CN108279360A - Singlephase earth fault circuit monitoring system - Google Patents
Singlephase earth fault circuit monitoring system Download PDFInfo
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- CN108279360A CN108279360A CN201810270625.8A CN201810270625A CN108279360A CN 108279360 A CN108279360 A CN 108279360A CN 201810270625 A CN201810270625 A CN 201810270625A CN 108279360 A CN108279360 A CN 108279360A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 59
- 238000012360 testing method Methods 0.000 claims abstract description 67
- 238000004891 communication Methods 0.000 claims description 15
- 230000004224 protection Effects 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000002679 ablation Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention provides a kind of singlephase earth fault circuit monitoring systems.Each zero sequence current mutual inductor is sheathed in substation respectively at the terminal fitting of each feed-out cable circuit in the system.The secondary current side of each zero sequence current mutual inductor is connected on by two connecting terminals in corresponding electric current testing terminal row between the first connecting terminal of the first electric current testing terminal and the first connecting terminal of the second electric current testing terminal, and each first electric current testing terminal is connected on by the first and second connecting terminals of disconnection between two current wiring terminals of corresponding microcomputer protecting controller.Bis- open delta voltages of PT of busbar are connected to Small Electric Current Earthing And Routing Device where each feed-out cable circuit.The present invention can effectively judge the circuit of generation earth fault, improve the search efficiency and accuracy rate of faulty line.
Description
Technical field
The present invention relates to electric system of neutral-piont earth free fault diagnosis processing technology field, more particularly to a kind of single-phase connect
Earth fault circuit monitoring system.
Background technology
In electric system of neutral-piont earth free, power supply feeds out line single phase grounding failure and happens occasionally, when supply line goes out
When existing singlephase earth fault, the phase voltage of other normal two-phases will be caused to increase, very big threat constituted to the insulation performance of system,
Easily cause two-phase grounding fault accident, therefore, it is necessary to find faulty line rapidly and excluded.Singlephase earth fault circuit
Confirm and is generally carried out using the method for circuit got power outage road method one by one and installing Small Electric Current Earthing And Routing Device failure line selection.
Circuit got power outage path method falls behind one by one, influences power supply reliability, has now been gradually backed out use mostly.
Currently, when singlephase earth fault is handled, obtained by the method that Small Electric Current Earthing And Routing Device carries out failure line selection
Extensive use.Fig. 1 is a kind of structural schematic diagram of the singlephase earth fault circuit monitoring system for prior art that example provides,
Wherein illustrated by taking a zero sequence current mutual inductor as an example.As shown in Figure 1, conventional is filled by small current earthing wire-selecting
Set monitoring, the system of lookup singlephase earth fault is mutual in outgoing switch cabinet outlet cable terminal position installation zero-sequence current
Zero sequence secondary current is wired to the current terminal row 2 that cabinet door top controls cabinet door, then is connect through controlling cable by sensor TA3
Line is to Small Electric Current Earthing And Routing Device 1；The residual voltage of Small Electric Current Earthing And Routing Device 1 is picked up from voltage transformer (PT：
Potential transformer) open-triangular winding 4 secondary open delta voltage, pass through the zero-sequence current of faulty line
The residual voltage come with PT open delta voltages is set with the current protection setting value of Small Electric Current Earthing And Routing Device 1 and voltage protection
Definite value is compared judgement, to which which feeder line for filtering out earth fault line place busbar and busbar distinguished,
And send out sound-light alarm and text importing.
But Small Electric Current Earthing And Routing Device existing defects, route selection criterion is insufficient, does not adapt to the ground connection of various complexity
Fault type cannot accurately extract useful information, the selection of some zero sequence current mutual inductor transformer ratios not from faint signal
Properly, the factors such as Small Electric Current Earthing And Routing Device self deterioration failure all can make Small Electric Current Earthing And Routing Device complete
Accurate advance notice ground signalling is reported by mistake, refuses to submit and happen occasionally, and it is very high to cause route selection accuracy rate not.
In addition, in order to reduce investment outlay and based on the considerations of outgoing in route protection selective ablation, many distribution systems
Switchgear installs two current transformer (CT mostly：Current transformer), access of microcomputer protecting controller
Have a biphase current, thus microcomputer protecting controller can not self-produced zero sequence secondary current, also zero sequence secondary current can not just be led to
Communications are crossed to background monitoring microcomputer and a distant place, can not achieve background monitoring microcomputer and the grounding alarm monitoring function in a distant place.
