CN109633297B - Fault determination method and system under condition of key signal loss - Google Patents
Fault determination method and system under condition of key signal loss Download PDFInfo
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- CN109633297B CN109633297B CN201811333677.1A CN201811333677A CN109633297B CN 109633297 B CN109633297 B CN 109633297B CN 201811333677 A CN201811333677 A CN 201811333677A CN 109633297 B CN109633297 B CN 109633297B
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Abstract
The invention relates to a fault judgment method and a system under the condition of key signal loss, which are used for realizing the following steps: when one or more equipment front-end signals in the power distribution system are detected, carrying out outlet switch tripping analysis on the equipment front-end signals, and judging whether to trip or not; if the outgoing line switch is judged to be tripped, further analyzing the outgoing line switch protection signal, and judging whether the outgoing line switch protection signal is in fault tripping; and after judging the type of the trip, sending a remote signaling message to the background substation, and updating the topological state of the front end of the equipment in the power distribution system. The invention has the beneficial effects that: the line fault under the station can be accurately judged under the condition that the EMS transmits the missed transmission or the delay exceeds a specified range; the method can accurately judge the line fault under the substation under the condition that the substation signal is not transmitted and is not directly extracted.
Description
Technical Field
The invention relates to a fault judgment method and a fault judgment system under the condition of key signal loss, and belongs to the field of computers and electric power.
Background
During the operation of distribution automation master station system, under most circumstances, the three remote information of transformer substation all need to forward to distribution automation master station system through the EMS system, because EMS forwardding reasons such as mechanism, cause the inevitable problem of losing of signal that has of transformer substation information that distribution master station system received, perhaps send the distribution master station system to on the signal and have great delay, and these 2 reasons all can lead to the feeder fault handling of distribution master station system not to start.
The existing distribution automation main station system feeder fault starting judgment conditions mainly comprise two conditions. Firstly, a power failure area must be generated when the switch trips; secondly, the protection signal and the trip signal received by the system must satisfy a certain time difference. As long as both conditions are met, the system will initiate a feeder fault handling procedure.
As shown in fig. 1, in the case of tripping the blackout area, the same outlet switch trip signal received at any time between T1 and T2 satisfies the feeder fault start condition, where Δ T01、ΔT02It is possible to set T0 in fig. 1 as the time of the protection operation.
As in the solution of fig. 1, there are the following disadvantages: namely, under the condition that the substation signal is forwarded by means of the EMS, the starting of the fault processing completely depends on the reliability and the real-time property of message forwarding, and when the EMS forwarding has the condition of missing forwarding or large delay and a fault occurs on the distribution network system, the master station system cannot correctly identify and start the fault processing program.
Disclosure of Invention
Summary several example aspects of the disclosure are as follows. This summary is provided for the convenience of the reader to provide a basic understanding of the embodiments and is not intended to be a full definition of the scope of the invention. This summary is not an extensive overview of all contemplated embodiments, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more embodiments in a simplified form as a prelude to the more detailed description that is presented later. For convenience, the term "some embodiments" may be used herein to refer to a single embodiment or to multiple embodiments of the disclosure.
Aiming at the problems, the invention provides a fault judgment method and a fault judgment system under the condition of key signal loss, and overcomes the defects of the prior art. The technical scheme mainly comprises two functions. Deducing whether the outgoing switch has trip time, when the on-site outgoing switch trips, normally, part of specific terminals in the power failure range have signals which change along with the on-site outgoing switch, and keeping the signals until the outgoing switch is closed again and then reset, so that the current state of the outgoing switch can be reversely deduced according to the action signals on the line; and deducing whether the outgoing line switch has a protection action event or not, if the field outgoing line switch tripping is caused by line faults, an overcurrent fault signal exists on the switch of a power supply path of a fault point, and if the fault point is in a head end area behind the outgoing line switch, reversely deducing whether the outgoing line switch has the protection signal or not according to the characteristic.
The technical scheme of the invention comprises a fault judgment method under the condition of key signal loss, which is characterized by comprising the following steps: s1, when one or more equipment front end signals in the power distribution system are detected, carrying out outlet switch tripping analysis on the equipment front end signals, and judging whether tripping occurs or not; s2, if the step S1 judges that the line switch trips, further analyzing the protection signal of the line switch, and judging whether the line switch trips due to a fault; and S3, sending a remote signaling message to the background substation after judging the type of the trip, and updating the topological state of the front end of the equipment in the power distribution system.
