CN113820633B - Fuse specification determination method, system, terminal and medium for fusing overvoltage protection device - Google Patents
Fuse specification determination method, system, terminal and medium for fusing overvoltage protection device Download PDFInfo
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Abstract
The application relates to a fuse specification determining method, a system, a terminal and a medium of a fusing type overvoltage protection device, which belong to the technical field of overvoltage and insulation protection of a power system, and the fusing type overvoltage protection device comprises: the wire inlet end, the wire inlet end fuse FU1, the star-connected nonlinear resistor disc, the wire outlet end fuse FU2 and the wire outlet end are sequentially connected in series; the method comprises the following steps: acquiring parameters of a nonlinear resistor; generating a lightning impulse characteristic curve and a square wave current characteristic curve based on the parameters of the nonlinear resistor disc; determining a boundary curve based on the lightning impulse characteristic curve and the square wave current characteristic curve; and acquiring a candidate fuse selection specification curve, wherein the candidate fuse selection specification curve is used for determining whether the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement or not based on the position relation between the candidate fuse selection specification curve and the boundary curve. The fuse selection method has the effect of simplifying the fuse selection method of the fuse.
Description
Technical Field
The application relates to the technical field of overvoltage and insulation protection of power systems, in particular to a fuse specification determining method, a fuse specification determining system, a fuse specification determining terminal and a fuse specification determining medium of a fusing type overvoltage protection device.
Background
Overvoltage is a phenomenon that the voltage of part of lines or equipment exceeds a voltage rated value due to lightning strike, switching operation, fault or improper parameter matching and the like, and can damage devices in a power system.
At present, the engineering application usually adopts a structure design overvoltage protection device with nonlinear resistor sheets connected in series, the nonlinear resistor sheets are used as overvoltage suppression elements and are directly connected with buses or charged bodies to completely absorb energy of energy storage devices, various overvoltage effective damping of phase-phase and phase-ground can be suppressed at an extremely low level, and the overvoltage protection device can play a positive role in protecting insulating equipment such as a generator, a power transformer, a high-voltage motor and the like. In order to enable the overvoltage protection device to automatically withdraw from the system when the nonlinear resistor is damaged, struck by lightning, phase-to-ground short-circuited or phase-to-phase short-circuited, fuses are connected in series between the overvoltage protection device and the inlet and outlet terminals to form the fused overvoltage protection device.
If the fuse is not properly selected, the following may occur: when the fuse type overvoltage protection device passes a long-time large current and the current is smaller than a specified value, the fuse is not disconnected, but a nonlinear resistor sheet can be damaged, and the protection effect of the overvoltage protection device is affected; when the electric power system is subjected to transient lightning strike, the fuse is blown out prematurely, the overvoltage protection device is withdrawn from the system in advance, and devices in the electric power system are not effectively protected. Therefore, it is important to select an appropriate fuse type of the fuse. The existing fuse wire selection method generally considers a plurality of factors such as ambient temperature, normal working current, pulse, impact current and the like, and has complex algorithm and low applicability.
Disclosure of Invention
In order to simplify the fuse selection method of the fuse, the application provides a fuse specification determination method, a system, a terminal and a medium of a fusing type overvoltage protection device.
In a first aspect, the present application provides a fuse specification determination method of a fusing overvoltage protection device, the fusing overvoltage protection device including: the wire inlet end, the wire inlet end fuse FU1, the star-connected nonlinear resistor disc, the wire outlet end fuse FU2 and the wire outlet end are sequentially connected in series; the method comprises the following steps:
acquiring parameters of a nonlinear resistor;
generating a lightning impulse characteristic curve and a square wave current characteristic curve based on the parameters of the nonlinear resistor disc;
determining a boundary curve based on the lightning impulse characteristic curve and the square wave current characteristic curve;
and acquiring a candidate fuse selection specification curve, wherein the candidate fuse selection specification curve is used for determining whether the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement or not based on the position relation between the candidate fuse selection specification curve and the boundary curve.
