CN110752591A - Line system for realizing line self-healing - Google Patents
Line system for realizing line self-healing Download PDFInfo
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- CN110752591A CN110752591A CN201910993802.XA CN201910993802A CN110752591A CN 110752591 A CN110752591 A CN 110752591A CN 201910993802 A CN201910993802 A CN 201910993802A CN 110752591 A CN110752591 A CN 110752591A
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- switch
- line
- normally closed
- switch box
- voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/266—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving switching on a spare supply
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to the technical field of power grids, in particular to a line system for realizing line self-healing, wherein a plurality of outdoor switch boxes are arranged between main supply lines of two substations, outgoing line switches are arranged between the main supply lines and the substations, two normally closed switches are arranged in the outdoor switch boxes and are connected with a protection system, the two normally closed switches are respectively connected with the main supply lines of the two substations, a connection switch box is also arranged, the connection switch box is connected with a bus of a standby supply substation through a standby supply line, the standby supply line is provided with the outgoing line switches, the connection switch boxes are arranged between any two adjacent outdoor switch boxes, a passage is arranged between the connection switch box and the outdoor switch boxes, a normally open switch connected with a protection terminal is arranged on the passage between the connection switch box and the outdoor switch boxes, and the connection switch box is provided with a normally closed switch connected with the protection terminal and arranged on the standby supply line, the interconnection switch box is provided with a voltage sensor. The invention has the advantages of shortening the time for recovering power supply and improving the reliability of power supply.
Description
Technical Field
The invention relates to the technical field of power grids, in particular to a line system for realizing line self-healing.
Background
In the medium-voltage distribution network cable line, the self-healing technology based on the in-situ feeder automation means that after the line breaks down and is successfully isolated, the interconnection switch is switched on, and the non-fault section of the fault line is supplied with power by the interconnection line, so that the power supply recovery time of the line is shortened, and the power supply reliability of the line is improved. At present, the self-healing technology is mostly applied to a 2-1 single-ring network wiring mode. The 2-1 single-ring network wiring mode has high power supply reliability, simple wiring and convenient operation, but the line utilization rate is lower and is only 50 percent. In order to improve the line utilization rate, a 2-1 single-ring network wiring mode is modified to form a 'two-supply one-standby' wiring mode, and the line utilization rate reaches 67%. The self-healing technology of the 'two supply and one standby' wiring mode is lack of research and practice at present.
Disclosure of Invention
In order to solve the problem of low line utilization rate of the power grid self-healing technology in the prior art, the invention provides a line system for realizing line self-healing, and the line system has the advantages of shortening the power supply recovery time and improving the power supply reliability.
In order to solve the technical problems, the invention adopts the technical scheme that: a line system for realizing self-healing of lines is characterized in that a plurality of outdoor switch boxes are arranged between main supply lines of two substations, an outlet switch is arranged between the main supply lines and the substations, two normally closed switches connected with a protection system are arranged in the outdoor switch boxes, the normally closed switches are connected with the protection system and are respectively connected with the main supply lines of the two substations, an interconnection switch box is also arranged and is connected with a bus of a standby supply substation through a standby supply line, the standby supply line is provided with the outlet switch, the interconnection switch box is arranged between any two adjacent outdoor switch boxes, a passage is arranged between the interconnection switch box and the outdoor switch boxes, a normally open switch connected with a protection terminal is arranged on the passage between the interconnection switch box and the outdoor switch boxes, the interconnection switch box is provided with a normally closed switch connected with the protection terminal and arranged on the standby supply line, and is provided with a voltage sensor, the voltage sensor is used for measuring the voltage of a passage between the interconnection switch box and the outdoor switch box, the bus voltage of the standby power supply transformer substation and the voltage of the standby power supply line, and the protection terminal is connected with the voltage sensor.
In one embodiment, the interconnection switch box is provided with two normally open switches and one normally closed switch, the two normally open switches being in communication with the interconnection switch box and the outdoor switch box, respectively.
In one embodiment, four sets of voltage sensors are provided for measuring the voltage of the paths between the two tie switch boxes and the outdoor switch box, the bus voltage of the backup substation, and the voltage of the backup line, respectively.
In one embodiment, the protection system is provided with a current sensor, a voltage sensor and a protection terminal, wherein the current sensor and the voltage sensor are used for measuring the current and the voltage of a normally closed switch of an outdoor switch box, and the protection terminal is connected with the current sensor, the voltage sensor and the normally closed switch and used for controlling the normally closed switch to be opened or closed.
Preferably, the outlet switch is provided with a current sensor and a protection terminal.
Compared with the prior art, the invention has the following characteristics:
the invention arranges four sets of voltage sensor devices in the interconnection switch box for detecting incoming line voltage and bus voltage. When the main power supply circuit breaks down, each switch acts to realize automatic isolation, and meanwhile, the normally open switch of the interconnection switch box is closed, so that the power supply of the non-fault section of the fault circuit is recovered, the power recovery time is shortened, and the power supply reliability is improved. In addition, when the standby power supply line breaks down, the interconnection switch is not closed after the fault isolation, so that the protection configuration is simplified, the power supply recovery time is shortened, and the power supply reliability is improved under the condition that a user is not influenced. In addition, the tie switch is not closed when the backup line fails. Because the spare supply line has no load, the protection configuration is simplified under the condition of not influencing users.
