CN103545807A - Medium voltage distribution network two wire closed loop operation wire connecting method - Google Patents
Medium voltage distribution network two wire closed loop operation wire connecting method Download PDFInfo
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- CN103545807A CN103545807A CN201310452364.9A CN201310452364A CN103545807A CN 103545807 A CN103545807 A CN 103545807A CN 201310452364 A CN201310452364 A CN 201310452364A CN 103545807 A CN103545807 A CN 103545807A
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Abstract
The invention discloses a medium voltage distribution network two wire closed loop operation wire connecting method comprising a first transformer substation and a second transformer substation. The medium voltage distribution network two wire closed loop operation wire connecting method is characterized in that the first transformer substation comprises a first main transformer and a second main transformer which are operated in parallel, a third main transformer and a fourth main transformer which are operated in parallel; the second transformer substation comprises a fifth main transformer, a sixth main transformer, and a seventh main transformer and an eighth main transformer which are operated in parallel; circuits from buses of two main transformer operated in parallel are connected with each other to form closed loop units. Transferring capacity between the closed loop units in the medium voltage distribution network can be flexibly configured according to power supplying reliability, flow distribution is simple and easy to be controlled, longitudinal differential protection is adopted in the medium voltage distribution network, so that N-1 is generated in the medium voltage distribution network and fault points can be rapidly separated to restore power supplement during the fault, and an equipped automatic system can be utilized to realize intelligentialization of switching operation, so that the switching operation can be utilized to restore power supplement during N-1-1 and N-2 faults; the medium voltage distribution network two wire closed loop operation wire connecting method is simple in structure and convenient to operate and implement.
Description
[technical field]
The present invention relates to a kind of medium voltage distribution network two wires cyclization mode of connection.
[background technology]
For meeting the electricity consumption reliability requirement that user is more and more higher, medium voltage distribution network has developed numerous modes of connection, according to the difference of operational mode, can be divided into substantially open loop mode of operation and cyclization operational mode, wherein cyclization operational mode is used the cyclization mode of connection that has Singapore's petal mode of connection, the employing of Hong Kong Zhonghua Electrical Co., Ltd. of comparative maturity etc., but the above-mentioned cyclization mode of connection remains in some defects or deficiency:
There is the uneven problem for limited ability that causes turning between cyclization unit because trend distributes in the Singapore petal mode of connection;
There is equally the problem that turns confession limited ability between cyclization unit in the cyclization mode of connection that Hong Kong Zhonghua Electrical Co., Ltd. adopts, and under cyclization unit " N-1 " fault and normal operation, lock into equally the unbalanced problem of trend, cause cyclization unit actual loading rate and theoretical maximum load rate to have larger difference.
For meeting part, power supply reliability is required to the need for electricity in high region, be necessary the existing closed loop network mode of connection to improve, design a kind of novel cyclization mode of connection.
[summary of the invention]
In order to overcome the deficiencies in the prior art, the invention provides a kind of medium voltage distribution network two wires cyclization mode of connection.
Technical solution of the present invention is as described below: a kind of medium voltage distribution network two wires cyclization mode of connection, and comprise and it is characterized in that the first transformer station and second transformer station of two parallel runnings,
Described the first transformer station comprises the first main transformer, the second main transformer, the 3rd main transformer and the 4th main transformer, and adopt single busbar connection four section wiring modes in low-pressure side, wherein said the first main transformer and described the second main transformer paired running, the bus section of described the first main transformer is connected by a normally closed switch with the bus section of described the second main transformer, described the 3rd main transformer and described the 4th main transformer paired running, the bus section of described the 3rd main transformer is connected by a normally closed switch with the bus section of described the 4th main transformer, the bus section of described the second main transformer is connected by a normal open switch with the bus section of described the 3rd main transformer, the bus section of the bus section of described the first main transformer and described the second main transformer respectively separates a circuit, these two link testers are crossed a normally closed switch and are interconnected to constitute the first cyclization unit, the bus section of the bus section of described the 3rd main transformer and described the 4th main transformer respectively separates a circuit, these two link testers are crossed a normally closed switch and are interconnected to constitute the second cyclization unit,
Described the second transformer station comprises the 5th main transformer, the 6th main transformer, the 7th main transformer and the 8th main transformer, and adopt single busbar connection four section wiring modes in low-pressure side, wherein said the 5th main transformer and described the 6th main transformer paired running, the bus section of described the 5th main transformer is connected by a normally closed switch with the bus section of described the 6th main transformer, described the 7th main transformer and described the 8th main transformer paired running, the bus section of described the 7th main transformer is connected by a normally closed switch with the bus section of described the 8th main transformer, the bus section of described the 6th main transformer is connected by a normal open switch with the bus section of described the 7th main transformer, the bus section of the bus section of described the 5th main transformer and described the 6th main transformer respectively separates a circuit, these two link testers are crossed a normally closed switch and are interconnected to constitute the 3rd cyclization unit, the bus section of the bus section of described the 7th main transformer and described the 8th main transformer respectively separates a circuit, these two link testers are crossed a normally closed switch and are interconnected to constitute the 4th cyclization unit,
In described the first cyclization unit, the second cyclization unit, the 3rd cyclization unit and the 4th cyclization unit, each cyclization unit is at least connected by any one cyclization unit of an interconnection and other.
