KR101549844B1 - System for monitoring arc and diagonosing overheat of distribution board by detecting infrared/ultraviolet and method thereof - Google Patents

Abstract

The present invention relates to an arc monitoring degradation diagnostic system comprising: a sapphire window; a first optical filter for filtering and outputting infrared rays with the wavelength of 1-5 μm which enters through the sapphire window; a second optical filter for filtering and outputting light with the wavelength of 4.35 μm which enters through the sapphire window; an infrared ray sensor for detecting light with the wavelength of 4.4-5.0 μm output from the first optical filter, and light with the wavelength of 4.35 μm output from the second optical filter; an amplifier for outputting an amplification signal by amplifying the light detected from the infrared ray sensor; a band-pass filter for band-passing and outputting a flicker frequency signal of 5-20 Hz among amplification signals output from the amplifier; an ultraviolet light detection sensor for detecting ultraviolet rays; a pulse generation module for generating discharge pulse by the ultraviolet rays detected from the ultraviolet light detection sensor; a digital signal process module for outputting a digital signal by receiving the discharge pulse generated by the pulse generation module; and an arc generation determination module for outputting a non-arc signal when a digital signal is output from the digital signal process module and the flicker frequency signal of 5-20 Hz is output from the band-pass filter, and for outputting an arc signal when a digital signal is output from the digital signal process module and the flicker frequency signal of 5-20 Hz is not output from the band-pass filter.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc monitoring deterioration diagnosis system and method for an A /

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc monitoring deterioration diagnosis system and method, and more particularly, to an arc deterioration diagnosis system and method of an arc panel by IR / UV (infrared / ultraviolet) detection.

An arc detector of the switchboard is configured to cause an alarm when an arc is detected to prevent a fire or an accident in advance.

However, other factors besides the arc can also cause an alarm, such as sunlight, artificial light, and hot body radiation. Other factors other than these arcs cause a detection error of the arc detector.

The characteristics of the spectrum of solar radiation, artificial light, hot body, and arc generation can be shown in FIG.

1 is a graph showing a spectrum distribution by energy source.

Referring to FIG. 1, the relative intensity of the radiant energy of each radiant energy source wavelength band is shown. At this time, it is found that the infrared intense radiation has the strongest intrinsic wavelength of 1.0 탆 to 5.0 탆.

This phenomenon is greatly different from the spectral distribution of the relative intensity of infrared rays emitted from the sunlight or the high temperature object shown in Fig.

Such characteristics can be an important point for filtering non-arc alarm factors such as natural light by sunlight, artificial light such as an infrared heater or a halogen lamp which emits heat at a high temperature.

In an actual power distribution panel, carbon dioxide gas is released when an arc occurs due to a contact failure, a short circuit, or a short circuit, and resonance radiation occurs in an intermediate region of 4.4 μm to 5.0 μm. This is the same as the spectroscopic characteristic unique to carbon dioxide gas generated by the heat of the carbon dioxide gas generated by the arc generated combustion heat of the object.

Referring again to FIG. 1, it can be seen that the infrared rays in the wavelength range having the maximum radial intensity coincide with the radiation radiated by the high temperature carbon dioxide gas during arc generation.

However, the signal of such a wavelength band is also generated by the flame. In the case of a flame, the infrared ray has a flicker frequency characteristic due to flame blinking.

Conventional arc detectors indirectly detect arcs mainly through ultraviolet rays of a specific wavelength band, but there is a high possibility of malfunction due to influence of external light due to ultraviolet rays caused by sunlight and illumination. In this way, it is not detected by using the carbon emission caused by arc, short circuit, or the like. The emission of carbon molecules and the spectroscopic characteristics of the resulting carbon molecules are influenced by the contact failure, short circuit, Because it is directly related to the accident, it is very encouraging in that it can directly detect dangerous arc accidents.

Particularly, since the arc is generated many times in a very short time and disappears, there arises a problem that an arc alarm is generated even when it is not directly related to an accident such as a contact failure or a short circuit.

