CN113820633A - Fuse specification determination method, system, terminal and medium for fusing type overvoltage protection device - Google Patents
Fuse specification determination method, system, terminal and medium for fusing type overvoltage protection device Download PDFInfo
- Publication number
- CN113820633A CN113820633A CN202111081685.3A CN202111081685A CN113820633A CN 113820633 A CN113820633 A CN 113820633A CN 202111081685 A CN202111081685 A CN 202111081685A CN 113820633 A CN113820633 A CN 113820633A
- Authority
- CN
- China
- Prior art keywords
- fuse
- curve
- candidate
- point
- boundary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000006870 function Effects 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000010187 selection method Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 238000009413 insulation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 230000007935 neutral effect Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- 241001310793 Podium Species 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/74—Testing of fuses
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fuses (AREA)
Abstract
The application relates to a fuse specification determination method, a fuse specification determination system, a fuse specification determination terminal and a fuse specification determination medium of a fusing type overvoltage protection device, which belong to the technical field of overvoltage and insulation protection of a power system, wherein the fusing type overvoltage protection device comprises the following components: the system comprises a wire inlet end, a wire inlet end fuse FU1, a star-connected nonlinear resistor disc, a wire outlet end fuse FU2 and a wire outlet end which are sequentially connected in series; the method comprises the following steps: acquiring parameters of the nonlinear resistance card; generating a lightning impulse characteristic curve and a square wave through-current characteristic curve based on the parameters of the nonlinear resistance sheet; determining a boundary curve based on the lightning impulse characteristic curve and the square wave through-flow characteristic curve; and acquiring a candidate fuse selection specification curve of the fuse to determine 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 method has the effect of simplifying the fuse selection method of the fuse.
Description
Technical Field
The present disclosure relates to the field of power system overvoltage and insulation protection technologies, and in particular, to a method, a system, a terminal and a medium for determining a fuse specification of a fuse type overvoltage protection device.
Background
Overvoltage is a phenomenon in which a voltage of a part of a line or equipment exceeds a rated voltage value due to lightning strike, switching operation, failure, or mismatching of parameters, and the like, and may damage devices in an electric power system.
At present, the engineering application usually adopts a structure of serially connecting nonlinear resistance sheets to design an overvoltage protection device, the nonlinear resistance sheets are used as overvoltage suppression elements and are directly connected with a bus or a charged body to completely absorb energy of an energy storage device, various phase-phase and phase-ground overvoltages can be effectively damped and suppressed at an extremely low level, and the overvoltage protection device can play a positive protection role on insulating equipment such as a generator, a power transformer, a high-voltage motor and the like. In order to automatically withdraw the overvoltage protection device from the system when the nonlinear resistor disc is damaged, struck by lightning, short-circuited phase-to-ground or short-circuited phase-to-phase, fuses are connected in series between the overvoltage protection device and the incoming line end and the outgoing line end to form the fusing type overvoltage protection device.
If the selection of the fuse is not appropriate, the following may occur: when the fuse type overvoltage protection device passes through a large current for a long time and the current is smaller than a specified value, although the fuse is not disconnected, the nonlinear resistor disc can be damaged, and the protection effect of the overvoltage protection device is influenced; when the fuse is prematurely fused in the case of an instantaneous lightning strike, the overvoltage protection device is withdrawn from the system in advance, and the components in the power system are not effectively protected. Therefore, it is important to select the appropriate fuse type of the fuse. The existing fuse selection method of the fuse generally considers a plurality of factors such as environment 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 wire type selection method of the fuse, the application provides a fuse wire specification determination method, a system, a terminal and a medium of a fuse overvoltage protection device.
In a first aspect, the present application provides a method for determining a fuse specification of a blown overvoltage protection device, the blown overvoltage protection device comprising: the system comprises a wire inlet end, a wire inlet end fuse FU1, a star-connected nonlinear resistor disc, a wire outlet end fuse FU2 and a wire outlet end which are sequentially connected in series; the method comprises the following steps:
acquiring parameters of the nonlinear resistance card;
generating a lightning impulse characteristic curve and a square wave through-current characteristic curve based on the parameters of the nonlinear resistance sheet;
determining a boundary curve based on the lightning impulse characteristic curve and the square wave through-flow characteristic curve;
and acquiring a candidate fuse selection specification curve of the fuse to determine 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 through-flow characteristic curve are determined according to the existing parameters of the nonlinear resistance card, the boundary curve representing the specification of the fuse is generated based on the two curves, whether the fuse specification of the candidate fuse meets the requirement can be rapidly judged according to the relation between the curves, the appropriate fuse model of the fuse can be more intuitively and rapidly selected, the model selection method is simplified, and the working efficiency is improved.
