasionally.Although grounding fault method and apparatus are more, such as installing in station
Small Electric Current Earthing And Routing Device, protective device zero-sequence current alert detecting, installation circuit earth-fault indicator etc., but more than
Method and device can only detect faulty line, and cannot dock earth fault position and effectively be detected.Especially neutral point
Earth-free power supply system, the extension of singlephase earth fault easily at any time cause two-phase grounding fault, the expansion to cause the accident,
Jeopardize the safe and reliable operation of power supply system.
The 35kV power circuits of neutral point ungrounded electric network system are mostly single-core cable, compared with three cores unite packet cable, with
The significant advantage that its current-carrying capacity is big, bending radius is small is used widely.The power circuit of neutral point ungrounded electric network system is sent out
It does not trip when raw single-phase dead ground failure, regulation regulation allows ground connection operation to be no more than two hours, but some power supply system lists
Capacitance current is larger when being mutually grounded, and electric arc is not easy to extinguish when ground connection, generates arc grounding over-voltage, earth fault is easily at any time
Extension cause two-phase grounding fault, the expansion to cause the accident.To prevent accident from further expanding, it is ensured that production equipment is just common
Electricity needs, when earth fault occurs for power circuit, to find out earth fault as early as possible and overhauled in time.
Therefore, low for power circuit earth fault search efficiency, abort situation searches that accuracy is poor, makes ground path
It searches time lengthening, easily make this problem of failure propagation, there is an urgent need for a kind of lookup method of power circuit earth fault position and be
System, is grounded the quick lookup of abort situation, cuts off earth fault as early as possible, restores power circuit supply, meets and stablize life
Production requires.
Invention content
The technical problem to be solved in the present invention is to provide a kind of power circuits quickly searched being grounded abort situation
Earth fault location lookup method and system.
In order to solve the above-mentioned technical problem, the invention discloses following technical solutions：
On the one hand, a kind of power circuit earth fault location lookup method is proposed.The power circuit earth fault position is looked into
Method is looked for include the following steps：
Substation acquires earth fault information, according to the earth fault information acquired, determines and earth fault occurs in station
Power circuit in three-phase line which mutually be earth fault phase；
The breaker of all subscriber's drop switchgears of the identified circuit that earth fault occurs is disconnected successively, every time
Disconnect whether the earth fault that a subscriber's drop breaker of switch cabinet is all checked in the substation disappears, it is true if disappearing
Abort situation is determined in the subscriber's drop breaker of switch cabinet line facility below finally disconnected, and event is determined if not disappearing
Hinder position in main line or user's T links of main line.
For above-mentioned power circuit earth fault location lookup method, for the identified circuit institute that earth fault occurs
Band customer charge is the case where double voltage control is powered, and before the breaker for disconnecting subscriber's drop switchgear successively, further includes：
Customer charge cyclization is adjusted to by trouble-free power circuit power supply in double voltage control.
For above-mentioned power circuit earth fault location lookup method, failure is determined if not disappearing if earth fault
Further include following steps after position is user's T links of main line or main line the step of：
The disconnecting switch of each subscriber's drop switchgear both sides on the identified circuit that earth fault occurs is disconnected, and will
The circuit that earth fault occurs turns maintenance by operation, and the cable run load side that switchgear is fed out in earth fault line is grounded
After line electric discharge, hung ground wire is removed；
Current feedback circuit, adjustment electric current hair are installed successively between the threephase cable circuit and ground of the outgoing switchgear
The electric current that raw device is sent out is to current setting value, when sending out setting electric current value for installing current feedback circuit every time, in the feedback
Outlet switch cabinet outlet cable load side tests the current value on threephase cable circuit respectively, to further confirm that live triple line
Which circuit is failure phase line in road；
Current feedback circuit is installed between the earth fault phase line and ground of the outgoing switchgear, adjusts electric current
The electric current that device is sent out is to current setting value；
The current value on threephase cable circuit is tested respectively at identified No. 1 bar that earth fault line occurs, such as
The testing current value of a fruit wherein phase line is setting electric current value and other two phase lines no current values, it is determined that abort situation
Power circuit after No. 1 bar；Determine abort situation in the outgoing switchgear if the equal no current value of three-phase line
Outlet cable is to the cable run between No. 1 bar.
