CN113488969B - Intelligent protection device for power transmission line - Google Patents
Intelligent protection device for power transmission line Download PDFInfo
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- CN113488969B CN113488969B CN202110699358.8A CN202110699358A CN113488969B CN 113488969 B CN113488969 B CN 113488969B CN 202110699358 A CN202110699358 A CN 202110699358A CN 113488969 B CN113488969 B CN 113488969B
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- 230000009471 action Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
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Classifications
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/042—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned combined with means for locating the fault
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
- H02J13/00017—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus using optical fiber
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
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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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/248—UPS systems or standby or emergency generators
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Computer Networks & Wireless Communication (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The application provides an intelligent protection device for a power transmission line, which comprises a plurality of first controllable switch units, a plurality of second controllable switch units, a third controllable switch unit and an optical fiber pilot protection device; the first controllable switch unit is connected in series in a power supply path of a first power transmission line powered by a first power supply and is in a normally closed state; the second controllable switch unit is connected in series in a power supply path of a second power transmission line supplied by a second power supply and is in a normally closed state; the third controllable switch unit is configured to: the first end is electrically connected with the first power transmission line, and the second end is electrically connected with the second power transmission line and is in a normally open state; the optical fiber pilot protection device is electrically connected with the control end of the first controllable switch unit, the control end of the second controllable switch unit and the control end of the third controllable switch unit. The intelligent protection device for the power transmission line has the functions of line protection and automatic backup power switching, reduces equipment investment and saves cost.
Description
Technical Field
The invention relates to the technical field of power transmission, in particular to an intelligent protection device for a power transmission line.
Background
With the continuous development of modern power technology, the scale of the power network is larger and larger, the complexity is higher and higher, and various safety protection devices are required to be installed in order to ensure the stability of the power system. The automatic switching device of the standby power supply is the most common one. The automatic switching device of the standby power supply is a device which can automatically and rapidly switch the standby power supply into operation or switch a user to the standby power supply after the working power supply is disconnected due to faults, so that the user is not powered off, and the automatic switching device is short for standby power automatic switching.
Along with the continuous improvement of the requirements of users on the power supply reliability, the influence of power faults on the power failure of the users is reduced, the spare power automatic switching device is generally independently installed in each transformer substation, each spare power automatic switching device needs to be connected with the bus voltage of the substation, the line current, the position information of the circuit breaker and the loop cable for controlling the opening and closing of the circuit breaker, and the wiring is complex and the cost is high.
Disclosure of Invention
Based on the above, it is necessary to provide an intelligent protection device for a power transmission line, which solves the problems of complex wiring and high cost caused by the need of separately installing a spare power automatic switching device in the prior art, and reduces unnecessary resource waste.
The application provides an intelligent protection device for a power transmission line, which comprises a plurality of first controllable switch units, a plurality of second controllable switch units, a third controllable switch unit and an optical fiber pilot protection device; the first controllable switch unit is connected in series in a power supply path of a first power transmission line powered by a first power supply and is in a normally closed state; the second controllable switch unit is connected in series in a power supply path of a second power transmission line supplied by a second power supply and is in a normally closed state; the third controllable switch unit is configured to: the first end is electrically connected with the first power transmission line, and the second end is electrically connected with the second power transmission line and is in a normally open state; the optical fiber pilot protection device is electrically connected with the control end of the first controllable switch unit, the control end of the second controllable switch unit and the control end of the third controllable switch unit, and is used for generating switch control information according to the acquired electric information of the first power transmission line, the acquired position information of the first controllable switch unit, the acquired electric information of the second power transmission line and the acquired position information of the second controllable switch unit so as to control the first controllable switch unit, the second controllable switch unit and the third controllable switch unit to act, so that the first power transmission line and the second power transmission line work normally.
The intelligent protection device for the power transmission line does not need to be provided with an independent automatic switching device, can directly utilize the existing optical fiber pilot protection device to control the switch to be switched on to realize the automatic switching function, does not need extra wiring, and simultaneously has the functions of automatic tripping and cutting and fault isolation under the condition of line faults, so that the existing resources are utilized to the greatest extent, the resource waste is reduced, and the installation and use cost is greatly reduced.
