CN101813730A - Device for detecting power equipment discharge based on ultraviolet method - Google Patents
Device for detecting power equipment discharge based on ultraviolet method Download PDFInfo
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- CN101813730A CN101813730A CN 201010151604 CN201010151604A CN101813730A CN 101813730 A CN101813730 A CN 101813730A CN 201010151604 CN201010151604 CN 201010151604 CN 201010151604 A CN201010151604 A CN 201010151604A CN 101813730 A CN101813730 A CN 101813730A
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Abstract
The invention discloses a device for detecting power equipment discharge based on an ultraviolet method, comprising a sensor unit, a signal processing unit, a processor unit and a power supply unit, wherein the sensor unit comprises a front-end light-filtering device and a photomultiplier which are correspondingly arranged; the signal processing unit comprises a front-end amplifying circuit, a wave-filtering adjustment circuit, a post amplifying circuit, a pulse discriminating circuit and a digital integrating circuit; the power supply unit comprises a high-voltage power supply module and a circuit power supply module; the high-voltage power supply module is connected with the power end of the photomultiplier; and the circuit power supply module is connected with the related power ends of the signal processing unit and the processor unit. The device not only can qualitatively analyze the discharge condition, but also can quantitatively detect the discharge capacity of the equipment, is convenient for the operators to understand the discharge trend of the equipment and simultaneously provides the basis for evaluating the insulation state of the operating equipment. The device adopts non-contact measurement, thereby greatly improving the security of power detection.
Description
Technical field
The present invention relates to the power equipment discharge detection range, particularly a kind of device for detecting power equipment discharge based on ultraviolet method.
Background technology
Detect the high-tension apparatus discharge and can effectively understand apparatus insulated state,,, and provide the foundation of science for power department operation, maintenance so the research of high-tension apparatus discharge examination has important academic significance for fault detect provides reliable reference data.The shelf depreciation of checkout equipment is insulation status to be made the main means of assessment, and the means of present online detection shelf depreciation mainly contain the infrared imaging method, pulse current method, ultrasonic method and ultrahigh frequency method etc.These detection methods all have advantage separately aspect different, have also all obtained application to a certain degree in practice, but also all have problem separately simultaneously.Pulse current method sensitivity, to detect frequency low and antijamming capability is also poor; Ultrasonic attenuation is suitable for closely detecting than very fast; The ultrahigh frequency method is in location and unfavorable detection aspect anti-interference two.
The high-tension apparatus discharge can give off ultraviolet light, assesses the situation of discharge by detecting the ultraviolet light intensity, is a kind of new method that detects the high-tension apparatus discharge.Because the ultraviolet signal of discharge generation does not need directly to contact with operational outfit when detecting, but carries out under separated by a distance with equipment, ultraviolet detection can accomplish not have a power failure, do not influence system running state, and its antijamming capability is also stronger.
The ultraviolet detection technology of corona discharge has its original advantage, range of application is also very wide, but at present the instrument ultraviolet imagery instrument of primary commercialization can not get large-area application because it much costs an arm and a leg, only limits to imaging function and can not get accurate numerical value, can't work long hours and the not high weak point of absolute sensitivity.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of device for detecting power equipment discharge based on ultraviolet method, can carry out the Radiant UV Power of generation in the digital integration quantitative measurment discharge by high-speed sampling again, the quantitative response strength of discharge, can be used as the foundation of judging that discharge is strong and weak, simultaneously, can also detect the ultraviolet pulse number of extremely faint discharge.This system sensitivity height, the linearity is good, can be applied to the discharge examination of high voltage electric power equip ment.