For above-mentioned power circuit earth fault location lookup method, if the testing current value in a wherein phase line is
After setting electric current value and other two phase lines no current values then determine abort situation the circuit after No. 1 bar the step of,
Further include：
It connects in the T of the identified main line that earth fault line occurs and is tested on three-phase line respectively at cable run
Current value, if the testing current value of a wherein phase line is setting electric current value and other two phase lines no current values, really
Determine associate power equipment of the abort situation before user T connects cable run or user's house lead in side disconnecting switch；If three-phase
The equal no current value of circuit, it is determined that abort situation is on No. 1 bar to the main line between current surveyed T contacts or is currently surveyed
The later main line of T contacts and its user side circuit.
For above-mentioned power circuit earth fault location lookup method, there are the feelings of multiple user T links on main line
Under condition, determining abort situation on No. 1 bar to the main line between current surveyed T contacts or after current surveyed T contacts
Further include connecing to test three-phase line at cable run respectively in next user T after the step of main line and its user side circuit
On current value and analyze determining line-to-ground fault position, and so on.
It is true if testing equal no current value if three-phase line for above-mentioned power circuit earth fault location lookup method
Determine main line of the abort situation on No. 1 bar to the main line between current surveyed T contacts or after current surveyed T contacts and
After the step of its user side circuit, further include：
Threephase cable circuit is tested respectively at the identified terminal pole to user side cable that earth fault line occurs
On current value, if the testing current value of a wherein phase line be setting electric current value and other two phase lines no current values,
Then determine that associate power of the abort situation before terminal pole to user side cable run or user's house lead in side disconnecting switch is set
It is standby；Determine abort situation on No. 1 main line between bar and terminal pole if the equal no current value of three-phase line.
For above-mentioned power circuit earth fault location lookup method, earth fault information includes the name of earth fault line
The residual voltage and zero-sequence current of title, failure phase, earthing type and busbar, earth fault line where earth fault
Working value.
On the other hand, a kind of power circuit earth fault location lookup system is proposed.The power circuit earth fault position
Lookup system includes earth fault information collecting device, faulty line and failure phase determining device, analog current sending device, shows
Field current test device and information data processing unit, wherein the earth fault information collecting device and the fault wire
Road is connected with failure phase determining device, and described information data processing equipment mutually determines with the faulty line and failure fill respectively
It sets, the analog current sending device and the live current testing device are connected, wherein
The earth fault information collecting device is used to acquire earth fault information when earth fault occurs for power circuit；
The event that the faulty line and failure phase determining device are used to be acquired according to the earth fault information collecting device
Barrier information analyzed, determine occur power circuit earth fault circuit in three-phase line which mutually be earth fault phase；
The analog current sending device for earth fault line for providing and sending simulation output setting electric current；
The scene current testing device is used for having added the earth fault line of simulated failure electric current to carry out scene by phase
Test；
Described information data processing equipment is analyzed for information data, to from the scene of the live current testing device
Testing current value and analog current sending value from the analog current sending device carry out data analysis, comparison and processing.
For above-mentioned power circuit earth fault location lookup system, the earth fault information includes earth fault line
Title, failure phase, earthing type and busbar, earth fault line where earth fault residual voltage and zero sequence
Electric current working value.
For above-mentioned power circuit earth fault location lookup system, the earth fault information collecting device is using backstage
Control microcomputer and/or Small Electric Current Earthing And Routing Device.
Power circuit earth fault location lookup method and system provided by the invention is simple, easy to operate, and can quickly,
The position for effectively judging to occur earth fault substantially increases the search efficiency of power circuit earth fault position and accurate
Rate shortens power off time, reduces fault harm, mitigates the labor intensity of track walker, cut off earth fault as early as possible, restores
Power circuit is supplied, and power supply reliability is improved, and meets steady production requirement.
Description of the drawings
Attached drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes the embodiment of the present invention
A part is intended only as example and is used for explaining the embodiment of the present invention, do not constitute the improper restriction to the embodiment of the present invention.Attached
In figure：
Fig. 1 is the wiring test chart of power circuit earth fault location lookup system provided by one embodiment of the present invention；
Fig. 2 is the flow chart of power circuit earth fault location lookup method provided by one embodiment of the present invention；
Fig. 3 is the structural schematic diagram of power circuit earth fault location lookup system provided by one embodiment of the present invention.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
And technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention
A part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
The every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
The (if present)s such as term " first ", " second " in specification and claims and above-mentioned attached drawing are to be used for area
Not similar part, without being used to describe specific sequence or precedence.It should be appreciated that the data used in this way are appropriate
In the case of can be interchanged, so that embodiments herein described herein can be real with the sequence other than illustrating herein
It applies.
