CN109842086B - Arc sensor self-checking method and device based on triangular wave excitation source and arc protection equipment - Google Patents
Arc sensor self-checking method and device based on triangular wave excitation source and arc protection equipment Download PDFInfo
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Abstract
The invention discloses an arc light sensor self-checking method based on a triangular wave excitation source and a device corresponding to the method, which can realize on-off detection of a photosensitive element based on self-checking light, can also realize linearity detection of the photosensitive element according to the amplitude change rate of a detection signal output by the photosensitive element, and judge whether the aging degree of the photosensitive element reaches the standard or not through the linearity, thereby effectively solving the problem of aging detection of the photosensitive element; the invention also provides a circuit realization of the arc sensor self-checking device based on the triangular wave excitation source and arc protection equipment, which can be used for realizing on-off detection of the photosensitive element based on the self-checking light and realizing linearity detection of the photosensitive element according to the amplitude change rate of a detection signal output by the photosensitive element through the added self-checking light emitting unit and the detection light acquisition processing unit, and can also be applied to other more self-checking modes which are possibly realized based on the self-checking light.
Description
Technical Field
The invention belongs to the field of relay protection of a power system, relates to arc light protection of the power system, and particularly relates to an arc light sensor self-checking method and device based on a triangular wave excitation source and arc light protection equipment.
Background
At present, the bus protection of a medium-low voltage switch cabinet is mainly to remove the bus short-circuit fault by utilizing the overcurrent protection in the backup protection of a transformer. However, the method has the problem that the fault removal time is too long, so that the damage degree of equipment is increased. The basic principle of arc protection in power systems is to actuate a circuit breaker to protect a bus based on arc and current criteria. When the medium-low voltage bus breaks down, the protection can remove the fault before the arc light combustion damage is enlarged, so that the personnel safety is ensured, and the fault loss is reduced to the minimum. However, the arc protection device of the power system generally has the problems of sensor probe failure caused by external environmental factors such as surface rusts and the like and protection misoperation caused by optical axis deviation of the sensor or input light change, which reduce the sensitivity and reliability of arc protection. In order to avoid the problems, a self-checking function of a sensor probe is added in the arc protection, so that the sensor can realize a function of forecasting the possible fault of the sensor on the basis of keeping a stable working state, and the protection misoperation caused by the change of a light source is avoided.
The self-checking of the traditional arc sensor adopts a square wave signal as an excitation source, and the frequency and the duty ratio of the square wave signal are changed to control the frequency and the brightness intensity of the excitation source. The excitation source of the method only has bright and dark states, and the self-checking circuit can only carry out the self-checking of the sensor by taking the on-off state of the measuring channel as the basis. However, the photosensitive element belongs to an easily aging component, and aging of the photosensitive element can cause a fault prediction function and prevent a light source from changing to cause protection misoperation, so how to realize aging detection of the arc sensor becomes a key technical problem to be solved urgently.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides a self-checking method and a device corresponding to the method for the arc light sensor based on the triangular wave excitation source, which can not only realize on-off detection of the photosensitive element based on self-checking light, but also realize linearity detection of the photosensitive element according to the amplitude change rate of a detection signal output by the photosensitive element, and judge whether the aging degree of the photosensitive element reaches the standard or not through the linearity, thereby effectively solving the problem of aging detection of the photosensitive element; the invention also provides a circuit implementation and an arc protection device of the arc sensor self-checking device based on the triangular wave excitation source, which can provide basic hardware conditions for the arc sensor self-checking method based on the triangular wave excitation source through the addition of the self-checking light emitting unit and the detection light acquisition processing unit, thereby being used for realizing on-off detection of the photosensitive element based on the self-checking light, realizing linearity detection of the photosensitive element according to the amplitude change rate of the detection signal output by the photosensitive element, and being also applied to other more possible self-checking modes based on the self-checking light.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention provides an arc sensor self-checking method based on a triangular wave excitation source, which comprises the following implementation steps:
1) generating an excitation signal through a triangular wave excitation source to drive a light source to emit self-detection light to a photosensitive element of a target arc sensor, so that the self-detection light flickers at a fixed frequency f and the brightness changes continuously according to the amplitude of the excitation signal;
2) judging whether a detection signal output by a photosensitive element of the target arc sensor is received or not, and if the detection signal is received, skipping to execute the step 3); otherwise, judging the failure of the target arc sensor equipment and quitting;
3) acquiring the amplitude change rate of a detection signal output by a photosensitive element of the target arc sensor, judging whether the amplitude change rate of an excitation signal and the amplitude change rate of the detection signal are consistent, and if so, judging that the linearity of the photosensitive element reaches the standard; otherwise, the linearity of the photosensitive element is judged not to reach the standard.
