CN113488969A - Intelligent protection device for power transmission line - Google Patents

Intelligent protection device for power transmission line Download PDF

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Publication number
CN113488969A
CN113488969A CN202110699358.8A CN202110699358A CN113488969A CN 113488969 A CN113488969 A CN 113488969A CN 202110699358 A CN202110699358 A CN 202110699358A CN 113488969 A CN113488969 A CN 113488969A
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CN
China
Prior art keywords
controllable switch
switch unit
transmission line
power transmission
protection device
Prior art date
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Granted
Application number
CN202110699358.8A
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Chinese (zh)
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CN113488969B (en
Inventor
王其林
张文
冯宗建
张瑞
李洪卫
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Shenzhen Power Supply Co ltd
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Shenzhen Power Supply Co ltd
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Priority to CN202110699358.8A priority Critical patent/CN113488969B/en
Publication of CN113488969A publication Critical patent/CN113488969A/en
Application granted granted Critical
Publication of CN113488969B publication Critical patent/CN113488969B/en
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

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  • 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 powered by a second power supply and is in a normally-closed state; the third controllable switch unit is configured to: the first end of the first power transmission line is electrically connected with the first power transmission line, and the second end of the first power transmission line 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 spare power switching, reduces equipment investment and saves cost.

Description

Intelligent protection device for power transmission line
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 power networks is larger and more complicated, and various safety protection devices need to be installed to ensure the stability of power systems. The automatic switching device of the standby power supply is the most common one. The automatic switching device for 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 prevented from being powered off, and is called the standby power supply for short.
With the continuous improvement of the requirement of a user on the reliability of power supply and the reduction of the influence of power failure on the power failure of the user, a spare power automatic switching device is generally and independently installed in each transformer substation, and each set of spare power automatic switching device needs to be connected into a loop cable for controlling the bus voltage, the line current, the position information of the circuit breaker and the opening and closing of the circuit breaker, so that the wiring is complex and the cost is high.
Disclosure of Invention
Based on this, 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 backup 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 on one hand, and the intelligent protection device 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 powered by a second power supply and is in a normally-closed state; the third controllable switch unit is configured to: the first end of the first power transmission line is electrically connected with the first power transmission line, and the second end of the first power transmission line 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 utility model provides a transmission line intelligence protection device need not install alone and is equipped with the automatic switching device, can directly utilize existing optic fibre pilot protection device control switch combined floodgate to realize being equipped with the automatic switching function, also need not extra wiring, still has automatic tripping operation excision and isolation fault function under the line fault condition simultaneously, furthest's utilization current resource, has reduced the wasting of resources, has reduced installation and use cost by a wide margin.
In one embodiment, the switch control information includes switch trip control information, and the fiber pilot protection device is configured to:
and judging the fault position information of the power transmission line 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 fault position information of the power transmission line 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 fault position information of the power transmission line to trip and isolate the fault point.
In the above embodiment, the optical fiber pilot protection device can rapidly react to rapidly cut off the switches on both sides of the fault point when the power transmission line has a short-circuit fault, so as to 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 optical fiber pilot protection device is configured to:
and judging real-time power supply source position information 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 real-time power supply source position information to control the third controllable switch unit to be closed, so that the power supply source indicated by the real-time power supply source position information supplies power through the third controllable switch unit.
In the embodiment, when the power transmission line has a short-circuit fault, the optical fiber pilot protection device can quickly respond to the situation that the switch successfully cuts off the fault line, so that the standby switch can be quickly switched on for the substation losing power due to the short-circuit fault, the power failure time can be shortened to the greatest extent, and the power failure loss can be reduced.
In one embodiment, the electrical information includes at least one of voltage, current, and power.
In one embodiment, the first transmission line comprises 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 wire inlet end and the wire 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 wire inlet end and the wire outlet end of the second transformer substation.
In one embodiment, the fiber pilot protection device comprises a plurality of communicatively interconnected protection devices; the sum of the number of the first controllable switch units, the number of the second controllable switch units and the number of 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, each of the protection devices is interconnected via fiber optic communication.
In one embodiment, at least one of the first controllable switch unit, the second controllable switch unit and the third controllable switch unit comprises a circuit breaker.
