CN111082400A - Failure protection system and method based on wireless network and station domain information - Google Patents
Failure protection system and method based on wireless network and station domain information Download PDFInfo
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- CN111082400A CN111082400A CN201911132920.8A CN201911132920A CN111082400A CN 111082400 A CN111082400 A CN 111082400A CN 201911132920 A CN201911132920 A CN 201911132920A CN 111082400 A CN111082400 A CN 111082400A
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
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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
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
- H02H1/0069—Details of emergency protective circuit arrangements concerning transmission of signals by means of light or heat rays
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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
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
- H02H1/0084—Details of emergency protective circuit arrangements concerning transmission of signals by means of pilot wires or a telephone network; watching of these wires
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Abstract
The invention discloses a failure protection system and a method based on wireless network and station domain information, wherein the system comprises a protection host machine and a plurality of protection sub-machines, and each protection sub-machine corresponds to a string in a multi-circuit breaker wiring form and is respectively connected with the protection host machine through a wireless network; each protection submachine acquires related analog quantity and switching value on a corresponding string and sends the related analog quantity and the switching value to the protection mainframe; the protection host machine collects bus protection tripping command information in the station, and judges failures of related strings and dead zone faults by combining information sent by all protection sub-machines, when a certain string is judged to have faults, the protection host machine transmits the tripping information to the corresponding protection sub-machine, and the corresponding protection sub-machine confirms that the phase-hopping circuit breaker is turned off. The invention can realize the quick and reliable removal of the failure of the breaker and the dead zone fault, and simultaneously can simplify the network topology structure of the transformer substation and save the construction cost of the transformer substation.
Description
Technical Field
The invention belongs to the technical field of relay protection, and particularly relates to a failure protection system and method based on wireless network and station domain information.
Background
At present, the electric network of China has basically formed a new pattern of extra-high voltage alternating current and direct current series-parallel connection, in the alternating current and direct current series-parallel connection electric network, alternating current and direct current not only support each other, but also are mutually coupled and interacted, and the balanced situation of the structural development of the alternating current and direct current and the alternating current and direct current can deeply influence the operation characteristics of the electric network. The commutation failure is used as a common fault of a direct-current power transmission system, and can cause adverse consequences such as reduction of direct-current voltage and reduction of direct-current transmission power, and the continuous commutation failure even can cause direct-current locking, thereby seriously affecting the stable operation of an alternating-current and direct-current interconnection system. The phase change failure is mainly caused by that the voltage of a current conversion bus at the inversion side is reduced due to the fault of an alternating current system, if the fault is quickly removed, some phase change failures can be automatically recovered, but if two or more continuous phase change failures occur, a converter valve can be locked, a power transmission channel of a direct current system is interrupted, and even a power grid is broken down under severe conditions. The recovery time of one commutation failure is about 200ms, when a circuit breaker failure or dead zone failure occurs in a power grid alternating current system, the failure (dead zone) protection needs to be set for long time delay to prevent protection misoperation, after failure judgment, in order to isolate a failure point, the related circuit breaker of the protection tripping string, the related adjacent circuit breaker of the bus differential protection tripping string and the far-tripping circuit opposite side through a circuit protection device need to be passed through, wherein both the bus differential protection and the circuit protection tripping have longer time delay when the circuit breaker is turned off, in addition, the optical fiber channel of the circuit has channel delay, the failure (dead zone) failure removal time is further prolonged, and by integrating the links, the failure (dead zone) failure removal time is basically greater than 400ms after the failure, multiple direct current simultaneous continuous commutation failure can be caused, and the power system instability can be caused.
For the above problems, if a station area protection mode is adopted, failure and dead zone fault judgment by integrating all-station information is a good solution, so that the fault judgment reliability can be improved, and the fault removal time can be shortened. However, in the existing station area protection, information is acquired in a networking mode, each submachine is used as an acquisition unit to send the acquired information to a central switch through an optical fiber for gathering, and a station area protection host acquires all-station information from the central switch and then performs related logic judgment; in addition, the failure (dead zone) fault relates to the fact that when the line interval is needed to jump far to the opposite side, inter-station domain protection needs to transmit information, if communication is conducted according to the existing line protection interconnection mode, a large number of optical fiber interfaces are added to the station domain protection, meanwhile, communication networks and communication equipment laid among the transformer stations are increased accordingly, the communication networks and the communication equipment are limited by a private protocol of information receiving and sending of optical fiber channels of various manufacturers, a large number of transformer stations need to be provided with the same-manufacturer station domain failure (dead zone) protection, coupling relations among different transformer stations are serious, transformer station device purchasing and later-stage operation maintenance are not facilitated, and reasonable solutions are urgently needed.