The lookup method and system of the power circuit earth fault position of the present invention are suitable for that power circuit is single-phase connects completely
Earth fault (i.e. metallic earthing).The lookup method and system of the power circuit earth fault position of the present invention are used for neutral point not
The cable run of the 35kV power circuits of earthing electric network system, the voltage class is mostly single-core cable, electric power of the present invention
The cable run of circuit is 35kV single-core cables.
Fig. 1 is the wiring test chart of power circuit earth fault location lookup system provided by one embodiment of the present invention.
As shown in Figure 1, three-phase line includes A phases, B phases and C phase lines.The main power line exported from substation's outgoing switchgear 100
Road is via No. 1 bar, No. 2 bars ... until terminal pole gives power consumer power supply, in the example depicted in figure 1, the T at No. 9 bars
It connects cable run and accesses the first subscriber's drop switchgear 110, the second use is wired to through cable run at No. 10 bars (terminal pole)
Family incoming line switch cabinet 120.
Fig. 2 is the flow chart of power circuit earth fault location lookup method provided by one embodiment of the present invention.Such as Fig. 1
Shown in Fig. 2, the power circuit earth fault location lookup method of the embodiment includes the following steps：
Step S1, substation acquire earth fault information, according to the earth fault information acquired, determine and are connect in station
The power circuit of earth fault in three-phase line which mutually be earth fault phase.Detailed process is as follows：
Substation acquires the earth fault information of power circuit, and earth fault information may include the name of earth fault line
The residual voltage and zero-sequence current of title, failure phase, earthing type and busbar, earth fault line where earth fault
Working value.In embodiments of the present invention, earth fault line can be directly displayed from the background monitoring microcomputer monitor of substation
The title on road, the three-phase voltage instruction numerical value and zero-sequence current of earth fault time of origin, earth fault line place busbar
Working value.As additionally or alternatively, earth fault line title, ground connection can also be shown by Small Electric Current Earthing And Routing Device
Place busbar, the residual voltage of earth fault line, zero-sequence current working value.Thus, earth fault information collection may be used
Background monitoring microcomputer and/or Small Electric Current Earthing And Routing Device are completed.
For example, by analysis, the event of generation can be determined if following phenomenon occurs in collected earth fault information
Barrier type is the single-phase dead ground failure of power circuit：The secondary open-triangular winding production of the PT of busbar where earth fault line
Raw residual voltage is 100V, and zero-sequence current working value is higher than zero-sequence current setting value；The three-phase voltage of busbar where ground path
In value, earth fault phase voltage is 0, other normal two-phases are upgraded to line voltage.In turn, according to the earth fault information of acquisition, divide
Analysis confirms that single-phase dead ground failure has occurred in certain power circuit, and can determine which is mutually earth fault phase in three-phase line.
Step S2, by the breaker of the incoming line switch cabinet 110 and 120 of upper all users of identified earth fault line
It disconnects successively, whether the earth fault that the breaker of one subscriber's drop switchgear of disconnection is all checked in substation every time disappears.
Determine abort situation in the subscriber's drop breaker of switch cabinet line facility below finally disconnected, flow knot if disappearing
Beam.Determine that abort situation proceeds to step in main line or user's T links of main line, flow if not disappearing
S3.Detailed process is as follows：
The enter line side breaker for disconnecting all users of earth fault line successively, disconnects a subscriber's drop switchgear every time
Breaker all in real time pay close attention to ground path where substation in system earth have it is unchanged, if line-to-ground fault
It disappears, it is determined that earth fault position is in the subscriber's drop breaker of switch cabinet line facility below finally disconnected；If connect
Earth fault there are still, it is determined that line-to-ground fault position is in power circuit main line or the T of user is gone to connect cable and its use
Associate power equipment before the lead-in circuit breaker of family side.
If customer charge is dual power supply, in the enter line side open circuit for disconnecting all users of earth fault line successively
Before the step of device, further include：By the identified circuit institute band customer charge that earth fault occurs, cyclization is adjusted to respectively one by one
It is powered by trouble-free another way power circuit.
