CN112054493A - Distribution line on-site feeder automation functional modeling commissioning method - Google Patents
Distribution line on-site feeder automation functional modeling commissioning method Download PDFInfo
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- CN112054493A CN112054493A CN202010970770.4A CN202010970770A CN112054493A CN 112054493 A CN112054493 A CN 112054493A CN 202010970770 A CN202010970770 A CN 202010970770A CN 112054493 A CN112054493 A CN 112054493A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The method comprises the steps of carrying out terminal automation function testing, formulating an automation and protection configuration scheme according to the characteristics of a line, carrying out software updating and parameter setting on the terminal on site, and observing the operation condition. The commissioning method can provide standardized and stylized steps for the distribution line on-site feeder automation commissioning, provides scientific basis for the setting of the switch position, improves the effectiveness and the reasonableness of the setting, and can provide scientific basis for the planning and designing department to carry out line planning and design, the operation and maintenance department to carry out line transformation work and the like.
Description
Technical Field
The invention relates to a distribution line on-site type feeder automation function model operation method, and belongs to the technical field of distribution line feeder automation.
Background
With the development of economic society, power users have higher power supply reliability requirements on power supply reliable power systems, and the power supply reliability is deeply influenced by the fault processing efficiency. The local feeder line is automatically switched on and off through the voltage time type terminal control switch, so that automatic fault isolation and automatic recovery of a non-fault area can be realized.
According to the line structure, the on-site feeder automation line can be divided into a single radiation line and a connection line, the on-site feeder automation line is divided into a plurality of sections by an initial switch and a plurality of voltage time section switches, and the action principle can be summarized into two reclosures of the initial switch matched with the section switches to be switched on and off, the first reclosing, and the switches at two sides of a locking fault point to isolate faults; and (5) carrying out secondary superposition and recovering the power supply of the non-fault area at the power supply side. Specifically, when a fault occurs, an initial end switch trips, a full-line voltage time type switch loses voltage and is switched off, the initial end switch recloses for the first time, all the voltage time type switches are powered on and switched on one by one until the switch is switched on to the fault, the initial end switch trips again, meanwhile, the voltage time type switches before and after the fault point are locked through overcurrent and residual voltage, and the switch is not switched on again after the next power is obtained; and (4) reclosing the initial end switch for the second time, enabling the section switches to be electrified and closed one by one to recover power supply, and closing the section switches according to a set time sequence by the contact switches to recover a non-fault area behind a fault point if an interconnection line exists.
Advantages of in-situ feeder automation include: 1) the switch has the functions of remote measurement and remote signaling; 2) the voltage type switch has the characteristics of 'delayed closing of incoming call and release without voltage', and the action is reliable; 3) the outgoing switch is superposed twice to complete fault positioning and isolation; 4) when the first section of the circuit fails, the outgoing switches can always be successfully superposed.
However, in the actual application process, the in-place feeder automation is troubled by the problems of various manufacturers, various versions of terminal control software, inconsistent automation logic, difficult coordination of protection and automation, non-uniform field operation and maintenance means and the like, and the application level of automation is influenced. Meanwhile, the in-situ feeder automation has the following weaknesses: 1) the 'delay-close' X time limit of all switches needs to be configured, and two switches cannot be closed at the same time; 2) the delay parameter configuration of the relevant switch needs to be adjusted simultaneously when the operation mode is adjusted. 3) When the power supply side switch at the fault point is failed to be locked, the outgoing line switch is repeatedly superposed to the fault; 4) when the residual voltage of the load side switch at the fault point is locked and fails, the contact switch is closed to the fault point (when the two-phase short circuit fault of the voltage of the collected line occurs); 5) when the PT on one side of the tie switch is disconnected, if the terminal is not identified, the tie switch is automatically closed.
Disclosure of Invention
The invention aims to realize the mode operation of an automatic line and improve the operation efficiency of the local feeder automation function of a distribution line.
The technical scheme for realizing the invention is that the method for automatically and functionally operating the local feeder of the distribution line is characterized in that the method comprises the steps of developing an automatic function test of a terminal, formulating an automation and protection configuration scheme according to the characteristics of the line, carrying out software updating and parameter setting on the terminal on site, and observing the operation condition.
The development of the terminal automation function test is to uniformly test the automation functions of all manufacturers so as to determine the automatic software version of each manufacturer, which can be operated on site; the functional verification comprises: terminal voltage loss (including short delay) tripping logic, incoming call delay closing, fault locking logic, interconnection switch locking and power transmission logic and terminal debugging mode logic; in the test process, at least 4 intelligent terminals are required to carry out combined debugging, and the debugging content comprises contact mode testing and single radiation mode testing.
