CN104913829A - Single crystal silicon piezoresistive type online oil level detector - Google Patents
Single crystal silicon piezoresistive type online oil level detector Download PDFInfo
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- CN104913829A CN104913829A CN201510395574.8A CN201510395574A CN104913829A CN 104913829 A CN104913829 A CN 104913829A CN 201510395574 A CN201510395574 A CN 201510395574A CN 104913829 A CN104913829 A CN 104913829A
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Abstract
The invention relates to a single crystal silicon piezoresistive type online oil level detector, which comprises a measuring circuit, a signal processing circuit and a display which are orderly connected, wherein the measuring circuit is a bridge measurement circuit which comprises four single crystal silicon piezoresistive type sensors and a power supply, the single crystal silicon piezoresistive type sensors are arranged on an oil drain valve position which is arranged on the bottom portion of an oil tank of a converter transformer to obtain pressure signals of the oil drain valve position, and the height of oil level is obtained through the signal processing circuit by magnifying, compensating temperature, converting modules and converting scales. Compared with the prior art, the single crystal silicon piezoresistive type online oil level detector has the advantages of rapid and accurate detection, simple structure, strong reliability, low cost and convenient installation and the like.
Description
Technical field
The present invention relates to a kind of oil level detection instrument, especially relate to the online oil level detection instrument of a kind of monocrystalline silicon piezoresistance formula.
Background technology
Direct-current ultra high voltage, EHV transmission engineering are widely used in China, and DC transmission engineering transmission capacity is large, and distance, has excellent adjusting function, are the gordian techniquies realizing the interconnected and energy source pathway of bulk power grid.Converter power transformer is one of DC transmission engineering nucleus equipment, for converter provides stable commutation power supply, vital effect is played to the stability of direct current transportation, converter power transformer generally adopts single-phase double winding pattern, conventional+-500kV current conversion station design needs 12, +/-800kV ultra-high voltage converter station is then up to 24, separate unit change of current varying capacity reaches 297.5MVA (ex:TCH146DR/ABB), insulating medium adopts oil-insulation, separate unit oil mass reaches 106800L, converter power transformer running environment is complicated, short-circuit impedance is large, bear alterating and direct current compressive stress simultaneously, existing characteristics harmonic wave and uncharacteristic harmonics electric current in operation.The change of current becomes oil level and monitors general employing mechanical type oil level indicator, is installed on conservator side, by converting terminal box, oil level signal is uploaded to monitoring backstage, pulpit in addition.Change of current And of Varying Depth reaches about 6 meters, in addition due to height barrier, comparatively difficult for oil level indicator position detection in actual motion, and meanwhile, the oil level signal that backstage is uploaded may cause error in data due to secondary circuit failure, correctly cannot monitor that the change of current becomes oil level.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and provide a kind of monocrystalline silicon piezoresistance formula online oil level detection instrument, there is the advantages such as express delivery accurately detects, structure is simple, reliability is strong, cost is low, easy for installation.
Object of the present invention can be achieved through the following technical solutions:
The online oil level detection instrument of a kind of monocrystalline silicon piezoresistance formula comprises the metering circuit, signal processing circuit and the display that connect successively, described metering circuit is the bridge measuring circuit by four monocrystalline silicon piezoresistance formula sensors and electric power generating composition, described monocrystalline silicon piezoresistance formula sensor is installed on the tank bottoms fuel outlet valve position of converter power transformer, obtain the pressure signal of fuel outlet valve position, undertaken amplifying by signal processing circuit, temperature compensation, obtain the height of pasta after analog to digital conversion and scale transformation.
Described monocrystalline silicon piezoresistance formula sensor is p type single crystal silicon piezoresistive transducer.
Described signal processing circuit comprises the pre-amplification circuit, temperature-compensation circuit, analog to digital conversion circuit and the processor that connect successively, and described pre-amplification circuit connects metering circuit, and described processor connects display.
Described temperature-compensation circuit comprises the first resistance, second resistance, 3rd resistance, 4th resistance, zero-regulator resistor, compensating resistance and diode, described first resistance, second resistance, 4th resistance, 3rd resistance, zero-regulator resistor forms closed loop after being connected successively with the first resistance, described compensating resistance and the second resistor coupled in parallel, the negative electrode of described diode connects the contact of the first resistance and the second resistance, the contact of described zero-regulator resistor and the 3rd resistance, the contact of the second resistance and the 4th resistance is voltage input end, and connect pre-amplification circuit, the anode of described diode, the contact of the 3rd resistance and the 4th resistance is voltage output end, and connect analog to digital conversion circuit.
