CN113991622A - Feeder automation voltage-loss brake-separating delay strategy and setting method - Google Patents
Feeder automation voltage-loss brake-separating delay strategy and setting method Download PDFInfo
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- CN113991622A CN113991622A CN202111268327.3A CN202111268327A CN113991622A CN 113991622 A CN113991622 A CN 113991622A CN 202111268327 A CN202111268327 A CN 202111268327A CN 113991622 A CN113991622 A CN 113991622A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
Abstract
The invention relates to a distribution network automation field terminal technology, in particular to a feeder automation voltage-loss brake-separating delay strategy and a setting method, wherein a W time domain is opened up, the W time domain is divided into 2 constant value W1 time domains and a W2 time domain, whether fault current is sensed before the voltage-loss of a switch is taken as a criterion, the voltage-loss brake-separating delay W1 or W2 is dynamically called, the action times of the non-fault line after the voltage-loss of the switch is reduced, and the time length of the non-fault line for power restoration is shortened; and adding a fixed value option, realizing the acceleration or delay action of the pressure reclosing by setting an acceleration coefficient K1 and a delay coefficient K2, and matching with the no-voltage opening delay for use, so that the setting of the X time is more simplified and unified. For a tree-shaped grid structure, when the switch in the station is used for limiting the power, the voltage-loss brake-separating of the distribution network switch can be effectively avoided. The setting method can accurately isolate the line fault, quickly recover the power supply of the non-fault line and improve the reliability of the power supply.
Description
Technical Field
The invention belongs to the technical field of distribution network automation field terminals, and particularly relates to a feeder automation voltage-loss brake-separating delay strategy and a setting method.
Background
The in-situ feeder automation mainly comprises a voltage time type, a voltage current type and an adaptive synthesis type. The self-adaptive comprehensive feeder terminal realizes the removal of the distribution network fault and ensures the normal power supply of a non-fault area by matching with an interphase fault and ground fault monitoring technology according to the logics of double-side voltage loss switching-off of a distribution network switch, single-side incoming voltage reclosing, switch leading power transmission through which fault current flows and the like. The self-adaptive comprehensive type is the optimal selection in the local control strategy, and has the advantages of low investment, easy implementation and the like in the aspect of economic cost; considering from the aspect of technical factors, the method has the characteristics of independence on a main station, simplicity in setting and the like. But the defects are that the networking time is longer, and the pressure reclosing time of the non-fault distribution network switch is longer than the line fault isolation time.
Disclosure of Invention
Aiming at the problems in the background art, the invention provides a feeder line automatic voltage-loss brake-separating delay strategy and a setting method.
In order to solve the technical problems, the invention adopts the following technical scheme: a feeder automation voltage loss tripping delay strategy and setting method comprises the following steps: the voltage loss and brake separation delay time of each switch is dynamically called by taking whether the distribution network switch senses the fault current as a criterion, so that the power restoration time of a non-fault line is shortened; and a fixed value option is added, the action of pressure reclosing is accelerated or delayed, and the recombination of a power distribution network is completed by matching with the time delay of voltage loss opening.