Drawings
Fig. 1 is a schematic diagram of a circuit structure in an embodiment of the invention.
Detailed Description
The drawings are for illustration purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Example (b):
the invention provides a line system for realizing self-healing of lines, wherein a plurality of outdoor switch boxes are arranged between main supply lines of two substations, an outgoing line switch is arranged between the main supply lines and the substations, and the outgoing line switch is provided with a current sensor and a protection terminal. The outdoor switch box is internally provided with two normally closed switches, the normally closed switches are connected with a protection system, the protection system is provided with a current sensor, a voltage sensor and a protection terminal, the current sensor and the voltage sensor are used for measuring the current and the voltage of the normally closed switches of the outdoor switch box, and the protection terminal is connected with the current sensor, the voltage sensor and the normally closed switches and used for controlling the normally closed switches to be opened or closed.
Two main supply lines of two substations are connected respectively to two normally closed switches, the line system of circuit self-healing still is equipped with the contact switch box, the contact switch box is equipped with the generating line that supplies the transformer substation through supplying the line connection fully, it is equipped with the switch of being qualified for the next round of competitions to supply the line fully, the contact switch box is located between arbitrary two adjacent outdoor switch boxes, be equipped with the route between contact switch box and the outdoor switch box, the route between contact switch box and the outdoor switch box is equipped with the normally open switch that is connected with protection terminal, the contact switch box is equipped with the normally closed switch that is connected with protection terminal who locates on supplying the line fully, the contact switch box is equipped with voltage sensor, voltage sensor is used for measuring the voltage of the route between contact switch box and the outdoor switch box, the generating line voltage of supplying the transformer substation and the voltage of supplying the line fully.
In this embodiment, the interconnection switch box is provided with two normally open switches and a normally closed switch, and the two normally open switches are respectively arranged on the path between the interconnection switch box and the outdoor switch box. The four sets of voltage sensors are respectively used for measuring the voltage of a passage between the two interconnection switch boxes and the outdoor switch box, the bus voltage of the standby power supply transformer substation and the voltage of the standby power supply line.
As shown in fig. 1, in this embodiment, the outdoor switch boxes are respectively provided with a normally closed switch K4, a normally closed switch K5, a normally closed switch K6, and a normally closed switch K7, the two ends of each of the plurality of outdoor switch boxes are respectively provided with a substation, a substation 1 bus and a substation 2 bus, the substation 1 bus extends out of the main supply line 1, the substation 2 bus extends out of the main supply line 2, the interconnection switch box is provided with a normally closed switch K3, a normally open switch K1, and a normally open switch K2, the normally closed switch K3 is connected with a standby supply line and the outdoor switch box, the normally open switch K1 and the normally open switch K2 are respectively connected with a passage between the interconnection switch box and the outdoor switch box, and the interconnection switch box is connected with a substation 3 bus through.
Normally, normally open switch K1, normally open switch K2 disconnection, outdoor switch box #2 supplies power by main supply line 1 to outdoor switch box # 4's load promptly, and outdoor switch box #5 supplies power by main supply line 2 to outdoor switch box # 7's load.
When a cable line between the switch K4 and the switch K5 of the main power supply line 1 has a fault, the self-healing process of the line is as follows:
s1: when a cable line between the normally closed switch K4 and the normally closed switch K5 breaks down, the substation outgoing switch B1 and the outgoing switch B2 trip, and the normally closed switch K4 and the normally closed switch K5 lose voltage and are switched off;
s2: after the time delay of the first reclosing, the protection terminal controls the outgoing switch B1 and the outgoing switch B2 to coincide;
s3: the normally closed switch K4 is pressed, the protection terminal controls the normally closed switch K4 to be switched on, when the current sensor detects fault current, the protection terminal controls the normally closed switch K4 to be switched off and locked, meanwhile, the normally closed switch K5 is at a switching-off position, and when the current sensor detects residual voltage of the normally closed switch K5, the protection terminal controls the normally closed switch K5 to be locked in a switching-off state;
s4: after the set time delay, the protection terminal controls the normally open switch K1 to be switched on, the rear section line of the normally closed switch K5 recovers power supply, and meanwhile, the protection terminal controls the normally open switch K2 to be switched on in a locking mode.
When a cable line between the normally closed switch K6 and the normally closed switch K7 of the main power supply line 2 has a fault, the self-healing process of the line is as follows:
s1: when a cable line between the normally closed switch K6 and the normally closed switch K7 breaks down, the substation outgoing switch B1 and the outgoing switch B2 trip, and the normally closed switch K6 and the normally closed switch K7 lose voltage and are switched off;
s2: after the time delay of the first reclosing, the protection terminal controls the outgoing switch B1 and the outgoing switch B2 to coincide;
s3: the normally closed switch K6 is pressed, the protection terminal controls the normally closed switch K6 to be switched on, when the current sensor detects fault current, the protection terminal controls the normally closed switch K6 to be switched off and locked, meanwhile, the normally closed switch K7 is at a switching-off position, and when the current sensor detects residual voltage of the normally closed switch K7, the protection terminal controls the normally closed switch K7 to be locked in a switching-off state;
s4: after the set time delay, the protection terminal controls the normally open switch K2 to be switched on, the rear section line of the normally closed switch K6 recovers power supply, and meanwhile, the protection terminal controls the normally open switch K1 to be switched on in a locking mode.
