CN115207888A - Rapid export method and device of relay protection device, terminal and storage medium - Google Patents
Rapid export method and device of relay protection device, terminal and storage medium Download PDFInfo
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- CN115207888A CN115207888A CN202211118347.7A CN202211118347A CN115207888A CN 115207888 A CN115207888 A CN 115207888A CN 202211118347 A CN202211118347 A CN 202211118347A CN 115207888 A CN115207888 A CN 115207888A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
The invention provides a rapid export method, a rapid export device, a rapid export terminal and a rapid export storage medium for a relay protection device. The method comprises the following steps: collecting a cycle wave fault data of a power line protected by a relay protection device, wherein the cycle wave fault data comprises fault current; calculating current amplitude for a cycle of fault data; after the calculation starting time of the current amplitude and before the calculation finishing time, controlling the relay protection device to start outputting an outlet signal for controlling the relay to be disconnected; judging whether the current amplitude is larger than a current threshold value; if the current amplitude is larger than the current threshold value, the outlet signal is continuously output so that the relay is disconnected. The invention can ensure the accuracy of the action of the relay protection device and shorten the action time of the relay protection device.
Description
Technical Field
The invention relates to the technical field of power system transmission and distribution automation, in particular to a quick export method, a quick export device, a quick export terminal and a quick export storage medium for a relay protection device.
Background
The relay protection is an important component of a power system, is an important technical means for ensuring safe operation of a power grid, has high accident speed of the power system, is wide in related area, and can cause great influence on national economy and people's life. In spite of major power accidents at home and abroad, a single fault occurs in a certain local link of a power grid without any exception, and the fault cannot be quickly and accurately isolated.
The quick action of the protection device can rapidly remove the fault, prevent the accident from expanding, prevent the equipment from being damaged more seriously, reduce the working time of a fault-free user under the conditions of low voltage and power failure, and accelerate the process of recovering the normal operation.
In the prior art of protecting the rapid action of a device, most enterprises generally use low CPU master frequency in order to save cost, so that the allowance of the action time of an outlet of the device is small, and in addition, some products such as FTUs have complex running algorithms of the CPU and serious insufficient allowance of the action time of the outlet; still other businesses are aware of the lack of export action time margins and make improvements: a surplus time is reserved for the action time of the outlet of the protection device by reducing the collection fault point, but the accuracy of the action of the protection device is greatly reduced by the improved scheme. Therefore, the improvement of the accuracy and the quick action of the protection device is of great significance.
Disclosure of Invention
The invention provides a rapid export method, a rapid export device, a rapid export terminal and a rapid export storage medium of a relay protection device, and aims to solve the problem that the relay protection device is long in action time.
In a first aspect, the present invention provides a method for fast exporting a relay protection device, including:
collecting cycle fault data of a power line protected by a relay protection device, wherein the cycle fault data comprises fault current;
calculating the current amplitude of the one-cycle fault data;
after the calculation starting time and before the calculation finishing time of the current amplitude, controlling the relay protection device to start outputting an outlet signal for controlling the relay to be disconnected;
judging whether the current amplitude is larger than a current threshold value;
and if the current amplitude is larger than the current threshold value, continuously outputting the outlet signal to disconnect the relay.
In a possible implementation manner, before the collecting cycle fault data of the power line protected by the relay protection device, the method further includes:
acquiring ADC data of the power line in real time through an ADC chip;
extracting a mutation amount in the ADC data;
judging whether N continuous mutation quantities in the ADC data are all larger than a mutation fixed value;
and if N continuous mutation amounts are larger than the mutation fixed value in the ADC data, executing a cycle of fault data collecting step of the power line protected by the relay protection device.
In one possible implementation, the ADC data includes a current; the amount of the abrupt change comprises an abrupt change current; the extracting of the amount of mutation in the ADC data comprises:
if the current at the current moment meets a first formula, determining the current at the current moment as the abrupt current;
the first formula is:
wherein the content of the first and second substances,
is Zhou BodikThe sudden change in current at the moment in time,
is the first cyclekThe sudden change in current at the moment in time,
is the first two cycleskAbrupt current at the moment.
