CN102636732B - Method for searching for 10kV power grid grounding based on six-sigma tool - Google Patents
Method for searching for 10kV power grid grounding based on six-sigma tool Download PDFInfo
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- CN102636732B CN102636732B CN201210112592.7A CN201210112592A CN102636732B CN 102636732 B CN102636732 B CN 102636732B CN 201210112592 A CN201210112592 A CN 201210112592A CN 102636732 B CN102636732 B CN 102636732B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000003324 Six Sigma (6σ) Methods 0.000 title claims abstract description 10
- 239000011159 matrix material Substances 0.000 claims abstract description 8
- 238000013459 approach Methods 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 241000272165 Charadriidae Species 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000012549 training Methods 0.000 description 1
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- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Locating Faults (AREA)
Abstract
The invention relates to a method for searching for 10kV power grid grounding based on a six-sigma tool and belongs to the field of power grid running. The method comprises the following steps of: establishing a line database, namely, listing and arraying all branches on a bus bar of an independent 10kV power grid, surveying and filling performance data; establishing a causality matrix, assessing and rating, and sorting; and performing grounding searching operation. According to the method provided by the invention, the six-sigma tool is adopted; a switching sequence table is established on the basis of the data; the hit rate of searching grounding can be increased by using the switching sequence table; the searching time is shortened; the safety running of a power supply system is recovered as soon as possible; and the normal production is ensured.
Description
Technical field
The invention belongs to operation of power networks field, technology and the method for operating of earth fault searched in dispatching of power netwoks, relates to the utilization of quality improvement and analytical approach and the related tool of six Sigma Management.
Background technology
The big-and-middle-sized 10kV of integrated iron and steel works power supply system is main supply network, and wherein the small current neutral grounding system through grounding through arc also occupies certain proportion.Select neutral by arc extinction coil grounding mode, compensated earth point capacitance current, residual flow diminishes, and reaches blow-out, prevents expansion accident.This earthing mode cannot be realized zero-sequenceprotection tripping operation disengagement failure circuit, allows ground connection operation two hours, conventionally adopts Small Electric Current Earthing And Routing Device and artificial pulling load method to search ground path, finds post-tensioning road excision ground path.In actual motion, just because of arc extinction compensation effect, residual flow is little, is subject to the various factors such as the method for operation, earthing position, line parameter circuit value, though producer makes great efforts to improve to line selection device for low current, actual motion route selection accuracy is undesirable, and accuracy is lower than 50%.Therefore artificial experience is searched ground path, is the important means of processing earth fault.Artificial experience is searched ground connection, and object is to use the time as soon as possible, by minimum step, finds out exactly ground path.
Taiyuan Iron and Steel Co. power scheduling, in the process of processing earth fault over the years, though accumulated certain experience, has formed a set of frame-type operation scheme, in processing, substantially can find on request ground path, but still has when exceeding two hours and can not find ground path.In the shortest time, finding ground path or find ground path by minimum operation steps has certain contingency, lacks the operation that a set of more scientific, more accurate system is supported earthing searching.This rule of thumb and sensation are processed earth fault, add peopleware difference, and treatment effect has a great difference, and such operation is more coarse, also not up to standard.This is not suitable with the standardization of work, the propelling target that becomes more meticulous, inadaptable with the corporate strategy target of pursuing being outstanding.
Summary of the invention
The present invention is by setting up 10kV power supply network line characteristic database, use Six Sigma instrument and analytical approach data characteristic on the impact of the ground connection probability sequence of comprehensively giving a mark, the generation tagmeme table of operating a switch.Property database can move actual change according to network system and upgrade, and by computer software, automatically upgrades tagmeme table.This tagmeme table is used in dispatching of power netwoks, improves the reliability of searching ground connection operating basis, improves and searches ground path hit rate.
The present invention be take computing machine as carrier, the grounding fault system of setting up with Six Sigma method, and the relevant valuable module of set (expert's historical experience storehouse, standard earthing searching flow process etc.), can be used as yardman work reference tool and skills training instrument, finally help yardman to find fast ground path, make system avoid extendability breaking accident, recover safe operation, guarantee company's equipment runs well and normal production.
