CN103560512A - High-reliability closed loop wiring method of medium voltage distribution network - Google Patents
High-reliability closed loop wiring method of medium voltage distribution network Download PDFInfo
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Abstract
本发明涉及一种中压配电网高可靠性闭环接线方法，其特征在于包括以下步骤：步骤S01：将变电站的每台变压器的10千伏侧引出独立的两段母线；步骤S02：将所述两段母线各自经一环网单元连接，以形成闭环环网结构，所述环网单元中至少设置一个断路器作为联络开关，每台变压器所形成的闭环环网结构均通过该联络开关和联络线连接到另一台变压器所形成的闭环环网结构上；变压器正常运行时联络线两端的断路器均打开，联络线处于备用状态；而且每个环网上供电的负荷不超过两回馈线热稳定极限供电负荷的40％。本发明方法的优点在于，供电可靠性高，同一变压器的闭环运行不会提高配电网短路电流，因此改造量小，建设成本低，可行性高。
The invention relates to a high-reliability closed-loop wiring method for a medium-voltage distribution network, which is characterized in that it includes the following steps: step S01: lead out two independent busbars from the 10 kV side of each transformer in the substation; step S02: connect the The two sections of bus bars are respectively connected by a ring network unit to form a closed-loop ring network structure. At least one circuit breaker is arranged in the ring network unit as a tie switch, and the closed-loop ring network structure formed by each transformer passes through the tie switch and The tie line is connected to the closed-loop ring network structure formed by another transformer; when the transformer is in normal operation, the circuit breakers at both ends of the tie line are turned on, and the tie line is in a standby state; and the power supply load on each ring network does not exceed two feeder lines. 40% of the stable limit power supply load. The method of the invention has the advantages of high power supply reliability, and the closed-loop operation of the same transformer will not increase the short-circuit current of the distribution network, so the transformation amount is small, the construction cost is low, and the feasibility is high.
Description
Technical field
The present invention relates to power supply technique field, particularly a kind of medium voltage distribution network high reliability closed loop mode of connection.
Background technology
Both at home and abroad the medium voltage distribution network of high reliability service area generally adopts ring network structure, and its operational mode is divided into two kinds of open loop operation and operation with closed ring.In China, press 10 KV distribution nets to adopt " open loop operation+power distribution automation " mode, the interconnection switch while normally moving between each 10 kilovolts of feeder lines is opened, and 10 kilovolts of feeder lines adopt radiation type electric supply; After feeder fault, by electrical power distribution automatization system, implement fault location and isolation, by the closed power supply realizing to non-faulty section of interconnection switch, its shortcoming is that the time restoring electricity after fault is longer, needs a few minutes～dozens of minutes.The middle pressure 20 KV distribution nets in the area such as Singapore, Hong Kong adopt the mode of " operation with closed ring+differential protection ", while normally moving, between twice 10 kilovolts of feeder lines, by equipment such as circuit breakers, are connected, and form looped network; After feeder fault, by relay protection device, implement rapidly fault location and isolation, only need tens～hundreds of millisecond.Compare with open loop operational mode, operation with closed ring advantage is that the time restoring electricity after fault is short, and shortcoming is that short-circuit current value is large, and construction cost is high.
Yet, in the areas such as Singapore, Hong Kong, to press in the operation with closed ring mode that 20 KV distribution nets adopt, twice 20 kilovolts of feeder lines are from 20 kilovolts of buses of different transformers.The in the situation that of same capacity of short circuit, 10 KV distribution net short circuit currents are 2 times of 20 KV distribution nets.If this Connection Mode is applied directly in the 10 KV distribution nets of China, the short circuit current of China's 10 KV distribution nets will significantly surpass the rated value (being generally 25 kilo-amperes or 31.5 kilo-amperes) of existing device, need to transform in a large number, not only investment is large, but also may during transforming, affect user's normal power supply.
Summary of the invention
The object of this invention is to provide a kind of medium voltage distribution network high reliability closed loop mode of connection, the operation with closed ring that can realize same transformer can not improve power distribution network short circuit current.