Invention content
The secondary zero-sequence current of zero sequence current mutual inductor is gone here and there successively the technical problem to be solved in the present invention is to provide a kind of
Microcomputer protecting controller and Small Electric Current Earthing And Routing Device are accessed, singlephase earth fault is monitored jointly to realize stream oriented device
The monitoring system of circuit.
In order to solve the above-mentioned technical problem, the invention discloses following technical solutions：
It is proposed a kind of singlephase earth fault circuit monitoring system.The singlephase earth fault circuit monitoring system includes multiple zero
Sequence current transformer, each zero sequence current mutual inductor are sheathed on the terminal of each feed-out cable circuit of busbar in substation respectively
Joint, further include Small Electric Current Earthing And Routing Device and with each feed-out cable circuit multiple current testings correspondingly
Terminal block and multiple microcomputer protecting controllers,
The secondary current side of each zero sequence current mutual inductor is connected on corresponding electric current by two connecting terminals and tries
It tests between the first connecting terminal of the first electric current testing terminal in terminal block and the first connecting terminal of the second electric current testing terminal,
Each first electric current testing terminal is connected on corresponding digital relay and monitoring by the first and second connecting terminals of disconnection
Between two current wiring terminals of device, the second connecting terminal of the first electric current testing terminal in each electric current testing terminal row
The second connecting terminal with the second electric current testing terminal and corresponding two electric current wiring on Small Electric Current Earthing And Routing Device
Terminal, which corresponds, to be connected, and is connected between the first and second connecting terminals of each second electric current testing terminal；
Small Electric Current Earthing And Routing Device also with the voltage transformer of each affiliated busbar of feed-out cable circuit in substation
The secondary voltage circuit of open-triangular winding is connected.
Above-mentioned singlephase earth fault circuit monitoring system further includes communication processor and background monitoring machine, multiple Microcomputer Protections
Measure and control device is connected to background monitoring machine through communication line by communication processor.
For above-mentioned singlephase earth fault circuit monitoring system, according to load capacity, earthing capacitance current size and zero
The no-load voltage ratio size of sequence current transformer calculates zero sequence second protection electric current and acts setting value, right on microcomputer protecting controller
Zero sequence second protection current setting value and alarm time limit value are set and are put into operation.
For above-mentioned singlephase earth fault circuit monitoring system, the secondary current side and second of each zero sequence current mutual inductor
The connected connecting terminal ground connection of first connecting terminal of electric current testing terminal.
For above-mentioned singlephase earth fault circuit monitoring system, the first connecting terminal of the first electric current testing terminal includes connecing
Two logical connecting terminals.
For above-mentioned singlephase earth fault circuit monitoring system, the second connecting terminal of the first electric current testing terminal includes connecing
Two logical connecting terminals.
For above-mentioned singlephase earth fault circuit monitoring system, the first connecting terminal of the second electric current testing terminal includes connecing
Two logical connecting terminals.
For above-mentioned singlephase earth fault circuit monitoring system, the second connecting terminal of the second electric current testing terminal includes connecing
Two logical connecting terminals.
For above-mentioned singlephase earth fault circuit monitoring system, two connecting terminals of the connection pass through metal connecting sheet
It connects.
For above-mentioned singlephase earth fault circuit monitoring system, the electric current testing terminal in electric current testing terminal row is that band tries
Test the current wiring terminal of function.
The major advantage of technical solution of the present invention is as follows：
Singlephase earth fault circuit monitoring system provided by the invention can effectively judge that the line of earth fault occurs
Road, avoid the Small Electric Current Earthing And Routing Device caused by various possible causes during application practice existing for such as miss
It reports, refuse to submit, the problems such as earthing wire-selecting alarm reliability is poor, greatly improving the search efficiency and accuracy rate of faulty line, shortening stops
The electric time mitigates the labor intensity of track walker, cuts off earth fault as early as possible, restores power circuit supply, improving power supply can
By property.
