CN104037934A - Spare power automatic switching emergency device and method for power system of transformer substation - Google Patents
Spare power automatic switching emergency device and method for power system of transformer substation Download PDFInfo
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- CN104037934A CN104037934A CN201410270736.0A CN201410270736A CN104037934A CN 104037934 A CN104037934 A CN 104037934A CN 201410270736 A CN201410270736 A CN 201410270736A CN 104037934 A CN104037934 A CN 104037934A
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Abstract
The invention provides a spare power automatic switching emergency device for a power system of a transformer substation. The spare power automatic switching emergency device comprises a sampling unit, a protection unit, a switching transistor and a logical control unit, wherein an own side switch in the sampling unit is connected with an own side power supply incoming line and a bus, a bus coupler switch is connected with own and opposite side buses, a voltage sampling module is connected with own and opposite side power supply incoming lines, and a current sampling module is connected with an own side bus; the protection unit is connected with the sampling unit, and is used for determining a working mode and transmitting a level signal to the switching transistor according to the current value of the own side bus; the switching transitor is connected with the three units respectively, and is switched on or off according to the magnitude of the level signal; the logical control unit is used for determining to start up the own side power supply incoming line or the opposite side bus to supply power to the own side bus according to the three-phase voltage values of the own and opposite side power supply incoming lines when the switching transistor is switched on. The spare power automatic switching emergency device is simple in structure and is convenient to detach, the risk of long-time voltage loss of the own side bus is avoided, and a large quantity of financial resources and time are saved.
Description
Technical field
The present invention relates to power system transformer substation station power use system technical field, relate in particular to the emergent apparatus and method of a kind of Substation Station using electricity system prepared auto restart.
Background technology
As shown in Figure 1, Substation Station using electricity system provides reliable and stable 380V AC power for AC load in transformer station, its common configuration is I section bus a' and II section bus b' fanout operation, I section bus a' and II section bus b' AC power are drawn respectively from two low-pressure sides of station for subsequent use transformer each other, to be I section bus a' use uprise switch S T1 and other potential device transformation of transformer by 10KV AC power by station is that the #1 of the #1 station power supply P1 inlet wire of standing is powered, it is that the #2 of the #2 station power supply P2 inlet wire of standing is powered that II section bus b' uses uprise switch S T2 and other potential device transformation of transformer by 10KV AC power by station.In the time that I section bus a' loses the power supply P1 inlet wire power supply of #1 station, be that the service entrance switch 1QF inefficacy of #1 station disconnects, the backup auto-activating device N1 being exchanged in inlet wire screen M1 by the bus being arranged in #1 station passes through closed bus connection switch 3QF, the II section bus b' that switches to the power supply P2 inlet wire power supply of #2 station is upper, avoids I section bus a' decompression; In the time that II section bus b' loses the power supply P2 inlet wire power supply of #2 station, be that the service entrance switch 2QF inefficacy of #2 station disconnects, the backup auto-activating device N2 being exchanged in inlet wire screen M2 by the bus being arranged in #2 station passes through closed bus connection switch 3QF, the I section bus a' that switches to the power supply P1 inlet wire power supply of #1 station, avoids II section bus b' decompression.
At present, Substation Station using electricity system backup auto-activating device uses widely in each transformer station of electric power system, manufacturer that this device relates to too much and product type too complicated, its shortcoming is: 1, because manufacturer is too much, once therefore device breaks down, need return to different manufacturers and change, waste a large amount of time, especially the device of part model stops production, waits for the overlong time of upgrading, causes the risk of station power use system bus loss of pressure to increase; 2, product type is too complicated, is unfavorable for safeguarding, for guaranteeing that plant failure can quick solution, needs lay in a large number the reserve arrangements of each product type, thereby wastes a large amount of financial resources simultaneously.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, provide a kind of Substation Station using electricity system prepared auto restart emergent apparatus and method, can be used for substituting when urgent traditional backup auto-activating device, it is simple in structure, be convenient to safeguard, avoid the risk of the long-time decompression of bus in this side station, thereby a large amount of financial resources and time are saved, for safety and the stability operation of station power use system provide guarantee.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of Substation Station using electricity system prepared auto restart emergent device, comprises sampling unit, protected location, switching transistor and logic control element; Wherein,
One end of described sampling unit is connected with one end of described protected location, and the other end is connected with the source electrode of described switching transistor, and it comprises this side switch, bus connection switch, voltage sample module and current sample module; Wherein, the two ends of described side switch respectively with this side for station in electric power incoming line, this side station bus be connected; One end of described bus connection switch is connected with bus in offside station, and the other end is connected with bus in described side station; The two ends of described voltage sample module are connected with electric power incoming line in electric power incoming line, offside station for station with described side respectively, the three-phase voltage value for this side station described in Real-time Collection with electric power incoming line and offside station electric power incoming line; Described current sample module is connected with bus in described side station, for the three-phase electricity flow valuve of bus in this side station described in Real-time Collection;
The other end of described protected location is connected with the grid of described switching transistor, be used for the size of the three-phase electricity flow valuve of bus in described the side station of arriving according to described Real-time Collection, determine work at present pattern, and send corresponding level signal according to described definite work at present pattern to described switching transistor; Wherein, described work at present pattern comprises protected mode and normal mode, and level signal corresponding to described protected mode is low level signal, and the level signal that described normal mode is corresponding is high level signal;
The drain electrode of described switching transistor is connected with described logic control element, for according to the height of the level signal of described protected location transmission, realizes conducting or disconnection between described sampling unit and described logic control element;
Described logic control element, while being used for described sampling unit conducting, the size of the three-phase voltage value of electric power incoming line and offside station electric power incoming line for described side station arriving according to described Real-time Collection, determines and enables in described side station electric power incoming line or described offside station bus to bussed supply in described side station.