Device for detecting power equipment discharge based on ultraviolet method of the present invention comprises sensor unit, signal processing unit, processor unit and power supply unit;
Described sensor unit comprises corresponding front end filtering apparatus and the photomultiplier that is provided with;
Described signal processing unit comprises pre-amplification circuit, filtering adjustment circuit, rearmounted amplifying circuit, pulse discriminator circuit and digital integrating circuit, the signal input part of described pre-amplification circuit and the signal output part of photomultiplier link, the signal output part of described pre-amplification circuit is connected to the pulse discriminator circuit respectively and circuit is adjusted in filtering, the direct impulse that described pulse discriminator circuit is exported pre-amplification circuit exports processor unit to after comparing and screening and count; After the amplifying signal that described filtering adjustment circuit is exported pre-amplification circuit carries out filtering and adjusts processing, export rearmounted amplifying circuit to, the signal output part and the digital integrating circuit of described rearmounted amplifying circuit link, and the signal output part and the processor unit of described digital integrating circuit link;
Described power supply unit comprises high voltage supply module and circuit supply module, and the power end of described high voltage supply module and photomultiplier links, and described circuit supply module links with the power end of signal processing unit and processor unit respectively.
Further, described pre-amplification circuit comprises first operational amplifier and first adjustable resistance, and the reverse input end of described operational amplifier links through the signal output part of first resistance and photomultiplier, and its positive input is through second resistance eutral grounding; One end of described first adjustable resistance and the positive input of first operational amplifier link, and the output terminal of its adjustable end and operational amplifier links, and the positive and negative power end of described first operational amplifier is respectively through first electric capacity and second capacity earth;
Further, described filtering is adjusted circuit and is comprised second operational amplifier, the reverse input end of described second operational amplifier links by the 3rd electric capacity of connection according to this and the amplification output terminal of the 4th electric capacity and pre-amplification circuit, described the 3rd electric capacity connects the output terminal that second operational amplifier is inserted in the back with the common junction of the 4th electric capacity with the 3rd resistance, the output terminal of the positive input of described second arithmetic device and second operational amplifier links, and the positive and negative power end of described second operational amplifier is respectively through the 5th electric capacity and the 6th capacity earth;
Further, described rearmounted amplifying circuit comprises the 3rd operational amplifier, the reverse input end of described the 3rd operational amplifier links through the output terminal of the 4th resistance and second operational amplifier, the common junction of the reverse input end of described the 3rd operational amplifier and the 4th resistance links through the output terminal of the 5th resistance and the 3rd operational amplifier, the positive input of described the 3rd operational amplifier is through the 6th resistance eutral grounding, described second operational amplifier just, negative power end is respectively through the 8th electric capacity and the 9th capacity earth, and the output terminal of the 3rd operational amplifier and the signal input part of digital integrating circuit link;
Further, described pulse discriminator circuit comprises first comparer and second comparer, described first comparer and second comparer all adopt MAX902, wherein, the reverse input end of the positive input of described first comparer and second comparer links, the output terminal of both common junction and potential quality amplifying circuit links, the adjustable end of the reverse input end of described first comparer and second adjustable resistance links, one end external power supply of described second adjustable resistance, other end ground connection, the adjustable end of the positive input of described second comparer and the 3rd adjustable resistance links, an end external power supply of described the 3rd adjustable resistance, other end ground connection;
The 7th pin of described first comparer connects the external driving power in back with the 7th pin of second comparer, the 3rd pin of described first comparer connects back ground connection with the 3rd pin of second comparer, the tenth pin of described first comparer and the 14 pin connect the external driving power in back, the tenth pin of described second comparer and the 14 pin connect after the 7th capacity earth, and the common port of described first comparer the tenth pin and the 14 pin and the common port of second comparer the tenth pin and the 14 pin link;
