CN106329499A - DC grounding protection method for single-rail backflow power supply system - Google Patents
DC grounding protection method for single-rail backflow power supply system Download PDFInfo
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- CN106329499A CN106329499A CN201610886435.XA CN201610886435A CN106329499A CN 106329499 A CN106329499 A CN 106329499A CN 201610886435 A CN201610886435 A CN 201610886435A CN 106329499 A CN106329499 A CN 106329499A
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- Prior art keywords
- feeder cabinet
- transformer station
- interval
- reclosing
- power supply
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
-
- 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
- H02H7/268—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 for dc systems
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a DC grounding protection method for a single-rail backflow power supply system, comprising the steps of dividing the single-rail backflow power supply system into four independent power supply areas according to upper, lower, left and right relationship, providing a controller for receiving the DC grounding protection trip signal and control trip or overlapping trip; tripping four power supply areas when the controller receives the DC grounding protection trip signal; meanwhile reclosing each power supply area successively, judging whether the power supply area has fault or not according to the DC grounding protection strip signal received by the reclosing; if some power supply area has fault, the feeder in the fault power supply area strips and is locked. The method in the invention can confirm and cut the fault area quickly, automatically recover the normal power supply in the fault area, improve the reliability and stability of the power supply system and avoid the equipment damage caused by repeat reclosing of DC circuit breaker.
Description
Technical field
The present invention relates to the DC earthing resist technology of single track return-flow system, specifically disclose a kind of for single track backflow confession
The DC earthing guard method of electricity system.
Background technology
In urban rail DC power-supply system, for relative rail backflow electric power system, single track backflow electric power system can
Reducing stray electrical current harm, avoid interference based on track signaling system, therefore single track backflow electric power system cannot be only used for
Traditional metal wheel train is it can also be used to the train of rubber wheel, even magnetic-levitation train.Such as, current Chongqing 2 line sit-astride
In monorail train, Changsha, low speed magnetic suspension train and Beijing magnetic-levitation train in building all uses single track backflow electric power system to supply
Electricity.In single track backflow electric power system, for detection direct-flow positive pole earth fault, it is configured with DC earthing protection device, is called for short 64D
Cabinet.When there is DC ground fault, this device sends trip signal, makes our station and the tripping operation of neighboring station feeder cabinet locking.Therefore
Easily cause large-area power-cuts, even withdrawal of train, the stable and safety of serious threat electric power system.
In order to detect direct-flow positive pole earth fault, each transformer substation system one DC earthing protection device of configuration, and pacify
It is contained between negative electrode bus and the earth, by detection voltage therebetween, it is determined whether break down.When direct-flow positive pole is with big
Ground short circuit (direct-flow positive pole of magnetic-levitation train and F rail short circuit), between the earth and negative electrode bus, voltage raises, and triggers DC earthing and protects
Protection unit sends protection signal.Currently for this fault-signal, a kind of scheme is to make our station straight with what neighboring station was powered to this interval
Stream feeder cabinet all trips locking, by stopping power supply, excises fault section；Another kind of scheme be gradually start our station up,
Descending reclosing, judges according to the most again receiving fault-signal after uplink and downlink reclosing and excises fault section.Because it is whole
The earth electrical connection of individual electric power system, negative electrode bus is through, and when certain point generation direct-flow positive pole earth fault, the earth is with negative
Potential difference between pole increases, and the DC earthing protection device in the very wide range of trouble point can detect this current potential
Difference, and the protection act that is triggered, make continuous multiple transformer stations tripping operation of correspondence.If the DC earthing in adjacent three transformer stations
Protection device action, then these three transformer station is protection output, is again that protection receives.Both the above scheme is all with individually
Transformer station, for analyzing object, have ignored influencing each other between adjacent substations, DC ground fault once occurs, will be because of phase
Interlocking between adjacent transformer station causes the tripping operation of multiple transformer station to have a power failure, and the stability of the power supply of city railway system having a strong impact on is with reliable
Property.