In a possible implementation manner, the collecting cycle fault data of the power line protected by the relay protection device includes:
and collecting cycle fault data of the power line protected by the relay protection device from a first sudden change of the continuous N sudden change values larger than the sudden change fixed value.
In one possible implementation, the calculating the current amplitude for the one-cycle fault data includes:
and calculating the current amplitude of the one-cycle fault data by adopting a fast Fourier transform algorithm.
In one possible implementation, if the current amplitude is greater than the current threshold, the outlet signal continues to be output to open the relay, and the method further includes:
and if the current amplitude is not greater than the current threshold, controlling the relay protection device to stop outputting the outlet signal.
In a second aspect, the present invention provides a rapid exit device for a relay protection device, including: the device comprises an acquisition module, a calculation module, a first output module, a judgment module and a second output module;
the acquisition module is used for acquiring cycle fault data of a power line protected by a relay protection device, wherein the cycle fault data comprises fault current;
the calculation module is used for calculating the current amplitude of the cycle fault data;
the first output module is used for controlling the relay protection device to start outputting an outlet signal for controlling the relay to be disconnected after the calculation starting time and before the calculation finishing time of the current amplitude;
the judging module is used for judging whether the current amplitude is larger than a current threshold value;
and the second output module is used for continuously outputting the outlet signal if the current amplitude is greater than the current threshold value so as to disconnect the relay.
In a possible implementation manner, the apparatus further includes a failure determination module, where the failure determination module is configured to:
acquiring ADC data of the power line in real time through an ADC chip;
extracting a mutation quantity in the ADC data;
judging whether N continuous mutation quantities in the ADC data are all larger than a mutation fixed value;
and if the N continuous mutation amounts in the ADC data are all larger than the mutation fixed value, executing the acquisition module.
In a third aspect, the present invention provides a terminal, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method according to the first aspect or any one of the possible implementation manners of the first aspect.
In a fourth aspect, the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, performs the steps of the method according to the first aspect or any one of the possible implementations of the first aspect.
The invention provides a rapid exit method, a device, a terminal and a storage medium of a relay protection device, which can ensure the action accuracy of the relay protection device by acquiring a cycle wave fault data of a power line of the relay protection device and then calculating the cycle wave fault data, and simultaneously, after the calculation starting moment and the calculation finishing moment of a current amplitude, the relay protection device is controlled to start outputting an exit signal for controlling the relay to be disconnected, so that the relay protection device outputs the exit signal in advance, the action time of the relay protection device is shortened, and finally whether the current amplitude is greater than a current threshold value or not is judged, and if the current amplitude is greater than the current threshold value, the exit signal is continuously output to disconnect the relay. The invention can not only calculate the current amplitude by collecting the fault data of one cycle to ensure the accuracy of the action of the relay protection device, but also control the relay protection device to start outputting the outlet signal for controlling the action of the relay while calculating the current amplitude, and the relay protection device outputs the outlet signal in advance, thereby shortening the action time of the relay protection device.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a fault current waveform diagram of a rapid exit method for a relay protection device according to an embodiment of the present invention;
fig. 2 is a flowchart of an implementation of a fast exit method of a relay protection device according to an embodiment of the present invention;
fig. 3 is a characteristic diagram of a fast export method of a relay protection device according to an embodiment of the present invention;
fig. 4 is an action flow chart of a rapid exit method of a relay protection device according to an embodiment of the present invention;
fig. 5 is an action flow chart of a rapid exit method of a relay protection device according to an embodiment of the present invention;
fig. 6 is an action flow chart of a rapid exit method of a relay protection device according to an embodiment of the present invention;
fig. 7 is a timing diagram of actions of a fast egress method of a relay protection device according to an embodiment of the present invention;
fig. 8 is a block diagram of an implementation flow of a fast exporting method of a relay protection device according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a quick exit device of a relay protection device according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
To make the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
Fig. 1 is a waveform diagram of a fault current of a rapid exit method of a relay protection device according to an embodiment of the present invention.