Optionally, the determining a boundary curve based on the lightning impulse characteristic curve and the square wave through-current characteristic curve includes:
coordinates of point A are obtained (
，
) And coordinates of point B
，
) Wherein, in the step (A),
in order to obtain the peak value of the lightning impulse current,
for the nominal value of the square-wave current,
、
sequentially calculating 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 curveFunction(s)
Solving for boundary coefficients, wherein the boundary curve function
The fuse is obtained from the constant property of the melting heat energy value of the fuse;
boundary curve function based on solved boundary coefficients
Generating the boundary curve.
By adopting the technical scheme, the boundary curve function containing unknown coefficients is obtained according to the property that the melting heat energy value of the fuse is not changed
Based on boundary curve functions
The characteristic of the alloy which can withstand lightning impulse and be fused under the action of long-time large current can be solved by the coordinates of the point A and the point B
Finally obtaining the determined boundary curve function
。
Optionally, the obtaining a candidate fuse selection specification curve to determine whether the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement based on a position relationship between the candidate fuse selection specification curve and the boundary curve includes:
obtaining points on the fuse selection specification curve of the candidate fuse
Coordinates of (A), (B)
，
）；
If the candidate fuse selection specification curve passes through point B and
and if so, the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement.
By adopting the technical scheme, the selection type specification curve of the fuse wire of the candidate fuse is passed through the point
The position relation between the candidate fuse and the point A and whether the candidate fuse passes through the point B or not can be quickly judged whether the candidate fuse can bear the lightning impulse or not and whether the candidate fuse can be reliably fused or not when the candidate fuse bears the long-time current or not, and the judging process is simplified.
Optionally, the obtaining a candidate fuse selection specification curve to determine whether the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement based on a position relationship between the candidate fuse selection specification curve and the boundary curve includes:
obtaining points on the fuse selection specification curve of the candidate fuse
Coordinates of (A), (B)
) And a point
Coordinates of (A), (B)
，
）；
Displaying point A, point B, point
And point
For observation point
Located 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, points A and B on the display boundary curve and points on the candidate fuse selection specification curve are adopted
And point
In a manner convenient for observing points A, B, and B
And point
The position relation of the fuse wire can further quickly judge whether the fuse wire specification of the candidate fuse wire meets the requirement, and the judging process is simplified.
Optionally, the obtaining a candidate fuse selection specification curve to determine whether the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement based on a position relationship between the candidate fuse selection specification curve and the boundary curve includes:
displaying the lightning impulse characteristic curve, the square wave through-flow characteristic curve,The boundary curve and a point B, the boundary curve and the point B are taken as starting points and are parallel to
And 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 displayed together, so that whether the fuse specification corresponding to the candidate fuse specification curve meets the requirement or not is determined conveniently, the model selection speed is increased, and the working efficiency is improved.
In a second aspect, the present application further provides a fuse specification determining system for a blown overvoltage protection device, comprising:
the first acquisition module is used for acquiring parameters of the nonlinear resistance card;
the first generation module is used for generating a lightning impulse characteristic curve and a square wave through-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 through-current characteristic curve;
and the second acquisition module is used for acquiring a candidate fuse selection specification curve of the fuse and 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 system determines the lightning impulse characteristic curve and the square wave through-flow characteristic curve according to the existing parameters of the nonlinear resistance sheet, generates the boundary curve representing the specification of the fuse based on the two curves, judges whether the candidate fuse meets the requirement or not more quickly according to the relation between the curves, can select the appropriate fuse type of the fuse more intuitively and quickly, simplifies the type selection method and improves the working efficiency.
In a third aspect, the present application further provides an intelligent terminal, including a memory and a processor, where the memory stores thereon a computer program that can be loaded by the processor and execute any of the methods in the first aspect.
By adopting the technical scheme, the memory stores the characteristic curve of lightning impulse and the characteristic curve of square wave through-flow which can be determined by the processor according to the existing parameters of the nonlinear resistance card, and the boundary curve which represents the specification of the fuse is generated based on the two curves, whether the candidate fuse meets the requirement or not is judged more quickly according to the relation between the curves, the appropriate fuse type of the fuse can be selected more intuitively and quickly, the type selection 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 that can be loaded by a processor and executed to perform the method according to any of the first aspects.
