CN116243231B - Current transformer abnormality alarm method and system considering light source power change - Google Patents
Current transformer abnormality alarm method and system considering light source power change Download PDFInfo
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- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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Abstract
The application discloses a current transformer abnormality warning method and a system taking light source power change into consideration, wherein the method comprises the following steps: selecting n driving currents and light source wavelengths corresponding to the n driving currents, and fitting according to a least square method to obtain a wavelength curve corresponding to the driving currents; acquiring rated current of the current transformer during operation and driving current of a light source corresponding to the rated current; according to the initial driving current of the light source during the initialization of the driving current and the current transformer, regulating the rated current during the operation of the current transformer to obtain a target rated current; setting a light weak steady state alarm fixed value and a light weak transient state alarm fixed value; and judging whether the average light intensity of the photoelectric detector in the current transformer is smaller than a light weak steady state alarm fixed value and a light weak transient state alarm fixed value. The problem that when the all-fiber current transformer runs near the average light intensity alarm threshold value, the measurement is triggered by large current, so that protection refuses to operate and even primary equipment is damaged is avoided.
Description
Technical Field
The application belongs to the technical field of current transformer abnormality analysis, and particularly relates to a current transformer abnormality alarm method and system considering light source power change.
Background
The all-fiber current transformer is widely applied to extra-high voltage converter stations in China due to the advantages of good insulating property, no saturation, wide frequency band, small volume, light weight and the like. The key components of the all-fiber current transformer comprise a light source, a modulator, a polarization maintaining fiber and the like, and the light source problem is the most important factor of the current all-fiber current transformer fault. Along with the extension of the operation time of the all-fiber current transformer, the power of a light source of the all-fiber current transformer is inevitably changed, so that the problem of measurement error of the all-fiber current transformer can be caused. In addition, although the logic of low power alarm of the light source is designed in the measurement abnormality alarm mechanism of the all-fiber current transformer, the problem that the measurement abnormality alarm is triggered by the average light intensity change sensed by the photoelectric detector when measuring currents with different magnitudes is not considered.
Therefore, the existing abnormal light intensity measurement alarm logic is the average light intensity received by the all-fiber current transformerLess than alarm fixed value->I.e. alarm, without taking into account the heavy current situation +.>The value will decrease.
Disclosure of Invention
The application provides a current transformer abnormality warning method and system considering light source power variationFor solving the problem of not considering the large currentThe value is reduced.
In a first aspect, the present application provides a method for alarming abnormality of a current transformer in consideration of power variation of a light source, including:
acquiring a driving current of a light source and a light source wavelength corresponding to the driving current;
selecting n driving currents and light source wavelengths corresponding to the n driving currents within a variation range of the allowed driving currents to obtain n points;
Fitting n points according to least square methodObtaining a wavelength curve corresponding to the driving current>Wherein->And->All are parameters;
acquiring rated current of a current transformer in operation and driving current x of the light source corresponding to the rated current;
according to the driving current x and the initial driving current of the light source when the current transformer is initializedRegulating rated current of the current transformer during operation to obtain target rated current;
the minimum average light intensity required to confirm the target rated currentAnd according to the minimum average light intensitySetting a light weakness steady state alarm fixed value +.>；
Calculating the maximum value of the measured currentAt the same time, the minimum value of the average light intensity +.>And according to the minimum valueSetting a light weak transient alarm fixed value +.>Wherein the light weak transient alarm constant value +.>Less than the steady state alarm fixed value of light weakness>And is greater than the minimum average light intensity +>；
Judging whether the average light intensity of the photoelectric detector in the current transformer is smaller than a steady state alarm fixed value of light weaknessAnd light weak transient alarm fixed value->；
If the average light intensity is smaller than the steady state alarm fixed value of light weaknessDelay t1 alarm, wherein t1 is larger than the measurement powerThe fastest action time of the main protection related to the stream;
if the average light intensity is smaller than the light weak transient state alarm fixed valueAnd delaying t2 to alarm, wherein t2 is smaller than the fastest action time of the main protection related to the measured current.