The relay protection device generally refers to an automatic measure and equipment which can send a warning signal to an operator on duty in time or directly send a trip command to a controlled circuit breaker to terminate the development of events when a fault occurs in a power element (such as a generator, a line, etc.) in a power system or the power system itself endangers the safe operation of the power system.
The relay protection is based on the principle that the change of electrical quantity (current, voltage, power, frequency, etc.) when a short circuit or an abnormal condition occurs in an element in an electric power system constitutes a relay protection operation, and also includes other physical quantities such as a large amount of gas and an increase in oil flow speed or an increase in oil pressure intensity that are associated with a failure in a transformer tank. In most cases, a relay protection device includes a measurement unit (and a constant value adjustment unit), a logic unit, and an execution unit, regardless of the physical quantity to be reflected.
Parameters in the operation of the power system (e.g., current, voltage, power factor angle) are clearly distinguishable between normal operation and fault conditions. The relay protection device judges the nature and the range of the power system fault on the basis of reflection and detection by using the change of the parameters, and then makes corresponding reaction and processing (such as sending a warning signal or tripping a circuit breaker and the like).
An electric power line is a line used to transmit electric energy between a power plant, a substation, and an electric power consumer. It is an important component of a power supply system and is responsible for the task of delivering and distributing electrical energy. In the embodiment of the invention, the power transmission and distribution lines are lines between power transmission and distribution in the power system.
The relay protection device collects ADC data of a power line in real time through an external ADC chip, and when any continuous N point mutation quantity is larger than a mutation fixed value, fault judgment is started, and as shown in figure 1, a conventional overcurrent protection process is as follows:
firstly, starting a first mutation point as the starting time of fault data acquisition, namely the mutation amount at the time t1 (the mutation amount of N continuous mutation points is greater than a mutation fixed value);
secondly, the data collected from the time t1 to the time t2 is cycle fault data;
thirdly, starting to call a fast Fourier transform algorithm from the time t2 to the time t3 to calculate the current amplitude;
fourthly, judging whether the current amplitude is larger than an overcurrent fixed value or not according to the calculation result at the moment t3, and controlling a relay protection device to start an outlet signal for switching off a relay from the moment t3 to the moment t4 when the calculated current amplitude is larger than the overcurrent fixed value;
and fifthly, the relay is disconnected at the time t4, so that the effect of protecting the power line is achieved.
For a conventional overcurrent protection process, the time required from the collection of fault data to the last disconnection of the relay is from the time t1 to the time t4, but some products are complex to operate, the calculation process is complex, and the condition of insufficient time allowance of outlet action exists.
In order to solve the problem that the margin of the exit action time is insufficient, an embodiment of the invention provides a rapid exit method of a relay protection device, and with reference to fig. 1, after a cycle of fault data is collected, the current amplitude is calculated from the time t2 to the time t3, and the relay protection device is controlled to start outputting an exit signal for switching off a relay, that is, the exit signal is output t milliseconds in advance, so that the time for the relay to act can be advanced while the exit working time meets the margin requirement.
The relay action in the present application refers specifically to the relay opening action, since the present application is mainly directed to the fault opening, in the present application, the relay action or the relay opening means the same meaning.
Referring to fig. 2, it shows a flowchart of an implementation of the method for fast exporting a relay protection device according to an embodiment of the present invention, which is detailed as follows:
in S201, a cycle fault data of the power line protected by the relay protection device is collected, where the cycle fault data includes a fault current.
The acquired one-cycle fault data is fault data of one acquisition cycle, and as can be seen from fig. 1, the one-cycle fault data is fault data from time t1 to time t 2.
In one possible implementation, before collecting cycle fault data of a power line protected by a relay protection device, the method may further include:
acquiring ADC data of the power line in real time through an ADC chip;
extracting a mutation quantity in ADC data;
judging whether continuous N mutation quantities in ADC data are all larger than a mutation fixed value;
and if N continuous mutation amounts in the ADC data are all larger than the mutation fixed value, executing a cycle of fault data collecting step of the power line protected by the relay protection device.