Wherein, described logic control element comprises the first voltage relay, second voltage relay, auxiliary relay and direct voltage source; Wherein, described the first voltage relay, second voltage relay and auxiliary relay three are in series into a circuit, and described in the circuit and the described direct voltage source that are in series be in parallel;
Described the first voltage relay, when with described sampling unit conducting, the size of the three-phase voltage value of described the side station electric power incoming line arriving according to described Real-time Collection, determines in disconnecting or closure state;
Described second voltage relay, when with described sampling unit conducting, the size of the three-phase voltage value of electric power incoming line for the described offside station of arriving according to described Real-time Collection, determines in disconnecting or closure state;
Described auxiliary relay, while being used for described sampling unit conducting, according to the open and-shut mode of described the first definite voltage relay and second voltage relay, determine in disconnecting or closure state, and when with described sampling unit conducting, realize the control of open and-shut mode to described side switch and bus connection switch, thereby determine and enable in described side station electric power incoming line or described offside station bus to bussed supply in described side station.
Wherein, when with described sampling unit conducting, and described Real-time Collection to described side station while being less than by least one phase voltage value in the three-phase voltage value of electric power incoming line in the three-phase voltage value of default voltage threshold and described offside station electric power incoming line that each phase voltage value is all greater than described default voltage threshold, described the first voltage relay and described voltage the second relay are all closed, make described auxiliary relay closure, thereby described in the circuit that is in series form a connection circuit, when with described sampling unit conducting, described in described auxiliary relay control, this side switch disconnects and controls described bus connection switch closure, determine and enable bus to bussed supply in described side station at described offside the station in.
Wherein, when with described sampling unit conducting, and described Real-time Collection to described side station when in electric power incoming line three-phase voltage value, each phase voltage value is all greater than default voltage threshold, described the first voltage relay disconnects, described auxiliary relay is disconnected, thereby described in the circuit that is in series be off-state, when with described sampling unit conducting, described in described auxiliary relay control, this side switch is closed and control described bus connection switch and disconnect, and determines and enables described side station electric power incoming line to bussed supply in described side station.
Wherein, described protected mode comprises overcurrent protection pattern and zero-sequenceprotection pattern; Wherein,
When described Real-time Collection to this side station in when arbitrary current value is greater than the first default current threshold in the three-phase electricity flow valuve of bus, described protected location enters overcurrent protection pattern, controlling described side switch disconnects, and send low level signal to described switching transistor, described switching transistor is disconnected, realize between described sampling unit and described logic control element and disconnecting;
When described Real-time Collection to this side station in 1/3rd while being greater than the second default current threshold of three-phase electricity flow valuve summation in the three-phase electricity flow valuve of bus; described protected location enters zero-sequenceprotection pattern; controlling described side switch disconnects; and send low level signal to described switching transistor; described switching transistor is disconnected, realize between described sampling unit and described logic control element and disconnecting.
Wherein, described current sample module comprises three current transformers, and described three current transformers are the current transformer based on Luo-coil, respectively with described side station in the threephase cable of bus be socketed one by one.
Wherein, described voltage sample module comprises six voltage fuses, and wherein, three voltage fuses are connected with the three-phase inlet wire of power supply one by one with described side station respectively, and another three voltage fuses are connected with the three-phase inlet wire of power supply one by one with described offside station respectively.
