CN102044864A - Switching control method for switching control system of resistors in parallel - Google Patents
Switching control method for switching control system of resistors in parallel Download PDFInfo
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- CN102044864A CN102044864A CN2009101975455A CN200910197545A CN102044864A CN 102044864 A CN102044864 A CN 102044864A CN 2009101975455 A CN2009101975455 A CN 2009101975455A CN 200910197545 A CN200910197545 A CN 200910197545A CN 102044864 A CN102044864 A CN 102044864A
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Abstract
The invention discloses a switching control method for a switching control system of resistors in parallel, for switching the resistors in parallel in a power grid. The method comprises the following steps of: S1, switching the resistors in parallel in the first time after the system occurs ground faults, wherein the switching time of the resistors in parallel is the second time; S2, continuously switching the resistors in parallel for six times after a delay of the third time, wherein the first switching time is the fourth time; the interval time is the fifth time; the first time to the fifth time are positive numbers more than zero, wherein the first time is 10s; the second time is 300mS; the third time is10 min; the fourth time is 100mS; and the fifth time is 10S. The method can exactly select faulty lines according to variation of a zero sequence current, rationally control the switching time of the resistors in parallel, and improve the reliability of power supply. The method does not bring bad influence to equipment and the power grid.
Description
Technical field
The present invention relates to the transformer station field, relate in particular to the switching control method that is used for parallel connection resistance switching control system in a kind of transformer station.
Background technology
Along with fast development of national economy, the load of power circuit is in continuous increase, and radius of electricity supply also strengthens thereupon, and branched line is also increasing; Urban power distribution network progressively transform operational modes such as trunk, looped network, dual-ring network, contact, open loop as by trunk outdiffusion type, and the city overhead wire is powered cable gradually and replaces.
Line construction becomes increasingly complex, in case break down, searches just unusual difficulty of concrete fault point, several hours at least, tens hours at most, both influenced the reliability of power supply, again to people produce, life brings very big loss and inconvenience.
In all kinds of faults of overhead wire, central point isolated neutral system single phase ground fault is the type of the most difficult detection and judgement in all fault types; Because operational mode is special, when single-phase earthing took place, phase current can not undergone mutation, and brought a series of problems for the fault detector of being good at the single-phase fault feature detection on fault judgement, had influenced safe power supply.
Therefore how can select faulty line accurately is the problem that applicant of the present invention is devoted to study.
Summary of the invention
The objective of the invention is to overcome the defective of prior art and a kind of switching control method that is used for parallel connection resistance switching control system is provided, can select faulty line exactly according to the variation of zero-sequence current, the switching time of resistance in the control parallel connection rationally, can not bring adverse effect, improve the reliability of power supply to equipment and electrical network.
The technical scheme that realizes above-mentioned purpose is: a kind of switching control method that is used for parallel connection resistance switching control system, resistance in the parallel connection in the electrical network is carried out switching, resistance switching control system comprises the transformer that connects on the electrical network, the vacuum circuit-breaker that links to each other with this transformer in the described parallel connection, described vacuum circuit-breaker is by grounding through resistance in the parallel connection, wherein, this method may further comprise the steps:
Step S1, system resistance in the switching parallel connection after the generation earth fault very first time, the switching time of resistance was second time in the parallel connection;
Step S2, through the time-delay of the 3rd time, resistance in continuous 6 parallel connections of switching, the time of switching was the 4th time each time, be the 5th time blanking time, and wherein, first to the 5th time was the positive number greater than zero, wherein, the very first time is 10 seconds, and second time was 300mS, and the 3rd time was 10 minutes, the 4th time was 100mS, and the 5th time was 10S.
The invention has the beneficial effects as follows: the present invention is by resistance in the switching parallel connection, zero sequence line according to every line flows warp can be selected faulty line exactly, after route selection finishes, can cooperate fault alarm to realize the overhead wire fault location, resistance in the switching parallel connection repeatedly, by the rational control switching time, can't bring adverse effect to equipment and electrical network, guaranteed the reliability of power supply.
Description of drawings
Fig. 1 is the system configuration schematic diagram of one of resistance switching control system in the available parallel connection in the resistance switching control method in the parallel connection of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.The resistance switching control method is applicable to resistance switching control system in most parallel connections in the parallel connection of the present invention, will lift below that resistance switching control system describes in the typical parallel connection, sees also Fig. 1.