Optionally, the step 3) further includes a step of comparing the amplitude of the detection signal with a preset threshold, and if the amplitude of the detection signal is greater than the preset threshold, the detection signal output by the photosensitive element of the target arc sensor is determined to be an arc signal, and the target arc sensor can normally receive the arc signal.
Optionally, the step 3) further includes a step of distinguishing whether the detection signal output by the photosensitive element of the target arc sensor is self-detection light or environmental interference light according to the amplitude and the frequency of the detection signal, and if the detection signal output by the photosensitive element is self-detection light or environmental interference light, it is determined that the target arc sensor can normally receive the self-detection light or the environmental interference light.
Optionally, the detailed step of outputting the detection signal of the photosensitive element of the target-distinguishing arc sensor as self-detection light or environmental interference light includes: judging whether the amplitude and the frequency of the detection signal and the self-detection light are consistent or not, and if so, judging that the detection signal output by the photosensitive element of the target arc sensor is the self-detection light; otherwise, the detection signal output by the photosensitive element of the target arc sensor is judged to be the environmental interference light.
Optionally, the excitation signal generated by the triangular wave excitation source in step 1) is a PWM signal, and the light source driven by the excitation signal is an L ED light source.
The invention also provides an arc sensor self-checking method based on the triangular wave excitation source, which is characterized by comprising the step of detecting the linearity of a photosensitive element of the target arc sensor, and the specific implementation steps comprise: generating an excitation signal through a triangular wave excitation source to drive a light source to emit self-detection light to a photosensitive element of a target arc sensor, so that the self-detection light flickers at a fixed frequency f and the brightness changes continuously according to the amplitude of the excitation signal; acquiring the amplitude change rate of a detection signal output by a photosensitive element of the target arc sensor; and judging whether the amplitude change rate of the excitation signal and the amplitude change rate of the detection signal are consistent, if so, judging that the linearity of the photosensitive element reaches the standard, otherwise, judging that the linearity of the photosensitive element does not reach the standard.
The invention also provides an arc sensor self-checking device based on the triangular wave excitation source, which comprises a microprocessor, wherein the microprocessor is programmed to execute the steps of the arc sensor self-checking method based on the triangular wave excitation source; or a storage medium connected with the microprocessor is stored with a computer program which is programmed to execute the self-detection method of the arc sensor based on the triangular wave excitation source.
The present invention also provides a computer readable storage medium having stored therein a computer program programmed to execute the aforementioned method for triangular wave excitation source-based arc sensor self-test.
The invention also provides an arc light sensor self-checking device based on the triangular wave excitation source, which comprises a self-checking light emitting unit and a detection light collecting and processing unit, wherein the self-checking light emitting unit comprises a triangular wave driving circuit and a light source which are mutually connected, the detection light collecting and processing unit comprises a sampling circuit, an AD conversion circuit and a main control unit which are sequentially connected, the input end of the sampling circuit is used for being connected with the output end of a photosensitive element of the target arc light sensor, and the output end of the sampling circuit is sequentially connected with the main control unit through the sampling circuit and the AD conversion circuit.
Optionally, the light source is arranged on one side of a photosensitive element of the target arc sensor.
Optionally, the triangular wave driving circuit includes a multivibrator and an integrating circuit, and a duty ratio adjusting circuit is connected to the multivibrator.
Optionally, the main control unit is programmed to execute the steps of the arc sensor self-test method based on the triangular wave excitation source; or a storage medium connected with the main control unit is stored with a computer program programmed to execute the self-test method of the arc sensor based on the triangular wave excitation source.