Among them, ADC (Analog-to-Digital Converter) refers to a device for converting a continuously changing Analog signal into a discrete Digital signal, and the Analog signal in the real world, such as temperature, pressure, sound or image, needs to be converted into a Digital form which is easier to store, process and transmit.
In the embodiment of the invention, the relay protection device acquires the ADC data of the power line in real time through an external ADC analog-to-digital conversion chip.
The ADC data acquired in real time includes three-phase current of the power line
Three phase voltage
Zero sequence current
And zero sequence voltage
。
And extracting mutation quantities in the ADC data, wherein the mutation quantities can comprise mutation currents and mutation voltages.
Whether continuous N mutation amounts in the ADC data are larger than the mutation fixed value or not is judged, and N is generally selected to be 3 according to actual conditions, so that the accuracy of fault judgment can be guaranteed, and the judgment speed can be increased. However, different settings may be made according to products of different manufacturers, and in the embodiment of the present invention, N may be set to 3, or may be set to other positive integers greater than or equal to 3.
In the embodiment of the present invention, the mutation setting value is not specifically set, and the set mutation setting value is different according to the brand of the product.
The relay protection device obtains the ADC data of the power line through an external ADC digital-to-analog conversion chip, extracts the mutation amount in the ADC data, determines whether N consecutive mutation amounts are all greater than a mutation fixed value, and if so, executes S201.
In one possible implementation, the ADC data may include a current; the amount of the abrupt change may include an abrupt current; extracting the abrupt change in the ADC data may include:
if the current at the current moment meets a first formula, determining that the current at the current moment is an abrupt current;
the first formula is:
wherein the content of the first and second substances,
is Zhou BodikThe sudden change of current at a moment in time,
is the first cyclekThe sudden change in current at the moment in time,
is the first two cycleskAbrupt current at the moment.
The sudden change current is calculated by requiring sudden change currents at the same time of the current cycle, the previous cycle and the previous two cycles.
In the embodiment of the present invention, the abrupt change amount may include an abrupt change current, and may also include an abrupt change voltage, so that the abrupt change amount of the ADC data may be represented by the abrupt change current, and the abrupt change amount of the ADC data may also be highlighted by the abrupt change voltage, and a calculation formula of the abrupt change voltage is as follows:
wherein the content of the first and second substances,
zhou BodikThe sudden change in voltage at the moment of time,
is the first cyclekThe sudden change in voltage at the moment of time,
is the first two cycleskThe abrupt voltage at the moment.
In one possible implementation, the collecting of a cycle fault data of a power line protected by a relay protection device includes:
and collecting cycle fault data of the power line protected by the relay protection device from the first sudden change of the continuous N sudden change values larger than the sudden change set value.
When N continuous mutation amounts existing in ADC data are all larger than a mutation fixed value, a first mutation amount of the N continuous mutation amounts larger than the mutation fixed value is used as a fault data acquisition starting time to acquire one-cycle fault data, and the specific acquisition time refers to the time from t1 to t2 in FIG. 1.
And when mutation quantity which is not larger than the mutation fixed value exists in the continuous N mutation quantities in the ADC data at a certain moment, not starting a fault judgment process.
In S202, the current amplitude is calculated for one cycle fault data.
In one possible implementation, calculating the current amplitude for a cycle fault data includes:
and calculating the current amplitude of the cycle fault data by adopting a fast Fourier transform algorithm.
Among them, fast Fourier Transform (FFT) is a general term for an efficient and fast calculation method for calculating Discrete Fourier Transform (DFT) by using a computer. The fast fourier transform was proposed in 1965 by j.w. kuri and t.w. graph base. The multiplication times required by a computer for calculating the discrete Fourier transform can be greatly reduced by adopting the algorithm, and particularly, the more the number N of the transformed sampling points is, the more remarkable the calculation amount of the FFT algorithm is saved.