The embodiment of the present invention also provides a kind of Substation Station using electricity system prepared auto restart emergent method, and it realizes in the emergent device of aforesaid Substation Station using electricity system prepared auto restart, and described method comprises:
The three-phase electricity flow valuve of bus in the three-phase voltage value of this side of Real-time Collection station use electric power incoming line, the three-phase voltage value that electric power incoming line is used at offside station and this side station;
In described the side station of arriving according to described Real-time Collection, the size of the three-phase electricity flow valuve of bus, determines work at present pattern, and sends corresponding level signal according to described definite work at present pattern; Wherein, described work at present pattern comprises protected mode and normal mode, and level signal corresponding to described protected mode is low level signal, and the level signal that described normal mode is corresponding is high level signal;
Receive the level signal of described transmission, and according to the height of the described level signal receiving, judge to the switch instances between the circuit of bussed supply in described side station;
In the time can realizing switching between the circuit of giving bussed supply in described side station, the size of the three-phase voltage value of electric power incoming line and offside station electric power incoming line for described side station arriving according to described Real-time Collection, determines and enables in described side station electric power incoming line or described offside station bus to bussed supply in described side station.
Wherein, in described described the side station of arriving according to described Real-time Collection, the size of the three-phase electricity flow valuve of bus, determines work at present pattern, and the concrete steps that send corresponding level signal according to described definite work at present pattern comprise:
When described Real-time Collection to this side station in when arbitrary current value is greater than the first default current threshold in the three-phase electricity flow valuve of bus, determine that work at present pattern is the overcurrent protection pattern in protected mode, and send described low level signal;
When described Real-time Collection to this side station in 1/3rd while being greater than the second default current threshold of three-phase electricity flow valuve summation in the three-phase electricity flow valuve of bus, determine that work at present pattern is the zero-sequenceprotection pattern in protected mode, and send described low level signal;
When described Real-time Collection to this side station in when arbitrary current value is less than 1/3rd of described the first default current threshold and three-phase electricity flow valuve summation and is less than described the second default current threshold in the three-phase electricity flow valuve of bus, determine that work at present pattern is normal mode, and send described high level signal.
Wherein, describedly between the circuit of bussed supply, can realize while switching in to described side station, the size of the three-phase voltage value of described the side station electric power incoming line arriving according to described Real-time Collection and offside station electric power incoming line, determine that enabling bus in described side station electric power incoming line or described offside station comprises to the concrete steps of bussed supply in described side station:
When described Real-time Collection to described side station while being less than by least one phase voltage value in the three-phase voltage value of electric power incoming line in the three-phase voltage value of default voltage threshold and described offside station electric power incoming line that each phase voltage value is all greater than described default voltage threshold, determine and enable bus to bussed supply in described side station at described offside the station in;
When described Real-time Collection to described side station when in electric power incoming line three-phase voltage value, each phase voltage value is all greater than default voltage threshold, determine and enable described side station electric power incoming line to bussed supply in described side station.
Implement the embodiment of the present invention, there is following beneficial effect:
1, in embodiments of the present invention, because the current transformer in device is based on Luo-coil, net weight is extremely low, installation is simple and convenient disassembly, has overcome conventional current instrument transformer installation site and has fixed, and dismantles difficult shortcoming.
2, in embodiments of the present invention; owing to containing sampling unit, protected location and logic control element in device; it is simple in structure, be convenient to safeguard; and sampling unit is completely independent; be convenient to the rapid installation and debugging of O&M personnel; avoided the risk of the long-time decompression of bus in this side station, the while is with the defencive function of zero-sequenceprotection and overcurrent protection.
3, in embodiments of the present invention, because can being arranged on arbitrary Substation Station using electricity system bus, device exchanges in inlet wire screen, it substitutes traditional backup auto-activating device when urgent, has overcome traditional approach deposit spare part and has caused the wasting of resources, long drawback of turnaround time.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, the accompanying drawing that obtains other according to these accompanying drawings still belongs to category of the present invention.