In the feeder automation voltage loss tripping delay strategy and setting method, an X time domain is defined as delay time of a voltage reclosing, and a Y time domain is time of voltage loss or overcurrent detection opened after the voltage reclosing is successful; defining a W time domain as a time period after voltage loss of two sides of the distribution network switch, and keeping the distribution network switch at a switching-on position in the W time domain; if the time domain exceeds the W time domain, if the distribution network switch continuously keeps a non-pressure state at two sides, the voltage is lost and the brake is switched off; if the voltage state changes in the W time domain, the W time domain is ended in advance, and the switch does not act; splitting the W time domain into 2 fixed value time domains W1 and W2, and dynamically calling W1 and W2 according to whether the switch senses a fault before voltage loss; before the voltage of the two sides of the distribution network switch is lost, the switch sensing the fault current or grounded at the rear end automatically calls the W1 time domain, and the switch not sensing the fault current automatically calls the W2 time domain; the options of accelerating and delaying the reclosing with pressure are as follows: accelerating the pressure reclosure when no fault exists, wherein the acceleration coefficient K1 is more than or equal to 0, and the acceleration coefficient K1 is more than or equal to 0.99; when a fault occurs, the pressure reclosing is delayed, and the delay coefficient K2 is more than or equal to 1.0 and less than or equal to K2 and less than or equal to 2.0; when fault current or zero sequence current is not sensed before voltage loss and one side of the zero sequence current has voltage reclosing, taking K1X as X and K1Y as Y; when fault current or zero sequence current is sensed before voltage loss and one side of the fault current has voltage reclosing, X is K2X, and Y is still Y;
whether the distribution network switch senses the fault current is a judgment basis specifically comprises the following steps: when a line has a fault and causes the tripping of a superior switch, for the switch with voltage loss at two sides, the switch of a loop from a power supply point to a fault point is a switch which senses fault current, and the set of the switches is { DL1 }; other distribution network switches do not sense fault current, and the switch set is { DL2 }; through the setting of W1 time domain, W2 time domain, acceleration coefficient K1 and acceleration coefficient K2 values of the distribution network switch and the selective input acceleration or delay of the pressure reclosing function, a faultless line is not switched off when losing voltage or the faulted part at the rear end of the faulted line is accelerated in the pressure reclosing, and network recombination after faults is completed.
In the above feeder automation no-voltage switching-off delay strategy and setting method, the dynamically invoking the voltage reclosing delay time and no-voltage switching-off time of each switch specifically includes: after the line is in voltage loss, the switch set { DL1} automatically calls a W1 time domain, and whether the voltage reclosing time is delayed or not is determined according to the setting condition of a fixed value; the switch set { DL2} automatically calls W2 time, and whether the action of pressure reclosing is accelerated or not is judged according to the setting condition of the fixed value; the setting method of each switch comprises the following steps:
1) the time domain W1 of all switches is set to be 0S or less than a short delay of the reclosing time of the transformer substation switch, so that the switch can be switched off before the transformer substation is reclosed after the switch which senses the fault is under the voltage loss;
2) time domains of all switches W2 in the tree branch line are infinity, so that the switches of the fault-free branch are not switched off after voltage loss;
3) the single-ring network structure is characterized in that a ring network switch W1 is W2< reclosing time of a substation switch; setting a switch on a tree-type branch line according to the method 1) and the method 2);
4) in the multi-power-point interconnection line, each power-point head switch DLSAccording to W1-W2<Setting the reclosing time of a transformer substation switch; the interconnection line T being connected to other interconnection lines, the first switch DL of the line at the rear end of the connectionTSetting W1 to W2, and starting acceleration or delay a voltage reclosing function at the same time; DLTThen to the tie switch DL of the lineLAll distribution network switches in between, its W2 ═ in-station reclosing time + DLTX time + sigma T contact front end switch X time to ensure DLTAfter the switch is subjected to pressure reclosing and power transmission, the fault-free loop switch is in a closing state; setting W1 of other ring network switches to W2; setting a switch on a tree-type branch line according to the method 1) and the method 2);
5) all distribution network switches in the interconnection line are enabled to have a fault-free acceleration pressure reclosing function;
the tree-type branch line is a network with a tree-shaped topological structure, the line trend flows from the root to each branch and leaf node, and the tree-type branch line comprises branches with root nodes connected to a multi-power-supply ring network; the interconnection line is a line of which the rear end is connected to other power supply points through interconnection switch operation, and the trend of the interconnection line is from left to right and can also be from right to left; the single-ring network structure is a switch without tree-type branch lines; the multi-power-supply-point connecting line is a switch without a tree-shaped branch line.