The positive pole of the output terminal of described first comparer and first diode links, the negative pole of described first diode inserts the first input end with door, the positive pole of the output terminal of described second comparer and second diode links, the negative pole of described second diode inserts second input end with door, describedly links with the output terminal of door and the Interrupt Process pin of processor unit;
Further, it is the circuit framework of core that described digital integrating circuit adopts with the digital integration chip, the input end of analog signal of described digital integration chip and the signal output part of pre-amplification circuit link, and the digital signal input end mouth of the digital signal output end of described digital integrating circuit and processor unit links;
Further, described processor unit comprises single-chip microcomputer and peripheral circuit thereof, also is connected with outer extension memory and LCDs on the described single-chip microcomputer;
Further, described single-chip microcomputer is C8051F120, and described outer extension memory is IS51C512AH;
Further, described circuit supply module comprises mimic channel power supply submodule, digital circuit power supply submodule, liquid crystal display power supply submodule and high-voltage power supply power supply submodule;
Described mimic channel power supply submodule comprises that voltage is accumulator and the external charge device of 6V, the output terminal of described accumulator obtains 5V output by connecting with the TPS76850 chip, the output terminal of described accumulator obtains by linking with three terminal regulator LM317 chip+2.5V output, and the output terminal of described accumulator obtains by linking with three terminal regulator LM337 chip-2.5V output;
Described digital circuit power supply submodule links by the 5V output terminal of AS1117 chip and mimic channel power supply submodule, obtains+3.3V output;
Described liquid crystal display power supply submodule links by the 5V output terminal of DC-DC inversion chip MAX765 and mimic channel power supply submodule, obtains-12V output;
Described high-voltage power supply power supply submodule links by the 5V output terminal of DC-DC inversion chip MAX761 and mimic channel power supply submodule, obtains-12V output.
The invention has the beneficial effects as follows:
1. the present invention adopts non-contact measurement, has improved the security that electric power detects greatly, and it is easy and simple to handle, has reduced workload for operating personnel simultaneously; This product can be installed in the scene, realizes long-time round-the-clock monitoring, realizes not having a power failure detection, has unique advantage with a lot of instrumentation ratios;
2. the present invention has adopted high-performance day blind area ultravioplet photomultiplier, and has made microwave dark room, and the high-performance optical filtering technique, has taked effective measures to reduce and has disturbed, and system's antijamming capability is strong;
3. device of the present invention can not only the qualitative analysis discharge scenario can also detection by quantitative equipment discharge capacity, be convenient to the discharge trend that the operations staff understands equipment, the assessment foundation of operational outfit state of insulation also is provided simultaneously;
4. this installation cost is cheap, compares with the ultraviolet imagery instrument to have price advantage, is fit to apply.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can obtain instruction from the practice of the present invention to investigating hereinafter.Target of the present invention and other advantages can realize and obtain by following instructions and claims.
Description of drawings
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, wherein:
Fig. 1 is the hardware configuration connection diagram;
Fig. 2 is the circuit connection diagram of pre-amplification circuit;
Fig. 3 adjusts the circuit connection diagram of circuit and rearmounted amplifying circuit for filtering;
Fig. 4 is the circuit connection diagram of pulse discriminator circuit;
Fig. 5 is the pin connection layout of digital integration chip;
Fig. 6 is the pin synoptic diagram of single-chip microcomputer C8051F120;
Fig. 7 is the pin connection layout of outer extension memory chip I S61C512AH;
Fig. 8 is the interface circuit figure of LCD MODULE;
Fig. 9 is each module converts connection diagram of power supply unit;
Figure 10 is the circuit connection diagram of mimic channel power supply submodule;
Figure 11 is the circuit connection diagram of digital circuit power supply submodule;
Figure 12 is the circuit connection diagram of liquid crystal display power supply submodule;
Figure 13 is the circuit connection diagram of high-voltage power supply power supply submodule;
Figure 14 is the circuit connection diagram of high-voltage power supply CC-183Y;
Figure 15 is a principle of device structural representation of the present invention;
Figure 16 is software workflow figure of the present invention.
Embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.Should be appreciated that preferred embodiment only for the present invention is described, rather than in order to limit protection scope of the present invention.