The interconnection mode comprises a starting switch CB and a connecting switch LL, the rest switches are section switches D01, D02 and the like, and the debugging should simulate the faults of at least three regions, namely the faults of three regions between the starting switch CB and the section switch D01, between the section switch D01 and the section switch D02 and between the section switch D02 and the connecting switch LL.
The single radiation mode comprises a starting switch CB and a connecting switch LL, the rest switches are section switches D01 and D02, and the like, and faults of at least four areas are simulated, namely, faults of four areas, namely, an area surrounded by three switches, namely section switches D01, D02 and D03, a rear area of a section switch D02 and a rear area of a section switch D03, between the starting switch CB and the section switch D01.
The planning automation and protection configuration scheme includes a single radiating line and a tie line.
In the process of making the scheme, the following principles are followed: 1) the on-site feeder automation function is fully exerted, and the power failure range is reduced as much as possible; 2) the automation and the protection are combined, so that the tripping times are reduced as much as possible, and the electricity consumption feeling of a user is improved; 3) the scheme is matched with the characteristics of the circuit, and the position of the switch is not moved as much as possible.
(1) Single radiating line automation and protection configuration scheme
The circuit comprises 3 large branches, and 6 automatic switches D01, F01, F02, F03, F04 and F09 are arranged in total, wherein D01 and F01 are located on a main line, the other 4 switches are located on three branch lines, and F02 and F03 switches are located on the same branch line; the configuration protection automation scheme is as follows:
1) the outgoing line switch is protected, and the overcurrent I section is 2100A/0 s; the overflowing II section is 1200A/0.2 s; the overcurrent III section 330A/0.5 s;
2) the D01 switch does not switch protection, and switches an automatic function, wherein X time limit is 21s, Y time limit is 5s, and zero sequence protection alarms are 3A/20 s;
3) f02 switch protection is not switched, automatic function is switched, X time limit is 14s, Y time limit is 5s, and zero sequence protection alarm is 3A/18 s;
4) four switches such as F03, F01, F04 and F09 are all protected and automated, an overcurrent I section is matched with an outlet switch overcurrent II section, and the overcurrent II section is matched with an outlet switch overcurrent III section;
(2) interconnection line automation and protection configuration scheme
The line is a hand-in-hand communication line, the line is communicated with the other 10kV line on the opposite side, 1 large branch is included, and 3 automatic switches D01, D02 and a communication switch L30 are arranged in total; the switch settings are as follows:
1) the outgoing switch is protected, and the overcurrent I section exits; the over-current II section is 1500A/0.2 s; the overcurrent III section 330A/0.4 s;
2) d01 switch protection, overcurrent I section 1200A/0 s; 300A/0.2s of overcurrent II section and 3A/18s of zero sequence protection alarm; (ii) a
3) The D02 switch does not switch protection, and switches an automatic function, wherein X time limit is 7s, Y time limit is 5s, and zero sequence protection alarm is 3A/20 s;
4) tie switch L30 switches to tie switch automation mode, X time limit 21s, Y time limit 5 s.
The method for updating the software and setting the parameters of the terminal comprises the following steps: firstly, updating software of terminals with corresponding models according to software versions passing the test, wherein the software updating comprises checking with a point table of a main station; setting a protection fixed value and automation parameter information according to a protection automation configuration scheme; and under the condition that the condition allows, setting a related fault sequence on the basis, testing the terminal by using the single body, and after the test is successful, putting the terminal into automatic operation, wherein the automatic function is formally started.
After the automatic function is put into operation, the operation condition is observed by checking the remote signaling and remote measuring information of the terminal and the master station in time, and tracking and observing the operation condition; particularly, after a fault occurs, whether the fault point is consistent with an automatic positioning result or not is checked, and whether protection and automation actions are correct or not is judged; if an abnormal condition occurs, the problem is searched, and adjustment and optimization are carried out according to the condition.
The technical solution of the in-place feeder automation is as follows,
when a fault occurs, firstly tripping is carried out by an outgoing line switch with protection, the whole line has power failure, voltage time type switches arranged on a line detect voltage loss tripping, the outgoing line switch recloses, power supply is restored step by the voltage time type switches until the voltage time type switches are switched off again when the fault occurs, the voltage time type switch controller FTU closes through a residual voltage locking switch, and the fault is not positioned when the next incoming call is received, so that the function of positioning the fault by the first reclosing is completed; and after the fault trips for the second time, delaying the closing for the second time and gradually recovering the non-fault area.