In a second aspect, the present application provides a current transformer abnormality warning system taking into account a change in power of a light source, comprising:
the first acquisition module is configured to acquire driving current of the light source and light source wavelength corresponding to the driving current;
a selection module configured to select n driving currents and light source wavelengths corresponding to the n driving currents within a variation range of the allowable driving currents to obtain n points;
A fitting module configured to fit n points according to a least square methodObtaining a wavelength curve corresponding to the driving currentWherein->And->All are parameters;
the second acquisition module is configured to acquire rated current of the current transformer during operation and driving current x of the light source corresponding to the rated current;
a regulating module configured to regulate the initial driving current of the light source according to the driving current x and the initial driving current of the current transformerFor the electricityThe rated current of the current transformer in operation is regulated to obtain a target rated current;
a determination module configured to determine a minimum average light intensity required for the target rated currentAnd according to said minimum average light intensity +.>Setting a light weakness steady state alarm fixed value +.>；
A calculation module configured to calculate a measurement current as a maximum valueAt the same time, the minimum value of the average light intensity +.>And according to said minimum +.>Setting a light weak transient alarm fixed value +.>Wherein the light weakness transient alert ratingLess than the steady state alarm fixed value of light weakness>And is greater than the minimum average light intensity +>；
The judging module is configured to judge whether the average light intensity of the photoelectric detector in the current transformer is smaller than a light weakness steady state alarm fixed valueAnd light weak transient alarm fixed value->；
A first alarm module configured to alarm a fixed value if the average light intensity is smaller than a steady state light intensityDelaying t1 to alarm, wherein t1 is larger than the fastest action time of the main protection related to the measured current;
a second alarm module configured to alarm if the average light intensity is smaller than a light-weak transient state alarm fixed valueAnd delaying t2 to alarm, wherein t2 is smaller than the fastest action time of the main protection related to the measured current.
In a third aspect, there is provided an electronic device, comprising: the system comprises at least one processor and a memory communicatively connected with the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the current transformer anomaly alerting method taking into account light source power variations of any of the embodiments of the present application.
In a fourth aspect, the present application also provides a computer readable storage medium having stored thereon a computer program, which when executed by a processor, causes the processor to perform the steps of the current transformer anomaly alerting method taking into account the variations in light source power of any of the embodiments of the present application.
According to the current transformer abnormality alarming method and system considering the light source power change, the influence of the light source driving current change on the Verdet constant is considered, the measured value is compensated in real time according to the light source driving current change, so that the measurement error is reduced, the requirement of measurement accuracy is met, the average light intensity reduction sensed by the photoelectric detector when the all-fiber current transformer measures large current is considered, the light weak transient alarming parameter is increased, and the problems that the measurement abnormality is triggered when the large current is measured when the all-fiber current transformer runs near the average light intensity alarming threshold value, protection is refused, and even primary equipment is damaged are avoided.
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In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a current transformer abnormality warning method considering light source power variation according to an embodiment of the present application;
FIG. 2 is a block diagram of an abnormality warning system for a current transformer according to an embodiment of the present application, which considers the power variation of a light source;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, a flowchart of a current transformer abnormality warning method taking into consideration a light source power variation according to the present application is shown.
As shown in fig. 1, the current transformer abnormality warning method considering the power change of the light source specifically includes the following steps:
step S101, obtaining a driving current of a light source and a light source wavelength corresponding to the driving current;
step S102, selecting n driving currents and the driving currents corresponding to the n driving currents within the allowable driving current variation rangeThe corresponding light source wavelength, n points are obtained。
Step S103, fitting n points according to the least square methodObtaining a wavelength curve corresponding to the driving currentWherein->And->Are parameters.
Step S104, obtaining rated current of the current transformer during operation and driving current x of the light source corresponding to the rated current.
Step S105, according to the driving current x and the initial driving current of the light source when the current transformer is initializedAnd regulating the rated current of the current transformer during operation to obtain a target rated current.
In the present embodiment, the driving current x and the initial driving current are setRespectively substituting the wavelength curvesAnd will be +.>Corresponding wavelength->And a wavelength corresponding to said driving current x +.>Comparing to obtain a proportionality coefficient;
and regulating rated current of the current transformer in operation according to the proportionality coefficient to obtain target rated current, wherein the expression for calculating the target rated current is as follows:
，
in the method, in the process of the application,for target rated current, +.>Is the rated current of the current transformer in operation.
