CN110556801B - Power distribution automation FTU locking protection method - Google Patents
Power distribution automation FTU locking protection method Download PDFInfo
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- CN110556801B CN110556801B CN201910857367.8A CN201910857367A CN110556801B CN 110556801 B CN110556801 B CN 110556801B CN 201910857367 A CN201910857367 A CN 201910857367A CN 110556801 B CN110556801 B CN 110556801B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/20—Interlocking, locking, or latching mechanisms
- H01H9/26—Interlocking, locking, or latching mechanisms for interlocking two or more switches
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
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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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/20—Interlocking, locking, or latching mechanisms
- H01H9/26—Interlocking, locking, or latching mechanisms for interlocking two or more switches
- H01H2009/265—Interlocking, locking, or latching mechanisms for interlocking two or more switches with interlocking of more than two switches
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to the technical field of distribution lines, in particular to a distribution automation FTU locking protection method, wherein FTU locking fixed values on a distribution network main line are set according to the number of instantaneous faults within a certain time, then each FTU locking fixed value on the distribution network main line is set from a load side to a power side according to n times/X minutes, n +2 times/X minutes, n +4 times/X minutes and the like, and a fixed value n can be set according to field experience and generally takes the value of 3; when instantaneous fault occurs, each section switch FTU flowing through fault current starts to count the trip times of the timer, and other section switches which do not meet the condition only trip and do not start the trip times function of the timer. The invention has no influence on permanent faults and instantaneous faults, can effectively avoid frequent tripping of the switch for frequent instantaneous faults in a short time, avoids damaging primary equipment and improves the electricity consumption experience of customers.
Description
Technical Field
The invention relates to the technical field of distribution lines, in particular to a distribution automation FTU locking protection method.
Background
The FTU is an intelligent terminal device installed on a distribution room or feeder. The intelligent power distribution system can communicate with a remote power distribution substation, sends the operation data of the power distribution equipment to the power distribution substation, and can also receive the control command of the power distribution substation to control and regulate the power distribution equipment. FTU is small, in large quantity, can settle on outdoor feeder line, is equipped with the changer, and direct interchange sampling is high temperature resistant, and is able to bear or endure severe cold, adapts to outdoor rugged environment.
With the continuous development of power distribution networks, the distribution automation FTU is widely used, and the voltage-time FTU is widely applied due to the advantages that the voltage-time FTU does not need to be matched with the level difference of an outgoing switch of a transformer substation, the requirement on the opening and closing action time of the switch is low, and the like. The existing voltage-time FTU locking method comprises X locking, Y locking and Z locking, permanent faults can be effectively positioned and isolated, but only tripping and reclosing can be realized when instantaneous faults occur, and the switch can only continuously go through the processes of tripping, reclosing, tripping and reclosing aiming at frequent instantaneous faults in a short time, such as instantaneous short circuit of a line caused by tree obstacles and wind separation, frequent tripping not only causes certain damage to primary equipment, but also reduces the electricity utilization experience of customers, and can cause great loss of a distribution line in serious cases.
Disclosure of Invention
In view of this, the present invention provides a distribution automation FTU lockout protection method, which counts transient faults in a set time period through an FTU, and disconnects a switch when a set value is reached, so as to effectively isolate a line segment with the transient fault, thereby being safe and effective, and avoiding risks of equipment damage or other accidents caused by the transient fault. Meanwhile, the switch is switched on and recovered after being disconnected for a certain period of time, the defects that manual detection of instantaneous faults is time-consuming and labor-consuming are overcome, the intelligence of power supply of a power distribution line section is improved, frequent power failure caused by the instantaneous faults is avoided, and the power consumption experience of a user is improved.
The invention solves the technical problems by the following technical means:
the invention provides a power distribution automation FTU locking protection method, which is specifically executed according to the following steps:
the FTU locking of each section switch on the distribution network main line has two starting modes: (1) the tripping times reach a locking fixed value within a certain time; (2) and the upper-level switch on the power supply side locks and sends a locking signal to the switch on the current level.