In another aspect, the present application provides an intelligent protection method for a power transmission line, which is implemented based on the apparatus in any of the above embodiments, and the method includes:
acquiring the electrical information of the first power transmission line, the position information of the first controllable switch unit, the electrical information of the second power transmission line and the position information of the second controllable switch unit;
generating switch control information according to the electrical information of the first power transmission line, the position information of the first controllable switch unit, the electrical 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 in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an intelligent protection device for a power transmission line in an embodiment;
fig. 2 is a working schematic diagram of an intelligent protection device for a power transmission line in an embodiment;
fig. 3 is a working schematic diagram of an intelligent protection device for a power transmission line in another embodiment;
fig. 4 is a schematic structural diagram of a protection device in an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth 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 present 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, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, the first controllable switch unit may be referred to as the second controllable switch unit, and similarly, the second controllable switch unit may be referred to as the first controllable switch 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 "electrically connected" in the following embodiments is to be understood as "electrically connected", "communicatively electrically connected", and the like, if circuits, modules, units, and the like, which are electrically connected, have electrical signals or data transfer therebetween.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" 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 modern power grid usually adopts a double-loop power supply mode, a power supply comprises a standby power supply, when a power transmission line normally supplying power has a short-circuit fault, the power transmission line performs relay protection action, a fault point is disconnected, the normal power supply of part of substations can be cut off inevitably, at the moment, the standby power supply needs to be put into rapidly, the substations which cut off the power supply can recover power transmission rapidly, and the power supply reliability is ensured. The power transmission line regulation stipulates that a power transmission line powered by two or more power supplies needs to be provided with a contact disconnection point during normal power supply in order to avoid causing an electromagnetic looped network. Under the normal condition of circuit, the switch of this liaison disconnection point is in normally open state, and in case the circuit appears short circuit fault and there is the transformer substation because of the relay protection action loses the electricity, the switch of this liaison disconnection point is closed at once, inserts stand-by power supply for the transformer substation that loses the electricity.
In order to realize the process of putting the standby power supply into operation, each transformer substation is generally provided with a set of spare power automatic switching device so as to ensure that the spare power automatic switching devices matched with any transformer substation can be used for switching the switch equipment of the contact disconnection point under the condition that any transformer substation is provided with the contact disconnection point, so that a large number of devices and wires are added, and the cost is correspondingly increased.
In the power system, in order to timely isolate fault points when faults occur on the power transmission line, optical fiber longitudinal protection devices are arranged on two sides of the power transmission line, each protection device is respectively connected with a bus voltage, a line current, circuit breaker position information of the power transmission line and a loop cable for controlling opening and closing of the circuit breaker, and the optical fiber longitudinal protection devices can also know the running state of a standby side through optical fiber communication and only have no function of spare power automatic switching on the logic function of the device.
An embodiment of 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 powered 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 transmission line, and the second end is electrically connected with the second 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 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 and enable the first power transmission line and the second power transmission line to work normally.
The intelligent protection device for the power transmission line provided by the embodiment does not need to be provided with the spare power automatic switching device independently, can directly utilize the existing optical fiber pilot protection device to control the switch to be switched on so as to realize the spare power automatic switching function, does not need extra wiring, and simultaneously has the functions of automatic tripping, cutting off and fault isolation under the condition of line fault, so that the existing resources are utilized to the maximum extent, the resource waste is reduced, and the installation and use cost is greatly reduced.
In some embodiments of the present application, the switch control information comprises switch trip control information, the fiber pilot protection device configured to:
and judging the fault position information of the power transmission line 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 fault position information of the power transmission line 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 fault position information of the power transmission line to trip and isolate the fault point.
In the above embodiment, the optical fiber pilot protection device can rapidly react to rapidly cut off the switches on both sides of the fault point when the power transmission line has a short-circuit fault, so as to isolate the short-circuit fault and prevent the short-circuit current from damaging the power transmission line equipment.
In some embodiments of the present application, the switch control information further includes switch closing control information, the fiber 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 to control the third controllable switch unit to be closed, so that the power supply indicated by the position information of the real-time power supply is supplied with power through the third controllable switch unit.
In the embodiment, when the power transmission line has a short-circuit fault, the optical fiber pilot protection device can quickly respond to the situation that the switch successfully cuts off the fault line, so that the standby switch can be quickly switched on for the substation losing power due to the short-circuit fault, the power failure time can be shortened to the greatest extent, and the power failure loss can be reduced.
Some embodiments of the invention are further described below with reference to the accompanying drawings.
Referring to fig. 1, in an embodiment, an intelligent protection device for a power transmission line provided by 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 arranged corresponding to the first substation 121, and the first controllable switch unit 113 and the first controllable switch unit 114 are arranged corresponding to the first 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 substation 221, and the second controllable switch unit 212 and the second controllable switch unit 213 are arranged corresponding to the second substation 222;
the third controllable switch unit 30 is configured to: the first end is electrically connected with the first transmission line 10, and the second end is electrically connected with the second 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 the acquired electrical information of the first power transmission line 10, the position information of 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, the electrical information of the second power transmission line 20, the 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 act, the first power transmission line 10 and the second power transmission line 20 are enabled to normally work, wherein the protection device 115 is arranged corresponding to the first controllable switch unit 111, the protection device 116 is arranged corresponding to the first controllable switch unit 112, the protection device 117 is arranged corresponding to the first controllable switch unit 113, the protection device 118 is arranged corresponding to the first controllable switch unit 114, the protection device 40 is arranged corresponding to the third controllable switch unit 30, the protection device 214 is arranged corresponding to the second controllable switch unit 211, the protection device 215 is arranged corresponding to the second controllable switch unit 212, and the protection device 216 is arranged corresponding to the second controllable switch unit 213.