Fig. 1 is the application scenarios schematic diagram of the main offside station power use system of 380V backup auto-activating device in prior art;
The structural representation of the emergent device of Substation Station using electricity system prepared auto restart that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is the structural representation of logic control element in Fig. 2;
The flow chart of the emergent method of Substation Station using electricity system prepared auto restart that Fig. 4 provides for the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 2, the embodiment of the present invention provides a kind of Substation Station using electricity system prepared auto restart emergent device, be arranged in the inlet wire screen in arbitrary Substation Station, realize the switching between the power supply of this side station power supply and offside station, easy for narrating, below to be arranged at the emergent device of the station power use system prepared auto restart at this side station as example explanation.The emergent device of Substation Station using electricity system prepared auto restart in the embodiment of the present invention, this device comprises sampling unit 1, protected location 2, switching transistor 3 and logic control element 4; Wherein,
One end of sampling unit 1 is connected with one end of protected location 2, and the other end is connected with the source S of switching transistor 3, and it comprises this side K switch 1, bus connection switch K2, voltage sample module 11 and current sample module 12; Wherein, the two ends of this side K switch 1 are connected with bus c in electric power incoming line a, this side station for this side station respectively; One end of bus connection switch K2 is connected with bus d in offside station, and the other end is connected with bus c in this side station; The two ends of voltage sample module 11 are connected with electric power incoming line b with electric power incoming line a, offside station for this side station respectively, the three-phase voltage value for this side of Real-time Collection station with electric power incoming line a and offside station electric power incoming line b; Current sample module 12 is connected with bus c in this side station, for the three-phase electricity flow valuve of bus c in this side of Real-time Collection station;
The other end of protected location 2 is connected with the grid G of switching transistor 3, be used for the size of the three-phase electricity flow valuve of bus c in this side station of arriving according to Real-time Collection, determine work at present pattern, and send corresponding level signal according to definite work at present pattern to switching transistor 3; Wherein, work at present pattern comprises protected mode and normal mode, and level signal corresponding to protected mode is low level signal, and the level signal that normal mode is corresponding is high level signal;
The drain D andlogic control unit 4 of switching transistor 3 is connected, and for the height of the level signal that sends according to protected location 2, realizes conducting or disconnection between sampling unit 1 andlogic control unit 4;
Logic control element 4, for when with sampling unit 1 conducting, the size of the three-phase voltage value of electric power incoming line a and offside station electric power incoming line b for this side station of arriving according to Real-time Collection, determines and enables this side station electric power incoming line a or offside station electric power incoming line b.
It should be noted that the voltage of bus d in the voltage voltage that processing obtains through transformation by this side station electric power incoming line a or offside station can meet the voltage instructions for use of bus c in this side station.
In whole device, voltage sample module 11 in sampling unit 1 comprises six voltage fuses, wherein there are three voltage fuses for the three-phase voltage value of this side of Real-time Collection station electric power incoming line a, these three voltage fuses are connected with the three-phase inlet wire of power supply one by one with this side station respectively, also there are in addition three voltage fuses for the three-phase voltage value of Real-time Collection offside station electric power incoming line b, they are also connected with the three-phase inlet wire of power supply with offside station respectively one by one, the structure of these six voltage fuses is all identical, and can gather the scope of magnitude of voltage all between 0V to 460V.
Current sample module 12 in sampling unit 1 comprises three current transformers for the three-phase electricity flow valuve of bus c in this side of Real-time Collection station, these three current transformers are the current transformer based on Luo-coil, and respectively with this side station in the threephase cable of bus c be socketed one by one, can gather the scope of current value all between 0A to 2500A.Because the net weight of each current transformer is extremely low, simple and convenient disassembly are installed, having overcome conventional current instrument transformer installation site fixes, dismantle difficult shortcoming, therefore there is the sampling unit 1 of standalone module and switch designs, it is simple in structure, be convenient to the rapid installation and debugging of O&M personnel, avoided the risk of the long-time decompression of this side station power use system bus c.
No matter this side K switch 1 closure at this side station and bus connection switch K2 disconnect, by this side station with reliable and stable 380V AC power being provided to after electric power incoming line a transformation bus c in this side station, or this side K switch 1 at this side station disconnects and bus connection switch K2 closure, reliable and stable 380V AC power is provided to bus c in this side station by bus d in offside station, current sample module 12 in sampling unit 1 all can Real-time Collection to the three-phase electricity flow valuve of bus c in this side station, protected location 2 arrives the size of the three-phase electricity flow valuve of bus c in this side station according to sampling module 12 Real-time Collections, determine work at present pattern, and send corresponding level signal according to definite work at present pattern to switching transistor 3.
When Real-time Collection to this side station in when arbitrary current value is greater than the first current threshold default in protected location 2 in the three-phase electricity flow valuve of bus c, protected location 2 enters overcurrent protection pattern, controlling this side K switch 1 disconnects, and send low level signal to switching transistor 3, switching transistor 3 is disconnected, realize between sampling unit 1 andlogic control unit 4 and disconnecting; When Real-time Collection to this side station in 1/3rd while being greater than the second current threshold default in protected location 2 of three current value summations in the three-phase electricity flow valuve of bus c, protected location 2 enters zero-sequenceprotection pattern, controlling this side K switch 1 disconnects, and send low level signal to switching transistor 3, switching transistor 3 is disconnected, realize between sampling unit 1 andlogic control unit 4 and disconnecting; When aforementioned above two kinds of protected modes are enabled, all can cut off the connection between sampling unit 1 andlogic control unit 4, power to bus c in this side station thereby interrupt bus d in this side station electric power incoming line a and offside station, the prepared auto restart handoff functionality of this device of locking.