The present invention adopts following scheme to realize: a kind of medium voltage distribution network high reliability closed loop mode of connection, is characterized in that comprising the following steps:
Step S01: 10 kilovolts of sides of every transformer of transformer station are drawn to independently two sections of buses;
Step S02: described two sections of buses ring-main unit of respectively hanging oneself is connected, to form closed loop ring network structure, a circuit breaker is at least set as interconnection switch in described ring-main unit, every formed closed loop ring network structure of transformer is all connected on the formed closed loop ring network structure of another transformer by this interconnection switch and interconnection; When transformer normally moves, the circuit breaker at interconnection two ends is all opened, and interconnection is in stand-by state; And the load of powering on each looped network is no more than 40% of the thermally-stabilised limit supply load of two feedback line.
In an embodiment of the present invention, when the equal fault of two feedback line of certain looped network is stopped transport, network interconnecting circuit is closed, and interconnection transfers running status to by stand-by state; Load on fault feeder is powered by interconnection by non-fault looped network.
In an embodiment of the present invention, on described circuit breaker, configure differential type relaying protection.
The inventive method adopts the mode of " operation with closed ring+differential protection " to be applied to 10 KV distribution nets, after a feedback line fault, by relay protection device, implements rapidly fault location and isolation, fast recovery of power supply; After two feedback line faults, by interconnection, realize support, fast recovery of power supply.Be suitable for the service area higher to reliability requirement.In this method, form two feeder lines of looped network from the different buses of same transformer, only have a transformer to provide short circuit current to looped network, short circuit current level and conventional open loop operational mode do not have difference.
Accompanying drawing explanation
Fig. 1 is the 10kV of the transformer station feeder line closed loop wiring schematic diagram (being this Connection Mode in dotted line frame) of three main transformers.
Fig. 2 is after single time 10kV feeder line breaks down, the state variation schematic diagram of both sides, fault point circuit breaker.
Fig. 3 is after the double back 10kV feeder line of same transformer breaks down, the state variation schematic diagram of both sides, fault point circuit breaker and interconnection circuit breaker.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
The present embodiment is to provide a kind of medium voltage distribution network high reliability closed loop mode of connection, it is characterized in that comprising the following steps:
Step S01: 10 kilovolts of sides of every transformer of transformer station are drawn to independently two sections of buses;
Step S02: described two sections of buses ring-main unit of respectively hanging oneself is connected, to form closed loop ring network structure, a circuit breaker is at least set as interconnection switch in described ring-main unit, every formed closed loop ring network structure of transformer is all connected on the formed closed loop ring network structure of another transformer by this interconnection switch and interconnection; When transformer normally moves, the circuit breaker at interconnection two ends is all opened, and interconnection is in stand-by state; And the load of powering on each looped network is no more than 40% of the thermally-stabilised limit supply load of two feedback line.
Please refer to accompanying drawing 1, Fig. 2 and Fig. 3, in the present embodiment, in transformer station, there are three main transformers, it is respectively main transformer 1, main transformer 2 and main transformer 3, every main transformer has all formed a closed loop ring network structure, take main transformer 1 as example, its 10 kilovolts of sides are drawn independently two sections of buses, be respectively bus 11 and bus 12, every section of bus feeds out 10 kilovolts of feeder lines one time, correspond to respectively feeder line 11 and feeder line 12, wherein feeder line 11 connects two ring-main unit HW11 and HW12 by circuit breaker 11, and feeder line 12 connects two ring-main unit HW14 and HW13 by circuit breaker 12, finally be connected to form closed loop ring network structure.Described ring-main unit or be power distribution station, or be ring main unit, or be switchyard, the inside of each ring-main unit adopts circuit breaker as connection element.Differential protection (not shown in the figures meaning out, it can adopt existing commercially available differential protection) is installed in every formed closed loop ring network structure of transformer.Under normal operating condition, the load of powering on each closed loop ring network structure is no more than 40% of the thermally-stabilised limit supply load of two feedback line.
In the closed loop ring network structure of main transformer 1, ring-main unit HW13 is provided with interconnection switch, and it is connected in the closed loop ring network structure of main transformer 2 by interconnection 12.In figure, solid massive structure is the circuit breaker of the lower closure state of normal operation, and hollow massive structure is the circuit breaker of the lower open mode of normal operation.
