CN106786418A - A kind of relay protection scheme system for being used to get in touch between 10 kilovolts of switchyard stations - Google Patents

Abstract

The invention discloses a relay protection configuration system for inter-substation communication of 10 kV switch stations, comprising: two power sources of each switch station in three switch stations come from different substations, and inter-station relays are set between the switch stations Tie line; one interval is reserved for each section of the bus in the switch station to set up inter-station tie lines, which form hand in hand with adjacent switch stations and operate in an open loop; the three switch stations are single-bus section wiring, and each switch station Two-circuit incoming lines and six-circuit outgoing lines. The two incoming lines of each switch station come from two different substations. During normal operation, the switch at one end of the three dedicated lines is in the running state, and the switch at the other end is in the hot standby state. In the present invention, through the addition of inter-station communication between switch stations, the switch station will obtain backup power except for two incoming lines, providing a network frame foundation for horizontal transfer of loads, improving power redundancy and power supply reliability.

Description

A relay protection configuration system for inter-station communication of 10 kV switch station

technical field

The invention relates to the technical field of smart grids, in particular to a relay protection configuration system for inter-substation communication of 10 kV switching stations.

Background technique

Smart grid is the future development direction of China's power grid. Judging from the fact that the distribution network directly serves users, the construction of an intelligent distribution network ensures uninterrupted and reliable power supply, and can provide users with high-quality power and services, as well as functions such as automatic isolation of distribution network accidents. At the same time, the realization of the self-healing function, which is the main feature of the smart grid, is inseparable from the coordination and cooperation of distribution network planning, relay protection configuration and setting, and distribution network automation.

The distribution network is the part of the power system that directly faces power users, and is the central link to ensure the quality of power supply, customer service experience, and improve the economic efficiency of the power system. With the rise of smart grid technology and the continuous improvement of users' requirements for power supply quality and reliability, the intelligent high-voltage distribution network with self-healing characteristics has received extensive attention and attention. Self-healing control technology covers the fields of control and protection and distribution Many new developments in power grid automation are the extension of traditional distribution automation technology and the main means to realize the intelligence of distribution network, which is the inevitable trend of the development of smart distribution network in the future. From the user's point of view, "self-healing" enables the power grid to automatically and quickly restore power supply in the event of a failure, so that residents and users hardly feel the power outage; From the previous 2 to 3 hours shortened to 2 minutes or even a few seconds.

The power grid planning in the existing technology only meets the load demand and the balance of power supply and consumption, with more considerations for economy and applicability, and less consideration for safety and reliability. The relevant technical standards are lower than the standards of similar cities at home and abroad. From the source On the Internet, there are structural security risks such as "false double circuits" and "serial supply" in the power grid, leaving hidden dangers of accidents. Therefore, it is urgent to study the grid connection mode, optimize the grid structure, and study its self-healing function based on relay protection and automatic devices in various operating modes.

Contents of the invention

The purpose of the present invention is to provide a relay protection configuration system for inter-station communication of 10 kV switch station. By adding inter-station contact between switch stations, the switch station will obtain a backup power supply in addition to the two incoming lines, which is the lateral direction of the load. The transfer provides the grid foundation, improves power redundancy, and improves power supply reliability.

In order to achieve the above object, the present invention is realized through the following technical solutions: a relay protection configuration system for inter-station communication of 10 kV switching station, which is characterized in that it includes:

The first substation, the first 10kV busbar is arranged in the first substation;

The second substation, the second 10kV busbar is arranged in the second substation;

The first switching station, the first switching station is provided with a first subsection bus and a second subsection bus connected to each other, and the first subsection bus and the first 10kV bus are connected through the first switching station Line connection, the second subsection bus and the second 10kV bus are connected through the second switch station incoming line;

The second switching station, the second switching station is provided with a third subsection busbar and a fourth subsection busbar connected to each other, and the third subsection busbar and the first 10kV busbar are connected through the third switching station Line connection, the fourth subsection bus and the second 10kV bus are connected through the fourth switch station incoming line;

The third switch station, the third switch station is provided with the fifth subsection busbar and the sixth subsection busbar connected to each other, the fifth subsection busbar and the first switchyard are connected through the first inter-station Line connection, the sixth sub-section bus and the second switching station are connected through the second inter-station tie line;

The third substation is connected to the fifth subsection busbar through the incoming line of the fifth switching station;

The fourth substation is connected to the sixth subsection bus through the incoming line of the sixth switch station; wherein

The first switching station and the second switching station are connected through a third inter-station tie line.