By adopting the technical scheme, the lightning impulse characteristic curve and the square wave current characteristic curve are determined according to the existing parameters of the nonlinear resistor, and the boundary curve which is in accordance with the fuse specification is generated based on the two curves, so that whether the fuse specification of the candidate fuse meets the requirement can be judged rapidly through the relation between the curves, the proper fuse type of the fuse can be selected more intuitively and rapidly, the model selection method is simplified, and the working efficiency is improved.
Optionally, the determining the boundary curve based on the lightning impulse characteristic curve and the square wave current characteristic curve includes:
obtain the coordinates of point A，/>) And the coordinates of point B (+)>，/>) Wherein->For peak lightning impulse current->Rated for square wave current, ">、/>Sequentially the wave head time and the wave tail time of the lightning impulse characteristic curve;
substituting the coordinates of the point A and the point B into a preset boundary curve functionSolving boundary coefficients, wherein the boundary curve function +.>The method is characterized in that the constant melting heat value of the fuse is obtained;
boundary curve function based on boundary coefficient solvingAnd generating the boundary curve.
By adopting the technical scheme, the boundary curve function containing unknown coefficients is obtained according to the property of unchanged melting heat energy value of the fuseBased on boundary curve function->The characteristics of being capable of withstanding lightning impulse and fusing under the action of long-time high current can be solved by coordinates of point A and point B>To finally obtain the determined boundary curve function。
Optionally, the obtaining the candidate fuse selection specification curve is configured to determine whether the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement based on the positional relationship between the candidate fuse selection specification curve and the boundary curve, and includes:
acquiring points on the candidate fuse selection specification curveCoordinates (+)>，/>）；
If the specification curve of the candidate fuse wire passes through the point B andand if the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement.
By adopting the technical scheme, the points on the specification curve are selected by the candidate fuseThe position relation between the candidate fuse and the point A and whether the candidate fuse passes through the point B can be judged rapidly, whether the candidate fuse can withstand lightning impulse or not can be reliably fused when the candidate fuse is subjected to long-time current, and the judging process is simplified.
Optionally, the obtaining the candidate fuse selection specification curve is configured to determine whether the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement based on the positional relationship between the candidate fuse selection specification curve and the boundary curve, and includes:
acquiring points on the candidate fuse selection specification curveCoordinates (+)>) Dot->Coordinates (+)>，/>）；
Display points A, B, and pointAnd (4) point->For observation points->Above point A and point B and point +.>And overlapping to determine that the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement.
By adopting the technical scheme, the point A and the point B on the display boundary curve and the point on the candidate fuse wire selection specification curve are adoptedAnd (4) point->In a manner that facilitates observation of Point A, point B, point +.>And (4) point->And then can judge whether the fuse specification of the candidate fuse meets the requirement or not, simplify the judging process.
Optionally, the obtaining the candidate fuse selection specification curve is configured to determine whether the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement based on the positional relationship between the candidate fuse selection specification curve and the boundary curve, and includes:
displaying the lightning impulse characteristic curve, the square wave current characteristic curve, the boundary curve and a point B, wherein the boundary curve is parallel to the line starting from the point BAnd a boundary area is formed between the rays of the shaft and is used for observing that the candidate fuse selection specification curve passes through the point B and is positioned in the boundary area so as to determine that the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement.
By adopting the technical scheme, the boundary curve, the boundary area and the point B are jointly displayed, whether the fuse specification corresponding to the candidate fuse selection specification curve meets the requirements or not is conveniently determined, the selection speed is accelerated, and the working efficiency is improved.
In a second aspect, the present application further provides a fuse specification determination system of a fusing overvoltage protection device, including:
the first acquisition module is used for acquiring parameters of the nonlinear resistor;
the first generation module is used for generating a lightning impulse characteristic curve and a square wave current characteristic curve based on the parameters of the nonlinear resistor disc;
the second generation module is used for determining a boundary curve based on the lightning impulse characteristic curve and the square wave current characteristic curve;
the second acquisition module is used for acquiring a candidate fuse wire selection specification curve and determining whether fuse wire specifications corresponding to the candidate fuse wire selection specification curve meet requirements or not based on the position relation between the candidate fuse wire selection specification curve and the boundary curve.