Among Fig. 1, resistance switching control system system comprises and connects the transformer T on the electrical network and be connected in some circuits 1 on the same bus in the parallel connection, also comprise vacuum circuit-breaker K, the arc suppression coil L and the voltage transformer pt that link to each other with transformer T, vacuum circuit-breaker K is by resistance R ground connection in the parallel connection, arc suppression coil L is by a damping resistance r ground connection, wherein:
The neutral point voltage of voltage transformer pt measuring transformer T;
Vacuum circuit-breaker K is the switch of resistance R switching in the control parallel connection.
A kind of method that is used for parallel connection resistance switching control system of the present invention is carried out switching to resistance in the parallel connection in the electrical network, may further comprise the steps:
Step S1, resistance in the switching parallel connection behind the generation earth fault very first time t1 of system, the switching time of resistance is the second time t2 in the parallel connection;
Step S2, through the time-delay of the 3rd time t3 time, resistance in continuous 6 parallel connections of switching, the time of switching is the 4th time t4 each time, and be the 5th time t5 blanking time, and wherein, very first time t1～the 5th time t5 is the positive number greater than zero.
Consider the accuracy of earthing wire-selecting function, the overcurrent heat-sinking capability of resistance R in the parallel connection, through a series of actual tests analysis, the time of each section has been done rational regulation, that is: very first time t1 is 10 seconds; The second time t2 is 300mS; The 3rd time t3 is 10 minutes; The 4th time t4 is 100mS; The 5th time t5 is 10S.
The switching of resistance in the parallel connection in the whole process has divided 5 time periods, and the setting to each timing node describes below.
Very first time t1: this time is 10 seconds, and this time is the fault time that escapes instant earthing;
The second time t2: this time is 300mS, and resistance in the switching parallel connection is for failure line selection;
The 3rd time t3: this time is 10 minutes, the controller (not shown) of arc suppression coil is informed fault location main website (not shown) with the failure line selection result, and the latter informs the continuous required time of switching signal of resistance in each fault alarm (not shown) preparation seizure;
The 4th time t4: this time is 100mS, satisfies fault alarm and measures the required time;
The 5th time t5: this time is 10S, and this time is for buffer time, and the vacuum circuit-breaker that guarantees resistance switching in the control parallel connection is normal precision maneuver each time.
In the implementation case, 5 circuits are arranged on the 10kV bus; Arc suppression coil L overcompensation is 5%; Transformer T no-load voltage ratio is 110/10kV; System capacitance C on each circuit 1 is 27.25uf; Arc suppression coil L inductance is 0.34H; The resistance of resistance R is 136 ohm in the parallel connection; I10, I20, I30, I40, I50 are the zero-sequence current of 5 circuits among the figure.
Resistance R adopts the ZX18-44 resistor in series to form in the parallel connection, and the service behaviour of this resistor is as shown in the table.
The service behaviour of table 1ZX18-44 resistor
The rated current of this resistor is 11A; Short circuit is in the time of 3 seconds, and the maximum current that this resistor can carry is 65A; Short circuit is in the time of 5 seconds, and the maximum current that this resistor can carry is 51A; Short circuit is in the time of 10 seconds, and the maximum current that this resistor can carry is 36A; Short circuit is in the time of 15 seconds, and the maximum current that this resistor can carry is 30A.Short circuit is in the time of 20 seconds, and the maximum current that this resistor can carry is 26A; Short circuit is in the time of 30 seconds, and the maximum current that this resistor can carry is 22A.
To the 10kV system, the resistance of resistance R is 150 ohm in the parallel connection, and when system's generation metallic earthing fault, the voltage of system neutral is higher, is about 6000V, and the maximum active current that resistance R produces in parallel connection this moment is 40A; When system's generation high resistance ground, systematically neutral point voltage is lower, is about 2000V, and the active current that resistance produces in parallel connection this moment only is 13.3A.
As known from the above, system is under the metallic earthing situation, and the electric current maximum that resistance R produces in the parallel connection is calculated according to the service behaviour of resistor, but resistance trouble free service 6～8 seconds in the parallel connection.In whole fault location process, need switching 7 times by resistance R in the designing requirement parallel connection, can adjust as required, in the parallel connection the total making time of resistance R less than 900mS, less than 1 second, therefore, resistance R can be because of not overheated and damage in the parallel connection.
When system's generation earth fault, resistance in the switching parallel connection, faulty line can increase by one group of characteristic zero-sequence current, relatively can have greatly changed with original load current, and the present invention promptly accurately selects faulty line according to this variation.