Technical scheme of the present invention is:
1. set up track data storehouse, all shunt lists on a bus of independent 10kV power supply network are arranged, investigate and fill in performance data;
Described performance data project has:
The basis factor:
(1) form of conductors: direct-furnish cable, aerial bare line, suspended insulated guide wire, overground cable, built on stilts and cable segmentation joint line;
(2) cable or aerial condutor length
(3) cable or aerial condutor divide number
(4) cable mid head number
(5) cable trace: dedicated tunnel (ditch), direct-burried
(6) pole line path: building, trees, dust
(7) be with user power utilization maintenance management level
Dynamic factor:
(1) weather: strong wind, thunderstorm, rain and snow mixed (sleet)
(2) break ground the construction of construction, high-altitude,
(3) increase branch (user)
(4) whether test
(5) intermediate cable head increases.
2 set up cause-effect relationship matrix, assessment marking, sequence;
Described cause-effect relationship matrix comprises basic factor causality matrix and dynamic factor causality matrix.
Basis factor causality matrix table:
Dynamic factor causality matrix table:
Each circuit marking sequence
The project of red sign is relevant with quantity or number, and their score value is processed by following:
N is plowed to circuit to be arranged by descending order according to number or quantity, 1/n(, with fractional representation, is retained to two-decimal) as differential, this project total points in table 1, table 2 of take is radix, maximum score value is: radix+n/n, the second score value are: radix+(n-1)/n ... finally
Score value: a radix+1/n.Like this, each circuit has again big or small fine difference not departing under the prerequisite of basic minute of this characteristic, plays by a minute effect for sequence.
3 earthing searching operation stepss:
The first step, searches ground path by ground connection Selected Inspection device, tries to operate a switch selected circuit, if ground connection is eliminated after operating a switch, illustrates and searches correctly; If do not find ground path, carry out artificial search program.
Second step, cuts apart electrical network, by drawing bus connection switch, interconnection to operate earthing electric network on a large scale, cuts apart, finally only have one section of busbar grounding, just can use the circuit tagmeme table of operating a switch, by tagmeme examination bracing wire road, in order to get rid of whether ground connection of interconnection, can first try to draw interconnection.
The 3rd step, by the tagmeme table examination bracing wire road of operating a switch, if announcement trunk user is out of service, line-to-ground is just eliminated, and this is single supply user ground connection; If before bracing wire road, user does not have a power failure, load switching, to other power supply, is found to ground connection transfer, this is dual power supply user ground connection; If there is no above-mentioned two situations, circuit outlet master switch is pulled open, by tagmeme, draw successively, until ground connection is eliminated, find ground path.
The 4th step, reparation is specifically searched and processed to notice site work personnel's earth wire road earth point.
4 experts databases, record the processing procedure of all previous earth fault, with forum's message way of submission, this fault handling are proposed to personal view and suggestion, by interchange, improve earth fault processing horizontal.
5 earth fault processing horizontal monitoring, being about to the horizontal key element of all previous grounding records and compares: as find ground path through the item number of grid switching operation, elapsed time, the operate a switch number etc. of circuit of examination, with diagrammatic form, represent, for finding the also variation of evaluation work level.
Beneficial effect of the present invention
The present invention uses Six Sigma instrument, by data, is according to setting up the tagmeme table of operating a switch, using this tagmeme table to improve and search ground connection hit rate, shorten and search the time, make electric power system recover as early as possible safe operation, guarantee normally to produce, a kind of unprecedented theory of operation foundation is provided.
To every time circuit according to different qualities marking sequence, by every time circuit according to ranked first of ground connection possibility maximum, the like, last tagmeme ground connection possibility is minimum.When this busbar grounding, preferential examination stop sorting first circuit, hit rate improves.
Embodiment
Embodiment: the line characteristic data of the one section of bus belt in Shanxi Taigang Stainless Steel Co., Ltd's step-down station are:
1. three steel power 1#: direct-furnish cable, cable duct, two intermediate cable heads
2. three steel power 3#: direct-furnish cable, cable duct
3. shaft furnace 2# line: direct-furnish cable, cable duct, two users, newly reconstruct circuit
4. coking 5#: direct-furnish cable, cable duct, stand the test in the recent period
5. the 1# of Dongchan: direct-furnish cable, cable duct, part direct-burried, two users, You Liang branch, 3 medial head
6. 3# extinguishing arc: direct-furnish cable, cable vault, cable are very short
7. sintering 6#: direct-furnish cable, two users
8. fully utilize line: overground cable mixes, multi-user, multiple-limb, certain customers' equipment control is poor, 5 of medial head, partial cables direct-burried
Line length comparison: 8. > 5. > 3. > 4. > 7. > 1. > 2. > is 6.