According to the fault judgment method under the condition of the absence of the key signals, the method further comprises the following steps: and manually releasing the deduction and distribution of the tripping of the outgoing line switch, wherein the state of the outgoing line switch after releasing the deduction and distribution is the state of finally transmitting the remote signaling message to the power distribution system.
According to the fault judgment method under the condition of the absence of the key signals, the method further comprises the following steps: when the state updating processing process receives the state change signals of the front ends of one or more devices, judging whether the state of the standard power outlet switch is closed or not, and applying for the state of the outlet switch to infer an analysis timer if a test and a holding board are not hung; when the state updating process receives the outgoing switch fractal signal, the outgoing switch state inference analysis timer is cancelled; and starting the outgoing switch state inference analysis processing when the outgoing switch state inference analysis timer is overtime, ending the process if the outgoing switch state inference analysis timer is switched on or switched off, calling the remote signaling of the transformer substation if the outgoing switch state inference analysis timer is switched off or switched on, updating the topology according to the branch state, recording the inference event, and notifying the fault judgment processing.
According to the method for determining a fault in the absence of the key signal, the step S1 specifically includes: s11, judging whether the actual state of the outgoing switch is "on", wherein the judgment premise is that the current state of the outgoing switch is "off"; s12, screening outgoing line switch signals, and taking signals of one or more front ends of equipment in the power failure range of the outgoing line switch as analysis signals, wherein the front ends of the equipment comprise but are not limited to a watchdog, a load switch, a switch and a box transformer substation; and S13, setting the electrified power loss coefficient of one or more outgoing line switches at the front end of the equipment, and calculating and judging the switch to be in a power loss state or an electrified state according to the actually acquired signals.
According to the method for determining a fault in the absence of the key signal, the step S13 specifically includes:
use of
X1+X2+...+XnFor signal 1 to signal n reliable coefficient X1To XnIn which X isa+Xb+...+XkIs the signal sum of signal 1 to signal n; wherein, IAThe larger the value, the greater the likelihood of this switch losing power; i isAThe smaller the value is, the more likely the switch is charged, and the smaller the value is, and the smaller the value is 0; when I isAWhen the voltage is 0, it cannot be determined whether the switch is charged or discharged.
According to the fault judgment method under the condition of the absence of the key signals, the method further comprises the following steps: s14, setting the switch to be in communication abnormal state IA0, I of manual switchA0; and S15, setting the coefficient of the switch to be equal to the sum of the electrified and power-off coefficients of all switches on the load side, and calculating the sum of the coefficients of the outgoing switch, the manual switch and the abnormal communication switch. And S16, when the coefficient sum of the outgoing line switch is larger than or equal to the coefficient sum of other switches on the line and the coefficient sum is larger than or equal to 1, judging that the outgoing line switch is in the off state.
According to the method for determining a fault in the absence of the key signal, the step S2 specifically includes: s21, when the outgoing switch trips, a timer of a re-detection protection state is generated, and when the timer times out, whether a protection signal of the outgoing switch or a total accident signal of a transformer substation is received or not is judged, and then the inference analysis of the protection signal is started; and S22, when the protection signal and/or the accident total signal are received, the fault signal judgment and the fault signal generation time are analyzed based on the judgment rule.
According to the method for determining a fault in the absence of the key signal, the step S22 specifically includes: when two or more switches are found in a path from the FCB to any end section at the same time and meet a first condition and a second condition, judging that an accident always occurs; when the path from the FCB to any terminal interval finds at most one automatic switch meeting the first condition and the second condition, judging that an accident occurs when the number of the automatic switches passing from the FCB to the switch is less than or equal to 1; the first condition is that all automatic switch signals in the FCB power-off range exist, the second condition is that the fault signal with the fault action time less than 1 minute from the current time analyzes the collected automatic switch signals, and the automatic switch signals are used for deducing whether an accident occurs or not.