In one embodiment, the switch control information comprises switch trip control information, and the fiber optic pilot protection device is configured to:
judging power transmission line fault position information according to the electric information of the first power transmission line, the position information of the first controllable switch unit, the electric information of the second power transmission line and the position information of the second controllable switch unit, and generating switch tripping control information according to the power transmission line fault position information so as to control the first controllable switch unit or the second controllable switch unit positioned at two sides of a fault position indicated by the power transmission line fault position information to trip and isolate fault points.
In the above embodiment, the optical fiber pilot protection device can quickly react and quickly cut off the switches at two sides of the fault point under the condition that the power transmission line has a short circuit fault, isolate the short circuit fault, and prevent the short circuit current from damaging the power transmission line equipment.
In one embodiment, the switch control information further includes switch closing control information, and the fiber optic pilot protection device is configured to:
and judging real-time power supply position information according to the electric information of the first electric transmission line and the electric information of the second electric transmission line, and generating switch closing control information according to the real-time power supply position information so as to control the third controllable switch unit to close, so that the power supply indicated by the real-time power supply position information supplies power through the third controllable switch unit.
In the above embodiment, when the power transmission line has a short circuit fault, the optical fiber pilot protection device can quickly respond to the input of the standby switch under the condition that the switch successfully cuts off the fault line, so as to quickly switch on the standby power supply for the transformer substation which loses power due to the short circuit fault, thereby shortening the power failure time to the greatest possible extent and reducing the power failure loss.
In one embodiment, the electrical information includes at least one of voltage, current, and power.
In one embodiment, the first transmission line includes a plurality of first substations;
at least one first transformer substation is provided with two first controllable switch units which are respectively positioned at the inlet end and the outlet end of the first transformer substation.
In one embodiment, the second transmission line comprises a plurality of second substations;
at least one second transformer substation is provided with two second controllable switch units which are respectively positioned at the inlet end and the outlet end of the second transformer substation.
In one embodiment, the optical fiber pilot protection device comprises a plurality of protection devices which are in communication connection; the sum of the numbers of the first controllable switch units, the second controllable switch units and the third controllable switch units is equal to the number of the protection devices; the first controllable switch unit, the second controllable switch unit and the third controllable switch unit are respectively and correspondingly provided with the protection device.
In one embodiment, the protection devices are interconnected via fiber optic communications.
In one embodiment, at least one of the first controllable switch unit, the second controllable switch unit, and the third controllable switch unit includes a circuit breaker.
In still another aspect, the present application provides an intelligent protection method for a power transmission line, which is implemented based on the apparatus described in any one of the foregoing embodiments, and the method includes:
acquiring the electric information of the first power transmission line, the position information of the first controllable switch unit, the electric information of the second power transmission line and the position information of the second controllable switch unit;
generating switch control information according to the electric information of the first power transmission line, the position information of the first controllable switch unit, the electric information of the second power transmission line and the position information of the second controllable switch unit;
and controlling the first controllable switch unit, the second controllable switch unit and the third controllable switch unit to act based on the switch control information, so that the first power transmission line and the second power transmission line work normally.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an intelligent protection device for a power transmission line in an embodiment;
fig. 2 is a schematic diagram of an intelligent protection device for a power transmission line according to an embodiment;
fig. 3 is a schematic diagram of operation of an intelligent protection device for a power transmission line according to another embodiment;
fig. 4 is a schematic structural diagram of a protection device in an embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first controllable switching unit may be referred to as a second controllable switching unit, and similarly, a second controllable switching unit may be referred to as a first controllable switching unit, without departing from the scope of the present application. Both the first controllable switch unit and the second controllable switch unit are controllable switch units, but they are not the same controllable switch unit.
