CN110460025A - Quick method and device thereof of unlinking - Google Patents
Quick method and device thereof of unlinking Download PDFInfo
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- CN110460025A CN110460025A CN201910753167.8A CN201910753167A CN110460025A CN 110460025 A CN110460025 A CN 110460025A CN 201910753167 A CN201910753167 A CN 201910753167A CN 110460025 A CN110460025 A CN 110460025A
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- bus
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- unlinking
- mother
- tripping
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
A kind of method and device thereof of quickly unlinking, are applied to double loop connection wire power system.Method includes the following steps: S1, device acquisition busbar voltage and bus connection switch electric current, acquire bus bar side disconnecting link position signal, contact point signal is received；S2, when substation is in double loop looped network paired running state, logic is in investment state after device is charged；S3, device starting are opened after contact receives signal, judge mother fault current direction discernment fault bus immediately, and after voltage blocking differentiates, all paired running line switchings on instantaneous tripping fault bus；After S4, bus connection switch tripping, bus where Judging fault element, and completely on the corresponding bus of tripping paired running line switching, total used time of this process should be less than the time difference of main transformer tripping bus connection switch and main transformer switch.The present invention can be achieved quickly to unlink, and accident range is avoided to expand, and improve power grid power supply reliability.
Description
Technical field
The present invention relates to a kind of method and device thereof of quickly unlinking of substation applied to loop-net operation mode.
Background technique
For the conveying capacity for improving power grid, more and more power grids use the double loop mode of connection, that is, use double loop two
The ring connection method of operation that side line way switch and two sides bus connection switch put into operation is, it can be achieved that load is evenly distributed, reduced
Line loss, and improve power supply reliability.
But for the substation of loop-net operation mode, when there are the trippings of circuit branch road breaker or protection for source substation
When tripping, even if our station main transformer backup protection tripping bus connection switch, double loop passes through the mother of other end substation paired running
Switch forms outer mother of standing, and can still result in our station non-faulting side bus and is continuously in malfunction, and accident range is be easy to cause to expand
Greatly, it can lead to no-voltage of entire station when serious.
Summary of the invention
One of the objects of the present invention is to provide one kind to be directed to double loop loop-net operation (interior mother of being missed the stop, outer mother of standing
Form looped network) substation line-breaker refuse to jump or relay fail after, the double back of bus where faster trip faulty line
Line branch switch realizes the method for quickly unlinking quickly unlinked.
Another object of the present invention is to provide one kind to be directed to double loop loop-net operation (interior mother of being missed the stop, outer mother of standing
Form looped network) substation line-breaker refuse to jump or relay fail after, the double back of bus where faster trip faulty line
Line branch switch realizes the quick solution loop device quickly to unlink.
The purpose of the present invention can be achieved, and design a kind of method of quickly unlinking, be applied to double loop connection wire power system
System, comprising the following steps:
S1, quickly solution loop device acquires two sections of busbar voltages and bus connection switch electric current, acquires the bus side tool of line segregation
Gate position signal, starting, which is opened, receives the contact point signal from main transformer protection tripping bus connection switch into contact；
S2, when substation is in double loop loop-net operation state, device charges, after charging complete logic be in throw
Enter state；
S3, quickly the starting of solution loop device opens and receives the contact point signal from main transformer protection tripping bus connection switch into contact
Afterwards, the fault current direction before judging bus connection switch tripping immediately if being directed toward II section of bus by I section of bus, and is closed through overvoltage
After lock differentiates, all paired running line switchings on II section of bus of instantaneous tripping；If being directed toward I section of bus, and closed through overvoltage
After lock differentiates, paired running line switching all on I section of bus is instantaneously jumped；
After S4, bus connection switch tripping, bus where Judging fault element, and transported side by side on the corresponding bus of tripping completely
Capable line switching, total used time of this process should be less than the time difference of main transformer tripping bus connection switch and main transformer switch.
Further, bus connection switch paired running, bus have pressure, then quickly unlink by 10s delay charged；Quickly solution
After ring is charged, if there is following either condition: maintenance, mother fanout operation, mother CT broken string, bus PT broken string, bus lose
Pressure, branch disconnecting link is abnormal, movement of quickly unlinking, then electric discharge of quickly unlinking.