The basic idea of FFT is to decompose the original N-point sequence into a series of short sequences in turn. The symmetrical property and the periodic property of the exponential factors in the DFT calculation formula are fully utilized, and then the DFTs corresponding to the short sequences are calculated and properly combined, so that the aims of deleting repeated calculation, reducing multiplication and simplifying the structure are fulfilled. Then, fast algorithms such as high-basis and split-basis are developed on the basis of the thought, and with the rapid development of digital technology, a Winuiller Fourier Transform Algorithm (WFTA) and a prime factor Fourier transform algorithm which are established on the basis of number theory and polynomial theory appear in 1976. The common characteristic of the two methods is that when N is prime number, DFT calculation can be converted into cyclic convolution, thereby further reducing multiplication times and improving speed.
The specific FFT derivation procedure is as follows:
non-periodic continuous time signal
Can be expressed as
Calculated in equation (2) is the signal
Of the spectrum. However, in a practical control system, a continuous signal can be obtained
Of discrete sampled values
. It is therefore desirable to utilize discrete signals
To calculate the signal
Of the spectrum of (c).
Finite length discrete signal
，
The DFT of (1) is defined as:
will be provided with
Decomposed into the sum of two sequences of even and odd numbers, i.e.
Wherein
And
all have lengths of
，
Is a sequence of an even number of the sequences,
is an odd number sequence, then
The following formula can be derived:
due to the fact that
Then the formula of the FFT algorithm is as follows:
in the embodiment of the present invention, the current amplitude is calculated by using an FFT algorithm, which belongs to the prior art and is not described in detail herein.
The time length calculated by the FFT algorithm can be referred to from time t2 to time t3 in fig. 1.
In S203, the control relay protection device starts outputting the exit signal for controlling the relay to open after the calculation start time and before the calculation end time of the current amplitude.
Referring to fig. 3, when the relay input amount x is increased from 0 to x2, the output amount y is 0, when x = x2, the relay is operated, y = y1, when x is increased again, y is kept unchanged, and when x is decreased, y is 0. Wherein, x2 is the relay action value, and the input quantity x must be larger than or equal to x2 for the relay to act; x1 is a relay return value, and the input amount x must be less than or equal to x1 in order for the relay to return.
Referring to fig. 4, in the conventional action process of the relay, under the condition that no overcurrent occurs, when the GPIO outputs a low level, the optocoupler is conducted, the triode is conducted, the coil of the relay is electrified, and the relay is attracted by an electric shock;
under the condition that overcurrent occurs, when the GIPO outputs a high level, the optocoupler is not conducted, the triode is cut off, the coil of the relay is powered off, the contact is disconnected, and after the time of the GIPO outputting a low level exceeds a certain time, the relay can reliably act.
The general flow of the conventional operation of the relay protection device is shown in fig. 5.
When any continuous N point mutation amount is larger than the mutation fixed value, starting fault judgment, collecting one-cycle fault data, performing FFT calculation, performing protection logic calculation according to the calculated effective value of the current and the voltage, and starting the relay to act after the protection logic meets the action condition.
In the embodiment of the present invention, after the calculation start time of the current amplitude and before the calculation end time, the relay protection device is controlled in advance to output the exit signal of the relay action, and the relay protection device is started at time t in advance, specifically referring to fig. 6.
The outlet signal of the relay action is started at the moment t ahead of time, and the inherent action time of the relay is
Then the action time of the relay can be increased to
。
The time length of the advanced t moment is not more than the FFT calculation time length, the time length is obtained through a large number of calculation and experiments in practice, t is 5 milliseconds, the time length is most consistent with the action characteristic of the relay, and the action of the relay can be advanced.
In S204, it is determined whether the current magnitude is greater than a current threshold.
The current amplitude is obtained by calculating the acquired cycle wave fault data by adopting an FFT algorithm.
The current threshold, i.e. the threshold current, allows the maximum current to flow. The normal operation can be carried out under rated current, and the temperature can be rapidly increased when the threshold value is exceeded, so that the permanent damage is caused. Any appliance cannot operate at a constant current, allowing for up and down swings around the rated current. The swing amplitude cannot be too large and the upper and lower bounds of the good swing should not exceed the current threshold in the design.
Different brands of electric appliances, electric appliances made of different materials, electric appliances with different design requirements and the like have different requirements on the current threshold, and in the embodiment of the invention, the current threshold is not specifically limited.
