CN112583009A - Clear diamond type distribution network structure - Google Patents
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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Abstract
The invention provides a clear diamond type power distribution network structure, which comprises a plurality of high-voltage substations, a plurality of ring network chambers, a plurality of cable trunk lines and a plurality of power distribution chambers, wherein the clear diamond type power distribution network structure adopts a layered structure and is divided into a trunk network and a branch network; the main network comprises the high-voltage transformer substation and the ring network room, the ring network room is used as a load node and a contact node, four cable trunk lines of different high-voltage transformer substations and different buses supply power nearby, and the cable trunk lines are connected in a triple network and operate in an open loop; the branch network comprises the ring network room and the distribution room, the distribution room is used as an important user node, and the ring network room of different cable trunk lines is used as a superior power supply. The invention creates a breaker and protection for the incoming and outgoing lines of the medium-ring network room, and can avoid the influence of fault current change caused by the access of new elements such as a distributed power supply, a micro-grid and the like on the existing relay protection.
Description
Technical Field
The invention belongs to the field of power distribution networks, and particularly relates to a clear diamond type power distribution network structure.
Background
In 2019, large-area power failure occurs in Manhattan in New York, and the number of affected users exceeds 7 ten thousands of households, so that attention and thinking of various circles on the power safety of large cities are brought up again. For each big city, abundant and reliable power supply is required to be guaranteed, and meanwhile, the power grid needs to be developed and planned for a long time without rain and silk. Therefore, a new round of urban distribution network upgrading and reconstruction is developed in China, the requirements of load increase and urban development are met, but some problems and challenges still face to the medium-voltage distribution network in part of cities, and the problems and the challenges are mainly reflected in that: (1) the power supply of a single-side power supply is mainly used, a 10kV double-ring network structure in an A + type and A-type power supply area is not completely formed, the contact rates between stations are 68% and 65%, the full-rotation load capacity of a superior substation during full outage needs to be further improved, and the power supply safety of a power distribution network is reduced. (2) The power supply range of the transformer substation is unreasonably divided, effective connection with other transformer substations is difficult to establish, the extension capacity of a power grid is limited, the power supply range is difficult to expand, the load balance capacity between the transformer substations in a normal operation mode is insufficient, and the phenomena of light load and heavy load of the transformer substations in local areas coexist. (3) The direct transmission user lines of the transformer substation are more, the mounting capacity of part of users is smaller, and the utilization rate of the transformer substation interval is not high. (4) Compared with advanced countries and regions, the low power supply reliability of the power distribution network in China is obviously contradicted with the lean requirement of users on the power supply quality, and the improvement of the power supply reliability means huge investment, and the investment benefit of the power distribution network is difficult to embody.
Paris has the most advanced urban distribution network in European regions, and the 20kV distribution network in the urban Paris is mainly based on three-ring network connection, and three-ring network is formed by three-ray cables of two transformer substations, so that the three-ring network operates in an open loop mode. And a double-path power supply of each distribution room is respectively T-connected with any two different cables in the three-ring network, wherein one path is used as a main supply and the other path is used as a hot standby. The section switch and the interconnection switch of the three-ring network have a remote control function, the main and standby power cables of the medium/low-voltage distribution room are directly connected with the main cable in a T mode, when the cable fails, the main power supply load switch of the distribution room is switched off after the switch of the transformer substation is switched off for 3 seconds, then the standby load switch is switched on for 5 seconds, the power supply of the distribution room is recovered, and the operation is finished through an automatic device of equipment. The main defects of the method are as follows: (1) cable lines are arranged in urban areas, and the transformer substation is fully buried or semi-buried, so that the investment cost is high; (2) the line utilization rate is low, the maximum utilization rate is 33%, and the average utilization rate is less than 20%.
