CN103812041A - 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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- CN103812041A CN103812041A CN201410059316.8A CN201410059316A CN103812041A CN 103812041 A CN103812041 A CN 103812041A CN 201410059316 A CN201410059316 A CN 201410059316A CN 103812041 A CN103812041 A CN 103812041A
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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 line service without power-off ring main unit method.
Background technology
When certain ring main unit in loop network system breaks down or when major defect, often realize not having a power failure or having a power failure in short-term by cable bypath system connecting two incoming call side ring main units, replace fault ring main unit to feeder pillar and customer power supply temporarily.The committed step that bypass operation overhauls ring main unit between two ring main units (feeder pillar) is to utilize bypass cable implement to carry out operation, for adopt power failure mode in short-term to carry out without the situation of standby spacing.The principle of this operating type is illustrated 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 4, is connected to the terminal at bypath system two ends on the switch of Awaiting Overhaul ring main unit both sides;
Step 10, with reference to the operating sequence of 2-7, exits bypath system, recovers to have overhauled cable line operation.
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 compared with long cable circuit, while laying bypass cable, need to drop into more manpower and materials, increased the cost of overhaul, the protection to cable line and management workload be corresponding increase also.
(2), because cable used in bypath system is longer, while passing by highway or personnel's close quarters, need to drop into more manpower and manage.Careless slightly, will cause serious accident, the lsafety level of upkeep operation is not high.
(3) circuit that there is no standby spacing switch is needed to interruption maintenance, reduced the reliability of power supply, user is caused to unnecessary impact;
(4) loss that has a power failure and brought electric weight, has reduced the satisfaction of user to enterprise.
Summary of the invention
The object of this invention is to provide a kind of 10kV cable line service without power-off ring main unit method of energy service without power-off ring main unit.
This 10kV cable line service without power-off ring main unit method provided by the invention, the method comprises the steps:
Step 1, confirms that load current is less than bypath system rated current;
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 10, disconnects in No. two ring main units to be repaired the cable termination being connected with No. three ring main units, and is connected to elbow type joint two;
Step 11, is connected by flexible cable elbow type joint two with on-load switch three; On-load switch three is connected with on-load switch two by described T connector;
Step 12, disconnects on-load switch three, and cable is carried out to nuclear phase;
Step 13, the interval switch of three and No. three ring main units of closed load switch, No. two ring main unit to be repaired is out of service;
Step 14, implements and completes No. two ring main unit maintenance to be repaired;
Step 15, the operating sequence with reference to step 2 to step 13, removes bypath system, and recovers No. two ring main units to be repaired and put into operation.
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.
The present invention overhauls ring main unit or feeder pillar between two ring main units to bypass operation, solve the deficiency in current methods: 1, can utilize original cable to build bypath system, reduce and laid bypass cable length, reduced man power and material's input, reduced the cost of overhaul; 2, bypass cable both sides ring main unit is had for subsequent use and can realize uninterrupted operation without standby spacing situation; Without standby spacing situation, can effectively reduce interruption maintenance number of times to ring main unit, improve power supply reliability; Promote level of operation, improved the reliability of power supply, reduced the long-time electric quantity loss that has a power failure and bring, 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.
Embodiment
The present invention overhauls this key problem around ring main unit, according to " 10kV cable line uninterrupted operation technology guide rule ", on the basis of existing service technique, service technique is optimized and is improved, and realizes the object of service without power-off ring main unit.
For existing methodical some deficiency, the present invention is optimized and improves existing repair method; Particularly, for the situation without standby spacing in those ring main units, be optimized and improve, realize and also can realize service without power-off operation without standby spacing.
Consider while setting up bypath system and need to lay longer cable, 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 line connects No. 1 ring main unit, is arranging cable line, then connect 3 ring net cabinet apart near No. 2 ring main units to be repaired.By-pass line, near No. 2 ring main units to be repaired, has reduced cabling length.In addition, so also facilitate bypath system circuit is managed, reduced man power and material's input, reduced the cost of overhaul.
In Fig. 1, dotted line position is No. 2 ring main units to be repaired building before bypath system and original wiring of No. 1 ring main unit, 3 ring net cabinet and No. 2 feeder pillars.
