CN105281255A - A medium-voltage power supply line capacity-expanding and reconstruction method - Google Patents
A medium-voltage power supply line capacity-expanding and reconstruction method Download PDFInfo
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- CN105281255A CN105281255A CN201510803577.0A CN201510803577A CN105281255A CN 105281255 A CN105281255 A CN 105281255A CN 201510803577 A CN201510803577 A CN 201510803577A CN 105281255 A CN105281255 A CN 105281255A
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Abstract
The invention provides a medium-voltage power supply line capacity-expanding and reconstruction method. Wires for a power supply line are divided conductors. The method comprises the steps that: firstly enterprises or production units with own electric systems apply for power failure of special lines in advance and prepare for unit operation; secondly, pole and line fittings of the original power supply line are detached; thirdly, new fittings are mounted and a new power supply line is set up; fourthly, protection definite values of segmented current are set; fifthly, the new power supply line is put into operation after passing the tests. The medium-voltage power supply line capacity-expanding and reconstruction method is simple to implement, low in investment cost, and convenient in metering; the time of influence of butt joint on production is short; divided conductors with great insulation performance are used for capacity-expanding and reconstruction, so that the operation and maintenance costs of lines are effectively reduced.
Description
Technical field
The present invention relates to a kind of supply line extending capacity reformation method, especially relate to a kind of medium voltage line extending capacity reformation method.
Background technology
Along with the continuous expansion of enterprise development scale, the power consumption of major part enterprise increases considerably, correspondingly the requirement of electric load demand and power supply reliability is improved constantly, existing supply line power supply capacity is caused not meet Production requirement, again set up current supply circuit and will face following problem: 1. invest too large, 220 yuan/KVA high reliability must be paid for the electricity charge and equipment, material and installation fee; 2. need separately to increase outlet corridor; 3. internal bus need do segmentation transformation; 4. protect, measure be not easy to design.
Medium voltage line refers to that voltage is the supply line of 10 ~ 35KV.Existing medium-pressure electricity supply overhead wire seldom adopts bundle conductor, and wire diameter is limited, easily form power supply capacity bottleneck, and manufacturing enterprise needs when device start and stoppage in transit electric power system to provide larger electricity.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, provides a kind of simple to operate, the medium voltage line extending capacity reformation method that cost of investment is low.
The technical solution adopted for the present invention to solve the technical problems is: a kind of medium voltage line extending capacity reformation method, and its supply line's line adopts bundle conductor, comprises the following steps:
1) be with the enterprise of providing electric power system for oneself or production unit to apply for that special line has a power failure in advance, carry out unit operation and prepare;
2) the bar line gold utensil of former supply line is removed;
3) more renew gold utensil, and set up new supply line;
4) the protection definite value of segmented current is set;
5) put into operation after pass the test.
Described new supply line adopts bar two-wire in-phase version altogether to power.
In step 4), described protection definite value is: overcurrent I section of electric current 20A; Overcurrent II section of electric current 13A, 0.6s; Overcurrent III section of electric current 6.4A, 0.8S, K=800/5A.
The beneficial effect of a kind of medium voltage line of the present invention extending capacity reformation method: simple to operate, cost of investment is low, metering is convenient, and it is short that docking affects the production time, and extending capacity reformation adopts bundle conductor, and its good insulating, effectively reduces the operation expense of circuit.
Accompanying drawing explanation
Fig. 1-for existing enterprise adopt supply line's structural representation;
The structural representation of the new supply line of Fig. 2-adopt for a kind of medium voltage line extending capacity reformation method.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
A kind of medium voltage line extending capacity reformation method, its supply line's line adopts bundle conductor, comprises the following steps:
1) be with the enterprise of providing electric power system for oneself or production unit to apply for that special line has a power failure in advance, carry out unit operation and prepare;
2) the bar line gold utensil of former supply line is removed;
3) more renew gold utensil, and set up new supply line;
4) the protection definite value of segmented current is set: overcurrent I section of electric current 20A; Overcurrent II section of electric current 13A, 0.6s; Overcurrent III section of electric current 6.4A, 0.8S.K＝800／5A；
5) put into operation after pass the test.
Described new supply line adopts bar two-wire in-phase version altogether to power, and its structure as shown in Figure 2.
For the present situation of our company's tea hill col salt industry medium voltage line and extending capacity reformation thereof, the invention will be further described below.
Through rough estimates, for meeting normal need of production, company's tea hill col salt industry power load is at about 17000KW.At present, the following two kinds of modes of the many employings of independent power generation pattern:
One is that 1# generator and 3# generator run jointly, and now energy output is generally about 20000KW (wherein the generating of 1# machine 5500KW, 3# machine generating 14500KW), and outer power transmission is 0 ~ 3000KW;
Two is that 2# generator and 3# generator run jointly, and now energy output is generally about 18000KW (wherein the generating of 2# machine 3000KW, 3# machine generating 15000KW), and outer power transmission is 0 ~ 1000KW.