By adopting the technical scheme, the system determines the lightning impulse characteristic curve and the square wave current characteristic curve according to the existing parameters of the nonlinear resistor, generates the boundary curve which represents the meeting of the fuse specification based on the two curves, more rapidly judges whether the candidate fuse meets the requirement or not according to the relation between the curves, can more intuitively and rapidly select the proper fuse type of the fuse, simplifies the type selection method and improves the working efficiency.
In a third aspect, the present application also provides an intelligent terminal comprising a memory and a processor, the memory having stored thereon a computer program capable of being loaded by the processor and performing the method according to any of the first aspects.
By adopting the technical scheme, the lightning impulse characteristic curve and the square wave current characteristic curve which can be determined by the processor according to the existing parameters of the nonlinear resistor sheet are stored in the memory, the boundary curve which represents the condition that the specification of the fuse is met is generated based on the two curves, whether the candidate fuse meets the requirement is judged more quickly through the relation between the curves, the proper fuse type of the fuse can be selected more intuitively and quickly, the model selecting method is simplified, and the working efficiency is improved.
In a fourth aspect, the present application also provides a computer readable storage medium storing a computer program capable of being loaded by a processor and performing any one of the methods of the first aspect.
By adopting the technical scheme, the readable storage medium stores the program which can be loaded and executed by the processor, the lightning impulse characteristic curve and the square wave current characteristic curve are determined according to the existing parameters of the nonlinear resistor sheet, the boundary curve which is represented to meet the fuse specification is generated based on the two curves, whether the candidate fuse meets the requirement is judged more quickly through the relation between the curves, the proper fuse type of the fuse can be selected more intuitively and quickly, the type selection method is simplified, and the working efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of a fuse type overvoltage protection device according to an embodiment of the present application.
Fig. 2 is a flowchart of a fuse specification determining method of a fusing type overvoltage protection device according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a boundary curve in an embodiment of the present application.
Fig. 4 is a schematic diagram of a positional relationship between points on a candidate fuse selection specification curve and a boundary curve in an embodiment of the present application.
Fig. 5 is a schematic diagram of a positional relationship between points on a candidate fuse selection specification curve and points on a boundary curve in an embodiment of the present application.
Fig. 6 is a schematic diagram of a positional relationship between a candidate fuse selection specification curve and a boundary region in an embodiment of the present application.
Fig. 7 is a schematic diagram of a fuse specification determining device of a fusing type overvoltage protection device according to an embodiment of the present application.
Fig. 8 is a schematic structural diagram of a smart terminal in an embodiment of the present application.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-8.
The present embodiment is only illustrative of the present application and is not intended to be limiting, and modifications may be made to the embodiment by those skilled in the art without creative contribution as needed after reading the present specification, but are protected by patent laws within the scope of the claims of the present application.
Embodiments of the present application are described in further detail below with reference to the drawings attached hereto.
Fig. 1 shows a fuse overvoltage protection device. Referring to fig. 1, the apparatus includes: the wire inlet end, the wire outlet end, the wire inlet end fuse FU1, the wire outlet end fuse FU2 and the star-shaped connecting nonlinear resistor disc with the neutral point.
The wire inlet end comprises three phases A1, B1 and C1, and the wire outlet end comprises three phases A2, B2 and C2. One end of each phase of wire inlet end and one end of wire outlet end are connected with an external system; the other end of each phase of wire inlet end is connected with the high voltage end of a wire inlet end fuse FU 1; the other end of each phase of wire outlet end is connected with the high voltage end of a wire outlet end fuse FU2, and the low voltage end of the wire inlet end fuse FU1 and the low voltage end of the wire outlet end fuse FU2 are connected with a non-linear resistor with a neutral point star connection.