By adopting the technical scheme, the readable storage medium stores a program which can be loaded and executed by the processor, the lightning impulse characteristic curve and the square wave through-flow characteristic curve are determined according to the existing parameters of the nonlinear resistor disc, the boundary curve representing the specification of the fuse is generated based on the two curves, whether the candidate fuse meets the requirement or not is judged more quickly according to the relation between the curves, the appropriate 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 in an embodiment of the present application.
FIG. 2 is a flow chart illustrating a method for determining fuse specifications of a blown overvoltage protection device according to an embodiment of the present disclosure.
Fig. 3 is a schematic diagram of a boundary curve in an embodiment of the present application.
FIG. 4 is a schematic diagram illustrating a positional relationship between a point on a fuse selection specification curve of a candidate fuse and a boundary curve in an embodiment of the present application.
Fig. 5 is a schematic diagram of a positional relationship between a point on a candidate fuse selection specification curve and a point on a boundary curve in the embodiment of the present application.
FIG. 6 is a schematic diagram illustrating a position relationship between a fuse selection specification curve of a candidate fuse and a boundary region according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of a fuse specification determining apparatus of the blow-out type overvoltage protector according to the embodiment of the present application.
Fig. 8 is a schematic structural diagram of an intelligent terminal in the embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to figures 1-8.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
The embodiments of the present application will be described in further detail with reference to the drawings attached hereto.
Fig. 1 shows a fuse type 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 connection non-linear resistance sheet with the neutral point.
The inlet end comprises three phases A1, B1 and C1, and the outlet end comprises three phases A2, B2 and C2. One end of each phase of the wire inlet end and the wire outlet end is connected with an external system; the other end of each phase wire inlet end is connected with a high-voltage end of a wire inlet end fuse FU 1; the other end of each phase of the 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 star-type connection non-linear resistance sheet with a neutral point.
The star connection nonlinear resistance card with the neutral point comprises nonlinear resistance cards R1-R10, one ends of the nonlinear resistance cards R1-R3 are connected to the low-voltage end of a wire inlet fuse FU1 respectively, one ends of the nonlinear resistance cards R4-R6 are connected to the low-voltage end of a wire outlet fuse FU2 respectively, the other ends of the nonlinear resistance cards R1 and R4 are connected to one end of the nonlinear resistance card R7, the other ends of the nonlinear resistance cards R2 and R5 are connected to one end of a nonlinear resistance card R8, the other ends of the nonlinear resistance cards R3 and R6 are connected to one end of a nonlinear resistance card R9, the other ends of the nonlinear resistance cards R7-R9 are connected to one end of a nonlinear resistance card R10, and the other end of a nonlinear resistance card R10 is grounded. One end point of each of the nonlinear resistance pieces R7 to R9 connected with the nonlinear resistance piece R10 is a neutral point, and the voltage of the neutral point is zero.
When overvoltage is generated, the nonlinear resistor disc absorbs overvoltage energy generated when the system is in overvoltage, and after the overvoltage energy is released, the overvoltage value is reduced, the system is recovered to be normal, and a device at a load end is protected. Two nonlinear resistance pieces are connected between each phase and the neutral point, and when one of the nonlinear resistance pieces in each phase circuit fails, the rest nonlinear resistance pieces also have the function of absorbing energy generated by overvoltage, so that the overvoltage protection effect is optimized.
When one of the nonlinear resistance cards is damaged or short circuit occurs, and the branch where the nonlinear resistance card is located continuously has larger current for a long time and is larger than the rated current of the fuse, the fuse is fused to protect the nonlinear resistance card and the load end.
Referring to fig. 2, an embodiment of the present application provides a method for determining a fuse specification of a blown overvoltage protection device. The main flow of the method is described as follows (steps S100 to S400):
step S100: acquiring parameters of the nonlinear resistance card;
in this embodiment, the parameters of the nonlinear resistor chip include wave head time of lightning impulse current
Wave tail time
Peak value of lightning impulse current
Square wave current rating
。
Step S200: parameter generation lightning impulse characteristic curve based on nonlinear resistance card
And square wave through-flow characteristic curve
；
When the specification of the fuse wire is selected, the influence of lightning impulse current and continuous current possibly borne by the nonlinear resistance chip 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 stroke in natural environment can be simulated by adopting a standard lightning impulse characteristic waveform, and the waveform of the continuous current possibly borne by the nonlinear resistance chip during short circuit can be simulated by adopting a square wave through-current characteristic curve.
The simulation pulse waveform of the surge current test is required to be as close as possible to the waveform of the induced lightning current generated on the equipment when the equipment is struck by lightning in the natural environment, and the generally selectable standard lightning surge characteristic waveform comprises 1.2/50us or 8/20 us. Taking 8/20us of shock wave as an example, the wave head time is 8us, which represents the time from 10% peak to 90% peak, and the half-peak time is 20us, which represents the time from the wave head start point to the wave tail to 50% peak.