The invention also provides arc protection equipment which is provided with the arc sensor and is also provided with the arc sensor self-checking device based on the triangular wave excitation source.
Compared with the prior art, the arc sensor self-checking method based on the triangular wave excitation source and the device corresponding to the method have the following advantages: the invention can realize on-off detection of the photosensitive element based on self-checking light, can also realize linearity detection of the photosensitive element according to the amplitude change rate of a detection signal output by the photosensitive element, and judges whether the aging degree of the photosensitive element reaches the standard or not according to the linearity, thereby effectively solving the problem of aging detection of the photosensitive element.
Compared with the prior art, the arc sensor self-checking device based on the triangular wave excitation source has the advantages that: the self-detection light emitting unit and the detection light acquisition and processing unit can provide basic hardware conditions for the arc sensor self-detection method based on the triangular wave excitation source, so that the method is used for realizing on-off detection of the photosensitive element based on the self-detection light, realizing linearity detection of the photosensitive element according to the amplitude change rate of a detection signal output by the photosensitive element, and can be applied to other more self-detection modes possibly realized based on the self-detection light.
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FIG. 1 is a schematic diagram of a method according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a self-testing light emitting unit according to an embodiment of the invention.
FIG. 4 is a diagram illustrating comparison of current waveforms of various signals according to one embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating a quantization principle of the AD conversion circuit according to the first embodiment of the present invention.
Illustration of the drawings: 1. a self-test light emitting unit; 2. a detection light acquisition and processing unit; 21. a sampling circuit; 22. an AD conversion circuit; 23. and a main control unit.
Detailed Description
The first embodiment is as follows:
as shown in fig. 1, the implementation steps of the arc sensor self-testing method based on the triangular wave excitation source of the embodiment include:
1) generating an excitation signal through a triangular wave excitation source to drive a light source to emit self-detection light to a photosensitive element of a target arc sensor, so that the self-detection light flickers at a fixed frequency f and the brightness changes continuously according to the amplitude of the excitation signal;
2) judging whether a detection signal output by a photosensitive element of the target arc sensor is received or not, and if the detection signal is received, skipping to execute the step 3); otherwise, judging the failure of the target arc sensor equipment and quitting;
3) acquiring the amplitude change rate of a detection signal output by a photosensitive element of the target arc sensor, judging whether the amplitude change rate of an excitation signal and the amplitude change rate (namely slope) of the detection signal are consistent or not, and judging that the linearity of the photosensitive element reaches the standard if the amplitude change rate of the excitation signal and the amplitude change rate (namely slope) of the detection signal are consistent; otherwise, judging that the linearity of the photosensitive element does not reach the standard;
in this embodiment, the excitation signal generated by the triangular wave excitation source in step 1) is a PWM signal, and the light source driven by the excitation signal is an L ED light source.
In this embodiment, the step 3) further includes a step of comparing the amplitude of the detection signal with a preset threshold, and if the amplitude of the detection signal is greater than the preset threshold, it is determined that the detection signal output by the photosensitive element of the target arc sensor is an arc signal, and the target arc sensor can normally receive the arc signal.
In this embodiment, the step 3) further includes a step of distinguishing whether the detection signal output by the photosensor of the target arc sensor is self-detection light or environmental interference light according to the amplitude and the frequency of the detection signal, and if the detection signal output by the photosensor is self-detection light or environmental interference light, it is determined that the target arc sensor can normally receive the self-detection light or the environmental interference light.
It should be noted that, the sequence of each step of the detection and judgment in step 3) may be adjusted according to the need, and the actual sequence shown in fig. 1 is only an example of the sequence preferably adopted in this embodiment.