Compared with the prior art, the invention has the beneficial effects that: the method comprises the steps that the condition that whether fault current is sensed after a distribution network switch is in voltage loss or not is taken as a criterion, the voltage loss opening delay time is dynamically called, so that the voltage loss opening action time of a non-fault line is prolonged, and the power transmission time is shortened by reducing the opening and closing times of the switch when power supply is recovered; the newly added constant value option 'accelerates or delays the action of the press reclosing', is used in cooperation with the time delay of the no-press opening, and enables the setting of the X time of the press reclosing to be simplified and unified. When the tree-shaped grid structure is used for switching and limiting the power in the station, the voltage-loss brake-separating of the distribution network switch is avoided. The setting method can accurately isolate the line fault, quickly recover the power supply of the non-fault line and improve the reliability of the power supply.
Drawings
FIG. 1 is a logic diagram of the voltage-loss switching-off action of a distribution network switch according to the present invention;
FIG. 2 is a logic diagram of the distribution network switch pressure reclosing action of the invention;
fig. 3 is a structure diagram of a net rack of a single-ring mesh belt branch line according to an embodiment of the present invention;
fig. 4 is a structure diagram of a multi-power-point communication network frame according to an embodiment of the present invention;
fig. 5 is a structural diagram of a dual-loop network frame according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
The embodiment provides an automatic voltage-loss tripping delay strategy and setting method for a feeder line, wherein a W time domain is opened up, the W time domain is divided into 2 constant value W1 time domains and a W2 time domain, whether fault current is sensed before voltage loss of a switch is taken as a criterion, voltage-loss tripping delay W1 or W2 is dynamically called, the action frequency of the non-fault line after the voltage loss of the switch is reduced, and the power restoration time of a non-fault line is shortened; and adding a fixed value option, realizing the acceleration or delay action of the pressure reclosing by setting an acceleration coefficient K1 and a delay coefficient K2, and matching with the no-voltage opening delay for use, so that the setting of the X time is more simplified and unified. For a tree-shaped grid structure, when the switch in the station is used for limiting the power, the voltage-loss brake-separating of the distribution network switch can be effectively avoided.
The embodiment is realized by the following technical scheme: defining an X time domain as delay time of the pressure reclosing, and defining a Y time domain as loss voltage detection or overcurrent time of opening after the pressure reclosing is successful; defining a W time domain as a time period after voltage loss of two sides of a distribution network switch, and keeping the switch at a switching-on position in the W time domain; if the time domain exceeds the W time domain, if the switch continuously keeps a non-pressure state at two sides, the switch is switched off in a voltage loss way; if the voltage state changes in the W time domain, the W time domain is ended in advance, and the switch does not act. Splitting a W time domain into 2 fixed values W1 and W2, and dynamically calling W1 and W2 according to whether a switch senses a fault before voltage loss; before the voltage of the two sides of the distribution network switch is lost, the switch which senses the fault current (or the grounding at the back end) automatically calls the time W1, and the switch which does not sense the fault current automatically calls the time W2.
Two options of accelerating and delaying the pressure reclosing are added at the same time:
the fault-free acceleration pressure reclosure has the acceleration coefficient K1, and the K1 is more than or equal to 0 and less than or equal to 0.99;
when the fault delays the pressure reclosure, the delay coefficient K2 is more than or equal to 1.0 and less than or equal to 2.0 and K2;
when fault current (or zero sequence current) is not sensed before voltage loss and one side of the fault current has reclosing, X is K1X, and Y is K1Y.
When fault current (or zero sequence current) is sensed before voltage loss and one side of the fault current has voltage reclosing, X is K2X, and Y is still Y.
The setting method dynamically calls the time delay of the reclosing under pressure and the time delay of the opening of the no-voltage switch according to whether the distribution network switch senses the fault current or not as a judgment basis, and completes the rapid recombination of the distribution network.