S1, the FTU locking fixed value of each section switch on the distribution network main line is set according to the number of tripping caused by instantaneous fault within X minutes;
s2, when instantaneous fault occurs on the main line, FTU of each section switch flowing to the fault section at the power supply side starts timing and trip times are counted, and FTU of other section switches do not count timing and trip times;
s3, when the accumulated number of times of instantaneous faults occurring in X minutes is lower than the locking set value of the FTU, the FTU does not start locking protection, and the current timing and trip time data are emptied;
s4, when the accumulated number of tripping operation times reaches the blocking set value of FTU of a certain section due to instantaneous fault in X minutes, the FTU starts blocking and starts timing, the switch is kept at the opening position and sends a blocking signal to the FTU of the next-stage section switch at the load side, the next-stage FTU immediately starts blocking protection after receiving the signal, the next-stage section switch is blocked at the opening position, other FTUs continue to work normally, instantaneous fault points are isolated, and other live line sections continue to run;
s5, unlocking the locked FTU to a set time Y value, and after the FTU is automatically unlocked, closing the switch in an electrified way in succession and restoring the power supply of the line;
and S6, judging whether the transient fault exists, if not, supplying power normally, and if so, continuing to execute the step S2.
Further, each FTU locking fixed value on the distribution network main line is set from the load side to the power supply side according to n times/X minutes, n +2 times/X minutes and n +4 times/X minutes, and the n fixed value, the X fixed value and the Y fixed value are set according to different line conditions.
Further, after the section switch of the fault section is locked, the interconnection switch starts timing, the Z value which reaches setting is automatically closed, the power supply of the normal line section is recovered, the Z value is set according to different line conditions, and when the switches on the two sides of the interconnection switch are locked, the interconnection switch does not start closing.
According to the distribution automation FTU locking protection method, instantaneous faults are counted in a set time period through the FTU, the switch is disconnected when the set time period is reached, the line section with the instantaneous faults is effectively isolated, safety and effectiveness are achieved, and risks of equipment damage or other accidents caused by the instantaneous faults are avoided. Meanwhile, the switch is switched on and recovered after being disconnected for a certain period of time, the defects that manual detection of instantaneous faults is time-consuming and labor-consuming are overcome, the intelligence of power supply of a power distribution line section is improved, frequent power failure caused by the instantaneous faults is avoided, and the power consumption experience of a user is improved.
Drawings
FIG. 1 is a flow chart of a single power supply procedure operation of a distribution automation FTU lockout protection method of the present invention;
fig. 2 is a schematic diagram of a single power distribution line structure of a distribution automation FTU lockout protection method of the present invention;
fig. 3 is a schematic diagram of a dual power distribution line structure according to a distribution automation FTU lockout protection method of the present invention;
fig. 4 is a flow chart of the operation of a dual power supply program of the distribution automation FTU lockout protection method of the present invention.
Wherein: s1-substation outgoing line breaker; s2-outgoing line breaker of substation 2; 1. 2, 3, 5-main line voltage-time type section switch; 4-a tie switch; 6. 7-branch line section switch.
Detailed Description
The present invention will be described in detail with reference to the drawings and specific embodiments, and it is to be understood that the described embodiments are only a few embodiments of the present invention, rather than the entire embodiments, and that all other embodiments obtained by those skilled in the art based on the embodiments in the present application without inventive work fall within the scope of the present application.
As shown in fig. 1 to 4, according to the distribution automation FTU lockout protection method of the present invention, FTU lockout of each section switch on the distribution network main line has two starting modes: (1) the tripping times reach a locking fixed value within a certain time; (2) the switch reaching the locking constant value is locked and sends a locking signal to the lower-level switch; the method comprises the following steps:
s1, the FTU locking fixed value of each section switch on the distribution network main line is set according to the number of tripping caused by instantaneous fault within X minutes;
s2, when instantaneous fault occurs on the main line, FTU of each section switch flowing to the fault section at the power supply side starts timing and trip times are counted, and FTU of other section switches do not count timing and trip times;
s3, when the accumulated number of times of instantaneous faults occurring in X minutes is lower than the locking set value of the FTU, the FTU does not start locking protection, and the current timing and trip time data are emptied;
s4, when the accumulated number of tripping operation times reaches the blocking set value of FTU of a certain section due to instantaneous fault in X minutes, the FTU starts blocking and starts timing, the switch is kept at the opening position and sends a blocking signal to the FTU of the next-stage section switch at the load side, the next-stage FTU immediately starts blocking protection after receiving the signal, the next-stage section switch is blocked at the opening position, other FTUs continue to work normally, instantaneous fault points are isolated, and other live line sections continue to run;
s5, unlocking the locked FTU to a set time Y value, and after the FTU is automatically unlocked, closing the switch in an electrified way in succession and restoring the power supply of the line;
and S6, judging whether the transient fault exists, if not, supplying power normally, and if so, continuing to execute the step S2.