The Tokyo power distribution network is one of the representatives of the advanced power distribution networks in Asian regions, wherein the press-fit power distribution network mostly adopts a cable three-radio line with double subscriber access. The two-way power supply of each medium-voltage user is respectively T-connected with any two different cables in the three loops, wherein one of the two-way power supply is used as a main power supply, the other one of the two-way power supply is used as a hot standby power supply, and the line load rate can reach 67%. In normal mode, power is supplied according to a preset common main line. When the main line has power failure, under the condition that the main line has no internal accident of a user and the standby line has voltage, the power supply can be recovered after the instantaneous power failure through the automatic switching breaker, and the failure power failure time is greatly shortened. Main transformer and supplied circuit in the three-ray junction station all run in parallel for there is not instantaneous power failure when single circuit fault takes place, nevertheless lacks the circuit contact between the transformer substation, and load transfer between the station supplies and balanced ability not enough, can lead to whole load to lose the power when the total station has a power failure.
Disclosure of Invention
In view of the above, the present invention provides a clear diamond distribution network structure to overcome the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a clear diamond type power distribution network structure comprises a plurality of high-voltage substations, a plurality of ring network chambers, a plurality of cable trunk lines and a plurality of power distribution chambers, wherein the clear diamond type power distribution network structure adopts a layered structure and is divided into a trunk network and a branch network; the main network comprises the high-voltage transformer substation and the ring network room, the ring network room is used as a load node and a contact node, four cable trunk lines of different high-voltage transformer substations and different buses supply power nearby, and the cable trunk lines are connected in a triple network and operate in an open loop; the branch network comprises the ring network room and the distribution room, the distribution room is used as an important user node, and the ring network room of different cable trunk lines is used as a superior power supply.
Further, the high-voltage transformer substation is a 110kV transformer substation or a 220kV transformer substation;
the ring network chamber is a 10kV ring network chamber;
the cable backbone line is a 10kV backbone cable;
the distribution room is a 10kV distribution room.
Further, in the main network, the high-voltage substation is provided with self-healing devices according to the 10kV outgoing line intervals, the ring network room is provided with three remote DTUs, and the self-healing devices are provided according to the 10kV outgoing line intervals.
Furthermore, the high-voltage transformer substation and the ring network rooms are connected through 10kV backbone cables, any adjacent ring network rooms are connected through 10kV backbone cables, and each ring network room is provided with 2 loops of power supply inlet wires.
Furthermore, the main network at least comprises two high-voltage transformer substations, different buses of each high-voltage transformer substation respectively output 1 time of cable main line, and 4 times of cable main line in total is 1 group of diamond distribution network structures.
Further, the backbone network comprises 12 ring network chambers.
Furthermore, the ring network room is connected with the distribution room by a 10kV branch network cable.
Furthermore, the branch network adopts a power grid structure with double power supplies connected.
Compared with the prior art, the invention has the following advantages:
(1) the invention creates the configuration circuit breaker and protection of the incoming and outgoing lines of the medium-ring network chamber, not only can avoid the influence of fault current change caused by the access of new elements such as a distributed power supply, a micro-grid and the like on the existing relay protection, but also can solve the problem that the fusing curve of a fuse of an access point of a high-capacity user is difficult to be matched with a zero-sequence current protection setting value, and meets the access requirement of the high-capacity user. Therefore, a high-capacity user can be supplied with power by changing direct supply of the transformer substation into a ring network room, and the ring network room is used as a transformer substation bus to extend, so that direct supply user lines of the transformer substation are effectively reduced. In addition, the improvement of the utilization efficiency of the line is also beneficial to reducing the outgoing line of the 10kV line, and the problems of 10kV intervals and the shortage of outgoing line channels of the transformer substation are solved.
(2) The invention has good user access adaptability: the 10kV ring network room can be directly accessed to a power distribution room of a user or a ring network room of the user at intervals, and the nearby access of the user is realized. And a user with high requirement on power supply reliability can access different ring network room intervals nearby to realize a 'double-access' power supply mode. In addition, the improvement of the utilization efficiency of the line is also beneficial to reducing the outgoing line of the 10kV line, and the problems of 10kV intervals and the shortage of outgoing line channels of the transformer substation are solved.