The neutral star-shaped connection nonlinear resistor with the neutral point comprises nonlinear resistor pieces R1-R10, one ends of the nonlinear resistor pieces R1-R3 are respectively connected to the low-voltage end of the wire inlet end fuse FU1, one ends of the nonlinear resistor pieces R4-R6 are respectively connected to the low-voltage end of the wire outlet end fuse FU2, the other ends of the nonlinear resistor pieces R1 and R4 are respectively connected to one end of the nonlinear resistor piece R7, the other ends of the nonlinear resistor pieces R2 and R5 are respectively connected to one end of the nonlinear resistor piece R8, the other ends of the nonlinear resistor pieces R3 and R6 are respectively connected to one end of the nonlinear resistor piece R9, the other ends of the nonlinear resistor pieces R7-R9 are respectively connected to one end of the nonlinear resistor piece R10, and the other ends of the nonlinear resistor piece R10 are grounded. The end points of the nonlinear resistors R7 to R9 connected to the nonlinear resistor R10 are neutral points, and the voltage of the neutral points is zero.
When overvoltage is generated, the nonlinear resistor absorbs overvoltage energy generated when the system is overvoltage, after the overvoltage energy is released, the overvoltage value is reduced, the system is recovered to be normal, and a load end device is protected. Two nonlinear resistors are connected between each phase and the neutral point, and when one nonlinear resistor in each phase circuit fails, the rest nonlinear resistors also have the effect of absorbing energy generated by overvoltage, so that the overvoltage protection effect is optimized.
When one of the nonlinear resistor sheets is damaged or short-circuited occurs, the fuse fuses to protect the nonlinear resistor sheet and the load end when the branch where the nonlinear resistor sheet is located continuously generates a large current for a long time and the current is larger than the rated current of the fuse.
Referring to fig. 2, an embodiment of the present application provides a fuse specification determining method of a fusing type overvoltage protection device. The main flow of the method is described as follows (steps S100-S400):
step S100: acquiring parameters of a nonlinear resistor;
in this embodiment, the parameters of the nonlinear resistor include the wave head time of the lightning impulse currentWave tail time->Peak lightning impulse current->Square wave current rating->。
Step S200: generating a lightning impulse characteristic curve based on parameters of a nonlinear resistor discAnd square wave current characteristic curve->；
When the specification of the fuse wire is selected, the influence of lightning impulse current and the possible sustained current of the nonlinear resistor during short circuit on the fusing type overvoltage protection device needs to be considered, so that the waveform of induced lightning overcurrent generated on equipment during lightning strike in natural environment can be simulated by adopting standard lightning impulse characteristic waveforms, and the waveform of the possible sustained current of the nonlinear resistor during short circuit can be simulated by adopting square wave current-passing characteristic curves.
The analog pulse waveform of the impulse current test is required to be as close as possible to the waveform of the induced lightning overcurrent generated on equipment in the natural environment during lightning strike, and the standard lightning impulse characteristic waveform can be selected to be 1.2/50us or 8/20us. For example, an 8/20us shockwave has a wave head time of 8us, which means a time from a 10% peak to a 90% peak, and a half-peak time of 20us, which means a time from a wave head start point to a wave tail to a 50% peak.
In the selection of the fuse specification, the magnitude of the lightning current peak value is an important reference factor, so that in order to simplify the calculation, the application adopts a lightning impulse characteristic curve similar to the shape of the standard lightning current pulse waveformTo simulate lightning surge currents that may be encountered by a nonlinear resistor disc. Lightning impulse characteristic curve->Wave head time +.>Wave tail time->May be 1.2/50us or 8/20us, respectively.
Square wave current characteristic curveFor wave tail time->The square wave current characteristic curve h simulates the continuous current that the nonlinear resistor chip may be subjected to in the event of a short circuit, for a square wave of 2 ms. According to square wave current rating->Generating a square-wave current characteristic curve ∈ ->。
Typically, the parameter identification of the nonlinear resistor comprises bearable lightning impulse current peak valueSum square wave current rating>Lightning impulse characteristic curve->Wave head time +.>Wave tail time->These parameters. General->The values are 5kA, 10kA, 15kA,/for the patient>The values are generally 200A and 400A.