As shown in Figure 1, the device for detecting power equipment discharge based on ultraviolet method of the present invention comprises sensor unit 1, signal processing unit 2, processor unit 3 and power supply unit 4;
Detection principle of the present invention is as follows: the sensor that adopts energy linear reflection incident intensity and waveform, the light that enters the sensor sensitive surface is gathered, obtain the instant output waveform of this part light, and instant waveform is carried out analog to digital conversion and digital integration handle and obtain digitized average power, just Fang Dian average energy.This parameter is the integral mean to the true waveform of UV radiation on the one hand, can characterize the power of discharge in the unit interval; The UV radiation waveform that the corona discharge that can reduce on the other hand produces is for the UV radiation of studying corona discharge provides reference.Its acquisition will provide of great value reference for high pressure on-line monitoring and operation maintenance.
PMT (photomultiplier) is a kind of being based upon on photoelectron emissions effect, secondary and the electron optics theoretical foundation, faint incident light is converted to photoelectron and obtain the important vacuum photoemissive device of multiplication.Have high sensitivity and ultrafast time response.Typical photomultiplier comprises the device of photo-emissive cathode (photocathode) and focusing electrode, dynode and electron collector (anode).Because adopted the Secondary Emission dynode system, photomultiplier can detect ultraviolet, as seen and in the photoelectric detector of the emittance of near-infrared region have high sensitivity and extremely low noise.In addition, photomultiplier also has characteristics such as response fast, low background, large area cathode.
Dark current be photomultiplier under the situation that has not a particle of illumination fully, under the operating voltage of regulation, record the output current of anode.Cause by thermionic emission, interelectrode leakageg stream, the emission of ions of managing interior residual gas, field emission, inner fluorescent tube etc.Dark current is the minimum luminous flux (i.e. the limiting snesibility of this pipe) that the decision photomultiplier can be measured.Therefore, the present invention has taked corresponding measure to reduce dark current, obtains higher sensitivity, improves the precision of instrument.Concrete measure is to adopt to keep the base cleaning, and means such as shroud reliable ground are controlled temperature as far as possible, and radome should leave pipe glass shell 1mm～2mm at least, and the physical dimension of system is increased, and reduces the parasitic effects of electrostatic screening.
Overall architecture of the present invention be by ultraviolet light after filtration photosystem shine the PMT photocathode, make PMT output electric signal, the laggard horizontal pulse of amplification filtering is handled and the digital integration processing by setting to compare respectively to screen, the result is presented on the LCDs; Wherein, power module is to sensor unit and signal processing unit, the circuit supply of processor unit.
As shown in Figure 2, pre-amplification circuit 21 comprises the first operational amplifier U1 and the first adjustable resistance RT1, the reverse input end of the first operational amplifier U1 links through the signal output part of first resistance R 1 with photomultiplier 12, and its positive input is through second resistance R, 2 ground connection; The end of the first adjustable resistance RT1 and the positive input of the first operational amplifier U1 link, the output terminal of its adjustable end and the first operational amplifier U1 links, and the positive and negative power end of the first operational amplifier U1 is respectively through first capacitor C 1 and second capacitor C, 2 ground connection.
As shown in Figure 3, filtering is adjusted circuit 22 and is comprised the second operational amplifier U2, the reverse input end of the second operational amplifier U2 links by the 3rd capacitor C 3 of connection according to this and the amplification output terminal of the 4th capacitor C 4 and pre-amplification circuit 21, the 3rd capacitor C 3 connects the output terminal that the second operational amplifier U2 is inserted in the back with the common junction of the 4th capacitor C 4 with the 3rd resistance R 3, the output terminal of the positive input of the second operational amplifier U2 and the second operational amplifier U2 links, and the second operational amplifier U2 just, negative power end is respectively through the 5th capacitor C 5 and the 6th capacitor C 6 ground connection.