In S205, if the current amplitude is greater than the current threshold, the outlet signal is continuously output to turn off the relay.
The conventional timing diagram of the relay action is shown as the waveform in fig. 7 (a), when no pulse compensation exists, when any continuous N point mutation quantity is larger than a mutation fixed value, fault judgment is started, one-cycle fault data is collected, a current amplitude is calculated by adopting FFT (fast Fourier transform), when the fault current amplitude is larger than an overcurrent threshold, an outlet signal is started to pass through a period of time T, and the relay reliably acts.
In the embodiment of the present invention, a timing diagram of an action of the relay during an overcurrent fault is shown as a waveform (b) in fig. 7, that is, a schematic diagram of a compensation action signal, after the start fault is determined, a current amplitude is calculated by using an FFT, and after the start time of the calculation of the current amplitude and before the end time of the calculation, the relay protection device is controlled to start outputting an outlet signal for controlling the relay to be disconnected, that is, the outlet signal for starting the relay is t ahead of time, and when it is determined that the current amplitude is greater than a current threshold, the relay protection device is controlled to continue outputting the outlet signal, and a period of time elapses
Then, the relay operates reliably.
In one possible implementation, if the current amplitude is greater than the current threshold, the outlet signal is continuously output to open the relay, and the method may further include:
and if the current amplitude is not greater than the current threshold, controlling the relay protection device to stop outputting the outlet signal.
As shown in the waveform of (c) of fig. 7, in order to start the fault determination process, the current amplitude after FFT calculation is smaller than the current threshold, and the timing diagram of the relay not needing to act is a schematic diagram of the compensation non-acting signal.
After the starting fault judgment, the current amplitude is calculated by adopting FFT, after the calculation starting time of the current amplitude and before the calculation finishing time, the relay protection device is controlled to start outputting an outlet signal for controlling the relay to be disconnected, namely the outlet signal for starting the relay t milliseconds in advance, if the current amplitude is judged to be smaller than the current threshold value, the outlet signal is cancelled, and the relay does not act.
The specific implementation flow diagram refers to fig. 8.
The invention provides a rapid exit method of a relay protection device, which can ensure the action accuracy of the relay protection device by collecting cycle wave fault data of a power line of the relay protection device and then calculating the cycle wave fault data, and simultaneously, after the calculation starting moment and the calculation finishing moment of a current amplitude, the relay protection device is controlled to start outputting an exit signal for controlling the relay to be disconnected, so that the relay protection device outputs the exit signal in advance, the action time of the relay protection device is shortened, and finally whether the current amplitude is greater than a current threshold value or not is judged, and if the current amplitude is greater than the current threshold value, the exit signal is continuously output, so that the relay is disconnected. The invention not only can calculate the current amplitude by collecting the one-cycle fault data to ensure the action accuracy of the relay protection device, but also can control the relay protection device to start outputting the outlet signal for controlling the action of the relay while calculating the current amplitude, and the relay protection device outputs the outlet signal in advance, thereby shortening the action time of the relay protection device.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.
Fig. 9 shows a schematic structural diagram of a fast exit device of a relay protection device provided in an embodiment of the present invention, and for convenience of description, only parts related to the embodiment of the present invention are shown, and details are as follows:
as shown in fig. 9, a rapid exit device 9 of a relay protection device includes: the device comprises an acquisition module 91, a calculation module 92, a first output module 93, a judgment module 94 and a second output module 95;
the acquisition module 91 is configured to acquire a cycle of wave fault data of the power line protected by the relay protection device, where the cycle of wave fault data includes a fault current;
a calculating module 92, configured to calculate a current amplitude for a cycle fault data;
the first output module 93 is used for controlling the relay protection device to start outputting an outlet signal for controlling the relay to be disconnected after the calculation starting moment and before the calculation finishing moment of the current amplitude;
a judging module 94, configured to judge whether the current amplitude is greater than a current threshold;
and a second output module 95, configured to continue outputting the outlet signal if the current amplitude is greater than the current threshold, so as to turn off the relay.