Step S300: based on lightning impulse characteristic curveAnd square wave current characteristic curve->Determining a boundary curve +.>；
Firstly, the fuse ampere-second characteristic curve in the actual working condition cannot be calculated by a formula, so that in order to facilitate selection, the embodiment of the application adopts a boundary curveThe fuse ampere-second characteristic curve of the fuse is simulated.
Can be based on the melting heat value of the fuseInvariable property design boundary curve function +.>Regarding all factors affecting the actual melting heat value of the fuse, such as temperature, material of the fuse, cross-sectional area of the fuse, narrow diameter of the fuse, etc., as coefficient b, regarding formula->Deforming to obtain->Or->Further deform into->Or->。
At this time, the coefficients Q and b need to be solved.
Next, referring to fig. 3, first, the coordinates of the point a are obtained，/>) And the coordinates of point B (+)>，/>) The method comprises the steps of carrying out a first treatment on the surface of the Wherein the point A is the peak point of lightning impulse current, and the melting heat energy value of the fuse is +.>Pulse which must be greater than point A +.>。
In addition, the fuse needs to be reliably blown under the action of a long-time high current, so that the fuse characteristic curve of the fuse meeting the requirement needs to be reduced to a square wave current-through characteristic curve within a period of timeIs below (c). The fuse is required to be blown again at least after receiving lightning currentThe fuse characteristic of the fuse is reduced to the square-wave current characteristic after passing point B>Is below (c).
Thus, the boundary curveIt is necessary to pass through point A and point B, boundary curve +.>Can represent the critical sizing profile of the fuse.
Finally, the coordinates of the A, B two points are substituted into the boundary curve functionOr->Solving Q and b to obtain the final boundary curve function +.>。
Step S400, obtaining a specification curve of candidate fuse selection of the fuseFor selecting specification curve based on candidate fuse>And boundary curve->The positional relationship between the two to determine the specification curve of candidate fuse selection>Whether the corresponding fuse specification meets the requirements.
If the specification curve of the candidate fuse wireIn the lightning impulse characteristic curve +.>Is>Inner boundary curve->Above and after passing point B, it drops to the square wave current characteristic curve +.>Is greater than the pulse +.A of point A>When the candidate fuse is used in a fuse-type overvoltage protection device, it can withstand lightning impulse current, does not fuse at least during the time of being subjected to lightning impulse, and fuses reliably when subjected to a large current for a long period of time. Therefore, the specification curve +.>And boundary curve->The position relation between the two is used for determining the specification curve +.>Whether the corresponding fuse specification meets the requirements.
Referring to FIG. 4, in one embodiment, observing candidate fuse selection specification curves may be employedPoint and boundary curve on->Determining a candidate fuse selection specification curve by means of the position relation between the fuse selection specification curve and the candidate fuse selection specification curve>Whether the corresponding fuse specification meets the requirements.
Obtaining candidate fuse wire selection specification curvePoint on->Coordinates (+)>，/>) The method comprises the steps of carrying out a first treatment on the surface of the Only candidate fuse selection specification curve +.>Pass through point B and->Candidate fuse selection specification curve +.>The corresponding fuse specifications are met.
It should be noted that the candidate fuse selection specification curve actually considers metering and measuring errorsThe distance error from point B in the direction parallel to the ordinate is small5% or more, namely, the specification curve of candidate fuse selection of the fuse>Passing through point B. Wherein the error is defined as->。
Wherein, judging the specification curve of the candidate fuse wire selectionWhether the point B passes or not, the abscissa of the point B is substituted into a candidate fuse selection specification curve function, and the ordinate of the point B are solved>Whether the absolute value between is within the error range or vice versa.
Referring to FIG. 5, in another embodiment, a candidate fuse selection specification curve may be obtained by observingPoint and boundary curve on->Determining candidate fuse selection specification curve +.>Whether the corresponding fuse specification meets the requirements.