As shown in Figure 4, pulse discriminator circuit 24 comprises the first comparer M1 and the second comparer M2, the first comparer M1 and the second comparer M2 all adopt MAX902, wherein, the reverse input end of the positive input of the first comparer M1 and the second comparer M2 links, the output terminal of both common junction and pre-amplification circuit links, the adjustable end of the reverse input end of the first comparer M1 and the second adjustable resistance RT2 links, the end external power supply of the second adjustable resistance RT2, other end ground connection, the adjustable end of the positive input of the second comparer M2 and the 3rd adjustable resistance RT3 links, the end external power supply of the 3rd adjustable resistance RT3, other end ground connection;
The 7th pin of the first comparer M1 connects the external driving power in back with the 7th pin of the second comparer M2, the 3rd pin of the first comparer M1 connects back ground connection with the 3rd pin of the second comparer M2, the tenth pin of the first comparer M1 and the 14 pin connect the external driving power in back, the tenth pin of the second comparer M2 and the 14 pin connect after the 7th capacitor C 7 ground connection, and the common port of the first comparer M1 the tenth pin and the 14 pin and the common port of the second comparer M2 the tenth pin and the 14 pin link;
The positive pole of the output terminal of the first comparer M1 and the first diode D1 links, the negative pole of the first diode D1 inserts the first input end with door M3, the positive pole of the output terminal of the second comparer M2 and the second diode D2 links, the negative pole of the second diode D2 inserts second input end with door M3, links with the output terminal of door M3 and the Interrupt Process pin of processor unit 3.
This circuit adopts the high-speed comparator of two high bandwidths, and ultraviolet pulse and two threshold ratios up and down of presetting are screened out effective discharge signal, by changing high level pulse into goalkeeper's useful signal, sends into processor and counts processing again.Vmin and Vmax are two threshold values, according to logical relation, have only the amplitude of satisfying greater than Vmin, could export high level less than the voltage pulse signal of Vmax, and the power frequency that is lower than Vmin is disturbed, and power supply disturbs and the random disturbance that is higher than Vmax will be excluded.Can adjust according to these two threshold values of actual conditions.The high level letter of circuit output is counted by single-chip microcomputer paired pulses number, and the highest count frequency is 100MHz.
As shown in Figure 5, in the present embodiment, it is the circuit framework of core that digital integrating circuit 25 adopts with digital integration chip AD7825, the input end of analog signal of digital integration chip and the signal output part of pre-amplification circuit link, and the digital signal input end mouth of the digital signal output end of digital integrating circuit 25 and processor unit 3 links.
Owing to carried out high-speed sampling, the C8051F120 internal storage can not meet the demands, and use outer extension memory.The outer extension memory chip that adopts is IS61C512AH, 512K capacity, high-speed low-power-consumption.Circuit connection diagram as shown in Figure 7.
As shown in Figure 8, LCD MODULE adopts built-in KS0107 controller YXD-12864A-02 graph lcd module, and display screen carries backlight.This display system also has RS232 serial ports output, four buttons and hummer etc.The output of RS232 serial ports is used for that the value that digital integration obtains is sent to computing machine and stores.Four buttons are used for instrument is operated, and comprise the time of setting step-by-step counting or integration, switch between two kinds of metering systems.
Power-supply system of the present invention is a very important ingredient, as shown in Figure 9, among the present invention, power supply unit 4 comprises high voltage supply module 41 and circuit supply module 42, high voltage supply module 41 links with the power end of photomultiplier 12, and circuit supply module 42 links with the power end of signal processing unit 2 and processor unit 3 respectively.
Circuit supply module 42 comprises mimic channel power supply submodule 421, digital circuit power supply submodule 422, liquid crystal display power supply submodule 423 and high-voltage power supply power supply submodule 424.
As shown in figure 10, mimic channel power supply submodule 421 comprises that voltage is accumulator and the external charge device of 6V, and the output terminal of accumulator obtains 5V output by connecting with the TPS76850 chip;
The output terminal of accumulator obtains by linking with three terminal regulator LM317 chip+2.5V output, and the output terminal of accumulator obtains by linking with three terminal regulator LM337 chip-2.5V output; Be used to offer the operational amplifier use of pre-amplification circuit and rearmounted amplifying circuit;
As shown in figure 11, digital circuit power supply submodule 422 links by the 5V output terminal of AS1117 chip and mimic channel power supply submodule, obtains+3.3V output, is used for the single-chip microcomputer power supply;
As shown in figure 12, liquid crystal display power supply submodule 423 links with the 5V output terminal of mimic channel power supply submodule by DC-DC inversion chip MAX765, obtains-12V exports, and is used for the contrast of regulator solution crystal display screen;
As shown in figure 13, high-voltage power supply power supply submodule 424 links by the 5V output terminal of DC-DC inversion chip MAX761 and mimic channel power supply submodule, obtains+12V output, provides input voltage to high-voltage power module.