Specifically, it should be noted that the number of each element in the foregoing embodiments needs to be determined according to the number of actual substations, and the number in this application is only an example, where each substation corresponds to two controllable switch units, one is an incoming switch and one is an outgoing switch, functions of both are not specifically limited, and the number is determined according to an actual use condition. The third controllable switch unit 30 is set as a connection disconnection point, which may be any one of the first controllable switch unit and the second controllable switch unit, and the specific requirement is determined according to the actual use condition.
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 located, and can mutually transmit a switch operation instruction. When the protection device detects that the short-circuit fault information of the line in which the protection device is located needs to disconnect a corresponding switch, the protection device sends a tripping instruction to a 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 substation is in a voltage loss state, according to the position information of other shared protection devices and the corresponding power supply information, when the third controllable switch unit 30 where the contact disconnection point is located needs to be switched in, a switch closing instruction is sent to the protection device 40, and therefore the protection device 40 sends a closing instruction to the third controllable switch unit 30, and the third controllable switch unit 30 is switched in to access the standby power supply for the power loss substation.
In particular, each first controllable switch unit may be mainly a circuit breaker; each second controllable switch unit may be mainly a circuit breaker.
The intelligent protection device for the power transmission line provided by the embodiment does not need to be provided with the spare power automatic switching device independently, can directly utilize the existing optical fiber pilot protection device to control the switch to be switched on so as to realize the spare power automatic switching function, does not need extra wiring, and simultaneously has the functions of automatic tripping, cutting off and fault isolation under the condition of line fault, so that the existing resources are utilized to the maximum extent, the resource waste is reduced, and the installation and use cost is greatly reduced.
To further illustrate the specific working principle of the apparatus shown 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 safety of the second substation 221 and the second substation 222.
Specifically, the protection devices 214 and 215 on both sides of the fault point detect a large current of the line fault, quickly start a protection action, respectively send a trip instruction to the second controllable switch unit 211 and the second controllable switch unit 212, and the second controllable switch unit 211 and the second controllable switch unit 212 quickly trip to cut off the faulty transmission line, thereby protecting the safety of the internal devices of the second substation 221 and the second substation 222.
Specifically, as the second controllable switch unit 211 and the second controllable switch unit 212 trip, the second substation 221 powered by the second power supply loses the power supply instantaneously, at this time, the protection device 40 at the contact disconnection point detects that the bus of the second substation 221 is out of voltage, and meanwhile, the protection device 40 detects that the bus of the first substation 122 of the first power transmission line 10 is normally powered through the information shared by optical fiber communication, and the corresponding first controllable switch unit 114 is in the switching-on position, it is determined that the second substation 221 can be powered by the first power supply, and the protection device 40 sends a switching-on instruction to the third controllable switch unit 30 to control the third controllable switch unit 30 to switch on, so that the second substation 221 recovers the power supply.
To further illustrate the specific working principle of the apparatus shown 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 safety of the first substation 121 and the first substation 122.
Specifically, the protection devices 116 and 117 on both sides of the fault point detect a large current of the line fault, quickly start a protection action, respectively send a trip instruction to the first controllable switch unit 112 and the first controllable switch unit 113, and the first controllable switch unit 112 and the first controllable switch unit 113 quickly trip to cut off the fault transmission line, thereby protecting the safety of the internal devices of the first substation 121 and the first substation 122.
Specifically, due to tripping of the first controllable switch unit 112 and the first controllable switch unit 113, the first substation 122 originally powered by the first power supply loses the power supply instantaneously, at this time, the protection device 118 in the first substation 122 detects that the bus of the first substation 122 is out of voltage, meanwhile, the protection device 118 detects that the bus of the second substation 221 of the second power transmission line 20 is normally powered through the information shared by optical fiber communication, and the corresponding third controllable switch unit 30 is located at the switching-off position, it is determined that the first substation 122 can be powered by the second power supply, the protection device 118 sends a switch-on instruction to the protection device 40, the protection device 40 sends a switch-on instruction to the third controllable switch unit 30, the third controllable switch unit 30 is controlled to be switched on, and the first substation 122 recovers power supply from this.
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, wherein the operating mechanism 2000 is used for controlling the circuit breaker to be switched on or switched off according to an operation instruction; the main control module 1000 is electrically connected to the operating mechanism 2000, and is configured to send an operation instruction to the operating mechanism 2000 to open or close the circuit breaker according to the fault information of the power transmission line; 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 operating mechanism 2000 includes an outlet relay 2100 and a start relay 2200, the outlet relay 2100 is electrically connected to the main control module 1000 and the start relay 2200 for controlling the circuit breaker to be opened or closed, and the start relay 2200 is electrically connected to the main control module 1000 for providing power to the outlet relay 2100 after being turned on.
