CN103117537B - Power distribution network area protection method and system - Google Patents
Power distribution network area protection method and system Download PDFInfo
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- CN103117537B CN103117537B CN201310079399.2A CN201310079399A CN103117537B CN 103117537 B CN103117537 B CN 103117537B CN 201310079399 A CN201310079399 A CN 201310079399A CN 103117537 B CN103117537 B CN 103117537B
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Abstract
The invention discloses a power distribution network area protection method and system and solves the technical problem of quickly and accurately detecting faults of a power distribution network and isolating the faults. The method comprises: arranging a line protection terminal on a section switch of a main line, and arranging an area protection terminal in a converting station or a switching station of the main line; and the lien protection terminal and the area protection terminal are networked to communicate to respectively achieve differential protection of sectional main line and backup protection of a power distribution network main line. By means of the system, the section switch of the main line is connected with the line protection terminal, the area protection terminal is arranged in the converting station or the switching station of the main line, and the line protection terminal and the area protection terminal are networked. Compared with the prior art, the line protection terminal and the area protection terminal are networked to communicate, sampling is synchronous, differential protection and backup protection are achieved, power supply reliability of the distribution network is effectively improved, safe running of an electric system is guaranteed, and the power distribution network area protection method and system are suitable for traditional power distribution networks and intelligent power grid power distribution networks.
Description
Technical field
The present invention relates to fault detection method and the system of a kind of guard method and system of electric power system, particularly a kind of power distribution network.
Background technology
Along with rapid development of economy, society is increasing to the demand of electric power, and the requirement of power consumer to aspects such as the power supply reliability of power distribution network, the quality of power supply, operating efficiency and good services is also more and more higher.Utilize modern electronic technology, the communication technology, computer techno-stress technology, the work management of the monitoring of power distribution network under normal and accident conditions, protection, control, metering and power supply department is organically merged and improves the development trend that power supply quality is intelligent grid.
Distribution protection control appliance and system can fast detecting to electric network fault or abnormal operating condition, and make disposal rapidly, this safe and stable operation for power distribution network has important effect.The distribution protection control appliance of prior art or the situation that distribution net work structure complexity, operational mode are changeable, protection definite value cannot be adjusted cannot be adapted to; related investment is huge, power distribution network is difficult to bear, and therefore can not be adapted to the distribution network failure detection control in various Complicated Distribution Network framework situation.
Summary of the invention
The object of this invention is to provide a kind of power distribution network locality protection method and system, the technical problem that solve is the fault of the detection power distribution network of quickly, efficiently and accurately and isolated fault.
The present invention is by the following technical solutions: a kind of power distribution network locality protection method, comprises the following steps:
One, install route protection terminal in each block switch on the backbone of power distribution network or box-type substation, backbone is divided into section by block switch, installation region protection terminal in the transformer station or switching station of the backbone of power distribution network;
Two, route protection terminal and locality protection terminal set up communication linkage by communication network; A main equipment is set in route protection terminal and locality protection terminal, as the control source of sampling clock, makes All other routes protect terminal consistent with main equipment with the clock of locality protection terminal;
Three, route protection terminal realizes the differential protection of section backbone: each route protection terminal of this section gathers the analog signal of the voltage and current of respective block switch respectively, after being converted to digital signal, it is sent to the route protection terminal of the boundary switch configuration being in each side of same section, each route protection terminal calculates differential current and the stalling current of this section, when differential current is greater than set point with the ratio of stalling current, this route protection terminal is thought has fault in section, control this boundary switch of tripping, set point is the rated current of 0.5 times of circuit;
Locality protection terminal realizes the backup protection of power distribution network backbone and attached branch line thereof: after the of ac information at route protection terminal collection switch place and switching value information are converted to digital signal, send to locality protection terminal, locality protection terminal calculates the fault characteristic signals of protected object section, detect in each side electric current of certain section on protected circuit and only have side that overcurrent occurs, route protection terminal then to each boundary switch configuration of this backbone section sends trip signal, after route protection terminal receives the trip signal of locality protection terminal, control boundary switch tripping, isolated fault point.
Block switch quantity on method backbone of the present invention is: 1≤block switch quantity≤3.