First, a specification curve of candidate fuse selection is obtainedPoint on->Coordinates (+)>) Dot->Coordinates (+)>，/>）。
Then, points A, B, and point are displayed in rectangular coordinate systemAnd (4) point->Determining a candidate fuse selection specification curve if the following two conditions are satisfied simultaneously>The corresponding fuse specification meets the requirements:
(1) Point(s)Above point a;
(2) Point B and PointAnd (5) overlapping.
It should be noted that whenAnd->The absolute value error is less than or equal to 5%, namely point B and point +.>Coincidence, wherein error is defined as +.>。
Referring to FIG. 6, in another embodiment, the candidate fuse selection specification curve may also be obtained by observingDetermining candidate fuse selection specification curve +.>Whether the corresponding fuse specification meets the requirements.
Displaying lightning impulse characteristic curveSquare wave current characteristic curve->And boundary curve->And point B, boundary curve->And starting from point B and parallel to +.>Radiation of axis->Forming a boundary region therebetween. If a candidate fuse selection specification curve is observed +.>Passing through the point B and being located in the boundary area, the candidate fuse selection specification curve +.>The corresponding fuse specification meets the requirements; if the point B is not passed or the point B is not located in the boundary region, the candidate fuse selection specification curve +.>The corresponding fuse specifications are not satisfactory.
Likewise, candidate fuse selection specification curves are determined within an allowable error rangeWhether or not point B is passed.
For ease of viewing, the border region may be shaded, i.e., the diagonally shaded region in fig. 6; different colors can also be used for representing the lightning impulse characteristic curveSquare wave current characteristic curve->And boundary curve->。
In the case of displaying the lightning impulse characteristic curveAnd square wave current characteristic curve->In this case, a rectangular coordinate system with time on the abscissa and current on the ordinate needs to be established. Whereas the lightning impulse characteristic curve +.>And square wave current characteristic curve->The wave tail time of the two curves is greatly different, and in order to facilitate visual observation of the two curves, the actual gradient of the abscissa adopts a logarithmic coordinate, so that the two curves can be displayed in the same window.
In addition, candidate fuse selection specification curveThe rectangular coordinate system is generally time-ordinate and current-abscissa, so that the rectangular coordinate system needs to be unified before executing step S400.
Further, when the candidate fuse selection specification curve is obtainedPoint on->（/>) When (I)>Larger candidate fuse selection specification curve +.>The larger the melting heat value Q of the corresponding fuse is, the candidate fuse selection specification curve +.>The greater the degree of curvature of the fuse, the greater the load bearing capacity of the fuse. Therefore, if it is determined that the fuse specification suitable for the current fusing type overvoltage protection device is more than one by the above method, the candidate fuse selection specification curve can be observed>Bending or +.>The value size is chosen to select the optimal fuse specification.
In order to better implement the above method, the present application provides a fuse specification determination system for a blown overvoltage protection device. Referring to fig. 7, the fuse specification determination system 500 of the fusing type overvoltage protection device includes:
a first obtaining module 501, configured to obtain parameters of a nonlinear resistor;
the first generating module 502 is configured to generate a lightning impulse characteristic curve and a square wave current characteristic curve based on parameters of the nonlinear resistor;
a second generating module 503, configured to determine a boundary curve based on the lightning impulse characteristic curve and the square wave current characteristic curve;
the second obtaining module 504 is configured to obtain a candidate fuse selection specification curve, and determine whether a fuse specification corresponding to the candidate fuse selection specification curve meets a requirement based on a positional relationship between the candidate fuse selection specification curve and the boundary curve.
The various modifications and specific examples of the method in the foregoing embodiment are equally applicable to the fuse specification determination system of the fuse type overvoltage protection device of the present embodiment, and the implementation method of the fuse specification determination system of the fuse type overvoltage protection device of the present embodiment will be apparent to those skilled in the art from the foregoing detailed description of the fuse specification determination method of the fuse type overvoltage protection device, so that the detailed description thereof will not be repeated for the sake of brevity.