Tea salt interconnection ruuning situation is: tea salt interconnection wire diameter (conductor cross-section) is 240mm
2maximum carrying capacity is 618A; bus penetration is 9000KW; the protection definite value CT no-load voltage ratio of tea col power transformation device is 800/5A, and electric current III segment protect action definite value is 5.1A(time delay 1 second), be so limited 300 switching current III segment protect action definite values and be set as 4.6A(time delay 1 second); corresponding load is roughly 10600KW; namely moment impact load just there will be overload tripping operation more than 300 switches during 10600KW, cuts off mains supply, jeopardizes production run.
Because 3# generator output situation cannot carry out load rejecting test.But in actual motion; if 3# generator is prominent load rejection for some reason; the power of interconnection carrying has 11500KW(17000KW ~ 5500KW in the first ruuning situation down to I haven't seen you for ages); 14000KW(17000KW ~ 53000KW can be reached) under the second ruuning situation; the load rejection as long as visible 3# generator is dashed forward, the power of interconnection carrying all more than 10600KW, can must cause 300 switch protection tripping operations; company Intranet is disintegrated, and has a strong impact on equipment safety operation.In addition when abnormal running situation, if outer electricity consumption is more than 7000KW, as long as start a high-voltage motor also there will be above-mentioned trip accident.
In view of above-mentioned present situation, company proposes to carry out extending capacity reformation to company's medium voltage line, mainly contains following several scheme, specifically as shown in table 1.
Consider cost of investment, to production run effect and later stage carrying cost, the medium voltage line extending capacity reformation method (the A scheme namely in table 1) that company have employed the present patent application carries out extending capacity reformation, pass through comparative analysis, its cost of investment is low, relative to setting up the cost of investment that extending capacity reformation scheme that tea salt interconnection II and former tea salt line parallel run saves 46.5%, and affect little on production run.
Claims (3)
1. a medium voltage line extending capacity reformation method, its supply line's line adopts bundle conductor, it is characterized in that, comprises the following steps:
1) be with the enterprise of providing electric power system for oneself or production unit to apply for that special line has a power failure in advance, carry out unit operation and prepare;
2) the bar line gold utensil of former supply line is removed;
3) more renew gold utensil, and set up new supply line;
4) the protection definite value of segmented current is set;
5) put into operation after pass the test.
2. medium voltage line extending capacity reformation method as claimed in claim 1, is characterized in that, described new supply line adopts bar two-wire in-phase version altogether to power.
3. medium voltage line extending capacity reformation method as claimed in claim 1 or 2, it is characterized in that, in step 4), described protection definite value is: overcurrent I section of electric current 20A; Overcurrent II section of electric current 13A, 0.6S; Overcurrent III section of electric current 6.4A, 0.8S, K=800/5A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510803577.0A CN105281255A (en) | 2015-11-20 | 2015-11-20 | A medium-voltage power supply line capacity-expanding and reconstruction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510803577.0A CN105281255A (en) | 2015-11-20 | 2015-11-20 | A medium-voltage power supply line capacity-expanding and reconstruction method |
Publications (1)
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| CN105281255A true CN105281255A (en) | 2016-01-27 |
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| CN201510803577.0A Pending CN105281255A (en) | 2015-11-20 | 2015-11-20 | A medium-voltage power supply line capacity-expanding and reconstruction method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2879209Y (en) * | 2006-03-06 | 2007-03-14 | 华东电力试验研究院 | On-line monitoring device for transmission Lines dynamic monitoring capacity enlargement system |
| CN101034806A (en) * | 2006-03-06 | 2007-09-12 | 华东电力试验研究院 | Dynamic monitoring and expansion system of power transmission line and its expansion method |
| CN101404388A (en) * | 2008-11-14 | 2009-04-08 | 大庆油田有限责任公司 | Single-bus segmented double-arrangement transforming station bus replacing construction method |
| CN201600934U (en) * | 2009-11-04 | 2010-10-06 | 特变电工股份有限公司 | Strengthened core expanded diameter conductor |
-
2015
- 2015-11-20 CN CN201510803577.0A patent/CN105281255A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2879209Y (en) * | 2006-03-06 | 2007-03-14 | 华东电力试验研究院 | On-line monitoring device for transmission Lines dynamic monitoring capacity enlargement system |
| CN101034806A (en) * | 2006-03-06 | 2007-09-12 | 华东电力试验研究院 | Dynamic monitoring and expansion system of power transmission line and its expansion method |
| CN101404388A (en) * | 2008-11-14 | 2009-04-08 | 大庆油田有限责任公司 | Single-bus segmented double-arrangement transforming station bus replacing construction method |
| CN201600934U (en) * | 2009-11-04 | 2010-10-06 | 特变电工股份有限公司 | Strengthened core expanded diameter conductor |
Non-Patent Citations (4)
| Title |
|---|
| 万建成: "《架空导线应用技术》", 30 June 2015, 中国电力出版社 * |
| 刘丛爱: "《工农业变电所的控制与保护》", 30 November 1985 * |
| 刘春景: "采用垂直两分裂导线使线路的传输容量增加一倍", 《高电压技术》 * |
| 袁奇: "220kV双回路线路带电调换停电侧导线施工技术研究", 《工程科技II辑》 * |
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Application publication date: 20160127 |
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| RJ01 | Rejection of invention patent application after publication |