There is "T"-shaped connection branch line in method backbone of the present invention, "T"-shaped junction backbone both sides, on branch line, be respectively equipped with block switch.
Method route protection terminal of the present invention and locality protection terminal set up communication linkage by ethernet passive optical network.
The ethernet communication port of method route protection terminal of the present invention and locality protection terminal is linked into the ethernet communication port of passive optical network unit by ethernet communication line, the passive optical-fiber network port of passive optical network unit is connected to optical line terminal by multimode fiber.
Method of ac information of the present invention is voltage, current-mode analog quantity information: the voltage A phase of block switch, voltage B phase, voltage C phase, electric current A phase, electric current B phase, electric current C phase; Described switching value information is remote tripping signal, distant place switching signal, fault message signal, protection starting signal, differential marking signal, current transformer circuit supervision fail signal, protection exit signal.
Method differential current of the present invention is the phasor sum of each boundary switch electric current of section, and stalling current is the modulus value sum of each boundary switch of section.
Method route protection terminal of the present invention thinks there is fault in section, controls through being no less than 100 these boundary switch of millisecond time-delay tripping.
A kind of power distribution network area protection system, described power distribution network area protection system, the backbone of power distribution network arranges block switch, "T"-shaped junction backbone both sides, on branch line, be respectively equipped with block switch, route protection terminal is connected with in block switch or box-type substation, the of ac information gathering port of route protection terminal is connected to voltage signal and current signal output end of block switch or box-type substation respectively, and the On-off signal port of route protection terminal is connected to the switching signal lead-out terminal of block switch by cable; Configuring area protection terminal in the transformer station or switching station of the backbone of power distribution network; Described route protection terminal and locality protection terminal form network service and are connected; a main equipment is set in route protection terminal and locality protection terminal; main equipment sends sampling synchronization pulse message to other route protection terminal and locality protection terminal, makes the clock of each terminal consistent with main equipment.
System segment number of switches of the present invention is: 1≤block switch quantity≤3; Described route protection terminal and locality protection terminal form ethernet passive optical network communication connection.
The present invention compared with prior art, route protection terminal and locality protection terminal are established a communications link by communication network, the sampling of main equipment control synchronization is set, route protection terminal gathers the analog signal of the voltage and current of block switch, after being converted to digital signal, it is sent to the route protection terminal of the boundary switch configuration being in each side of same section, each route protection terminal calculates by the differential current of this section and stalling current, when differential current is greater than set point with the ratio of stalling current, this route protection terminal is thought has fault in section, control this boundary switch of tripping, locality protection terminal realizes the backup protection of power distribution network backbone and attached branch line thereof, the power supply reliability of effective raising distribution network, the fault realizing distrbution network automatically detects and isolates, ensure safe operation of power system, be applicable to conventional electrical distribution network and intelligent grid distribution network simultaneously.
Accompanying drawing explanation
Fig. 1 is the configuration frame schematic diagram of the embodiment of the present invention.
Fig. 2 is clock synchronous figure.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Power distribution network locality protection method of the present invention, comprises line differential protection and region backup protection two parts, comprises the following steps:
On the shaft tower of each block switch installation place of, installing on the backbone of power distribution network or route protection terminal is installed in box-type substation, installation region protection terminal in the transformer station or switching station of the backbone of power distribution network.Route protection terminal and locality protection terminal are all connected in ethernet passive optical network EPON by ethernet communication line, carry out information exchange between each route protection terminal, locality protection terminal by IEC61850 agreement.
Power distribution network is step down side outlet this part of electrical network to user of electric power system 110kV transformer station.In power distribution network, the circuit connected between Liang Ge transformer station is backbone, and the circuit from backbone to user is branch line.As shown in Figure 1, in the present embodiment, the circuit connected between transformer station 1 and transformer station 2 is backbone, and block switch 1 and the circuit belonging to block switch 6 are branch line.According to the balance principle of power distribution network performance driving economy and reliability, the backbone of power distribution network arranges block switch.Consider economy, the block switch on a backbone should not be arranged too much, and increase is invested by too much block switch; Consider reliability, the node both sides that each backbone is connected with branch line all should configure block switch, could ensure the power supply reliability of branch line completely.According to the engineering philosophy of electric power enterprise, the block switch quantity on a backbone is generally no more than three, 1≤block switch quantity≤3.The backbone of power distribution network is divided into several sections by block switch, and power distribution network is boundary demarcation section by block switch, and these block switches are also called the boundary switch of this section.Each block switch is the boundary switch of its both sides section.Each section is a protected object, and section constitutes the part of backbone.If there is the situation of "T"-shaped connection branch line in backbone, "T"-shaped junction backbone both sides, on branch line, be respectively equipped with block switch.As shown in Figure 1, in the present embodiment, the block switch 1 of section 1, block switch 2 and block switch 5, the block switch 2 of section 2, block switch 3 and block switch 6.