Whether the distribution network switch senses the fault current or not is judged according to the following steps: when a line has a fault and causes the tripping of a superior switch, for the switch with voltage loss at two sides, the switch of a loop from a power supply point to a fault point is the switch which senses the fault current, and the set of the switches is { DL1 }; other distribution network switches do not sense the fault current, and the set of the switches is DL 2.
By setting the distribution network switch W1 time domain, W2 time domain, acceleration coefficient K1 and delay coefficient K2 and selectively inputting the functions of accelerating/delaying the pressure reclosing, the faultless line can not be switched off when losing voltage or the faultless part at the rear end of the faulted line can be accelerated, thereby improving the speed of network recombination after the fault.
And the dynamic calling of the time delay of the reclosing under pressure and the time of the opening under pressure comprises the following steps: after the line is in voltage loss, the switch set { DL1} automatically calls a W1 time domain, and whether the voltage reclosing time is delayed or not is determined according to the setting condition of a fixed value; and the switch set { DL2} automatically calls a W2 time domain, and can accelerate the action of the pressure reclosing according to the setting condition of a fixed value. For convenience of the following description, definitions are:
tree branch line: the topology is tree-like, and the line flow flows from the root to the network of each branch and leaf node, including the branch with root node connected to the multi-power ring network.
A communication line: the power supply network is a network in which the rear end can be connected to other power supply points through the operation of a communication switch, and the power flow can be from left to right or from right to left.
The setting principle of each switch is as follows:
method (1): in principle, the W1 time domain of all switches can be set to 0S or a short delay less than the reclosing time of the substation switch to ensure that the switch can be opened before the substation reclosing after the switch sensing the fault is under voltage.
Method (2): all switches in the tree-shaped grid structure, W2 time domain takes infinity, and the switch of the fault-free branch can not be switched off after voltage loss.
Method (3): in a single ring network structure (without a tree branch line switch), a ring network switch W1 is W2< reclosing time of a substation switch. And (3) setting the switch on the tree branch line according to the methods (1) and (2).
Method (4): in the multi-power-supply-point interconnection line (switch without tree branch line), each power-supply-point first switch DLSAccording to W1-W2<Setting the reclosing time of a transformer substation switch; the interconnection line T being connected to other interconnection lines, the first switch DL of the line at the rear end of the connectionTSetting W1 to W2, and the same asThe acceleration/delay pressure reclosing function is started; DLTThen to the tie switch DL of the lineLAll distribution network switches in between, W2 ═ (in-station reclosing time + DL)TX time + Σ T contact front end switch X) of the DL is guaranteedTAfter the switch is subjected to pressure reclosing and power transmission, the fault-free loop switch is in a closing state; and setting W1 of other ring network switches to W2. And (3) setting the switch on the tree branch line according to the methods (1) and (2).
Method (5): all distribution network switches in the interconnection line can start the function of fault-free acceleration pressure reclosing so as to improve the networking speed.
Example (b):
a dynamic setting method for feeder automation voltage-loss switching-off time is disclosed, wherein the logic of the action of voltage-loss switching-off and voltage reclosing of a distribution network switch is respectively shown in attached figures 1 and 2.
As shown in fig. 1, the voltage-loss switching-off operation logic: after voltage loss of the two sides of the distribution network switch, a W time domain is opened, the switch does not act in the time domain, and after the W time domain, if the voltage of the two sides of the switch does not change, the opening action is executed. The time domain sets 2 setting values: w1 and W2, and W1 is not more than W2< X time of the communication switch. The switch DL1 sensing a fault before voltage loss automatically calls W1 for the voltage loss opening time, and the switch DL2 not sensing the fault calls W2. And only one of the values W1 or W2 is called in the W time domain according to whether fault current is sensed or not by any switch.
As shown in fig. 2, the logic of the pressure reclosing action is as follows: and adding a fixed value option, and realizing the acceleration or delay action of the pressure reclosure by setting an acceleration coefficient K1 and a delay coefficient K2. The acceleration coefficient K1 is between 0 and 1, when DL2 is subjected to pressure reclosure at one side, X is K1X, and Y is K1Y. The delay coefficient K2 takes a value of more than 1, when the DL1 has a pressure reclosing on one side, X takes K2X, and Y still takes Y.