The calculation parameters were calculatedAnd parameters->The expressions of (2) are respectively:
，
in the method, in the process of the application,for the ith drive current, < >>For the i-th wavelength, < >>For the measured driving current, ++number of corresponding wavelength points>For the average value of n drive currents, +.>Is the average value of n wavelengths, < >>For the 1 st wavelength>Is the 1 st drive current.
Step S106, confirming the minimum average light intensity required by the target rated currentAnd according to said minimum average light intensity +.>Setting a light weakness steady state alarm fixed value +.>。
In this embodiment, the light-weak steady-state alarm constant value is calculatedThe expression of (2) is:
，
in the method, in the process of the application,the value range is 1.05 to 1.5 for the reliability factor.
Step S107, calculating the maximum value of the measured currentAt the same time, the minimum value of the average light intensity +.>And according to said minimum +.>Setting a light weak transient alarm fixed value +.>Wherein the light weak transient alarm constant value +.>Less than the steady state alarm fixed value of light weakness>And is greater than the minimum average light intensity +>。
In the present embodiment, the measured current is calculated as the maximum value of the possible measured currentAt the same time, the minimum value of the average light intensity +.>And according to the minimum +.>Setting a light weak transient alarm fixed value +.>Calculating the light weak transient state alarm fixed valueThe expression of (2) is:
，
in the method, in the process of the application,the value range is 1.05 to 1.5 for the reliability factor.
Step S108, judging whether the average light intensity of the photoelectric detector in the current transformer is smaller than a steady state alarm fixed value of light weaknessAnd light weak transient alarm fixed value->。
Step S109, if the average light intensity is smaller than the steady state alarm fixed value of light weaknessAnd delaying t1 to alarm, wherein t1 is larger than the fastest action time of the main protection related to the measured current.
Step S110, if the average light intensity is smaller than the light weak transient alarm fixed valueAnd delaying t2 to alarm, wherein t2 is smaller than the fastest action time of the main protection related to the measured current.
In summary, the method of the application considers the influence of the light source driving current change on the Verdet constant, compensates the measured value in real time according to the light source driving current change, thereby reducing the measurement error, meeting the requirement of measurement precision, and considers the average light intensity decrease sensed by the photoelectric detector when the all-fiber current transformer measures large current to increase the light weak transient state alarming parameter, thereby avoiding the problem that the measurement abnormality is triggered when the large current is measured when the all-fiber current transformer runs near the average light intensity alarming threshold value, resulting in protection refusal and even primary equipment damage.
The all-fiber current transformer belongs to a passive electronic current transformer, and based on Faraday magneto-optical rotation effect, the phase change of polarized light in a magnetic field is measured in real time through a detector, and measured current information in proportional relation with a nonreciprocal phase difference is obtained through modulation and demodulation of an optical signal through a signal processing system.
The formula of the interference light intensity of the photoelectric detector in the all-fiber current transformer is as follows:
，（1）
in the method, in the process of the application,for interfering light intensity +.>For the light intensity of the light source->For sensing the number of turns of the optical fiber->Is the Verdet constant of the sensing fiber, +.>Is the value of the current flowing through the current carrying conductor.
The above formula is developed by the Bessel function to obtain the following formula:
，（2）
in the method, in the process of the application,for modulation factor, a fixed value during normal operation, < >>For phase shift +.>，/>For modulating the voltage frequency>For the moment of->Is->0 th order bessel function of +.>Is->2 n-th order Bessel function, +.>Is->2n-1 order Bessel function, < ->Is->N-th order bessel function of (c):
，（3）
in the method, in the process of the application,is->Is a factorial of (a);
the detector output signal of the all-fiber current transformer consists of infinite harmonics, each of which includes a phase offsetThe amplitudes of the first harmonic and the second harmonic of the effective information are respectively as follows:
，（4）
，（5）
in the method, in the process of the application,amplitude of one harmonic +.>Amplitude of second harmonic +.>For the photoelectric conversion coefficient of the detector,for transmission loss of the optical path->For the intensity of the light generated by the light source +.>Is->1 st order bessel function, +.>Is->Is a 2 nd order bessel function;
the compounds represented by the following formulas (4) and (5):
，（6）
i.e. the default sensing optical fiber turns when the all-fiber current transformer normally operatesVerdet constant of sensing fiberAnd modulation factor->For a fixed value, by the amplitude of the first harmonic after demodulation +.>Amplitude of second harmonic->The magnitude of the direct current is calculated.