Step S3 disconnects 110 and 120 both sides of each subscriber's drop switchgear in the identified circuit that earth fault occurs
Disconnecting switch, and by the circuit of earth fault by operation turn maintenance, feed out the cable run of switchgear in earth fault line
After the grounded line electric discharge of load side, hung ground wire is removed.Detailed process is as follows：
It is each turned off the disconnecting switch of each 110 and 120 both sides of subscriber's drop switchgear of faulty line, and by earth fault line
Routing operation turns maintenance, feeds out the grounded line of cable run load side in switchgear in earth fault line and is filled to power cable
The electric discharge of tap ground, then removes hung ground wire.
Step S4 installs current feedback circuit 101 successively between the threephase cable circuit and ground of outgoing switchgear 100,
The electric current that adjustment current feedback circuit 101 is sent out sends out setting electric current to current setting value for installing current feedback circuit 101 every time
When value, the current value on threephase cable circuit is tested respectively in the outlet cable load side of outgoing switchgear 100, with into one
Step confirms which circuit is failure phase line in live three-phase line.Wherein, current feedback circuit can be ac generator, it is micro-
Machine relay-protection tester or Microcomputer Protection tester can also be other electric currents generation instrument such as transformer for hand lamp.
Assuming that determining that certain feeds out circuit as faulty line and event in station by the background monitoring microcomputer of substation in step S1
Barrier phase line is A phase lines, and electric current is sequentially connected respectively between the threephase cable circuit and ground of outgoing switchgear 100
Fig. 1 may be used to current setting value such as 5A in the conducting wire L and conducting wire N of device 101, the electric current that adjustment current feedback circuit 101 is sent out
Shown in clamp ammeter 102 distinguish cramp joint and measure each phase cable on the threephase cable circuit of outgoing switchgear 100
The current value on road.If clamp ammeter 102, which measures on a wherein cable run, the current value of 5A, and measures it at this time
No current value or current value very little such as 0.1A or so on his two-phase cable circuit then show what current feedback circuit 101 was connect
That phase line is failure phase line, as A phase lines.If the current value that clamp ammeter 102 measures threephase cable circuit is equal
It is zero, then shows that current feedback circuit 101 is connected between any bar circuit and ground in other normal two phase lines.Wherein, with pincers
The circuit that shape ammeter 102 is surveyed is cable run.
Wherein, the setting electric current value debugging that current feedback circuit 101 exports can be set as 5A, can also be 3A or 10A
Deng other suitable current values.
Step S5 installs current feedback circuit 101 between the earth fault phase line and ground of outgoing switchgear 100, adjusts
The electric current that whole current feedback circuit 101 is sent out is to current setting value.Detailed process is as follows：
The back door for opening the outgoing switchgear 100 of earth fault line, connects in the outlet cable of outgoing switchgear 100
The conducting wire L and conducting wire N of current feedback circuit 101 are separately connected between earth fault phase cable connector and ground, adjustment current feedback circuit is defeated
Go out a certain setting electric current value, such as the AC current values of 5A, is added between the tag of earth fault phase and ground, it is defeated always
Go out, and does following test.
Step S6 tests the current value on threephase cable circuit respectively at No. 1 bar of identified earth fault line.
If the testing current value of a wherein phase line is setting electric current value and other two phase lines no current values, it is determined that fault bit
The circuit after No. 1 bar is set, flow proceeds to step S7.If the equal no current value of three-phase line, it is determined that abort situation exists
The outlet cable of outgoing switchgear 100 to the cable run between No. 1 bar, flow terminates.Detailed process is as follows：
By taking current setting value is 5A as an example, clamp ammeter is used respectively at No. 1 bar of identified earth fault line
102 test and record the current value on threephase cable circuit.If measuring a phase cable has the current value and other two-phases of 5A
No current value on cable run is analyzed, it is determined that power circuit of the line-to-ground fault position after No. 1 bar by comparing；
If measuring equal no current value on threephase cable circuit, it is determined that line-to-ground fault position goes out outgoing switchgear 100
Line cable is to the cable run between No. 1 bar.