In this embodiment, when determining whether the amplitude change rate of the excitation signal and the amplitude change rate of the detection signal are the same in step 4), specifically, determining whether an error between the amplitude change rate of the excitation signal and the amplitude change rate of the detection signal is smaller than a preset threshold, where the preset threshold is specifically set to ± 20%, and if the rising or falling slope of the triangular wave is normalized and is equal to 1, the amplitude change rate of the detection signal is within 0.8-1.2 of the amplitude change rate of the excitation signal, which indicates that the linearity of the sensor meets the requirement. Undoubtedly, when the preset threshold value is 0, it is determined whether the amplitude change rate of the excitation signal and the amplitude change rate of the detection signal are the same. Different from the currently common self-checking method using square waves as the excitation source, the present embodiment uses triangular waves as the excitation source, and can constantly measure the frequency of the self-checking light source and measure the linearity of the amplitude change of the light source. Therefore, the on-off and sampling precision of the arc sensor measuring loop is judged simultaneously. Assuming that the light intensity data of the detection signal is stored in the light intensity array A [ N ], the linearity of the light intensity at a certain time is expressed by the differential value dA/dt of the amplitude, and can be expressed as:
in the above formula, dA/dt represents the amplitude change rate of the detection signal at the time K, A [ K ]]For the value sampled at time K, A [ K-M ]]Sampled values of M sampling intervals before time K, TsIs the sampling period.
In this embodiment, the detailed steps of distinguishing the detection signal output by the photosensitive element of the target arc sensor as the self-detection light or the environmental interference light include: judging whether the amplitude and the frequency of the detection signal and the self-detection light are consistent or not, and if so, judging that the detection signal output by the photosensitive element of the target arc sensor is the self-detection light; otherwise, the detection signal output by the photosensitive element of the target arc sensor is judged to be the environmental interference light.
The arc light sensor is generally installed in a closed dark switch, the ambient light intensity of the arc light sensor is close to 0L ux., the indoor natural light intensity is generally about 1000L ux, the rising slope of a triangular wave is assumed to be 1, the brightest peak light intensity is 4000L ux, the triangular wave is continuously sampled, the average light intensity is calculated by adopting trapezoidal integration, the average light intensity is 2000L ux., the threshold value of the average light intensity is far lower than a fault arc signal and far higher than normal ambient light, and 1600L ux-2400L ux is taken as the amplitude range of self-detection light in consideration of measurement errors.
The light intensity data of the detection signal is stored in the light intensity array A [ N ], and the amplitude of the detection signal can be calculated according to the following formula;
in the above formula, AMRepresenting the amplitude of the detected signal, ak]Indicating lightStrength group A [ N ]]The k-th value in (1), N is the light intensity array A [ N ]]The amount of light intensity data in (1). Amplitude A of the detection signalMSatisfies 1600L ux ≦ AM2400 or less 2400L ux, the amplitude of the detection signal is consistent with that of the self-detection light, in this embodiment, the fixed frequency f of the triangular wave is set to 50Hz, when the frequency f of the detection signal is equal to1F is less than or equal to 49.5Hz1When the frequency is less than or equal to 50.5Hz, the frequency of the detection signal is consistent with the frequency of the self-detection light.
The embodiment provides an arc sensor self-checking device based on a triangular wave excitation source, which comprises a microprocessor, wherein the microprocessor is programmed to execute the steps of the arc sensor self-checking method based on the triangular wave excitation source; or a storage medium connected with the microprocessor, stores a computer program programmed to execute the self-test method of the arc sensor based on the triangular wave excitation source.
The present embodiment provides a computer-readable storage medium in which a computer program programmed to execute the aforementioned method for the self-test of the arc sensor based on the triangular wave excitation source is stored.
As shown in fig. 2, the arc sensor self-inspection apparatus includes a self-inspection light emitting unit 1 and a detection light collecting and processing unit 2, the self-inspection light emitting unit 1 includes a triangular wave driving circuit and a light source connected to each other, the detection light collecting and processing unit 2 includes a sampling circuit 21, an AD conversion circuit 22 and a main control unit 23 connected in sequence, an input end of the sampling circuit 21 is connected to an output end of a photosensitive element of a target arc sensor, and an output end of the sampling circuit 21 is connected to the main control unit 23 in sequence through the sampling circuit 21, the AD conversion circuit 22. In this embodiment, the detection light collection and processing unit 2 serves as both the self-detection light signal collection and processing mechanism of the self-detection light emitting unit 1 and the protection mechanism of the arc light protection device where the arc light sensor is located, so that the integration level and the cost can be improved, and the detection light collection and processing unit 2 may also be an independent component of the protection mechanism independent of the arc light protection device.