The method has the advantages that the method realizes the automatic line mode operation according to the steps of developing the terminal automatic function test, formulating the automatic and protection configuration scheme according to the line characteristics, carrying out software updating and parameter setting on the line on site, observing the operation condition and the like, improves the operation efficiency of the distribution line local feeder automatic function, and improves the operation reliability. The method provided by the invention can provide standardization and stylization steps for the distribution line local feeder automation operation, provides scientific basis for the setting of the switch position, improves the effectiveness and the rationality of the setting, and provides scientific basis for the planning and designing department to carry out line planning and design, and the operation and maintenance department to carry out line transformation work and the like.
Drawings
Fig. 1 is a schematic diagram illustrating a commissioning procedure of a distribution automation terminal according to the present invention;
fig. 2 is a schematic diagram of a fault point between a tie line start switch and a sectionalizer;
fig. 3 is a schematic diagram of a fault point between two section switches of a tie line;
fig. 4 is a schematic diagram of a fault point between a tie line sectionalizer and a tie switch;
FIG. 5 is a schematic diagram of a fault point between a single radiating line start switch and a sectionalizer;
FIG. 6 is a schematic diagram of a fault point between a single radiating line and a plurality of section switches;
fig. 7 is a schematic diagram of a fault point at the rear side to the end region of a single radiating line section switch;
fig. 8 is a schematic diagram of a fault point in the rear side area of a single radiating line section switch;
FIG. 9 is a schematic diagram of physical simulation platform wiring;
FIG. 10 is a schematic diagram of an automated tester cluster test method;
FIG. 11 illustrates a version number of a local type automation program for a type of terminal;
FIG. 12 is a schematic diagram of a single radiating line structure;
FIG. 13 is a diagram of a 10kV single-line in-situ feeder automation and protection configuration;
fig. 14 is a diagram of a 10kV tie line in-situ feeder automation and protection configuration;
fig. 15 is a schematic diagram of an in-situ feeder automation operation of a single radiating line;
fig. 16 is a schematic diagram of in-situ feeder automation of a manual distribution line.
Detailed Description
As shown in fig. 1, the method for operating a distribution line in-situ feeder automation function model according to the embodiment includes the following steps: 1) carrying out terminal automation function test; 2) an automation and protection configuration scheme is formulated according to the line characteristics; 3) carrying out software updating and parameter setting on the terminal on site; 4) and observing the running condition and the like.
Step 1, developing terminal automation function tests:
because there are many distribution automation equipment manufacturers, and according to incomplete statistics, distribution automation equipment manufacturers supplied nationwide exceed 400, at present, no national standard exists for on-site feeder automation products, and the equipment appearance, structure, function setting and automation logic of each manufacturer are different, so that before the automation of on-site commissioning, the automation functions of all manufacturers must be tested in a unified manner to determine the on-site-operable automation software versions of the manufacturers. Wherein the functional verification comprises: terminal voltage loss (including short delay) tripping logic, incoming call delay closing, fault locking logic, interconnection switch locking and power transmission logic, terminal debugging mode logic and the like.
In the testing process, at least 4 intelligent terminals are required to carry out combined debugging, and the debugging content comprises two situations of contact mode testing and single radiation mode testing.
(1) Contact mode
The interconnection mode comprises a start switch CB and a connection switch LL, the rest switches are section switches D01, D02 and the like, the debugging should simulate the faults of at least three areas, namely the faults of three areas between the start switch CB and the section switch D01, between the section switch D01 and the section switch D02 and between the section switch D02 and the connection switch LL.
Failure section 01: the fault is located between the start switch CB and the section switch D01 as shown in fig. 2.
The action conditions of the switches are as follows: tripping a switch CB at the initial end, immediately losing power of the switch D01 and the switch D02, separating the brake after the power loss is delayed for delta t, and keeping the original brake separating state of a switch LL; secondly, the switch CB at the initial end is reclosed for the first time, if the fault is a transient fault, the reclosing is successful, the switch D01 and the switch D02 are electrified sequentially and respectively subjected to respective electrification delay time limit delta tD01、ΔtD02Time limit switching-on, and automatic power supply recovery due to line fault; if the fault is a permanent fault, the reclosing fault still exists, the switch CB at the initial end trips for the second time, and meanwhile, the switch D01 receives a residual voltage signal and is automatically locked immediately; thirdly, the relay switch LL is delayed by time limit delta t after getting electricityLLTime-limited switching-on from the opposite side lineThe power supply is recovered, the power supply of a line between the interconnection switch LL and the section switch D02 is recovered, and after the section switch D02 is powered on, the power on time delay delta t is passedD02The power supply of the line between the section switch D02 and the section switch D02 is restored in a time limit. This concludes the in-situ feeder automation process.