It is to be understood that in the following embodiments, "electrically connected" is understood to mean "electrically connected", "electrically connected in communication", etc., if the electrically connected circuits, modules, units, etc., have electrical signals or data transferred therebetween.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
In order to improve the power supply reliability and reduce the occurrence probability of power failure accidents, a double-loop power supply mode is generally adopted in a modern power grid, a standby power supply is included in a power supply source, when a power transmission line with normal power supply has a short circuit fault, relay protection of the line acts, a fault point is disconnected, normal power supply of part of substations is necessarily cut off, the standby power supply is required to be quickly put into, the power supply of the substation with the cut-off power supply can be quickly recovered, and the reliability of the power supply is guaranteed. The power transmission line code specifies that a transmission line powered by two or more power sources must be provided with a contact disconnection point during normal power supply in order to avoid electromagnetic ring network. Under the condition that the line is normal, the switch of the connection disconnection point is in a normally open state, once the line has a short circuit fault and the transformer substation loses power due to relay protection action, the switch of the connection disconnection point is immediately closed, and a standby power supply is connected to the transformer substation which loses power.
In order to realize the standby power supply switching process, a set of standby automatic switching device is generally installed in each transformer substation so as to ensure that the matched standby automatic switching device can be used for switching the switching equipment of the contact disconnection point under the condition that any transformer substation is provided with the contact disconnection point, thereby increasing a large number of devices and wiring, and correspondingly increasing the cost.
In order to realize timely fault point isolation when faults occur on the transmission line in the power system, the optical fiber pilot protection devices are arranged on two sides of the transmission line, each set of protection device is respectively connected with the bus voltage of the station, the line current, the position information of the circuit breaker and a loop cable for controlling the opening and closing of the circuit breaker, and the optical fiber pilot protection device can also know the operation state of the standby side through optical fiber communication, and has no function of spare automatic switching in the logic function of the device.
The intelligent protection device for the power transmission line comprises a plurality of first controllable switch units, a plurality of second controllable switch units, a third controllable switch unit and an optical fiber pilot protection device; the first controllable switch unit is connected in series in a power supply path of a first power transmission line supplied by a first power supply and is in a normally closed state; the second controllable switch unit is connected in series in a power supply path of a second power transmission line supplied by a second power supply and is in a normally closed state; the third controllable switch unit is configured to: the first end is electrically connected with the first power transmission line, and the second end is electrically connected with the second power transmission line and is in a normally open state; the optical fiber pilot protection device is electrically connected with the control end of the first controllable switch unit, the control end of the second controllable switch unit and the control end of the third controllable switch unit and is used for generating switch control information according to the acquired electric information of the first power transmission line, the position information of the first controllable switch unit, the electric information of the second power transmission line and the position information of the second controllable switch unit so as to control the first controllable switch unit, the second controllable switch unit and the third controllable switch unit to act, so that the first power transmission line and the second power transmission line work normally.
The intelligent protection device for the power transmission line, which is provided by the embodiment, does not need to be provided with an automatic switching device alone, can directly utilize the existing optical fiber pilot protection device to control the switch to switch on so as to realize the spare power automatic switching function, does not need extra wiring, and simultaneously has the functions of automatic tripping and cutting and fault isolation under the condition of line faults, thereby maximally utilizing the existing resources, reducing the resource waste and greatly reducing the installation and use cost.
In some embodiments of the present application, the switch control information includes switch trip control information, and the fiber optic pilot protection device is configured to:
judging power transmission line fault position information according to the electric information of the first power transmission line, the position information of the first controllable switch unit, the electric information of the second power transmission line and the position information of the second controllable switch unit, and generating switch tripping control information according to the power transmission line fault position information so as to control the first controllable switch unit or the second controllable switch unit positioned at two sides of the fault position indicated by the power transmission line fault position information to trip and isolate fault points.
In the embodiment, the optical fiber pilot protection device can quickly react under the condition that the power transmission line has short-circuit faults, quickly cut off switches on two sides of a fault point, isolate the short-circuit faults and prevent short-circuit current from damaging power transmission line equipment.