Further, it quickly unlinks after charging complete, if the movement of mother zero-sequence current positive direction overcurrent or A, B, C phase
After any phase positive direction overcurrent movement of electric current, receives outside of quickly unlinking and start switch signal, then delay quick solution by fixation
The movement of Huantiao mother's I branch, cuts the double loop branch switch for hanging I mother；If mother zero-sequence current negative direction overcurrent movement or
After any phase negative direction overcurrent movement of A, B, C phase current, receives outside of quickly unlinking and start switch signal, then delayed by fixation
Quickly solution Huantiao mother II branch movement, cuts the double loop branch switch for hanging II mother.
Further, zero-sequence direction component positive direction criterion are as follows:
In formula, 3U0For residual voltage, 3I0For zero-sequence current,For zero sequence fineness angle, the present invention is cured as 80 °.
Further, current direction element uses 90 ° of wiring, three-phase directional element positive direction criterion are as follows:
In formula, UrAnd IrFor the voltage and current of three-phase directional element；
Corresponding relationship under 90 ° of wiring are as follows: Ubc → Ia/Uca → Ib/Uab → Ic,For directional element fineness angle, the present invention
In be set as 45 °.
Further, process flow be initialization process, major cycle process and interrupt process, wherein initialization process,
Major cycle process is that sequence executes, and major cycle process can be interrupted by interrupting process.
Further, initialization process is that sequence executes process, is only executed after device powers on once, for realizing:
Mode is initial when the initialization of CPU and peripheral hardware, the reading initialization of all kinds of parameters and self-test, logout initialization, school
Change；
Major cycle process is that sequence circulation executes process, and major cycle task can be interrupted tasks interrupt, when interrupt task is held
After row, major cycle task is then executed；For realizing: definite value, parameter, configuration circulation self-test；The circulation of link transmit-receive
Check processing and memory scanning；The management bus communication of each plate is handled in major cycle, and manages bus message data
Transmission order then interrupt service in assign；
Process is interrupted to include message reception/processing, definite value area/Parameter analysis of electrochemical area update and self-test, platform public algorithm, protect
Shield logic module, copy component logo area to global flag area, is outputed element and is summarized and self-test, DBus number logout processing
It is incorporated into according to this plate data using area, the LVDS output real-time recording in the area KO, RAM, relay protective scheme module is interrupted in protection component
Middle calling.
Further, relay protective scheme component includes that parameter obtains, frequency anomaly detects, CT burn out detection, current break
Amount starting detection, memory voltage obtain, press open condition detection, disconnecting link position correction, phase current walking direction, zero-sequence current again
The modules such as walking direction, discharging condition detection, charge condition detection and relay protective scheme.
Another object of the present invention can be achieved, and design a kind of quickly solution loop device, including system hardware framework, be
System hardware structure include CPU board, exchange plate, muti-piece open into/output plate, power panel, management bus, data/address bus, power bus；
CPU board receives user key-press order, can receive open into/output the signal of plate, and response processing is carried out to it；CPU
Network interface is arranged in plate, can direct-connected interchanger progress external communication；
Exchange plate is responsible for the acquisition of of ac, and the data of acquisition are stored to A/D chip；
Open into/output plate, including non-electric quantity open into acquisition, after the order for receiving CPU board, drive corresponding relay
Device, execution outlet；
Power panel provides working power by power bus for each plate；
Data are transmitted through data bus transmission, and order is transmitted through management bus transfer.
Further, it is equipped with front panel, front panel is equipped with display device and data input device.
Compared with prior art, the present invention is not under the premise of changing system operation mode and relaying configuration, it can be achieved that double
The substation of loop line loop-net operation is when line-breaker refuses jump or relay fail, after main transformer backup protection tripping our station mother,
By collecting dependent failure information, the double loop branch switch realization of bus where faster trip faulty line is quickly unlinked, and is kept away
Exempt from the expansion of accident range.