In this embodiment, the light source is disposed on one side of the photosensor of the target arc sensor, and it is possible to ensure that there is no attenuation in the self-inspection light amplitude between the light source and the photosensor of the target arc sensor.
In this embodiment, the triangular wave driving circuit includes a multivibrator and an integrator circuit, and the multivibrator is connected with a duty ratio adjusting circuit.
As shown in FIG. 3, the multivibrator is implemented by a 555 timer, and the pin 3 is used as the output voltage Vo of the output end and is connected in series with a second capacitor C2And pins No. 6 and No. 7 of the controller are used for adjusting the control voltage of the multivibrator, so that duty ratio adjustment is realized. No. 4 and No. 8 pins of the 555 timer are respectively connected with a power supply Vcc, the No. 1 pin is grounded, and the No. 4 pin is also connected with a first capacitor C1Grounded, the No. 2 pin is connected with a power supply Vc and passes through a third capacitor C3And (4) grounding. The duty ratio regulating circuit is a resistance voltage-dividing regulating circuit formed by connecting a first resistor, a slide rheostat and a second resistor in series, the resistance voltage-dividing regulating circuit is connected between a power supply Vcc and a power supply Vc in series, the first resistor and the regulating terminal of the slide rheostat can be regarded as dividing the slide rheostat into two sub-resistors, and one sub-resistor is connected with the first resistor in series to form a first equivalent resistor R1The other sub-resistor and the second resistor are connected in series to form a first equivalent resistor R2First equivalent resistance R1A first equivalent resistance R2The proportion of the two pins realizes the voltage distribution proportion of No. 6 and No. 7 pins of the 555 timer. As shown in FIG. 3, the integrating circuit is composed of a voltage amplifier, a resistor R3, a resistor R4 and a fourth capacitor C4The voltage Vo is input into the negative input end of the voltage amplifier through the resistor R3, the positive input end of the voltage amplifier is grounded, and the negative input end of the voltage amplifier is connected with the fourth capacitor C4Is connected with the output end of the voltage amplifier, and the output end of the voltage amplifier outputs a voltage V2Output voltage V2I.e., an excitation signal (PWM signal) generated by a triangular wave excitation source for driving the light source to emit light.
The triangular wave driving circuit utilizes a 555 timer to form a multivibrator to generate square waves with adjustable duty ratio,after the square wave is generated, the square wave with adjustable duty ratio is converted into triangular wave with adjustable duty ratio by using an integrating circuit formed by an operational amplifier. See fig. 3, due to diode D2To the third capacitor C on the ground side of the resistance voltage-dividing regulating circuit3Has a charging time constant of τ1＝R1C3Time constant of discharge τ2＝R2C3Wherein R is1Is a first equivalent resistance R1Resistance value of C3Is a third capacitor C3The resistance value of (1); thus, the third capacitance C can be obtained3Charging time T of1＝0.7R1C3Discharge time of T2＝0.7R2C3. Thus, the fixed frequency f of the square wave generated by the 555 timer is:
in the above formula, C3Is a third capacitor C3Resistance value of R1Is a first equivalent resistance R1Resistance value of R2Is a first equivalent resistance R2The resistance value of (2).
The duty ratio q of the square wave generated by the 555 timer is as follows:
in the above formula, T is the period, T1Is a third capacitor C3Charging time of (T)2Is a third capacitor C3Has a discharge time of C3Is a third capacitor C3Resistance value of R1Is a first equivalent resistance R1Resistance value of R2Is a first equivalent resistance R2The resistance value of (2). Therefore, the duty ratio can be changed by only changing the position of the potential sliding end, and when the position of the slide sheet of the slide rheostat in the multivibrator circuit is changed, the duty ratio of the triangular wave is changed.
