CN113964801A - Distance protection optimization method and device for high-voltage line protection device - Google Patents
Distance protection optimization method and device for high-voltage line protection device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
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Abstract
The application relates to the field of relay protection of power systems, in particular to a distance protection method for a high-voltage line protection device, wherein the protection device comprises an energy storage unit, and the method comprises the following steps: receiving a power-off state signal sent by a protection device of an opposite terminal; judging whether the protection device is in a power-off state or not; and if the protection device is not in the power-off state, optimizing the distance protection of the protection device based on the power-off state signal.
Description
Technical Field
The application relates to the field of relay protection of power systems, in particular to a distance protection optimization method and device for a high-voltage line protection device.
Background
At present, with the construction of high-voltage and ultra-high voltage transmission lines, the perfect matching and setting of line distance protection are increasingly difficult. Generally, in a system, control is performed according to a distance protection setting principle, which results in a long operation time of distance protection, for example, the operation time of a distance protection end section is generally more than 3 s. However, when the line with weaker relation is artificially selected and mismatched, the action time and the sensitivity cannot guarantee the adjacent line, and the main protection of the line is more depended on. If the line protection device in the transformer substation loses power, the main protection is lost at the interval, and if the whole substation loses power, the transformer substation losing power loses the near backup protection. After the protection device loses power, distance protection cannot be started or action response is slow according to the existing mode, so that the fault range is expanded, and the network operation safety is threatened.
Aiming at the problem of power loss of the protection device, the requirements of complete matching and rapid fault removal cannot be met from the traditional fixed value matching method. An alternative solution is to shut down primary equipment for a power-loss interval or a substation and adjust a distance protection fixed value of corresponding line protection for primary equipment which cannot be shut down to realize backup protection optimization, but this method may cause large-area load transfer of a power grid, and the reliability and the rapidity of distance protection removal during a fault are affected. The other solution is to establish wide area or station area protection, and to improve the reliability and coordination relationship of line protection by establishing a new information transmission channel, but the method has poor equipment cost and economic benefit.
Disclosure of Invention
Based on this, the present application provides a distance protection optimization method and device for a high voltage line protection device. Whether the protection device is in a power-off state or not is judged by monitoring the working condition of the energy storage unit in the protection device, and when the protection device is in the power-off state, a power-off state signal is generated and continuously sent to the protection device at the opposite end. And when the protection device is not in a power-off state, namely normally works, receiving a power-off state signal sent by the power-off protection device, and optimizing distance protection.
According to an aspect of the present application, a distance protection method for a high voltage line protection device is presented, the protection device comprising an energy storage unit, the method comprising:
receiving a power-off state signal sent by a protection device of an opposite terminal;
judging whether the protection device is in a power-off state or not;
and if the protection device is not in the power-off state, optimizing the distance protection of the protection device based on the power-off state signal.
According to some embodiments, the aforementioned method further comprises: and if the protection device is in a power-off state, generating and continuously sending the power-off state signal to the protection device at the opposite end.
According to some embodiments, the aforementioned method further comprises: and judging whether the protection device is in a power-off state or not based on the working condition of the energy storage unit and the external power supply input condition of the protection device.
According to some embodiments, the energy storage unit comprises a capacitor or a battery.
According to some embodiments, the capacitive capacity of the energy storage unit is determined as:
wherein C is the capacitance of the energy storage unit, V0Is the initial operating voltage, V, of the energy storage unit1The energy storage unit is a cut-off working voltage of the energy storage unit, I is a load current of the energy storage unit, and t is a continuous discharge time of the energy storage unit.
According to some embodiments, the aforementioned method further comprises: judging whether the energy storage unit is in a discharging state: setting a power threshold fixed value of the energy storage unit; when the discharge power of the energy storage unit is larger than the power threshold fixed value, the energy storage unit is judged to be in a discharge state; judging whether an external power supply of the protection device has current input; if the energy storage unit is in a discharging state and an external power supply of the protection device does not have current input, judging that the protection device is in a power-off state, and otherwise, judging that the protection device is not in the power-off state.
According to some embodiments, the aforementioned method further comprises: when the power failure state signal is received, waiting for an energy storage discharge delay, and judging whether a pilot channel abnormal signal exists or not; if the pilot channel abnormal signal exists, triggering a distance protection optimization signal, shortening the action time of distance protection, and/or increasing far backup distance protection, wherein the protection range of the far backup distance protection covers the high-voltage line where the protection device is located, and an adjacent high-voltage line or other electrical elements.