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 a kind of structural schematic diagram of the singlephase earth fault circuit monitoring system for prior art that example provides；
Fig. 2 is the structural schematic diagram of singlephase earth fault circuit monitoring 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.
Singlephase earth fault circuit monitoring system provided by the invention is suitable for the electric power of neutral point ungrounded electric network system
Circuit.Since electric load increases, circuit ambient enviroment deteriorates, user's side equipment fault and thunder and lightning, strong wind, ice and snow etc. are severe
The reason of Changes in weather, neutral point ungrounded electric network system power supply circuit occur singlephase earth fault, jeopardize power circuit often
Safe and reliable operation.It should be noted that single-phase dead ground failure occurs for the power circuit of neutral point ungrounded electric network system
When do not trip, regulation regulation allow ground connection operation be no more than two hours, but when some power supply system single-phase earthings capacitance current compared with
Greatly, the extension of earth fault easily at any time causes two-phase grounding fault, the expansion to cause the accident.To prevent accident from further expanding
Greatly, it is ensured that production equipment normal electricity consumption needs, when earth fault occurs for power circuit, to find out earth fault line as early as possible,
And then it searches, eliminate earth fault.
On the one hand, as shown in Figure 1, the lookup system of traditional earth fault line be will come from busbar PT open deltas around
Residual voltage 3U at group0The zero sequence secondary current 3I generated with the zero sequence CT of each outgoing cabinet cable terminal0It is transmitted to small electricity
Flow line-selected earthing device 1.By small current neutral grounding automatic route selection function, when encountering line-to-ground fault, small current neutral grounding choosing
Line apparatus 1 can distinguish earth fault place by judgement, analysis to faulty line zero-sequence current and PT open delta voltages
Which of busbar and busbar feeder line, and send out sound-light alarm, can be grounded faulty line quick lookup and
Processing.But the selection of the transformer ratio of zero sequence current mutual inductor is improper, power supply system single-phase-to-ground current is not of uniform size, cannot
Adapting to the factors such as earth fault type, poor sensitivity, the device self deterioration failure of various complexity leads to small current neutral grounding
There is wrong report, refuses to submit in route selection, and causes route selection accuracy rate relatively low, influences the lookup of singlephase earth fault.
On the other hand, in order to reduce investment outlay and be presented based on the considerations of in route protection selective ablation, many distribution systems
Outlet switch cabinet installs two current transformers (CT) mostly, accesses the only biphase current of microcomputer protecting controller, therefore
Microcomputer protecting controller can not self-produced zero sequence secondary current, also just can not by zero sequence secondary current pass through communications to backstage
Control microcomputer and a distant place can not achieve background monitoring microcomputer and the grounding alarm monitoring function in a distant place.
For the above both sides defect, the present invention is mainly to solve outgoing switchgear installing biphase current mutual inductor
Distribution system occur power circuit singlephase earth fault when a variety of causes caused by merely rely on Small Electric Current Earthing And Routing Device into
Row earth fault judges the problem of poor reliability such as searching existing wrong report or refuse to submit.The present invention will be opened by electric current testing terminal
Close what the zero sequence current mutual inductor being set at the terminal fitting of each feed-out cable circuit of cabinet was generated when earth fault occurs for circuit
Zero sequence secondary current, accesses the zero sequence secondary current connecting terminal of microcomputer protecting controller, then is communicated successively through communication access
Supervisor is ultimately transmitted background monitoring machine, realizes microcomputer protecting controller and the grounding monitor alarm work(of background monitoring machine
Can, it can realize the monitoring to singlephase earth fault circuit and alarm jointly with Small Electric Current Earthing And Routing Device.