As it is shown in figure 1, in typical case's traction substation train traction electric power system, RT1, RT2 are rectifier transformer；R1、R2
For commutator；201,202 is incoming line cabinet；211 being the first descending feeder cabinet, 213 be the second descending feeder cabinet, 212 is on first
Row feeder cabinet, 214 it is the second up feeder cabinet；2011,2021,2211,2212,2213,2214 is negative pole isolation knife；2111、
2131,2121,2141 is online isolation knife；2113,2124 is more district's isolation knife；64D is DC earthing protection device.City at present
Feeder cabinet in rail DC power-supply system is provided with reclosing function, when feeder cabinet is because of fault trip, can start reclosing, make to set
For again closing a floodgate.The DC earthing protection device (64D cabinet) of typical single track backflow electric power system is arranged on negative electrode bus with big
Between ground, when certain direct-flow positive pole and the earth short circuit, between the earth and negative pole, produce potential difference, trigger DC earthing protection
Device action.Due to the earth electrical connection of whole electric power system, each transformer station is up, the electrical connection of downgoing line negative electrode bus,
There is DC ground fault in the most any circuit, and the DC earthing protection device in the very wide range of trouble point can
This voltage difference being detected and the protection act that is triggered, causing trouble interval is difficult to determine.
Summary of the invention
The technical problem to be solved in the present invention is: for the problems referred to above of prior art, it is provided that one can not only be quick
Determine and excise fault section, additionally it is possible to automatically recovering the normal power supply that other fault-free are interval, improving electric power system reliability
And stability, it is to avoid dc circuit breaker reclosing repeatedly causes the DC earthing for single track backflow electric power system of equipment damage
Guard method.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is:
A kind of DC earthing guard method for single track backflow electric power system, step includes:
1) power supply of each transformer station of electric power system of single track being refluxed interval according to up and down line and with adjacent substations
Left and right syntopy is divided into independent four power supply interval, and described four power supply intervals include under left adjacent downlink interval, right neighbour
Row adjacent uplink interval interval, left and right adjacent uplink interval；It is equipped with one and connects for receiving the direct current of DC earthing protection device 64D
The feeder cabinet in ground trip protection signal and control power supply interval trips or the controller of reclosing；When described controller receives directly
During stream ground protection trip signal, redirect execution step 2)；
2) described controller sends whole trip signal and makes the interval all tripping operations of described four power supplies, and the most described controller is successively
Carry out reclosing for each power supply interval, and receive DC earthing protection device 64D according to whether remaining after reclosing
DC earthing trip protection signal judge whether this power supply interval breaks down, if breaking down in a certain power supply interval,
The feeder cabinet tripping operation then fault being powered interval locking.
Preferably, described single track backflow electric power system includes that multiple transformer station, described transformer station all include the first descending feedback
Line cabinet 211, first up feeder cabinet the 212, second descending feeder cabinet 213 and the second up feeder cabinet 214, described left neighbour is descending
Interval feeder cabinet includes the second descending feeder cabinet 213 of the first descending feeder cabinet 211 and Zuo Lin transformer station of target substation,
The feeder cabinet of described right adjacent downlink interval includes first time of the second descending feeder cabinet 213 and You Lin transformer station of target substation
Row feeder cabinet 211, the feeder cabinet of described left adjacent uplink interval includes the first up feeder cabinet 212 of target substation and left adjacent change
The second up feeder cabinet 214 in power station, the feeder cabinet of described right adjacent uplink interval includes the second up feeder line of target substation
First up feeder cabinet 212 of cabinet 214 and You Lin transformer station.