Realizing technical scheme of the present invention further comprises, the interconnection being connected between between described the first cyclization unit and described the second cyclization unit and described the 3rd cyclization unit and described the 4th cyclization unit, for interconnection in station, is also provided with a normal open switch on interconnection in described station.
Realizing technical scheme of the present invention further comprises, the interconnection being connected between any one cyclization unit in described the first cyclization unit and described the second cyclization unit and any one cyclization unit in described the 3rd cyclization unit and described the 4th cyclization unit, for interconnection between station, is also provided with a normal open switch on interconnection between described station.
According to the present invention of said structure, its beneficial effect is,
1, cyclization unit trend distributes simple and easy to control;
2, do not need back brake to turn confession when circuit " N-1 " fault, bus " N-1 " fault, the longitudinal differential protection that medium voltage distribution network adopts, isolated fault point, powers unaffected rapidly;
3, when circuit " N-1-1 ", " N-2 " fault or bus " N-1-1 ", " N-2 " fault, the longitudinal differential protection that medium voltage distribution network adopts, isolated fault point rapidly, the automated system that medium voltage distribution network is equipped with is simultaneously opened respective switch, makes to power unaffected;
While there is no-voltage of entire station in 4 ,Dang transformer stations, the longitudinal differential protection that medium voltage distribution network adopts, isolated fault point rapidly, the automated system of medium voltage distribution network outfit is simultaneously opened respective switch, hermetic section load, the simultaneously normal power supply of reserve part important load;
5, between cyclization unit, turn for ability flexible configuration as required, can ensure that high reliability also taken into account economy.
[accompanying drawing explanation]
Fig. 1 is the mode of connection figure of optimum embodiment of the present invention.
Fig. 2 is the mode of connection figure of another kind of embodiment of the present invention.
In the drawings,
A1, the first main transformer; A2, the second main transformer; A3, the 3rd main transformer; A4, the 4th main transformer;
B1, the 5th main transformer; B2, the 6th main transformer; B3, the 7th main transformer, B4, the 8th main transformer;
DL11, DL12, DL13, DL14, DL21, DL22, DL23, DL24, bus section;
L11, L12, L13, L14, L21, L22, L23, L24, circuit;
L1, L3, the interior interconnection of standing;
L2, L4, stand between interconnection;
K15, K16, K17, K18, K25, K26, K27, K28, normally closed switch;
KB11, KB12, KB13, KB21, KB22, KB23, normal open switch.
[embodiment]
Below in conjunction with accompanying drawing and execution mode, the present invention is conducted further description:
As shown in Figure 1, a kind of medium voltage distribution network two wires cyclization mode of connection, comprises and it is characterized in that the first transformer station and second transformer station of two parallel runnings,
Described the first transformer station comprises the first main transformer A1, the second main transformer A2, the 3rd main transformer A3 and the 4th main transformer A4, and adopt single busbar connection four section wiring modes in low-pressure side, wherein said the first main transformer A1 and described the second main transformer A2 paired running, bus section DL11 is connected by normally closed switch K15 with bus section DL12, described the 3rd main transformer A3 and described the 4th main transformer A4 paired running, bus section DL13 is connected by normally closed switch K16 with bus section DL14, bus section DL12 is connected by normal open switch KB11 with bus section DL13, bus section DL11, DL12 respectively separates a circuit L11, L12, circuit L11, L12 is interconnected to constitute the first cyclization unit by normally closed switch K17, bus section DL13, DL14 respectively separates a circuit L13, L14, circuit L13, L14 is interconnected to constitute the second cyclization unit by normally closed switch K18.
Described the second transformer station comprises the 5th main transformer B1, the 6th main transformer B2, the 7th main transformer B3 and the 8th main transformer B4, and adopt single busbar connection four section wiring modes in low-pressure side, wherein said the 5th main transformer B1 and described the 6th main transformer B2 paired running, bus section DL21 and bus section DL22 connect by normally closed switch K25, described the 7th main transformer B3 and described the 8th main transformer B4 paired running, bus section DL23 is connected by normally closed switch K26 with bus section DL24, bus section DL22 is connected by normal open switch KB21 with bus section DL23, bus section DL21, DL22 respectively separates a circuit L21, L22, circuit L21, L22 is interconnected to constitute the 3rd cyclization unit by a normally closed switch K27, bus section DL23, DL24 respectively separates a circuit L23, L24, circuit L23, L24 is interconnected to constitute the 4th cyclization unit by a normally closed switch K28.