In addition, photomultiplier needs high voltage drive work, in the present embodiment, adopts the 850V negative high voltage as its driving voltage.High voltage supply module 41 adopts the high-voltage power supply CC-183Y of shore pine company, and the schematic diagram of CC-183Y as shown in figure 14.Be characterized in integrated height, volume is little, compact conformation, and input power supply accommodation is wide, output voltage is adjustable continuously, and it is reliable and stable that high pressure is adjusted mode, is particularly suitable for the field, portable, dry cell power supplies etc. generally are used for miniature instrument, and what CC-183Y exported is negative high voltage.
Adjustment by potentiometer can make output be stabilized in the 850V negative high voltage, and each dynode interstage voltage is 85V behind voltage divider.High-voltage power supply high-voltage output end ripple is about 350mV, is carrying out the filtering circuit processing with the low pressure input end, has suppressed power supply ripple numerical value and has been about 40mV, and noise/ripple value is 0.00365%, has reached very low level.
High-tension electromagnetic radiation meeting impacts the ultraviolet electronic signal.So need use metallic shield ground connection, thereby solve signal interference problem effectively to high-voltage power module.
Figure 15 is a principle of device structural representation of the present invention, as shown in the figure, after the ultraviolet light process camera lens light path of discharge equipment radiation, disturb by the most of bias lights of uv filter filtering again, enter sensor, sensor amplifies weak one according to self response characteristic, the output photocurrent, circuit processing and amplifying after testing at last shows at last and transmits.
Figure 16 is software workflow figure of the present invention, after discharging detection device of the present invention powers on, integration constant and step-by-step counting time and threshold value are set on guidance panel, select mode of operation again, the luminous power pattern is just carried out the high-speed AD sampling and is carried out digital integration in this way, the pulse work pattern then starts timer to be counted the pulse that meets the requirements, and shows testing result at last.
1. ultraviolet pulse method (UV Pulse Method)
Characteristics according to discharge, the ultraviolet light of radiation is similar to the current pulse signal of pulse current method during discharge, be inconvenient to differentiate its amplitude sometimes, the pulsed current signal of sensor output, after conversion and amplifying, compare with preset threshold value, obtain the number of pulse, judge the intensity of discharge by the dense degree of pulse number.
2. uv power method (UV Optical Power Method)
Adopt the method for measuring its power to reach detection all discharge signal, become uv power method (UV Optical Power Method) at this to discharge.The uv power method requires sensor that signal is had linear response curve, the situation of reaction discharge that can be strictly according to the facts.Its device numerical relation is derived as follows:
Photoelectric effect first law is thought, certain or light source spectrum distribution one timing when light source frequency, saturation photocurrent I
bWith the luminous flux P of negative electrode strict proportional relation is arranged: P ∝ I
b
Intensity be the pointolite of steady state value in distance for r, area is that the luminous flux on the photocathode of S (is worked as r
2During the photocathode dimension) be
And photocathode area S fixes, and has so
In the normal direction of ultraviolet source, distance is for the r place, perpendicular to the uv radiation intensity H on the bin of this normal
AAvailable formula (3.29) expression:
Wherein, H
AIt is uv radiation intensity; H
λIt is spectral irradiance apart from light source normal direction r place; S
λIt is the spectrum sensitivity of UV power meter detector; τ
λIt is the dried spectral transmission factor of penetrating optical filter of detector.According to the half width method, can calculate H
AValue, unit is W/cm2.