Preferably, step 2) detailed step include:
2.1) by target substation corresponding for DC earthing trip protection signal and the tripping operation of adjacent substations thereof；
2.2) described controller sends lower left line reclosing signal, starts the first descending feeder cabinet 211 of target substation with left
Second descending feeder cabinet 213 reclosing of adjacent transformer station；
2.3) at the first descending feeder cabinet 211 and the second descending feeder cabinet 213 reclosing of Zuo Lin transformer station of target substation
After, if controller does not receives the DC earthing trip protection signal of target substation in specifying duration, then judge under left neighbour
The interval fault-free of row, and continue to redirect execution step 2.4)；Otherwise judging that left adjacent downlink interval is faulty, controller sends lower-left
Row trip signal, by the first of target substation the descending feeder cabinet 211 with the second of Zuo Lin transformer station descending feeder cabinet 213 jump
Lock, redirects execution step 2.4)；
2.4) described controller sends lower right line reclosing signal, starts the second descending feeder cabinet 213 of target substation with right
First descending feeder cabinet 211 reclosing of adjacent transformer station；
2.5) at the second descending feeder cabinet 213 and the first descending feeder cabinet 211 reclosing of You Lin transformer station of target substation
After, if controller does not receives the DC earthing trip protection signal of target substation in specifying duration, then judge under right neighbour
The interval fault-free of row, and continue to redirect execution step 2.6)；Otherwise judging that right adjacent downlink interval is faulty, controller sends bottom right
Row trip signal, trips the second of target substation the descending feeder cabinet 213, redirects execution step 2.6)；
2.6) described controller sends upper left line reclosing signal, starts first up feeder cabinet 212 and a left side of target substation
Second up feeder cabinet 214 reclosing of adjacent transformer station；
2.7) at second up feeder cabinet 214 reclosing of the first up feeder cabinet 212 and Zuo Lin transformer station of target substation
After, if controller does not receives the DC earthing trip protection signal of target substation in specifying duration, then judge on left neighbour
The interval fault-free of row, and continue to redirect execution step 2.8)；Otherwise judging that left adjacent uplink interval is faulty, controller sends upper left
Row trip signal, jumps the second up feeder cabinet 214 of the first of target substation the up feeder cabinet 212 and Zuo Lin transformer station
Lock, redirects execution step 2.8)；
2.8) described controller sends upper right line reclosing signal, starts second up feeder cabinet 214 and the right side of target substation
First up feeder cabinet 212 reclosing of adjacent transformer station；
2.7) at first up feeder cabinet 212 reclosing of the second up feeder cabinet 214 and You Lin transformer station of target substation
After, if controller does not receives the DC earthing trip protection signal of target substation in specifying duration, then judge on right neighbour
The interval fault-free of row, redirects execution step 2.10)；Otherwise judging that right adjacent uplink interval is faulty, controller sends upper right line and jumps
Lock signal, trips the first up feeder cabinet 212 of the second of target substation the up feeder cabinet 214 and You Lin transformer station, jumps
Turn and perform step 2.10)；
2.10) terminate and exit.
Preferably, a length of the 1～200s of described appointment duration.
For the DC earthing guard method of single track backflow electric power system, the present invention has an advantage that the present invention is by single track
The power supply of backflow each transformer station of electric power system interval according to up and down line and with the left and right syntopy of adjacent substations
It is divided into independent four power supply interval, is equipped with one and jumps for receiving the DC earthing protection of DC earthing protection device 64D
The feeder cabinet in lock signal and control power supply interval trips or the controller of reclosing；Jump when controller receives DC earthing protection
During lock signal, controller sends whole trip signal and makes four interval all tripping operations of power supply, and controller is successively for each simultaneously
Individual power supply interval carries out reclosing, and according to whether remaining the direct current receiving DC earthing protection device 64D after reclosing connects
Ground trip protection signal judges whether this power supply interval breaks down, if breaking down, then by fault in a certain power supply interval
The feeder cabinet tripping operation also locking that power supply is interval, can not only quickly determine and excise fault section, additionally it is possible to automatically recover other
The normal power supply that fault-free is interval, improves electric power system reliability and stability, it is to avoid dc circuit breaker reclosing repeatedly causes
Equipment damage.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram of prior art typical single track backflow electric power system.
Fig. 2 is the basic procedure schematic diagram of embodiment of the present invention method.
Fig. 3 is the circuit theory schematic diagram of continuous three station single track backflow electric power systems in the embodiment of the present invention.
Fig. 4 is the input/output signal port schematic diagram of embodiment of the present invention middle controller.