Between between described the first cyclization unit and described the second cyclization unit and described the 3rd cyclization unit and described the 4th cyclization unit, by interconnection L1, L3 in described station, be connected, in described station, on interconnection L1, be also provided with a normal open switch KB12, in described station, on interconnection L3, be also provided with a normal open switch KB22.
Described the first cyclization unit is connected by interconnection L4 between described station with described the 4th cyclization unit, and between described station, on interconnection L4, be provided with normal open switch KB23, in described the second cyclization unit, be connected by interconnection L2 between described station with described the 3rd cyclization unit, between described station, on interconnection L2, be also provided with a normal open switch KB13.
When " N-1 " fault appears in circuit L11, the longitudinal differential protection adopting in medium voltage distribution network isolated fault immediately point, does not need other grid switching operation, thereby ensures power supply continuity, has realized the power supply of circuit " N-1 " fault ride-through.
When the head end of circuit L11, two circuits of L12 breaks down; while being circuit " N-1-1 " or " N-2 " fault; the longitudinal differential protection adopting in medium voltage distribution network isolated fault immediately point; the automated system that medium voltage distribution network is equipped with is opened normally closed switch K17; normal open switch KB12, KB23 is closed, restore electricity.
When " N-1 " fault appears in bus section DL11, the longitudinal differential protection adopting in medium voltage distribution network isolated fault immediately point, does not need other grid switching operation, thereby ensures power supply continuity, has realized the power supply of bus " N-1 " fault ride-through.
When the head end of bus section DL11, two lines of DL12 breaks down; while being bus " N-1-1 " or " N-2 " fault; the longitudinal differential protection adopting in medium voltage distribution network isolated fault immediately point; the automated system that medium voltage distribution network is equipped with is opened normally closed switch K17; normal open switch KB12, KB23 is closed, restore electricity.
When the first transformer station no-voltage of entire station; the longitudinal differential protection adopting in medium voltage distribution network isolated fault immediately point; switch in the automated system functional arrangement that medium voltage distribution network is equipped with simultaneously; sub-load on the second cyclization unit of the first cyclization unit that circuit L11 and L12 form, circuit L13 and L14 formation is cut off; by the closed normal open switch KB13 of automated system, the KB23 that are equipped with in medium voltage distribution network, now do not have the sub-load of cutting off to obtain power supply again.
For the power supply area of low reliability requirement, as shown in Figure 2, between between described the first cyclization unit and described the second cyclization unit and described the 3rd cyclization unit and described the 4th cyclization unit, be not connected interconnection in described station.
In this article, relational terms such as " first ", " second ", " the 3rd " is only used for an entity or operation and another one entity or operating space to separate, and not necessarily requires or imply relation or the order that has any this reality between these entities or operation.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
By reference to the accompanying drawings the present invention has been carried out to exemplary description above; obvious realization of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted method design of the present invention and technical scheme to carry out; or without improving, design of the present invention and technical scheme are directly applied to other occasion, all in protection scope of the present invention.
Claims (3)
1. a medium voltage distribution network two wires cyclization mode of connection, comprises the first transformer station and the second transformer station, it is characterized in that,
Described the first transformer station comprises the first main transformer, the second main transformer, the 3rd main transformer and the 4th main transformer, and adopt single busbar connection four section wiring modes in low-pressure side, wherein said the first main transformer and described the second main transformer paired running, the bus section of described the first main transformer is connected by a normally closed switch with the bus section of described the second main transformer, described the 3rd main transformer and described the 4th main transformer paired running, the bus section of described the 3rd main transformer is connected by a normally closed switch with the bus section of described the 4th main transformer, the bus section of described the second main transformer is connected by a normal open switch with the bus section of described the 3rd main transformer, the bus section of the bus section of described the first main transformer and described the second main transformer respectively separates a circuit, these two link testers are crossed a normally closed switch and are interconnected to constitute the first cyclization unit, the bus section of the bus section of described the 3rd main transformer and described the 4th main transformer respectively separates a circuit, these two link testers are crossed a normally closed switch and are interconnected to constitute the second cyclization unit,
Described the second transformer station comprises the 5th main transformer, the 6th main transformer, the 7th main transformer and the 8th main transformer, and adopt single busbar connection four section wiring modes in low-pressure side, wherein said the 5th main transformer and described the 6th main transformer paired running, the bus section of described the 5th main transformer is connected by a normally closed switch with the bus section of described the 6th main transformer, described the 7th main transformer and described the 8th main transformer paired running, the bus section of described the 7th main transformer is connected by a normally closed switch with the bus section of described the 8th main transformer, the bus section of described the 6th main transformer is connected by a normal open switch with the bus section of described the 7th main transformer, the bus section of the bus section of described the 5th main transformer and described the 6th main transformer respectively separates a circuit, these two link testers are crossed a normally closed switch and are interconnected to constitute the 3rd cyclization unit, the bus section of the bus section of described the 7th main transformer and described the 8th main transformer respectively separates a circuit, these two link testers are crossed a normally closed switch and are interconnected to constitute the 4th cyclization unit,
In described the first cyclization unit, the second cyclization unit, the 3rd cyclization unit and the 4th cyclization unit, each cyclization unit is at least connected by any one cyclization unit of an interconnection and other.