According to some embodiments, the aforementioned method further comprises: the action time of the distance protection II section is shortened; and the action time of the distance protection III section is shortened.
According to an aspect of the application, a distance protection device for a high voltage line protection device is proposed, the protection device comprising an energy storage unit, the device comprising: the power failure judging module is used for judging whether the protection device is in a power failure state or not; the signal sending module is used for generating and continuously sending a power-off state signal to the protection device at the opposite end if the protection device is in a power-off state; and the distance protection optimization module is used for receiving the power-off state signal and optimizing the distance protection if the protection device is not in the power-off state.
According to an aspect of the present application, a protection system for a high voltage line is provided, the protection system including a first protection device and a second protection device, the first protection device and the second protection device being protection devices at two ends of the high voltage line at the same section, the method including: the first protection device is configured to generate and continuously send a power-off state signal to the second protection device when the first protection device is in a power-off state; the second protection device is configured to receive the power loss state signal and optimize distance protection of the second protection device when the second protection device is not in a power loss state.
According to some embodiments, the aforementioned high voltage line protection system further comprises: the method comprises the following steps of shortening the action time of distance protection of the second protection device, and/or adding far backup distance protection for the second protection device, wherein the protection range of the far backup distance protection covers the same section of high-voltage line and adjacent high-voltage lines or other electric elements.
According to an aspect of the present application, an electronic device is provided, which includes: one or more processors; storage means for storing one or more programs; when executed by the one or more processors, cause the one or more processors to implement a method as in any preceding claim.
The beneficial effect of this application:
according to some embodiments, the energy storage module of the protection device can continuously send out a power-off state signal to the protection device at the opposite end after the protection device is powered off, so that when the protection device breaks down, the fault state of the protection device can be timely captured by other normally working protection devices in a line, and therefore corresponding faults can be carried out.
According to some embodiments, after the protection device which normally works in the application receives the power-off state signals sent by other power-off protection devices, the action time of distance protection can be shortened, a long backup distance protection is newly added, the fault cutting speed can be increased, the protection range can be expanded, and the reliability and the quick-acting performance of distance protection can be further improved.
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 exceeding the protection scope of the present application.
Fig. 1 shows a schematic diagram of a high voltage power transmission system for a distance protection optimization method for a high voltage line protection device according to an embodiment of the application.
Fig. 2 shows a flow chart of a distance protection optimization method for a high voltage line protection device according to an embodiment of the present application.
Fig. 3 shows a decision flow diagram of a distance protection optimization method for a high voltage line protection device according to an embodiment of the present application.
Fig. 4 shows a decision flow diagram of another distance protection optimization method for a high-voltage line protection device according to an embodiment of the present application.
Fig. 5 shows a block diagram of a distance protection device for a high voltage line protection device according to an embodiment of the present application.
Fig. 6 shows a block diagram of a high voltage line protection system according to an embodiment of the present application.
FIG. 7 shows a block diagram of an electronic device according to an example embodiment.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments 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, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other means, components, materials, devices, or the like. In such cases, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
In the existing line protection of high-voltage and ultra-high-voltage transmission lines, the distance protection of a protection device executes a protection procedure according to a set principle. The method specifically comprises the steps of respectively carrying out fault processing on fault points at different positions on a high-voltage line by adopting different delays according to the arrangement of a section I, a section II and a section III of distance protection in the industry. However, this method may result in a long action time of the distance protection, for example, the action time of the distance protection end segment is generally more than 3 s. And when the line protection device in the transformer substation loses power, the main protection is lost at the interval, and if the whole substation loses power, the transformer substation losing power loses the near backup protection.
In order to solve the problems, the application provides a distance protection optimization method for a high-voltage line protection device. And further when the protection device is judged to be power-off, the power-off protection device sends a power-off state signal to the protection device at the opposite end by using the electric quantity stored by the self energy storage unit. And after receiving the power-off state signal, the protection device at the opposite end optimizes the distance protection of the protection device. The details will be described later.
Fig. 1 shows a schematic diagram of a high voltage power transmission system for a distance protection optimization method for a high voltage line protection device according to an embodiment of the application.
The complete high-voltage transmission line is generally formed by connecting multiple sections of high-voltage lines, and two ends of each section of high-voltage line are respectively provided with a protection device for detecting faults occurring on the high-voltage line and executing corresponding line protection measures according to the positions of the faults and the like. As shown in fig. 1, QF1 and QF2 are two-terminal breakers of a high-voltage line between a station a and a station B, and protection devices are installed at the locations of QF1 and QF2, where QF is a breaker.