For L ED lamps, the simplest way to achieve brightness adjustment for L ED is to adjust the forward current flowing through itStream IdThe driving circuit of the present embodiment is designed to satisfy the PWM scheme, and the driving circuit can change the forward current passing through the L ED lamp to change the brightness of the L ED lamp by changing the duty ratio of the triangular wave, the larger the duty ratio of the triangular wave, the stronger the brightness of the L ED lamp, the smaller the duty ratio of the triangular wave, the weaker the brightness of the L ED lamp, generally, the working current of the L ED is generally selected to be about 15mA, when the conversion efficiency of the L ED lamp is higher, and the light attenuation current is reasonable in the present embodiment, the duty ratio q of the triangular wave is selected to be 0.5, and I is set as 0maxMaximum current, I, flowing through L EDd＝ImaxQ is the forward current (operating current) flowing through L ED, at this time, the square wave output by the multivibrator, the triangular wave output by the driving circuit, the current passing through L ED, i.e., PWM waveform, and the average operating current of L ED are shown in sequence as (a), (b), (c), and (d) in FIG. 4, T is the forward pulse duration, T is an operating period, and h is the triangular peak.
The AD conversion performed by the AD conversion circuit 22 is a process of converting an analog voltage or current into a digital quantity proportional thereto. The AD conversion generally includes four processes of sampling, holding, quantizing, and encoding. Some AD converters do not require a holding circuit and quantization and encoding is usually done during the conversion process. Sampling is the process of periodically sampling the analog signal. In order to recover the original analog signal without distortion, the sampling frequency should be no less than twice the highest frequency in the spectrum of the input analog signal. The better the linearity of the sampling circuit 21, the higher the recovery of the sampled waveform to the original analog signal, and vice versa. Therefore, the triangular wave adopted by the embodiment can check the linearity of the sampling element. The quantization is to perform rounding processing on the analog signal according to a quantization unit. The analog input range from zero to the maximum is divided into n values, called quantization steps. While the midpoint value between adjacent quantization steps is called the compare level. Both sampling and quantization of the signal are achieved by the ADC. The quantization process is shown in fig. 5, where t is time, and f (t) is an analog value before quantization and an analog value after quantization, respectively. Encoding is to represent the quantized analog values by binary codes or other encoding to reduce the amount of data.
In the embodiment, a 555 timer and an integrating circuit are utilized to form a triangular wave driving circuit (a triangular wave driven PWM generating circuit), the frequency of a triangular wave emitted by the triangular wave driving circuit is fixed and meets the PWM driving mode of a L ED lamp, namely, the self-detection light flicker frequency emitted by the driving L ED is fixed, the brightness of a lamp light can be modulated to be obviously lower than that of a normal arc light, so that protection misoperation caused by external interference light and other factors is counteracted, the triangular wave driving circuit enables the self-detection light emitted by the L ED to have the characteristic of continuous change of brightness so that the self-detection light has the capability of detecting the linearity of an acquisition element in consideration of continuous change of the amplitude value of the triangular wave, the photosensitive element receives all light signals, a sampling circuit 21 stores and amplifies the light signals captured by the photosensitive element and transmits the amplified light signals to a conversion element to be converted into electric signals, an AD conversion circuit 22 transmits the converted electric signals to a main control unit 23, the main control unit 23 judges the signals that the converted electric signals are consistent with the light signals, the light signals are converted into self-detection signals, the light signals are converted into the signals, the light self-detection signals, the light signals are judged to be the light self-detection signals when the arc light self-detection probe does not have the arc light self-detection failure, the arc light self-detection signals, the arc light self-detection probe can judge that the arc light self-detection probe can not receive the arc light self-detection light is not consistent with the arc light-detection light self-detection light, the arc light-detection light, the arc light-detection light.
In this embodiment, the main control unit 23 is programmed to execute the steps of the arc sensor self-test method based on the triangular wave excitation source; or a storage medium connected with the main control unit 23 stores therein a computer program programmed to execute the aforementioned self-test method of the arc sensor based on the triangular wave excitation source.
The present embodiment also provides an arc protection device with an arc sensor, and the arc protection device further has the aforementioned arc sensor self-inspection apparatus based on a triangular wave excitation source.
In summary, in this embodiment, a triangular wave is used as an excitation signal source, because the amplitude of the triangular wave continuously changes, the main control unit can measure the frequency of the triangular wave, and can also determine the linearity of the photosensitive acquisition loop by measuring the rising or falling slope of the voltage of the triangular wave through AD sampling, so that the "on/off" of the arc light acquisition loop can be determined, and the "linearity" of the arc light measurement loop can be verified.