When the standby supply line fails, the self-healing process of the line is as follows:
s1: when the spare power cable line breaks down, the outgoing line switch B3 trips, the normally closed switch K3 loses voltage, and the protection terminal controls the normally closed switch K3 to open;
s2: after the time delay of the first reclosing, the protection terminal controls the outgoing switch B3 to be reclosed, and when fault current is detected, the protection terminal trips again;
s3: normally closed switch K3 is in the separating brake position, and voltage sensor detects normally closed switch K3 residual voltage, and protection terminal control normally closed switch K3 locks at the separating brake state, and normally open switch K1 and normally open switch K2 are the non-delay combined floodgate simultaneously.
The self-healing process of the wiring line is 'two supply and one standby', 'two supply' refers to two main supply lines in the line, and 'one standby' refers to one standby supply line in the line.
The protection terminal for controlling the normally closed switch and the normally open switch in the protection system is a mature technical scheme disclosed in the field.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (5)
1. A line system for realizing line self-healing is characterized in that a plurality of outdoor switch boxes are arranged between main supply lines of two substations, a line outlet switch is arranged between the main supply lines and the substations, two normally closed switches connected with a protection system are arranged in the outdoor switch boxes, the two normally closed switches are respectively connected with main supply lines of the two substations, the line system is further provided with a connection switch box, the connection switch box is connected with a bus of a standby supply substation through a standby supply line, the standby supply line is provided with the line outlet switch, the connection switch box is arranged between any two adjacent outdoor switch boxes, a passage is arranged between the connection switch box and the outdoor switch boxes, a normally open switch connected with a protection terminal is arranged on the passage between the connection switch box and the outdoor switch boxes, and the connection switch box is provided with a normally closed switch connected with the protection terminal and arranged on the standby supply line, the interconnection switch box is provided with a voltage sensor, the voltage sensor is used for measuring the voltage of a passage between the interconnection switch box and the outdoor switch box, the bus voltage of a standby power supply transformer substation and the voltage of a standby power supply line, and the protection terminal is connected with the voltage sensor.
2. A line system for realizing self-healing of lines according to claim 1, wherein the interconnection switch box is provided with two normally open switches and one normally closed switch, and the two normally open switches are respectively connected with the communication path between the interconnection switch box and the outdoor switch box.
3. A line system for realizing self-healing of lines according to claim 1, wherein four sets of voltage sensors are provided for measuring the voltage of the paths between the two tie switch boxes and the outdoor switch box, the bus voltage of the backup substation, and the voltage of the backup line, respectively.
4. A line system for realizing self-healing of a line according to claim 1, wherein the protection system is provided with a current sensor, a voltage sensor and a protection terminal, the current sensor and the voltage sensor are used for measuring the current and the voltage of a normally closed switch of an outdoor switch box, and the protection terminal is connected with the current sensor, the voltage sensor and the normally closed switch and is used for controlling the normally closed switch to be opened or closed.
5. A line system for realizing self-healing of lines according to claim 4, wherein the outgoing switch is provided with a current sensor and a protection terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910993802.XA CN110752591A (en) | 2019-10-18 | 2019-10-18 | Line system for realizing line self-healing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910993802.XA CN110752591A (en) | 2019-10-18 | 2019-10-18 | Line system for realizing line self-healing |
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| CN110752591A true CN110752591A (en) | 2020-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910993802.XA Pending CN110752591A (en) | 2019-10-18 | 2019-10-18 | Line system for realizing line self-healing |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109088409A (en) * | 2018-09-27 | 2018-12-25 | 广州供电局有限公司 | Power distribution network wiring construction |
| CN110086255A (en) * | 2019-05-06 | 2019-08-02 | 广东电网有限责任公司 | A kind of distribution open loop point management method |
| CN110197302A (en) * | 2019-05-30 | 2019-09-03 | 华南理工大学 | A kind of distribution network planning method considering Connection Mode topological constraints |
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2019
- 2019-10-18 CN CN201910993802.XA patent/CN110752591A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109088409A (en) * | 2018-09-27 | 2018-12-25 | 广州供电局有限公司 | Power distribution network wiring construction |
| CN110086255A (en) * | 2019-05-06 | 2019-08-02 | 广东电网有限责任公司 | A kind of distribution open loop point management method |
| CN110197302A (en) * | 2019-05-30 | 2019-09-03 | 华南理工大学 | A kind of distribution network planning method considering Connection Mode topological constraints |
Non-Patent Citations (2)
| Title |
|---|
| 刘健 等: "配电网模式化故障处理方法研究", 《电网技术》 * |
| 郑淑仪 等: "配电智能分布式馈线自动化调试方案的研究与设计", 《电工技术》 * |
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Application publication date: 20200204 |