When Real-time Collection to this side station in the three-phase electricity flow valuve of bus c arbitrary current value be less than the first current threshold default in protected location 2; and when 1/3rd of three-phase electricity flow valuve summation is less than the second current threshold default in protected location 2; protected location 2 keeps current normal mode; and send high level signal to switching transistor 3; make switching transistor 3 closures, realize conducting between sampling unit 1 andlogic control unit 4.Should be noted that; get back to normal mode again after protected location 2 is enabled protected mode time; no matter enable this side station electric power incoming line a or enable bus d in offside station and power to bus c in this side station, in this side station, bus c supply power mode all can remain at protected location 2 and enable the supply power mode before protected mode.
For when with sampling unit 1 conducting; logic control element 4 can be realized the change of controlling this side K switch 1 and bus connection switch K2 open and-shut mode; thereby reach while realizing the electric power incoming line a inefficacy of this side station; can be switched to the effect of bus d in offside station; as shown in Figure 3, in device, adopt a relay protection circuit to carry out design logic control unit 4.This logic control element 4 comprises the first voltage relay J1, second voltage relay J 2, auxiliary relay J3 and direct voltage source 31; Wherein, the first voltage relay J1, second voltage relay J 2 and auxiliary relay J3 three are in series into a relay protection circuit, and this circuit being in series and direct voltage source 31 are in parallel;
The first voltage relay J1, when with sampling unit 1 conducting, the size of the three-phase voltage value of electric power incoming line a for this side station of arriving according to Real-time Collection, determines in disconnecting or closure state;
Second voltage relay J 2, when with sampling unit 1 conducting, the size of the three-phase voltage value of electric power incoming line b for the offside station of arriving according to Real-time Collection, determines in disconnecting or closure state;
Auxiliary relay J3, while being used for sampling unit 1 conducting, according to the first relay J 1 of determining and the open and-shut mode of the second relay J 2, determine in disconnecting or closure state, realize the control of the open and-shut mode to this side K switch 1 and bus connection switch K2, thereby determine that enabling bus d in this side station electric power incoming line a or offside station powers to bus c in this side station.
With sampling unit 1 conducting, and Real-time Collection to this side station while being less than with at least one magnitude of voltage in the three-phase voltage value of electric power incoming line a in the three-phase voltage value of predetermined voltage threshold and offside station electric power incoming line b that each magnitude of voltage is all greater than predetermined voltage threshold, the first voltage relay J1 and second voltage relay J 2 are all closed, make auxiliary relay J3 closure, thereby the aforementioned circuit being in series forms a connection circuit, auxiliary relay J3 controls this side K switch 1 and disconnects and control bus connection switch K2 closure, determine that enabling bus d in offside station powers to bus c in this side station.
With sampling unit 1 conducting, and Real-time Collection to this side station when in the three-phase voltage value of electric power incoming line a, each magnitude of voltage is all greater than predetermined voltage threshold, the first voltage relay J1 disconnects, auxiliary relay J3 is disconnected, thereby the aforementioned circuit being in series is off-state, auxiliary relay J3 controls this side K switch 1 closure and controls bus connection switch K2 and disconnects, and determines and enables this side station electric power incoming line a to bus c power supply in this side station.
Further, direct voltage source 31 comprises 110V DC power supply and 220V DC power supply, in the time adopting 220V DC power supply, needs an electric pressure converter for 220V direct voltage is transformed into 110V direct voltage.