Fig. 5 is step 2 of the present invention) detailed process schematic diagram.
Detailed description of the invention
For single track backflow electric power system, although whole DC power-supply system relatedness is strong, but each service area
Between be completely independent.Hereafter by as a example by continuous three transformer stations (transformer station A～transformer station C), transformer station A～transformer station C all includes
First descending feeder cabinet 211, first up feeder cabinet the 212, second descending feeder cabinet 213 and the second up feeder cabinet 214, right
The present invention is described in further detail for the DC earthing guard method of single track backflow electric power system.
As in figure 2 it is shown, the present invention includes for the step of the DC earthing guard method of single track backflow electric power system:
1) power supply of each transformer station of electric power system of single track being refluxed interval according to up and down line and with adjacent substations
Left and right syntopy is divided into independent four power supply interval, and four power supply intervals include left adjacent downlink interval, right adjacent descender
Between, left adjacent uplink interval and right adjacent uplink interval；It is equipped with one and protects for receiving the DC earthing of DC earthing protection device 64D
Protect trip signal and control the interval feeder cabinet tripping operation of power supply or the controller of reclosing；Protect when controller receives DC earthing
When protecting trip signal, redirect execution step 2)；
2) controller sends whole trip signal and makes four interval all tripping operations of power supply, and controller supplies for each successively simultaneously
Electricity interval carries out reclosing, and according to whether remaining the DC earthing receiving DC earthing protection device 64D after reclosing protects
Protecting trip signal to judge whether this power supply interval breaks down, if breaking down in a certain power supply interval, then fault being powered
Interval feeder cabinet tripping operation locking.
Shown in Fig. 3, in the present embodiment, single track backflow electric power system includes 3 transformer stations (transformer station A～transformer station C),
Transformer station all includes that first descending feeder cabinet 211, first up feeder cabinet the 212, second descending feeder cabinet 213 and second is up
Feeder cabinet 214, the feeder cabinet of left adjacent downlink interval includes the first descending feeder cabinet 211 and Zuo Lin transformer station of target substation
The second descending feeder cabinet 213 of (transformer station A), the feeder cabinet of right adjacent downlink interval includes the second descending feeder line of target substation
First descending feeder cabinet 211 of cabinet 213 and You Lin transformer station (transformer station C), the feeder cabinet of left adjacent uplink interval includes that target becomes
Second up feeder cabinet 214 of first up the feeder cabinet 212 and Zuo Lin transformer station (transformer station A) in power station, right adjacent uplink interval
Feeder cabinet include the first up feeder line of the second up feeder cabinet 214 and You Lin transformer station (transformer station C) of target substation
Cabinet 212.Using transformer station B as target substation, then understand four power supplies interval specific as follows: left adjacent downlink interval: transformer station B
The first descending feeder cabinet 211 and the second descending feeder cabinet 213 of transformer station A), right adjacent downlink interval (second time of transformer station B
Row feeder cabinet 213 and the first descending feeder cabinet 211 of transformer station C), left adjacent uplink interval (the first up feeder cabinet of transformer station B
212 with the second up feeder cabinet 214 of transformer station A), right adjacent uplink interval (the second up feeder cabinet 214 of transformer station B with become
The first up feeder cabinet 212 of power station C).After DC earthing trip protection, in a protection period T, by gradually starting confession
The method of the interval reclosing of electricity, it is determined that trouble point.