Route protection terminal is for the protection of the section on power distribution network backbone.When power distribution network backbone breaks down, the action at once of route protection terminal, controls, by location, fault point section boundary switch tripping (disconnection), fault point to be isolated.Route protection terminal presses block switch configuration, with block switch one_to_one corresponding.If fault point is on some sections, then the route protection terminal of the boundary switch configuration that this section is all will be worked in coordination, and completes the segregate action of fault.Each route protection terminal gathers of ac information and the switching value information of the block switch of corresponding configuration, after these information analog-to-digital conversion, is sent to the route protection terminal of other each boundary switch of this section by ethernet passive optical network.The information of comprehensive protected each boundary switch of section of each route protection terminal of this section, completes the task of this section of protection.
Locality protection terminal, for the protection of a backbone of power distribution network and attached branch line thereof, forms the backup protection equipment of power distribution network.When power distribution network backbone breaks down, if route protection terminal fails to control block switch action at once, the then action after time delay of locality protection terminal, control circuit protection terminal, by the section boundary switch tripping of location, fault point, makes fault point be isolated.These information in the of ac information of block switch and switching value information, and are sent to the locality protection terminal of this section place backbone by route protection terminal acquisition configuration by ethernet passive optical network.The information of the comprehensive protected circuit of locality protection terminal, completes this backbone task of protection.
Two, the ethernet communication port of route protection terminal and locality protection terminal is linked into passive optical network unit ONU(Optical Network Unit nearby by ethernet communication line) ethernet communication port, the passive optical-fiber network PON port of each ONU is connected to optical line terminal OLT (optical line terminal) by multimode fiber.More than OLT and one ONU forms a set of ethernet passive optical network EPON.Connect that each route protection terminal in an epon and locality protection terminal share that each route protection terminal and locality protection terminal gather of ac and switching value information.
Route protection terminal presses the configuration of block switch one_to_one corresponding, is responsible for the section of these block switch both sides of protection.Except ethernet communication port, the of ac collection port of route protection terminal and switch acquisition port are connected to each terminal of block switch all respectively.Route protection terminal carries out the collection of of ac information and switching value information in real time in each sampling interval, is sent to route protection terminal corresponding to other boundary switch of block switch both sides section and locality protection terminal corresponding to this block switch place backbone after analog-to-digital conversion by EPON network.After the of ac information of route protection terminal collection and switching value information are converted to digital signal, communicate by the 9-2 section regulation of IEC61850 standard communication protocol.Of ac information is voltage, current-mode analog quantity information, is specially: the voltage A phase Ua of block switch, voltage B phase Ub, voltage C phase Uc, electric current A phase Ia, electric current B phase Ib, electric current C phase Ic.Switching value information is remote tripping signal, distant place switching signal, fault message signal, protection starting signal, differential marking signal, current transformer TA disconnection signal, protection exit signal.Of ac information is for calculating differential current, stalling current, and switching value information is used for the control of malfunction conversion.A distant place refers to the route protection terminal that other boundary switch except this boundary switch of this section are corresponding and locality protection terminal corresponding to this section place backbone.
In the route protection terminal and locality protection terminal of power distribution network, arrange a main equipment, as the control source of sampling clock, All other routes protection terminal and locality protection terminal all start sampling according to the sampling pulse of main equipment.Main equipment is provided with the clock timer of self, and sets interval according to timer, to power distribution network other route protection terminal and locality protection terminal send sampling pulse.Main equipment sends to the sampling pulse message of each route protection terminal and locality protection terminal; forward via OLT; the time delay that main equipment sends to OLT is unfixed; OLT receives pulse message and is transmitted to each route protection terminal and locality protection terminal, and the time that each route protection terminal and locality protection terminal receive pulse message is synchronous.