The infrared rays emitted by the flame or the sunlight always fluctuate in the amount of emitted infrared rays, and the fluctuation frequency is concentrated in the flicker frequency range of 5 to 20 [Hz].

Therefore, by filtering the infrared signal of this frequency band, it is possible to detect the non-arc signal for the flame. However, conventional arc detectors have never had the capability of detecting non-arc signals for such flames. Therefore, non-arc components such as disturbance light, flame, etc. of sunlight other than the arc generated in the switchboard can not be removed, and non-arc alarms frequently occur.

Korean Registered Patent No. 1127094 (March 23, 2012)

SUMMARY OF THE INVENTION An object of the present invention is to provide an arc monitoring deterioration diagnosis system for an electric distribution panel by IR / UV detection.

It is another object of the present invention to provide a method for diagnosing an arc monitoring deterioration of an A / D board by IR / UV detection.

According to an aspect of the present invention, there is provided an arc monitoring deterioration diagnosis system for an A / V panel by IR / UV detection, comprising: a sapphire window; A first optical filter for filtering and outputting infrared rays having a wavelength of 1 탆 to 5 탆 through the sapphire window; A second optical filter for filtering and outputting light having a wavelength of 4.35 mu m incident through the sapphire window; An infrared sensor for detecting light having a wavelength of 4.4 탆 to 5.0 탆 outputted from the first optical filter and light having a wavelength of 4.35 탆 outputted from the second optical filter; An amplifier for amplifying the light detected by the infrared sensor and outputting an amplified signal; A band pass filter for band-passting a flicker frequency signal of 5 Hz to 20 Hz out of amplified signals output from the amplifier; An ultraviolet ray detection sensor for detecting ultraviolet rays; A pulse generation module for generating a discharge pulse according to the ultraviolet ray sensed by the ultraviolet ray sensor; A digital signal processing module receiving the discharge pulse generated by the pulse generation module and outputting a digital signal; And outputs a non-arc signal when a digital signal is output from the digital signal processing module and a flicker frequency signal of 5 Hz to 20 Hz is output from the band pass filter. And outputting an arc signal when a flicker frequency signal of 5 Hz to 20 Hz is not output from the band pass filter.

Here, the alarm output module may further include an alarm output module for outputting an alarm when the arc occurrence determination module determines that an arc has occurred.

The ultraviolet sensor is configured to pass ultraviolet rays generated by the arc having a wavelength band of 180 nm to 280 nm to be input to the ultraviolet ray sensor and to have a wavelength band of 280 nm to 400 nm And an ultraviolet ray filter configured to block the ultraviolet rays from being input to the ultraviolet ray detection sensor.

The pulse generating module includes: an arc signal shaping circuit for shaping and outputting the generated discharge pulse; An arc signal counting unit counting the number of discharge pulses converted by the arc signal shaping circuit unit every predetermined cycle; And a data latch section for storing the number of discharge pulses counted in the arc signal counting section.

The pulse generation module may further include a pulse width conversion circuit unit for converting the pulse width of the discharge pulse converted by the arc signal shaping circuit unit to a constant value and outputting the pulse width to the digital signal processing module.

Another object of the present invention is to provide an arc monitoring deterioration diagnosis method for an arc panel by IR / UV detection, wherein a first optical filter has a wavelength of 4.4 탆 to 5.0 탆, which is incident through a sapphire window, Filtering and outputting the infrared light of 4.35 mu m through the second optical filter through the sapphire window; An apparatus according to claim 1, wherein an infrared sensor Detecting light having a wavelength of 4.4 탆 to 5.0 탆 and light having a wavelength of 4.35 탆 outputted from the second optical filter and detecting ultraviolet rays by the ultraviolet sensor; A band pass filter outputs a flicker frequency signal of 5 Hz to 20 Hz in the band of the light detected by the infrared sensor and outputs the pulse signal to the pulse generating module in the ultraviolet ray detected by the ultraviolet ray sensor Generating a discharge pulse and outputting a digital signal by receiving a discharge pulse generated by the pulse generation module; The arc generation determination module outputs a non-arc signal when a digital signal is output from the digital signal processing module and a flicker frequency signal of 5 Hz to 20 Hz is output from the band pass filter, And outputting an arc signal when a digital signal is output from the signal processing module and a flicker frequency signal of 5 Hz to 20 Hz is not output from the band pass filter.