(3) The invention creates a triple network structure that 1 in-station contact and 2 in-station contacts are arranged in 1 st to 3 rd ring network rooms of each 10kV trunk line, and the requirement of clear structure is met. Each ring network room is provided with a three-remote DTU and a self-healing device, the power supply reliability can reach 99.99965%, the utilization rate of 10kV line equipment under the condition of N-1 reaches 75%, the utilization rate of a transformer substation reaches 75% or more, and the high-reliability and high-utilization rate are achieved.
(4) The comprehensive cost of newly building a diamond type power grid in the blank area created by the invention is about 26% lower than the investment estimation of the most advanced 'double-petal' power distribution network in the world. Because the power supply capacity of the 10kV line is improved, the construction investment is reduced compared with the conventional ring network room cable double-ring network structure. The benefits generated by improving the reliability, balance and flexibility are comprehensively considered, and the diamond-type power distribution network is the preferred scheme for building strong smart city power grids in the future.
(5) The diamond-shaped power distribution network has the advantages that the diamond-shaped power distribution network is upgraded and modified on the basis of the existing network frame structure mainly comprising the single-ring network of the power distribution network, the 'local conditions' are more obvious, and the diamond-shaped power distribution network can be upgraded only by newly building or modifying a circuit between ring network rooms. Moreover, the scale of the newly-built line can be reduced by about 23% and 44% at most compared with a ring network room cable double-ring network and a 'double petal type' distribution network respectively, so that the line channel and the power supply interval of a superior substation are effectively saved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
fig. 1 is a schematic diagram of a diamond-type distribution network according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a backbone network structure according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a typical contact model of a diamond-type distribution network substation according to an embodiment of the present invention.
Description of reference numerals:
1-a high voltage substation; 2-a ring net chamber; 3-cable trunk line; 4-a distribution room; 5-branch network cable.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
A clear diamond type distribution network structure, as shown in fig. 1 to 3, comprises a plurality of high voltage substations 1, a plurality of ring network rooms 2, a plurality of cable trunk lines 3, and a plurality of distribution rooms 4, wherein the clear diamond type distribution network structure adopts a layered structure and is divided into a trunk network and a branch network; the main network comprises the high-voltage transformer substation 1 and the ring network room 2, the ring network room 2 is used as a load node and a contact node, the four cable main lines 3 of different high-voltage transformer substations 1 and different buses supply power nearby, and the cable main lines 3 are connected in a triple network and operate in an open loop mode; the branch network comprises the ring network room 2 and the distribution room 4, the distribution room 4 is used as an important user node, and the ring network room 2 of different cable trunk lines 3 is used as a superior power supply.
Compared with the existing power grid structure, the ring network room 2 is used as a load node and a contact node, the distribution room 4 is used as an important user node, and the ring network room 2 of different cable trunk lines 3 is used as a superior power supply; firstly, the power grids have different structures, the existing ring network room can be directly used for networking, the number and the types of stations in networking are greatly reduced, and the investment and the operation cost of the power grids are favorably reduced; secondly, the load rates of the lines are different, the invention adopts the ring network chamber to carry out networking, the load rate can reach 75 percent, and the load rate of the power distribution network is greatly improved.
Particularly, by adopting the ring network room 2 as the load node and the contact node, the power distribution network structure has better power transmission performance for the area with more dispersed loads.
The high-voltage transformer substation 1 is a 110kV transformer substation or a 220kV transformer substation; the ring network chamber 2 is a 10kV ring network chamber; the cable backbone line 3 is a 10kV backbone cable; the distribution room 4 is a 10kV distribution room.
In the main network, the high-voltage transformer substation 1 is provided with self-healing devices according to 10kV outgoing line intervals, the ring network room 2 is provided with three remote DTUs, and the self-healing devices are provided according to the 10kV outgoing line intervals; specifically, the self-healing device used in the existing power distribution network can be adopted, and a person skilled in the art can select a proper self-healing device as required.