The first switching station, the second switching station and the third switching station all include six outgoing lines from the switching station.

The outgoing line of the switch station is provided with a circuit breaker for the outgoing line of the switch station.

The first switch station, the second switch station and the third switch station all include a backup self-switching device, and the first switch station, the second switch station and the third switch station switch the backup power supply through the backup self-switching device .

The first substation circuit breaker is provided on the first 10kV bus, and the first substation circuit breaker is located between the incoming line of the first switching station and the incoming line of the third switching station; the second A second substation circuit breaker is provided on the 10kV bus, and the second substation circuit breaker is located between the incoming line of the second switching station and the incoming line of the fourth switching station.

A first switchyard section circuit breaker is set between the first section bus and the second section bus; a second switchyard section is set between the third section bus and the fourth section bus section circuit breaker; a third switching station section circuit breaker is arranged between the fifth section bus and the sixth section bus.

Two switching station incoming circuit breakers are respectively arranged on the first switching station incoming line, the second switching station incoming line, the third switching station incoming line and the fourth switching station incoming line.

The incoming line of the first switching station, the incoming line of the second switching station, the incoming line of the third switching station and the incoming line of the fourth switching station are all equipped with longitudinal differential protection.

The first inter-station tie line, the second inter-station tie line and the third inter-station tie line are respectively provided with two inter-station tie circuit breakers.

The first inter-station tie line, the second inter-station tie line and the third inter-station tie line are all equipped with longitudinal differential protection.

Compared with the prior art, a relay protection configuration system for inter-substation communication of 10 kV switching stations has the following advantages: by adding inter-substation inter-connection between substations, the substation will obtain backup power supply in addition to two incoming lines , to provide a network frame foundation for the horizontal transfer of loads, improve power supply redundancy, and improve power supply reliability; because of the standby self-injection device, the backup power supply can be switched through the standby self-injection device, due to its multiple advantages such as independence and simple logic, On the basis of distribution automation, it is bound to further improve the grid structure of the distribution network and increase the speed of self-healing of the distribution network.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of a relay protection configuration system for inter-station communication of a 10 kV switching station according to the present invention.

detailed description

The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

A relay protection configuration system for 10 kV switching station inter-station communication, as shown in Figure 1, includes: a first substation 100, the first 10kV busbar 101 is arranged in the first substation 100; the second Substation 200, the second substation 200 is provided with a second 10kV bus 201; the first switch station 300, the first switch station 300 is provided with a first segment bus 301 and a second segment bus connected to each other 302, the first subsection bus 301 and the first 10kV bus 101 are connected through the first switchyard incoming line 303, and the second subsection bus 302 and the second 10kV bus 201 are connected through the second switch The station incoming line 304 is connected; the second switching station 400, the second switching station 400 is provided with a third subsection bus 401 and a fourth subsection bus 402 connected to each other, the third subsection bus 401 and the first subsection bus A 10kV bus 101 is connected through the third switch station incoming line 403, and the fourth subsection bus 402 and the second 10kV bus 201 are connected through the fourth switching station incoming line 404; the third switching station 500, the The third switching station 500 described above is provided with a fifth section bus 501 and a sixth section bus 502 connected to each other. 801 connection, the sixth sub-section bus 502 is connected with the second switching station 400 through the second inter-station tie line 802; the third substation 600 is connected with the fifth substation through the incoming line 503 of the fifth switching station Section bus 501 is connected; the fourth substation 700 is connected to the sixth subsection bus 502 through the sixth switch station incoming line 504; wherein, the first switch station 300 and the second switch station 400 are connected through the first switch station 400 The connection line 803 between the three stations.

In this embodiment, the first switch station 300 includes six switch station outgoing lines, each switch station outgoing line is provided with a switch station outgoing circuit breaker; the second switch station 400 includes six switch station outgoing lines, each switch station A switchyard outlet circuit breaker is arranged on each outlet line; the third switchyard 500 includes six switchyard outlet lines, and each switchyard outlet line is provided with a switchyard outlet circuit breaker.