In this case, when the arc generation determination module determines that an arc has occurred, the alarm output module may output an alarm.

The infrared sensor detects the light having a wavelength of 4.4 탆 to 5.0 탆 outputted from the first optical filter and the light having the wavelength of 4.35 탆 outputted from the second optical filter by an ultraviolet filter, The step of detecting the ultraviolet rays by the detection sensor comprises passing the ultraviolet rays generated by the arc having a wavelength band of 180 nm to 280 nm and inputting the ultraviolet rays to the ultraviolet ray sensor, The ultraviolet ray having a wavelength band is cut off and can not be inputted to the ultraviolet ray detection sensor.

The band pass filter band-pass filters a 5 Hz to 20 Hz flicker frequency signal among the lights detected by the infrared sensor, and when the pulse generating module detects the ultraviolet Wherein the step of generating the discharge pulse according to the ultraviolet light and the digital signal processing module receiving the discharge pulse generated by the pulse generation module and outputting the digital signal is characterized in that the arc signal shaping circuit part shapes and outputs the generated discharge pulse, The arc signal count section counts the number of discharge pulses converted by the arc signal shaping circuit section every predetermined cycle and the data latch section stores the number of discharge pulses counted by the arc signal count section.

The band pass filter band-pass filters a 5 Hz to 20 Hz flicker frequency signal among the lights detected by the infrared sensor, and when the pulse generating module detects the ultraviolet Wherein the step of generating a discharge pulse according to ultraviolet light and the digital signal processing module receiving a discharge pulse generated by the pulse generation module and outputting a digital signal includes the steps of: The pulse width may be constantly converted and output to the digital signal processing module.

According to the arc monitoring deterioration diagnosis system and method of the switchboard according to the IR / UV detection described above, infrared rays generated by carbonization, especially those having flicker frequency characteristics due to the flame, are classified into vacancies, There is an effect of reducing and improving non-arc alarm caused by light or flame.

In addition, since the arc signal is double-detected by the ultraviolet signal, the arc detection probability is remarkably increased.

1 is a graph showing a spectrum distribution by energy source.
2 is a block diagram of an arc monitoring deterioration diagnosis system of an A / V panel by IR / UV detection according to an embodiment of the present invention.
3 is a block diagram of an electric distribution panel to which an arc monitoring deterioration diagnosis system according to an embodiment of the present invention is applied.
4 is a block diagram of a pulse generating module according to an embodiment of the present invention.
5 is a circuit diagram of an ultraviolet ray sensor according to an embodiment of the present invention.
6 is a circuit diagram of an ultraviolet ray sensor according to an embodiment of the present invention.
7A to 7C are circuit diagrams of a control CPU and an alarm relay according to an embodiment of the present invention.
8 is a flowchart of an arc monitoring deterioration diagnosis method of an electric distribution panel by IR / UV detection according to an embodiment of the present invention.
9 is a flowchart of an arc monitoring deterioration diagnosis algorithm of an A / V panel by IR / UV detection according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail to the concrete inventive concept. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of an arc monitoring deterioration diagnosis system for an A / V panel by IR / UV detection according to an exemplary embodiment of the present invention. FIG. 3 is a block diagram of an arc monitor deterioration diagnosis system according to an embodiment of the present invention. FIG.

2 and 3, an arc monitoring deterioration diagnosis system (hereinafter, referred to as an 'arc monitoring deterioration diagnosis system') 100 (hereinafter, referred to as 'an arc inspection deterioration diagnosis system') by IR / UV (infrared / ultraviolet) Includes a sapphire window 101, a first optical filter 102, a second optical filter 103, an infrared sensor 104, an amplifier 105, a band pass filter a band pass filter 106, an ultraviolet ray sensor 107, a pulse generation module 108, a digital signal processing module 109, an arc generation determination module 110 and an alarm output module 111 have.