The existing light weak alarm logic is used for calculating window timeThe average light intensity of the inner photodetector is smaller than a threshold valueAnd (5) delaying t1 to alarm.
，（7）
I.e.And (5) delaying the time t1 to alarm.
When the existing all-fiber current transformer adopts the method of (6) to calculate the direct current I, the Vilde constant of the sensing optical fiber is consideredIs a constant, actually the Wilde constant of the sensing fiber +.>The conventional method causes an increase in measurement error because the light power of the light source is changed.
When the all-fiber current transformer receives the average light intensitySlightly above threshold +.>When the current is near the rated current, the all-fiber current transformer can normally measure the current, and if primary equipment of the power system suddenly fails, the measured current suddenly increases to cause +.>Instantaneous drop, possibly below a threshold value +.>The all-fiber current transformer is warned and cannot be measured correctly, so that protection refuses to operate and primary equipment is damaged.
In one implementation, a light source driver and a spectrum analyzer are used to change the driving current x of the light source and measure the light source wavelength y at the corresponding driving current. The light source driving current variation range is from the minimum value to the maximum value of the allowed light source driving current when the all-fiber current transformer operates normally.
Selecting n points in the rangePerforming linear fitting by using least square method to obtain curve +.>。
Initializing the full-optical-fiber current transformer after being electrified, and recording the driving current at the momentAnd adjusting the proportionality coefficient to ensure that the measurement accuracy meets the requirement.
From the following componentsIt can be seen that +.>C is a constant. In operation, the light source wavelength is calculated according to the driving current x and the lambda=kx+b, so that +.>And substituting formula (6).
Is available in the form ofNamely, the accuracy of the all-fiber current transformer considering the change of the optical powerThe degree compensation method is to multiply the scaling factor on the basis of the original measurement value>。
And confirming the minimum average light intensity required by accurate measurement under rated current according to an all-fiber current transformer alarm parameter test.
Setting a steady state alarm fixed value of light weakness by considering the accuracy of measurement to be kept before the light weakness alarm，/>The value range is generally 1.05 to 1.5 for a reliable coefficient.
Calculating the measured current as the maximum value of the possible measured current according to the formula (2) and the formula (7)At the same time, the minimum value of the average light intensity +.> 。
Considering that the accuracy of measurement should be kept before the weak light alarm, setting a weak light transient alarm fixed value,，/>the value range is generally 1.05 to 1.5 for a reliable coefficient.
Should be ensuredLess than->And have a certain margin, and->Should be greater than +.>。
When the average light intensity is smaller thanDelay t1 alarm, when average light intensity is less than +.>The delay t2 is used for alarming, t2 is smaller than the fastest action time of the main protection related to the measuring current, and t1 is larger than the fastest action time of the main protection related to the measuring current.
Referring to fig. 2, a block diagram of a current transformer abnormality warning system that considers the power variation of a light source according to the present application is shown.
As shown in fig. 2, the current transformer abnormality alarm system 200 includes a first acquisition module 201, a selection module 202, a fitting module 203, a second acquisition module 204, an adjustment module 205, a determination module 206, a calculation module 207, a judgment module 208, a first alarm module 209, and a second alarm module 210.