Fault section 02: the fault is located between section switch D01 and section switch D02 as shown in fig. 3.
The action conditions of the switches are as follows: tripping a switch CB at the initial end, immediately losing power of the switch D01 and the switch D02, separating the brake after the power loss is delayed for delta t, and keeping the original brake separating state of a switch LL; secondly, the switch CB at the initial end is reclosed for the first time, the reclosing is successful, and the switch D01 is electrified and then subjected to the electrification delay time limit delta tD01Closing the switch, if the fault is a transient fault, obtaining the power by the D02 and delaying the time limit delta tD02Time limit switching-on, and automatic power supply recovery due to line fault; if the fault is a permanent fault, the fault still exists after the D01 is electrified and switched on, the switch CB at the starting end trips for the second time, and meanwhile, the switch D01 and the switch D02 receive residual voltage signals and are immediately and automatically locked; the starting end switch CB is reclosed for the second time, and the line power supply between the starting end switch CB and the section switch D01 is recovered; delay time limit delta t for connecting switch LL to get electricityLLAnd (4) time limit closing, namely, recovering the power supply of the line between the interconnection switch LL and the section switch D02 from the power supply of the opposite line. And the section switch D01 and the section switch D02 are locked, and the fault is positioned between the two switches, so that the local feeder automation action process is finished.
The failure section 03: the fault is located between section switch D02 and tie switch LL as shown in fig. 4.
The action conditions of the switches are as follows: firstly, tripping a switch CB at the initial end, immediately losing power of a section switch D01 and a switch D02, separating brake by a delay time delta t after losing power, and keeping the original brake separating state because a switch LL does not act; secondly, the switch CB at the initial end is reclosed for the first time, the reclosing is successful, and the switch D01 is electrified and then subjected to the electrification delay time limit delta tD01Closing the switch, and obtaining the power after the switch D02 is powered on and delaying the power time limit delta tD02Switching on, if the fault is a transient fault, automatically recovering power supply due to the line fault; if the fault is a permanent fault,the reclosing fault still exists, the switch CB at the initial end trips for the second time, and meanwhile, the switch D02 and the switch LL receive residual voltage signals and are automatically locked immediately; thirdly, the initial switch CB is reclosed for the second time, the line power supply between the initial switch CB and the section switch D01 is recovered, and after the switch D01 is powered on, the power-on delay time limit delta t is passedD01Closing the switch, and obtaining the power after the switch D02 is powered on and delaying the power time limit delta tD02And switching on, and the non-fault area recovers power supply. The section switch D02 and the interconnection switch LL are locked, the fault is positioned between the two switches, and the automatic action process of the in-situ feeder is ended.
The opening delay time delta t is used for avoiding voltage sag caused in the power grid fault processing process, fluctuation caused in the power grid operation process and the like; in some embodiments, the delay time Δ t satisfies: delta t is more than or equal to 0.3s and less than or equal to 1 s. In some embodiments, the delay time Δ t satisfies: delta t is more than or equal to 0.3s and less than or equal to 0.5 s. In some embodiments, the delay time Δ t satisfies: Δ t is 0.5 s.
(2) Single radiation mode
The single radiation mode comprises a starting switch CB and a connecting switch LL, the rest switches are section switches D01, D02 and the like, and the debugging should simulate the faults of at least four areas, namely, the faults of four areas, namely, an area surrounded by three switches, namely, a starting switch CB and a section switch D01, a section switch D01, a section switch D02 and a section switch D03, a rear area of a section switch D02 and a rear area of a section switch D03.
Failure section 01: the fault is located between the start switch CB and the section switch D01 as shown in fig. 5.