When the specification of the fuse wire is selected, the size of the lightning current peak value is an important reference factor, so that the lightning impulse characteristic curve similar to the standard lightning current pulse waveform shape is adopted to simplify calculation
To simulate the lightning surge current that the non-linear resistive patch may encounter. Characteristic curve of lightning impulse
Wave head time of
And wave tail time
Can be respectively 1.2/50us or 8/20 us.
Square wave through-flow characteristic curve
Is the wave tail time
The square wave is a square wave of 2ms, and a square wave current characteristic curve h simulates continuous current which a nonlinear resistance chip can bear in short circuit. According to square-wave current rating
Generating a square wave flow characteristic curve
。
Usually, the parameter identification of the nonlinear resistance chip comprises bearable lightning impulse current peak value
And square wave current rating
Characteristic curve of lightning impulse
Wave head time of
And wave tail time
These parameters. In general
The value is 5kA, 10kA,15kA，
Values are typically 200A, 400A.
Step S300: based on the characteristic curve of lightning impulse
And square wave through-flow characteristic curve
Determining a boundary curve
；
First, the ampere-second characteristic curve of the fuse in the actual working condition cannot be calculated by a formula, so that, for convenience of type selection, a boundary curve is adopted in the embodiment of the application
And simulating the fuse ampere-second characteristic curve of the fuse.
Can be determined according to the heat energy value of fusion of the fuse
Invariant property design boundary curve function
Regarding all factors affecting the actual melting heat energy of the fuse, such as temperature, material of the fuse, cross-sectional area of the fuse, and narrow diameter of the fuse, as a coefficient b, a formula
Is deformed to obtain
Or
Further modified into
Or
。
At this time, the coefficients Q and b need to be solved.
Next, referring to fig. 3, first, the coordinates of point a are obtained (
，
) And coordinates of point B
，
) (ii) a Wherein, the point A is the peak point of the lightning impulse current and the melting heat energy value of the fuse
Pulse that must be greater than point A
。
In addition, the fuse needs to be reliably blown under the action of a large current for a long time, so that the fuse characteristic curve of the fuse meeting the requirement needs to be reduced to a square wave through-current characteristic curve within a period of time
Below (c). The fuse is melted at least after receiving lightning current, so that the fuse characteristic curve of the fuse meeting the requirement is reduced to the square wave through-current characteristic curve after passing through the point B
Below (c).
Thus, the boundaryCurve
Need to pass through points A and B, boundary curves
Can represent the critical profile of the fuse.
Finally, the coordinates of A, B two points are substituted into the boundary curve function
Or is or
Solving Q and b to obtain the final boundary curve function
。
Step S400, obtaining a selection specification curve of a fuse wire of a candidate fuse
For selecting a profile based on a fuse wire of a candidate fuse
And boundary curve
To determine the fuse selection specification curve of the candidate fuse
Whether the corresponding fuse specification meets the requirement or not.
Specification curve for fuse selection of candidate fuse
At characteristic curve of lightning impulse
Wave tail time of
Inner lying boundary curve
Upward and then decreases to the square wave through-flow characteristic curve after passing through point B
Then the pulse with the heat of fusion value Q of the candidate fuse being greater than point A
When the fuse candidate is used in a fusing type overvoltage protection device, it can withstand lightning surge current, does not fuse at least during the period of being subjected to lightning surge, and reliably fuses when subjected to a large current for a long time. Therefore, the selection specification curve of the fuse wire of the candidate fuse can be judged
And boundary curve
The position relation between the fuse wire and the fuse wire determines the selection specification curve of the fuse wire of the candidate fuse
Whether the corresponding fuse specification meets the requirement or not.
Referring to FIG. 4, in one embodiment, an observed candidate fuse profile may be used
Upper point and boundary curve
The mode of the position relation between the fuse wire and the fuse wire to determine the selection specification curve of the fuse wire of the candidate fuse
Whether the corresponding fuse specification meets the requirement or not.
Obtaining a selection specification curve of a fuse wire of a candidate fuse
Point of
Coordinates of (A), (B)
，
) (ii) a Selection specification curve of fuse wire of only candidate fuse
Passes through point B and
specification curve for fuse selection of candidate fuse
The corresponding fuse specification meets the requirements.