Step S7 connects in all T of the main line of identified earth fault line and tests three-phase at cable run respectively
Current value on cable run.If wherein the current value of a phase line is setting electric current value and other two phase lines no currents
Value, it is determined that associate power equipment of the abort situation before user T connects cable run or user's house lead in side disconnecting switch, stream
Journey terminates.If the equal no current value of three-phase line, it is determined that abort situation is in No. 1 bar to the main line between current surveyed T contacts
Road or the current later main line of surveyed T contacts and its user side circuit, flow proceed to step S8.Detailed process is such as
Under：
By taking current setting value is 5A as an example, subscribers' line is connect such as in the T of the main line of identified earth fault line
No. 9 bar T shown in Fig. 1 connect at service cable, are tested respectively with clamp ammeter 102 and record the electricity on threephase cable circuit
Flow valuve.If wherein the current value of a phase line is 5A and other two phase lines no current values, analyzed by comparing, it is determined that
Associate power equipment of the line-to-ground fault position before user T connects cable or user's house lead in side disconnecting switch.If surveyed
Obtain equal no current value on threephase cable circuit, it is determined that line-to-ground fault position is in No. 1 bar to the aerial master between the T contacts
On circuit or electric power main line and its user side circuit that the T contacts are later.Here, it refers in No. 1 bar between terminal pole that T, which connects,
Main electric power (aerial) circuit on a certain electricity consumer by cable or overhead line pick out one section of circuit for its equipment power, this section
Circuit is referred to as T links.
In the case where there are multiple T links on main line, determining abort situation in No. 1 bar to current surveyed T contacts
Between aerial main line on or the current later electric power main line of surveyed T contacts and its step of user side circuit after, and also
Include connecing the current value tested respectively at cable run on three-phase line in next T, and analyzed determining line-to-ground fault
Position, and so on.
Step S8, terminal pole (i.e. No. 10 bars shown in Fig. 1) is extremely used in the identified circuit that earth fault occurs
The current value on threephase cable circuit is tested at the cable of family side respectively.If wherein the current value of a phase line is setting electric current value
And other two phase lines no current values, it is determined that abort situation is opened in terminal pole to user side cable run or user isolation
Associate power equipment before pass, flow terminate.If the equal no current value of three-phase line, it is determined that abort situation in No. 1 bar and
On main line between terminal pole, flow terminates.Detailed process is as follows：
By taking current setting value is 5A as an example, at the terminal pole of identified earth fault line 10 shown in i.e. Fig. 1
At number bar to user side cable, is tested respectively with clamp ammeter 102 and record the current value on threephase cable circuit.If surveyed
Obtaining a phase cable has no current value on the current value and other two-phase cable circuits of 5A, passes through to compare and analyze, it is determined that circuit
Correlation of the earth fault position before the enter line side disconnecting switch of terminal pole to user side cable run or No. 10 bar users
Power equipment；If measuring equal no current value on threephase cable circuit, it is determined that line-to-ground fault position is in No. 1 bar to No. 10
Main power overhead network road between bar.
Specifically, be improve trouble shoot efficiency, in practical operation also can in due course according to circuit, load, external environment,
And a certain kind or several situations advanced optimize the sequence of adjustment grounding fault test in the fault message of user's offer.
Fig. 3 is the structural schematic diagram of power circuit earth fault location lookup system provided by one embodiment of the present invention.
As shown in figure 3, the power circuit earth fault location lookup system that the embodiment provides includes earth fault information collecting device
31, faulty line and failure phase determining device 32, analog current sending device 33, live current testing device 34 and information
Data processing equipment 35.Earth fault information collecting device 31 is connected with faulty line and failure phase determining device 32.Information Number
According to processing unit 35 respectively with faulty line and failure phase determining device 32, analog current sending device 33 and live electric current
Test device 34 is connected.
Wherein, earth fault information collecting device 31 is used to acquire earth fault letter when earth fault occurs for power circuit
Breath.
Faulty line and failure phase determining device 32 are used to be believed according to the failure that earth fault information collecting device 31 acquires
Breath analyzed, determine occur power circuit earth fault circuit in three-phase line which mutually be earth fault phase.
Analog current sending device 33 for earth fault line for providing and sending simulation output setting electric current.Simulation electricity
Flow transmitting device 33 may include current feedback circuit 101, and current feedback circuit 101 can be ac generator, microcomputer protective relay
Tester, Microcomputer Protection tester or transformer for hand lamp.When the line outage that earth fault occurs and after be substantially discharged,
Can be by 33 simulation output specific current value of analog current sending device to earth fault phase line, and being set what debugging exported
Constant current value is transmitted to information data processing unit 35.