In this embodiment, each FTU lockout fixed value on the distribution network main line is set from the load side to the power side according to n times/X minute, n +2 times/X minute, and n +4 times/X minute, and the n fixed value, the X fixed value, and the Y fixed value are set according to different line conditions. After the switches are locked, the interconnection switch starts timing, the Z value which reaches setting is automatically closed, power supply of other line sections is recovered, the Z value is set according to different line conditions, and when the switches on two sides of the interconnection switch are locked, the interconnection switch does not start to be closed.
In this embodiment, as shown in fig. 2, the FTU lock constant from the load side to the power side is set to 3 times/30 minutes for the section switch 3, 5 times/30 minutes for the section switch 2, and 7 times/half hour for the section switch 1.
For example, when a transient fault occurs in the c-stage, a fault current flows through the sectionalizing switches 1 and 2, the sectionalizing switches 1 and 2 start to count the number of tripping times of the timer, and the sectionalizing switch 3 is the next-stage switch on the load side and does not sense the fault current, so that the sectionalizing switch 3 does not start the function of counting the number of tripping times of the timer. When the trip times are accumulated to 5 times within 30 minutes in the X time limit, the FTU of the section switch 2 starts blocking, the section switch 2 is blocked at the brake separating position, a blocking signal is sent to the FTU of the next section switch 3 at the load side, the FTU of the section switch 3 immediately starts blocking protection after receiving the blocking signal, the section switch 3 is blocked at the brake separating position, the instantaneous fault point is successfully isolated, the line at the section c is powered off, and the line at the section d is also powered off due to single power supply, so that the normal power supply of the line at the sections a and b is ensured.
Setting the blocking time Y value of the section switch to be 20 minutes, automatically unlocking the section switch after the section switch is blocked for 20 minutes, wherein the instant fault possibly does not exist, simultaneously unlocking the section switches 2 and 3 and sequentially overlapping, and restoring the power supply of the line; if the transient fault still exists, the step switch starts to count the number of tripping times and executes the step S2 again until the transient fault is isolated again.
In this embodiment, the dual power supply is as shown in fig. 3, where the latching fixed value is set to be 3 times/30 minutes for the section switches 3 and 5, 5 times/30 minutes for the section switch 2, 7 times/30 minutes for the section switch 1, and the delay closing time Z value of the interconnection switch is set to be 3 minutes;
for example, a transient fault occurs in the b section, fault current flows through the sectional switch 1, the sectional switch 2 is the next stage switch on the load side, and the sectional switch 1 starts to count the trip times; and no fault current flows through the sectional switches 2, 3 and 5, so that the sectional switches are only tripped due to voltage loss but do not start a timer trip time function.
When the trip times are accumulated to 7 times within 30 minutes, the FTU of the section switch 1 starts blocking, the section switch 1 is blocked at a brake separating position, a blocking signal is sent to the FTU of the next section switch 2 at the load side, the FTU of the section switch 2 immediately starts blocking protection after receiving the blocking signal, the section switch 2 is blocked at the brake separating position, the instantaneous fault point is successfully isolated, the power failure of the lines of the sections b, c and d is caused, and the power supply of the lines of the sections a and e is carried out; when the switches 1 and 2 start locking, the contact switch 4 starts timing, when the contact switch 4 reaches 3 minutes, the contact switch 4 is automatically closed, the section switch 3 is switched on due to power, and the c-section and d-section circuits are recovered for power supply, and at the moment, the section switches 1 and 2 are locked at the switching-off position, so that instantaneous faults are successfully isolated.