It should be noted that the fuse shape selection specification curve of the candidate fuse actually takes into account the metering and measurement errors
The distance error between the point B and 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
。
Wherein, the selection specification curve of the fuse wire of the candidate fuse is judged
If the point B passes through, the abscissa of the point B can be substituted into the fuse selection specification curve function of the candidate fuse, and the ordinate of the point B are solved
Whether the absolute value in between is within the error range and vice versa.
Referring to FIG. 5, in another embodiment, the selection profile of a candidate fuse can be observed
Upper point and boundary curve
Determining a fuse shape selection specification curve of the candidate fuse in the form of the positional relationship of the points
Whether the corresponding fuse specification meets the requirement or not.
Firstly, obtaining a fuse selection specification curve of a candidate fuse
Point of
Coordinates of (A), (B)
) And a point
Coordinates of (A), (B)
，
）。
Then, point A, point B, and point B are displayed in a rectangular coordinate system
And point
If the following two conditions are simultaneously met, determining the selection specification curve of the fuse wire of the candidate fuse
The corresponding fuse specification meets the requirements:
(1) dot
Above point a;
(2) point B and point
And (4) overlapping.
It should be noted that when
And
the absolute value error is less than or equal to 5%, and the points are regarded as point B and point
Coincidence, wherein the error is defined as
。
Referring to FIG. 6, in another embodiment, the selection profile of the fuse candidate may also be observed
And boundary regionDetermining the fuse selection specification curve of the candidate fuse by the position relation of the domains
Whether the corresponding fuse specification meets the requirement or not.
Displaying the lightning impulse characteristic curve
Square wave through-flow characteristic curve
And boundary curve
And point B, boundary curve
And starting from point B and parallel to
Radial of the shaft
Forming a boundary region therebetween. If the fuse selection specification curve of the candidate fuse is observed
Passing through point B and located in the boundary region, the fuse selection specification curve of the candidate fuse
The corresponding fuse specification meets the requirements; if the fuse wire does not pass through the point B or is not positioned in the boundary area, the fuse wire selection specification curve of the candidate fuse wire
The corresponding fuse specification is not satisfactory.
Similarly, the fuse selection gauge of the candidate fuse is judged within the allowable error rangeGrid curve
Whether point B is passed.
For the convenience of observation, a shadow may be set for the boundary region, i.e., a diagonally shaded region in fig. 6; different colors can also be adopted to represent the lightning impulse characteristic curve
Square wave through-flow characteristic curve
And boundary curve
。
It should be noted that the lightning impulse characteristic curve is displayed
And square wave through-flow characteristic curve
In time, a rectangular coordinate system with time as the abscissa and current as the ordinate needs to be established. And characteristic curve of lightning impulse
And square wave through-flow characteristic curve
The wave tail time difference is large, in order to facilitate the visual observation of the two curves, the actual gradient of the abscissa adopts logarithmic coordinates, so that the two curves can be displayed in the same window.
In addition, the fuse selection specification curve of the candidate fuse
The rectangular coordinate system used is generally time as ordinate and current as abscissa, so that the steps are performedThe coordinate system needs to be unified before S400.
Further, when obtaining the fuse selection specification curve of the candidate fuse
Point of
（
) When the temperature of the water is higher than the set temperature,
selection specification curve of fuse wire of candidate fuse
The larger the melting heat value Q of the corresponding fuse is, the larger the selection specification curve of the fuse wire of the candidate fuse is
The greater the degree of bending, the stronger the load-bearing capacity of the fuse. Therefore, if more than one fuse specification suitable for the current fusing type overvoltage protection device is determined by the method, the fuse specification selection curve of the candidate fuse can be observed
Of or of
The value is sized to select the optimal fuse specification.
To better implement the above method, the present application provides a fuse sizing system for a blown overvoltage protection device. Referring to fig. 7, a fuse specification determining system 500 of the blow-type overvoltage protector includes:
a first obtaining module 501, configured to obtain parameters of a nonlinear resistor disc;
the first generation module 502 is used for generating a lightning impulse characteristic curve and a square wave through-current characteristic curve based on the parameters of the nonlinear resistance sheet;
a second generating module 503, configured to determine a boundary curve based on the lightning impulse characteristic curve and the square wave through-current characteristic curve;
the second obtaining module 504 is configured to obtain a candidate fuse selection specification curve, and is configured to determine whether a fuse specification corresponding to the candidate fuse selection specification curve meets requirements based on a position relationship between the candidate fuse selection specification curve and the boundary curve.
Various modifications and specific examples of the method in the foregoing embodiments are also applicable to the fuse specification determining system of the blown overvoltage protection device in this embodiment, and the implementation method of the fuse specification determining system of the blown overvoltage protection device in this embodiment is clear to those skilled in the art from the foregoing detailed description of the fuse specification determining method of the blown overvoltage protection device, so for the brevity of the description, detailed descriptions are omitted here.