In some embodiments of the present application, the switch control information further includes switch closing control information, and the fiber optic pilot protection device is configured to:
and judging the position information of the real-time power supply according to the electric information of the first power transmission line and the electric information of the second power transmission line, and generating switch closing control information according to the position information of the real-time power supply so as to control the third controllable switch unit to close, so that the power supply indicated by the position information of the real-time power supply supplies power through the third controllable switch unit.
In the above embodiment, when the power transmission line has a short circuit fault, the optical fiber pilot protection device can quickly respond to the input of the standby switch under the condition that the switch successfully cuts off the fault line, so as to quickly switch on the standby power supply for the transformer substation which loses power due to the short circuit fault, thereby shortening the power failure time to the greatest possible extent and reducing the power failure loss.
Some embodiments of the invention are further described below with reference to the accompanying drawings.
Referring to fig. 1, in one embodiment, an intelligent protection device for a power transmission line provided in the present application includes: the first controllable switch unit 111, the first controllable switch unit 112, the first controllable switch unit 113 and the first controllable switch unit 114 are connected in series in a power supply path of the first power transmission line 10 powered by the first power supply and are in a normally closed state, wherein the first controllable switch unit 111 and the first controllable switch unit 112 are correspondingly arranged with the first transformer substation 121, and the first controllable switch unit 113 and the first controllable switch unit 114 are correspondingly arranged with the first transformer substation 122;
the second controllable switch unit 211, the second controllable switch unit 212 and the second controllable switch unit 213 are connected in series in a power supply path of the second power transmission line 20 powered by the second power supply and are in a normally closed state, wherein the second controllable switch unit 211 is arranged corresponding to the second transformer substation 221, and the second controllable switch unit 212 and the second controllable switch unit 213 are arranged corresponding to the second transformer substation 222;
the third controllable switch unit 30 is configured to: the first end is electrically connected with the first power transmission line 10, and the second end is electrically connected with the second power transmission line 20 and is in a normally open state;
the optical fiber pilot protection device comprises a protection device 115, a protection device 116, a protection device 117, a protection device 118, a protection device 40, a protection device 214, a protection device 215 and a protection device 216 which are connected through optical fiber communication, and is used for generating switch control information according to acquired electric information of the first power transmission line 10, the first controllable switch unit 111, the first controllable switch unit 112, position information of the first controllable switch unit 113 and the first controllable switch unit 114, electric information of the second power transmission line 20, position information of the second controllable switch unit 211, the second controllable switch unit 212 and the second controllable switch unit 213, so as to control the first controllable switch unit 111, the first controllable switch unit 112, the first controllable switch unit 113, the first controllable switch unit 114, the second controllable switch unit 211, the second controllable switch unit 212, the second controllable switch unit 213 and the third controllable switch unit 30 to operate, so that the first power transmission line 10 and the second power transmission line 20 normally operate, wherein the protection device 115 is correspondingly arranged to the first controllable switch unit 111, the second controllable switch unit 211 is correspondingly arranged to the protection device 116 and the protection device 116 is correspondingly arranged to the first controllable switch unit 112, the first controllable switch unit 211 is correspondingly arranged to the protection device 215 and the protection device 213 is correspondingly arranged to the first controllable switch unit 116, the protection device 117 is correspondingly arranged to the protection device 40, and the protection device is correspondingly arranged to the protection device 117 is correspondingly arranged to the first controllable switch unit 211.
Specifically, it should be noted that, in the above embodiment, the number of each element needs to be determined according to the actual number of substations, where the number in this application is only illustrative, and each substation corresponds to two controllable switch units, one is an incoming switch and the other is an outgoing switch, and the functions of the two are not specifically limited and are determined according to the actual use situation. The third controllable switch unit 30 is set as a connection disconnection point, and the connection disconnection point can be any one of the first controllable switch unit or the second controllable switch unit, which is determined according to actual use situations.
