CN103812041B - Method for overhauling ring main unit of 10kV cable circuit without switching power supply off - Google Patents
Method for overhauling ring main unit of 10kV cable circuit without switching power supply off Download PDFInfo
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- CN103812041B CN103812041B CN201410059316.8A CN201410059316A CN103812041B CN 103812041 B CN103812041 B CN 103812041B CN 201410059316 A CN201410059316 A CN 201410059316A CN 103812041 B CN103812041 B CN 103812041B
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Abstract
The invention discloses a method for overhauling a ring main unit of a 10kV cable circuit without switching a power supply off. When a ring main unit between two ring main units needed to be repaired, a bypass system is built by using an original cable, and a power supply side circuit and a power transmission side circuit are communicated in sequence by using the built bypass system, thereby ensuring normal power supply and power transmission after the overhauled ring main unit exits from running and fulfilling the aim of overhauling without switching the power supply off. The bypass system is built by using the original cable, thereby reducing the pavement length of the bypass cable, reducing the investment of labor force and materials, and lowering the overhauling cost; non-power-off operation can be realized under the standby and non-standby interval situations of the ring main units on both sides of a bypass cable; under the non-standby interval situation of the ring main unit, the power-off overhauling times can be reduced effectively, and the power supply reliability is enhanced; the operation level is raised, the power supply reliability is improved, the loss of electric quality due to long-time power failure is reduced, and a remarkable economic benefit is achieved.
Description
Technical field
The present invention relates to a kind of 10kV cable run service without power-off ring main unit method.
Background technology
When certain ring main unit in loop network system break down or major defect time, realize not having a power failure often through cable bypath system or power failure connection in short-term two is sent a telegram here side ring main unit, the interim fault ring main unit that replaces is to feeder pillar and customer power supply.The committed step that bypass operation overhauls ring main unit (feeder pillar) between two ring main units utilizes bypass cable implement to carry out operation, adopts power failure mode in short-term to carry out for the situation without standby spacing.The principle signal of this operating type as shown in Figure 2.
The method of interruption maintenance ring main unit comprises the following steps in short-term:
Step 1, confirms that load current is less than bypath system rated current;
Step 2, disconnects the interval switch of Awaiting Overhaul ring main unit both sides, removes the cable termination that switch therewith connects;
Step 3, confirms that both sides switch disconnects;
Step 4, is connected to the switch of Awaiting Overhaul ring main unit both sides by the terminal at bypath system two ends;
Step 5, confirms that bypath system is consistent with original system phase sequence;
Step 6, power transmission side of closing switch;
Step 7, power side of closing switch, makes bypath system put into operation;
Step 8, monitors bypass cable electric current;
Step 9, implements and completes cable run maintenance;
Step 10, with reference to the operating sequence of 2-7, exits bypath system, recovers to have overhauled cable run and runs.
Existing repair method can complete maintenance task to bypass cable both sides ring main unit without standby spacing situation.But there is some following deficiency:
(1) set up bypath system, connect both sides ring main unit, need to lay comparatively long cable circuit, when laying bypass cable, need to drop into more manpower and materials, add the cost of overhaul, to the protect and manage workload also corresponding increase of cable run.
(2), because cable used in bypath system is longer, when passing by highway or densely populated place region, need to drop into more manpower and manage.Careless slightly, will cause major accident, the level of security of upkeep operation is not high.
(3) to not having the circuit of standby spacing switch to need interruption maintenance, reduce the reliability of power supply, unnecessary impact is caused on user;
(4) power failure brings the loss of electricity, reduces the satisfaction of user to enterprise.
Summary of the invention
The object of this invention is to provide a kind of 10kV cable run service without power-off ring main unit method of energy service without power-off ring main unit.