The arc monitoring deterioration diagnosis system 100 simultaneously uses infrared detection and ultraviolet ray detection for arc monitoring. That is, the arc monitoring deterioration diagnosis system 100 can be divided into two blocks, an infrared ray detection block A and an ultraviolet ray detection block B.

In order to reduce erroneous operation due to non-arc detection, the arc monitoring deterioration diagnosis system 100 is configured to classify a signal having a flicker frequency into an arc among infrared rays by carbonization to reduce non-arc false alarms.

The flicker frequency is the frequency at which the amount of infrared radiation is increased or decreased by flame flickering.

The arc monitoring deterioration diagnosis system 100 is configured to output an arc signal when the flicker frequency is not detected and ultraviolet light is detected, thereby accurately detecting the arc.

Hereinafter, the detailed configuration will be described.

First, the infrared ray detection block (A) will be described.

The sapphire window 101 is provided at the front end of the first optical filter 102 and the second optical filter 103 as an infrared ray incident structure.

The first optical filter 102 filters and outputs infrared rays having a wavelength of 4.4 탆 to 5.0 탆 through the sapphire window 101 and the second optical filter 103 outputs infrared light having a wavelength of 4.35 And outputting the filtered light having a wavelength of [mu] m.

Carbon spectroscopic characteristics are mainly observed at wavelengths of 4.4 ㎛ to 5.0 ㎛, and especially at wavelengths of 4.35 ㎛.

The infrared sensor 104 can be configured to detect the light of the wavelength of 4.4 탆 to 5.0 탆 m output from the first optical filter 102 and the light of the wavelength of 4.35 탆 outputted from the second optical filter 103 . That is, infrared rays having carbon spectroscopic characteristics are separately detected.

The amplifier 105 may be configured to amplify the light detected by the infrared sensor 104 and output an amplified signal.

The band pass filter 105 band-pass the 5 Hz to 20 Hz flicker frequency signal among the amplified signals output from the amplifier. Such a flicker frequency signal is not a frequency signal due to an arc but mainly has a frequency signal characteristic due to extraneous light such as a flame or sunlight, so that the frequency signal is detected and classified as a non-arc signal.

Next, the ultraviolet ray detection block B will be described.

The ultraviolet ray detection sensor 106 may be configured to detect ultraviolet rays.

Here, the ultraviolet ray sensor 106 is configured to pass ultraviolet rays generated by an arc having a wavelength band of 180 nm to 280 nm, to be input to the ultraviolet ray sensor 106, and to emit ultraviolet rays having wavelengths of 280 nm to 400 nm And an ultraviolet filter configured to block ultraviolet rays having a band and not to be input to the ultraviolet ray detection sensor.

Accordingly, natural light or illumination light is filtered and filtered to reduce arc false alarm caused by natural light.

The pulse generation module 107 may be configured to generate a discharge pulse according to the detected ultraviolet ray when the ultraviolet ray sensor 106 detects the ultraviolet ray.

The digital signal processing module 108 may be configured to receive a discharge pulse generated by the pulse generation module 107 and output a digital signal.

Next, the arc occurrence determination module 110 is configured to determine whether or not an arc is generated by using the results detected by the infrared ray detection block A and the ultraviolet ray detection block B, respectively.

The arc occurrence determination module 110 first determines whether a digital signal is output from the digital signal processing module 109. At this time, when a digital signal is output, it is determined whether a band-pass filter 105 outputs a flicker frequency signal of 5 Hz to 20 Hz.

At this time, when the ultraviolet ray is detected and the flicker frequency is also detected, the arc occurrence determination module 110 is configured to output a non-arc signal by determining the infrared ray emission by the flame rather than the arc.

The arc occurrence determination module 110 is configured to output an arc signal when it is determined that an arc has occurred when the base ultraviolet ray is detected but the flicker frequency is not detected.

The alarm output module 111 may be configured to output an alarm when the arc occurrence determination module 110 determines that an arc has occurred.

4 is a block diagram of a pulse generating module according to an embodiment of the present invention.