Equally, bus 21 and bus 22 be all from 10 kilovolts of sides of main transformer 2, and bus 31 and bus 32 are all from 10 kilovolts of sides of main transformer 3.HW11 in figure, HW12 ... HW33, HW34 represent that ring main unit, power distribution station (chamber) etc. can form the connection unit of looped network, and each connection unit is inner adopts 10 kilovolts of circuit breakers as connecting device.Connection unit is connected with power load by closed circuit breaker, and transformer station powers to power load through feeder line and looped network connection unit.The connection unit of the closed looped network inside that interconnection 12 is different with interconnection 23 connections, when normal, the circuit breaker of interconnection both sides is all in off-state, and interconnection does not have UNICOM, in stand-by state.
For example, when any feeder line (feeder line 11) breaks down, according to sequential, there is following action:
Differential protection detects fault; Send action command, the circuit breaker of both sides, fault point is opened (for example the circuit breaker A in circuit breaker 11 and looped network HW11 opens), and the part of path breaking down on feeder line 11 is isolated; Load on HW11, HW12, HW13, HW14 is all powered by feeder line 12.
For example, when two feeder lines from same transformer (feeder line 11 and feeder line 12) break down, according to sequential, there is following action:
Differential protection detects fault; Send action command, the circuit breaker of both sides, fault point is opened (for example the circuit breaker A in circuit breaker 11 and looped network HW11 opens, and the circuit breaker B in circuit breaker 12 and looped network HW14 opens), and the part of path breaking down on feeder line 11, feeder line 12 is isolated; The breaker closing of interconnection 12 both sides, interconnection 12 transfers running status to by stand-by state.Load on HW11, HW12, HW13, HW14 is all by feeder line 21 and feeder line 22 power supplies.
The above main transformer can be the main transformer of 220 kv substations or 110 kv substations, but the low-pressure side of transformer is 10 kilovolts.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
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Cited By (6)
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| CN105207265A (en) * | 2015-10-23 | 2015-12-30 | 国网福建省电力有限公司 | Method for realizing power distribution network closed loop and photovoltaic concentrated access by adopting flexible DC (direct current) power transmission |
| CN105914734A (en) * | 2016-04-22 | 2016-08-31 | 国网天津市电力公司 | Differentiated power distribution network fault processing complementary method based on special operation mode |
| CN106877317A (en) * | 2017-03-23 | 2017-06-20 | 天津大学 | Definition, networking form, operation mode and transition method of flexible distribution network |
| CN109088409A (en) * | 2018-09-27 | 2018-12-25 | 广州供电局有限公司 | Power distribution network wiring construction |
| CN114725941A (en) * | 2022-06-09 | 2022-07-08 | 沈阳易鑫泰电力科技有限公司 | Rural overhead power distribution network frame reconstruction system and automatic reconstruction method |
| CN112510706B (en) * | 2020-12-04 | 2023-06-27 | 深圳供电局有限公司 | Same-mother loop closing circuit for 10kV power distribution network |
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| CN105762921B (en) * | 2016-01-27 | 2018-03-13 | 江苏省电力公司南京供电公司 | A kind of cyclization of based superconductive current limiter turns method of supplying power to |
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2013
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207265A (en) * | 2015-10-23 | 2015-12-30 | 国网福建省电力有限公司 | Method for realizing power distribution network closed loop and photovoltaic concentrated access by adopting flexible DC (direct current) power transmission |
| CN105914734A (en) * | 2016-04-22 | 2016-08-31 | 国网天津市电力公司 | Differentiated power distribution network fault processing complementary method based on special operation mode |
| CN106877317A (en) * | 2017-03-23 | 2017-06-20 | 天津大学 | Definition, networking form, operation mode and transition method of flexible distribution network |
| CN106877317B (en) * | 2017-03-23 | 2019-04-23 | 天津大学 | Definition, Network Form, Operation Mode and Transition Method of Flexible Distribution Network |
| CN109088409A (en) * | 2018-09-27 | 2018-12-25 | 广州供电局有限公司 | Power distribution network wiring construction |
| CN109088409B (en) * | 2018-09-27 | 2021-06-04 | 广东电网有限责任公司广州供电局 | Distribution network wiring structure |
| CN112510706B (en) * | 2020-12-04 | 2023-06-27 | 深圳供电局有限公司 | Same-mother loop closing circuit for 10kV power distribution network |
| CN114725941A (en) * | 2022-06-09 | 2022-07-08 | 沈阳易鑫泰电力科技有限公司 | Rural overhead power distribution network frame reconstruction system and automatic reconstruction method |
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