The technical solution of the present invention further includes a fault determination system for performing any of the above methods in the absence of a critical signal, wherein the system includes: the tripping judging module is used for carrying out outlet switch tripping analysis on the equipment front-end signals and judging whether to trip or not when one or more equipment front-end signals in the power distribution system are detected; a protection signal determination module, which further analyzes the protection signal of the outgoing line switch to determine whether the protection signal is a fault trip or not after the step S1 determines that the outgoing line switch trips; and the remote signaling module is used for sending a remote signaling message to the background substation after judging the type of the trip, and updating the topological state of the front end of the equipment in the power distribution system.
The invention has the beneficial effects that: the line fault under the station can be accurately judged under the condition that the EMS transmits the missed transmission or the delay exceeds a specified range; the method can accurately judge the line fault under the substation under the condition that the substation signal is not transmitted and is not directly extracted.
Drawings
FIG. 1 is a schematic view of the prior art;
FIG. 2 is a general flow diagram of the present invention;
FIG. 3 is a block diagram illustrating a system architecture according to an embodiment of the present invention;
FIG. 4 is a flow chart according to an embodiment of the present invention;
FIG. 5 is a circuit diagram for switch trip determination according to an embodiment of the present invention;
FIG. 6 is a circuit diagram for switch fault determination according to an embodiment of the present invention;
FIG. 7 is a switch trip inference flow diagram according to an embodiment of the invention;
fig. 8 is a flow chart illustrating a guard signal inference analysis according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention comprises a data verification method and a data verification system based on a templated database view, which are suitable for the following clear and complete description of the concept, the specific structure and the generated technical effect of the invention by combining the embodiment and the attached drawings so as to fully understand the purpose, the scheme and the effect of the invention.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the descriptions of upper, lower, left, right, etc. used in the present disclosure are only relative to the mutual positional relationship of the constituent parts of the present disclosure in the drawings. As used in this disclosure, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, 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. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element of the same type from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. The use of any and all examples, or exemplary language ("e.g.," such as "or the like") provided herein, is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed.
Fig. 2 shows an overall flow chart of the present invention. It includes: s1, when one or more equipment front end signals in the power distribution system are detected, carrying out outlet switch tripping analysis on the equipment front end signals, and judging whether tripping occurs or not; s2, if the step S1 judges that the line switch trips, further analyzing the protection signal of the line switch, and judging whether the line switch trips due to a fault; and S3, sending a remote signaling message to the background substation after judging the type of the trip, and updating the topological state of the front end of the equipment in the power distribution system.
Fig. 3 is a block diagram illustrating a system architecture according to an embodiment of the present invention. The method specifically comprises the following steps: the tripping judging module is used for carrying out outlet switch tripping analysis on the equipment front-end signals and judging whether to trip or not when one or more equipment front-end signals in the power distribution system are detected; a protection signal determination module, which further analyzes the protection signal of the outgoing line switch to determine whether the protection signal is a fault trip or not after the step S1 determines that the outgoing line switch trips; and the remote signaling module is used for sending a remote signaling message to the background substation after judging the type of the trip, and updating the topological state of the front end of the equipment in the power distribution system.
Fig. 4 shows a flow diagram according to an embodiment of the invention. Two modules, namely 'outlet switch tripping inference analysis' and 'protection state inference analysis' are added in the original fault judgment process. When the online state updating processing program receives a signal representing that the voltage of the power supply side of the equipment is low, the online state updating processing program informs the outlet switch tripping inference analysis module, and the module synthesizes a state remote signaling analysis outlet switch on the distribution line and informs the fault judgment module when a tripping event occurs. When the fault judging module checks whether a protection signal occurs at present, if the protection action signal is not received at present, the fault judging module switches to a protection state inference analysis module, the module infers whether a protection action occurs on a line switch or not by integrating fault signals on a line, and if the protection action occurs, the fault judging module starts fault processing.