When the method is applied to a tree-shaped grid structure, the W2 value is infinity, and the action is not performed after the voltage loss of the { DL2 }.
The method is applied to a single-ring network frame structure, and as shown in fig. 3, the voltage reclosing time of transformer substation outlet switches DLA and DLB is set to be 1S; a1, A2, B1, B2 and D1 are ring network switches, wherein D1 is a tie switch; a3 and A4 are branch switches; each switch has a voltage-time type function. According to the setting principle, the W time domains of the ring switches a1, a2, B1, B2 and D1 are set to (W1 is 0.5, W2 is 0.5), and the W time domains of the branch switches A3 and a4 are (W1 is 0.5, W2 is infinity).
Applied to a multi-power-supply interconnection grid structure, as shown in fig. 4, a transformer substation outlet switch DLA, DLB, DLC are configured with overcurrent protection and voltage reclosing functions, the reclosing time is 1S, a1-a4, B1, B2, C1, C2, D1, D2 are ring network switches, wherein D1 and D2 are interconnection switches, and the X time is 20S; the X time for the other switches is 4S. The Y time is 2S. The distribution network switches have voltage time type and closing quick-break functions, and the lines are segmented into L1-L11 by the switches. As can be seen from FIG. 4, the line T belonging to A3 is connected to the rear end line of A1, and according to claim 2, A2 and A3 are the first switches (DL) of the rear end line of T connection pointT) Adding a setting option of a delay coefficient of a pressure reclosing switch: no fault accelerates coincidence, K1 takes 0.5, then K1X is 2S, K1Y is 1S; when the fault delays and coincides, K2 takes 1.3, K2X is 5.2S, and the Y value is unchanged; a4 as DLTW2 ═ in-station reclosing time + DLTX time + Σ T contact front end switch X), then the W time domain is set to (W1 ═ 0.5S, W2 ═ 9S); the other distribution network switches W are set to (W1 ═ 0.5S, W2 ═ 0.5S), and include first switches (DL 1, B1, C1, and the like) (DLS) (ii) a The W time domain and the time delay setting condition of the reclosing with pressure of each switch of the circuit are shown in the following table 1.
TABLE 1W TIME DOMAIN AND PRESSURE-RESEARCH CLOSING TIME SETTING CONDITIONS OF THE SWITCH IN FIGURE 4
When a permanent fault occurs in the L3, the DLA trips over-current, and the action process is as follows.
(1): voltage loss of the A1-A4 sides is achieved, W time domain timing is started, wherein the A1 and the A2 feel fault current, the W1 time domain is called, the A3 and the A4 do not feel the fault current, and the W2 time domain is called; d1 and D2 start the pressure reclosing timing.
(2): after 0.5S, A1-A3 is subjected to pressure loss and brake opening.
(3): after 1S, DLA pressure reclosing succeeds, and A1 begins pressure reclosing timing.
(4): after 5S, the A1 pressure reclosing is successful, and A2 and A3 start pressure reclosing timing; the A2 senses fault current, delays the time of pressure reclosure and calls K2X; a3 does not sense fault current to accelerate the pressure reclosing time, and K1X is called.
(5): 7S, after the A3 has a pressure reclosing success, a Y time domain (1S) is opened to detect no pressure, A4 stops the voltage loss brake-separating delay timing, and the L7 and the L8 recover power supply; and D2 pressure reclosing timing is stopped.
(6): after 10.2S, A2 is superposed on a fault line L3, the pressure reclosing is locked after the quick-break tripping, and D1 stops the pressure reclosing timing and locks the pressure reclosing.