In order to better implement the above method, referring to fig. 8, the present application provides an intelligent terminal, where the intelligent terminal 600 may be a mobile phone, a PC, a tablet computer, a notebook computer, etc.; the intelligent terminal 600 includes a memory 601 and a processor 602, the memory 601 stores a computer program, and the processor 602 implements the above method when executing the program.
The memory 601 may be used to store instructions, programs, code, sets of codes, or sets of instructions. The memory 601 may include a storage program area and a storage data area, wherein the storage program area may store instructions for implementing an operating system, instructions for at least one function, instructions for implementing a fuse specification determination method of the fuse type overvoltage protection device provided by the above-described embodiment, and the like; the storage data area may store data and the like involved in the fuse specification determination method of the fusing type overvoltage protection device provided in the above embodiment.
The processor 602 may include one or more processing cores. The processor 602 performs various functions of the present application and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 601, invoking data stored in the memory 601. The processor 602 may be at least one of an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a digital signal processor (Digital Signal Processor, DSP), a digital signal processing device (Digital Signal Processing Device, DSPD), a programmable logic device (Programmable Logic Device, PLD), a field programmable gate array (Field Programmable Gate Array, FPGA), a central processing unit (Central Processing Unit, CPU), a controller, a microcontroller, and a microprocessor. It will be appreciated that the electronics for implementing the functions of the processor 602 described above may be other for different devices, and embodiments of the present application are not specifically limited.
The present embodiment provides a computer-readable storage medium storing a computer program capable of being loaded by a processor and executing the fuse specification determination method of the fusing type overvoltage protection device provided in the above embodiment.
In this embodiment, the computer-readable storage medium may be a tangible device that holds and stores instructions for use by the instruction execution device. The computer readable storage medium may be, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination of the preceding. In particular, the computer readable storage medium may be a portable computer disk, hard disk, USB flash disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), podium random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital Versatile Disk (DVD), memory stick, floppy disk, optical disk, magnetic disk, mechanical coding device, and any combination of the foregoing.
The computer program in this embodiment contains program code for executing the method shown in fig. 2, and the program code may include instructions corresponding to the execution of the steps of the method provided in the above embodiment. The computer program may be downloaded from a computer readable storage medium to the respective computing/processing device or to an external computer or external storage device via a network (e.g., the internet, a local area network, a wide area network, and/or a wireless network). The computer program may execute entirely on the user's computer and as a stand-alone software package.
In addition, it is to be understood that relational terms such as first and second are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (4)
1. A fuse specification determination method of a fusing type overvoltage protection device, characterized in that the fusing type overvoltage protection device includes: the wire inlet end, the wire inlet end fuse FU1, the star-connected nonlinear resistor disc, the wire outlet end fuse FU2 and the wire outlet end are sequentially connected in series; the method comprises the following steps:
acquiring parameters of a nonlinear resistor;
generating a lightning impulse characteristic curve and a square wave current characteristic curve based on the parameters of the nonlinear resistor disc;
determining a boundary curve based on the lightning impulse characteristic curve and the square wave current characteristic curve;
acquiring a candidate fuse selection specification curve, wherein the candidate fuse selection specification curve is used for determining whether fuse specifications corresponding to the candidate fuse selection specification curve meet requirements or not based on the position relationship between the candidate fuse selection specification curve and the boundary curve;
the determining a boundary curve based on the lightning impulse characteristic curve and the square wave current characteristic curve comprises:
obtain the coordinates of point A，/>) And the coordinates of point B (+)>，/>) Wherein->For peak lightning impulse current->Rated for square wave current, ">、/>Sequentially the wave head time and the wave tail time of the lightning impulse characteristic curve;
substituting the coordinates of the point A and the point B into a preset boundary curve functionSolving boundary coefficients, wherein the boundary curve function +.>The method is characterized in that the constant melting heat value of the fuse is obtained;
boundary curve function based on boundary coefficient solvingGenerating the boundary curve;