The high-voltage transformer substation 1 and the ring network rooms 2 are connected by adopting a 10kV backbone cable, any adjacent ring network rooms 2 are connected by adopting a 10kV backbone cable, and each ring network room 2 is provided with 2 loops of power supply inlet wires; specifically, 2-time power supply incoming lines are arranged, 2-time power supplies (one main power supply and one standby power supply) of the trunk layer ring network room are achieved, load transfer is facilitated when N-1 faults occur, the purpose of power outage prevention is achieved, and the reliability of the power distribution network structure in operation is greatly improved.
The main network at least comprises two high-voltage transformer substations 1, different buses of each high-voltage transformer substation 1 respectively output 1 time of cable main line 3, and 4 times of cable main line 3 in total are 1 group of diamond type distribution network structures.
The main network comprises 12 ring network chambers 2; specifically, the circuit of the ring network room 2 networking, a 10kv circuit main line is 3 ring network rooms 2, on one hand, the load density of the area which is not too large is convenient to access in a distributed mode, on the other hand, the access capacity of the 10kv circuit is related to the access capacity of the 10kv circuit, generally, the access capacity of the 10kv circuit is about 12MVA, one ring network room is provided with 4MVA, and the perfect operation of the power distribution network can be realized by arranging 12 ring network rooms.
And the ring network room 2 is connected with the distribution room 4 by adopting a 10kV branch network cable 5.
The branch network adopts a power grid structure with double power supplies connected; specifically, the load of a power distribution network user is connected to the power grid in a power distribution room mode, and the power supply reliability is high, so that the power supply reliability of the power distribution network can be further improved by adopting dual power supply connection.
Example (b):
as shown in fig. 2, the invention provides a diamond-shaped distribution network structure with a clear structure, which is composed of a high-voltage substation, a cable trunk line, a ring network room and a distribution room; the high-voltage transformer substations are a 1#110kV transformer substation and a 2#110kV transformer substation, the cable trunk lines are lines 1-4, the looped network rooms are 1# looped network room-12 # looped network room, and the distribution rooms are a 1# distribution room and a 2# distribution room; the diamond type power distribution network adopts a layered structure and is divided into two levels of a 10kV backbone network and a 10kV backbone network, and power grids of different levels can adopt different wiring modes and secondary system configurations.
As shown in fig. 2, the 10kV backbone network uses a ring network room as a load node and a contact node, 4 10kV lines of different transformer substations and different buses supply power nearby, and the cable triple network is connected and operates in an open loop, so that the system has the characteristics of full cable, full circuit breaker, full interconnection and full self-healing, and can recover power supply at the second level after a fault occurs. The 10kV branch network comprises the ring network room and the distribution room, the distribution room is used as an important user node, the ring network rooms of different 10kV lines are used as a superior power supply, and a power grid structure with double power supplies connected is adopted.
Specifically, the method comprises the following steps: the diamond type distribution network comprises at least two transformer substations, different buses of each transformer substation respectively output 1-time 10kV trunk lines, and 4-time 10kV trunk lines in total, so that the cable triple-connection mode of four loops of the bilateral power supply supplies power nearby. The 10kV backbone network comprises 12 ring network rooms, and the line power supply capacity can meet the requirement of 'N-1' in a peak load normal mode and 'N-1' in a maintenance mode. In the 10kV branch network, a ring network room is connected with a distribution room by a 10kV branch network cable 5, and the different ring network rooms supply the power to form a double-access power grid structure.
In the embodiment, a self-healing device is configured in the transformer substation in the 10V backbone network according to 10kV outgoing line intervals, so that the self-healing switching-on function is realized when the outgoing line intervals open loops; each looped network room is provided with three remote DTUs and self-healing devices are arranged at intervals according to 10kV outgoing lines.
According to the diamond-type power distribution network, each ring network room has four power directions, load transfer can be rapidly realized by matching with self-healing, the access of distributed power sources and users is met, the operation safety, reliability, flexibility and adaptability of the power distribution network can be effectively improved, the diamond-type power distribution network is better jointed with the current power distribution network structure, the large-dismantling and large-building of the power distribution network is avoided, and the economical efficiency and the practicability of upgrading and transforming of the power distribution network are considered.