It can be seen from the above operation process that the acceleration and delay of the pressure reclosure are set at a2 and A3, so that the two switches do not need to be set with different X times, the two switches are prevented from being simultaneously subjected to voltage loss and closing of the pressure reclosure in the traditional mode, the X time setting principle is simplified, and the whole network is uniformly set. Meanwhile, the loss-voltage brake-separating time delay of A4 is matched with the accelerated voltage reclosing time of A3, the rapid power transmission of the non-fault line L8 is ensured by reducing the action times of A4 switch, and the setting time limit of the W2 time domain is standardized, namely the voltage reclosing time of a transformer substation is added with the X time of A1 and A3.
According to the method (5), the looped network switches A1-A4, B1, B2, C1 and C2 are all added with a fault-free acceleration pressure reclosing. When a permanent fault occurs in the L6, the DLC is over-current tripped, and the switching action process is as follows.
The method comprises the following steps: c1 and C2 start the voltage loss switching-off timing, and D1 starts the voltage reclosing timing.
Secondly, the step of: after 0.5S, C1 and C2 lose voltage and are switched off.
③: after 1S, the DLC reclosing trips again after the fault, and C1 locks the reclosing.
Fourthly, the method comprises the following steps: after 20S, D1 pressure reclosing, C2 started pressure reclosing timing, and call K1 × X (2S).
Fifthly: 22S later, C2 has pressure reclosing.
As can be seen from the above operation process, the ring network switch C2 calls the accelerated reclosing through no fault, so that the L5 line is powered on 2S ahead of time.
Applied to a double-ring network grid structure, as shown in fig. 5, DLA and DLB are substation outlet switches, reclosing time is 1S, a1-a4, B1-B4, D1 and D2 are ring network switches, wherein D1 and D2 are interconnection switches; the X time is 4S. AI, A2, B1, B2 are used as the first switch (DL) of the back-end circuit of the T-junctionT) W1 ═ W2<1S, adding a setting option of a delay coefficient of a voltage reclosing switch; the communication switches D1 and D2 are taken as demarcation points, A3, a4, B3 and B4 are taken as head switch rear-end distribution network switches, and W2 is equal to (in-station reclosing time + DL)TX time + Σ T contact front end switch X). The time domain of each switch W of the circuit and the delay setting condition of the pressure reclosing are shown in the following table 2.
TABLE 2W TIME DOMAIN AND PRESSURE-RESEARCH TIME DELAY SETTING OF THE SWITCH IN THE DRAWING 5
In the present specification, each implementation case is described in a progressive manner, each implementation case is mainly described as different from other implementation cases, and the same and similar parts among the implementation cases are referred to each other. For the description of the implementation case disclosure, since it corresponds to the method of the implementation case disclosure, the description is simple, and the relevant points can be referred to the method section.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (3)
1. A feeder automation voltage loss tripping delay strategy and a setting method are characterized in that: the method comprises the following steps: the voltage loss and brake separation delay time of each switch is dynamically called by taking whether the distribution network switch senses the fault current as a criterion, so that the power restoration time of a non-fault line is shortened; and a fixed value option is added, the action of pressure reclosing is accelerated or delayed, and the recombination of a power distribution network is completed by matching with the time delay of voltage loss opening.