Also comprise the wireless launcher connecting display, described wireless launcher connects remote monitoring platform by wireless network.
Also comprise the audible-visual annunciator connecting display.
Compared with prior art, the present invention has the following advantages:
1) overcome the defect that machinist's oil level indicator is observed difficulty and be there is secondary circuit failure, can detect fast and accurately operating converter power transformer actual insulation oil level, reliable parameter is provided to the inline diagnosis of change of current accident barrier.
2) p type single crystal silicon piezoresistive transducer measuring accuracy is higher, and simultaneous temperature compensating circuit overcomes the drift error that temperature causes, and ensure the accurate of measurement data, reliability is strong.
3) structure is simple, and cost is low, and it is convenient to install.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention;
Fig. 2 is p type single crystal silicon piezoresistive transducer structural representation;
Fig. 3 is bridge measuring circuit schematic diagram;
Fig. 4 is temperature-compensation circuit schematic diagram.
In figure: 1, bridge measuring circuit, 2, signal processing circuit, 3, display, 4, wireless launcher, 5, remote monitoring platform, 6, audible-visual annunciator, 7, p type single crystal silicon bar, 8, internal lead, 9, welding electrode, 10, outer lead, 11, housing, 21, pre-amplification circuit, 22, temperature-compensation circuit, 23, analog to digital conversion circuit, 24, processor, R1, the first resistance, R2, the second resistance, R3, the 3rd resistance, R4, the 4th resistance, Rs, zero-regulator resistor, Rp, compensating resistance, VD, diode, E, power supply, U
0, metering circuit export pressure signal, U
1, pre-amplification circuit export pressure signal, U, temperature-compensation circuit export pressure signal.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.The present embodiment is implemented premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the online oil level detection instrument of a kind of monocrystalline silicon piezoresistance formula comprises the metering circuit, signal processing circuit 2, display 3, wireless launcher 4 and the audible-visual annunciator 6 that connect successively, as shown in Figure 3, metering circuit is the bridge measuring circuit 1 be made up of four monocrystalline silicon piezoresistance formula sensors and power supply E, monocrystalline silicon piezoresistance formula sensor is installed on the tank bottoms fuel outlet valve position of converter power transformer, obtain the pressure signal of fuel outlet valve position, i.e. the pressure signal U of metering circuit output
0undertaken amplifying by signal processing circuit 2, temperature compensation, obtain the height of pasta after analog to digital conversion and scale transformation, fuel head is shown in display 3, wireless launcher 4 connects display 3, and connect remote monitoring platform 5 by wireless network, carry out the transmission of data, audible-visual annunciator 6 connects display 3 and can report to the police.
Wherein, monocrystalline silicon piezoresistance formula sensor is the p type single crystal silicon piezoresistive transducer that measuring accuracy is higher, as shown in Figure 2, p type single crystal silicon piezoresistive transducer comprises housing 11 and p type single crystal silicon bar 7, two internal leads 8, two welding electrodes 9 of being located in housing 11 and two outer leads 10, and p type single crystal silicon bar 7 end, internal lead 8, welding electrode 9 are connected successively with outer lead 10.
Signal processing circuit 2 comprises the pre-amplification circuit 21, temperature-compensation circuit 22, analog to digital conversion circuit 23 and the processor 24 that connect successively, and pre-amplification circuit 21 connects bridge measuring circuit 1, and processor 24 connects display 3.
As shown in Figure 4, temperature-compensation circuit 22 comprises the first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, zero-regulator resistor Rs, compensating resistance and diode VD, first resistance R1, second resistance R2, 4th resistance R4, 3rd resistance R3, zero-regulator resistor Rs forms closed loop after being connected successively with the first resistance R1, compensating resistance is in parallel with the second resistance R2, the negative electrode of diode VD connects the contact of the first resistance R1 and the second resistance R2, the contact of zero-regulator resistor Rs and the 3rd resistance R3, the contact of the second resistance R2 and the 4th resistance R4 is voltage input end, and connect pre-amplification circuit 21, the pressure signal U that pre-amplification circuit exports
1input temp compensating circuit 22, the anode of diode VD, the contact of the 3rd resistance R3 and the 4th resistance R4 are voltage output end, and connect analog to digital conversion circuit 23, and the pressure signal U that temperature-compensation circuit exports inputs analog to digital conversion circuit 23.