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, or the like; the intelligent terminal 600 comprises a memory 601 and a processor 602, wherein the memory 601 stores computer programs, and the processor 602 implements the method when executing the programs.
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, and instructions for implementing a fuse specification determination method of the blow-out overvoltage protection device provided by the above-described embodiments, and the like; the storage data area may store data and the like involved in the fuse specification determination method of the blown overvoltage protection device provided in the above embodiment.
Embodiments of the present application provide a computer-readable storage medium, which stores a computer program that can be loaded by a processor and execute the fuse specification determining method of the blown overvoltage protection device provided in the above embodiments.
In this embodiment, the computer readable storage medium may be a tangible device that retains and stores instructions for use by an instruction execution device. The computer readable storage medium may be, but is not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any combination of the foregoing. In particular, the computer readable storage medium may be a portable computer diskette, a hard disk, a U-disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a podium random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, an optical disk, a magnetic disk, a mechanical coding device, and any combination thereof.
The computer program in the present embodiment includes a program code for executing the method shown in fig. 2, and the program code may include instructions corresponding to the method steps provided in the foregoing embodiments. The computer program may be downloaded to the respective computing/processing device from a computer-readable storage medium, or may be downloaded to an external computer or external storage device via a network, such as 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, as a stand-alone software package.
In addition, it is to be understood that relational terms such as first and second, and the like, 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 above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A method for determining a fuse specification of a blow-out overvoltage protection device, the blow-out overvoltage protection device comprising: the system comprises a wire inlet end, a wire inlet end fuse FU1, a star-connected nonlinear resistor disc, a wire outlet end fuse FU2 and a wire outlet end which are sequentially connected in series; the method comprises the following steps:
acquiring parameters of the nonlinear resistance card;
generating a lightning impulse characteristic curve and a square wave through-current characteristic curve based on the parameters of the nonlinear resistance sheet;
determining a boundary curve based on the lightning impulse characteristic curve and the square wave through-flow characteristic curve;
and acquiring a candidate fuse selection specification curve of the fuse to determine 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.
2. The method of claim 1, wherein determining a boundary curve based on the lightning surge characteristic and a square wave current flow characteristic comprises:
coordinates of point A are obtained (
，
) And coordinates of point B
，
) Wherein, in the step (A),
in order to obtain the peak value of the lightning impulse current,
for the nominal value of the square-wave current,
、
sequentially calculating 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 function
Solving for boundary coefficients, wherein the boundary curve function
The fuse is obtained from the constant property of the melting heat energy value of the fuse;
boundary curve function based on solved boundary coefficients
Generating the boundary curve.
3. The method of claim 2, wherein obtaining the candidate fuse selection specification curve to determine 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 comprises:
obtaining points on the fuse selection specification curve of the candidate fuse
Coordinates of (A), (B)
，
）；
If the candidate fuse selection specification curve passes through point B and
and if so, the fuse specification corresponding to the candidate fuse selection specification curve meets the requirement.
4. The method of claim 2, wherein obtaining the candidate fuse selection specification curve to determine 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 comprises:
obtaining points on the fuse selection specification curve of the candidate fuse
Coordinates of (A), (B)
) And a point
Coordinates of (A), (B)
，
）；
Displaying point A, point B, point
And point
For observation point
Located 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.
5. The method of claim 2, wherein: the obtaining of 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 includes:
displaying the lightning impulse characteristic curve, the square wave through-current characteristic curve, the boundary curve and a point B, wherein the boundary curve takes the point B as a starting point and is parallel to the point B
And 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.
6. A fuse specification determining system for a blow-out overvoltage protection device, comprising:
the first acquisition module is used for acquiring parameters of the nonlinear resistance card;
the first generation module is used for generating a lightning impulse characteristic curve and a square wave through-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 through-current characteristic curve;
and the second acquisition module is used for acquiring a candidate fuse selection specification curve of the fuse and 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.
7. An intelligent terminal, comprising a memory and a processor, the memory having stored thereon a computer program that can be loaded by the processor and that executes the method according to any one of claims 1 to 5.