Disclosure of Invention
Aiming at the problems, the invention provides a failure protection system and a failure protection method based on wireless network and station domain information, which can realize the quick and reliable removal of breaker failure and dead zone faults, and simultaneously can simplify the network topological structure of a transformer substation and save the construction cost of the transformer substation.
In order to achieve the technical purpose and achieve the technical effects, the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a failure protection system based on wireless network and station domain information, comprising:
protecting the host;
each protection sub-machine corresponds to a string in a multi-circuit breaker wiring mode and is respectively connected with the protection main machine through a wireless network;
each protection submachine acquires related analog quantity and switching value on a corresponding string and sends the related analog quantity and the switching value to the protection mainframe; the protection host machine collects bus protection tripping command information in the station, and judges failures of related strings and dead zone faults by combining information sent by all protection sub-machines, when a certain string is judged to have faults, the protection host machine transmits the tripping information to the corresponding protection sub-machine, and the corresponding protection sub-machine confirms that the phase-hopping circuit breaker is turned off.
Optionally, when the number of the protection hosts is greater than 1 and each protection host corresponds to one substation, if there is line interval interconnection between two substations, the protection hosts corresponding to the two substations are connected through a wireless network.
Optionally, the protection host collects bus protection tripping command information in the station and performs local judgment by combining the information sent by each protection sub-machine, when a circuit breaker failure or dead zone fault related to a line interval occurs, the fault side protection host sends the tripping information to the opposite side protection host through a wireless network, and after receiving the information, the opposite side protection host confirms whether to send a tripping command to the related protection sub-machine or not by combining a local judgment result of the opposite side protection host.
Optionally, the analog quantity collected by the protection sub-machine includes a series of three-phase currents of each circuit breaker and a series of three-phase voltages at intervals; the switching value collected by the protection sub-machine comprises a three-phase tripping position corresponding to each series of circuit breakers, a split-phase tripping command corresponding to a line interval and a three-phase tripping command corresponding to a transformer interval.
Optionally, the ratio of each protection host to each protection slave is 1: and N, when the number of the protection sub-machines is larger than N, the number of the protection main machines is larger than 1, and the protection main machines are connected through a wireless network.
In a second aspect, the present invention provides a failure protection method based on wireless network and station domain information, including:
collecting related analog quantity and switching value on the corresponding string by using each protection submachine, and sending the related analog quantity and the switching value to the protection mainframe;
the protection host is used for collecting bus protection tripping command information in the station and carrying out failure and dead zone fault judgment on related strings by combining information sent by each protection submachine, when the fault is judged to occur, the protection host transmits the tripping information to the corresponding protection submachine, and the corresponding protection submachine is used for determining and then tripping off the circuit breaker.
Optionally, the method further comprises:
each protection sub-machine is numbered in a string, the number information, the analog quantity and the switching value acquisition information form frame data, the frame data is coded by the protection sub-machines to form coded information, and the coded information is sent to the corresponding protection main machine through a wireless network;
the method comprises the following steps of collecting trip protection command information of a bus in a station by using a protection host machine, and judging failures and dead zone faults of related strings by combining the information sent by each protection submachine, and specifically comprises the following steps:
the protection host is used for collecting bus protection tripping command information in the station, the corresponding strings of the protection submachine are identified by combining the number information sent by the protection submachine, and failure and dead zone faults are judged according to the analog quantity and the switching value sent by the corresponding protection submachine.
Optionally, the method further comprises:
each protection sub-machine is numbered in a string, the opposite side identification codes corresponding to the line intervals are arranged, the number information, the opposite side identification codes corresponding to the line intervals, the analog quantity and the switching value acquisition information form a frame of data, the data are coded by the protection sub-machines to form coded information, and the coded information is sent to the corresponding protection main machines through a wireless network;
when the number of the protection main machines is larger than 1 and each protection main machine corresponds to one transformer substation respectively, if a line interval interconnection exists between two transformer substations, the protection main machines acquire in-station bus protection tripping command information and perform local judgment by combining information sent by each protection sub-machine, when a circuit breaker failure or dead zone fault related to the line interval occurs, the fault side protection main machine sends the tripping information to the opposite side protection main machine through a wireless network, and the opposite side protection main machine confirms whether to issue a tripping command to the related protection sub-machine or not by combining the local judgment result of the fault side protection main machine after receiving the information.