Wherein, the first acquisition module 201 is configured to acquire a driving current of the light source and a light source wavelength corresponding to the driving current; a selection module 202 configured to select n driving currents and light source wavelengths corresponding to the n driving currents within a variation range of the allowable driving currents to obtain n pointsThe method comprises the steps of carrying out a first treatment on the surface of the A fitting module 203 configured to fit n points according to a least square methodObtaining a wavelength curve corresponding to the driving currentWherein->And->All are parameters; a second obtaining module 204 configured to obtain a rated current of the current transformer during operation and a driving current x of the light source corresponding to the rated current; a regulating module 205 configured to control the light source according to the driving current x and the initial driving current +_of the current transformer>Regulating rated current of the current transformer during operation to obtain target rated current; a determination module 206 configured to confirm the minimum average light intensity +.>And according to said minimum average light intensity +.>Setting a light-weak steady state alarm fixed valueThe method comprises the steps of carrying out a first treatment on the surface of the A calculation module 207 configured to calculate the measured current as a maximum value +.>At the same time, the minimum value of the average light intensity +.>And according to said minimum +.>Setting a light weak transient alarm fixed value +.>Wherein the light weakness transient alert ratingLess than the steady state alarm fixed value of light weakness>And is greater than the minimum average light intensity +>The method comprises the steps of carrying out a first treatment on the surface of the A judging module 208 configured to judge whether the average light intensity of the photodetectors in the current transformer is less than a steady state alarm fixed value of light weakness +.>And light weak transient alarm fixed value->The method comprises the steps of carrying out a first treatment on the surface of the A first alarm module 209 configured to alarm if the average light intensity is less than a steady state alarm threshold +.>Delaying t1 to alarm, wherein t1 is larger than the fastest action time of the main protection related to the measured current; a second alarm module 210 configured to alarm if the average light intensity is less than a light-weak transient alarm constant value +.>And delaying t2 to alarm, wherein t2 is smaller than the fastest action time of the main protection related to the measured current.
It should be understood that the modules depicted in fig. 2 correspond to the various steps in the method described with reference to fig. 1. Thus, the operations and features described above for the method and the corresponding technical effects are equally applicable to the modules in fig. 2, and are not described here again.
In other embodiments, embodiments of the present application further provide a computer readable storage medium having stored thereon a computer program, the program instructions, when executed by a processor, cause the processor to perform the current transformer anomaly alerting taking into account the light source power variation in any of the method embodiments described above;
as one embodiment, the computer-readable storage medium of the present application stores computer-executable instructions configured to:
acquiring a driving current of a light source and a light source wavelength corresponding to the driving current;
selecting n driving currents and n driving currents within the variation range of the allowed driving currentsThe light source wavelength corresponding to the driving current is obtained to obtain n points;
Fitting n points according to least square methodObtaining a wavelength curve corresponding to the driving current>Wherein->And->All are parameters;
acquiring rated current of a current transformer in operation and driving current x of the light source corresponding to the rated current;
according to the driving current x and the initial driving current of the light source when the current transformer is initializedRegulating rated current of the current transformer during operation to obtain target rated current;
the minimum average light intensity required to confirm the target rated currentAnd according to the minimum average light intensitySetting a light weakness steady state alarm fixed value +.>；
Calculating the maximum value of the measured currentAt the same time, the minimum value of the average light intensity +.>And according to the minimum valueSetting a light weak transient alarm fixed value +.>Wherein the light weak transient alarm constant value +.>Less than the steady state alarm fixed value of light weakness>And is greater than the minimum average light intensity +>；
Judging whether the average light intensity of the photoelectric detector in the current transformer is smaller than a steady state alarm fixed value of light weaknessAnd light weak transient alarm fixed value->；
If the average light intensity is smaller than the steady state alarm fixed value of light weaknessDelaying t1 to alarm, wherein t1 is larger than the fastest action time of the main protection related to the measured current;
if the average light intensity is smaller than the light weak transient state alarm fixed valueAnd delaying t2 to alarm, wherein t2 is smaller than the fastest action time of the main protection related to the measured current.
The computer readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created from the use of a current transformer anomaly alarm system that accounts for variations in light source power, and the like. In addition, the computer-readable storage medium may include high-speed random access memory, and may also include memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the computer readable storage medium optionally includes a memory remotely located with respect to the processor, the remote memory being connectable via a network to a current transformer anomaly alarm system that accounts for light source power variations. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present application, as shown in fig. 3, where the device includes: a processor 310 and a memory 320. The electronic device may further include: an input device 330 and an output device 340. The processor 310, memory 320, input device 330, and output device 340 may be connected by a bus or other means, for example in fig. 3. Memory 320 is the computer-readable storage medium described above. The processor 310 performs various functional applications of the server and data processing, i.e., current transformer anomaly alerting taking into account light source power variations, by running non-volatile software programs, instructions and modules stored in the memory 320. The input device 330 may receive input numerical or character information and generate key signal inputs related to user settings and function control of the current transformer abnormality alert system taking into account the light source power variation. The output device 340 may include a display device such as a display screen.