In this embodiment, the first switching station 300, the second switching station 400 and the third switching station 500 all include a backup self-injection device, and the first switching station 300, the second switching station 400 and the The third switch station 500 switches the backup power supply through the automatic switching device to ensure the reliability of power supply for users. Due to its multiple advantages such as independence and simple logic, it is bound to further improve the grid structure of the distribution network on the basis of distribution automation. , to increase the speed of distribution network self-healing.

In this embodiment, the first 10kV busbar 101 is provided with a first substation circuit breaker 102, and the first substation circuit breaker 102 is located between the incoming line 303 of the first switching station and the third switching station Between the incoming lines 403; the second 10kV busbar 201 is provided with a second substation circuit breaker 202, and the second substation circuit breaker 202 is located between the incoming line 304 of the second switching station and the fourth switching station Between incoming lines 404.

In this embodiment, a first switchyard section circuit breaker 305 is set between the first section bus 301 and the second section bus 302; the third section bus 401 and the fourth section A second switchyard section circuit breaker 405 is arranged between the busbars 402; a third switchyard section circuit breaker 505 is arranged between the fifth section bus bar 501 and the sixth section bus bar 502.

In this embodiment, two switchyard incoming circuit breakers are arranged on the first switchyard incoming line 303, wherein one switching station incoming line circuit breaker 103 is close to the first substation 100, and the other switching station incoming line circuit breaker 103 The line circuit breaker 306 is close to the first switch station 300; the second switch station incoming line 304 is provided with two switch station incoming circuit breakers, one of which is close to the first switching station 200, Another switchyard incoming line circuit breaker 307 is close to the first switching station 300; the third switching station incoming line 403 is provided with two switching station incoming line circuit breakers, and one switching station incoming line circuit breaker 104 is close to the described In the first substation 100, another switchyard incoming line circuit breaker 406 is close to the second switching station 400; the fourth switching station incoming line 404 is provided with two switching station incoming line circuit breakers, one of which is a switching station incoming line circuit breaker 204 is close to the second substation 200, and another switchyard incoming circuit breaker 407 is close to the second switching station 400; preferably, the first switching station incoming line 303, the second switching station incoming line 304. The incoming line 403 of the third switching station and the incoming line 404 of the fourth switching station are equipped with longitudinal differential protection to ensure that any point of failure on the line can be cut off instantaneously. After a fault occurs on the line, the distribution automation fault processing is as follows: (1) After the feeder fault occurs, the fault is judged according to the fault power information, and at the same time according to the reclosing action: the successful reclosing is identified as a transient fault, and the fault is processed; Successfully identified as a permanent fault, the substation outlet circuit breaker tripped to cut off the fault current. (2) The master station judges the fault area according to the collected fault information of each switch reported by the power distribution terminal. Remotely control the opening and closing of the surrounding switches of the corresponding faulty area to isolate the faulty area, and remotely control the closing of the corresponding substation outlet circuit breaker and the corresponding contact switch of the corresponding ring network cabinet to restore the power supply in the healthy area, and store the relevant information in the permanent fault handling record.

In this embodiment, two inter-station tie breakers are set on the first inter-station tie line 801, one of which is close to the first switchyard 300, and the other inter-station tie breaker The device 506 is close to the third switching station 500; the second inter-station tie line 802 is provided with two inter-station tie circuit breakers, and one of the inter-station tie circuit breakers 408 is close to the second switch station 400, Another inter-station tie circuit breaker 507 is close to the third switching station 500; two inter-station tie circuit breakers are set on the third inter-station tie line 803, one of which is close to the inter-station tie circuit breaker 309. In the first switching station 300, another inter-station tie circuit breaker 409 is close to the second switching station 400; preferably, the first inter-station tie line 801, the second inter-station tie line 802 and the third station The connection line 803 is equipped with longitudinal differential protection to ensure that any fault on the line can be cut off instantaneously. After a fault occurs on the line, the distribution automation fault processing is as follows: (1) After the feeder fault occurs, the fault is judged according to the fault power information, and at the same time according to the reclosing action: the successful reclosing is identified as a transient fault, and the fault is processed; Successfully identified as a permanent fault, the substation outlet circuit breaker tripped to cut off the fault current. (2) The master station judges the fault area according to the collected fault information of each switch reported by the power distribution terminal. Remotely control the opening and closing of the surrounding switches of the corresponding faulty area to isolate the faulty area, and remotely control the closing of the corresponding substation outlet circuit breaker and the corresponding contact switch of the corresponding ring network cabinet to restore the power supply in the healthy area, and store the relevant information in the permanent fault handling record.