Processor 24 obtains the pressure signal after amplification, temperature compensation, digital-to-analog conversion, calculates and obtains pressure p, and then by formula p=ρ gh, obtain the height h of fuel outlet valve position and pasta, ρ is fluid density, and g is acceleration of gravity, thus calculates the oil surface level of converter power transformer.
Claims (6)
1. the online oil level detection instrument of monocrystalline silicon piezoresistance formula, comprise the metering circuit, signal processing circuit and the display that connect successively, it is characterized in that, described metering circuit is the bridge measuring circuit by four monocrystalline silicon piezoresistance formula sensors and electric power generating composition, described monocrystalline silicon piezoresistance formula sensor is installed on the tank bottoms fuel outlet valve position of converter power transformer, obtain the pressure signal of fuel outlet valve position, undertaken amplifying by signal processing circuit, temperature compensation, obtain the height of pasta after analog to digital conversion and scale transformation.
2. the online oil level detection instrument of a kind of monocrystalline silicon piezoresistance formula according to claim 1, is characterized in that, described monocrystalline silicon piezoresistance formula sensor is p type single crystal silicon piezoresistive transducer.
3. the online oil level detection instrument of a kind of monocrystalline silicon piezoresistance formula according to claim 1, it is characterized in that, described signal processing circuit comprises the pre-amplification circuit, temperature-compensation circuit, analog to digital conversion circuit and the processor that connect successively, described pre-amplification circuit connects metering circuit, and described processor connects display.
4. the online oil level detection instrument of a kind of monocrystalline silicon piezoresistance formula according to claim 1, it is characterized in that, described temperature-compensation circuit comprises the first resistance, second resistance, 3rd resistance, 4th resistance, zero-regulator resistor, compensating resistance and diode, described first resistance, second resistance, 4th resistance, 3rd resistance, zero-regulator resistor forms closed loop after being connected successively with the first resistance, described compensating resistance and the second resistor coupled in parallel, the negative electrode of described diode connects the contact of the first resistance and the second resistance, the contact of described zero-regulator resistor and the 3rd resistance, the contact of the second resistance and the 4th resistance is voltage input end, and connect pre-amplification circuit, the anode of described diode, the contact of the 3rd resistance and the 4th resistance is voltage output end, and connect analog to digital conversion circuit.
5. the online oil level detection instrument of a kind of monocrystalline silicon piezoresistance formula according to claim 1, is characterized in that, also comprise the wireless launcher connecting display, described wireless launcher connects remote monitoring platform by wireless network.
6. the online oil level detection instrument of a kind of monocrystalline silicon piezoresistance formula according to claim 1, is characterized in that, also comprises the audible-visual annunciator connecting display.
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| CN201510395574.8A CN104913829A (en) | 2015-07-07 | 2015-07-07 | Single crystal silicon piezoresistive type online oil level detector |
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| CN201510395574.8A CN104913829A (en) | 2015-07-07 | 2015-07-07 | Single crystal silicon piezoresistive type online oil level detector |
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Cited By (3)
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| CN106441403A (en) * | 2016-09-19 | 2017-02-22 | 苏州戎维邦信息技术有限公司 | Method for zeroing initial null voltage of bridge sensor |
| CN109297539A (en) * | 2018-11-01 | 2019-02-01 | 国家电网有限公司 | Portable transformer oil pillow oil level detection device |
| CN110779597A (en) * | 2019-11-13 | 2020-02-11 | 国网甘肃省电力公司检修公司 | High-precision measuring device and method for liquid level of transformer oil tank based on pressure sensor |
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| CN106441403A (en) * | 2016-09-19 | 2017-02-22 | 苏州戎维邦信息技术有限公司 | Method for zeroing initial null voltage of bridge sensor |
| CN106441403B (en) * | 2016-09-19 | 2019-03-08 | 苏州戎维邦信息技术有限公司 | Bridge type magnetic sensor initial zero position voltage adjusting zero method |
| CN109297539A (en) * | 2018-11-01 | 2019-02-01 | 国家电网有限公司 | Portable transformer oil pillow oil level detection device |
| CN109297539B (en) * | 2018-11-01 | 2024-03-01 | 国家电网有限公司 | Portable transformer oil pillow oil level detection device |
| CN110779597A (en) * | 2019-11-13 | 2020-02-11 | 国网甘肃省电力公司检修公司 | High-precision measuring device and method for liquid level of transformer oil tank based on pressure sensor |
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Application publication date: 20150916 |