Optionally, the trip information is a trip matrix, and the trip matrix is obtained based on the principle of isolation of failures and dead zone faults; the isolation principle comprises: 1) distinguishing which string the fault occurs in; 2) distinguishing whether the fault occurs in a main transformer interval or a line interval; 3) distinguishing whether the corresponding serial connection line form is a complete string or an incomplete string; 4) distinguishing which bus the fault point is close to; 5) it is distinguished whether the fault point is close to an edge breaker or a medium breaker.
Optionally, the phase-jump circuit breaker is turned off after being confirmed by the corresponding protection sub-machine, specifically:
and the corresponding protection submachine switches off the circuit breaker after being determined by the error-proof discrimination.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention comprehensively judges the failure and the dead zone fault based on the station domain information, can realize the quick and reliable removal of the failure of the circuit breaker and the dead zone fault, and simultaneously can simplify the network topological structure of the transformer substation and save the construction cost of the transformer substation.
(2) The failure protection method based on the wireless network and the station domain information is easy to realize, can be realized by modifying the existing station domain protection, can also be realized by independently configuring the station domain failure (dead zone) protection, and has flexible and various realization modes.
(3) According to the failure protection system based on the wireless network and the station domain information, the in-station protection host machine and the protection sub-machine are connected through wireless network communication, so that the dependence of protection equipment on related communication equipment such as optical fiber quality and switch performance is reduced, a network topology structure is simplified, the use of communication related material equipment such as optical fibers and switches is reduced, and the construction cost of a transformer substation is saved.
(4) According to the wireless network and station domain information-based failure protection system, the inter-station protection host machine adopts the wireless network for information interaction, so that the coupling relation of different transformer substations to the configuration requirements of products of the same manufacturer is eliminated, the resource consumption of the device is reduced, and the stable operation of the device is facilitated.
(5) The invention accelerates the removal time of failure and dead zone faults, can effectively avoid multiple direct current commutation failures and improves the stability of a power system.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a failure protection system based on wireless network and station domain information according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
Example 1
The embodiment of the invention provides a failure protection system based on wireless network and station domain information, which is suitable for transformer substations in a multi-circuit breaker wiring mode area, and comprises a protection host machine and a plurality of protection sub machines as shown in figure 1;
each protection sub-machine corresponds to a string in a multi-circuit breaker wiring mode and is respectively connected with the protection main machine through a wireless network; the multi-breaker wiring forms comprise 3/2, 4/3 and other breaker wiring forms; in general, a string corresponds to a plurality of circuit breakers and a plurality of intervals, for example, a string corresponds to three to four circuit breakers, and each two circuit breakers correspond to an interval, which may be a line interval (i.e., line protection in fig. 1) or a main transformer interval (i.e., main transformer protection in fig. 1).
Each protection submachine acquires related analog quantity and switching value on a corresponding string and sends the related analog quantity and the switching value to the protection mainframe; in the specific implementation process, each protection submachine is provided with a wireless transceiving module for coding the acquired information quantity (related analog quantity and switching value) and then sending the coded information quantity to the corresponding protection mainframe through a wireless network in a station; in a specific implementation manner of the embodiment of the present invention, the analog quantity collected by the protection sub-machine includes a three-phase current corresponding to a string of each circuit breaker and a three-phase voltage corresponding to a string of each circuit breaker at intervals; the switching value collected by the protection sub-machine comprises a three-phase tripping position corresponding to each series of circuit breakers, a split-phase tripping command corresponding to a line interval and a three-phase tripping command corresponding to a transformer interval; the numbering mode of the protection sub-machine is as follows: numbering according to a string, protecting the submachine in the same transformer substation to be unique, realizing the numbering in a constant value mode, and setting according to actual conditions; and the set number information, the analog quantity acquisition information and the switching value acquisition information form a frame of data, the frame of data is coded by the protection submachine to form coded information, and the coded information is sent to the host through a wireless network.