Detailed description of the invention
Fig. 1 is the 220kV double loop system main wiring diagram of present pre-ferred embodiments；
Fig. 2 is the logic chart that quickly unlinks of present pre-ferred embodiments；
Fig. 3 is the hardware typical architecture schematic diagram of present pre-ferred embodiments；
Fig. 4 is the processing flow schematic diagram of present pre-ferred embodiments；
Fig. 5 is the relay protective scheme assembly module schematic diagram of present pre-ferred embodiments.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples:
As shown in Figure 1, the 110kV bus of typical case's 220kV double loop system main electrical scheme, 220kV and the above substation is usual
Using single mother partition or double-bus, more with outlet, the double loop of paired running generally by different bussed supplies, is generallyd use
Odd numbers numbering device hangs I sections of buses, and even numbers numbering device hangs the standard method of operation of II sections of buses operation, and A-wire is hung in this example
I is female, and second line hangs II mother, and C-wire hangs I mother, and it is female that fourth line hangs II.
A kind of method of quickly unlinking, is applied to double loop connection wire power system, comprising the following steps:
S1, quickly solution loop device acquires two sections of busbar voltages and bus connection switch electric current, acquires the bus side tool of line segregation
Gate position signal, starting, which is opened, receives the contact point signal from main transformer protection tripping bus connection switch into contact；
S2, when double loop loop-net operation substation is in normal operating condition, device charges, and patrols after charging complete
It collects and is in investment state；
S3, quickly the starting of solution loop device opens and receives the contact point signal from main transformer protection tripping bus connection switch into contact
Afterwards, the fault current direction before judging bus connection switch tripping immediately if being directed toward II section of bus by I section of bus, and is closed through overvoltage
After lock differentiates, all paired running line switchings on II section of bus of instantaneous tripping；If being directed toward I section of bus, and closed through overvoltage
After lock differentiates, paired running line switching all on I section of bus is instantaneously jumped；
After S4, bus connection switch tripping, bus where Judging fault element, and transported side by side on the corresponding bus of tripping completely
Capable line switching, total used time of this process should be less than the time difference of main transformer tripping bus connection switch and main transformer switch.
As shown in Figure 1, this side line road relay fail when C-wire line failure, main transformer backup protection tripping mother 100
Switch, due to reaching in the presence of outer mother of standing, delay is differential, and the two main transformer sides equal tripping 110kV switches lead to the side 110kV whole station
Decompression.
As shown in Figure 1, it is positive direction that mother electric current, which flows to mother I by mother II,.
As shown in Fig. 2, when operating condition meets: bus connection switch paired running (bus connection switch is in coincidence or has stream), it is female
Line has pressure, then quickly unlinks by 10s delay charged；After charging, logic is in investment state.It quickly unlinks charged
Afterwards, if there is following either condition: maintenance, mother fanout operation, mother CT broken string, bus PT broken string, bus loss of pressure, branch knife
Lock is abnormal, movement etc. of quickly unlinking, then electric discharge of quickly unlinking.
As shown in Fig. 2, after charging complete of quickly unlinking, if the movement of mother zero-sequence current positive direction overcurrent or A, B, C
After any phase positive direction overcurrent movement of phase current, receives outside of quickly unlinking and start switch signal, then delayed quickly by fixed
The movement of Huantiao mother I branch is solved, the double loop branch switch for hanging I mother is cut；If mother zero-sequence current negative direction overcurrent movement or
After any phase negative direction overcurrent movement of person's A, B, C phase current, receives outside of quickly unlinking and start switch signal, then prolong by fixation
Quickly solution Huantiao mother II branch movement afterwards, cuts the double loop branch switch for hanging II mother.
As shown in Fig. 2, zero-sequence direction component positive direction criterion are as follows:
In formula, 3U0For residual voltage, 3I0For zero-sequence current,For zero sequence fineness angle, internal curing of the present invention is 80 °.
Current direction element uses 90 ° of wiring, three-phase directional element positive direction criterion are as follows:
In formula, UrAnd IrFor the voltage and current of three-phase directional element, corresponding relationship under 90 ° of wiring are as follows: Ubc → Ia/Uca
→ Ib/Uab → Ic,For directional element fineness angle (angle of electric current leading voltage), 45 ° are set as in the present invention.