The action conditions of the switches are as follows: tripping a switch CB at the initial end, immediately losing power of the section switches D01, D02 and D03, and separating the brake by a delay time delta t after the power is lost; secondly, the switch CB at the initial end is reclosed for the first time, if the fault is a transient fault, the reclosing is successful, the switch D01, the switch D02 and the switch D03 are electrified in sequence and respectively subjected to respective electrification delay time limit delta tD01、ΔtD02、ΔtD03Time limit switching-on, and automatic power supply recovery due to line fault; if the fault is a permanent fault, the reclosing fault still exists, the switch CB trips for the second time, and meanwhile the switch D01 receives a residual voltage signal and is automatically locked immediately.The fault point is positioned between the start switch CB and the section switch D01, and the in-place feeder automation action process is finished.
Fault section 02: the fault is located in the area surrounded by three switches D01, D02 and D03, as shown in FIG. 6.
The action conditions of the switches are as follows: tripping a switch CB at the initial end, immediately losing power of the section switches D01, D02 and D03, and separating the brake by a delay time delta t after the power is lost; secondly, the switch CB at the initial end is reclosed for the first time, the reclosing is successful, and the switch D01 is electrified and then subjected to the electrification delay time limit delta tD01Closing the switch, if the fault is a transient fault, obtaining the power by the D02 and delaying the time limit delta tD02Time limit closing, D03 power-on and power-on delay time limit delta tD03Time limit switching-on, and automatic power supply recovery due to line fault; if the fault is a permanent fault, the fault still exists after the D01 is electrified and switched on, the switch CB at the starting end trips for the second time, meanwhile, the switch D01 receives a residual voltage overcurrent signal, the D02 and the D03 receive residual voltage signals, and the three switches are immediately and automatically locked; and thirdly, reclosing the starting end switch CB for the second time to recover the line power supply between the starting end switch CB and the section switch D01. The fault is located in the area between the rear side of the section switch D01 and the D02, D03 switches, so far the in-place feeder automation process is finished.
The failure section 03: the fault is located in the rear area of the section switch D02 as shown in fig. 7.
The action conditions of the switches are as follows: tripping a switch CB at the initial end, immediately losing power of the section switches D01, D02 and D03, and separating the brake by a delay time delta t after the power is lost; secondly, the switch CB at the initial end is reclosed for the first time, the reclosing is successful, and the switch D01 is electrified and then subjected to the electrification delay time limit delta tD01Closing the switch, if the fault is a transient fault, obtaining the power by the D02 and delaying the time limit delta tD02Time limit switching-on, then D03 is electrified and delayed by time limit delta tD03Time limit switching-on, and automatic power supply recovery due to line fault; if the fault is a permanent fault, the fault still exists after the D02 is powered on and switched on, the switch CB at the starting end trips for the second time, and meanwhile, the switch D02 receives a residual voltage overcurrent signal and automatically locks immediately; thirdly, the starting end switch CB is reclosed for the second time, the line power supply between the starting end switch CB and the section switch D01 is recovered, and then D03 power-on and power-off delay time limit delta tD03And (4) time limit switching-on and power supply recovery in a non-fault area. The fault is located in the area between the rear sides of section switch D02, so far the in-place feeder automation action process is finished.
A fault section 04: the fault is located in the rear area of the section switch D03 as shown in fig. 8.
The action conditions of the switches are as follows: tripping a switch CB at the initial end, immediately losing power of the section switches D01, D02 and D03, and separating the brake by a delay time delta t after the power is lost; secondly, the switch CB at the initial end is reclosed for the first time, the reclosing is successful, and the switch D01 is electrified and then subjected to the electrification delay time limit delta tD01Closing, D02 getting electricity and getting electricity delay time limit delta tD02Time limit switch-on, if the fault is instantaneous, D03 is electrified to pass through the time delay delta tD03Time limit switching-on, and automatic power supply recovery due to line fault; if the fault is a permanent fault, the fault still exists after the D03 is powered on and switched on, the switch CB at the starting end trips for the second time, and meanwhile, the switch D03 receives a residual voltage overcurrent signal and automatically locks immediately; thirdly, the starting switch CB is reclosed for the second time, the line power supply between the starting switch CB and the section switch D01 is recovered, and then the D02 is electrified to obtain the power and obtain the power delay time limit delta tD02And (4) time limit switching-on and power supply recovery in a non-fault area. The fault is located in the area between the rear sides of section switch D03, so far the in-place feeder automation action process is finished.
The opening delay time delta t is used for avoiding voltage sag caused in the power grid fault processing process, fluctuation caused in the power grid operation process and the like. In some embodiments, the delay time Δ t satisfies: delta t is more than or equal to 0.3s and less than or equal to 1 s. In some embodiments, the delay time Δ t satisfies: delta t is more than or equal to 0.3s and less than or equal to 0.5 s. In some embodiments, the delay time Δ t satisfies: Δ t is 0.5 s.