Fig. 2 is the structural schematic diagram of singlephase earth fault circuit monitoring system provided by one embodiment of the present invention, wherein
It is illustrated by taking a zero sequence current mutual inductor as an example.As shown in Fig. 2, the singlephase earth fault circuit that the embodiment provides
Monitoring system includes multiple zero sequence current mutual inductors, and each zero sequence current mutual inductor is sheathed on each item of busbar in substation respectively
At the terminal fitting of feed-out cable circuit.The singlephase earth fault circuit monitoring system of the embodiment further includes small current neutral grounding choosing
Line apparatus 1, and multiple electric current testing terminals arrange 5 and multiple digital relay and monitorings correspondingly with each feed-out cable circuit
Device 6.The secondary current side of each zero sequence current mutual inductor TA3 is connected on corresponding by two connecting terminals K1 and K2
First connecting terminal L431 of the first electric current testing terminal and the first of the second electric current testing terminal connect in electric current testing terminal row 5
Between line terminals N431, wherein each first electric current testing terminal is connected by the first connecting terminal L431 and the second connecting terminal
Between two zero sequence secondary current connecting terminals 1n13 and 1n14 of corresponding microcomputer protecting controller 6, Ge Ge electricity
Flow the second connecting terminal of the first electric current testing terminal and the second connecting terminal of the second electric current testing terminal in testing terminal row 5
It is connected with corresponding two current wiring terminals CT1* and CT1 one-to-one correspondence on Small Electric Current Earthing And Routing Device 1.Wherein,
First connecting terminal L431 of each first electric current testing terminal and separated, each second current testing of the second connecting terminal
It is connected between first connecting terminal N431 of terminal and the second connecting terminal.First terminals of each first electric current testing terminal
Sub- L431 and the second connecting terminal can be connected by conducting connecting part, disconnect the conducting connecting part connected therebetween i.e. so that first
Connecting terminal L431 and the second connecting terminal disconnect.Wherein, conducting connecting part can be slidably metal connecting sheet, can both connect
It connects, can also disconnect.
Voltage transformer of the Small Electric Current Earthing And Routing Device 1 also with each affiliated busbar of feed-out cable circuit in substation
(PT) secondary voltage circuit of open-triangular winding is connected.
In this embodiment, electric current testing terminal row 5 is located at the cabinet door top control cabinet door of outgoing switchgear.Its
In, the electric current testing terminal in electric current testing terminal row 5 is the current wiring terminal of girdle tests function.
First connecting terminal L431 of the first electric current testing terminal may include connect two connecting terminals, the two of connection
A connecting terminal can be connected to by conducting connecting part such as metal connecting sheet, a terminals in two connecting terminals of connection
One connecting terminal K1 for electric current output of the secondary current side of the first zero sequence current mutual inductor TA3 of son connection, another
One of connecting terminal connected with computer protection supervisory equipment 6 is used for the zero sequence secondary current connecting terminal 1n13 of electric current input.The
Second connecting terminal of one electric current testing terminal can also include two connecting terminals connected, and two connecting terminals of connection can
To be connected by conducting connecting part such as metal connecting sheet, a connecting terminal connected with computer is protected in two connecting terminals of connection
A zero sequence secondary current connecting terminal 1n14 for electric current output of measure and control device 6 is protected, the connection of another connecting terminal is small
One of current earthing line selection apparatus 1 is used for the current wiring terminal CT1* of electric current input.Similarly, the second electric current testing terminal
The first connecting terminal N431 may include connect two connecting terminals, the second connecting terminal of the second electric current testing terminal
May include two connecting terminals connected.
The singlephase earth fault circuit monitoring system of the embodiment can also include communication processor 7 and background monitoring machine 8,
Multiple microcomputer protecting controllers 6 are connected to background monitoring machine 8 by communication line via communication processor 7.
According to the no-load voltage ratio size of load capacity, earthing capacitance current size and zero sequence current mutual inductor, zero sequence two is calculated
Secondary protective current acts setting value, to zero sequence second protection current setting value and alarm time limit on microcomputer protecting controller 6
Value is set and is put into operation, and time limit value of alarming as needed generally can be set as 10s or so.Microcomputer protecting controller 6
The supply voltage KM of DC power supply is preferably 220V.When generation power supply feeds out line single phase grounding failure, background monitoring machine 8 is with text
The form of word and acousto-optic sends out grounding alarm information.Under normal operation, can also in itself it be looked into from microcomputer protecting controller 6
See 8 real time inspection zero sequence primary current actual motion value of zero sequence secondary current actual motion value and/or background monitoring machine.
The secondary current side of each zero sequence current mutual inductor TA3 and the first connecting terminal N431 of the second electric current testing terminal
Connected connecting terminal ground connection, i.e., the connecting terminal K2 of the secondary current side of each zero sequence current mutual inductor TA3 are reliably protected
Shield ground connection.