And two adjacent sections of high-voltage lines are connected by a substation, so that the substation located in the middle of the power transmission line is usually configured with 2 protection devices respectively used for the two sections of high-voltage lines. As shown in fig. 1, station a, station B and station C are all substations, and taking station B as an example, two protection devices associated with QF2 and QF3, namely protection device 2 and protection device 3.
For each protection device, the range of the power transmission line protected by the protection device is within the range from the positive direction (pointing to the line) of the protection device to the distance end setting value. Taking QF1 as an example, the protection device at the position is protected by a near backup protection range (the near backup ensures sensitivity of the end fault of the line) or a far backup protection range (sensitivity of the fault of the next-stage adjacent electrical equipment) in a dotted line frame in fig. 1.
When the protection device loses power, if the protection device is not timely and effectively processed, and the condition of high-voltage line fault occurs again, the fault of the high-voltage line used for power transmission is further not timely processed, so that the conditions of fault amplification, damage to power transmission equipment and the like can be caused.
Fig. 2 shows a flow chart of a distance protection optimization method for a high voltage line protection device according to an embodiment of the present application.
As shown in fig. 2, in S201, a power loss state signal sent by a protection device on the opposite end is received.
The complete high-voltage transmission line is generally formed by connecting multiple sections of high-voltage lines, and two ends of each section of high-voltage line are respectively provided with a protection device for detecting faults occurring on the high-voltage line and executing corresponding line protection measures according to the positions of the faults and the like.
When the protection device loses power, if the protection device is not timely and effectively processed, and the condition of high-voltage line fault occurs again, the fault of the high-voltage line used for power transmission is further not timely processed, so that the conditions of fault amplification, damage to power transmission equipment and the like can be caused.
In the solution of the present application, according to an embodiment, the protection device may determine whether itself is in a power-off state to perform a corresponding processing operation.
According to an embodiment, when one of two protection devices at two ends of the same high-voltage line is taken as a research, when the one receives a power loss state signal sent by a protection device at the opposite end, the one means that the protection device at the opposite end can enter and be in a power loss state.
In S203, it is determined whether the protection device is in a power-off state.
According to an embodiment, the protection device is in a power-off state, which means that the protection device fails and is powered off, whereas if the protection device is not in the power-off state, the protection device is in a normal working state.
According to an embodiment, the protection device has an energy storage unit, and can determine whether the protection device is in a power-off state according to the working condition of the energy storage unit and the input condition of an external power supply of the protection device.
According to an embodiment, the energy storage unit is a capacitor, and may be a farad capacitor or a super capacitor.
One of the functions of the energy storage unit is that when the protection device works normally, the energy storage unit is charged and further stores certain electric quantity; when the protection device loses power, namely the protection device is in a power-off state, the charged energy storage unit serves as a power supply, so that the protection device can utilize the electric quantity stored in the energy storage unit to send the fault information to the outside, namely, a power-off state signal is generated and sent to the protection device at the opposite end of the same section of high-voltage line. It is easy to think that if the energy storage unit is not arranged, the protection device can enter a power-off state silently, and the protection device can still be considered to be in normal operation when viewed from the outside, so that when the power transmission line has a fault, the corresponding protection device cannot be put into operation normally, and a plurality of problems and consequences are generated.
According to an embodiment, the capacitance capacity of the energy storage unit may be sized by the following relation:
wherein C is the capacitance of the energy storage unit, V0Is the initial operating voltage, V, of the energy storage unit1The voltage is the cut-off working voltage of the energy storage unit, I is the load current of the energy storage unit, and t is the continuous discharge time of the energy storage unit.
According to an embodiment, the power of the energy storage unit during discharging can be defined as positive, and the power of the energy storage unit during charging can be defined as negative.
According to an embodiment, the working condition of the energy storage unit may specifically be to determine whether the energy storage unit is in a discharging state. The method comprises the steps of firstly setting a power threshold fixed value of an energy storage unit, and judging that the energy storage unit is in a discharging state when the discharging power of the energy storage unit is larger than the power threshold fixed value. The power threshold fixed value of the energy storage unit can be obtained according to the following relation:
Pset＝kV1I。
wherein, PsetNamely, the power threshold of the energy storage unit is set; k is a reliability coefficient, and the value of k cannot be too large or too small, so that the discharge state of the energy storage unit is missed to be judged if the value is too large, and the discharge state of the energy storage unit is misjudged if the value is too small, and generally, the value is an empirical value, for example, the value can be properly 0.7.