The electronic equipment can execute the method provided by the embodiment of the application, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be found in the methods provided in the embodiments of the present application.
As an implementation manner, the electronic device is applied to a current transformer abnormality alarm system considering a light source power change, and is used for a client, and includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
acquiring a driving current of a light source and a light source wavelength corresponding to the driving current;
selecting n driving currents and light source wavelengths corresponding to the n driving currents within a variation range of the allowed driving currents to obtain n points;
Fitting n points according to least square methodObtaining a wavelength curve corresponding to the driving current>Wherein->And->All are parameters;
acquiring rated current of a current transformer in operation and driving current x of the light source corresponding to the rated current;
according to the driving current x and the initial driving current of the light source when the current transformer is initializedRegulating rated current of the current transformer during operation to obtain target rated current;
the minimum average light intensity required to confirm the target rated currentAnd according to the minimum average light intensitySetting a light weakness steady state alarm fixed value +.>；
Calculating the maximum value of the measured currentAt the same time, the minimum value of the average light intensity +.>And according to the minimum valueSetting a light weak transient alarm fixed value +.>Wherein the light weak transient alarm constant value +.>Less than the steady state alarm fixed value of light weakness>And is greater than the minimum average light intensity +>；
Judging whether the average light intensity of the photoelectric detector in the current transformer is smaller than a steady state alarm fixed value of light weaknessAnd light weak transient alarm fixed value->；
If the average light intensity is smaller than the steady state alarm fixed value of light weaknessDelaying t1 to alarm, wherein t1 is larger than the fastest action time of the main protection related to the measured current;
if the average light intensity is smaller than the light weak transient state alarm fixed valueAnd delaying t2 to alarm, wherein t2 is smaller than the fastest action time of the main protection related to the measured current.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product, which may be stored in a computer-readable storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the various embodiments or methods of some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (7)
1. The current transformer abnormality warning method taking light source power change into consideration is characterized by comprising the following steps of:
acquiring a driving current of a light source and a light source wavelength corresponding to the driving current;
selecting n driving currents and light source wavelengths corresponding to the n driving currents within a variation range of the allowed driving currents to obtain n points (x 1 ，λ 1 )，(x 2 ，λ 2 )，(x 3 ，λ 3 )，……，(x n ，λ n )；
Fitting n points (x 1 ，λ 1 )，(x 2 ，λ 2 )，(x 3 ，λ 3 )，……，(x n ，λ n ) Obtaining a wavelength curve lambda=kx+b corresponding to the driving current, wherein k and b are parameters;
acquiring rated current of a current transformer in operation and driving current x of the light source corresponding to the rated current;
according to the driving current x and the initial driving current x of the light source when the current transformer is initialized 0 Regulating rated current of the current transformer during operation to obtain target rated current, wherein obtaining the target rated current comprises the following steps:
the driving current x and the initial driving current x 0 Respectively substituting into the wavelength curve lambda=kx+b and to be matched with the initial driving current x 0 Corresponding wavelength lambda ０ Obtaining a proportionality coefficient compared with a wavelength lambda corresponding to the driving current x;
and regulating rated current of the current transformer in operation according to the proportionality coefficient to obtain target rated current, wherein the expression for calculating the target rated current is as follows:
wherein I' is a target rated current, and I is the rated current when the current transformer operates;
the minimum average light intensity required to confirm the target rated currentAnd according to said minimum average light intensity +.>Setting a light weakness steady state alarm fixed value VSLOW1;
when the measured current is calculated to be the maximum value Imax, the minimum value of the average light intensityAnd according to said minimum +.>Setting a light weak transient state alarm fixed value VSLOW2, wherein the light weak transient state alarm fixed value VSLOW2 is smaller than a light weak steady state alarm fixed value VSLOW1 and larger than the minimum average light intensity +.>
Judging whether the average light intensity of a photoelectric detector in the current transformer is smaller than a light weak steady state alarm fixed value VSLOW1 and a light weak transient state alarm fixed value VSLOW2;
if the average light intensity is smaller than a light weak steady state alarm fixed value VSLOW1, delaying t1 to alarm, wherein t1 is larger than the fastest action time of main protection related to the measured current;
and if the average light intensity is smaller than a light weak transient alarm fixed value VSLOW2, delaying t2 for alarm, wherein t2 is smaller than the fastest action time of the main protection related to the measured current.