Three, route protection terminal realizes the differential protection of backbone section, and locality protection terminal realizes the backup protection of power distribution network whole piece backbone and attached branch line thereof.
A corresponding block switch of route protection terminal, participate in the differential protection of block switch both sides section, therefore need to have the function of simultaneously carrying out two groups of differential protection Logic judgment, the order of judgement is the direction from mains side to load side.The situation that "T"-shaped connection connects branch line is had in power distribution network backbone; if branch line is with the block switch being configured with route protection terminal; then this branch line participates in section differential protection Logic judgment belonging to backbone; namely require that route protection terminal has the function of multiterminal differential protection Logic judgment; the order judged is the direction from mains side to load side, branch line after first backbone.
Route protection terminal realizes the differential protection of certain section backbone: each route protection terminal of this section gathers the analog signal of the voltage and current at respective block switch place respectively; according to IEC61850 standard, it is sent to the All other routes protection terminal of the boundary switch configuration being in the same each side of protected section after being converted to digital signal, realizes voltage, current data that each route protection terminal shares each side of protected object section.Each route protection terminal calculates differential current and the stalling current of protected object section, and differential current is the phasor sum of each boundary switch electric current of section, and stalling current is the modulus value sum of each boundary switch of section.When differential current is greater than set point with the ratio of stalling current; this route protection terminal is thought has fault in section; control directly or through being no less than 100 these boundary switch of millisecond time-delay tripping; this route protection terminal is by the switching value information of this boundary switch simultaneously, is sent to route protection terminal corresponding to this section other boundary switch except this boundary switch and locality protection terminal corresponding to this section place backbone.When the route protection terminal of this section each boundary switch configuration is all judged to be fault and after tripping operation, the fault point in this section is isolated.Set point is relevant with the line parameter circuit value of power distribution network operational mode and backbone, generally can be set to the rated current of 0.5 times of circuit.
Route protection terminal is sampled to the voltage of each terminal of block switch, electric current in each sampling interval; after being converted to digital sample values; stored in the cache module of memory and queue, digital sample values is sent to route protection terminal and the locality protection terminal of power distribution network the whole network simultaneously.Need to receive the locality protection terminal that belonging to route protection terminal and protected object section that other boundary switch that the route protection terminal of this digital sample values and locality protection terminal are: same protected object section configure, backbone is supporting.
The boundary switch number of each protected object section is likely not identical; the boundary switch number of the attainable participation differential protection of route protection terminal is determined according to the boundary switch number of this section, and capacity is limited to the communication bandwidth of EPON and the disposal ability of route protection terminal.As shown in Figure 1, in the present embodiment, the boundary switch number of section 1 is three, for block switch 1, block switch 2 and block switch 5, the boundary switch number of section 2 is three, for block switch 2, block switch 3 and block switch 6, the boundary switch number of section 3 is two, is block switch 3 and block switch 4.
Locality protection terminal realizes the backup protection of power distribution network backbone and attached branch line thereof: after the of ac information at route protection terminal collection switch place and switching value information are converted to digital signal; and send to locality protection terminal according to IEC61850 standard, locality protection terminal collects power distribution network protected object backbone and the of ac information of attached branch line thereof and the digital signal of switching value information.Grid structure due to power distribution network is all radial pattern or annular (open loop operation), and namely the power supply of each load point only has one.Be that boundary is divided into several sections by power distribution network network by block switch, each section is as a protected object.When there is line fault, having and only having a power supply point to power to fault point.Therefore, in the front and back that fault occurs, the curent change trend that each boundary switch of protected object section detects is: the electric current that the boundary switch of mains side detects increases, and the electric current that the boundary switch of load side detects reduces.In this, as the failure criterion of segment protection.Criterion according to this; locality protection terminal detects the fault signature state of protected object section: detect in each side electric current of certain section on protected circuit and only have side that overcurrent occurs, then the route protection terminal to each boundary switch configuration of this backbone section sends trip signal.After route protection terminal receives the trip signal of locality protection terminal, through confirming to control boundary switch tripping, isolated fault point.