Shown in Fig. 4, the present embodiment is equipped with a controller, is used for accepting, processing DC earthing protection signal, and root
According to result, the feeder cabinet making corresponding power supply interval trips or reclosing.Wherein, input port I0.0 is used for receiving direct current and connects
The DC earthing trip protection signal of ground protection device 64D.Output port Q0.0 is used for exporting whole trip signal, output port
Q0.0 exports after whole trip signals, then controller is by target substation corresponding for DC earthing trip protection signal and adjacent
The tripping operation of transformer station.Output port Q0.1 is used for exporting lower left line trip signal, by the first of target substation the descending feeder cabinet
211 trip with the second descending feeder cabinet 213 of Zuo Lin transformer station (transformer station A)；Output port Q0.2 is used for lower left line reclosing
Signal, starts the first descending feeder cabinet 211 of target substation and the second descending feeder cabinet of Zuo Lin transformer station (transformer station A)
213 reclosings.Output port Q0.3 is used for exporting lower right line trip signal, by the second of target substation the descending feeder cabinet 213
Tripping operation；Output port Q0.4 is used for lower right line reclosing signal, starts the second descending feeder cabinet 213 of target substation and right neighbour
First descending feeder cabinet 211 reclosing of transformer station (transformer station C).Output port Q0.5 is used for exporting upper left line trip signal,
Second up feeder cabinet 214 of the first of target substation the up feeder cabinet 212 and Zuo Lin transformer station (transformer station A) is tripped；
Output port Q0.6 is used for upper left line reclosing signal, starts the first up feeder cabinet 212 of target substation and left adjacent power transformation
Stand second up feeder cabinet 214 reclosing of (transformer station A).Output port Q0.7 is used for exporting upper right line trip signal, by mesh
First up feeder cabinet 212 of the second up feeder cabinet 214 and You Lin transformer station (transformer station C) of mark transformer station trips；Output
Port Q1.0 is used for upper right line reclosing signal, and the second up the feeder cabinet 214 and You Lin transformer station starting target substation (becomes
Power station C) the first up feeder cabinet 212 trip reclosing.
As it is shown in figure 5, when the input port I0.0 of controller receives DC earthing trip protection signal, redirect and perform step
Rapid 2).In the present embodiment, step 2) detailed step include:
2.1) the output port Q0.0 of controller exports whole trip signals, by target corresponding for DC earthing trip protection signal
Transformer station (transformer station B) and the tripping operation of adjacent substations (transformer station A and C) thereof；
2.2) the output port Q0.2 of controller sends lower left line reclosing signal, starts the of target substation (transformer station B)
Simply being expressed as target substation 211 in one descending feeder cabinet 211(figure, simple expression rule is identical below) and Zuo Lin transformer station
Simply being expressed as left neighboring station 213 in the second descending feeder cabinet 213(figure of (transformer station A), simple expression rule is identical below) weight
Close a floodgate；
2.3) in second time of the first descending feeder cabinet 211 and Zuo Lin transformer station (transformer station A) of target substation (transformer station B)
After row feeder cabinet 213 reclosing, if the input port I0.0 of controller does not receives target substation (power transformation in specifying duration
Stand B) DC earthing trip protection signal, then judge left adjacent downlink interval fault-free, and continue to redirect execution step 2.4)；No
Then judging that left adjacent downlink interval is faulty, the output port Q0.1 of controller sends lower left line trip signal, by target substation
The first descending feeder cabinet 211 of (transformer station B) trips with the second descending feeder cabinet 213 of Zuo Lin transformer station (transformer station A), redirects
Perform step 2.4)；
2.4) the output port Q0.4 of controller sends lower right line reclosing signal, starts the of target substation (transformer station B)
Two descending feeder cabinets 213 and the first descending feeder cabinet 211 reclosings of You Lin transformer station (transformer station C)；
2.5) in first time of the second descending feeder cabinet 213 and You Lin transformer station (transformer station C) of target substation (transformer station B)
After row feeder cabinet 211 reclosing, if the input port I0.0 of controller does not receives target substation (power transformation in specifying duration
Stand B) DC earthing trip protection signal, then judge right adjacent downlink interval fault-free, and continue to redirect execution step 2.6)；No
Then judging that right adjacent downlink interval is faulty, the output port Q0.3 of controller sends lower right line trip signal, by target substation