2. the medium voltage distribution network according to claim 1 two wires cyclization mode of connection, it is characterized in that, between described the first cyclization unit and described the second cyclization unit, and the interconnection being connected between described the 3rd cyclization unit and described the 4th cyclization unit is for interconnection in station, is also provided with a normal open switch in described station on interconnection.
3. the medium voltage distribution network according to claim 1 two wires cyclization mode of connection, it is characterized in that, the interconnection being connected between any one cyclization unit in described the first cyclization unit and described the second cyclization unit and any one cyclization unit in described the 3rd cyclization unit and described the 4th cyclization unit, for interconnection between station, is also provided with a normal open switch on interconnection between described station.
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| CN201310452364.9A CN103545807B (en) | 2013-09-29 | 2013-09-29 | A kind of medium voltage distribution network two wires cyclization mode of connection |
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Cited By (6)
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| CN105932674A (en) * | 2016-06-24 | 2016-09-07 | 国家电网公司 | Dual-line two-segment two-die medium-voltage overhead main distribution network and building method thereof |
| CN106684808A (en) * | 2016-09-08 | 2017-05-17 | 珠海电力设计院有限公司 | Double closed-loop/multiple closed-loop interconnected power distribution network wiring structure and power supply system |
| CN106712008A (en) * | 2017-01-17 | 2017-05-24 | 国网山东省电力公司青岛供电公司 | High-reliability 10kV power grid wiring system |
| CN109149956A (en) * | 2018-09-26 | 2019-01-04 | 云南电网有限责任公司电力科学研究院 | A kind of distribution ring device and method based on the adjusting of AC-AC voltage |
| CN109615175A (en) * | 2018-11-13 | 2019-04-12 | 广东电网有限责任公司 | A kind of 10kV medium-voltage line automation segmentation Rationality Assessment method |
| CN117335578A (en) * | 2023-12-01 | 2024-01-02 | 成都天合一成科技服务有限公司 | Detection and regulation system for loop closing power conversion of low-voltage power distribution |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932674A (en) * | 2016-06-24 | 2016-09-07 | 国家电网公司 | Dual-line two-segment two-die medium-voltage overhead main distribution network and building method thereof |
| CN106684808A (en) * | 2016-09-08 | 2017-05-17 | 珠海电力设计院有限公司 | Double closed-loop/multiple closed-loop interconnected power distribution network wiring structure and power supply system |
| CN106684808B (en) * | 2016-09-08 | 2019-03-22 | 珠海电力设计院有限公司 | A kind of the interconnection power distribution network wiring construction and power supply system of more closed loops |
| CN106712008A (en) * | 2017-01-17 | 2017-05-24 | 国网山东省电力公司青岛供电公司 | High-reliability 10kV power grid wiring system |
| CN109149956A (en) * | 2018-09-26 | 2019-01-04 | 云南电网有限责任公司电力科学研究院 | A kind of distribution ring device and method based on the adjusting of AC-AC voltage |
| CN109149956B (en) * | 2018-09-26 | 2020-05-29 | 云南电网有限责任公司电力科学研究院 | Distribution loop closing device and method based on AC-AC voltage regulation |
| CN109615175A (en) * | 2018-11-13 | 2019-04-12 | 广东电网有限责任公司 | A kind of 10kV medium-voltage line automation segmentation Rationality Assessment method |
| CN109615175B (en) * | 2018-11-13 | 2023-04-28 | 广东电网有限责任公司 | 10kV medium-voltage circuit automatic segmentation rationality evaluation method |
| CN117335578A (en) * | 2023-12-01 | 2024-01-02 | 成都天合一成科技服务有限公司 | Detection and regulation system for loop closing power conversion of low-voltage power distribution |
| CN117335578B (en) * | 2023-12-01 | 2024-02-06 | 成都天合一成科技服务有限公司 | Detection and regulation system for loop closing power conversion of low-voltage power distribution |
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