Locality protection terminal receives of ac information and the switching value information of route protection terminal collections all on power distribution network protected object backbone; when route protection terminal differential protection fails action isolated fault; send trip signal to route protection terminal; fault point is isolated, plays the effect of backup protection.Locality protection terminal will backbone be that border is divided into several sections with block switch, receives of ac information and the switching value information of each boundary segmentation switch.Be in the boundary switch of closing position when being under the jurisdiction of all of same section; have boundary switch to be in over-current state, then think that this section exists fault point, the route protection terminal configured respectively to each boundary switch is set out trip signal; the each boundary switch of tripping, realizes the isolation of fault point.The action logic of locality protection terminal is: locality protection terminal detects the electric current of each boundary switch on a backbone, when current value is greater than 1.2 times of rated values, then thinks malfunction, otherwise is non-faulting state.For a section, its boundary switch has two or more, wherein only has one to nonserviceable; and other are all in non-faulting state; then think there is fault in this section, locality protection terminal sends out tripping operation order to the route protection terminal of each boundary switch, completes trip operation by route protection terminal.
Power distribution network area protection system of the present invention; in the step down side outlet of electric power system 110kV transformer station in the power distribution network of the railway superstructures of this part electrical network of user; the circuit connected between Liang Ge transformer station is backbone, and the circuit from backbone to user is branch line.Every bar backbone arranges block switch, and quantity is: 1≤block switch quantity≤3, and backbone is divided into section by block switch, "T"-shaped junction backbone both sides, on branch line, be respectively equipped with block switch.Route protection terminal is connected with in each block switch or box-type substation; the of ac information gathering port of route protection terminal is connected to voltage signal and current signal output end of block switch or box-type substation respectively; the On-off signal port of route protection terminal is connected to the switching signal lead-out terminal of block switch by cable, to obtain switching value information.
Of ac information is voltage, current-mode analog quantity information, is specially: the voltage A phase Ua of block switch, voltage B phase Ub, voltage C phase Uc, electric current A phase Ia, electric current B phase Ib, electric current C phase Ic.Switching value information is remote tripping signal, distant place switching signal, fault message signal, protection starting signal, differential marking signal, current transformer TA disconnection signal, protection exit signal.
In power distribution network; configuring area protection terminal in transformer station or switching station; the of ac that route protection terminal on the backbone at locality protection terminal collection transformer station and switching station place gathers and switching value information; control the route protection terminal on the backbone at transformer station or switching station place, via line protection terminal sends instruction and controls corresponding boundary switch action.
The ethernet communication port of route protection terminal and locality protection terminal is connected to the ethernet communication port of passive optical network unit ONU by ethernet communication line, the passive optical-fiber network PON port of ONU is connected with optical line terminal OLT through multimode fiber.More than one ONU and OLT connects and composes ethernet passive optical network EPON.Like this, each route protection terminal and locality protection terminal form EPON communication connection.
Communication between route protection terminal and locality protection terminal communicates by the regulation of a 9-2 section for IEC61850 standard communication protocol.
As shown in Figure 1, in the present embodiment, transformer station 1 is 110kV transformer station, transformer station 2 is 35kV transformer station, connect the ZW32-12 type vacuum circuit breaker that the block switch 1-block switch 6 that a backbone of transformer station 1 and transformer station 2 is arranged adopts Xi'an Bao Guang circuit breaker Co., Ltd, block switch 1-block switch 6 is configured with route protection terminal 1-route protection terminal 6 respectively, route protection terminal 1-route protection terminal 6 adopts the ISA-353G route protection terminal of CYG Sunrui Co., Ltd., locality protection terminal configuration is in transformer station 1, adopt the ISA-358G locality protection terminal of CYG Sunrui Co., Ltd..Route protection terminal 1-route protection terminal 6 is connected by EPON network with locality protection terminal.