2B, the pulse generating module 120 according to an embodiment of the present invention includes an arc signal shaping circuit unit 121, an arc signal counting unit 122, a data latch unit 123, a pulse width conversion circuit unit 124 ). ≪ / RTI >

Referring to FIG. 2B, the arc signal shaping circuit 108a may be configured to form and output a discharge pulse generated by the ultraviolet ray sensor 107. FIG.

The arc signal shaping circuit part 108a can be configured to clipped or form a signal having a predetermined magnitude or more and output it because the discharge pulse itself is an analog signal, which is distorted or irregular.

The arc signal counting unit 108b may be configured to count the number of discharge pulses converted by the arc signal shaping circuit unit 121 every predetermined period.

The data latch unit 108c may be configured to store the number of discharge pulses counted by the arc signal count unit 108b.

The data latch unit 108c is a memory structure for determining how often arcs occur every predetermined cycle. The alarm output module 111 may be configured to determine whether or not an alarm is generated by using the number of discharge pulses stored in the data latch unit 108c.

The pulse width conversion circuit portion 108d may be configured to convert the pulse width of the discharge pulse converted by the arc signal shaping circuit portion 108a to a constant value and output it to the digital signal processing module 109. [

The digital signal processing module 109 is configured to receive the pulse widths of the discharge pulses of the arc signal shaping circuit portion 108a in a constantly processed state in order to generate various arc generation information by analyzing the discharge pulses.

5 is a circuit diagram of an ultraviolet ray sensor according to an embodiment of the present invention.

Referring to FIG. 5, a circuit using an ultraviolet photodiode (UV sensor) among the ultraviolet ray sensor 107 is shown.

Here, the ultraviolet photodiode is configured to convert ultraviolet light into a small current proportional to the amount thereof, and a photocurrent given to a specific active chip area can be calculated by the following equation (1).

Where lp is the photocurrent, Achip is the active chip area, Schip is the spectral sensitivity of the chip, and E? Is the spectral irradiance of the UV light source.

An ultraviolet photodiode generates a small current and generally produces a current of the order of a few nA proportional to the intensity of the ultraviolet light.

The circuit of Fig. 5 is a circuit configuration of a trans-impedance amplifier, which is used to convert such a small current to an appropriate voltage, which is controlled by an analog-to-digital converter (ADC) of a microcontroller .

The operational amplifier converts the current generated by the ultraviolet photodiode to a predetermined voltage according to the resistance Rf, and the output voltage thereof is the value of the following equation (2).

6 is a circuit diagram of an ultraviolet ray sensor according to an embodiment of the present invention.

6 shows a circuit that can actually be operated by inputting values of passive elements in a circuit provided with an ultraviolet photodiode.

Referring to FIG. 6, an ultraviolet photodiode called GUVA-C22SD is used. GUVA-C22SD carries a current of 26 nA / UV index, with Rf of 8.2 MΩ Cf being 10 pF.

As a result, the output voltage Vout is 852.8 mV by 26 nA * 4 * 8.2 according to the detection amount of ultraviolet rays, so the ultraviolet photodiode GUVA-C22SD senses 4 index ultraviolet rays.

On the other hand, since there is no ideal operational amplifier, the operational amplifier adds a DC offset to its own output value.

The output Vout of the operational amplifier can be expressed by the following equation (3).

As a result, it is desirable to configure the operational amplifier to have a minimum input voltage offset Vio. The operational amplifier OA1MPA of FIG. 6 is desirable because it provides Vio of up to 200 V. Considering Vio, Vout is 26 nA * 4 * 8.2 MΩ ± 200 V and Vout is 853.6 V at 853 mV, which is 234 ppm Error.

로 정의되며, 여기서, K는 볼츠만 상수(Boltzmann’s constant)이고, T는 온도(K)이다.The operational amplifier OA1MPA of FIG. 6 provides a maximum offset voltage Vio of 200 kV and is therefore being adopted as a preferred device. Though somewhat paradoxical, the larger the value of the feedback resistor Rf, the better the signal-to-noise ratio (SNR). The noise of the resistor is thermal noise, and the thermal noise en_Rf is

, Where K is Boltzmann's constant and T is temperature (K).

The total output current Vout can be expressed by the following equation (4).