The invention provides a rapid outlet device of a relay protection device, which can ensure the action accuracy of the relay protection device by acquiring cycle wave fault data of a power line of the relay protection device and then calculating the cycle wave fault data, and meanwhile, after the calculation starting moment and the calculation finishing moment of a current amplitude, the relay protection device is controlled to start outputting an outlet signal for controlling the relay to be disconnected, so that the relay protection device outputs the outlet signal in advance, the action time of the relay protection device is shortened, and finally whether the current amplitude is greater than a current threshold value or not is judged, and if the current amplitude is greater than the current threshold value, the outlet signal is continuously output, so that the relay is disconnected. The invention not only can calculate the current amplitude by collecting the one-cycle fault data to ensure the action accuracy of the relay protection device, but also can control the relay protection device to start outputting the outlet signal for controlling the action of the relay while calculating the current amplitude, and the relay protection device outputs the outlet signal in advance, thereby shortening the action time of the relay protection device.
In a possible implementation manner, the apparatus may further include a failure determination module configured to:
acquiring ADC data of the power line in real time through an ADC chip;
extracting a mutation amount in ADC data;
judging whether N continuous mutation quantities in ADC data are all larger than a mutation fixed value;
if N continuous mutation amounts in ADC data are all larger than a mutation fixed value, executing an acquisition module
In one possible implementation, the ADC data may include a current; the amount of the abrupt change may include an abrupt current; the fault determination module may be further configured to:
if the current at the current moment meets a first formula, determining that the current at the current moment is an abrupt current;
the first formula is:
wherein the content of the first and second substances,
is Zhou BodikThe sudden change of current at a moment in time,
is the first cyclekThe sudden change of current at a moment in time,
is the first two cycleskAbrupt current at the moment.
In one possible implementation manner, the failure determination module may be configured to:
and collecting a cycle of fault data of the power line protected by the relay protection device from a first sudden change of the continuous N sudden change values larger than the sudden change fixed value.
In one possible implementation, the calculation module may be configured to:
and calculating the current amplitude of the cycle fault data by adopting a fast Fourier transform algorithm.
In one possible implementation manner, the second output module may be further configured to:
and if the current amplitude is not greater than the current threshold, controlling the relay protection device to stop outputting the outlet signal.
Fig. 10 is a schematic diagram of a terminal according to an embodiment of the present invention. As shown in fig. 10, the terminal 10 of this embodiment includes: a processor 100, a memory 101 and a computer program 102 stored in said memory 101 and executable on said processor 100. The processor 100 executes the computer program 102 to implement the steps in the embodiments of the quick exit method for each relay protection device, such as S201 to S205 shown in fig. 2. Alternatively, the processor 100, when executing the computer program 102, implements the functions of the modules/units in the above-mentioned device embodiments, such as the functions of the modules 91 to 95 shown in fig. 9.
Illustratively, the computer program 102 may be partitioned into one or more modules/units, which are stored in the memory 101 and executed by the processor 100 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 102 in the terminal 10. For example, the computer program 102 may be divided into the modules 91 to 95 shown in fig. 9.
The terminal 10 may be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The terminal 10 can include, but is not limited to, a processor 100, a memory 101. Those skilled in the art will appreciate that fig. 10 is only an example of a terminal 10 and does not constitute a limitation of the terminal 10, and that it may include more or less components than those shown, or some components in combination, or different components, e.g., the terminal may also include input output devices, network access devices, buses, etc.
The Processor 100 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 101 may be an internal storage unit of the terminal 10, such as a hard disk or a memory of the terminal 10. The memory 101 may also be an external storage device of the terminal 10, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), etc. provided on the terminal 10. Further, the memory 101 may also include both an internal storage unit and an external storage device of the terminal 10. The memory 101 is used for storing the computer program and other programs and data required by the terminal. The memory 101 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only used for distinguishing one functional unit from another, and are not used for limiting the protection scope of the present application. For the specific working processes of the units and modules in the system, reference may be made to the corresponding processes in the foregoing method embodiments, which are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the method according to the embodiments of the present invention may also be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the rapid exit method for each relay protection device may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U.S. disk, removable hard disk, magnetic diskette, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signal, telecommunications signal, and software distribution medium, etc. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A rapid exit method of a relay protection device is characterized by comprising the following steps:
collecting cycle fault data of a power line protected by a relay protection device, wherein the cycle fault data comprises fault current;
calculating the current amplitude of the one-cycle fault data;
after the calculation starting time of the current amplitude and before the calculation finishing time, controlling the relay protection device to start outputting an outlet signal for controlling the relay to be disconnected;
judging whether the current amplitude is larger than a current threshold value;
and if the current amplitude is larger than the current threshold value, continuously outputting the outlet signal to disconnect the relay.