Specifically, each protection device forms a local area network through optical fiber communication, shares real-time position information and electric information of a power transmission line where the protection device is positioned, and can mutually send a switch operation instruction. When the protection device detects that the short-circuit fault information of the circuit is required to disconnect the corresponding switch, the protection device sends a tripping instruction to the corresponding controllable switch unit, and the controllable switch unit trips to cut off fault current; when the protection device detects that the bus of the transformer substation is out of voltage, according to the shared position information of other protection devices and corresponding power supply information, when the third controllable switch unit 30 with the contact disconnection point is required to be put into operation, a switch closing instruction is sent to the protection device 40, the protection device 40 sends a closing instruction to the third controllable switch unit 30, the third controllable switch unit 30 is put into operation, and a standby power supply is connected to the transformer substation with power loss.
In particular, each first controllable switching unit may be mainly a circuit breaker; each second controllable switching unit may be mainly a circuit breaker.
The intelligent protection device for the power transmission line, which is provided by the embodiment, does not need to be provided with an automatic switching device alone, can directly utilize the existing optical fiber pilot protection device to control the switch to switch on so as to realize the spare power automatic switching function, does not need extra wiring, and simultaneously has the functions of automatic tripping and cutting and fault isolation under the condition of line faults, thereby maximally utilizing the existing resources, reducing the resource waste and greatly reducing the installation and use cost.
To further illustrate the specific operating principle of the apparatus illustrated in fig. 1, referring to fig. 2, in one embodiment, a short-circuit fault occurs in the transmission line between the second substation 221 and the second substation 222 of the second transmission line 20, and an overcurrent impact occurs inside the second transmission line 20, which seriously threatens the equipment security of the second substation 221 and the second substation 222.
Specifically, the protection devices 214 and 215 at two sides of the fault point detect a large line fault current, quickly start a protection action, respectively send tripping instructions to the second controllable switch unit 211 and 212, quickly trip the second controllable switch unit 211 and 212, cut off the fault transmission line, and protect the safety of the internal devices of the second transformer substation 221 and 222.
Specifically, since the second controllable switch unit 211 and the second controllable switch unit 212 trip, the second substation 221 originally powered by the second power source instantaneously loses the power source, at this time, the protection device 40 where the connection disconnection point is located detects that the bus of the second substation 221 where the protection device 40 is located loses voltage, meanwhile, the protection device 40 detects that the bus of the first substation 122 of the first transmission line 10 is powered normally through the information shared by optical fiber communication, and the corresponding first controllable switch unit 114 is in the closing position, it is determined that the second substation 221 can be powered through the first power source, the protection device 40 sends a closing instruction to the third controllable switch unit 30 to control the third controllable switch unit 30 to close, and the second substation 221 recovers the power supply.
To further illustrate the specific operating principle of the apparatus illustrated in fig. 1, referring to fig. 3, in another embodiment, a short-circuit fault occurs in the transmission line between the first substation 121 and the first substation 122 of the first transmission line 10, and an overcurrent surge occurs inside the first transmission line 10, which seriously threatens the equipment security of the first substation 121 and the first substation 122.
Specifically, the protection devices 116 and 117 at two sides of the fault point detect a large line fault current, quickly start a protection action, respectively send tripping instructions to the first controllable switch unit 112 and the first controllable switch unit 113, quickly trip the first controllable switch unit 112 and the first controllable switch unit 113, cut off the fault transmission line, and protect the safety of the internal devices of the first transformer substation 121 and the first transformer substation 122.
Specifically, since the first controllable switch unit 112 and the first controllable switch unit 113 trip, the first transformer station 122 originally powered by the first power source instantaneously loses the power supply, at this time, the protection device 118 inside the first transformer station 122 detects that the bus of the first transformer station 122 loses voltage, meanwhile, the protection device 118 detects that the bus of the second transformer station 221 of the second transmission line 20 is powered normally through the information shared by optical fiber communication, and the corresponding third controllable switch unit 30 is in the opening position, it is determined that the first transformer station 122 can be powered through the second power source, the protection device 118 sends a switch closing instruction to the protection device 40, the protection device 40 sends a closing instruction to the third controllable switch unit 30 to control the third controllable switch unit 30 to close, and the first transformer station 122 recovers the power supply.