Live current testing device 34 is used for live by mutually surveying to add the earth fault line of simulated failure electric current to carry out
Examination.When earth fault line adds analog current, the current value measured is transmitted to Information Number by live current testing device 34
According to processing unit 35.Live current testing device 34 may include clamp ammeter 102.
Information data processing unit 35 is analyzed for information data, to the live electric current from live current testing device 34
Test value and analog current sending value from analog current sending device 33 carry out data analysis, comparison and processing.At data
It generally can be central processing unit to manage device.Data processing equipment 35 be separately connected faulty line and failure phase determining device 32,
Analog current sending device 33 and live current testing device 34, by receiving the data of each device transmission and to the data of reception
Analyses and comparison processing is carried out, determines earth fault position.
Specifically, earth fault information collecting device 31 collects earth fault letter when earth fault occurs for power circuit
Breath.Earth fault information collecting device 31 can collect the title of earth fault line, time of failure, earth fault line
Three-phase voltage instruction numerical value, residual voltage, the zero-sequence current working value of busbar where road.It in an embodiment of the present invention, can be with
Busbar where directly displaying line name, earth fault time of origin, earth fault line from background monitoring microcomputer monitor
Three-phase voltage instruction numerical value and zero-sequence current working value.As additionally or alternatively, can also be selected by small current neutral grounding
Busbar, the residual voltage of earth fault line, zero-sequence current action where line apparatus shows earth fault line title, ground connection
Value.Thus, background monitoring microcomputer and/or Small Electric Current Earthing And Routing Device may be used in earth fault information collecting device 31.When
When earth fault occurs for power circuit, background monitoring microcomputer and/or Small Electric Current Earthing And Routing Device are by the fault message number of acquisition
Analyzing processing is carried out according to faulty line and failure phase determining device 32 is transmitted to.
The course of work for the power circuit earth fault location lookup system that the embodiment provides is as follows：
When earth fault occurs for power circuit, earth fault information data collecting device 31 is first to earth fault Information Number
According to being acquired；Fault information data is transmitted to faulty line and failure phase determining device 32 again, by faulty line and failure
Phase determining device 32 determine occur power circuit earth fault circuit in three-phase line which mutually be earth fault phase；Pass through
Analog current sending device 33 sends analog current between earth fault phase line and ground, and will debugging output setting electric current
Value is transmitted to information data processing unit 35；Live current testing device 34 can be to the earth fault line added with analog current
Carry out on-the-spot test；On-the-spot test current value and analog current sending value are carried out analyses and comparison processing by data processing equipment, really
Determine the position of earth fault.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；
And these modifications or replacements, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of power circuit earth fault location lookup method, which is characterized in that this method includes：
Substation acquires earth fault information, according to the earth fault information acquired, determines the electricity that earth fault occurs in station
Line of force road in three-phase line which mutually be earth fault phase；
The breaker of all subscriber's drop switchgears of the identified circuit that earth fault occurs is disconnected successively, is disconnected every time
Whether the earth fault that one subscriber's drop breaker of switch cabinet is all checked in the substation disappears, and event is determined if disappearing
Hinder position in the subscriber's drop breaker of switch cabinet line facility below finally disconnected, fault bit is determined if not disappearing
Set user's T links in main line or main line.
2. power circuit earth fault location lookup method according to claim 1, which is characterized in that for identified
There is a situation where the circuit of earth fault institute band customer charges to power for double voltage control, disconnects subscriber's drop switchgear successively
Breaker before, further include：Customer charge cyclization is adjusted to by trouble-free power circuit power supply in double voltage control.
3. power circuit earth fault location lookup method according to claim 1, which is characterized in that if in ground connection event
Barrier further includes as follows without disappearing after then determining abort situation is user's T links of main line or main line the step of
Step：
The disconnecting switch of each subscriber's drop switchgear both sides on the identified circuit that earth fault occurs is disconnected, and will be occurred
The circuit of earth fault turns maintenance by operation, and the grounded line of cable run load side that switchgear is fed out in earth fault line is put
After electricity, hung ground wire is removed；
Current feedback circuit is installed successively between the threephase cable circuit and ground of the outgoing switchgear, adjusts current feedback circuit
The electric current sent out is to current setting value, when sending out setting electric current value for installing current feedback circuit every time, in the outgoing
Switch cabinet outlet cable load side tests the current value on threephase cable circuit respectively, to further confirm that in live three-phase line
Which circuit is failure phase line；
Current feedback circuit, adjustment current feedback circuit hair are installed between the earth fault phase line and ground of the outgoing switchgear
The electric current gone out is to current setting value；
The current value on threephase cable circuit is tested respectively at identified No. 1 bar that earth fault line occurs, if its
In a phase line testing current value be setting electric current value and other two phase lines no current values, it is determined that abort situation is 1
Number later power circuit of bar；Determine abort situation in the outgoing switch cabinet outlet if the equal no current value of three-phase line
Cable is to the cable run between No. 1 bar.