Backbone has 3 sections, is respectively section 1, section 2 and section 3, wherein section 1 and section 2 are that three ends are differential, and section 3 is that two ends are differential.The boundary switch forming section 1 is: boundary switch 1, boundary switch 2 and boundary switch 5, each boundary switch of section 1 is configured with route protection terminal 1, route protection terminal 2 and route protection terminal 5 respectively.The boundary switch forming section 2 is: boundary switch 2, boundary switch 3 and boundary switch 6, each boundary switch of section 2 is configured with route protection terminal 2, route protection terminal 3 and route protection terminal 6 respectively.The boundary switch forming section 3 is: boundary switch 3 and boundary switch 4, each boundary switch of section 3 is configured with route protection terminal 3 and route protection terminal 4 respectively.
Setting area protection terminal is sampling clock source main equipment, as the control source of all route protection terminal sampling clocks.The sampling pulse speed of locality protection terminal is 1200 times/second; namely the sampling interval is 0.833ms; locality protection terminal sends sampling pulse message according to this interval to route protection terminal 1-route protection terminal 6; route protection terminal 1-route protection terminal 6 synchronously receives message, adjusts self clock consistent with the clock of clock source main equipment.
The synchronizing process that route protection terminal adjusts self clock consistent with the clock of clock source main equipment is as follows:
EPON network adopts time-multiplexed method to realize up, downlink data to transmit in same optical fiber, the mutual message of any two nodes can be received by all nodes simultaneously.According to this feature, as shown in Figure 2, the locality protection device being configured to master clock is directly connected with OLT switching center by ONU node synchrone mechanism, realizes the message interaction with other all node (comprising this node).First, master clock sends Sync sync message in the T1 moment, and offside receives this message from clock in the T2 moment (from the clock moment at that time) and writes down now moment T2.Master clock side is when the T3 moment (master clock is the moment at that time) also receives the Sync message sent of oneself (T2 with T3 is consistent in absolute time), send the Follow_up message of in store TD data subsequently to the other side, receive this message from clock and just can carry out following calculating:
Tset is the absolute time needing adjustment from clock.
In same section; the collection of each route protection terminal and mutual of ac information have voltage U a, Ub, Uc and electric current I a, Ib, Ic, gather and mutual switching value information has starting element action, the differential mark in this side, this side TA break, this side is protected and exited.Above information is all sent to the route protection terminal of other each boundary switch configurations of same section by the route protection terminal of each boundary switch configuration.
The of ac information of each route protection terminal and locality protection terminal interaction has voltage U a, Ub, Uc and electric current I a, Ib, Ic, and mutual switching value information has transfer trip, close a floodgate in a distant place.Wherein, of ac information issues locality protection terminal by route protection terminal, and switching value information issues route protection terminal by locality protection terminal.
When circuit AB two-phase phase fault occurs at the F place of section 2, block switch 2 is in open position.The power supply of transformer station 1 can not be powered to fault point F, section 1 normal power supply, and route protection terminal 1, route protection terminal 2, route protection terminal 5 do not experience fault.Transformer station 2 is powered by block switch 4, block switch 3 couples of fault point F, and route protection terminal 3, route protection terminal 4 experience fault current.Route protection terminal 6 is in the load side of fault point, can not experience fault current.
For section 2, route protection terminal 2 no current flows through.Route protection terminal 6 is in the load side of fault point, and its electric current flow through is the load current that fault residual voltage produces the power supply station of load, and its value can be ignored relative to fault current.Route protection terminal 3 flows through fault current.Therefore, the differential current of section 2 is fault current, is more than 1.2 times of circuit rated current, and being greater than differential protection setting value is 0.5 times of rated current, route protection terminal 3 and route protection terminal 6 tripping switch separately.
For section 3, although route protection terminal 4 and route protection terminal 3 all flow through fault current, both fault current phase places are contrary, and fault point F is for section 3 outside district, and therefore the differential protection of section 3 is failure to actuate.
For locality protection terminal, according to above analysis, route protection terminal 1, route protection terminal 2, route protection terminal 5, route protection terminal 6 fault-free information, route protection terminal 3, route protection terminal 4 experience fault message.Action logic according to locality protection terminal: have and only have a boundary switch to experience fault message; locality protection terminal sends out the route protection terminal of tripping operation order to each boundary switch; trip operation is completed by route protection terminal; be specially: section 1 protection is failure to actuate; section 2 protection act, section 3 protection is failure to actuate.