Referring to fig. 4, in one embodiment, the protection device includes a main control module 1000, an operating mechanism 2000 and a network module 3000, where the operating mechanism 2000 is used to control the circuit breaker to close or trip according to an operation instruction; the main control module 1000 is electrically connected with the operation mechanism 2000 and is used for sending an operation instruction to the operation mechanism 2000 according to the fault information of the power transmission line to open or close the circuit breaker; the network module 3000 is electrically connected to the main control module 1000, and is configured to obtain real-time position information of all controllable switch units of the power transmission line, electrical information of the power transmission line where the controllable switch units are located, and a switch operation instruction sent between the protection devices, and send the information to the main control module 1000.
Specifically, the operation mechanism 2000 includes an outlet relay 2100 and a start relay 2200, where the outlet relay 2100 is electrically connected to the main control module 1000 and the start relay 2200, and is used to control the opening or closing of the circuit breaker, and the start relay 2200 is electrically connected to the main control module 1000, and is used to provide power for the outlet relay 2100 after being turned on.
Specifically, the main control module 1000 includes an action DSP1100 and a start DSP1200, where the action DSP1100 is electrically connected to the start DSP1200 and the exit relay 2100, for controlling the exit relay 2100 to act, and the start DSP1200 is electrically connected to the start relay 2200 and the network module 3000, for controlling the start relay 2200 to act, and for receiving information from the network module 3000 and other protection devices. The digital signal generated after the analog signal of the voltage and current obtained from the sampling of the power transmission line passes through the AD conversion module and the switch opening and closing state signal generated by the switch operation unit enter the action DSP1100 and the starting DSP1200, the action DSP1100 and the starting DSP1200 perform data comparison, if the data received by the action DSP1100 and the starting DSP1200 are consistent, the protection device is considered to work normally, and if the data deviation received by the action DSP and the starting DSP is beyond a preset range, the protection device is considered to work abnormally, so that an alarm is generated to remind a worker to check the protection device.
Specifically, if the protection device detects a fault current signal under the condition that the protection device works normally, the starting DSP1200 will send a closing instruction to the starting relay 2200 to control the starting relay 2200 to close, and then to switch on the power supply to the outlet relay 2100, at this time, the action DSP1100 sends a tripping instruction to the outlet relay 2100, and the outlet relay 2100 controls the controllable switch unit to trip, so as to cut off the fault current, thereby realizing the line protection function.
If the protection device detects a bus voltage loss fault, the start DSP1200 will generate a closing signal according to the fault voltage signal of the fault side substation, the normal voltage signal of the standby side substation and the opening state information of the third controllable switch unit 30, send the closing signal to the protection device 40 through the network module 3000, control the third controllable switch unit 30 to close by the protection device 40, access the standby power for the power loss substation, or
The starting DSP1200 controls the starting relay 2200 to be switched on according to the received switching-on instruction sent by the fault side protection device, so as to switch on the power supply for the outlet relay 2100, and meanwhile, the action DSP1100 sends the switching-on instruction to the outlet relay 2100, controls the circuit breaker to be switched on, and switches on the standby power supply for the power-losing side transformer substation.
Specifically, the network module 3000 includes a CPU3100, an LCD3200, an LED3300, a keyboard 3400, a printing module 3500, a clock module 3600, and an ethernet module 3700, where the LCD3200, the LED3300, the keyboard 3400, the printing module 3500, the clock module 3600, and the ethernet module 3700 are all electrically connected to the CPU3100, and each protection device forms a local area network through the ethernet module 3700, shares real-time data with each other, facilitates real-time analysis and calculation by the main control module 1000, precisely controls actions of each controllable switch unit, and ensures normal operation of the power transmission line.