6, Vout becomes 26 nA * 4 * 8.2 MΩ ± 200 V ± 10 pA * 8.2 MΩ, and the range of Vout becomes 852.5 mV to 853.1 mV. Here, an error of 330 ppm can be generated, which is comparable to the theoretical value of 234 ppm.

7A to 7C are circuit diagrams of a control CPU and an alarm relay according to an embodiment of the present invention.

7A shows a control unit of the arc generation judgment module 110. [

The pins of the control unit are as follows.

PA0-PA3 is the output of the channel-specific alarm output module 170, -PA4-PA7 is the SLAVE ID INPUT of the interface device, PB1 is the ISP_SCK, -PB5-PB7 is the alarm lamp output, PD2 is the RXD INPUT, PE2 is RS-485 SERIAL INPUT / OUTPUT, PE4-PE7 is SENSOR CONTROL SIGNAL OUTPUT, PF2 is COM LED, and PF4-PF7 is JTAG.

7B shows an alarm output module 111, that is, a relay operation unit.

The operation of the alarm output module 111 is performed by analyzing the data received from the infrared sensor 104 on the monitor. Relay outputs NC, C, NO contacts. Use REDx when an alarm occurs.

7C shows the operation of the alarm lamp.

The alarm lamp uses 2-color lamps and is displayed in green, yellow and red. GRN is green lamp on, GRN + RED is on yellow lamp, RED red lamp is on.

8 is a flowchart of an arc monitoring deterioration diagnosis method of an electric distribution panel by IR / UV detection according to an embodiment of the present invention.

Referring to FIG. 8, in step S101, a first optical filter 102 filters and outputs infrared rays having a wavelength of 4.4 탆 to 5.0 탆 through a sapphire window 101, And the second optical filter 103 filters and outputs light having a wavelength of 4.35 mu m which is incident through the sapphire window 101. [

Next, in step S102, the infrared sensor 104 converts the light having the wavelength of 4.4 mu m to 5.0 mu m output from the first optical filter 102 and the light having the wavelength of 4.35 mu m output from the second optical filter 103 As shown in FIG.

On the other hand, the ultraviolet ray sensor 107 detects the ultraviolet ray separately from the infrared ray sensor 104.

At this time, the ultraviolet ray detection sensor 107 transmits ultraviolet rays generated by an arc having a wavelength band of 180 to 280 nm by the ultraviolet ray filter and is inputted to the ultraviolet ray detection sensor 107, The ultraviolet ray detection sensor 107 may be configured to block ultraviolet rays having a wavelength band of 400 nm to 400 nm and not be input to the ultraviolet ray detection sensor 107.

Next, in step S103, a band pass filter 106 band-pass a flicker frequency signal of 5 Hz to 20 Hz in the light detected by the infrared sensor 104.

Separately, the pulse generation module 108 generates a discharge pulse in accordance with the ultraviolet ray sensed by the ultraviolet ray sensor 107, and the digital signal processing module 109 inputs a discharge pulse generated by the pulse generation module 108 And outputs a digital signal.

At this time, the arc signal shaping circuit part 108a shapes and outputs the generated discharge pulse, the arc signal counting part 108b counts the number of discharge pulses converted by the arc signal shaping circuit part 108b every predetermined cycle, And the latch portion 108c may be configured to store the number of discharge pulses counted in the arc signal count portion 108b.

And the pulse width conversion circuit unit 108d may convert the pulse width of the discharge pulse converted by the arc signal shaping circuit unit 108a to a constant value and output it to the digital signal processing module 109

Next, in step S104, when the arc generation determination module 110 outputs a digital signal in the digital signal processing module 109 and a flicker frequency signal of 5 Hz to 20 Hz in the band pass filter, -arc) signal.

When the digital signal processing module 109 outputs a digital signal and the band pass filter 105 outputs a flicker frequency signal of 5 Hz to 20 Hz, the arc occurrence determination module 110 outputs an arc signal .

Next, in step S105, when it is determined that an arc has occurred in the arc occurrence determination module 110, the alarm output module 111 outputs an alarm.