8. A computer-readable storage medium, in which a computer program is stored which can be loaded by a processor and which executes the method of any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111081685.3A CN113820633B (en) | 2021-09-15 | 2021-09-15 | Fuse specification determination method, system, terminal and medium for fusing overvoltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111081685.3A CN113820633B (en) | 2021-09-15 | 2021-09-15 | Fuse specification determination method, system, terminal and medium for fusing overvoltage protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113820633A true CN113820633A (en) | 2021-12-21 |
| CN113820633B CN113820633B (en) | 2024-02-27 |
Family
ID=78922593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111081685.3A Active CN113820633B (en) | 2021-09-15 | 2021-09-15 | Fuse specification determination method, system, terminal and medium for fusing overvoltage protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113820633B (en) |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1057367A (en) * | 1990-06-11 | 1991-12-25 | 长沙工程兵学院训练部三新技术开发研制所 | Fast overload and overcurrent fuse |
| EP0676845A1 (en) * | 1994-04-06 | 1995-10-11 | Cymem France Sarl | Overvoltage protection system |
| JP2000156930A (en) * | 1998-11-17 | 2000-06-06 | Toshiba Corp | Surge-detecting method and apparatus |
| US6141202A (en) * | 1998-08-07 | 2000-10-31 | Daimlerchrysler Ag | Method and apparatus for triggering a fuse |
| CN2604019Y (en) * | 2003-02-21 | 2004-02-18 | 刘政坤 | Transient state attack voltage suppressor |
| JP2005285717A (en) * | 2004-03-31 | 2005-10-13 | Matsushita Electric Ind Co Ltd | Circuit protection device |
| CN201690231U (en) * | 2010-04-13 | 2010-12-29 | 郭道胜 | Nonlinear neutral point ground resistor |
| CN102009474A (en) * | 2010-08-31 | 2011-04-13 | 浙江大学 | Method for testing welding quality of electro-fusion joint and realizing automatic evaluation |
| DE102012107525A1 (en) * | 2012-08-16 | 2014-02-20 | Phoenix Contact Gmbh & Co. Kg | Fuse failure display |
| CN204230882U (en) * | 2014-11-21 | 2015-03-25 | 国家电网公司 | A kind of 10 kv grid neutral earthing devices |
| CN105184070A (en) * | 2015-08-31 | 2015-12-23 | 华南理工大学 | Voltage integral method based segmentation fitting method for calculating volt-time characteristic curve |
| CN105591368A (en) * | 2015-12-31 | 2016-05-18 | 北京天诚同创电气有限公司 | Method and device for revising working parameters of fuse |
| CN106328375A (en) * | 2016-10-19 | 2017-01-11 | 华中科技大学 | Fuse parameter obtaining method for direct current filter capacitor |
| CN106546870A (en) * | 2016-11-24 | 2017-03-29 | 云南电网有限责任公司电力科学研究院 | A kind of high-voltage and current-limitation fuse transient shock test device |
| US20170363674A1 (en) * | 2016-06-20 | 2017-12-21 | Cooper Technologies Company | Monitoring systems and methods for detecting thermal-mechanical strain fatigue in an electrical fuse |
| CN107850633A (en) * | 2015-07-20 | 2018-03-27 | 库珀技术公司 | power fuse current sensing system and monitoring method |
| JP2018179633A (en) * | 2017-04-07 | 2018-11-15 | 日本電信電話株式会社 | Protective device selection system, device, method and program |
| CN109633364A (en) * | 2019-01-03 | 2019-04-16 | 广东电网有限责任公司 | A kind of mutual inductor winding and fuse failure appraisal procedure, device and equipment |
-
2021
- 2021-09-15 CN CN202111081685.3A patent/CN113820633B/en active Active
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1057367A (en) * | 1990-06-11 | 1991-12-25 | 长沙工程兵学院训练部三新技术开发研制所 | Fast overload and overcurrent fuse |
| EP0676845A1 (en) * | 1994-04-06 | 1995-10-11 | Cymem France Sarl | Overvoltage protection system |
| US6141202A (en) * | 1998-08-07 | 2000-10-31 | Daimlerchrysler Ag | Method and apparatus for triggering a fuse |
| JP2000156930A (en) * | 1998-11-17 | 2000-06-06 | Toshiba Corp | Surge-detecting method and apparatus |
| CN2604019Y (en) * | 2003-02-21 | 2004-02-18 | 刘政坤 | Transient state attack voltage suppressor |
| JP2005285717A (en) * | 2004-03-31 | 2005-10-13 | Matsushita Electric Ind Co Ltd | Circuit protection device |
| CN201690231U (en) * | 2010-04-13 | 2010-12-29 | 郭道胜 | Nonlinear neutral point ground resistor |
| CN102009474A (en) * | 2010-08-31 | 2011-04-13 | 浙江大学 | Method for testing welding quality of electro-fusion joint and realizing automatic evaluation |
| DE102012107525A1 (en) * | 2012-08-16 | 2014-02-20 | Phoenix Contact Gmbh & Co. Kg | Fuse failure display |
| CN204230882U (en) * | 2014-11-21 | 2015-03-25 | 国家电网公司 | A kind of 10 kv grid neutral earthing devices |