Fig. 5 is a circuit diagram for determining switch trip according to an embodiment of the present invention, for inferring trip of an outgoing switch, wherein: F1-F3 are normally closed load switches, K1-K5 are watchdog, L1-L2 are normally open load switches, and S1 is a manual switch. When the outgoing switch is tripped, a part of specific terminals within the power failure range of the outgoing switch normally have signals which are changed along with the outgoing switch, and the signals are kept until the outgoing switch is reset after being closed again, so that the current state of the outgoing switch can be reversely deduced according to the action signals on the line. Table 1 shows a list of operation signals generated when the front end of the device loses power
The following table is a list of action signals generated when the front end of the equipment loses power
TABLE 1
The method for deducing the trip of the outgoing line switch based on the table 1 and the drawing specifically comprises the following steps:
(1) the current state of the outgoing line switch is closed, and whether the actual state of the outgoing line switch is in a branch state needs to be inferred.
(2) Using the signals of watchdog, load switch, shutter and box transformer in the power failure range of outlet switch
(3) Defining the "live power loss coefficient" of the switch to represent whether the automatic switch is in a live state or a power loss state, assuming that n signals of the switch A act with power loss, defining the reliable coefficients X1 to Xn from signal 1 to signal n, and defining the "live power loss coefficient" as follows:
it can be seen from the formula that when the switch can reliably transmit the signal to the background, IAThe larger the value is, the more the switch is likely to lose power, and the smaller the value is (less than 0), the more the switch is likely to be charged, when I isAWhen 0, it cannot be determined whether the switch is charged or discharged.
Taking a load switch as an example, defining the reliability coefficient of no-voltage release as 2, the reliability coefficient of no-voltage alarm at a power supply side as 1, and the reliability coefficient of no-voltage alarm at a load side as 1, wherein if the current of the switch is the no-voltage release action, the no-voltage action at the power supply side and the no-voltage reset at the load side, the 'live power loss coefficient' of the switch is
IA＝(2+1+1)*((2+1)/(2+1+1)-0.5)＝1
For the watchdog, only the power supply side no-voltage alarm can be used to calculate the "live power loss coefficient", and the reliability coefficient of the power supply side no-voltage alarm is defined as 1, so it is obvious that when the power supply side no-voltage alarm acts (IA ═ 0.5), when the power supply side no-voltage alarm returns (IA ═ 0.5).
(4) When the predetermined switch is in communication abnormality, IA is 0, and IA of the manual switch is 0.
(5) The 'coefficient total' of the defined switch is equal to the sum of 'live power loss coefficients' of all switches on the load side, and only the outgoing line switch, the manual switch (the load switch is not a knife switch) and the switch with abnormal communication need to calculate the 'coefficient total'.
(6) And when the coefficient total of the outgoing line switch is greater than or equal to the coefficient total of other switches on the line and the coefficient total is greater than or equal to 1, the outgoing line switch is judged to be a branch.
The technical scheme of the invention also provides the following examples:
example 1: when the actual condition FCB is divided and the signals on the line are normal, the distribution line state is in the state of the following table 2
TABLE 2
Calculate the "coefficient sum" of each switch "
FCB:IF1+IF2+IF3+IK1+IK2+IK3+IK4+IK5＝8.5
S1:IK4+IK5＝1
Can deduce the FCB score
Example 2: when the actual conditions FCB are closed, S1 is divided, and the signals on the line are normal, the distribution line state is in the state of the table 3 below
TABLE 3
Calculate the "coefficient sum" of each switch "
FCB:IF1+IF2+IF3+IK1+IK2+IK3+IK4+IK5＝-6.5
S1:IK4+IK5＝1
Can deduce the FCB sum
Example 3: when the actual conditions FCB are closed, F2 has no response and is divided, and the signals on the line are normal, the distribution line state is in the state of table 4 below
TABLE 4
Calculate the "coefficient sum" of each switch "
FCB:IF1+IF2+IF3+IK1+IK2+IK3+IK4+IK5＝0.5
S1:IK4+IK5＝1
F2：IF3+IK3+IK4+IK5＝3.5
Can deduce the FCB sum
Example 4: when the actual condition FCB is divided into F2 no-response, F1 does not send signal, but the communication is still normal on DAS and other signals on the line are normal, the distribution line state is in the state of the following table 5
TABLE 5
Calculate the "coefficient sum" of each switch "
FCB:IF1+IF2+IF3+IK1+IK2+IK3+IK4+IK5＝2.5
S1:IK4+IK5＝1
F2：IF3+IK3+IK4+IK5＝3.5
Can deduce the FCB sum