And starting timing after the sectional switches 1 and 2 are locked at the opening position, and when the timing reaches 30 minutes, simultaneously unlocking the sectional switches 1 and 2, enabling the sectional switch 1 to be powered on and switched on, recovering the power supply of the section b, and keeping the logic that automatic switching-on is forbidden due to the pressure on two sides of the sectional switch 2 at the locking position. If the instantaneous fault does not exist, the line keeps the current running mode; if the transient fault is still present, the sectionalizer 1 begins to count the number of trips, as described above, until the sectionalizers 1 and 2 latch up, again isolating the b-stage transient fault.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (6)
1. A power distribution automation FTU locking protection method is characterized by comprising the following steps:
s1, the FTU locking fixed value of each section switch on the distribution network main line is set according to the number of tripping caused by instantaneous fault within X minutes;
s2, when instantaneous fault occurs on the main line, FTU of each section switch flowing to the fault section at the power supply side starts timing and trip times are counted, and FTU of other section switches do not count timing and trip times;
s3, when the accumulated number of times of instantaneous faults occurring in X minutes is lower than the locking set value of the FTU, the FTU does not start locking protection, and the current timing and trip time data are emptied;
s4, when the accumulated number of tripping operation times reaches the blocking set value of FTU of a certain section due to instantaneous fault in X minutes, the FTU starts blocking and starts timing, the switch is kept at the opening position and sends a blocking signal to the FTU of the next-stage section switch at the load side, the next-stage FTU immediately starts blocking protection after receiving the signal, the next-stage section switch is blocked at the opening position, other FTUs continue to work normally, instantaneous fault points are isolated, and other live line sections continue to run;
s5, unlocking the locked FTU to a set time Y value, and after the FTU is automatically unlocked, closing the switch in an electrified way in succession and restoring the power supply of the line;
and S6, judging whether the transient fault exists, if not, supplying power normally, and if so, continuing to execute the step S2.
2. The distribution automation FTU latch-up protection method of claim 1, wherein each FTU latch-up constant value on the distribution network main line is set from a load side to a power side according to n times/X minutes, n +2 times/X minutes and n +4 times/X minutes.
3. A distribution automation FTU lockout protection method according to claim 2 wherein the n-rating is set according to different line conditions.
4. A distribution automation FTU lockout protection method according to claim 1 wherein X and Y constants are set according to different line conditions.
5. The distribution automation FTU lockout protection method of claim 1 wherein after lockout of a sectionalizer of a faulted section, a tie switch is started for timing, a Z value which is set according to different line conditions is automatically closed when a set Z value is reached, and normal line section power supply is restored.
6. A distribution automation FTU latch protection method according to claim 5 wherein the tie switch does not initiate a close when the switches on both sides of the tie switch latch.
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| CN201910857367.8A CN110556801B (en) | 2019-09-11 | 2019-09-11 | Power distribution automation FTU locking protection method |
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| CN201910857367.8A CN110556801B (en) | 2019-09-11 | 2019-09-11 | Power distribution automation FTU locking protection method |
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| CN110556801B true CN110556801B (en) | 2021-07-20 |
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| CN101662144A (en) * | 2009-04-30 | 2010-03-03 | 胡诚 | Feeder automation processing method and device of distribution network |
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| CN107565523A (en) * | 2017-10-09 | 2018-01-09 | 山东科汇电力自动化股份有限公司 | A kind of full load switch feeder fault control method |
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| US6545849B1 (en) * | 1999-12-20 | 2003-04-08 | General Electric Company | Instantaneous fault detection circuit method and apparatus |
| CN105281304A (en) * | 2015-12-02 | 2016-01-27 | 国网上海市电力公司 | Quick feeder fault positioning and isolating method |
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2019
- 2019-09-11 CN CN201910857367.8A patent/CN110556801B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662144A (en) * | 2009-04-30 | 2010-03-03 | 胡诚 | Feeder automation processing method and device of distribution network |
| CN201556935U (en) * | 2009-12-01 | 2010-08-18 | 陈家斌 | Automatic control aftercurrent protector |
| CN103001192A (en) * | 2012-11-13 | 2013-03-27 | 山东电力集团公司济南供电公司 | Voltage-time feeder automation control method based on primary station control strategies |
| WO2015197137A1 (en) * | 2014-06-27 | 2015-12-30 | Siemens Aktiengesellschaft | Transient protection for multi-terminal hvdc grid |
| CN106786425A (en) * | 2017-01-16 | 2017-05-31 | 中国电力科学研究院 | A kind of coincidence formula failure separation method and system on the spot |
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