| CN107850633A (en) * | 2015-07-20 | 2018-03-27 | 库珀技术公司 | power fuse current sensing system and monitoring method |
| CN105184070A (en) * | 2015-08-31 | 2015-12-23 | 华南理工大学 | Voltage integral method based segmentation fitting method for calculating volt-time characteristic curve |
| CN105591368A (en) * | 2015-12-31 | 2016-05-18 | 北京天诚同创电气有限公司 | Method and device for revising working parameters of fuse |
| US20170363674A1 (en) * | 2016-06-20 | 2017-12-21 | Cooper Technologies Company | Monitoring systems and methods for detecting thermal-mechanical strain fatigue in an electrical fuse |
| CN106328375A (en) * | 2016-10-19 | 2017-01-11 | 华中科技大学 | Fuse parameter obtaining method for direct current filter capacitor |
| CN106546870A (en) * | 2016-11-24 | 2017-03-29 | 云南电网有限责任公司电力科学研究院 | A kind of high-voltage and current-limitation fuse transient shock test device |
| JP2018179633A (en) * | 2017-04-07 | 2018-11-15 | 日本電信電話株式会社 | Protective device selection system, device, method and program |
| CN109633364A (en) * | 2019-01-03 | 2019-04-16 | 广东电网有限责任公司 | A kind of mutual inductor winding and fuse failure appraisal procedure, device and equipment |
Non-Patent Citations (3)
| Title |
|---|
| LIU XING-FA: "High-voltage current-limiting fuse transient based on EMTP/ATP", JOURNAL PAPER * |
| 娄欣: "配电网压变熔丝熔断的研究", 硕士电子期刊出版工程科技Ⅱ辑 * |
| 石新国;王忠卿;: "压敏电阻在洗衣机控制板上的应用、选型及实践", 家电科技, no. 1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113820633B (en) | 2024-02-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zheng et al. | A transient protection scheme for HVDC transmission line | |
| Stanbury et al. | The impact of current-transformer saturation on transformer differential protection | |
| EP2596564B1 (en) | Method and arrangement for capacitor bank protection | |
| CN108020805B (en) | Ferromagnetic resonance judgment method and system for voltage transformer of power distribution network | |
| CN109633364B (en) | Mutual inductor winding and fuse fault assessment method, device and equipment | |
| CN109038489B (en) | High-voltage shunt reactor turn-to-turn fault protection method | |
| CN112710921A (en) | High-resistance fault line selection and section positioning method and system for resonance grounding system | |
| Raichura et al. | Development of an adaptive differential protection scheme for transformer during current transformer saturation and over‐fluxing condition | |
| CN103353572A (en) | Method for selecting T-junction circuit fault branch circuit based on branch circuit selection factor | |
| Lin et al. | Electromagnetic transient analysis and Novel protective relaying techniques for power transformers | |
| Santamaria | Analysis of power systems under fault conditions | |
| CN108957223B (en) | Under-compensation power distribution network single-phase high-resistance earth fault grounding phase identification method | |
| CN113820633A (en) | Fuse specification determination method, system, terminal and medium for fusing type overvoltage protection device | |
| Mehta et al. | Modelling of overcurrent relay with inverse characteristics for radial feeder protection using graphical user interface | |
| JP6824094B2 (en) | Protective device selection systems, devices, methods and programs | |
| Makwana et al. | Simulation and hardware implementation of over-current relay used for transmission lines | |
| CN110289595A (en) | A kind of the zero-sequence over-current protection setting method and relevant apparatus of high-impedance transformer | |
| CN114844001B (en) | Optimal design method and system for combined grounding mode of generator | |
| CN106443352B (en) | A kind of method of neutral point ungrounded electric network single-phase earth fault line selection | |
| Platero et al. | Novel adaptive 100% stator ground fault protection based on the third harmonic measurement | |
| Xukai et al. | Study on ferroresonance due to electromagnetic PT in ungrounded neutral system | |
| Kennedy et al. | Protection analysis tool for distribution networks with a high embedded generation penetration | |
| Mahdavipour Vahdati et al. | Synchronous generator stator protection using a fuzzy logic‐based voltage‐controlled overcurrent protection scheme | |
| CN112578310A (en) | Detection method for single-phase grounding line selection tripping function | |
| Egorova | ATP modeling of internal transformer faults for relay performance testing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |