CN203773012U - Partial discharging detector based on variable gain amplification - Google Patents
Partial discharging detector based on variable gain amplification Download PDFInfo
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- CN203773012U CN203773012U CN201420134496.7U CN201420134496U CN203773012U CN 203773012 U CN203773012 U CN 203773012U CN 201420134496 U CN201420134496 U CN 201420134496U CN 203773012 U CN203773012 U CN 203773012U
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Abstract
The utility model discloses a partial discharging detector based on variable gain amplification. The partial discharging detector comprises a TEV detection portion and an ultrasonic wave detection portion. The TEV detection portion comprises a TEV sensor, a first signal amplification circuit, a data memory, a data output interface circuit and a display which are successively connected. A comparison circuit which is connected to the data memory is also included. The ultrasonic wave detection portion comprises an ultrasonic wave sensor, a second signal amplification circuit, an ultrasonic wave filter circuit, an audio power amplifier circuit and an earphone plug which are successively connected. The first signal amplification circuit 3 comprises three paths of operation amplifier units with different gains. The three paths of operation amplifier units respectively comprise one UA733 differential amplifier. The TEV sensor inputs signals to signal input terminals of the three UA733 differential amplifiers respectively. The three UA733 differential amplifiers are connected to adjustable resistors, and the amplification gains of the three paths of operation amplifier units with different gains are adjusted to be 10 times, 100 times and 1000 times.
Description
Technical field
The utility model relates to a kind of partial discharge detector amplifying based on variable gain.
Background technology
It is the abbreviation of high-tension electricity Partial Discharge Detection that detection is put in office.As time goes on, high voltage electric equipment can be slowly aging, and insulating property also can decline thereupon, causes its inside may produce partial discharge phenomenon, and this safety to electrical equipment is a very large hidden danger.So in order to eliminate this potential risk, the staff of power plant can make regular check on the situation of equipment, how whether checkout facility there is partial discharge phenomenon and the order of severity.
In order to detect shelf depreciation, a series of electro mechanical parameters that people can produce for shelf depreciation have designed a lot of offices puts testing tool.Partial discharge phenomenon can discharge electricity while occurring severe, and electric charge ionized air can produce ultrasound wave and ozone to a certain degree simultaneously.Accordingly by detect discharge charge number, the size of ultrasonic signal and airborne ozone content judge and have or not shelf depreciation to occur and the order of severity.Before both can measure comparatively easily by electricity instrument, and the latter may need more complicated and professional instrument just can measure, so general, detecting two parameters is above discharge charge and ultrasound wave.
Summary of the invention
Goal of the invention: for above-mentioned prior art, propose a kind of partial discharge detector amplifying based on variable gain, can only just complete discharge charge and hyperacoustic detection of shelf depreciation by an equipment.
Technical scheme: a kind of partial discharge detector, comprises TEV sensor, ultrasonic sensor, first signal amplifying circuit, secondary signal amplifying circuit, ultrasound wave filtering circuit, data-carrier store, comparator circuit, data output interface circuit, display, audio power amplifier circuit, headset plug; Described TEV sensor connects the input end of first signal amplifying circuit, the output terminal of described first signal amplifying circuit connects the input end of comparator circuit, the output terminal connection data storer of described comparator circuit, data output interface circuit is used for connecting described data-carrier store and display; Described ultrasonic sensor connects the input end of secondary signal amplifying circuit, and the output terminal of described secondary signal amplifying circuit connects the input end of ultrasound wave filtering circuit, and the output terminal of described ultrasound wave filtering circuit is by audio power amplifier circuit frames connecting with headphone plug; Described first signal amplifying circuit 3 comprises the amplifier unit of three tunnel different gains, and described three amplifier unit, tunnel comprise respectively a UA733 differential amplifier, and described TEV sensor 1 is input to signal respectively the signal input part of three UA733 differential amplifiers; Described three UA733 differential amplifiers all connect adjustable resistance, and the amplifier unit gain amplifier of adjusting three tunnel different gains is respectively 10 times, 100 times, 1000 times; The output terminal of described three UA733 differential amplifiers is exported the three tunnels different amplifying signal that gains.
As preferred version of the present invention, the ultrasonic sensor that described ultrasonic sensor is 40KHz.
Beneficial effect: TEV sensor is in order to detect the number of discharge charge, TEV sensor is collected TEV signal by capacity coupled mode and is amplified rear and reference value comparison, this fiducial value is stored in data-carrier store, and last TEV signal outputs to display by data output interface and shows.Ultrasonic sensor is to utilize ultrasonic sensor collect ultrasonic signal and amplify, after filtering processes, send to Headphone device after giving the sound signal that conversion adult ear can be identified after audio power amplifier circuit.First signal amplifying circuit is variable-gain amplification circuit, and the bandwidth of the UA733 differential amplifier of choosing is 200MHz, and input impedance is 250 kilo-ohms, can meet office and put the requirement of in detection, different frequency Partial discharge signal being amplified; First signal amplifying circuit adopts the amplifier of three tunnel different gains simultaneously.It is identical that three tunnel amplifier front ends receive signals, and gain difference is respectively 10 times, 100 times, 1000 times, and faint like this signal also can detect, and the large Partial discharge signal of intensity can no to scale yet, can realize well the amplification requirement to varying strength Partial discharge signal.This partial discharge detector is by putting phenomenon to the electric charge of shelf depreciation and the hyperacoustic office can detect more accurately equipment of detecting simultaneously.
Accompanying drawing explanation
Fig. 1 is partial discharge detector structural representation of the present utility model;
Fig. 2 is first signal amplifying circuit schematic diagram in the utility model;
Fig. 3 is secondary signal amplifying circuit schematic diagram in the utility model;
Fig. 4 is ultrasound wave filtering circuit schematic diagram in the utility model;
Fig. 5 is the utility model sound intermediate frequency power amplifier schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is done further and explained.
As shown in Figure 1, a partial discharge detector, comprises TEV sensor 1, ultrasonic sensor 2, first signal amplifying circuit 3, secondary signal amplifying circuit 4, ultrasound wave filtering circuit 6, data-carrier store 7, comparator circuit 8, data output interface circuit 9, display 10, audio power amplifier circuit 11, headset plug 12.TEV sensor 1 connects the input end of first signal amplifying circuit 3, the output terminal of first signal amplifying circuit 3 connects the input end of comparator circuit 8, the output terminal connection data storer 7 of comparator circuit 8, data output interface circuit 9 is for connection data storer 7 and display 10.Ultrasonic sensor 2 connects the input end of secondary signal amplifying circuit 4, and the output terminal of secondary signal amplifying circuit 4 connects the input end of ultrasound wave filtering circuit 6, and the output terminal of ultrasound wave filtering circuit 6 is by audio power amplifier circuit 11 frames connecting with headphone plugs 12.
Wherein, as shown in Figure 2, first signal amplifying circuit 3 is a kind of amplifying circuit of putting charge detection based on office, the amplifier unit that comprises three tunnel different gains, amplifier unit, Gai San road comprises respectively a UA733 differential amplifier, and TEV sensor is input to the signal of acquisition respectively the signal input part of three UA733 differential amplifiers.Three UA733 differential amplifiers all connect adjustable resistance, and the amplifier unit gain amplifier of adjusting three tunnel different gains is respectively 10 times, 100 times, 1000 times; The output terminal of three UA733 differential amplifiers is exported the three tunnels different amplifying signal that gains.The amplifying signal that three tunnels are gained different selects output one road signal to comparator circuit.
In first signal amplifying circuit 3, first via amplifier unit comprises the differential amplifier chip that a model is UA733, office discharges lotus sensor signal by a filter capacitor C75 and does not control after diode D1, through current-limiting resistance R69, be input to the inverting input IN-of amplifier chip, the normal phase input end of amplifier chip, by resistance R 81 ground connection, forms difference input.Between the G1A of UA733 differential amplifier chip and G1B pin, resistance in series R65 and adjustable resistance VR4, adjust the gain of amplifier unit by adjustable resistance, and it is R65+VR4=2K ohm that resistance closes.The second amplifier unit, tunnel and Third Road amplifier unit are all connected with innings electric discharge lotus sensor signal, only be that from the difference of the first via amplifier unit differential amplifier chip connects the resistance of different resistances, it is R71+VR3=200 ohm that the second tunnel amplifier cell resistance resistance is closed, and it is R74+VR5=20 ohm that Third Road amplifier cell resistance resistance is closed; Three UA733 differential amplifiers are by the difference of access adjustable resistance, through the resistance of debugging resistance VR3, VR4, VR5, the amplifier unit of finally realizing three tunnel different gains discharges the office of input after lotus sensor signal is amplified respectively 10 times, 100 times, 1000 times and outputs to follow-up signal treatment circuit.When carrying out circuit debugging, for realizing the requirement of each circuit different gains, first prepare an oscillograph and signal generator, signal generator first arranges original signal strength ratio as 1mV, because the gain of first, second, third amplifier unit, tunnel is respectively 10,100,1000, so adjust the adjustable resistance in each amplifier unit, until detecting three tunnel signal intensities, oscillograph should be respectively 10mV, 100mV, 1000mV, complete the debugging before use.In first signal amplifying circuit 3, other current-limiting resistances are 33 ohm.
As shown in Figure 3, secondary signal amplifying circuit 4 is that a kind of ultrasonic signal detects amplifying circuit, comprises that model is the instrumentation amplifier of INA217AIP, resistance R 46, resistance R 47, adjustable resistance VR1.One end of the positive pole of ultrasonic sensor and resistance R 46 is connected the input signal anode VIN+ of instrumentation amplifier, and one end of the negative pole of ultrasonic sensor and resistance R 47 is connected the input signal negative terminal VIN-of instrumentation amplifier; The other end ground connection of resistance R 46 and resistance R 47, adjustable resistance VR1 is connected between instrumentation amplifier outer meeting resistance pin RG1 and outer meeting resistance pin RG2.Adjustable resistance VR1 resistance is 10 ohm, and resistance R 46 and resistance R 47 are 50 ohm.
Resistance R 46 and resistance R 47 are used for sensor output signal electric current inverted signal voltage, so that amplifier amplifies below.The instrumentation amplifier of the INA217AIP of high by enlargement factor, little on input signal impact, stable output, after the signal of 40KHz ultrasonic sensor output is amplified, output is for subsequent treatment, by adjustable resistance VR1, adjust the enlargement factor of whole circuit to ultrasonic sensor output signal, make the high energy of signal amplify 1000 times.
As shown in Figure 4, ultrasound wave filtering circuit 6 is a kind of ultrasonic testing signals filtering circuits of putting detection based on office, comprises resistance R25, resistance R 26, resistance R 28, capacitor C 35, capacitor C 36, operational amplifier.One end of resistance R 25 connects 40KHz ultrasonic sensor, and the other end of resistance R 25 is connected with one end of resistance R 26, one end of one end of capacitor C 35, capacitor C 36 respectively; The other end ground connection of resistance R 26, the other end of capacitor C 36 is connected with the 3rd one end of resistance R 28 and the inverting input of operational amplifier; The other end of capacitor C 35 is connected with the other end of described resistance R 28 and the output terminal of operational amplifier; The positive input end grounding of operational amplifier, the ultrasonic testing signals after the output terminal output filtering of operational amplifier.
Audio power amplifier circuit as shown in Figure 5, comprises LM486 audio frequency power amplifier chip, resistance R 15, resistance R 16, capacitor C 38, capacitor C 39, capacitor C 40.Wherein, one end of resistance R 15 connects through the filtered ultrasonic signal of ultrasound wave filtering circuit 6, one end of the other end of resistance R 15 while contact resistance R16 and one end of capacitor C 40; The other end of resistance R 16 connects respectively one end of capacitor C 38 and the positive signal input part IN+ of LM486 audio frequency power amplifier chip; The other end ground connection of capacitor C 38, the other end of capacitor C 40 connects the inversion signal input end IN-of LM486 audio frequency power amplifier chip; The output amplifying signal of LM486 audio frequency power amplifier chip is to headset plug 12.Sound signal is after resistance R 15 and R16 dividing potential drop current limliting, after frequency-selecting by appearance C40, the ultrasonic signal of outside 40KHz is generated to difference frequency signal, frequency control is inputted to power amplifier chips LM486 at 2K, by the amplification of power amplifier chips, ultrasonic signal converts the size that allows people's ear can normally listen to sound wave to, outputs to external headphones plug.
TEV sensor 1 partly produces voltage pulse signal for detection of equipment surface metal to be checked, when carrying out TEV measurement, TEV sensor 1 carries out signal with electric signal output by first signal amplifying circuit 3 by the quantity of electric charge of detection by capacity coupled mode and amplifies processing, then by comparator circuit 8, signal and reference value after amplifying are made to difference operation, obtain actual TEV value and be stored in data-carrier store 7, the ground unrest value that this reference value is checkout equipment.Then by data output interface circuit 9, will on the actual TEV value display 10 in data-carrier store 7, show.In addition, during ultrasonic signal by 40KHz ultrasonic sensor 2 checkout equipments, the high-frequency current signal of the certain frequency being obtained by ultrasonic sensor is input to ultrasound wave filtering circuit 6 after secondary signal amplifying circuit 4 amplifies, through filtered ultrasound signal transmission, arrive audio power amplifier circuit, by the differential frequency circuit of 38KHz, the size the output signal that after difference frequency, allow people's ear can normally listen to sound wave frequency control in 2K left and right arrive headset plug.By simultaneously, to the quantity of electric charge and hyperacoustic detection, improve the accuracy of power equipment Partial Discharge Detection.This partial discharge detector have usable range extensively, sensitivity and the advantage such as resolution is high, antijamming capability is strong.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (2)
1. the partial discharge detector amplifying based on variable gain, is characterized in that: comprise TEV sensor (1), ultrasonic sensor (2), first signal amplifying circuit (3), secondary signal amplifying circuit (4), ultrasound wave filtering circuit (6), data-carrier store (7), comparator circuit (8), data output interface circuit (9), display (10), audio power amplifier circuit (11), headset plug (12); Described TEV sensor (1) connects the input end of first signal amplifying circuit (3), the output terminal of described first signal amplifying circuit (3) connects the input end of comparator circuit (8), the output terminal connection data storer (7) of described comparator circuit (8), data output interface circuit (9) is for connecting described data-carrier store (7) and display (10); Described ultrasonic sensor (2) connects the input end of secondary signal amplifying circuit (4), the output terminal of described secondary signal amplifying circuit (4) connects the input end of ultrasound wave filtering circuit (6), and the output terminal of described ultrasound wave filtering circuit (6) is by audio power amplifier circuit (11) frames connecting with headphone plug (12); Wherein, described first signal amplifying circuit (3) comprises the amplifier unit of three tunnel different gains, described three amplifier unit, tunnel comprise respectively a UA733 differential amplifier, and described TEV sensor (1) is input to signal respectively the signal input part of three UA733 differential amplifiers; Described three UA733 differential amplifiers all connect adjustable resistance, and the amplifier unit gain amplifier of adjusting three tunnel different gains is respectively 10 times, 100 times, 1000 times; The output terminal of described three UA733 differential amplifiers is exported the three tunnels different amplifying signal that gains.
2. a kind of partial discharge detector amplifying based on variable gain according to claim 1, is characterized in that: the ultrasonic sensor that described ultrasonic sensor is 40KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420134496.7U CN203773012U (en) | 2014-03-24 | 2014-03-24 | Partial discharging detector based on variable gain amplification |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420134496.7U CN203773012U (en) | 2014-03-24 | 2014-03-24 | Partial discharging detector based on variable gain amplification |
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| CN203773012U true CN203773012U (en) | 2014-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420134496.7U Expired - Fee Related CN203773012U (en) | 2014-03-24 | 2014-03-24 | Partial discharging detector based on variable gain amplification |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004798A (en) * | 2015-06-30 | 2015-10-28 | 中南大学 | Intelligent signal amplification apparatus and method for foundation piles ultrasonic testing equipment |
| CN106093730A (en) * | 2016-07-27 | 2016-11-09 | 杭州柯林电气股份有限公司 | Intelligence type local-discharge ultrasonic wave sensor and method of work thereof |
| CN112674798A (en) * | 2021-02-01 | 2021-04-20 | 青岛海信医疗设备股份有限公司 | Ultrasonic device, ultrasonic image processing method and medium |
-
2014
- 2014-03-24 CN CN201420134496.7U patent/CN203773012U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004798A (en) * | 2015-06-30 | 2015-10-28 | 中南大学 | Intelligent signal amplification apparatus and method for foundation piles ultrasonic testing equipment |
| CN105004798B (en) * | 2015-06-30 | 2017-10-27 | 中南大学 | A kind of signal intelligent amplifying device and method for foundation pile ultrasonic detecting equipment |
| CN106093730A (en) * | 2016-07-27 | 2016-11-09 | 杭州柯林电气股份有限公司 | Intelligence type local-discharge ultrasonic wave sensor and method of work thereof |
| CN106093730B (en) * | 2016-07-27 | 2019-04-26 | 杭州柯林电气股份有限公司 | Intelligent type local-discharge ultrasonic wave sensor and its working method |
| CN112674798A (en) * | 2021-02-01 | 2021-04-20 | 青岛海信医疗设备股份有限公司 | Ultrasonic device, ultrasonic image processing method and medium |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Corning road in Jiangning District of Nanjing City, Jiangsu province 211100 Dongshan Street Industrial Zone No. 789 Patentee after: SANTAI ELECTRIC POWER TECHNOLOGY (NANJING) CO.,LTD. Address before: Corning road in Jiangning District of Nanjing City, Jiangsu province 211100 Dongshan Street Industrial Zone No. 789 Patentee before: SUNTECH ELECTRIC (NANJING) CO.,LTD. |
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| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 |
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| CF01 | Termination of patent right due to non-payment of annual fee |