The protection host collects bus protection tripping command information in the station, and performs failure and dead zone fault judgment on related strings by combining information sent by each protection submachine, when a certain string is judged to have a fault, the protection host transmits tripping information to the corresponding protection submachine, and the corresponding protection submachine confirms that the phase-hopping circuit breaker is turned off; in the specific implementation process, the protection host machine receives and decodes the messages sent by each protection sub-machine through the configured wireless transceiving module, and judges the failure and dead zone faults of the circuit breaker according to the protection sub-machine information obtained after decoding and the collected bus protection action information (namely, the protection host machine collects bus protection tripping command information in a station, identifies the corresponding string of the protection sub-machine by combining the serial number information sent by the protection sub-machine, and judges the failure and dead zone faults according to the analog quantity and the switching quantity sent by the corresponding protection sub-machine), when a certain string is judged to have faults, the protection host machine transmits the tripping information to the corresponding protection sub-machine, and the corresponding protection sub-machine performs phase jump and circuit breaker after the anti-error confirmation criterion. In specific implementation, the protection host machine performs conflict detection on the numbers of the protection sub-machines, and when abnormal numbers appear, the protection host machine sends out alarm information to eliminate the influence caused by abnormal setting of the numbers of the sub-machines; the protection host can adopt half-wave difference and zero-crossing discrimination logic to eliminate the influence of CT trailing on failure and dead zone protection logic.
In a specific implementation manner of the embodiment of the present invention, the trip information is a trip matrix, and is set based on an isolation principle of a failure and a dead zone fault, where the isolation principle is based on the following five points: 1) distinguishing which string the fault occurs in; 2) distinguishing whether the fault occurs in a main transformer interval or a line interval; 3) distinguishing whether the corresponding serial connection line form is a complete string or an incomplete string; 4) distinguishing which bus the fault point is close to; 5) it is distinguished whether the fault point is close to an edge breaker or a medium breaker.
In a specific implementation manner of the embodiment of the present invention, the error prevention criterion is specifically: the protection starting is combined with a low-voltage criterion, and when PT disconnection occurs, the anti-error criterion is simplified into protection starting.
In order to prevent the situation that the space in the station is too large and the efficiency of the protection host is insufficient due to too large calculation amount, the protection host in the invention adopts a centralized configuration mode, in a specific implementation mode of the embodiment of the invention, a configuration mode that N strings of protection sub-machines correspond to one protection host is adopted (namely the ratio of each protection host to each protection sub-machine is 1: N), the value of N is generally not more than 11, when the number of the protection sub-machines is more than N, the protection host is set according to the ratio, the number of the protection host is more than 1, and the protection hosts are connected through a wireless network. When the number of the protectors is smaller than or equal to N, only one protection host is arranged in one transformer substation; when the number of protectors is larger than N, the number of protectors in one substation needs to be increased according to 1: and N is matched with a proper number of protection hosts, and the protection hosts are connected through a wireless network.
Example 2
Based on example 1, the inventive example differs from example 1 in that:
when the number of the protection hosts is larger than 1 and each protection host corresponds to one transformer substation, if line interval interconnection exists between two certain transformer substations, the protection hosts corresponding to the two transformer substations are connected through a wireless network.
The protection host collects bus protection tripping command information in the station and performs local judgment by combining the information sent by each protection submachine, when a circuit breaker failure or dead zone fault related to a line interval occurs, the fault side protection host sends the tripping information to the opposite side protection host through a wireless network, and after receiving the information, the opposite side protection host confirms whether to send a tripping command to the related protection submachine or not by combining the local judgment result of the opposite side protection host. The numbering mode of the protection sub-machine is as follows: numbering according to a string, and arranging the identification codes of the opposite side corresponding to the line interval, wherein the numbering is realized in a constant value mode, and the setting is required according to the actual condition; the set number information, the analog quantity acquisition information and the switching value acquisition information form frame data, the frame data is coded by the protection submachine to form coded information, and the coded information is sent to the host through a wireless network; and the opposite-side protection host machine confirms the opposite-side identification code through the host machine according to the line interval sent by the protection sub machine.
The on-site criteria adopted by the protection host comprise: current variance, zero, negative sequence current, low power, low active, low power factor, whether the fault is within range of the backup segment, etc.
Example 3
Based on the same inventive concept as embodiment 1, the embodiment of the present invention provides a failure protection method based on wireless network and station domain information, which specifically includes the following steps:
the method comprises the following steps that (1) relevant analog quantity and switching value on corresponding strings are collected by all protection submachine and sent to a protection host;
and (2) collecting bus protection tripping command information in the station by using the protection host, carrying out failure and dead zone fault judgment on related strings by combining information sent by each protection submachine, transmitting tripping information to the corresponding protection submachine by using the protection host after judging that a fault occurs, and switching off the circuit breaker after confirming by the corresponding protection submachine.