It should be noted that, in the embodiments provided in the present application, it should be understood that the disclosed technical content may be implemented in other manners. The system embodiments described above are merely exemplary, and for example, the division of the units may be a logic function division, and there may be another division manner when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units described above may be implemented in hardware.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (10)
1. The intelligent protection device for the power transmission line is characterized by comprising a plurality of first controllable switch units, a plurality of second controllable switch units, a third controllable switch unit and an optical fiber pilot protection device;
the first controllable switch unit is connected in series in a power supply path of a first power transmission line powered by a first power supply and is in a normally closed state;
the second controllable switch unit is connected in series in a power supply path of a second power transmission line supplied by a second power supply and is in a normally closed state;
the third controllable switch unit is configured to: the first end is electrically connected with the first power transmission line, and the second end is electrically connected with the second power transmission line and is in a normally open state;
the optical fiber pilot protection device is electrically connected with the control end of the first controllable switch unit, the control end of the second controllable switch unit and the control end of the third controllable switch unit, and is used for generating switch control information according to the acquired electric information of the first power transmission line, the acquired position information of the first controllable switch unit, the acquired electric information of the second power transmission line and the acquired position information of the second controllable switch unit, wherein the optical fiber pilot protection device comprises a plurality of protection devices which are in communication interconnection, the first controllable switch unit, the second controllable switch unit and the third controllable switch unit are respectively correspondingly provided with the protection devices, the protection devices share the position information and the electric information, and the protection devices mutually send switch operation instructions so as to control the first controllable switch unit, the second controllable switch unit and the third controllable switch unit to act, so that the first power transmission line and the second power transmission line work normally.
2. The apparatus of claim 1, wherein the switch control information comprises switch trip control information, the fiber pilot protection apparatus configured to:
judging power transmission line fault position information according to the electric information of the first power transmission line, the position information of the first controllable switch unit, the electric information of the second power transmission line and the position information of the second controllable switch unit, and generating switch tripping control information according to the power transmission line fault position information so as to control the first controllable switch unit or the second controllable switch unit positioned at two sides of a fault position indicated by the power transmission line fault position information to trip and isolate fault points.
3. The apparatus of claim 2, wherein the switch control information further comprises switch closing control information, the fiber optic pilot protection apparatus configured to:
and judging real-time power supply position information according to the electric information of the first electric transmission line and the electric information of the second electric transmission line, and generating switch closing control information according to the real-time power supply position information so as to control the third controllable switch unit to close, so that the power supply indicated by the real-time power supply position information supplies power through the third controllable switch unit.
4. A device according to any one of claims 1-3, wherein the electrical information comprises at least one of voltage, current and power.
5. A device according to any one of claims 1-3, wherein the first transmission line comprises a plurality of first substations;
at least one first transformer substation is provided with two first controllable switch units, and the two first controllable switch units are respectively positioned at the inlet end and the outlet end of the first transformer substation.
6. A device according to any one of claims 1-3, wherein the second transmission line comprises a plurality of second substations;
at least one second transformer substation is provided with two second controllable switch units, and the second controllable switch units are respectively positioned at the inlet end and the outlet end of the second transformer substation.
7. The apparatus of claim 1, wherein each of the protection devices is interconnected via fiber optic communications.
8. A device according to any one of claims 1-3, wherein at least one of the first, second and third controllable switching units comprises a circuit breaker.
9. The intelligent protection device for a power transmission line according to claim 1, wherein the protection device comprises:
the main control module is used for acquiring fault information and generating an operation instruction;
the operating mechanism is electrically connected with the main control module and is used for acquiring the operating instruction and controlling the circuit breaker to be switched on or tripped according to the operating instruction;
and the network module is electrically connected with the main control module, and is used for acquiring the position information, the electric information and the switch control information and sending the position information, the electric information and the switch control information to the main control module.
10. An intelligent protection method for a power transmission line, characterized in that the method is implemented based on the apparatus of any one of claims 1-9, and the method further comprises:
acquiring the electric information of the first power transmission line, the position information of the first controllable switch unit, the electric information of the second power transmission line and the position information of the second controllable switch unit;
generating switch control information according to the electric information of the first power transmission line, the position information of the first controllable switch unit, the electric information of the second power transmission line and the position information of the second controllable switch unit;
and controlling the first controllable switch unit, the second controllable switch unit and the third controllable switch unit to act based on the switch control information, so that the first power transmission line and the second power transmission line work normally.
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