It is worth explaining that the 10kV backbone network in the diamond-type power distribution network supplies power to bilateral power supplies of different transformer substations, 1 st to 3 rd ring network rooms of each 10kV backbone line are provided with a triple network structure with 1 in-station contact and 2 in-station contacts, and the requirement of clear structure is met. Each ring network room is provided with a three-remote DTU and a self-healing device, the power supply reliability can reach 99.99965%, the utilization rate of 10kV line equipment under the condition of N-1 reaches 75%, the utilization rate of a transformer substation reaches 75% or above, and the system has high reliability and high utilization rate.
Particularly, main transformer configurations in different transformer substation stations are combined with different numbers of interconnected transformer substation seats, the transformer substations are communicated by adopting a diamond distribution network structure, a typical communication model of the transformer substation can be formed, the communication model has a clear structure, clear switching supply and few required lines, and the theoretical load rate of equipment is high under the condition of meeting the 'N-1'; a schematic diagram of a typical contact model for a diamond-type substation is shown in fig. 3.
In addition, the invention provides a full self-healing power distribution network structure which can improve the operation reliability, and the full self-healing power distribution network structure is specifically characterized in that: (1) the diamond type power distribution network original full-line configuration self-healing system is characterized in that a 10kV ring network room is provided with three remote DTUs and self-healing devices according to 10kV outgoing line intervals, the system has three remote functions of each interval, information collection is completed on site, and a self-healing strategy is automatically executed in a remote place; (2) the self-healing system exchanges switching value and fault information among the ring network rooms by using the optical fiber channel, and effectively ensures the load transfer capacity under the fault condition; (3) from the time of failure and power failure, the diamond type power distribution network operates in an open loop mode, and when a single failure occurs, self-healing switching of a line can be utilized, so that 'uninterrupted' operation is realized.
In the embodiment, all the incoming and outgoing lines of the ring network room can be provided with the circuit breakers, and the ring network room can be properly provided with the power distribution room according to the power utilization requirement; the outlet switch of the ring network chamber is provided with a relay protection and self-healing device, and when the branch line is a network line fault, the outlet protection action trips the outlet switch; and a ring network room of the newly-built or reconstructed power distribution network synchronously configures terminal equipment, optical cables and optical fiber private network equipment according to the three-remote standard.
Illustratively, the 10V trunk network line cable created by the invention can adopt a 3X 400mm2 cable, the branch network line can adopt a 3X 240mm2 cable, and the average value of the highest load rate of the 10V trunk network line is not higher than 75%.
The invention has the following beneficial effects:
(1) the invention creates the configuration circuit breaker and protection of the incoming and outgoing lines of the medium-ring network chamber, not only can avoid the influence of fault current change caused by the access of new elements such as a distributed power supply, a micro-grid and the like on the existing relay protection, but also can solve the problem that the fusing curve of a fuse of an access point of a high-capacity user is difficult to be matched with a zero-sequence current protection setting value, and meets the access requirement of the high-capacity user. Therefore, a high-capacity user can be supplied with power by changing direct supply of the transformer substation into a ring network room, and the ring network room is used as a transformer substation bus to extend, so that direct supply user lines of the transformer substation are effectively reduced. In addition, the improvement of the utilization efficiency of the line is also beneficial to reducing the outgoing line of the 10kV line, and the problems of 10kV intervals and the shortage of outgoing line channels of the transformer substation are solved.
(2) The invention has good user access adaptability: the 10kV ring network room can be directly accessed to a power distribution room of a user or a ring network room of the user at intervals, and the nearby access of the user is realized. And a user with high requirement on power supply reliability can access different ring network room intervals nearby to realize a 'double-access' power supply mode. In addition, the improvement of the utilization efficiency of the line is also beneficial to reducing the outgoing line of the 10kV line, and the problems of 10kV intervals and the shortage of outgoing line channels of the transformer substation are solved.