Actual measurement is at the uv radiation intensity H of needs by measurement certain hour t
A, again this value is carried out integration and obtain discharge energy again divided by time T, obtain average power
:
The present invention is directed to the relative merits of two kinds of methods, comprehensively use two kinds of methods, under the extremely faint situation of some signals, use the ultraviolet pulse method, sacrifice precision to reach higher sensitivity, under the stronger situation of signal, adopt the uv power method, obtain higher precision.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of the technical program, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (9)
1. based on the device for detecting power equipment discharge of ultraviolet method, it is characterized in that: described device comprises sensor unit (1), signal processing unit (2), processor unit (3) and power supply unit (4);
Described sensor unit (1) comprises corresponding front end filtering apparatus (11) and the photomultiplier (12) that is provided with;
Described signal processing unit (2) comprises pre-amplification circuit (21), circuit (22) is adjusted in filtering, rearmounted amplifying circuit (23), pulse discriminator circuit (24) and digital integrating circuit (25), the signal output part of the signal input part of described pre-amplification circuit (21) and photomultiplier (12) links, the signal output part of described pre-amplification circuit (21) is connected to pulse discriminator circuit (24) respectively and circuit (22) is adjusted in filtering, the direct impulse that described pulse discriminator circuit (24) is exported pre-amplification circuit (21) exports processor unit (3) to after comparing and screening and count; After the amplifying signal that described filtering adjustment circuit (22) is exported pre-amplification circuit (21) carries out filtering and adjusts processing, export rearmounted amplifying circuit (23) to, the signal output part of described rearmounted amplifying circuit (23) and digital integrating circuit (25) link, and the signal output part of described digital integrating circuit (25) and processor unit (3) link;
Described power supply unit (4) comprises high voltage supply module (41) and circuit supply module (42), the power end of described high voltage supply module (41) and photomultiplier (12) links, and described circuit supply module (42) links with the power end of signal processing unit (2) and processor unit (3) respectively.
2. the device for detecting power equipment discharge based on ultraviolet method according to claim 1, it is characterized in that: described pre-amplification circuit (21) comprises first operational amplifier (U1) and first adjustable resistance (RT1), the reverse input end of described first operational amplifier (U1) links through the signal output part of first resistance (R1) with photomultiplier (12), and its positive input is through second resistance (R2) ground connection; The positive input of one end of described first adjustable resistance (RT1) and first operational amplifier (U1) links, the output terminal of its adjustable end and first operational amplifier (U1) links, and the positive and negative power end of described first operational amplifier (U1) is respectively through first electric capacity (C1) and second electric capacity (C2) ground connection.
3. the device for detecting power equipment discharge based on ultraviolet method according to claim 1 and 2, it is characterized in that: described filtering is adjusted circuit (22) and is comprised second operational amplifier (U2), the reverse input end of described second operational amplifier (U2) links by the 3rd electric capacity (C3) of connection according to this and the amplification output terminal of the 4th electric capacity (C4) and pre-amplification circuit (21), described the 3rd electric capacity (C3) connects the output terminal that second operational amplifier (U2) is inserted in the back with the common junction of the 4th electric capacity (C4) with the 3rd resistance (R3), the output terminal of the positive input of described second operational amplifier (U2) and second operational amplifier (U2) links, and described second operational amplifier (U2) just, negative power end is respectively through the 5th electric capacity (C5) and the 6th electric capacity (C6) ground connection.
4. the device for detecting power equipment discharge based on ultraviolet method according to claim 3, it is characterized in that: described rearmounted amplifying circuit (23) comprises the 3rd operational amplifier (U3), the reverse input end of described the 3rd operational amplifier (U3) links through the output terminal of the 4th resistance (R4) with second operational amplifier (U2), the common junction of the reverse input end of described the 3rd operational amplifier (U3) and the 4th resistance (R4) links through the output terminal of the 5th resistance (R5) with the 3rd operational amplifier (U3), the positive input of described the 3rd operational amplifier (U3) is through the 6th resistance (R6) ground connection, described second operational amplifier (U3) just, through the 8th electric capacity (C8) and the 9th electric capacity (C9) ground connection, the signal input part of the output terminal of the 3rd operational amplifier (U3) and digital integrating circuit (25) links negative power end respectively.