The second descending feeder cabinet 213 of (transformer station B) trips, and redirects execution step 2.6)；
2.6) the output port Q0.6 of controller sends upper left line reclosing signal, starts the of target substation (transformer station B)
Second up feeder cabinet 214 reclosing of one up feeder cabinet 212 and Zuo Lin transformer station (transformer station A)；
2.7) on the second of the first up feeder cabinet 212 and Zuo Lin transformer station (transformer station A) of target substation (transformer station B)
After row feeder cabinet 214 reclosing, if the input port I0.0 of controller does not receives target substation (power transformation in specifying duration
Stand B) DC earthing trip protection signal, then judge left adjacent uplink interval fault-free, and continue to redirect execution step 2.8)；No
Then judging that left adjacent uplink interval is faulty, the output port Q0.5 of controller sends upper left line trip signal, by target substation
Second up feeder cabinet 214 of first up the feeder cabinet 212 and Zuo Lin transformer station (transformer station A) of (transformer station B) trips, and redirects
Perform step 2.8)；
2.8) the output port Q1.0 of controller sends upper right line reclosing signal, starts the of target substation (transformer station B)
First up feeder cabinet 212 reclosing of two up feeder cabinet 214 and You Lin transformer stations (transformer station C)；
2.7) on the first of the second up feeder cabinet 214 and You Lin transformer station (transformer station C) of target substation (transformer station B)
After row feeder cabinet 212 reclosing, if the input port I0.0 of controller does not receives target substation (power transformation in specifying duration
Stand B) DC earthing trip protection signal, then judge right adjacent uplink interval fault-free, redirect execution step 2.10)；Otherwise sentence
Fixed right adjacent uplink interval is faulty, and the output port Q0.7 of controller sends upper right line trip signal, by target substation (power transformation
Stand B) the first up feeder cabinet 212 of the second up feeder cabinet 214 and You Lin transformer station (transformer station C) trip, redirect execution
Step 2.10)；
2.10) terminate and exit.
In the present embodiment, can be adjusted it between a length of 1～200s of aforesaid appointment duration as required and actual take
It is worth, and the step-length adjusted is 1s, the concrete a length of 5s of aforesaid appointment duration in the present embodiment.
Above-mentioned steps 2.1)～2.10) in carry out tripping operation and during reclosing, it is necessary to keep same power supply interval to carry out simultaneously
Two feeder cabinets of tripping operation/reclosing carry out the synchronicity of tripping operation and reclosing.For each power supply interval, if closed
No longer receive trip signal after lock, then judge this interval fault-free.If again receiving trip signal after He Zhaing, then judge
Break down in this interval, the corresponding feeder cabinet of tripping operation locking.It should be noted that above-mentioned steps 2.1)～2.10) be only with
The instantiation that the definition of output port shown in Fig. 4 is carried out, in implementation process, controller can also be according to other output ports
Definition carry out output signal control the tripping operation of each feeder cabinet and reclosing, do not repeat them here.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned enforcement
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that, for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications are also
Should be regarded as protection scope of the present invention.
Claims (4)
1. the DC earthing guard method for single track backflow electric power system, it is characterised in that step includes:
1) power supply of each transformer station of electric power system of single track being refluxed interval according to up and down line and with adjacent substations
Left and right syntopy is divided into independent four power supply interval, and described four power supply intervals include under left adjacent downlink interval, right neighbour
Row adjacent uplink interval interval, left and right adjacent uplink interval；It is equipped with one and connects for receiving the direct current of DC earthing protection device 64D
The feeder cabinet in ground trip protection signal and control power supply interval trips or the controller of reclosing；When described controller receives directly
During stream ground protection trip signal, redirect execution step 2)；
2) described controller sends whole trip signal and makes the interval all tripping operations of described four power supplies, and the most described controller is successively
Carry out reclosing for each power supply interval, and receive DC earthing protection device 64D according to whether remaining after reclosing
DC earthing trip protection signal judge whether this power supply interval breaks down, if breaking down in a certain power supply interval,
The feeder cabinet tripping operation then fault being powered interval locking.