The repeatedly switching mode of resistance R in the parallel connection, can not bring too big damage to resistance R in the parallel connection, reason: the switching of resistance R is by the software program control of controller (not shown) in the parallel connection, the number of times of switching and time, can make amendment in program, therefore the time and the number of times of resistance R do not have technical problem from the switching parallel connection; The repeatedly switching of resistance R can cause resistance overheated in the parallel connection, heat radiation is the subject matter of required consideration during the resistance R switching in the parallel connection in time, therefore, and during system generation earth fault, resistance R was carried out the switching second time after for the first time switching is finished route selection again in the parallel connection through 10 minutes; Switching for the second time, although adopt repeatedly switching mode, the time of each switching is shorter, total time is not more than 600mS, can not cause the overheated of resistance R in the parallel connection; The repeatedly switching of resistance R can not cause adverse effect to electrical network in the parallel connection, because the making time of resistance R is shorter in the parallel connection, the active current of injecting electrical network is less, can not cause bad influence to electrical network.
Below embodiment has been described in detail the present invention in conjunction with the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not constitute limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (1)
1. switching control method that is used for parallel connection resistance switching control system, resistance in the parallel connection in the electrical network is carried out switching, resistance switching control system comprises the transformer that connects on the electrical network, the vacuum circuit-breaker that links to each other with this transformer in the described parallel connection, described vacuum circuit-breaker is by grounding through resistance in the parallel connection, it is characterized in that this method may further comprise the steps:
Step S1, system resistance in the switching parallel connection after the generation earth fault very first time, the switching time of resistance was second time in the parallel connection;
Step S2, through the time-delay of the 3rd time, resistance in continuous 6 parallel connections of switching, the time of switching was the 4th time each time, be the 5th time blanking time, and wherein, first to the 5th time was the positive number greater than zero, wherein, the very first time is 10 seconds, and second time was 300mS, and the 3rd time was 10 minutes, the 4th time was 100mS, and the 5th time was 10S.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101975455A CN102044864A (en) | 2009-10-22 | 2009-10-22 | Switching control method for switching control system of resistors in parallel |
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| CN2009101975455A CN102044864A (en) | 2009-10-22 | 2009-10-22 | Switching control method for switching control system of resistors in parallel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323515A (en) * | 2011-06-16 | 2012-01-18 | 山东电力集团公司德州供电公司 | System and method applied to fault section positioning in resonant earthing system |
| CN104251959A (en) * | 2014-09-18 | 2014-12-31 | 云南电网公司电力科学研究院 | Method and device for positioning and detecting single-phase grounding fault of power distribution grid |
| CN112526295A (en) * | 2020-11-27 | 2021-03-19 | 国网陕西省电力公司铜川供电公司 | Multiple traveling wave and composite zero sequence current measurement line selection grounding protection system and method |
-
2009
- 2009-10-22 CN CN2009101975455A patent/CN102044864A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323515A (en) * | 2011-06-16 | 2012-01-18 | 山东电力集团公司德州供电公司 | System and method applied to fault section positioning in resonant earthing system |
| CN104251959A (en) * | 2014-09-18 | 2014-12-31 | 云南电网公司电力科学研究院 | Method and device for positioning and detecting single-phase grounding fault of power distribution grid |
| CN104251959B (en) * | 2014-09-18 | 2017-03-08 | 云南电网公司电力科学研究院 | A kind of system for detecting and positioning one-phase earthing failure in electric distribution network |
| CN112526295A (en) * | 2020-11-27 | 2021-03-19 | 国网陕西省电力公司铜川供电公司 | Multiple traveling wave and composite zero sequence current measurement line selection grounding protection system and method |
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Effective date of registration: 20120924 Address after: 3, No. 246 middle Jiangxi Road, No. 200001, Shanghai, Huangpu District Applicant after: Shanghai Electric Power Communication Co., Ltd. Applicant after: Shanghai Epu Electric Power Technology Co., Ltd. Applicant after: Siyuan Electric Co., Ltd. Applicant after: Shanghai Electric Power Corporation Applicant after: State Grid Corporation of China Address before: 201100, room 2888, 317 Gu Dai Road, Shanghai, Minhang District Applicant before: Shanghai Sinan Electric Power Communication Co., Ltd. Applicant before: Shanghai Epu Electric Power Technology Co., Ltd. Applicant before: Siyuan Electric Co., Ltd. Applicant before: Shanghai Electric Power Corporation |
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