In a specific implementation manner of the embodiment of the present invention, the method further includes:
each protection sub-machine is numbered in a string, the number information, the analog quantity and the switching value acquisition information form frame data, the frame data is coded by the protection sub-machines to form coded information, and the coded information is sent to the corresponding protection main machine through a wireless network;
the method comprises the following steps of collecting trip protection command information of a bus in a station by using a protection host machine, and judging failures and dead zone faults of related strings by combining the information sent by each protection submachine, and specifically comprises the following steps:
the protection host is used for collecting bus protection tripping command information in the station, the corresponding strings of the protection submachine are identified by combining the number information sent by the protection submachine, and failure and dead zone faults are judged according to the analog quantity and the switching value sent by the protection submachine.
In a specific implementation manner of the embodiment of the present invention, the trip information is a trip matrix, and the trip matrix is obtained based on an isolation principle of a failure and a dead zone fault; the isolation principle comprises: 1) distinguishing which string the fault occurs in; 2) distinguishing whether the fault occurs in a main transformer interval or a line interval; 3) distinguishing whether the corresponding serial connection line form is a complete string or an incomplete string; 4) distinguishing which bus the fault point is close to; 5) it is distinguished whether the fault point is close to an edge breaker or a medium breaker.
In a specific implementation manner of the embodiment of the present invention, the phase-trip circuit breaker is determined by the corresponding protection sub-machine, and specifically includes:
and the corresponding protection submachine switches off the circuit breaker after being determined by the error-proof discrimination.
Further, in a specific implementation manner of the embodiment of the present invention, the error prevention criterion is specifically: the protection starting is combined with a low-voltage criterion, and when PT disconnection occurs, the anti-error criterion is simplified into protection starting.
Example 4
The embodiment of the present invention is different from embodiment 3 in that the method further includes:
each protection sub-machine is numbered in a string, the pair of side identification codes corresponding to the line intervals are arranged, the number information, the pair of side identification codes corresponding to the line intervals, the analog quantity and the switching value acquisition information form a frame of data, the sub-machines encode the data to form encoding information, and the encoding information is sent to the corresponding protection main machine through a wireless network;
when the number of the protection main machines is larger than 1 and each protection main machine corresponds to one transformer substation respectively, if a line interval interconnection exists between two transformer substations, the protection main machines acquire in-station bus protection tripping command information and perform local judgment by combining information sent by each protection sub-machine, when a circuit breaker failure or dead zone fault related to the line interval occurs, the fault side protection main machine sends the tripping information to the opposite side protection main machine through a wireless network, and the opposite side protection main machine confirms whether to issue a tripping command to the related protection sub-machine or not by combining the local judgment result of the fault side protection main machine after receiving the information. And the opposite-side protection host machine confirms the opposite-side identification code through the host machine according to the line interval sent by the protection sub machine.
In a specific implementation manner of the embodiment of the present invention, the local criteria adopted by the protection host include: current variance, zero, negative sequence current, low power, low active, low power factor, whether the fault is within range of the backup segment, etc.
The embodiment of the invention is suitable for the situation that when the number of the protection hosts is more than 1 and each protection host corresponds to one transformer substation, if the two transformer substations are connected with each other at intervals, the protection hosts corresponding to the two transformer substations are connected with each other through a wireless network.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A failsafe system based on wireless network and station domain information, comprising:
protecting the host;
each protection sub-machine corresponds to a string in a multi-circuit breaker wiring mode and is respectively connected with the protection main machine through a wireless network;
each protection submachine acquires related analog quantity and switching value on a corresponding string and sends the related analog quantity and the switching value to the protection mainframe; the protection host machine collects bus protection tripping command information in the station, and judges failures of related strings and dead zone faults by combining information sent by all protection sub-machines, when a certain string is judged to have faults, the protection host machine transmits tripping information to the corresponding protection sub-machine, and the corresponding protection sub-machine confirms that the phase-hopping circuit breaker is turned off.
2. The malfunction protection system based on wireless network and station area information of claim 1, wherein: when the number of the protection hosts is larger than 1 and each protection host corresponds to one transformer substation, if line interval interconnection exists between two certain transformer substations, the protection hosts corresponding to the two transformer substations are connected through a wireless network.
3. The malfunction protection system based on wireless network and station area information of claim 3, wherein: the protection host collects bus protection tripping command information in the station and performs local judgment by combining the information sent by each protection submachine, when a circuit breaker failure or dead zone fault related to a line interval occurs, the fault side protection host sends the tripping information to the opposite side protection host through a wireless network, and after receiving the information, the opposite side protection host confirms whether to send a tripping command to the related protection submachine or not by combining the local judgment result of the opposite side protection host.