(3) The invention creates a triple network structure that 1 in-station contact and 2 in-station contacts are arranged in 1 st to 3 rd ring network rooms of each 10kV trunk line, and the requirement of clear structure is met. Each ring network room is provided with a three-remote DTU and a self-healing device, the power supply reliability can reach 99.99965%, the utilization rate of 10kV line equipment under the condition of N-1 reaches 75%, the utilization rate of a transformer substation reaches 75% or more, and the high-reliability and high-utilization rate are achieved.
(4) The comprehensive cost of newly building a diamond type power grid in the blank area created by the invention is about 26% lower than the investment estimation of the most advanced 'double-petal' power distribution network in the world. Because the power supply capacity of the 10kV line is improved, the construction investment is reduced compared with the conventional ring network room cable double-ring network structure. The benefits generated by improving the reliability, balance and flexibility are comprehensively considered, and the diamond-type power distribution network is the preferred scheme for building strong smart city power grids in the future.
(5) The diamond-shaped power distribution network has the advantages that the diamond-shaped power distribution network is upgraded and modified on the basis of the existing network frame structure mainly comprising the single-ring network of the power distribution network, the 'local conditions' are more obvious, and the diamond-shaped power distribution network can be upgraded only by newly building or modifying a circuit between ring network rooms. Moreover, the scale of the newly-built line can be reduced by about 23% and 44% at most compared with a ring network room cable double-ring network and a 'double petal type' distribution network respectively, so that the line channel and the power supply interval of a superior substation are effectively saved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (8)
1. The utility model provides a clear formula diamond type distribution network structure which characterized in that: the diamond-type power distribution network with a clear structure adopts a layered structure and is divided into a main network and a branch network; the main network comprises the high-voltage transformer substation and the ring network room, the ring network room is used as a load node and a contact node, four cable trunk lines of different high-voltage transformer substations and different buses supply power nearby, and the cable trunk lines are connected in a triple network and operate in an open loop; the branch network comprises the ring network room and the distribution room, the distribution room is used as an important user node, and the ring network room of different cable trunk lines is used as a superior power supply.
2. The structure of claim 1, wherein:
the high-voltage transformer substation is a 110kV transformer substation or a 220kV transformer substation;
the ring network chamber is a 10kV ring network chamber;
the cable backbone line is a 10kV backbone cable;
the distribution room is a 10kV distribution room.
3. The structure of claim 2, wherein: in the main network, the high-voltage transformer substation is provided with the self-healing devices according to the 10kV outgoing line intervals, the ring network room is provided with the three-remote DTUs, and the self-healing devices are provided according to the 10kV outgoing line intervals.
4. The structure of claim 2, wherein: the high-voltage transformer substation and the ring network rooms are connected through 10kV backbone cables, any adjacent ring network rooms are connected through 10kV backbone cables, and each ring network room is provided with 2-circuit power inlet wires.
5. The structure of claim 1, wherein: the main network at least comprises two high-voltage transformer substations, different buses of each high-voltage transformer substation respectively output 1 time of cable main trunk lines, and the total 4 times of cable main trunk lines are 1 group of diamond type distribution network structures.
6. The structure of claim 1, wherein: the backbone network comprises 12 ring network chambers.
7. The structure of claim 1, wherein: and the ring network room is connected with the distribution room by adopting a 10kV branch network cable.
8. The structure of claim 1, wherein: the branch network adopts a power grid structure with double power accesses.
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| CN113889985A (en) * | 2021-10-09 | 2022-01-04 | 国网上海市电力公司 | Relay protection system of diamond type electric wire netting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113889985A (en) * | 2021-10-09 | 2022-01-04 | 国网上海市电力公司 | Relay protection system of diamond type electric wire netting |
| CN113889985B (en) * | 2021-10-09 | 2024-03-19 | 国网上海市电力公司 | Relay protection system of diamond type power grid |
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Application publication date: 20210330 |