(3) Terminal test embodiments
In some embodiments, a physical simulation platform test method is used to carry out terminal automated function tests, the physical simulation platform constructs a distribution line simulation system, as shown in fig. 9, in the figure, E is a power supply, L1, L2, and L3 are three lines for supplying power to the power supply E, a start switch of a K1 simulation line L2, a section switch of a K2, and a K3 simulation line L2, and a tie switch of a K4 simulation line L2 and a line L1, and each switch controls a switching-on/off switch by a terminal of a model to be tested. During the test, by simulating a fault between the K1 and K2 switches; a fault between the K2 switch and the K3 switch; a fault between the K3 switch and the K4 switch (tie switch). And in the testing process, if a function error is found, a software problem is found, and field modification and adjustment are carried out in time.
In some embodiments, a multiple automated functional tester combined test method is employed. The automatic tester can output three-phase current and three-phase voltage signals which can be changed randomly, and simultaneously, the automatic tester comprises a simulation circuit breaker and can simulate a switch controlled by a terminal. The joint test method requires at least four automatic testers and four terminals, and wiring is required between the automatic testers and the four terminals, wherein the wiring includes data lines such as current, voltage, signals and the like, as shown in fig. 10. The terminal 01 and the analog circuit breaker serve as a starting switch, the terminals 02 and 03 and the analog circuit breaker serve as two section switches, and the terminal 04 and the analog circuit breaker serve as a tie switch; each terminal tester respectively formulates 5 sets of current and voltage and simulation circuit breaker state output sequences, 5 different types of faults such as a normal state, faults among terminals and interconnection switch opposite side faults are simulated respectively, and each set of sequence simulates the current and voltage and switch position change conditions when the faults occur according to on-site type feeder automation logic.
Before testing, each automated tester needs to set a plurality of sets of voltage and current output schemes, each set of scheme corresponds to a fault occurrence section, and in the testing process, the terminal control switch action condition of each switch is observed; if the action condition is consistent with the in-situ type automation action logic, the terminal software is correct, otherwise, technicians are required to adjust the terminal software on site, and finally, all correct software versions of the action are determined.
Fig. 11 shows an automated software version of a model intelligent terminal.
Step 2, establishing an automation and protection configuration scheme:
before the on-site feeder automation operation, a protection configuration scheme and an automation scheme are determined according to the line structure and the switch distribution characteristics, and the following principles are followed in the scheme preparation process: 1) the on-site feeder automation function is fully exerted, and the power failure range is reduced as much as possible; 2) the automation and the protection are combined, so that the tripping times are reduced as much as possible, and the electricity consumption feeling of a user is improved; 3) the scheme is matched with the characteristics of the circuit, and the position of the switch is not moved as much as possible.
(1) Single radiation circuit configuration scheme
A certain line is a single radiation line, the line comprises 3 large branches, and 6 automatic switches D01, F01, F02, F03, F04 and F09 are arranged in total, wherein D01 and F01 are located on a main line, the other 4 switches are located on three branch lines, and F02 and F03 switches are located on the same branch line. Fig. 12 is a schematic circuit diagram.
Through calculation and analysis, the four switches such as the switches F01, F03, F04 and F09 are found to be at approximately the same positions, and the positions are located within the effective range of the hierarchical protection configuration, so that the four switches are protected, the faults after the four switches can be directly isolated by the action of the four switches, the power failure range of the faults is reduced, and the action frequency of a front-end switch is also reduced. And the D01 and F02 switch setting automation logic can ensure that when the two switches and the part between the four switches for setting protection are in failure, the power supply of the upstream non-failure area is not interrupted.
Along these lines, the deployment protection automation scheme is as follows, as shown in FIG. 13.
1) The outgoing line switch is protected, and the overcurrent I section is 2100A/0 s; the overflowing II section is 1200A/0.2 s; the overcurrent III section 330A/0.5 s;
2) the D01 switch does not switch protection, and switches an automatic function, wherein X time limit is 21s, Y time limit is 5s, and zero sequence protection alarms are 3A/20 s;
3) f02 switch protection is not switched, automatic function is switched, X time limit is 14s, Y time limit is 5s, and zero sequence protection alarm is 3A/18 s;
4) four switches such as F03, F01, F04, F09 are all switched to be protected and automated, an overcurrent I section is matched with an outlet switch overcurrent II section, and the overcurrent II section is matched with an outlet switch overcurrent III section.