Assuming that single-phase earthing event occurs for the cable run in neutral point ungrounded electric network where a zero sequence current mutual inductor
Barrier, the zero sequence current mutual inductor of the faulty line just generate larger zero sequence secondary current, and zero sequence secondary current is through electric current wiring
Terminal K1 is wired to first of the first electric current testing terminal in the special electric current testing terminal row 5 of cabinet door top control cabinet door
(metal between the first connecting terminal L431 and the second connecting terminal of the first electric current testing terminal connects connecting terminal L431 before
Contact pin has disconnected), the zero-sequence current connecting terminal 1n13 of first connecting wire to microcomputer protecting controller 6 is surveyed through Microcomputer Protection
After controlling 6 back panel wiring of device, then by zero-sequence current connecting terminal 1n14 the first current testings of connection of microcomputer protecting controller 6
Second connecting terminal of terminal, finally wiring enters the zero sequence secondary current connecting terminal of Small Electric Current Earthing And Routing Device 1 again
CT1*, the back panel wiring through Small Electric Current Earthing And Routing Device 1, then the connecting terminal CT1 outputs by Small Electric Current Earthing And Routing Device 1
The second connecting terminal of the second electric current testing terminal of electric current testing terminal row 5 is connected, the second of the second electric current testing terminal connects
Line terminals connect the first connecting terminal N431, finally flow back into the electric current wiring of the secondary side of zero sequence secondary current mutual inductor TA3
Terminal K2, and be grounded.
The setting value of Small Electric Current Earthing And Routing Device is：Under normal circumstances, residual voltage 3U030V is can be set as, also may be used
To be set as needed as 15V.When the zero sequence current mutual inductor electric current no-load voltage ratio K of each feed-out cable circuit is for example unanimously
When 50/1, the electric current no-load voltage ratio K of the zero sequence current mutual inductor of each feed-out cable circuit can unite on Small Electric Current Earthing And Routing Device
One is set as 50, such as zero sequence secondary current 3I0According to power system capacity size, (size of power system capacity determines earthing capacitance current
The size of value) etc. actual conditions be set as 50mA.If the electricity of each zero sequence current mutual inductor on each feed-out cable circuit
Rheology ratio K is different, need to input zero-sequence current respectively and become ratio and zero sequence secondary current setting value.Small Electric Current Earthing And Routing Device
Upper delay can be set as needed as 2s or 5s.
Therefore, under normal circumstances, when singlephase earth fault occurs for neutral point ungrounded electric network, meet grounding alarm setting
When condition, both route selection, alarm can be carried out to ground connection barrier circuit by Small Electric Current Earthing And Routing Device 1；Meanwhile when meeting zero sequence
Secondary current is prescribed a time limit when protecting setting value and alarm, and can be by microcomputer protecting controller 6 and communication processor 7, by this
Switching value is opened is transmitted to background monitoring machine 8 into information, and grounding alarm information is sent out in the form of word and acousto-optic.It can certainly
Under normal circumstances, zero sequence secondary current actual motion value and/or background monitoring are checked by microcomputer protecting controller 6 in itself
8 real time inspection zero sequence primary current actual motion value of machine makes reference for malfunction elimination.
Therefore, operation and service personnel can be by checking that the zero sequence primary current of each circuit of background monitoring machine 8 acts
Zero sequence secondary current value on alarming value or microcomputer protecting controller 6, to analyze and determine confirmation earth fault line.
The zero sequence secondary current of zero sequence current mutual inductor first accesses Microcomputer Protection through special electric current testing terminal series wiring
Measure and control device 6, finally wiring enters the zero sequence secondary current circuit of Small Electric Current Earthing And Routing Device 1 again, and is protected by microcomputer
The communication system of shield measure and control device 6 opens the zero sequence secondary current switching value of zero sequence current mutual inductor reality output real-time into signal
It is transmitted to communication processor 7, finally to background monitoring machine 8.
When generation power supply feeds out line single phase grounding failure, background monitoring machine 8 sends out ground connection in the form of word and acousto-optic
Warning message, singlephase earth fault circuit monitoring system provided by the invention can effectively judge that the line of earth fault occurs
Road, avoid the Small Electric Current Earthing And Routing Device 1 caused by various possible causes during application practice existing for such as miss
It reports, refuse to submit, the technological deficiencies such as earthing wire-selecting alarm reliability difference, greatly improving the search efficiency and accuracy rate of faulty line, contracting
Short power off time mitigates the labor intensity of track walker, cuts off earth fault as early as possible, restores power circuit supply, improves and supply
Electric reliability.