Wherein, the voltage U of three-phase directional elementrSelection use following principle:
1) when long-term memory voltage is effective, UrUsing memory voltage；
2) when long-term memory voltage is invalid, if real-time voltage is greater than 15V, UrUsing real-time voltage；If close
Three-phase fault occurs for exit, and real-time voltage is less than 15V, does not refresh Directional Sign at this time, keeps last more new state, until
Electric discharge or starting return.
Wherein, using memory voltage as reference voltage, the faulty dead zone of institute can be eliminated, outlet three-phase symmetrical is especially overcome
Three-phase voltage is all reduced to zero and loses the deficiency for comparing foundation when short-circuit.
Basis for selecting of the present invention using memory mark as memory voltage: if memory mark is invalid when protection starting,
Then using the voltage of 2 weeks wavefront as memory voltage；If memory mark effectively, uses the electricity of 4 weeks wavefront when protection starting
Pressure is used as memory voltage.When system vibrates, and frequency anomaly or PT break, memory mark is removed.
As shown in Fig. 2, the present invention is internal preferentially to judge zero sequence direction since zero-sequence over-current protection sensitivity is higher
Overcurrent movement, as the operation condition quickly to unlink.When no zero sequence direction acts, A, B are selected, it is any one in C three-phase current
A failure phase judges that the phase positive direction overcurrent acts, as the operation condition quickly to unlink.
Wherein, CT broken string can generate zero-sequence current, therefore, the invention detects that can be latched zero sequence direction mistake when CT breaks
Stream.
Wherein, when electric system is broken down, voltage decline, electric current rises, and therefore, the present invention chooses according to following principle
Failure phase:
1) faulted phase voltage meets low voltage condition, and the present invention is internal to use " less than 0.9 times rated value of phase voltage " conduct
Low voltage criterion；
2) faulted phase current meets high current condition, and the present invention is internal using " phase current is greater than 0.85 times of 3 phase phase current
Maximum value " is used as phase current phase selection criterion；
3) it is not necessarily to consider the integrality of phase selection, need to only confirm and select a failure phase, and guarantee that discriminating direction uses the event
Barrier mutually carries out.
As shown in Fig. 2, the present invention mounts position according to following principle confirmation branch disconnecting link:
1) state according to branch X 1# disconnecting link position, branch X 2# disconnecting link position determines that branch X mounts bus, that is, works as branch
Road X 1# disconnecting link coincidence=1,2# disconnecting link coincidence=0, then it is female to hang I by branch X；Branch X 1# disconnecting link coincidence=0,2# disconnecting link coincidence=
1, then it is female to hang II by branch X；
2) when branch X disconnecting link abnormality alarming, if another branch of same ring is without disconnecting link abnormality alarming, then it is assumed that same ring branch
Hang different buses, i.e., it is normal with another branch disconnecting link of ring when branch X disconnecting link exception, and when extension mother II, then it is female to hang I by branch X.
As shown in Fig. 2, if branch X hangs I mother and quickly the movement of solution Huantiao mother I branch or branch X hang II mother and quickly solution
The movement of Huantiao mother's II branch, then tripping branch X is switched.
The present invention should be able to be compatible with the backstage at current operation station, in time on send movement, warning information；The branch such as definite value, soft pressing plate
Hold remote operation.
The present invention is compatible with the main electrical schemes such as double-bus, single mother partition, can access 6 branch branches of at least three double back wire loop, leads to
It crosses branch disconnecting link position and differentiates branch mounting bus, support branch disconnecting link enforcement functionalities, a certain branch disconnecting link of double back wire loop is different
Chang Shike is modified.
As shown in figure 3, a kind of quickly solution loop device, including system hardware framework, system hardware framework includes CPU board, hands over
Flowing plate, muti-piece open into/output plate, power panel, management bus, data/address bus, power bus.
CPU board can receive user key-press order, also can receive open into/output the signal of plate, and response processing is carried out to it；
Network interface is arranged in CPU board, can direct-connected interchanger progress external communication.