As an example, three voltage fuses are installed to this side station with on the inlet wire cable of power supply, gather three-phase voltage value U11, U12, the U13 of this side station electric power incoming line a, three voltage fuses are installed at offside station with on the inlet wire cable of power supply, gather three-phase voltage value U21, U22, the U23 of offside station electric power incoming line b, and three current transformers to be installed in this side station 380V bus c upper, gather three-phase electricity flow valuve Ia, Ib, the Ic of 380V bus c in this side station;
When any current value in the three-phase electricity flow valuve Ia of bus c in collected this side station, Ib, Ic is greater than built-in overcurrent protection definite value (being greater than the first default current threshold), overcurrent protection starts, controlling this side K switch 1 disconnects, send low level signal to switching transistor 3, switching transistor 3 is disconnected, realize between sampling unit 1 andlogic control unit 4 and disconnecting, the prepared auto restart handoff functionality of locking device; When 1/3rd of three-phase electricity flow valuve Ia, the Ib of collected bus c, Ic tri-current value summations are greater than built-in zero-sequenceprotection definite value (being greater than the second default current threshold), zero-sequenceprotection starts, control this side K switch 1, send low level signal to switching transistor 3, switching transistor 3 is disconnected, realize between sampling unit 1 andlogic control unit 4 and disconnecting, the prepared auto restart handoff functionality of locking device;
Between sampling unit 1 andlogic control unit 4 when conducting, device can be realized prepared auto restart handoff functionality, as the three-phase voltage value U11 of electric power incoming line a for collected this side station, U12, in U13, at least one magnitude of voltage is less than predetermined voltage threshold (as drop to primary voltage value 20%), the first voltage relay J1 closure, the three-phase voltage value U21 of electric power incoming line b for the offside station collecting, U22, U23 voltage is normal, be U21, U22, U23 is all greater than predetermined voltage threshold, now second voltage relay J 2 closures, due to the first voltage relay J1 and all closures of second voltage relay J 2, make auxiliary relay J3 by excitation and closure, now auxiliary relay J3 and the first voltage relay J1, second voltage relay J 2 and direct voltage source 31 form a connection circuit, thereby auxiliary relay J3 controls this side K switch 1 to be disconnected and controls bus connection switch K2 closure, device will switch to bus d in offside station and power to bus c in this side station, when collected this side station uses three-phase voltage value U11, U12, the U13 voltage of electric power incoming line a normal, be that U11, U12, U13 are all greater than predetermined voltage threshold, the first voltage relay J1 disconnects, auxiliary relay J3 is disconnected, the circuit that auxiliary relay J3 and the first voltage relay J1, second voltage relay J 2 and direct voltage source 31 form is off-state, thereby auxiliary relay J3 controls this side K switch 1 closure and controls bus connection switch K3 and disconnects, and device will switch back this side station electric power incoming line a to bus c power supply in this side station.
As shown in Figure 4, the embodiment of the present invention also provides a kind of Substation Station using electricity system prepared auto restart emergent method, and it realizes in the emergent device of aforementioned Substation Station using electricity system prepared auto restart, and described method comprises:
The three-phase electricity flow valuve of bus in the three-phase voltage value of step S101, this side of Real-time Collection station use electric power incoming line, the three-phase voltage value that electric power incoming line is used at offside station and this side station;
In step S102, described side station arriving according to described Real-time Collection, the size of the three-phase electricity flow valuve of bus, determines work at present pattern, and sends corresponding level signal according to described definite work at present pattern; Wherein, described work at present pattern comprises protected mode and normal mode, and level signal corresponding to described protected mode is low level signal, and the level signal that described normal mode is corresponding is high level signal;
Detailed process is, protected mode comprises overcurrent protection pattern and zero-sequenceprotection pattern, when Real-time Collection to this side station in when arbitrary current value is greater than the first default current threshold in the three-phase electricity flow valuve of bus, determine that work at present pattern is overcurrent protection pattern, and send low level signal; When Real-time Collection to this side station in 1/3rd while being greater than the second default current threshold of three-phase electricity flow valuve summation in the three-phase electricity flow valuve of bus, determine that work at present pattern is zero-sequenceprotection pattern, and send low level signal; When Real-time Collection to this side station in when arbitrary current value is less than 1/3rd of the first default current threshold and three-phase electricity flow valuve summation and is less than the second default current threshold in the three-phase electricity flow valuve of bus, determine that work at present pattern is normal mode, and send high level signal.
Step S103, receive the level signal of described transmission, and according to the height of the described level signal receiving, judge to the switch instances between the circuit of bussed supply in described side station;
Detailed process is, in the time that the level signal receiving is high level signal, between the circuit to bussed supply in this side station, can realize switching; In the time that the level signal receiving is low level signal, between the circuit to bussed supply in this side station, can not realize switching.
Step S104, when realizing between the circuit of giving bussed supply in described side station while switching, the size of the three-phase voltage value of electric power incoming line and offside station electric power incoming line for described side station arriving according to described Real-time Collection, determines and enables in described side station electric power incoming line or described offside station bus to bussed supply in described side station.
Detailed process is, between the circuit of giving bussed supply in this side station, can realize switching, and Real-time Collection to this side station while being less than by least one phase voltage value in the three-phase voltage value of electric power incoming line in the three-phase voltage value of default voltage threshold and offside station electric power incoming line that each phase voltage value is all greater than default voltage threshold, determine and enable bus to bussed supply in this side station at offside the station in;
Between the circuit of giving bussed supply in this side station, can realize switching, and Real-time Collection to this side station when in electric power incoming line three-phase voltage value, each phase voltage value is all greater than default voltage threshold, determine and enable this side station electric power incoming line to bussed supply in this side station.
Implement the embodiment of the present invention, there is following beneficial effect:
1, in embodiments of the present invention, because the current transformer in device is based on Luo-coil, net weight is extremely low, installation is simple and convenient disassembly, has overcome conventional current instrument transformer installation site and has fixed, and dismantles difficult shortcoming.