Example two:
the present embodiment is a subset of the first embodiment, and unlike the systematic solution of the first embodiment, the technical solution of the present embodiment is only the step of performing linearity detection on the photosensitive element of the target arc sensor in the arc sensor self-inspection method based on the triangular wave excitation source of the first embodiment.
The specific implementation steps of the embodiment for detecting the linearity of the photosensitive element of the target arc sensor include that the excitation signal is generated by the triangular wave excitation source to drive the light source to emit self-detection light to the photosensitive element of the target arc sensor, the self-detection light flickers at a fixed frequency f, and the brightness continuously changes according to the continuous change of the amplitude of the excitation signal, the amplitude change rate of the detection signal output by the photosensitive element of the target arc sensor is obtained, whether the amplitude change rate of the excitation signal and the amplitude change rate of the detection signal are consistent or not is judged, if yes, the linearity of the photosensitive element is judged to reach the standard, otherwise, the linearity of the photosensitive element is judged to not reach the standard.
The apparatus of this embodiment is the same as the first embodiment, and also includes the following solutions:
the embodiment provides an arc sensor self-checking device based on a triangular wave excitation source, which comprises a microprocessor, wherein the microprocessor is programmed to execute the steps of the arc sensor self-checking method based on the triangular wave excitation source; or a storage medium connected with the microprocessor, stores a computer program programmed to execute the self-test method of the arc sensor based on the triangular wave excitation source.
The present embodiment provides a computer-readable storage medium in which a computer program programmed to execute the aforementioned method for the self-test of the arc sensor based on the triangular wave excitation source is stored.
The embodiment provides an arc sensor self-checking device based on triangular wave excitation source, include self-checking light luminescence unit 1 and detect light collection processing unit 2, self-checking light luminescence unit 1 includes interconnect's triangular wave drive circuit and light source, and the light source arranges in one side of target arc sensor's photosensitive element, detect light collection processing unit 2 including consecutive sampling circuit 21, AD converting circuit 22 and main control unit 23, sampling circuit 21's input and target arc sensor's photosensitive element's output link to each other, sampling circuit 21's output loops through sampling circuit 21, AD converting circuit 22 and main control unit 23 link to each other. In this embodiment, the triangular wave driving circuit includes a multivibrator and an integrating circuit, and the multivibrator is connected with a duty ratio adjusting circuit. In this embodiment, the main control unit 23 is programmed to execute the steps of the arc sensor self-test method based on the triangular wave excitation source; or a storage medium connected with the main control unit 23 stores therein a computer program programmed to execute the aforementioned self-test method of the arc sensor based on the triangular wave excitation source.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (12)
1. The arc sensor self-checking method based on the triangular wave excitation source is characterized by comprising the following implementation steps:
1) the excitation signal generated by the triangular wave excitation source drives the light source to emit self-detection light to the photosensitive element of the target arc sensor, so that the self-detection light has a fixed frequencyfFlickering and continuously changing the brightness according to the continuous change of the amplitude of the excitation signal;
2) judging whether a detection signal output by a photosensitive element of the target arc sensor is received or not, and if the detection signal is received, skipping to execute the step 3); otherwise, judging the failure of the target arc sensor equipment and quitting;
3) acquiring the amplitude change rate of a detection signal output by a photosensitive element of the target arc sensor, judging whether the amplitude change rate of an excitation signal and the amplitude change rate of the detection signal are consistent, and if so, judging that the linearity of the photosensitive element reaches the standard; otherwise, the linearity of the photosensitive element is judged not to reach the standard.
2. The arc sensor self-testing method based on the triangular wave excitation source of claim 1, wherein the step 3) further comprises a step of comparing the amplitude of the detection signal with a preset threshold, and if the amplitude of the detection signal is larger than the preset threshold, the detection signal output by the photosensitive element of the target arc sensor is judged to be the arc signal, and the target arc sensor can normally receive the arc signal.
3. The arc sensor self-testing method based on the triangular wave excitation source of claim 1, wherein the step 3) further comprises a step of distinguishing a detection signal output from a photosensor of the target arc sensor as self-test light or environmental interference light according to the amplitude and frequency of the detection signal, and if the detection signal output from the photosensor is the self-test light or the environmental interference light, it is determined that the target arc sensor can normally receive the self-test light or the environmental interference light.