(2) Arrangement scheme of communication line
The line is a hand-in-hand interconnection line, is in interconnection with another 10kV line on the opposite side, comprises 1 large branch, and is provided with 3 automatic switches D01, D02 and an interconnection switch L30. Because the D01 switch is arranged at a short distance of the line outgoing switch, in order to make full use of each switch, when a scheme is formulated, the D01 is provided with protection and twice reclosing, the outgoing switch is also provided with protection, and because the distance between the D01 switch and the outgoing switch is too close, the classified protection can not be realized through current, so that the fast-break protection of the 913 switch in the station is withdrawn, incomplete matching with the D01 is realized by means of time level difference, the other two switches D02 and L30 are respectively put into operation of automatic logic, and fault isolation and automatic power restoration are realized through in-situ voltage time type action logic.
The switch configuration protection automation scheme is as follows, as shown in fig. 14.
1) The outgoing switch is protected, and the overcurrent I section exits; the over-current II section is 1500A/0.2 s; the overcurrent III section 330A/0.4 s;
2) d01 switch protection, overcurrent I section 1200A/0 s; 300A/0.2s of overcurrent II section and 3A/18s of zero sequence protection alarm; (ii) a
3) The D02 switch does not switch protection, and switches an automatic function, wherein X time limit is 7s, Y time limit is 5s, and zero sequence protection alarm is 3A/20 s;
4) tie switch L30 switches to tie switch automation mode, X time limit 21s, Y time limit 5 s.
due to the requirement of automation construction, most of automatic switches in actual production are put into a power grid to operate before the automation matching logic is realized, so that the operation of the automatic functions needs to be realized by setting the in-operation switches and the controllers. Therefore, after the previous work is sufficiently ready, the next step requires software updates and parameter settings for the automation devices of the field operating line.
The setting method comprises the following steps: firstly, updating software of terminals with corresponding models according to software versions passing the test, wherein the software updating comprises checking with a point table of a main station; and setting information such as protection setting values, automation parameters and the like according to the protection automation configuration scheme. And under the condition that the condition allows, setting a related fault sequence on the basis, testing the terminal by using the single body, and after the test is successful, putting the terminal into automatic operation, wherein the automatic function is formally started.
During commissioning, the following should be noted: 1) when the software version is updated or the parameters are set, the terminal opening and closing pressing plate is withdrawn; 2) the switch with the PT at the two sides is required to check the butting correctness of the aerial plug of the PT switch at the two sides and the aerial plug connector of the terminal; 3) two sides of the connection switch are provided with disconnecting links; 4) and if the voltage-loss brake can be set, the value is between 0.3s and 1.0s, and the like.
after the automatic function is put into operation, the remote signaling and remote measuring information of the terminal and the master station is checked in time, the operation condition is tracked and observed, particularly, after a fault occurs, whether the fault point is consistent with the automatic positioning result or not is checked, and whether the protection and automation actions are correct or not is judged; if an abnormal condition occurs, the problem is searched, and adjustment and optimization are carried out according to the condition.
The technical scheme mainly for the automation of the local feeder is as follows:
when a feeder line has a fault, firstly tripping is carried out by an outgoing switch with protection, the whole line has power failure, voltage time type switches arranged on a line detect voltage loss tripping, the outgoing switch recloses, power supply is restored step by each voltage time type switch until the switch is closed and the fault trips again, a voltage time type switch controller FTU closes through a residual voltage locking switch, and the next incoming call is not closed again, so that the function of positioning the fault by the first reclosing is completed; and after the fault trips for the second time, delaying the closing for the second time and gradually recovering the non-fault area.
For the two types of circuits, namely a radiation type circuit and a communication circuit, the essence that the local feeder automation is adopted to realize the section positioning is the same, namely the fault positioning is realized by matching a starting switch reclosing with a voltage time type FTU, and the processing principles of the two types of circuits are as follows:
(1) single radiating line in-place type feeder automation scheme
The single radiation line and the in-situ feeder automation are larger in recovery non-fault area only when the tail end is in fault, and if the tail end is in fault, the rear non-fault area cannot be recovered due to the fact that no connection line supplies power. A schematic diagram of the single radiating line in-situ feeder automation is shown in fig. 15.