9 is a flowchart of an arc monitoring deterioration diagnosis algorithm of an A / V panel by IR / UV detection according to an embodiment of the present invention.

First, the determination of the occurrence of an arc may be configured to quantize the frequency signal and convert it into 1024 level signals to determine the arc. The signal of the infrared sensor 130 normally exists at the 800-900 level. Therefore, at a level below 1024 level, the lower the level, the more the response to the flower garden.

As shown in FIG. 9, the arc determination module 110 may be configured to convert a frequency signal of 20 Hz to 1000 Hz band-pass filtered by the band-pass filter 106 into a digital signal of level 0 to level 1023.

If the digital signal is lower than or equal to the user-specified reference value A1 level or higher than the A2 level, the arc determination module 110 may determine that the arc determination module 110 determines that the difference between the A1 level and the A1 level And A2 level may be configured to determine that an arc has occurred when the deviation is repeated every 2 seconds with a difference of at least a certain value B1.

The arc determination module 110 repeatedly repeats the difference value between the digital signal of the A1 level or lower and the A1 level or the difference value of the A2 level or more of the A2 level and the A2 level consecutively four times or more every 5 seconds It is determined that an arc has occurred.

More specifically, the infrared sensor signal is converted into a quantized level through the ADC of the microcontroller. In the case where the level is 1024 or less based on the normal level, the value obtained by subtracting the level from the A1 level is stored in the temporary buffer. The value obtained by subtracting A2 from the level is stored in the temporary buffer.

Since the infrared sensor signal is shaken between the levels A1 to A2 set by the user as the reference value and the level lower than 1024 is responding to the arc source as the level is lowered, the value of 1024 or more is substituted for the maximum value, Buffer. If the value of the temporary buffer is larger than the value of the buffer storing the maximum value, the value becomes the maximum value. This process is repeated every time the infrared sensor signal is sampled.

In this process, a negative number (-) can be output. The buffer storing the maximum value of the level is initialized to 0 in the program, so that the level between the arbitrary values x1 and x2 is 0. When this process is repeated, when the maximum value of the level is 2 or more, the arc flag occurs. If the arc flag is 4 consecutive times, the arc is recognized.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims. There will be.

101: Sapphire window
102: first optical filter
103: second optical filter
104: Infrared sensor
105: Amplifier
106: Bandpass filter
107: Ultraviolet sensor
108: Pulse generation module
109: Digital signal processing module
110: an arc occurrence determination module
111: Alarm output module

Claims (10)