According to standards of grading, fill in following table:
* cable and the differential 1/8=0.125 of built on stilts length;
⑧90+1=91 ⑤30+7/8=30.875 ③30+6/8=30.75
④30+5/8=30.625 ⑦30+4/8=30.5 ①30+3/8=30.375
②30+2/8=30.25 ⑥30+1/8=30.125
Only has ⑧⑤You branch, differential 1/2=0.5
⑧54+1=55 ⑤38+0.5=38.5
8. 5. 1. there is intermediate cable head: differential 1/3=0.333
⑧38+1=39 ⑤38+0.666=38.666 ①38+0.333=38.333
8. 5. have direct-buried cable, 5. > is 8. for direct-burried part: differential 0.5
⑧98+0.5=98.5 ⑤98+1=99
Fill in the tagmeme table of operating a switch:
If there was inclement weather the same day, at overhead type circuit, add corresponding score value, form interim tagmeme table.In order to using.To take bus as unit through all circuits of extinguishing arc earthed system after the same method, generate the tagmeme table of operating a switch separately, in order to using.
, when ground connection occurs, the first step, searches ground path by ground connection Selected Inspection device, the examination selected circuit of operating a switch, if ground connection is eliminated after operating a switch, illustrate and searches correctly.If do not find ground path, carry out artificial search program.
Second step, cuts apart electrical network, will be on a large scale earthing electric network cut apart (by drawing the operations such as bus connection switch, interconnection), finally only have one section of busbar grounding, just can use the circuit tagmeme table of operating a switch, by tagmeme, try bracing wire road.In order to get rid of whether ground connection of interconnection, can first try to draw interconnection.
The 3rd step, exactly by the tagmeme table examination bracing wire road of operating a switch.If announcement trunk user (stopping equipment) out of service line-to-ground is just eliminated, this is single supply user ground connection.If before bracing wire road, user does not have a power failure, load switching, to other power supply, is found to ground connection transfer, this is dual power supply user ground connection.If there is no above-mentioned two situations, circuit outlet master switch is pulled open, by tagmeme, draw successively, until ground connection is eliminated, find ground path.
The 4th step, reparation is specifically searched and processed to notice site work personnel's earth wire road earth point.
Claims (1)
1. based on Six Sigma instrument, search a method for 10kV electrical network ground connection, it is characterized in that comprising and set up track data storehouse, all shunt lists on a bus of independent 10kV power supply network are arranged, investigate and fill in performance data; Set up cause-effect relationship matrix, use Six Sigma instrument and analytical approach performance data on the impact of the ground connection probability sequence of comprehensively giving a mark, the generation tagmeme table of operating a switch; Earthing searching operation steps; Described earthing searching operation steps is: the first step, by ground connection Selected Inspection device, search ground path, and try to operate a switch selected circuit, if ground connection is eliminated after operating a switch, illustrate and search correctly; If do not find ground path, carry out artificial search program;
Second step, cuts apart electrical network, by drawing bus connection switch, interconnection to operate earthing electric network on a large scale, cuts apart, finally only have one section of busbar grounding, just use the circuit tagmeme table of operating a switch, by tagmeme examination bracing wire road, in order to get rid of whether ground connection of interconnection, interconnection is drawn in first examination;
The 3rd step, by the tagmeme table examination bracing wire road of operating a switch, if announcement trunk user is out of service, line-to-ground is just eliminated, and this is single supply user ground connection; If before bracing wire road, user does not have a power failure, load switching, to other power supply, is found to ground connection transfer, this is dual power supply user ground connection; If there is no above-mentioned two situations, circuit outlet master switch is pulled open, by tagmeme, draw successively, until ground connection is eliminated, find ground path;
The 4th step, reparation is specifically searched and processed to notice site work personnel's earth wire road earth point.
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| CN106501676A (en) * | 2016-11-02 | 2017-03-15 | 国网福建省电力有限公司 | A kind of method based on electrical power distribution automatization system lost territory failure line selection |
| CN111930729B (en) * | 2020-07-02 | 2021-04-06 | 上海微亿智造科技有限公司 | Method and system for dynamically calculating six-sigma numerical value of large data volume in real time |
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Non-Patent Citations (4)
| Title |
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| 六西格玛管理在电解铝行业的应用;李钊;《四川有色金属》;20051231(第4期);37-42 * |
| 六西格玛管理法在供电服务中的应用;胡笳等;《广东电力》;20090331;第22卷(第3期);47-51 * |
| 李钊.六西格玛管理在电解铝行业的应用.《四川有色金属》.2005,(第4期),37-42. |
| 胡笳等.六西格玛管理法在供电服务中的应用.《广东电力》.2009,第22卷(第3期),47-51. |
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