2. The current transformer abnormality warning method considering light source power variation according to claim 1, wherein expressions for calculating the parameter k and the parameter b are respectively:
wherein x is i Lambda for the ith drive current i For the i-th wavelength, n is the number of points corresponding to the measured drive current and wavelength,for the average value of n drive currents, +.>Is the average value of n wavelengths lambda 1 For the 1 st wavelength, x 1 Is the 1 st drive current.
3. The current transformer abnormality alarm method considering light source power variation according to claim 1, wherein the expression for calculating the light-weak steady-state alarm constant value VSLOW1 is:
wherein, alpha is a reliable coefficient and the value range is 1.05 to 1.5.
4. The current transformer abnormality warning method considering light source power variation according to claim 1, wherein the expression for calculating the light weak transient warning constant value VSLOW2 is:
wherein, beta is a reliable coefficient and the value range is 1.05 to 1.5.
5. A current transformer anomaly alarm system that accounts for variations in light source power, comprising:
the first acquisition module is configured to acquire driving current of the light source and light source wavelength corresponding to the driving current;
a selection module configured to select n driving currents and light source wavelengths corresponding to the n driving currents within a variation range of the allowable driving currents to obtain n points (x 1 ，λ 1 )，(x 2 ，λ 2 )，(x 3 ，λ 3 )，……，(x n ，λ n )；
A fitting module configured to fit n points (x 1 ，λ 1 )，(x 2 ，λ 2 )，(x 3 ，λ 3 )，……，(x n ，λ n ) Obtaining a wavelength curve lambda=kx+b corresponding to the driving current, wherein k and b are parameters;
the second acquisition module is configured to acquire rated current of the current transformer during operation and driving current x of the light source corresponding to the rated current;
the adjusting module is configured to adjust rated current of the current transformer in operation according to the driving current x and the initial driving current x0 of the light source when the current transformer is initialized to obtain a target rated current, wherein the obtaining the target rated current comprises:
the driving current x and the initial driving current x 0 Respectively substituting into the wavelength curve lambda=kx+b and to be matched with the initial driving current x 0 Corresponding wavelength lambda 0 Obtaining a proportionality coefficient compared with a wavelength lambda corresponding to the driving current x;
and regulating rated current of the current transformer in operation according to the proportionality coefficient to obtain target rated current, wherein the expression for calculating the target rated current is as follows:
wherein I' is a target rated current, and I is the rated current when the current transformer operates;
a determination module configured to determine a minimum average light intensity required for the target rated currentAnd according to said minimum average light intensity +.>Setting a light weakness steady state alarm fixed value VSLOW1;
a calculation module configured to calculate a minimum value of the average light intensity when the measured current is a maximum value ImaxAnd according to said minimum +.>Setting a light weak transient state alarm fixed value VSLOW2, wherein the light weak transient state alarm fixed value VSLOW2 is smaller than a light weak steady state alarm fixed value VSLOW1 and larger than the minimum average light intensity +.>
The judging module is configured to judge whether the average light intensity of the photoelectric detector in the current transformer is smaller than a light weak steady state alarm fixed value VSLOW1 and a light weak transient state alarm fixed value VSLOW2;
the first alarm module is configured to delay t1 to alarm if the average light intensity is smaller than a light weak steady state alarm fixed value VSLOW1, wherein t1 is larger than the fastest action time of main protection related to the measured current;
and the second alarm module is configured to delay t2 to alarm if the average light intensity is smaller than a light weak transient alarm fixed value VSLOW2, wherein t2 is smaller than the fastest action time of the main protection related to the measured current.
6. An electronic device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 4.
7. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method of any of claims 1 to 4.
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