This 10kV cable run service without power-off ring main unit method provided by the invention, ring main unit, No. two ring main units to be repaired are connected successively with No. three ring main units, and the method comprises the steps:
Step 1, confirms that load current is less than bypath system rated current;
Described bypath system mainly comprises elbow-type joint one, elbow-type joint two, on-load switch one, on-load switch two, on-load switch three, T connector; One end of elbow-type joint one is connected with a described ring main unit, and its other end is connected with one end of on-load switch one, and the other end of on-load switch one is connected with an input of T connector; One end of elbow-type joint two is connected with described No. three ring main units, and its other end is connected with one end of on-load switch three, and the other end of on-load switch three is connected with another input of T connector; The output of T connector is connected with one end of on-load switch two, and the other end of this on-load switch two is connected with described No. two feeder pillars;
Step 2, disconnects a ring main unit power transmission side interval switch and No. two ring main unit power side interval to be repaired switches;
Step 3, disconnects the cable termination be connected with a ring main unit in No. two ring main units to be repaired, and is connected to elbow-type joint one;
Step 4, elbow-type joint one is connected with on-load switch one by flexible cable; On-load switch one is connected with T connector; T connector is connected with on-load switch two;
Step 5, determines that the distance of on-load switch two to No. two feeder pillars of being powered by described No. two ring main units to be repaired is within 50 meters;
Step 6, disconnects on-load switch one and on-load switch two, the cable termination be connected zero load is inserted in described No. two feeder pillars, and carry out nuclear phase to flexible cable with on-load switch two;
Step 7, closed load switch one and on-load switch two;
Step 8, disconnects in No. two ring main units to be repaired and interval switch that No. two feeder pillars are connected, removes spaced apartly with this to close the cable termination be connected, and No. two ring main units stoppings to be repaired being powered to No. two feeder pillars;
Step 9, disconnects No. three ring main unit power transmission side interval switches and No. two ring main unit power side interval to be repaired switches;
Step 10, disconnects the cable termination be connected with No. three ring main units in No. two ring main units to be repaired, and is connected to elbow-type joint two;
Step 11, is connected elbow-type joint two with on-load switch three by flexible cable; On-load switch three is connected with on-load switch two by described T connector;
Step 12, disconnects on-load switch three, and carries out nuclear phase to flexible cable;
Step 13, the interval switch of closed load switch three and No. three ring main units, No. two ring main units to be repaired are out of service;
Step 14, implements and completes No. two ring main unit maintenance to be repaired;
Step 15, with reference to step 2 to the operating sequence of step 13, removes bypath system, and recovers No. two ring main units to be repaired and put into operation.
The present invention overhauls ring main unit or feeder pillar between two ring main units to bypass operation, solve the deficiency in current methods: original cable 1, can be utilized to build bypath system, decrease and lay bypass cable length, decrease the input of man power and material, reduce the cost of overhaul; 2, have for subsequent use to bypass cable both sides ring main unit and can uninterrupted operation be realized without standby spacing situation; To ring main unit without standby spacing situation, can effectively reduce interruption maintenance number of times, improve power supply reliability; Improve level of operation, improve the reliability of power supply, reduce the electric quantity loss brought that has a power failure for a long time, remarkable in economical benefits.
Accompanying drawing explanation
Fig. 1 is embodiments of the present invention structural representations.
Fig. 2 is existing without power failure operation schematic diagram in short-term in standby spacing situation.
Detailed description of the invention
The present invention overhauls this key problem around ring main unit, according to " 10kV cable run uninterrupted operation fire protection technology ", on the basis of existing service technique, is optimized service technique and improves, realize the object of service without power-off ring main unit.
Some is not enough for now methodical, and the present invention is optimized existing repair method and improves; Particularly for the situation without standby spacing in those ring main units, be optimized and improve, realize also realizing service without power-off operation without standby spacing.
Consider and need to lay longer cable when setting up bypath system, the present invention is optimized design to bypath system, utilizes the original cable of part to build bypath system.
As shown in Figure 1, No. 2 ring main units to be repaired are band maintenance ring main unit.Bypath system cable run connects No. 1 ring main unit, is arranging cable run, then connect 3 ring net cabinet near No. 2 ring main units to be repaired.By-pass line, near No. 2 ring main units to be repaired, decreases cabling length.In addition, so also facilitate and bypath system circuit is managed, decrease the input of man power and material, reduce the cost of overhaul.
In Fig. 1 dotted line position be No. 2 ring main units to be repaired before building bypath system with original wiring of No. 1 ring main unit, 3 ring net cabinet and No. 2 feeder pillars.
According to the requirement of " 10kV cable run uninterrupted operation fire protection technology ", with can the flexible cable length that is connected of charged plug bypass cable terminal should more than 50m.Therefore in order to also realize uninterrupted operation to the ring main unit overhauled without standby spacing switch, can by increasing on-load switch 2, and within making the distance between on-load switch 2 and feeder pillar 2 keep 50m, make the cable termination be connected with on-load switch 2 can realize unloaded insertion in feeder pillar like this.When on-load switch 1 and on-load switch 2 close, No. 1 ring main unit can be realized power to feeder pillar 2, disconnect the cable termination be connected with No. 2 ring main units to be repaired afterwards again, realize not having a power failure to the maintenance of No. 2 ring main units to be repaired, thus improve the reliability of power supply, reduce economic loss.
Based on above-mentioned principle, concrete steps of the present invention are as follows.
Step 1, confirms that load current is less than bypath system rated current;
Step 2, disconnects No. 1 ring main unit power transmission side interval switch and No. 2 ring main unit power side interval to be repaired switches;
Step 3, disconnects the cable termination be connected with No. 1 ring main unit in No. 2 ring main units to be repaired;
Step 4, will be drawn by No. 1 ring main unit and the cable termination be originally connected with No. 2 ring main units to be repaired is connected to elbow-type joint 1;
Step 5, elbow-type joint 1 is connected with on-load switch 1 by flexible cable; On-load switch 1 is connected with T connector; T connector is connected with on-load switch 2;
Step 6, determines that the distance of on-load switch 2 to No. 2 feeder pillars of being powered by described No. 2 ring main units to be repaired is within 50 meters;
Step 7, disconnects on-load switch 1 and on-load switch 2, the cable termination be connected zero load is inserted in described No. 2 feeder pillars, and carry out nuclear phase to cable with on-load switch 2;
Step 8, closed load switch 1 and on-load switch 2;
Step 9, disconnects in No. 2 ring main units to be repaired and interval switch that No. 2 feeder pillars are connected, removes spaced apartly with this to close the cable termination be connected, and No. 2 ring main units stoppings to be repaired being powered to No. 2 feeder pillars;
Step 10, disconnects 3 ring net cabinet power transmission side interval switch and No. 2 ring main unit power side interval to be repaired switches;
Step 11, disconnects the cable termination be connected with 3 ring net cabinet in No. 2 ring main units to be repaired;
Step 12, is connected to elbow-type joint 2 by the original cable termination be connected with No. 2 ring main units to be repaired of being drawn by 3 ring net cabinet,
Step 13, is connected elbow-type joint 2 with on-load switch 3 by flexible cable; On-load switch 3 is connected with on-load switch 2 by described T connector;
Step 14, disconnects on-load switch 3, and carries out nuclear phase to cable;
Step 15, the interval switch of closed load switch 3 and 3 ring net cabinet, No. 2 ring main units to be repaired are out of service;
Step 16, implements and completes No. 2 ring main unit maintenance to be repaired;
Step 17, with reference to step 2 to the operating sequence of step 15, removes bypath system, and recovers No. 2 ring main units to be repaired and put into operation.
The bypath system that final the present invention utilizes original cable to build comprises elbow-type joint 1, elbow-type joint 2, on-load switch 1, on-load switch 2, on-load switch 3, T connector.The original cable adopted comprises: the cable be connected with No. 1 ring main unit in No. 2 ring main units to be repaired; The cable be connected with 3 ring net cabinet in No. 2 ring main units to be repaired.
The direct economic benefit brought by the present invention is: avoid power failure to calculate for 1 hour by every subjob, line load is 1.6 ten thousand kilowatts, and the present invention carries out one-stop operation can reduce loss of outage electricity 1.6 ten thousand kilowatt hour.Be that 0.633 yuan/kw.h calculates with electricity price, direct economic benefit estimates each about 1.01 ten thousand yuan; Its Economic and Efficiency Analysis is specifically as shown in table 1.
Table 1: Economic and Efficiency Analysis list
Note: electricity price calculates by 0.633 yuan/kw.h.
Claims (1)
1. a 10kV cable run service without power-off ring main unit method, ring main unit, No. two ring main units to be repaired are connected successively with No. three ring main units, and the method comprises the steps:
Step 1, confirms that load current is less than bypath system rated current;
Described bypath system mainly comprises elbow-type joint one, elbow-type joint two, on-load switch one, on-load switch two, on-load switch three, T connector; One end of elbow-type joint one is connected with a described ring main unit, and its other end is connected with one end of on-load switch one, and the other end of on-load switch one is connected with an input of T connector; One end of elbow-type joint two is connected with described No. three ring main units, and its other end is connected with one end of on-load switch three, and the other end of on-load switch three is connected with another input of T connector; The output of T connector is connected with one end of on-load switch two, and the other end of this on-load switch two is connected with described No. two feeder pillars;
Step 2, disconnects a ring main unit power transmission side interval switch and No. two ring main unit power side interval to be repaired switches;
Step 3, disconnects the cable termination be connected with a ring main unit in No. two ring main units to be repaired, and is connected to elbow-type joint one;
Step 4, elbow-type joint one is connected with on-load switch one by flexible cable; On-load switch one is connected with T connector; T connector is connected with on-load switch two;
Step 5, determines that the distance of on-load switch two to No. two feeder pillars of being powered by described No. two ring main units to be repaired is within 50 meters;
Step 6, disconnects on-load switch one and on-load switch two, the cable termination be connected zero load is inserted in described No. two feeder pillars, and carry out nuclear phase to flexible cable with on-load switch two;
Step 7, closed load switch one and on-load switch two;
Step 8, disconnects in No. two ring main units to be repaired and interval switch that No. two feeder pillars are connected, removes spaced apartly with this to close the cable termination be connected, and No. two ring main units stoppings to be repaired being powered to No. two feeder pillars;
Step 9, disconnects No. three ring main unit power transmission side interval switches and No. two ring main unit power side interval to be repaired switches;
Step 10, disconnects the cable termination be connected with No. three ring main units in No. two ring main units to be repaired, and is connected to elbow-type joint two;
Step 11, is connected elbow-type joint two with on-load switch three by flexible cable; On-load switch three is connected with on-load switch two by described T connector;
Step 12, disconnects on-load switch three, and carries out nuclear phase to flexible cable;
Step 13, the interval switch of closed load switch three and No. three ring main units, No. two ring main units to be repaired are out of service;
Step 14, implements and completes No. two ring main unit maintenance to be repaired;
Step 15, with reference to step 2 to the operating sequence of step 13, removes bypath system, and recovers No. two ring main units to be repaired and put into operation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410059316.8A CN103812041B (en) | 2014-02-21 | 2014-02-21 | Method for overhauling ring main unit of 10kV cable circuit without switching power supply off |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410059316.8A CN103812041B (en) | 2014-02-21 | 2014-02-21 | Method for overhauling ring main unit of 10kV cable circuit without switching power supply off |