According to one embodiment, the external power input condition of the protection device can be specifically divided into an external power with current input and an external power without current input.
According to an embodiment, if the energy storage unit is in a discharge state and an external power supply of the protection device does not have current input, the protection device is judged to be in a power-off state; otherwise, judging that the protection device is not in a power-off state.
In S205, if the protection device is not in the power-off state, the distance protection of the protection device is optimized based on the power-off state signal.
According to one embodiment, the power-off status signal is generated by a protection device that is powered off on the opposite side.
According to one embodiment, it should be noted that the determination "if the protection device is not in the power-off state" is only for substantially determining and ensuring that the protection device is in the normal operating state, and does not necessarily serve as a determination condition in the program logic.
One of the more common line protections is distance protection, which is divided into a distance protection I section, a distance protection II section, and a distance protection III section according to the distance and the position relationship between the position of the high-voltage line where a fault occurs and the protection device in the usual setting in the industry. The detailed related contents are well known to those skilled in the art and will not be described herein.
According to an embodiment, if the protection device is in a power-off state, a power-off state signal is generated and continuously sent to the protection device of the opposite terminal. That is to say, when the protection device detects that it is in a power-off state, it will send a power-off state signal to the protection device at the opposite end of the same high-voltage line to inform the protection device at the opposite end of the power-off state that the protection device is powered off, and will continue to send the power-off state signal until the power stored in the energy storage unit is exhausted. As shown in the determination flowchart of fig. 3, when it is determined that the energy storage unit is discharged and no current is input to the external power supply of the protection device, it may be determined that the protection device is in a power-off state, and a power-off state signal is sent to the protection device at the opposite end.
According to one embodiment, when the protection device which normally works receives the power-off state signal, the protection device waits for an energy storage discharge delay and then judges whether the pilot channel abnormal signal exists or not. And if the pilot channel abnormal signal exists, triggering a distance protection optimization signal to optimize the distance protection. Specifically, the action time of the distance protection can be shortened, the far backup distance protection can be added, or the two can be executed together. The energy storage discharge delay is the continuous discharge time of the energy storage unit, which is equivalent to the time for remaining electric quantity of the energy storage unit to maintain operation after the protection device at the opposite end loses power. Therefore, after waiting for an energy storage discharge delay, the power loss state signal continuously sent by the failed protection device, namely the power loss protection device, is stopped due to the power exhaustion of the energy storage unit. As shown in the judgment flowchart of fig. 4, the protection device waits for an energy storage discharge delay after receiving the power-off state signal, and triggers the distance protection optimization signal when the pilot channel abnormal signal exists.
Optionally, after the protection device that does not lose power determines that the continuously received power-off state signal disappears, it determines that a pilot channel abnormal signal exists, and then triggers a distance protection optimization signal.
The pilot channel is used for transmitting protection information in pilot protection of line protection, the existence of abnormal signals of the pilot channel means that the line loses main protection for protecting the full length of the line, the fault needs to be reliably removed as fast as possible by backup protection such as distance protection and the like during the fault, and the override misoperation needs to be avoided.
According to one embodiment, the distance protection includes a ground distance protection and an inter-phase distance protection. The distance protection action equation is as follows:
wherein, the working voltage during the earth fault is:
UOP＝UΦ-(IΦ+K×3I0)×ZZD；
the working voltage during phase-to-phase fault is:
UOP＝UΦΦ-IΦΦ×ZZD；
wherein, UPObtained by sampling the current positive-sequence voltage or the memory positive-sequence voltage before the fault for the polarization voltage, UΦTo protect the sampled phase voltages, IΦFor phase current, UΦΦAs the inter-phase voltage, IΦΦAs phase current, 3I0Is zero sequence current, K is zero sequence compensation coefficient, ZZDSetting a fixed value for distance protection.
According to an embodiment, shortening the action time of the distance protection includes shortening the action time t1 of the distance protection II segment and the action time t2 of the distance protection III segment.
According to one embodiment, the protection range of the far backup distance protection covers the high voltage line on which the protection device is located and the adjacent high voltage line or other electrical components, such as transformers, busbars, etc. The adjacent high-voltage line is the next section of high-voltage line from the protection device to the power-off protection device. That is, the protection range of the far backup distance protection includes the entire length of the adjacent line between the own line and the protection device, and the operation time thereof is set to t 3.