Exchange plate is responsible for the acquisition of of ac, and the data of acquisition are stored to the A/D chip of CPU board.
Open into/output plate, including non-electric quantity open into acquisition, and collected data are passed in the form of built-in message
To CPU board；After the order for receiving CPU board, corresponding relay, execution outlet are driven.It can be according to the specific of substation
Demand configuration muti-piece open into/output plate.
Power panel provides working power by power bus for each plate.Power panel supports supplied by AC/DC electricity, can be by direct current
220V, alternating current 220V convert 5V DC power supply, are the power supply of each plate by power bus.
Data transfer data/address bus, and each plate data are transmitted through data bus transmission.Order transfers management bus, respectively
Plate order is transmitted through management bus transfer.
Front panel provides liquid crystal display and key-press input function.
As shown in figure 4, process flow can be divided into: initialization process, major cycle process and interruption process.Wherein initialize
Process, major cycle process are that sequence executes；Major cycle process can be interrupted by interrupting process.
As shown in figure 4, initialization process is that sequence executes process, only executed after device powers on once, for realizing:
Mode is initial when the initialization of CPU and peripheral hardware, the reading initialization of all kinds of parameters and self-test, logout initialization, school
The functions such as change.
As shown in figure 4, major cycle process is that sequence circulation executes process, major cycle task can be interrupted tasks interrupt, when
After interrupt task is finished, major cycle task is then executed.For realizing: the circulation self-test of definite value, parameter, configuration etc.；Chain
Circular test processing and memory scanning of road transmitting-receiving etc..The management bus communication of each plate is handled in major cycle, and is managed
The transmission order for managing bus message data is then assigned in interrupting service.
As shown in figure 4, interrupting, process includes message reception/processing, definite value area/Parameter analysis of electrochemical area updates and self-test, platform
Public algorithm, relay protective scheme component, logout processing, copy component logo area to global flag area, output element summarize and
Self-test, DBus data and this plate data are incorporated into using area, the LVDS output real-time recording in the area KO, RAM.Relay protective scheme module is being protected
Protecting assembly calls in interrupting.
As shown in figure 5, relay protective scheme component of the invention includes that parameter obtains, and frequency anomaly detection, CT burn out detection, electricity
Sudden Changing Rate starting detection is flowed, memory voltage obtains, again the detection of pressure open condition, disconnecting link position correction, phase current walking direction, and zero
The judgement of sequence current direction, discharging condition detection, the modules such as charge condition detection and relay protective scheme.
As shown in figure 5, the function of parameter acquisition module includes: acquisition real-time voltage, current values and its locking mark, obtain
It takes digital quantity to open into value, obtains to throw and move back type definite value.
As shown in figure 5, the function of frequency anomaly detection module is to judge whether system frequency is stable, when frequency anomaly,
The present invention removes memory mark.
As shown in figure 5, CT burn out detection criterion are as follows:
1) maximum value of A, B, C three-phase current is greater than 0.05 times of rated current In；
2) minimum value of A, B, C three-phase current is less than 0.04 times of rated current In；
3) zero-sequence current is more than 0.1 times of rated current In.
It when above-mentioned 3 conditions meet simultaneously, is delayed by 10s, the present invention can generate CT broken string alarm event, and be latched
Zero sequence direction overcurrent protection.
As shown in figure 5, the formula of jump-value of current starting detection module calculating current Sudden Changing Rate are as follows:
Δ I=I1+I3-2×I2
Wherein, Δ I is jump-value of current, I1For the current value of current sample time, I2For the current value of preceding 1 cycle, I3For
The current value of preceding 2 cycles.
When jump-value of current is greater than 0.15 times of rated current, and continue 5 interrupt after, which can generate mutation
Current start instantaneously indicates that, as the starting foundation of protection act, which broadens 3s.
As shown in figure 5, the function that memory voltage obtains module is to obtain systematic memory voltage, and generate memory mark.
As shown in figure 5, pressing off again, to put condition detection module distinguishing rule as follows:
1) when pressure function control word exits again, judge that is, the bus presses off again puts without multiple pressure；
2) again pressure function control word investment when, following 3 conditions meet its 1, then determine that the bus presses off again and put: bus without
Pressure；Bus negative sequence voltage is greater than negative sequence voltage definite value；Bus residual voltage is greater than residual voltage definite value.