The result of this inference appears to be inconsistent with reality, in fact the "total coefficient" difference between FCB and F2 is equal to IF1+IK1+IK2，IF1+IK1+IK2The positive or negative of (2) determines the result of the determination, and we can also consider that the FCB combination is determined to be correct and both K1 and K2 send wrong power-side no-voltage operation signals at this time, so we need to determine that all three signals of F1 are not sent or both K1 and K2 send wrong signals, and in this case, the definition of the reliability coefficient of each signal is important, and if the reliability coefficient of the no-voltage release of the load switch is set to 1, the reliability coefficient of the no-voltage alarm of the power side is 0.5, the reliability coefficient of the no-voltage alarm of the load side is 0.5, and the reliability coefficient of the no-voltage alarm of the watchdog power-side is set to 1, the value of the "with power loss coefficient" of each switch is as follows
TABLE 6
Calculate the "coefficient sum" of each switch "
FCB:IF1+IF2+IF3+IK1+IK2+IK3+IK4+IK5＝2.5
S1:IK4+IK5＝1
F2：IF3+IK3+IK4+IK5＝2.5
From a practical point of view, i believe that both switches are in error and that one switch is not. Therefore, the reliability coefficient of the non-voltage release of the combination switch is set to be 1, the reliability coefficient of the non-voltage alarm at the power supply side is set to be 0.5, the reliability coefficient of the non-voltage alarm at the load side is set to be 0.5, and the reliability coefficient of the non-voltage alarm at the power supply side of the watchdog is set to be 1, so that the non-voltage alarm is more reliable.
Fig. 5 is a circuit diagram for determining a switch failure according to an embodiment of the present invention. As shown in the figure: F1-F9 are normally closed load switches, and L1-L2 are normally open load switches. The rules for the outlet switch protection signal inference are as follows: when the outgoing switch trips, the system applies for a timer (time delta T can be set) for rechecking the protection state, and when the timer times out, the system judges that the protection signal of the outgoing switch or the accident total signal of the transformer substation is not received at present and starts the inference analysis of the protection signal. Method for the inferred analysis of protection signals when an accident occurs on a line, all switches in the path from the point of the accident to the outgoing switch will pass through the fault current, and all the automatic switches in the path should generate the fault signals. In principle, therefore, the total signal of the substation accident can be deduced as long as there is a switch on the line that generates a fault signal. However, we should consider the case of missending signals (including jitter signals) by the switch to avoid erroneously inferring the total signal of the fault to start the fault handling procedure. Therefore, in addition to determining whether a signal is generated, it is necessary to determine the time when the signal is generated, and the closer the generation time is to the current time can represent that the fault signal is caused by tripping in the current accident (the temporary time difference is less than 1 minute, the signal is reliable). The decision principle is now generalized as follows: 1) all automatic switches (with normal communication) in the power failure range of the FCB participate in inference analysis; 2) the fault signal with the fault action time less than 1 minute from the current time is used for deducing the total accident signal; 3) when two or more switches meeting the conditions 1 and 2 are found in the path from the FCB to any tail end interval, judging that the accident always occurs; 4) when at most one switch meeting the conditions 1 and 2 is found on the path from the FCB to any end interval, the accident is judged to always happen if the number of the automatic switches passing through the FCB to the switch is less than or equal to 1.
Taking fig. 6 as an example, the technical solution of the present invention proposes the following examples:
now assume that the decision event is less than 1 minute for all fault signaling events
Example 1: when only F4 has a fault signal
Deducing no action of outlet switch protection signal (principle 4)
Example 2: when F4 and F9 have fault signals simultaneously
Deducing that the line switch protection signal is not active (principle 4, since F4, F9 are not on the same supply path)
Example 3: when F5 and F9 have fault signals simultaneously
Push-out line switch protection signal action (principle 3)
Example 4: when F3 has a fault signal
Deducing the protection signal action of the outgoing line switch (principle 4)
Example 5: when F4 has fault signal and F3 has no response
Deducing the protection signal action of the outgoing line switch (principles 1 and 4)
Fig. 7 is a flow diagram of switch trip inference according to an embodiment of the invention. The specific flow is as follows:
when the state updating process receives the state change signal of the table 1, the state of the standard power outlet switch is judged to be closed, and if no test or holding plate is hung, the state inference analysis timer of the outlet switch is applied.