4. The arc sensor self-testing method based on the triangular wave excitation source of claim 3, wherein the detailed steps of distinguishing the detection signal output by the photosensitive element of the target arc sensor as self-test light or environmental interference light include: judging whether the amplitude and the frequency of the detection signal and the self-detection light are consistent or not, and if so, judging that the detection signal output by the photosensitive element of the target arc sensor is the self-detection light; otherwise, the detection signal output by the photosensitive element of the target arc sensor is judged to be the environmental interference light.
5. The arc sensor self-testing method based on the triangular wave excitation source of claim 1, wherein the excitation signal generated by the triangular wave excitation source in step 1) is a PWM signal, and the light source driven by the excitation signal is an L ED light source.
6. The arc sensor self-checking method based on the triangular wave excitation source is characterized by comprising the step of detecting the linearity of a photosensitive element of a target arc sensor, and the specific implementation steps comprise: the excitation signal generated by the triangular wave excitation source drives the light source to emit self-detection light to the photosensitive element of the target arc sensor, so that the self-detection light has a fixed frequencyfFlickering and continuously changing the brightness according to the continuous change of the amplitude of the excitation signal; obtaining target arc light transmissionThe rate of change of the amplitude of the detection signal output by the photosensitive element of the sensor; and judging whether the amplitude change rate of the excitation signal and the amplitude change rate of the detection signal are consistent, if so, judging that the linearity of the photosensitive element reaches the standard, otherwise, judging that the linearity of the photosensitive element does not reach the standard.
7. The utility model provides an arc sensor self-checking device based on triangle wave excitation source, includes microprocessor, its characterized in that: the microprocessor is programmed to execute the steps of the triangular wave excitation source based arc light sensor self-checking method of any one of claims 1-6; or a storage medium connected with the microprocessor is stored with a computer program which is programmed to execute the method for the self-checking of the arc sensor based on the triangular wave excitation source in any one of claims 1-6.
8. A computer-readable storage medium characterized by: the computer readable storage medium stores a computer program programmed to execute the method for self-checking of the arc sensor based on the triangular wave excitation source according to any one of claims 1 to 6.
9. An arc light sensor self-checking device based on a triangular wave excitation source comprises a self-checking light emitting unit (1) and a detection light collecting and processing unit (2), the self-checking light emitting unit (1) comprises a triangular wave driving circuit and a light source which are connected with each other, the detection light acquisition and processing unit (2) comprises a sampling circuit (21), an AD conversion circuit (22) and a main control unit (23) which are connected in sequence, the input end of the sampling circuit (21) is used for being connected with the output end of a photosensitive element of the target arc sensor, the output end of the sampling circuit (21) is connected with the main control unit (23) through the sampling circuit (21) and the AD conversion circuit (22) in turn, the main control unit (23) is programmed to execute the steps of the triangular wave excitation source-based arc light sensor self-checking method of any one of claims 1 to 6; or a storage medium connected with the main control unit (23) is stored with a computer program programmed to execute the method for self-checking the arc sensor based on the triangular wave excitation source of any one of claims 1 to 6.
10. The arc sensor self-testing apparatus based on the triangular wave excitation source of claim 9, wherein the light source is disposed on one side of a photosensitive element of the target arc sensor.
11. The arc sensor self-testing device based on the triangular wave excitation source of claim 9, wherein the triangular wave driving circuit comprises a multivibrator and an integrating circuit, and a duty cycle adjusting circuit is connected to the multivibrator.
12. An arc light protection device with an arc light sensor, characterized in that the arc light protection device is further provided with an arc light sensor self-checking device based on a triangular wave excitation source according to any one of claims 9 to 11.
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| EP4113136A1 (en) * | 2021-06-29 | 2023-01-04 | Abb Schweiz Ag | Testing an arc detecting system |
| CN113721117A (en) * | 2021-09-08 | 2021-11-30 | 扬州市银建电气有限公司 | Transformer partial discharge induction withstand voltage test device |
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