It is the important criterion of protection act logic of quickly unlinking that bus, which presses off put again,.
As shown in figure 5, disconnecting link position correction module can be abnormal according to not occurring disconnecting link with ring when branch X disconnecting link exception
Route disconnecting link position, judge the position of branch X disconnecting link.
As shown in figure 5, phase current walking direction module and zero-sequence current walking direction module obtain zero-sequence current positive direction
Overcurrent movement or any phase positive direction overcurrent movement mark of A, B, C phase current, wherein the movement of zero-sequence current positive direction overcurrent
Priority is higher.
As shown in figure 5, when operating condition meets: bus connection switch paired running (bus connection switch is in coincidence or has stream),
Bus has pressure, is delayed by 10s, and charging detecting model will set charging complete mark.
As shown in figure 5, quickly unlink it is charged after, if there is following either condition: maintenance, mother fanout operation, mother
CT broken string, bus PT broken string, bus loss of pressure, branch disconnecting link is abnormal, and movement etc. of quickly unlinking, discharge examination module will quickly be put
Electricity.
As shown in figure 5, the charging complete that ought quickly unlink, detects positive overcurrent protection, mother is without stream, 1 female multiple press strip part
Meet, it is female that relay protective scheme module will cut off 1；When charging complete of quickly unlinking, detect that reverse overcurrent is protected, mother is without stream, 2 mothers
Multiple press strip part meets, and it is female that relay protective scheme module will cut off 2.
(adjustment protection definite value, adjusts system operation mode, increases protection or automatic device, such as in load with the prior art
The quick disconnection device of side substation installation/in central station configuration breaker fail protection) compare, the present invention is not changing system fortune
, it can be achieved that the substation that double loop is incorporated into the power networks refuses to jump or protect to refuse in line-breaker under the premise of line mode and increase equipment
When dynamic, after main transformer backup protection tripping our station mother, by collecting dependent failure information, bus where faster trip faulty line
Double loop branch switch realization quickly unlink, avoid accident range expansion.
Claims (10)
1. a kind of method of quickly unlinking, which is characterized in that be applied to double loop connection wire power system, comprising the following steps:
S1, quickly solution loop device acquires two sections of busbar voltages and bus connection switch electric current, acquires the bus bar side disconnecting link position of line segregation
Confidence number, starting, which is opened, receives the contact point signal from main transformer protection tripping bus connection switch into contact；
S2, when substation is in double loop loop-net operation state, device charges, after charging complete logic be in investment shape
State；
S3, the quickly starting of solution loop device are opened after contact receives the contact point signal from main transformer protection tripping bus connection switch, are stood
Fault current direction before judging bus connection switch tripping if being directed toward II section of bus by I section of bus, and differentiates by voltage blocking
Afterwards, paired running line switching all on II section of bus of instantaneous tripping；If being directed toward I section of bus, and differentiate by voltage blocking
Afterwards, paired running line switching all on I section of bus is instantaneously jumped；
After S4, bus connection switch tripping, bus where Judging fault element, and paired running completely on the corresponding bus of tripping
Line switching, total used time of this process should be less than the time difference of main transformer tripping bus connection switch and main transformer switch.
2. method according to claim 1 of quickly unlinking, which is characterized in that when operating condition meets: bus connection switch is arranged side by side
Operation, bus have pressure, then quickly unlink by 10s delay charged；Quickly unlink it is charged after, if there is following any bar
Part: maintenance, mother fanout operation, mother CT broken string, bus PT broken string, bus loss of pressure, branch disconnecting link is abnormal, quickly solves gyration
Make, then electric discharge of quickly unlinking.