According to one embodiment, the distance impedance set by the far backup distance protection comprises the impedance of the present line and the protection lockout interval line to ensure sufficient sensitivity to end-of-line faults in the protection device power-down interval.
According to an embodiment, after the distance protection optimization, the following relationship exists among the action time t1 of the distance protection II segment, the action time t2 of the distance protection III segment, and the action time t3 of the far backup distance protection:
t1≤t2≤t3。
according to one embodiment, for example, during normal operation, the operating time t1 of the protection device is set to 0.8s from the protection stage II, and the operating time t2 of the protection device is set to 1.1s from the protection stage III. After the protection device sends out the distance protection optimization signal, t1 can be adjusted to be 0.5s to avoid the main protection action time, t2 is adjusted to be 0.8s, and the action time t3 of the increased far backup distance protection is set to be 1.5 s. Optionally, the same time level difference is maintained between the t1 and the t2 before and after adjustment.
According to some embodiments, at least one communication power supply and one protection power supply are arranged for the protection device; the protection power supply and the communication power supply are separated and independent in the transformer substation. Optionally, the communication power supply voltage is 48V, and the protection power supply voltage is 110V or 220V.
According to some embodiments, the action time of the newly added far backup distance protection of the protection device needs to be kept away from the oscillation lockout time, which is not less than 1.5 s.
Fig. 5 shows a block diagram of a distance protection device for a high voltage line protection device according to an embodiment of the present application.
As shown in fig. 5, the distance protection device for a high-voltage line protection device includes a power loss determining module 501, a signal sending module 503, and a distance protection optimizing module 505, wherein:
the power loss judging module 501 judges whether the protection device is in a power loss state.
And the signal sending module 503, if the protection device is in the power-off state, generates and continuously sends a power-off state signal to the protection device of the opposite terminal.
And a distance protection optimization module 505, which receives the power-off state signal and optimizes the distance protection if the protection device is not in the power-off state.
The distance protection device for the high-voltage line protection device performs similar functions to the method described above, and reference is made to the foregoing description, which is not repeated herein.
Fig. 6 shows a block diagram of a high voltage line protection system according to an embodiment of the present application.
As shown in fig. 6, the high-voltage line protection system includes: a first protection device 601 and a second protection device 603. Wherein:
the first protection device 601 and the second protection device 603 are protection devices at two ends of the same section of high-voltage line.
The first protection device 601 is configured such that when the first protection device 601 is in a power-down state, the first protection device 601 generates and continuously transmits a power-down state signal to the second protection device 603.
The second protection device 603 is configured to receive a power loss state signal and optimize distance protection of the second protection device 603 when the second protection device 603 is not in a power loss state.
According to an embodiment, the distance protection of the second protection device 603 is optimized, comprising:
the distance protection of the second protection device 603 is performed in a short time, and/or a long backup distance protection is added to the second protection device 603, wherein the protection range of the long backup distance protection covers the same section of high-voltage line and the adjacent high-voltage line or other electrical elements.
The high voltage line protection system performs similar functions to the above method, and reference is made to the above description, which is not repeated herein.
FIG. 7 shows a block diagram of an electronic device according to an example embodiment.
An electronic device 700 according to this embodiment of the present application is described below with reference to fig. 7. The electronic device 700 shown in fig. 7 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.
As shown in fig. 7, electronic device 700 is embodied in the form of a general purpose computing device. The components of the electronic device 700 may include, but are not limited to: at least one processing unit 710, at least one memory unit 720, a bus 730 that connects the various system components (including the memory unit 720 and the processing unit 710), a display unit 740, and the like.
Where the storage unit stores program code that may be executed by the processing unit 710 such that the processing unit 710 performs the methods described herein according to various exemplary embodiments of the present application. For example, the processing unit 710 may perform the methods described previously.
The storage unit 720 may include readable media in the form of volatile memory units, such as a random access memory unit (RAM)7201 and/or a cache memory unit 7202, and may further include a read only memory unit (ROM) 7203.
The storage unit 720 may also include a program/utility 7204 having a set (at least one) of program modules 7205, such program modules 7205 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
The electronic device 700 may also communicate with one or more external devices 7001 (e.g., keyboard, pointing device, bluetooth device, etc.), with one or more devices that enable a user to interact with the electronic device 700, and/or with any devices (e.g., router, modem, etc.) that enable the electronic device 700 to communicate with one or more other computing devices. Such communication may occur via an input/output (I/O) interface 750. Also, the electronic device 700 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network such as the internet) via the network adapter 760. The network adapter 760 may communicate with other modules of the electronic device 700 via the bus 730. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the electronic device 700, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. The technical solution according to the embodiments of the present application may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, or a network device, etc.) to execute the above method according to the embodiments of the present application.