2, in embodiments of the present invention; owing to containing sampling unit, protected location and logic control element in device; it is simple in structure, be convenient to safeguard; and sampling unit is completely independent; be convenient to the rapid installation and debugging of O&M personnel; avoided the risk of the long-time decompression of bus in this side station, the while is with the defencive function of zero-sequenceprotection and overcurrent protection.
3, in embodiments of the present invention, because can being arranged on arbitrary Substation Station using electricity system bus, device exchanges in inlet wire screen, it substitutes traditional backup auto-activating device when urgent, has overcome traditional approach deposit spare part and has caused the wasting of resources, long drawback of turnaround time.
It should be noted that in said system embodiment, each included system unit is just divided according to function logic, but is not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional unit also, just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method is can carry out the hardware that instruction is relevant by program to complete, described program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk, CD etc.
Above disclosed is only a kind of preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the claims in the present invention, still belongs to the scope that the present invention is contained.
Claims (10)
1. the emergent device of Substation Station using electricity system prepared auto restart, is characterized in that, comprises sampling unit, protected location, switching transistor and logic control element; Wherein,
One end of described sampling unit is connected with one end of described protected location, and the other end is connected with the source electrode of described switching transistor, and it comprises this side switch, bus connection switch, voltage sample module and current sample module; Wherein, the two ends of described side switch respectively with this side for station in electric power incoming line, this side station bus be connected; One end of described bus connection switch is connected with bus in offside station, and the other end is connected with bus in described side station; The two ends of described voltage sample module are connected with electric power incoming line in electric power incoming line, offside station for station with described side respectively, the three-phase voltage value for this side station described in Real-time Collection with electric power incoming line and offside station electric power incoming line; Described current sample module is connected with bus in described side station, for the three-phase electricity flow valuve of bus in this side station described in Real-time Collection;
The other end of described protected location is connected with the grid of described switching transistor, be used for the size of the three-phase electricity flow valuve of bus in described the side station of arriving according to described Real-time Collection, determine work at present pattern, and send corresponding level signal according to described definite work at present pattern to described switching transistor; Wherein, described work at present pattern comprises protected mode and normal mode, and level signal corresponding to described protected mode is low level signal, and the level signal that described normal mode is corresponding is high level signal;
The drain electrode of described switching transistor is connected with described logic control element, for according to the height of the level signal of described protected location transmission, realizes conducting or disconnection between described sampling unit and described logic control element;
Described logic control element, while being used for described sampling unit conducting, the size of the three-phase voltage value of electric power incoming line and offside station electric power incoming line for described side station arriving according to described Real-time Collection, determines and enables in described side station electric power incoming line or described offside station bus to bussed supply in described side station.
2. the emergent device of Substation Station using electricity system prepared auto restart as claimed in claim 1, is characterized in that, described logic control element comprises the first voltage relay, second voltage relay, auxiliary relay and direct voltage source; Wherein, described the first voltage relay, second voltage relay and auxiliary relay three are in series into a circuit, and described in the circuit and the described direct voltage source that are in series be in parallel;
Described the first voltage relay, when with described sampling unit conducting, the size of the three-phase voltage value of described the side station electric power incoming line arriving according to described Real-time Collection, determines in disconnecting or closure state;
Described second voltage relay, when with described sampling unit conducting, the size of the three-phase voltage value of electric power incoming line for the described offside station of arriving according to described Real-time Collection, determines in disconnecting or closure state;
Described auxiliary relay, while being used for described sampling unit conducting, according to the open and-shut mode of described the first definite voltage relay and second voltage relay, determine in disconnecting or closure state, realize the control of open and-shut mode to described side switch and bus connection switch, thereby determine and enable in described side station electric power incoming line or described offside station bus to bussed supply in described side station.
3. the emergent device of Substation Station using electricity system prepared auto restart as claimed in claim 2, it is characterized in that, when with described sampling unit conducting, and described Real-time Collection to described side station while being less than by least one phase voltage value in the three-phase voltage value of electric power incoming line in the three-phase voltage value of default voltage threshold and described offside station electric power incoming line that each phase voltage value is all greater than described default voltage threshold, described the first voltage relay and described voltage the second relay are all closed, make described auxiliary relay closure, thereby described in the circuit that is in series form a connection circuit, described in described auxiliary relay control, this side switch disconnects and controls described bus connection switch closure, determine and enable bus to bussed supply in described side station at described offside the station in.
4. the emergent device of Substation Station using electricity system prepared auto restart as claimed in claim 2, it is characterized in that, when with described sampling unit conducting, and described Real-time Collection to described side station when in electric power incoming line three-phase voltage value, each phase voltage value is all greater than default voltage threshold, described the first voltage relay disconnects, described auxiliary relay is disconnected, thereby described in the circuit that is in series be off-state, described in described auxiliary relay control, this side switch is closed and control described bus connection switch and disconnect, determine and enable described side station electric power incoming line to bussed supply in described side station.