3. method according to claim 1 of quickly unlinking, it is characterised in that: after charging complete of quickly unlinking, if mother
After the movement of zero-sequence current positive direction overcurrent or any phase positive direction overcurrent movement of A, B, C phase current, outside of quickly unlinking is received
Signal is started switch, then delays quickly solution Huantiao mother I branch movement by fixed, cuts the double loop branch switch for hanging I mother；Such as
After the movement of fruit mother zero-sequence current negative direction overcurrent or any phase negative direction overcurrent movement of A, B, C phase current, quick solution is received
Signal is started switch outside ring, then delays quickly solution Huantiao mother II branch movement by fixed, cut the double loop branch for hanging II mother
Way switch.
4. method according to claim 1 of quickly unlinking, which is characterized in that zero-sequence direction component positive direction criterion are as follows:
In formula, 3U0For residual voltage, 3I0For zero-sequence current,For zero sequence fineness angle, the present invention is cured as 80 °.
5. method according to claim 1 of quickly unlinking, which is characterized in that current direction element uses 90 ° of wiring, three-phase
Directional element positive direction criterion are as follows:
In formula, UrAnd IrFor the voltage and current of three-phase directional element；
Corresponding relationship under 90 ° of wiring are as follows: Ubc → Ia/Uca → Ib/Uab → Ic,For directional element fineness angle, set in the present invention
It is set to 45 °.
6. method according to claim 1 of quickly unlinking, it is characterised in that: process flow is initialization process, major cycle
Process and interruption process, wherein initialization process, major cycle process are that sequence executes, and major cycle stream can be interrupted by interrupting process
Journey.
7. method according to claim 6 of quickly unlinking, it is characterised in that: initialization process is that sequence executes process, only
It is executed after device powers on once, for realizing: the initialization of CPU and peripheral hardware, the reading of all kinds of parameters initializes and oneself
Mode initializes when inspection, logout initialization, school；
Major cycle process is that sequence circulation executes process, and major cycle task can be interrupted tasks interrupt, and when interrupting, task execution is complete
Bi Hou then executes major cycle task；For realizing: definite value, parameter, configuration circulation self-test；The circular test of link transmit-receive
Processing and memory scanning；The management bus communication of each plate is handled in major cycle, and manages the hair of bus message data
Order of losing one's life then is assigned in interrupting service；
Process is interrupted to include message reception/processing, definite value area/Parameter analysis of electrochemical area update and self-test, platform public algorithm, protect and patrol
Volume component, logout processing, copy component logo area to global flag area, output element summarize and self-test, DBus data and
This plate data are incorporated into using area, the LVDS output real-time recording in the area KO, RAM, and relay protective scheme module is adjusted in protection component interrupts
With.
8. method according to claim 7 of quickly unlinking, it is characterised in that: relay protective scheme component includes that parameter obtains, frequently
Rate abnormality detection, CT burn out detection, jump-value of current starting detection, memory voltage obtain, press open condition detection, disconnecting link position again
Set amendment, phase current walking direction, zero-sequence current walking direction, discharging condition detection, charge condition detection and relay protective scheme etc.
Module.
9. a kind of quickly solution loop device, characteristic are: including system hardware framework, system hardware framework includes CPU board, exchange
Plate, muti-piece open into/output plate, power panel, management bus, data/address bus, power bus；
CPU board receives user key-press order, can receive open into/output the signal of plate, and response processing is carried out to it；CPU board is set
Network interface is set, it can direct-connected interchanger progress external communication；
Exchange plate is responsible for the acquisition of of ac, and the data of acquisition are stored to A/D chip；
Open into/output plate, including non-electric quantity open into acquisition, after the order for receiving CPU board, drive corresponding relay,
Execution outlet；
Power panel provides working power by power bus for each plate；
Data are transmitted through data bus transmission, and order is transmitted through management bus transfer.
10. quick solution loop device according to claim 9, it is characterised in that: be equipped with front panel, front panel is equipped with display
Device and data input device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910753167.8A CN110460025B (en) | 2019-08-15 | 2019-08-15 | Quick ring-opening method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN111725777A (en) * | 2020-06-09 | 2020-09-29 | 云南电网有限责任公司临沧供电局 | Ring network automatic ring-opening matching setting method and system based on node loop analysis |
| CN111856213A (en) * | 2020-08-05 | 2020-10-30 | 云南电网有限责任公司红河供电局 | Fault positioning method for looped network operation |
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