In the present invention, the two power sources of each switch station in the three switch stations come from different substations, and inter-station tie lines are set between the switch stations. In the case of losing two upper-level power sources, the switchyard can still transfer loads to achieve horizontal backup. One interval is reserved for each section of the busbar in the switch station to set up inter-station tie lines, which form hand-in-hand with adjacent switch stations and operate in an open loop. The diameter of the inter-station tie line is the same as that of the switch station incoming line. The three switch stations are single-female segmented wiring. Each switch station has two incoming lines and six outgoing lines. The two incoming lines of each switching station come from two different substations. During normal operation, three contact lines are connected at one end. The switch is in the running state, and the switch at the other end is in the hot standby state.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. Various modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the above disclosure. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (10)

1. A relay protection configuration system for inter-station contact of 10 kilovolt switching stations, characterized in that it comprises: The first substation, the first 10kV busbar is arranged in the first substation; The second substation, the second 10kV busbar is arranged in the second substation; The first switching station, the first switching station is provided with a first subsection bus and a second subsection bus connected to each other, and the first subsection bus and the first 10kV bus are connected through the first switching station Line connection, the second subsection bus and the second 10kV bus are connected through the second switch station incoming line; The second switching station, the second switching station is provided with a third subsection busbar and a fourth subsection busbar connected to each other, and the third subsection busbar and the first 10kV busbar are connected through the third switching station Line connection, the fourth subsection bus and the second 10kV bus are connected through the fourth switch station incoming line; The third switch station, the third switch station is provided with the fifth subsection busbar and the sixth subsection busbar connected to each other, the fifth subsection busbar and the first switchyard are connected through the first inter-station Line connection, the sixth sub-section bus and the second switching station are connected through the second inter-station tie line; The third substation is connected to the fifth subsection busbar through the incoming line of the fifth switching station; The fourth substation is connected to the sixth subsection bus through the incoming line of the sixth switch station; wherein The first switching station and the second switching station are connected through a third inter-station tie line. 2. The relay protection configuration system according to claim 1, wherein the first switching station, the second switching station and the third switching station each include six outgoing lines from the switching station. 3. The relay protection configuration system according to claim 2, characterized in that, the outgoing lines of the switching station are equipped with circuit breakers for the outgoing lines of the switching station. 4. The relay protection configuration system as claimed in claim 1, characterized in that, said first switch station, second switch station and third switch station all include a backup automatic switching device, and said first switch station Station, the second switching station and the third switching station switch the backup power supply through the backup self-switching device. 5. The relay protection configuration system according to claim 1, wherein a first substation circuit breaker is provided on the first 10kV bus, and the first substation circuit breaker is located at the first Between the incoming line of the switching station and the incoming line of the third switching station; the second substation circuit breaker is arranged on the second 10kV bus, and the second substation circuit breaker is located between the incoming line of the second switching station and the The fourth switch station is between incoming lines. 6. The relay protection configuration system according to claim 1, characterized in that, a first switchyard section circuit breaker is set between the first section bus and the second section bus; A second switchyard section circuit breaker is arranged between the third section bus and the fourth section bus; a third switchyard section circuit breaker is arranged between the fifth section bus and the sixth section bus. 7. The relay protection configuration system according to claim 1, characterized in that, the incoming line of the first switching station, the incoming line of the second switching station, the incoming line of the third switching station and the incoming line of the fourth switching station Set up two switch station incoming circuit breakers respectively. 8. The relay protection configuration system according to claim 1 or 7, characterized in that, the incoming line of the first switching station, the incoming line of the second switching station, the incoming line of the third switching station and the incoming line of the fourth switching station All lines are equipped with longitudinal differential protection. 9. The relay protection configuration system according to claim 1, characterized in that two inter-station connection lines are respectively set on the first inter-station connection line, the second inter-station connection line and the third inter-station connection line breaker. 10. The relay protection configuration system according to claim 1 or 9, characterized in that, the first inter-station tie line, the second inter-station tie line and the third inter-station tie line are all equipped with longitudinal differential Protect.