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| CN103812041A CN103812041A (en) | 2014-05-21 |
| CN103812041B true CN103812041B (en) | 2015-03-25 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105098648A (en) * | 2015-08-24 | 2015-11-25 | 国网天津市电力公司 | Short-time power-cut operation method for cable line between two ring main units |
| CN105374582B (en) * | 2015-12-24 | 2017-08-25 | 国家电网公司 | Networking connection method for the next secondary device of power network |
| CN109462276A (en) * | 2018-08-07 | 2019-03-12 | 国网浙江省电力有限公司衢州供电公司 | Seamless electricity connection method |
| CN109546577A (en) * | 2019-01-23 | 2019-03-29 | 浙江华仪电器科技有限公司 | A kind of uninterrupted operation maintenance auxiliary switch assembly and power grid service without power-off method |
| CN109546578A (en) * | 2019-01-23 | 2019-03-29 | 浙江华仪电器科技有限公司 | A kind of uninterrupted operation maintenance auxiliary switch assembly and power grid service without power-off method |
| CN111342447A (en) * | 2020-03-02 | 2020-06-26 | 国网湖北省电力有限公司宜昌供电公司 | Application of novel bypass cable operation in distribution network line ring main unit |
| CN111181063B (en) * | 2020-03-02 | 2021-09-10 | 国网湖北省电力有限公司宜昌供电公司 | Novel bypass cable operation method applied to ring main unit of distribution network line |
| CN113346409A (en) * | 2021-07-14 | 2021-09-03 | 国网河南省电力公司平顶山供电公司 | Uninterrupted power operation method for load transfer maintenance of 10kV outgoing line interval of transformer substation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5041911B2 (en) * | 2007-08-10 | 2012-10-03 | 中国電力株式会社 | Plug extraction tool |
| CN103050892A (en) * | 2012-12-28 | 2013-04-17 | 上海市电力公司 | Uninterruptible-operated bypass connection device applied between European ring main unit and American type ring main unit |
| CN103078268A (en) * | 2012-12-28 | 2013-05-01 | 上海市电力公司 | Uninterrupted power overhauling method of 10kV cables between two annular net cabinets |
| CN103036160A (en) * | 2012-12-28 | 2013-04-10 | 广州供电局有限公司 | Extensible type ring main unit with no-break power supply on two sides |
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Owner name: LIVE WORKING CENTER OF STATE GRID HUNAN ELECTRIC P Effective date: 20150421 Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER OWNER: LIVE WORKING CENTER OF STATE GRID HUNAN ELECTRIC POWER COMPANY Effective date: 20150421 |
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Inventor after: Zou Dehua Inventor after: Tang Li Inventor after: Zheng Kequan Inventor after: Liu Xiaqing Inventor after: Ren Chengxian Inventor after: Niu Jie Inventor after: Zhang Jianjun Inventor after: Liu Tuocheng Inventor after: Ou Naicheng Inventor after: Guo Hao Inventor after: Jiang Li Inventor before: Liu Xiaqing Inventor before: Zheng Kequan Inventor before: Zou Dehua Inventor before: Niu Jie Inventor before: Zhang Jianjun Inventor before: Liu Tuocheng Inventor before: Ou Naicheng Inventor before: Guo Hao Inventor before: Jiang Li Inventor before: Tang Li |
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Free format text: CORRECT: ADDRESS; FROM: 410100 CHANGSHA, HUNAN PROVINCE TO: 100031 XICHENG, BEIJING Free format text: CORRECT: INVENTOR; FROM: LIU XIAQING ZOU DEHUA NIU JIE ZHANG JIANJUN LIU TUOSHENG OU NAICHENG GUO HAO JIANG LI TANG LI ZHENG KEQUAN TO: ZOU DEHUA LIU XIAQING REN CHENGXIAN NIU JIE ZHANG JIANJUN LIU TUOSHENG OU NAICHENG GUO HAO JIANG LI TANG LI ZHENG KEQUAN |
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Effective date of registration: 20150421 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: Guo Wang Hunan Province Utilities Electric Co. live line working center Patentee after: State Grid Hunan Electric Power Company Address before: 410100 Hunan province Changsha City Economic Development Zone Li Xiang Road No. 8 Patentee before: Guo Wang Hunan Province Utilities Electric Co. live line working center |