4. The malfunction protection system based on wireless network and station area information of claim 2, wherein: the analog quantity collected by the protection sub-machine comprises a three-phase current corresponding to a string of each circuit breaker and a three-phase voltage corresponding to a string of each interval; the switching value collected by the protection sub-machine comprises a three-phase tripping position corresponding to each series of circuit breakers, a split-phase tripping command corresponding to a line interval and a three-phase tripping command corresponding to a transformer interval.
5. The malfunction protection system based on wireless network and station area information of claim 1, wherein: the proportion of each protection host machine to each protection sub machine is 1: and N, when the number of the protection sub-machines is larger than N, the number of the protection main machines is larger than 1, and the protection main machines are connected through a wireless network.
6. A failure protection method based on wireless network and station domain information is characterized by comprising the following steps:
collecting related analog quantity and switching value on the corresponding string by using each protection submachine, and sending the related analog quantity and the switching value to the protection mainframe;
the protection host is used for collecting bus protection tripping command information in the station and carrying out failure and dead zone fault judgment on related strings by combining information sent by each protection submachine, when the fault is judged to occur, the protection host transmits the tripping information to the corresponding protection submachine, and the corresponding protection submachine is used for determining and then tripping off the circuit breaker.
7. The wireless network and station domain information based failure protection method of claim 6, wherein the method further comprises:
each protection sub-machine is numbered in a string, the number information, the analog quantity and the switching value acquisition information form frame data, the frame data is coded by the protection sub-machines to form coded information, and the coded information is sent to the corresponding protection main machine through a wireless network;
the method comprises the following steps of collecting trip protection command information of a bus in a station by using a protection host machine, and judging failures and dead zone faults of related strings by combining the information sent by each protection submachine, and specifically comprises the following steps:
the protection host is used for collecting bus protection tripping command information in the station, the corresponding strings of the protection submachine are identified by combining the number information sent by the protection submachine, and failure and dead zone faults are judged according to the analog quantity and the switching value sent by the corresponding protection submachine.
8. The wireless network and station domain information based failure protection method of claim 7, wherein the method further comprises:
each protection sub-machine is numbered in a string, the opposite side identification codes corresponding to the line intervals are arranged, the number information, the opposite side identification codes corresponding to the line intervals, the analog quantity and the switching value acquisition information form a frame of data, the data are coded by the protection sub-machines to form coded information, and the coded information is sent to the corresponding protection main machines through a wireless network;
when the number of the protection main machines is larger than 1 and each protection main machine corresponds to one transformer substation respectively, if a line interval interconnection exists between two transformer substations, the protection main machines acquire in-station bus protection tripping command information and perform local judgment by combining information sent by each protection sub-machine, when a circuit breaker failure or dead zone fault related to the line interval occurs, the fault side protection main machine sends the tripping information to the opposite side protection main machine through a wireless network, and the opposite side protection main machine confirms whether to issue a tripping command to the related protection sub-machine or not by combining the local judgment result of the fault side protection main machine after receiving the information.
9. The failure protection method based on wireless network and station domain information as claimed in claim 6, wherein: the trip information is a trip matrix which is obtained based on the principle of isolation of failure and dead zone faults;
the isolation principle comprises: 1) distinguishing which string the fault occurs in; 2) distinguishing whether the fault occurs in a main transformer interval or a line interval; 3) distinguishing whether the corresponding serial connection line form is a complete string or an incomplete string; 4) distinguishing which bus the fault point is close to; 5) it is distinguished whether the fault point is close to an edge breaker or a medium breaker.
10. The failure protection method based on wireless network and station domain information as claimed in claim 6, wherein: the phase-jump circuit breaker is determined by the corresponding protection submachine and specifically comprises the following steps:
and the corresponding protection submachine switches off the circuit breaker after being determined by the error-proof discrimination.
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Cited By (3)
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| CN112398099A (en) * | 2020-10-26 | 2021-02-23 | 中国南方电网有限责任公司超高压输电公司梧州局 | Layered wide area system and device based on low-delay wireless communication |
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| CN116247628B (en) * | 2022-12-27 | 2023-12-05 | 国网河北省电力有限公司石家庄市栾城区供电分公司 | Circuit trip stabilizing device and use method |
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