4. power circuit earth fault location lookup method according to claim 3, which is characterized in that if wherein one
The testing current value of phase line be setting electric current value and other two phase lines no current values then determine abort situation No. 1 bar with
After the step of rear circuit, further include：
The electric current tested respectively at cable run on three-phase line is connect in the T of the identified main line that earth fault line occurs
Value, if the testing current value of a wherein phase line is setting electric current value and other two phase lines no current values, it is determined that therefore
Hinder associate power equipment of the position before user T connects cable run or user's house lead in side disconnecting switch；If three-phase line
Equal no current value, it is determined that abort situation is on No. 1 bar to the main line between current surveyed T contacts or current surveyed T connects
Point later main line and its user side circuit.
5. power circuit earth fault location lookup method according to claim 4, which is characterized in that have on main line
In the case of multiple user T links, determine abort situation on No. 1 bar to the main line between current surveyed T contacts or
Further include connecing cable run in next user T after the step of current later main line of surveyed T contacts and its user side circuit
Locate the current value tested on three-phase line respectively and analyzes determining line-to-ground fault position, and so on.
6. power circuit earth fault location lookup method according to claim 4 or 5, which is characterized in that if three
Phase line tests equal no current value and then determines abort situation on No. 1 bar to the main line between current surveyed T contacts or work as
After the step of later main line of preceding surveyed T contacts and its user side circuit, further include：
It is tested respectively on threephase cable circuit at the identified terminal pole to user side cable that earth fault line occurs
Current value, if the testing current value of a wherein phase line is setting electric current value and other two phase lines no current values, really
Determine associate power equipment of the abort situation before terminal pole to user side cable run or user's house lead in side disconnecting switch；Such as
The equal no current value of fruit three-phase line then determines abort situation on No. 1 main line between bar and terminal pole.
7. power circuit earth fault location lookup method according to claim 1, which is characterized in that earth fault information
Busbar, earth fault line where title, failure phase, earthing type and earth fault including earth fault line
Residual voltage and zero-sequence current working value.
8. a kind of power circuit earth fault location lookup system, which is characterized in that including earth fault information collecting device, event
Hinder circuit and failure phase determining device, analog current sending device, live current testing device and information data processing dress
It sets, wherein the earth fault information collecting device is connected with the faulty line and failure phase determining device, described information number
According to processing unit respectively with the faulty line and failure phase determining device, the analog current sending device and described existing
Field current test device is connected, wherein
The earth fault information collecting device is used to acquire earth fault information when earth fault occurs for power circuit；
The faulty line and failure phase determining device are used to be believed according to the failure that the earth fault information collecting device acquires
Breath analyzed, determine occur power circuit earth fault circuit in three-phase line which mutually be earth fault phase；
The analog current sending device for earth fault line for providing and sending simulation output setting electric current；
The scene current testing device is used for live by mutually testing to add the earth fault line of simulated failure electric current to carry out；
Described information data processing equipment is analyzed for information data, to the live electric current from the live current testing device
Test value and analog current sending value from the analog current sending device carry out data analysis, comparison and processing.
9. power circuit earth fault location lookup system according to claim 8, which is characterized in that the earth fault
Information includes busbar, the earth fault line where the title of earth fault line, failure phase, earthing type and earth fault
The residual voltage and zero-sequence current working value on road.
10. power circuit earth fault location lookup system according to claim 8, which is characterized in that the ground connection event
Hinder information collecting device and uses background monitoring microcomputer and/or Small Electric Current Earthing And Routing Device.
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| CN110568316A (en) * | 2019-10-16 | 2019-12-13 | 国网四川省电力公司绵阳供电公司 | Method for quickly selecting line of ground fault of low-current grounding system |
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