(2) In-place feeder automation scheme for interconnection line
Fig. 16 is a schematic diagram of the operation of the hand-pulling communication line. If the instantaneous fault is automatically avoided, the power transmission is recovered; if the fault is a permanent fault, tripping again; and recovering the power supply of the normal section after the fault isolation is finished.
The local feeder automation adopts a voltage type switch, an electromagnetic mechanism and a super capacitor for power supply; the switch is switched on and off twice; the voltage type switch has the characteristics of 'delayed closing of incoming call and release without voltage', and the action is reliable; and the outgoing switch is superposed twice to complete fault positioning and isolation. Reclosing for the first time, and locking switches on two sides of a fault point to isolate faults; secondary superposition, restoring power supply of a non-fault area at the power supply side; when the first section of the circuit fails, the outgoing switches can always be successfully superposed.
Claims (8)
1. The method is characterized in that the method is used for carrying out terminal automatic function testing, formulating an automation and protection configuration scheme according to the characteristics of the line, carrying out software updating and parameter setting on the terminal on site and observing the operation condition, and adopts a technical scheme mainly based on the on-site type feeder automation, so that the automatic line mode operation is realized, and the operation efficiency of the on-site type feeder automation function of the distribution line is improved.
2. The method of claim 1, wherein the developing terminal automation function test is a unified test of automation functions of all manufacturers to determine the on-site operable automation software versions of each manufacturer; the functional verification comprises: terminal voltage-loss tripping logic, incoming call delay closing, fault locking logic, interconnection switch locking and power transmission logic and terminal debugging mode logic; in the test process, at least 4 intelligent terminals are required to carry out combined debugging, and the debugging content comprises contact mode testing and single radiation mode testing.
3. The method of claim 1, wherein the planned automation and protection configuration plan comprises a single radiating line and a connecting line; in the process of making the scheme, the following principles are followed: 1) the on-site feeder automation function is fully exerted, and the power failure range is reduced as much as possible; 2) the automation and the protection are combined, so that the tripping times are reduced as much as possible, and the electricity consumption feeling of a user is improved; 3) the scheme is matched with the characteristics of the circuit, and the position of the switch is not moved as much as possible.
4. The method for on-site feeder automation function-modeled commissioning of distribution line of claim 1, wherein the software update and parameter setting are performed to the terminal by the following steps: firstly, updating software of terminals with corresponding models according to software versions passing the test, wherein the software updating comprises checking with a point table of a main station; setting a protection fixed value and automation parameter information according to a protection automation configuration scheme; and under the condition that the condition allows, setting a related fault sequence on the basis, testing the terminal by using the single body, and after the test is successful, putting the terminal into automatic operation, wherein the automatic function is formally started.
5. The method for the on-site feeder automation functional modeling of the distribution line according to claim 1, wherein the operation condition is observed, and after the automation function is put into operation, the remote signaling and remote measuring information of the terminal and the master station are checked in time to track and observe the operation condition; particularly, after a fault occurs, whether the fault point is consistent with an automatic positioning result or not is checked, and whether protection and automation actions are correct or not is judged; if an abnormal condition occurs, the problem is searched, and adjustment and optimization are carried out according to the condition.
6. The method of claim 1, wherein the local feeder automation function is mainly implemented by the local feeder automation method,
when a fault occurs, firstly tripping is carried out by an outgoing line switch with protection, the whole line has power failure, voltage time type switches arranged on a line detect voltage loss tripping, the outgoing line switch recloses, power supply is restored step by the voltage time type switches until the voltage time type switches are switched off again when the fault occurs, the voltage time type switch controller FTU closes through a residual voltage locking switch, and the fault is not positioned when the next incoming call is received, so that the function of positioning the fault by the first reclosing is completed; and after the fault trips for the second time, delaying the closing for the second time and gradually recovering the non-fault area.
7. The distribution line feeder automation functional modeling method of claim 2, wherein the tie mode comprises a start switch CB and a tie switch LL, all of the rest are section switches D01 and D02, and the debugging should simulate the fault of at least three areas, the fault of three areas being between the start switch CB and the section switch D01, between the section switch D01 and the section switch D02, and between the section switch D02 and the tie switch LL.
8. The distribution line feeder automation functional mode commissioning method of claim 2, wherein the single radiation mode comprises a start switch CB, a link switch LL, and all the rest of the switches D01 and D02, and the commissioning method is adapted to simulate the fault of at least four areas, the fault of four areas being between the start switch CB and the section switch D01, the area surrounded by three switches D01, D02 and D03, the rear area of the section switch D02 and the rear area of the section switch D03.
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