5. the emergent device of Substation Station using electricity system prepared auto restart as claimed in claim 1, is characterized in that, described protected mode comprises overcurrent protection pattern and zero-sequenceprotection pattern; Wherein,
When described Real-time Collection to this side station in when arbitrary current value is greater than the first default current threshold in the three-phase electricity flow valuve of bus, described protected location enters overcurrent protection pattern, controlling described side switch disconnects, and send low level signal to described switching transistor, described switching transistor is disconnected, realize between described sampling unit and described logic control element and disconnecting;
When described Real-time Collection to this side station in 1/3rd while being greater than the second default current threshold of three-phase electricity flow valuve summation in the three-phase electricity flow valuve of bus; described protected location enters zero-sequenceprotection pattern; controlling described side switch disconnects; and send low level signal to described switching transistor; described switching transistor is disconnected, realize between described sampling unit and described logic control element and disconnecting.
6. the emergent device of Substation Station using electricity system prepared auto restart as described in any one in claim 1 to 5, it is characterized in that, described current sample module comprises three current transformers, described three current transformers are the current transformer based on Luo-coil, respectively with described side station in the threephase cable of bus be socketed one by one.
7. the emergent device of Substation Station using electricity system prepared auto restart as claimed in claim 6, it is characterized in that, described voltage sample module comprises six voltage fuses, wherein, three voltage fuses are connected with the three-phase inlet wire of power supply one by one with described side station respectively, and another three voltage fuses are connected with the three-phase inlet wire of power supply one by one with described offside station respectively.
8. the emergent method of Substation Station using electricity system prepared auto restart, is characterized in that, it realizes in the emergent device of the Substation Station using electricity system prepared auto restart as described in any one in claim 1 to 7, and described method comprises:
The three-phase electricity flow valuve of bus in the three-phase voltage value of this side of Real-time Collection station use electric power incoming line, the three-phase voltage value that electric power incoming line is used at offside station and this side station;
In described the side station of arriving according to described Real-time Collection, the size of the three-phase electricity flow valuve of bus, determines work at present pattern, and sends corresponding level signal according to described definite work at present pattern; Wherein, described work at present pattern comprises protected mode and normal mode, and level signal corresponding to described protected mode is low level signal, and the level signal that described normal mode is corresponding is high level signal;
Receive the level signal of described transmission, and according to the height of the described level signal receiving, judge to the switch instances between the circuit of bussed supply in described side station;
In the time can realizing switching between the circuit of giving bussed supply in described side station, the size of the three-phase voltage value of electric power incoming line and offside station electric power incoming line for described side station arriving according to described Real-time Collection, determines and enables in described side station electric power incoming line or described offside station bus to bussed supply in described side station.
9. method as claimed in claim 8, it is characterized in that, in described described the side station of arriving according to described Real-time Collection, the size of the three-phase electricity flow valuve of bus, determines work at present pattern, and the concrete steps that send corresponding level signal according to described definite work at present pattern comprise:
When described Real-time Collection to this side station in when arbitrary current value is greater than the first default current threshold in the three-phase electricity flow valuve of bus, determine that work at present pattern is the overcurrent protection pattern in protected mode, and send described low level signal;
When described Real-time Collection to this side station in 1/3rd while being greater than the second default current threshold of three-phase electricity flow valuve summation in the three-phase electricity flow valuve of bus, determine that work at present pattern is the zero-sequenceprotection pattern in protected mode, and send described low level signal;
When described Real-time Collection to this side station in when arbitrary current value is less than 1/3rd of described the first default current threshold and three-phase electricity flow valuve summation and is less than described the second default current threshold in the three-phase electricity flow valuve of bus, determine that work at present pattern is normal mode, and send described high level signal.
10. method as claimed in claim 8, it is characterized in that, describedly between the circuit of bussed supply, can realize while switching in to described side station, the size of the three-phase voltage value of described the side station electric power incoming line arriving according to described Real-time Collection and offside station electric power incoming line, determine that enabling bus in described side station electric power incoming line or described offside station comprises to the concrete steps of bussed supply in described side station:
When described Real-time Collection to described side station while being less than by least one phase voltage value in the three-phase voltage value of electric power incoming line in the three-phase voltage value of default voltage threshold and described offside station electric power incoming line that each phase voltage value is all greater than described default voltage threshold, determine and enable bus to bussed supply in described side station at described offside the station in;
When described Real-time Collection to described side station when in electric power incoming line three-phase voltage value, each phase voltage value is all greater than default voltage threshold, determine and enable described side station electric power incoming line to bussed supply in described side station.
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