DC earthing guard method for single track backflow electric power system the most according to claim 1, it is characterised in that institute
State single track backflow electric power system and include that multiple transformer station, described transformer station all include first descending feeder cabinet the 211, first up feedback
Line cabinet the 212, second descending feeder cabinet 213 and the second up feeder cabinet 214, the feeder cabinet of described left adjacent downlink interval includes mesh
Second descending feeder cabinet 213 of the first descending feeder cabinet 211 and Zuo Lin transformer station of mark transformer station, described right adjacent downlink interval
Feeder cabinet includes the first descending feeder cabinet 211 of the second descending feeder cabinet 213 and You Lin transformer station of target substation, a described left side
The feeder cabinet of adjacent uplink interval includes the second up feeder line of the first up feeder cabinet 212 and Zuo Lin transformer station of target substation
Cabinet 214, the feeder cabinet of described right adjacent uplink interval includes the second up feeder cabinet 214 and You Lin transformer station of target substation
First up feeder cabinet 212.
DC earthing guard method for single track backflow electric power system the most according to claim 2, it is characterised in that step
Rapid 2) detailed step includes:
2.1) by target substation corresponding for DC earthing trip protection signal and the tripping operation of adjacent substations thereof；
2.2) described controller sends lower left line reclosing signal, starts the first descending feeder cabinet 211 of target substation with left
Second descending feeder cabinet 213 reclosing of adjacent transformer station；
2.3) at the first descending feeder cabinet 211 and the second descending feeder cabinet 213 reclosing of Zuo Lin transformer station of target substation
After, if controller does not receives the DC earthing trip protection signal of target substation in specifying duration, then judge under left neighbour
The interval fault-free of row, and continue to redirect execution step 2.4)；Otherwise judging that left adjacent downlink interval is faulty, controller sends lower-left
Row trip signal, by the first of target substation the descending feeder cabinet 211 with the second of Zuo Lin transformer station descending feeder cabinet 213 jump
Lock, redirects execution step 2.4)；
2.4) described controller sends lower right line reclosing signal, starts the second descending feeder cabinet 213 of target substation with right
First descending feeder cabinet 211 reclosing of adjacent transformer station；
2.5) at the second descending feeder cabinet 213 and the first descending feeder cabinet 211 reclosing of You Lin transformer station of target substation
After, if controller does not receives the DC earthing trip protection signal of target substation in specifying duration, then judge under right neighbour
The interval fault-free of row, and continue to redirect execution step 2.6)；Otherwise judging that right adjacent downlink interval is faulty, controller sends bottom right
Row trip signal, trips the second of target substation the descending feeder cabinet 213, redirects execution step 2.6)；
2.6) described controller sends upper left line reclosing signal, starts first up feeder cabinet 212 and a left side of target substation
Second up feeder cabinet 214 reclosing of adjacent transformer station；
2.7) at second up feeder cabinet 214 reclosing of the first up feeder cabinet 212 and Zuo Lin transformer station of target substation
After, if controller does not receives the DC earthing trip protection signal of target substation in specifying duration, then judge on left neighbour
The interval fault-free of row, and continue to redirect execution step 2.8)；Otherwise judging that left adjacent uplink interval is faulty, controller sends upper left
Row trip signal, jumps the second up feeder cabinet 214 of the first of target substation the up feeder cabinet 212 and Zuo Lin transformer station
Lock, redirects execution step 2.8)；
2.8) described controller sends upper right line reclosing signal, starts second up feeder cabinet 214 and the right side of target substation
First up feeder cabinet 212 reclosing of adjacent transformer station；
2.7) at first up feeder cabinet 212 reclosing of the second up feeder cabinet 214 and You Lin transformer station of target substation
After, if controller does not receives the DC earthing trip protection signal of target substation in specifying duration, then judge on right neighbour
The interval fault-free of row, redirects execution step 2.10)；Otherwise judging that right adjacent uplink interval is faulty, controller sends upper right line and jumps
Lock signal, trips the first up feeder cabinet 212 of the second of target substation the up feeder cabinet 214 and You Lin transformer station, jumps
Turn and perform step 2.10)；
2.10) terminate and exit.
DC earthing guard method for single track backflow electric power system the most according to claim 3, it is characterised in that institute
State and specify a length of the 1～200s of duration.
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