5. the device for detecting power equipment discharge based on ultraviolet method according to claim 4, it is characterized in that: described pulse discriminator circuit (24) comprises first comparer (M1) and second comparer (M2), described first comparer (M1) and second comparer (M2) all adopt MAX902, wherein, the reverse input end of the positive input of described first comparer (M1) and second comparer (M2) links, the output terminal of both common junction and pre-amplification circuit links, the adjustable end of the reverse input end of described first comparer (M1) and second adjustable resistance (RT2) links, one end external power supply of described second adjustable resistance (RT2), other end ground connection, the adjustable end of the positive input of described second comparer (M2) and the 3rd adjustable resistance (RT3) links, one end external power supply of described the 3rd adjustable resistance (RT3), other end ground connection;
The 7th pin of described first comparer (M1) connects the external driving power in back with the 7th pin of second comparer (M2), the 3rd pin of described first comparer (M1) connects back ground connection with the 3rd pin of second comparer (M2), the tenth pin of described first comparer (M1) and the 14 pin connect the external driving power in back, the tenth pin of described second comparer (M2) and the 14 pin connect after the 7th electric capacity (C7) ground connection, and the common port of described first comparer (M1) the tenth pin and the 14 pin and the common port of second comparer (M2) the tenth pin and the 14 pin link;
The positive pole of the output terminal of described first comparer (M1) and first diode (D1) links, the negative pole of described first diode (D1) inserts the first input end with door (M3), the positive pole of the output terminal of described second comparer (M2) and second diode (D2) links, the negative pole of described second diode (D2) inserts second input end with door (M3), describedly links with the output terminal of door (M3) and the Interrupt Process pin of processor unit (3).
6. the device for detecting power equipment discharge based on ultraviolet method according to claim 5, it is characterized in that: it is the circuit framework of core that described digital integrating circuit (25) adopts with the digital integration chip, the input end of analog signal of described digital integration chip and the signal output part of pre-amplification circuit link, and the digital signal input end mouth of the digital signal output end of described digital integrating circuit (25) and processor unit (3) links.
7. the device for detecting power equipment discharge based on ultraviolet method according to claim 1, it is characterized in that: described processor unit (3) comprises single-chip microcomputer (31) and peripheral circuit thereof, also is connected with outer extension memory (32) and LCD MODULE (33) on the described single-chip microcomputer.
8. the device for detecting power equipment discharge based on ultraviolet method according to claim 7 is characterized in that: described single-chip microcomputer is C8051F120, and described outer extension memory is IS51C512AH.
9. the device for detecting power equipment discharge based on ultraviolet method according to claim 1, it is characterized in that: described circuit supply module (42) comprises that voltage is accumulator and the external charge device of 6V, also comprises mimic channel power supply submodule (421), digital circuit power supply submodule (422), liquid crystal display power supply submodule (423) and high-voltage power supply power supply submodule (424);
Described mimic channel power supply submodule (421) connects with the output terminal of accumulator by the TPS76850 chip and obtains 5V and export, and the 5V output terminal obtains by linking with three terminal regulator LM317 chip+and 2.5V exports;
Described digital circuit power supply submodule (422) links by the 5V output terminal of AS1117 chip and mimic channel power supply submodule, obtains+3.3V output;
Described liquid crystal display power supply submodule (423) links with the 5V output terminal of mimic channel power supply submodule by DC-DC inversion chip MAX765, obtain-12V output+12V output terminal obtains by linking with three terminal regulator LM337 chip-2.5V exports;
Described high-voltage power supply power supply submodule (424) links by the 5V output terminal of DC-DC inversion chip MAX761 and mimic channel power supply submodule, obtains+12V output.
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| CN 201010151604 CN101813730A (en) | 2010-04-20 | 2010-04-20 | Device for detecting power equipment discharge based on ultraviolet method |
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Application publication date: 20100825 |