2. The rapid exit method for relay protection device according to claim 1, wherein before the collecting a cycle fault data of the power line protected by the relay protection device, the method further comprises:
acquiring ADC data of the power line in real time through an ADC analog-to-digital conversion chip;
extracting a mutation quantity in the ADC data;
judging whether N continuous mutation quantities in the ADC data are all larger than a mutation fixed value;
and if N continuous mutation amounts are larger than the mutation fixed value in the ADC data, executing a cycle of fault data collecting step of the power line protected by the relay protection device.
3. The relay protection device fast-exit method according to claim 2, wherein the ADC data includes a current; the amount of the abrupt change comprises an abrupt change current; the extracting of the amount of mutation in the ADC data comprises:
if the current at the current moment meets a first formula, determining the current at the current moment as the abrupt current;
the first formula is:
wherein, the first and the second end of the pipe are connected with each other,
is Zhou BodikThe sudden change of current at a moment in time,
is the first cyclekThe sudden change in current at the moment in time,
is the first two cycleskAbrupt current at the moment.
4. The rapid exit method of a relay protection device according to claim 2, wherein the collecting a cycle fault data of a power line protected by the relay protection device comprises:
and collecting a cycle of fault data of the power line protected by the relay protection device from a first sudden change of the continuous N sudden change values larger than the sudden change fixed value.
5. The method for fast exiting of a relay protection device according to claim 1, wherein the calculating a current amplitude value for the one-cycle fault data includes:
and calculating the current amplitude of the one-cycle fault data by adopting a fast Fourier transform algorithm.
6. The method for fast-exiting a relay protection device according to claim 1, wherein if the current amplitude is greater than the current threshold, the exit signal is continuously outputted to open the relay, and the method further comprises:
and if the current amplitude is not greater than the current threshold, controlling the relay protection device to stop outputting the outlet signal.
7. A quick exit device of a relay protection device, comprising: the device comprises an acquisition module, a calculation module, a first output module, a judgment module and a second output module;
the acquisition module is used for acquiring cycle fault data of a power line protected by a relay protection device, wherein the cycle fault data comprises fault current;
the calculation module is used for calculating the current amplitude of the cycle fault data;
the first output module is used for controlling the relay protection device to start outputting an outlet signal for controlling the relay to be disconnected after the calculation starting time and before the calculation finishing time of the current amplitude;
the judging module is used for judging whether the current amplitude is larger than a current threshold value;
and the second output module is used for continuously outputting the outlet signal if the current amplitude is larger than the current threshold value so as to disconnect the relay.
8. The relay protection device rapid exit device according to claim 7, further comprising a failure determination module, wherein the failure determination module is configured to:
acquiring ADC data of the power line in real time through an ADC chip;
extracting a mutation amount in the ADC data;
judging whether N continuous mutation quantities in the ADC data are all larger than a mutation fixed value;
and if the N continuous mutation amounts in the ADC data are all larger than the mutation fixed value, executing the acquisition module.
9. A terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for rapid exit of a relay protection device according to any one of claims 1 to 6.
10. A computer-readable storage medium storing a computer program, wherein the computer program is executed by a processor to implement the steps of the rapid exit method of the relay protection device according to any one of claims 1 to 6.
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| CN117517755A (en) * | 2024-01-08 | 2024-02-06 | 石家庄科林电气股份有限公司 | Method for rapidly determining alternating current component in electric quantity and protection measurement and control safety device |
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