And when the state updating processing process receives the outgoing switch branching change signal, canceling the outgoing switch state inference analysis timer.
And starting the outgoing switch state inference analysis processing when the outgoing switch state inference analysis timer is overtime, ending the process if the outgoing switch state inference analysis timer is switched on or switched off, calling the remote signaling of the transformer substation if the outgoing switch state inference analysis timer is switched off, updating the topology according to the branch state, outputting an event record of 'inference branch' and informing the fault judgment processing.
After receiving the calling response message of the EMS, the front-end sends a transformer substation full remote signaling message (command words are distinguished from periodic messages) to the background, and at the moment, the shape change message is not required even if individual remote signaling changes.
When the state updating process receives the on-off change message of the outgoing switch, the deduction and the card distribution are removed, and the topology is updated
The inferred split cards can be manually removed, and the state of the outgoing switch after the inferred split cards are removed is the state that the remote signaling message is finally sent to the system.
Fig. 8 is a flow chart illustrating a guard signal inference analysis according to an embodiment of the present invention. The general flow is as follows:
and judging whether a protection signal exists or not when the outgoing switch protection rechecking timer is overtime, and starting the outgoing switch protection signal inference analysis processing if the protection signal does not exist.
When the protection signal recheck result informs the fault processing process, if the protection signal is inferred to occur, the fault processing process is informed that the protection signal is inferred.
When the fault processing process receives the protection rechecking result, whether the protection signal is the inferred result or not is judged, and if the protection signal is the inferred result, the self-healing processing cannot be started later.
It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, according to the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, the operations of processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the methods may be implemented in any type of computing platform operatively connected to a suitable connection, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention herein includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the above steps in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques of the present invention.
A computer program can be applied to input data to perform the functions herein to transform the input data to generate output data that is stored to non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including particular visual depictions of physical and tangible objects produced on a display.
The present invention is not limited to the above embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the scope of the present invention as long as the technical effects of the present invention are achieved by the same means. The invention is capable of other modifications and variations in its technical solution and/or its implementation, within the scope of protection of the invention.
Claims (7)
1. A method for determining a fault in the absence of a critical signal, the method comprising the steps of:
s1, when one or more equipment front end signals in the power distribution system are detected, carrying out outlet switch tripping analysis on the equipment front end signals, and judging whether tripping occurs or not;
s2, if the step S1 judges that the line switch trips, further analyzing the protection signal of the line switch, and judging whether the line switch trips due to a fault;
s3, sending a remote signaling message to the background substation after judging the type of the trip, and updating the topological state of the front end of the equipment in the power distribution system;
the step S1 specifically includes:
s11, judging whether the actual state of the outgoing switch is "on", wherein the judgment premise is that the current state of the outgoing switch is "off";
s12, screening outgoing line switch signals, and taking signals of one or more front ends of equipment in the power failure range of the outgoing line switch as analysis signals, wherein the front ends of the equipment comprise but are not limited to a watchdog, a load switch, a switch and a box transformer substation;
s13, setting the electrified power loss coefficient of one or more outgoing line switches at the front end of the equipment, and calculating and judging the switch to be in a power loss state or an electrified state according to the actually acquired signals;
the step S2 specifically includes:
s21, when the outgoing switch trips, a timer of a re-checking protection state is generated, and when the timer times out, the fact that the protection signal of the outgoing switch or the accident total signal of the transformer substation is received at present is judged, and then the inference analysis of the protection signal is started;
and S22, when the protection signal and/or the accident total signal are received, the fault signal judgment and the fault signal generation time are analyzed based on the judgment rule.
2. The method of claim 1, further comprising: and manually removing the outgoing switch tripping deduction and card distribution, wherein the outgoing switch state after the deduction and card distribution is removed is the state that the remote signaling message is finally sent to the power distribution system, and the deduction and card distribution is a mark on the FCB deduction and card distribution processing post-position.