The software product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
A computer readable storage medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable storage medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
The computer readable medium carries one or more programs which, when executed by a device, cause the computer readable medium to perform the functions described above.
Those skilled in the art will appreciate that the modules described above may be distributed in the apparatus according to the description of the embodiments, or may be modified accordingly in one or more apparatuses unique from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiment of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the embodiment of the present application.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the description of the embodiments is only intended to facilitate the understanding of the methods and their core concepts of the present application. Meanwhile, a person skilled in the art should, according to the idea of the present application, change or modify the embodiments and applications of the present application based on the scope of the present application. In view of the above, the description should not be taken as limiting the application.
Claims (12)
1. A distance protection method for a high voltage line protection device, the protection device comprising an energy storage unit, the method comprising:
receiving a power-off state signal sent by a protection device of an opposite terminal;
judging whether the protection device is in a power-off state or not;
and if the protection device is not in the power-off state, optimizing the distance protection of the protection device based on the power-off state signal.
2. The method of claim 1, wherein after determining whether the protection device is in a power-off state, further comprising:
and if the protection device is in a power-off state, generating and continuously sending the power-off state signal to the protection device at the opposite end.
3. The method of claim 1, wherein the determining whether the protection device is in a power-off state comprises:
and judging whether the protection device is in a power-off state or not based on the working condition of the energy storage unit and the external power supply input condition of the protection device.
4. The method of claim 1, wherein the energy storage unit comprises a capacitor or a battery.
5. The method of claim 4, wherein the capacitive capacity of the energy storage unit is determined as:
wherein C is the capacitance of the energy storage unit, V0Is the initial operating voltage, V, of the energy storage unit1The energy storage unit is a cut-off working voltage of the energy storage unit, I is a load current of the energy storage unit, and t is a continuous discharge time of the energy storage unit.
6. The method of claim 3, wherein the determining whether the protection device is in a power-off state based on the operating condition of the energy storage unit and an external power input condition of the protection device comprises:
judging whether the energy storage unit is in a discharging state:
setting a power threshold fixed value of the energy storage unit;
when the discharge power of the energy storage unit is larger than the power threshold fixed value, the energy storage unit is judged to be in a discharge state;
judging whether an external power supply of the protection device has current input;
if the energy storage unit is in a discharging state and an external power supply of the protection device does not have current input, judging that the protection device is in a power-off state, and otherwise, judging that the protection device is not in the power-off state.
7. The method of claim 1, wherein the optimizing distance protection of the protection device based on the power loss status signal comprises:
when the power failure state signal is received, waiting for an energy storage discharge delay, and judging whether a pilot channel abnormal signal exists or not;
if the pilot channel abnormal signal exists, triggering a distance protection optimization signal, shortening the action time of distance protection, and/or increasing far backup distance protection, wherein the protection range of the far backup distance protection covers the high-voltage line where the protection device is located, and an adjacent high-voltage line or other electrical elements.
8. The method of claim 7, wherein the reducing an action time of distance protection comprises:
the action time of the distance protection II section is shortened;
and the action time of the distance protection III section is shortened.
9. A distance protection device for a high voltage line protection device, the protection device comprising an energy storage unit, the device comprising:
the power failure judging module is used for judging whether the protection device is in a power failure state or not;
the signal sending module is used for generating and continuously sending a power-off state signal to the protection device at the opposite end if the protection device is in a power-off state;
and the distance protection optimization module is used for receiving the power-off state signal and optimizing the distance protection if the protection device is not in the power-off state.
10. A high-voltage line protection system, the protection system comprising a first protection device and a second protection device, the first protection device and the second protection device being protection devices at two ends of the same section of the high-voltage line, the method comprising:
the first protection device is configured to generate and continuously send a power-off state signal to the second protection device when the first protection device is in a power-off state;
the second protection device is configured to receive the power loss state signal and optimize distance protection of the second protection device when the second protection device is not in a power loss state.
11. The high-voltage line protection system of claim 10, wherein optimizing distance protection of said second protection device comprises:
the method comprises the following steps of shortening the action time of distance protection of the second protection device, and/or adding far backup distance protection for the second protection device, wherein the protection range of the far backup distance protection covers the same section of high-voltage line and adjacent high-voltage lines or other electric elements.
12. An electronic device, comprising:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method of any one of claims 1-8.
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