2. The feeder automation voltage-loss tripping delay strategy and setting method according to claim 1, characterized in that: whether the distribution network switch senses the fault current is a judgment basis specifically comprises the following steps: defining an X time domain as delay time of the pressure reclosing, and defining a Y time domain as loss voltage detection or overcurrent time of opening after the pressure reclosing is successful; defining a W time domain as a time period after voltage loss of two sides of the distribution network switch, and keeping the distribution network switch at a switching-on position in the W time domain; if the time domain exceeds the W time domain, if the distribution network switch continuously keeps a non-pressure state at two sides, the voltage is lost and the brake is switched off; if the voltage state changes in the W time domain, the W time domain is ended in advance, and the switch does not act; splitting the W time domain into 2 fixed value time domains W1 and W2, and dynamically calling W1 and W2 according to whether the switch senses a fault before voltage loss; before the voltage of the two sides of the distribution network switch is lost, the switch sensing the fault current or grounded at the rear end automatically calls the W1 time domain, and the switch not sensing the fault current automatically calls the W2 time domain; the options of accelerating and delaying the reclosing with pressure are as follows: accelerating the pressure reclosure when no fault exists, wherein the acceleration coefficient K1 is more than or equal to 0, and the acceleration coefficient K1 is more than or equal to 0.99; when a fault occurs, the pressure reclosing is delayed, and the delay coefficient K2 is more than or equal to 1.0 and less than or equal to K2 and less than or equal to 2.0; when fault current or zero sequence current is not sensed before voltage loss and one side of the zero sequence current has voltage reclosing, taking K1X as X and K1Y as Y; when fault current or zero sequence current is sensed before voltage loss and one side of the fault current has voltage reclosing, X is K2X, and Y is still Y;
when a line has a fault and causes the tripping of a superior switch, for the switch with voltage loss at two sides, the switch of a loop from a power supply point to a fault point is a switch which senses fault current, and the set of the switches is { DL1 }; other distribution network switches do not sense fault current, and the switch set is { DL2 }; through the setting of W1 time domain, W2 time domain, acceleration coefficient K1 and acceleration coefficient K2 values of the distribution network switch and the selective input acceleration or delay of the pressure reclosing function, a faultless line is not switched off when losing voltage or the faulted part at the rear end of the faulted line is accelerated in the pressure reclosing, and network recombination after faults is completed.
3. The feeder automation voltage-loss tripping delay strategy and setting method according to claim 2, characterized in that: the dynamic calling of the voltage reclosing delay time and the voltage loss opening time of each switch specifically comprises the following steps: after the line is in voltage loss, the switch set { DL1} automatically calls a W1 time domain, and whether the voltage reclosing time is delayed or not is determined according to the setting condition of a fixed value; the switch set { DL2} automatically calls W2 time, and whether the action of pressure reclosing is accelerated or not is judged according to the setting condition of the fixed value; the setting method of each switch comprises the following steps:
1) the time domain W1 of all switches is set to be 0S or less than a short delay of the reclosing time of the transformer substation switch, so that the switch can be switched off before the transformer substation is reclosed after the switch which senses the fault is under the voltage loss;
2) time domains of all switches W2 in the tree branch line are infinity, so that the switches of the fault-free branch are not switched off after voltage loss;
3) the single-ring network structure is characterized in that a ring network switch W1 is W2< reclosing time of a substation switch; setting a switch on a tree-type branch line according to the method 1) and the method 2);
4) in the multi-power-point interconnection line, each power-point head switch DLSAccording to W1-W2<Setting the reclosing time of a transformer substation switch; the interconnection line T being connected to other interconnection lines, the first switch DL of the line at the rear end of the connectionTSetting W1 to W2, and starting acceleration or delay a voltage reclosing function at the same time; DLTThen to the tie switch DL of the lineLAll distribution network switches in between, its W2 ═ in-station reclosing time + DLTX time + sigma T contact front end switch X time to ensure DLTAfter the switch is subjected to pressure reclosing and power transmission, the fault-free loop switch is in a closing state; setting W1 of other ring network switches to W2; setting a switch on a tree-type branch line according to the method 1) and the method 2);
5) all distribution network switches in the interconnection line are enabled to have a fault-free acceleration pressure reclosing function;
the tree-type branch line is a network with a tree-shaped topological structure, the line trend flows from the root to each branch and leaf node, and the tree-type branch line comprises branches with root nodes connected to a multi-power-supply ring network; the interconnection line is a line of which the rear end is connected to other power supply points through interconnection switch operation, and the trend of the interconnection line is from left to right and can also be from right to left; the single-ring network structure is a switch without tree-type branch lines; the multi-power-supply-point connecting line is a switch without a tree-shaped branch line.
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