the obtaining the candidate fuse selection specification curve is used for determining whether the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement based on the position relationship between the candidate fuse selection specification curve and the boundary curve, and the method comprises the following steps:
acquiring points on the candidate fuse selection specification curveCoordinates (+)>，/>）；
If the specification curve of the candidate fuse wire passes through the point B andthe fuse specification corresponding to the candidate fuse selection specification curve meets the requirements;
candidate fuse selection specification curveIn a direction parallel to the ordinateThe distance error between the fuse and the point B is less than or equal to 5 percent, namely the fuse selection specification curve of the candidate fuse is regarded as +.>Passing through point B, wherein the error is defined as；
Or alternatively, the first and second heat exchangers may be,
acquiring points on the candidate fuse selection specification curveCoordinates (+)>) Dot->Coordinates (+)>，）；
Display points A, B, and pointAnd (4) point->For observation points->Above point A and point B and point +.>Overlapping to determine that the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement;
when (when)And->The absolute value error is less than or equal to 5%, namely point B and point +.>Coincidence, wherein error is defined as；
Or alternatively, the first and second heat exchangers may be,
displaying the lightning impulse characteristic curve, the square wave current characteristic curve, the boundary curve and a point B, wherein the boundary curve is parallel to the line starting from the point BAnd a boundary area is formed between the rays of the shaft and is used for observing that the candidate fuse selection specification curve passes through the point B and is positioned in the boundary area so as to determine that the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement.
2. A fuse specification determination system for a fused overvoltage protection device, comprising:
the first acquisition module is used for acquiring parameters of the nonlinear resistor;
the first generation module is used for generating a lightning impulse characteristic curve and a square wave current characteristic curve based on the parameters of the nonlinear resistor disc;
the second generation module is used for determining a boundary curve based on the lightning impulse characteristic curve and the square wave current characteristic curve;
the second acquisition module is used for acquiring a candidate fuse wire selection specification curve and determining whether fuse wire specifications corresponding to the candidate fuse wire selection specification curve meet requirements or not based on the position relationship between the candidate fuse wire selection specification curve and the boundary curve;
the second generating module is specifically configured to:
obtain the coordinates of point A，/>) And the coordinates of point B (+)>，/>) Wherein->For peak lightning impulse current->Rated for square wave current, ">、/>Sequentially the wave head time and the wave tail time of the lightning impulse characteristic curve;
substituting the coordinates of the point A and the point B into a preset boundary curve functionSolving boundary coefficients, wherein the boundary curve function +.>The method is characterized in that the constant melting heat value of the fuse is obtained;
boundary curve function based on boundary coefficient solvingGenerating the boundary curve;
the second obtaining module is specifically configured to:
acquiring points on the candidate fuse selection specification curveCoordinates (+)>，/>）；
If the specification curve of the candidate fuse wire passes through the point B andthe fuse specification corresponding to the candidate fuse selection specification curve meets the requirements;
candidate fuse selection specification curveThe error of the distance between the fuse and the point B in the direction parallel to the ordinate is less than or equal to 5 percent, namely the fuse selection specification curve of the candidate fuse is regarded as +.>Passing through point B, wherein the error is defined as；
Or alternatively, the first and second heat exchangers may be,
acquiring points on the candidate fuse selection specification curveCoordinates (+)>) Dot->Coordinates (+)>，）；
Display points A, B, and pointAnd (4) point->For observation points->Above point A and point B and point +.>Overlapping to determine that the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement;
when (when)And->The absolute value error is less than or equal to 5%, namely point B and point +.>Coincidence, wherein error is defined as；
Or alternatively, the first and second heat exchangers may be,
displaying the lightning impulse characteristic curve, the square wave current characteristic curve, the boundary curve and a point B, wherein the boundary curve is parallel to the line starting from the point BAnd a boundary area is formed between the rays of the shaft and is used for observing that the candidate fuse selection specification curve passes through the point B and is positioned in the boundary area so as to determine that the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement.
3. An intelligent terminal comprising a memory and a processor, said memory having stored thereon a computer program capable of being loaded by said processor and executing the method according to claim 1.
4. A computer readable storage medium, storing a computer program that can be loaded by a processor and that performs the method of claim 1.
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