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 singlephase earth fault circuit monitoring system, which is characterized in that including multiple zero sequence current mutual inductors, each zero sequence
Current transformer is sheathed in substation respectively at the terminal fitting of each feed-out cable circuit of busbar, further includes that low current connects
Ground line selection apparatus (1) and with each feed-out cable circuit multiple electric current testing terminals row (5) and multiple microcomputers correspondingly
Protection supervisory equipment (6),
The secondary current side of each zero sequence current mutual inductor (TA3) is connected on respective correspondence by two connecting terminals (K1 and K2)
Electric current testing terminal row (5) in the first electric current testing terminal the first connecting terminal (L431) and the second electric current testing terminal
Between first connecting terminal (N431), each first electric current testing terminal is connected on by the first and second connecting terminals of disconnection
Between two current wiring terminals (1n13 and 1n14) of corresponding microcomputer protecting controller (6), each current testing
In terminal block (5) the second connecting terminal of the second connecting terminal of the first electric current testing terminal and the second electric current testing terminal with it is small
Upper corresponding two current wiring terminals (CT1* and CT1) of current earthing line selection apparatus (1), which correspond, to be connected, Ge Ge
It is connected between first and second connecting terminals of two electric current testing terminals；
Small Electric Current Earthing And Routing Device (1) is also opened with the voltage transformer of each affiliated busbar of feed-out cable circuit in substation
The secondary voltage circuit of mouth triangle winding is connected.
2. singlephase earth fault circuit monitoring system according to claim 1, which is characterized in that further include communication processor
(7) backstage is connected to by communication processor (7) through communication line and is supervised with background monitoring machine (8), multiple microcomputer protecting controllers (6)
Control machine (8).
3. singlephase earth fault circuit monitoring system according to claim 1 or 2, which is characterized in that according to load capacity,
The no-load voltage ratio size of earthing capacitance current size and zero sequence current mutual inductor calculates zero sequence second protection electric current and acts setting value,
Zero sequence second protection current setting value and alarm time limit value are set and put into operation on microcomputer protecting controller (6).
4. singlephase earth fault circuit monitoring system according to claim 1 or 2, which is characterized in that each zero-sequence current
The connecting terminal that the secondary current side of mutual inductor (TA3) is connected with the first connecting terminal (N431) of the second electric current testing terminal connects
Ground.
5. singlephase earth fault circuit monitoring system according to claim 1, which is characterized in that the first electric current testing terminal
The first connecting terminal (L431) include connect two connecting terminals.
6. singlephase earth fault circuit monitoring system according to claim 1, which is characterized in that the first electric current testing terminal
The second connecting terminal include connect two connecting terminals.
7. singlephase earth fault circuit monitoring system according to claim 1, which is characterized in that the second electric current testing terminal
The first connecting terminal (N431) include connect two connecting terminals.
8. singlephase earth fault circuit monitoring system according to claim 1, which is characterized in that the second electric current testing terminal
The second connecting terminal include connect two connecting terminals.
9. the singlephase earth fault circuit monitoring system according to any one of claim 5-8, which is characterized in that described to connect
Two logical connecting terminals are connected by metal connecting sheet.
10. singlephase earth fault circuit monitoring system according to claim 1, which is characterized in that electric current testing terminal is arranged
(5) electric current testing terminal in is the current wiring terminal of girdle tests function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810270625.8A CN108279360B (en) | 2018-03-29 | 2018-03-29 | Single-phase earth fault line monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810270625.8A CN108279360B (en) | 2018-03-29 | 2018-03-29 | Single-phase earth fault line monitoring system |
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| Publication Number | Publication Date |
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| CN108279360A true CN108279360A (en) | 2018-07-13 |
| CN108279360B CN108279360B (en) | 2024-07-23 |
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| CN201810270625.8A Active CN108279360B (en) | 2018-03-29 | 2018-03-29 | Single-phase earth fault line monitoring system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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