Claims (10)
1. a power distribution network locality protection method, comprises the following steps:
One, install route protection terminal in each block switch on the backbone of power distribution network or box-type substation, backbone is divided into section by block switch, installation region protection terminal in the transformer station or switching station of the backbone of power distribution network;
Two, route protection terminal and locality protection terminal set up communication linkage by communication network; A main equipment is set in route protection terminal and locality protection terminal, as the control source of sampling clock, makes All other routes protect terminal consistent with main equipment with the clock of locality protection terminal;
Three, route protection terminal realizes the differential protection of section backbone: each route protection terminal of this section gathers the analog signal of the voltage and current of respective block switch respectively, after being converted to digital signal, it is sent to the route protection terminal of the boundary switch configuration being in each side of same section, each route protection terminal calculates differential current and the stalling current of this section, when differential current is greater than set point with the ratio of stalling current, this route protection terminal is thought has fault in section, control this boundary switch of tripping, set point is the rated current of 0.5 times of circuit;
Locality protection terminal realizes the backup protection of power distribution network backbone and attached branch line thereof: after the of ac information at route protection terminal collection switch place and switching value information are converted to digital signal, send to locality protection terminal, locality protection terminal calculates the fault characteristic signals of protected object section, detect in each side electric current of certain section on protected circuit and only have side that overcurrent occurs, route protection terminal then to each boundary switch configuration of this backbone section sends trip signal, after route protection terminal receives the trip signal of locality protection terminal, control boundary switch tripping, isolated fault point.
2. power distribution network locality protection method according to claim 1, is characterized in that: the block switch quantity on described backbone is: 1≤block switch quantity≤3.
3. power distribution network locality protection method according to claim 1, is characterized in that: there is "T"-shaped connection branch line in described backbone, "T"-shaped junction backbone both sides, on branch line, be respectively equipped with block switch.
4. power distribution network locality protection method according to claim 1, is characterized in that: described route protection terminal and locality protection terminal set up communication linkage by ethernet passive optical network (EPON).
5. power distribution network locality protection method according to claim 4; it is characterized in that: the ethernet communication port of described route protection terminal and locality protection terminal is linked into the ethernet communication port of passive optical network unit (ONU) by ethernet communication line, passive optical-fiber network (PON) port of passive optical network unit (ONU) is connected to optical line terminal (OLT) by multimode fiber.
6. power distribution network locality protection method according to claim 1, is characterized in that: described of ac information is voltage, current-mode analog quantity information: the voltage A phase of block switch, voltage B phase, voltage C phase, electric current A phase, electric current B phase, electric current C phase; Described switching value information is remote tripping signal, distant place switching signal, fault message signal, protection starting signal, differential marking signal, current transformer circuit supervision fail signal, protection exit signal.
7. power distribution network locality protection method according to claim 1, is characterized in that: described differential current is the phasor sum of each boundary switch electric current of section, and stalling current is the modulus value sum of each boundary switch electric current of section.
8. power distribution network locality protection method according to claim 1, is characterized in that: described route protection terminal is thought has fault in section, controls through being no less than 100 these boundary switch of millisecond time-delay tripping.
9. a power distribution network area protection system, it is characterized in that: described power distribution network area protection system, the backbone of power distribution network arranges block switch, in the backbone both sides of "T"-shaped junction, branch line is respectively equipped with block switch, route protection terminal is connected with in block switch or box-type substation, the of ac information gathering port of route protection terminal is connected to voltage signal and current signal output end of block switch or box-type substation respectively, the On-off signal port of route protection terminal is connected to the switching signal lead-out terminal of block switch by cable, configuring area protection terminal in the transformer station or switching station of the backbone of power distribution network, described route protection terminal and locality protection terminal form network service and are connected, a main equipment is set in route protection terminal and locality protection terminal, main equipment sends sampling synchronization pulse message to other route protection terminal and locality protection terminal, makes the clock of each terminal consistent with main equipment.
10. power distribution network area protection system according to claim 9, is characterized in that: described block switch quantity is: 1≤block switch quantity≤3; Described route protection terminal and locality protection terminal form ethernet passive optical network (EPON) communication connection.
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