According to the requirement of " 10kV cable line uninterrupted operation technology guide rule ", should not exceed 50m with the flexible cable length can charged plug bypass cable terminal being connected.Therefore for maintenance is also realized to uninterrupted operation without the ring main unit of standby spacing switch, can be by increasing on-load switch 2, and the distance between on-load switch 2 and feeder pillar 2 is kept in 50m, make like this cable termination being connected with on-load switch 2 can realize unloaded insertion in feeder pillar.In the time of on-load switch 1 and on-load switch 2 closure, can realize No. 1 ring main unit feeder pillar 2 is powered, disconnect again afterwards the cable termination being connected with No. 2 ring main units to be repaired, the maintenance that realization does not have a power failure to No. 2 ring main units to be repaired, thereby the reliability that has improved power supply, reduces 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 4, is connected to elbow type joint 1 by the cable termination of being drawn by No. 1 ring main unit and be originally connected with No. 2 ring main units to be repaired;
Step 10, disconnects 3 ring net cabinet power transmission side interval switch and No. 2 ring main unit power side to be repaired interval switches;
Step 11, disconnects the cable termination being 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 cable termination being originally connected with No. 2 ring main units to be repaired of being drawn by 3 ring net cabinet,
Step 13, is connected by flexible cable elbow type joint 2 with on-load switch 3; On-load switch 3 is connected with on-load switch 2 by described T connector;
Step 14, disconnects on-load switch 3, and cable is carried out to nuclear phase;
Step 15, the interval switch of closed load switch 3 and 3 ring net cabinet, No. 2 ring main unit to be repaired is out of service;
Step 16, implements and completes No. 2 ring main unit maintenance to be repaired;
Step 17, the operating sequence with reference to step 2 to 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 adopting comprises: the cable being connected with No. 1 ring main unit in No. 2 ring main units to be repaired; The cable being connected with 3 ring net cabinet in No. 2 ring main units to be repaired.
The direct economic benefit being brought by the present invention is: avoid having a power failure 1 hour by every subjob and calculate, line load is 1.6 ten thousand kilowatts, and the present invention carries out one-stop operation can reduce loss of outage electric weight 1.6 ten thousand kilowatt hours.Calculate take electricity price as 0.633 yuan/kw.h, direct economic benefit is estimated each approximately 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 is calculated by 0.633 yuan/kw.h.
Claims (2)
1. a 10kV cable line service without power-off ring main unit method, the method comprises the steps:
Step 1, confirms that load current is less than bypath system rated current;
Step 2, disconnects a ring main unit power transmission side interval switch and No. two ring main unit power side to be repaired interval switches;
Step 3, disconnects in No. two ring main units to be repaired the cable termination being connected with ring main unit, 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, determine on-load switch two to the distance of No. two feeder pillars by described No. two ring main units to be repaired power supply in 50 meters;
Step 6, disconnects on-load switch one and on-load switch two, inserts in described No. two feeder pillars, and cable is carried out to nuclear phase by unloaded the cable termination being connected 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 the interval switch being connected with No. two feeder pillars, removes the cable termination being connected with this spaced apart pass, makes No. two ring main units to be repaired stop No. two feeder pillars to power;
Step 9, disconnects No. three ring main unit power transmission side interval switches and No. two ring main unit power side to be repaired interval switches;
Step 10, disconnects in No. two ring main units to be repaired the cable termination being connected with No. three ring main units, and is connected to elbow type joint two;
Step 11, is connected by flexible cable elbow type joint two with on-load switch three; On-load switch three is connected with on-load switch two by described T connector;
Step 12, disconnects on-load switch three, and cable is carried out to nuclear phase;
Step 13, the interval switch of three and No. three ring main units of closed load switch, No. two ring main unit to be repaired is out of service;
Step 14, implements and completes No. two ring main unit maintenance to be repaired;
Step 15, the operating sequence with reference to step 2 to step 13, removes bypath system, and recovers No. two ring main units to be repaired and put into operation.
2. 10kV cable line service without power-off ring main unit method according to claim 1, is characterized in that, 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.
Priority Applications (1)
| 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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| 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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| CN103812041B CN103812041B (en) | 2015-03-25 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105374582A (en) * | 2015-12-24 | 2016-03-02 | 国家电网公司 | Network access connection method for next-time grid equipment and hand switch |
| 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 |
| CN111181063A (en) * | 2020-03-02 | 2020-05-19 | 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 |
| 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 |
| 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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| 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 |
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| JP2009044919A (en) * | 2007-08-10 | 2009-02-26 | Chugoku Electric Power Co Inc:The | Plug drawing-out tool |
| 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 |
| 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 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105374582A (en) * | 2015-12-24 | 2016-03-02 | 国家电网公司 | Network access connection method for next-time grid equipment and hand switch |
| 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 |
| CN111181063A (en) * | 2020-03-02 | 2020-05-19 | 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 |
| 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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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 |