Specifically, the main control module 1000 includes an action DSP1100 and a start DSP1200, the action DSP1100 is electrically connected to both the start DSP1200 and the outlet relay 2100 for controlling the action of the outlet relay 2100, the start DSP1200 is electrically connected to the start relay 2200 and the network module 3000 for controlling the action of the start relay 2200 and receiving information from other protection devices from the network module 3000. Digital signals generated after analog signals of voltage and current sampled from a power transmission line pass through an AD conversion module and switch on-off state signals generated by a switch operation unit enter an action DSP1100 and a start DSP1200, data comparison is carried out inside the action DSP1100 and the start DSP1200, if data received by the action DSP1100 and the start DSP1200 are consistent, the protection device is considered to work normally, if data deviation received by the action DSP1100 and the start DSP1200 exceeds a preset range, the protection device is considered to work abnormally, and therefore an alarm is generated to remind workers to check the protection device.
Specifically, under the condition that the protection device is normally operated, if the protection device detects a fault current signal, the start DSP1200 will send a closing instruction to the start relay 2200 to control the start relay 2200 to close, and further turn on the power supply to the outlet relay 2100, at this time, the action DSP1100 sends a trip 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 implementing the line protection function.
If the protection device detects a bus voltage loss fault, the DSP1200 is started to generate a closing signal according to a fault voltage signal of the fault-side substation, a normal voltage signal of the standby-side substation, and switching-off state information of the third controllable switch unit 30, and the closing signal is sent to the protection device 40 through the network module 3000, and the protection device 40 controls the third controllable switch unit 30 to close, so as to access a standby power supply to the power-loss substation, or
The start DSP1200 controls the start relay 2200 to switch on according to the received switching-on instruction sent from the fault-side protection device to turn on the power supply for the outlet relay 2100, and at the same time, the action DSP1100 sends a switching-on instruction to the outlet relay 2100 to control the circuit breaker to switch on the backup power supply for the substation on the power-off side.
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, the LCD3200, the LED3300, the keyboard 3400, the printing module 3500, the clock module 3600, and the ethernet module 3700 are electrically connected to the CPU3100, each protection device forms a local area network through the ethernet module 3700, real-time data is shared between each other, which facilitates the main control module 1000 to perform real-time analysis and calculation, and accurately control the actions of each controllable switch unit, thereby ensuring the 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 can be implemented in other ways. The above-described system embodiments are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be implemented in a hardware form.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (10)

1. An intelligent protection device for a 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 powered by a second power supply and is in a normally-closed state;
the third controllable switch unit is configured to: the first end of the first power transmission line is electrically connected with the first power transmission line, and the second end of the first power transmission line 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.
2. The apparatus of claim 1, wherein the switch control information comprises switch trip control information, the fiber pilot protection device configured to:
and judging the fault position information of the power transmission line 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 fault position information of the power transmission line 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 fault position information of the power transmission line to trip and isolate the fault point.
3. The apparatus of claim 2, wherein the switch control information further comprises switch closing control information, the fiber pilot protection device configured to:
and judging real-time power supply source position information 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 real-time power supply source position information to control the third controllable switch unit to be closed, so that the power supply source indicated by the real-time power supply source position information supplies power through the third controllable switch unit.
4. The apparatus of any of claims 1-3, wherein the electrical information comprises at least one of voltage, current, and power.
5. The apparatus of any one of claims 1-3, wherein the first power transmission line comprises 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 wire inlet end and the wire outlet end of the first transformer substation.
6. The apparatus of any one of claims 1-3, wherein the second power transmission line comprises a plurality of second substations;
and at least one second transformer substation is provided with two second controllable switch units which are respectively positioned at the wire inlet end and the wire outlet end of the second transformer substation.
7. The apparatus of any of claims 1-3, wherein the fiber pilot protection device comprises a plurality of communicatively interconnected protection devices;
the sum of the number of the first controllable switch units, the number of the second controllable switch units and the number of 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.
8. The apparatus of claim 7, wherein each of the protection devices are interconnected via fiber optic communication.
9. A device according to any of claims 1-3, characterized in that at least one of said first controllable switch unit, said second controllable switch unit and said third controllable switch unit comprises a circuit breaker.
10. An intelligent protection method for a power transmission line, the method being implemented by the apparatus of any one of claims 1 to 9, the method further comprising:
acquiring the electrical information of the first power transmission line, the position information of the first controllable switch unit, the electrical information of the second power transmission line and the position information of the second controllable switch unit;
generating switch control information according to the electrical information of the first power transmission line, the position information of the first controllable switch unit, the electrical 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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