Sapphire window;
A first optical filter for filtering and outputting infrared rays having a wavelength of 4.4 탆 to 5.0 탆 through the sapphire window;
A second optical filter for filtering and outputting light having a wavelength of 4.35 mu m incident through the sapphire window;
An infrared sensor for detecting light having a wavelength of 4.4 탆 to 5.0 탆 outputted from the first optical filter and light having a wavelength of 4.35 탆 outputted from the second optical filter;
An amplifier for amplifying the light detected by the infrared sensor and outputting an amplified signal;
A band pass filter for band-passting a flicker frequency signal of 5 Hz to 20 Hz out of amplified signals output from the amplifier;
An ultraviolet ray detection sensor for detecting ultraviolet rays;
A pulse generation module for generating a discharge pulse according to the ultraviolet ray sensed by the ultraviolet ray sensor;
A digital signal processing module receiving the discharge pulse generated by the pulse generation module and outputting a digital signal;
And outputs a non-arc signal when a digital signal is output from the digital signal processing module and a flicker frequency signal of 5 Hz to 20 Hz is output from the band pass filter. (Infrared / ultraviolet) detection module that includes an arc generation determination module that outputs an arc signal when a signal of a frequency of 5 Hz to 20 Hz is not output from the band-pass filter, Arc monitoring deterioration diagnosis system for switchboards.
The method according to claim 1,
Further comprising an alarm output module for outputting an alarm if an arc is generated in the arc occurrence determination module.
The ultraviolet ray sensor according to claim 1,
The ultraviolet rays generated by the arc having a wavelength band of 180 nm to 280 nm are transmitted through the ultraviolet ray sensor and blocked by ultraviolet rays having a wavelength band of 280 nm to 400 nm by natural light or illumination light, And an ultraviolet ray filter configured to be prevented from being input to the detection sensor.
The apparatus of claim 3, wherein the pulse generation module comprises:
An arc signal shaping circuit for shaping and outputting the generated discharge pulse;
An arc signal counting unit counting the number of discharge pulses converted by the arc signal shaping circuit unit every predetermined cycle;
And a data latch unit for storing the number of discharge pulses counted by the arc signal counting unit.
The apparatus of claim 4, wherein the pulse generation module comprises:
Further comprising a pulse width conversion circuit part for converting the pulse width of the discharge pulse converted by the arc signal shaping circuit part into a constant pulse width and outputting the pulse width to the digital signal processing module. Deterioration diagnostic system.
A first optical filter filters and outputs an infrared ray having a wavelength of 4.4 탆 to 5.0 탆 through a sapphire window and outputs the filtered infrared light having a wavelength of 4.35 탆 through the sapphire window, And outputting the filtered light;
An infrared sensor detects light having a wavelength of 4.4 탆 to 5.0 탆 outputted from the first optical filter and light having a wavelength of 4.35 탆 outputted from the second optical filter, and the ultraviolet sensor detects ultraviolet ;
A band pass filter band-pass filters a 5 Hz to 20 Hz flicker frequency signal in the light detected by the infrared sensor, and the pulse generating module outputs the flicker frequency signal according to the ultraviolet ray detected by the ultraviolet ray sensor Generating a discharge pulse and a digital signal processing module receiving a discharge pulse generated by the pulse generation module and outputting a digital signal;
The arc generation determination module outputs a non-arc signal when a digital signal is output from the digital signal processing module and a flicker frequency signal of 5 Hz to 20 Hz is output from the band pass filter, An infrared / ultraviolet (IR) / ultraviolet (IR / UV) signal including a digital signal output from the signal processing module and an arc signal if the band-pass filter does not output a flicker frequency signal of 5 Hz to 20 Hz; Method for diagnosing arc monitoring deterioration of switchboard by detection.
The method according to claim 6,
Further comprising the step of the alarm output module outputting an alarm if the arc occurrence determination module determines that an arc has occurred, wherein the alarm output module outputs an alarm.
7. The apparatus according to claim 6, wherein the infrared sensor detects light having a wavelength of 4.4 mu m to 5.0 mu m outputted from the first optical filter and light having a wavelength of 4.35 mu m outputted from the second optical filter, The ultraviolet ray detecting sensor detects the ultraviolet ray,
The ultraviolet rays generated by the arc having a wavelength band of 180 nm to 280 nm are passed through the ultraviolet ray filter to be input to the ultraviolet ray detecting sensor and the ultraviolet ray having a wavelength band of 280 nm to 400 nm Wherein the ultraviolet ray detecting sensor is configured to block the ultraviolet ray from entering the ultraviolet ray detecting sensor.
7. The apparatus of claim 6, wherein the bandpass filter bandpasses a flicker frequency signal of 5 Hz to 20 Hz in the light detected by the infrared sensor, Generating a discharge pulse according to the ultraviolet ray sensed by the sensor and receiving a discharge pulse generated by the pulse generation module and outputting the digital signal,
The arc signal shaping circuit part formats and outputs the generated discharge pulse, and the arc signal count part counts the number of discharge pulses converted by the arc signal shaping circuit part every predetermined cycle. When the data latch part counts Wherein the controller is configured to store the number of discharge pulses.
[11] The apparatus of claim 9, wherein the band pass filter bandpasses a flicker frequency signal of 5 Hz to 20 Hz out of the light detected by the infrared sensor, Generating a discharge pulse according to the ultraviolet ray sensed by the sensor and receiving a discharge pulse generated by the pulse generation module and outputting the digital signal,
Wherein the pulse width conversion circuit part converts the pulse width of the discharge pulse converted by the arc signal shaping circuit part into a constant pulse width and outputs the converted pulse width to the digital signal processing module. .

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