3. The method of claim 1, further comprising:
when the state updating processing process receives the state change signals of the front ends of one or more devices, the state of the standard power supply outlet switch is judged to be closed, and if no test board or holding board is hung, the outlet switch state inference analysis timer is applied, wherein the test board or the holding board is not hung and indicates that the outlet switch is not in the test and holding state;
when the state updating process receives the outgoing switch fractal signal, the outgoing switch state inference analysis timer is cancelled;
and starting the outgoing switch state inference analysis processing when the outgoing switch state inference analysis timer is overtime, ending the process if the outgoing switch state inference analysis timer is switched on or switched off, calling the remote signaling of the transformer substation if the outgoing switch state inference analysis timer is switched off or switched on, updating the topology according to the branch state, recording the inference event, and notifying the fault judgment processing.
4. The method according to claim 1, wherein the step S13 specifically includes:
use of
Judging the outgoing line switch, wherein IARepresenting the live loss factor, wherein X1+X2+...+XnFor signal 1 to signal n reliable coefficient X1To XnIn which X isa+Xb+...+XkIs the signal sum of signal 1 to signal k;
wherein the content of the first and second substances,
IAthe larger the value, the greater the likelihood of this switch losing power;
IAthe smaller the value is, the more likely the switch is charged, and the smaller the value is, and the smaller the value is 0;
when I isAWhen the voltage is 0, it cannot be determined whether the switch is charged or discharged.
5. A method of fault determination in the absence of a critical signal according to claim 3 or claim 1, further comprising:
s14, setting the switch to be in communication abnormal state IA0, I of manual switchA＝0；
S15, setting the coefficient of the switch to be equal to the sum of the electrified and power-off coefficients of all switches on the load side, and calculating the sum of the coefficients of the outgoing switch, the manual switch and the abnormal communication switch;
and S16, when the coefficient sum of the outgoing line switch is larger than or equal to the coefficient sum of other switches on the line and the coefficient sum is larger than or equal to 1, judging that the outgoing line switch is in the off state.
6. The method according to claim 1, wherein the step S22 specifically includes:
when two or more switches are found in a path from the FCB to any end section at the same time and meet a first condition and a second condition, judging that an accident always occurs;
when the route from the FCB to any terminal interval is provided with at most one automatic switch meeting the first condition and the second condition, judging that an accident occurs when the time from the FCB to the automatic switch is less than or equal to 1 hour;
the first condition is that all automatic switch signals in the FCB power-off range exist, the second condition is that the fault signal with the fault action time less than 1 minute from the current time analyzes the collected automatic switch signals, and the automatic switch signals are used for deducing whether an accident occurs or not.
7. A fault determination system in the absence of critical signals for performing the method of any one of claims 1 to 6, the system comprising:
the tripping judging module is used for carrying out outlet switch tripping analysis on the equipment front-end signals and judging whether to trip or not when one or more equipment front-end signals in the power distribution system are detected;
a protection signal determination module, which further analyzes the protection signal of the outgoing line switch to determine whether the protection signal is a fault trip or not after the step S1 determines that the outgoing line switch trips;
the remote signaling module is used for sending a remote signaling message to the background substation after judging the type of the trip, and updating the topological state of the front end of the equipment in the power distribution system;
the trip decision module is configured to perform the steps of:
s11, judging whether the actual state of the outgoing switch is "on", wherein the judgment premise is that the current state of the outgoing switch is "off";
s12, screening outgoing line switch signals, and taking signals of one or more front ends of equipment in the power failure range of the outgoing line switch as analysis signals, wherein the front ends of the equipment comprise but are not limited to a watchdog, a load switch, a switch and a box transformer substation;
s13, setting the electrified power loss coefficient of one or more outgoing line switches at the front end of the equipment, and calculating and judging the switch to be in a power loss state or an electrified state according to the actually acquired signals;
the protection signal decision module is used for executing the following steps:
s21, when the outgoing switch trips, a timer of a re-checking protection state is generated, and when the timer times out, the fact that the protection signal of the outgoing switch or the accident total signal of the transformer substation is received at present is judged, and then the inference analysis of the protection signal is started;
and S22, when the protection signal and/or the accident total signal are received, the fault signal judgment and the fault signal generation time are analyzed based on the judgment rule.
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