CN203551678U - Online monitoring system of amorphous alloy tridimensional toroidal-core transformer - Google Patents
Online monitoring system of amorphous alloy tridimensional toroidal-core transformer Download PDFInfo
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- CN203551678U CN203551678U CN201320520068.3U CN201320520068U CN203551678U CN 203551678 U CN203551678 U CN 203551678U CN 201320520068 U CN201320520068 U CN 201320520068U CN 203551678 U CN203551678 U CN 203551678U
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Abstract
The utility model relates to an online monitoring system of an amorphous alloy tridimensional toroidal-core transformer. The system comprises a lower computer system and an upper computer system, wherein the lower computer system comprises an A/D (Analog/Digital) conversion module, and the input end of the A/D conversion module is connected with three signal conditioning circuits which are respectively connected to a straight-through current transformer, a fiber grating sensor and an ultrahigh frequency partial discharge sensor. According to the system provided by the utility model, signals are respectively detected by the straight-through current transformer, the fiber grating sensor and the ultrahigh frequency partial discharge sensor, the signals are respectively conditioned by the three signal conditioning circuits, are A/D converted and are processed, the processed signals are transmitted to the upper computer system, and the upper computer system respectively analyzes and processes three signals, displays the signals through an LED (Light Emitting Diode) display screen, and controls an alarm module to alarm if the detected signals exceed a threshold, so as to achieve real-time online monitor of the amorphous alloy tridimensional toroidal-core transformer.
Description
Technical field
The utility model relates to transformer monitoring system, refers to particularly a kind of on-line monitoring system of stereo amorphous alloy wound iron core transformer, belongs to power industry T & D Technology field.
Background technology
Power transformer is one of most important equipment in electric system, and its operation conditions is directly connected to the safety of whole electric system and stablizes.And stereo amorphous alloy wound iron core is as the core component of amorphous alloy transformer, if break down, can bring serious consequence to transformer, and then whole electric system is caused damage, therefore to amorphous alloy transformer body with and the stereo amorphous alloy wound iron core fault that may occur that is in operation carry out real time on-line monitoring, for the safe operation that guarantees transformer, have important meaning.
Transformer fault comprises overheating fault and insulation fault, and wherein, overheating fault comprises that multipoint earthing of iron core can cause overheating fault and the inner overheating fault producing of transformer of transformer.For above-mentioned fault, mainly adopt following methods at present:
One, judge at present iron core whether the method for multipoint earthing mainly contain electric-resistivity method and the gas chromatography of clamp on amperemeter method, iron core insulation against ground, the multipoint earth faults that these three kinds of methods all can not real-time judge iron core, and can not realize on-line monitoring.
Two, for finding whether transformer inside has overheating fault, the main measuring method of electric signal sensor and infrared temperature sensor that adopts is to realize the temperature survey to transformer, these two kinds of methods all can be used sensor directly to contact with iron core, therefore have certain error.
Three, during transformer generation insulation fault, in transformer body, have the generation of partial discharge phenomenon, therefore the generation that whether transformer is had to a partial discharge phenomenon is monitored, can judge the insulation situation of transformer inside, the main method of the shelf depreciation of monitoring transformer has pulse current method, monitoring ultrasonic method, chemical measure at present, wherein pulse current method is a kind of the most frequently used method, but because it is subject to electromagnetic interference (EMI) serious, extract at the scene effective electric impulse signal difficulty, the reliability of the method is lower, therefore cannot carry out on-line monitoring; Monitoring ultrasonic method is owing to being vulnerable to the sound interference such as on-the-spot noise, and validity and the reliability of its system are lower, can not meet on-line monitoring requirement; Chemical measure is not method of real-time, and it can only describe the situation of transformer inside at no distant date, and it causes the reason of oil dissolved gas more, can not get rid of the erroneous judgement of the method to transformer internal operation state.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art and on-line monitoring system that a kind of stereo amorphous alloy wound iron core transformer is provided, this on-line monitoring system can Real-Time Monitoring transformer in the situation of multipoint earthing, temperature and shelf depreciation, for guaranteeing that the good operation of transformer provides in real time data accurately.
The technical scheme that realizes the employing of the utility model object is: a kind of on-line monitoring system of stereo amorphous alloy wound iron core transformer, comprising:
Lower computer system, comprise A/D modular converter, and the first signal modulate circuit, secondary signal modulate circuit and the 3rd signal conditioning circuit that connect respectively described A/D modular converter input end, described first signal modulate circuit, secondary signal modulate circuit and the 3rd signal conditioning circuit are connected respectively straight-through current transformer, fiber-optic grating sensor and ultrahigh frequency office and put sensor; Described A/D modular converter output terminal is connected with signal processing module; And
Master system, is connected with described signal processing module.
In technique scheme, described signal processing module comprises:
Dsp chip, for the treatment of the signal of first signal modulate circuit output;
ARM chip, for the treatment of the signal of secondary signal modulate circuit output; And
Background computer system, for the treatment of the signal of the 3rd signal conditioning circuit output.
Further, described first signal modulate circuit comprises the first amplifying circuit, filtering circuit and the buffer circuit that electric signal connects successively.
Further, described secondary signal modulate circuit comprises the second amplifying circuit, and the input end of described the second amplifying circuit connects respectively the photoelectric switching circuit being formed by connecting by boundary filter and the first photodetector, and the second photodetector; The output terminal of described the second amplifying circuit successively electric signal connects subtraction circuit and active second-order filter circuit.
Further, described the 3rd signal conditioning circuit comprises bandpass filter, prime amplifier, frequency mixer, frequency synthesizer, low-pass filter and the post amplifier that electric signal successively connects, and described bandpass filter is put sensor with described ultrahigh frequency office and is connected.
Further, described frequency mixer is also connected with frequency synthesizer, and described frequency synthesizer is connected with described background computer system, and described background computer system controlled frequency synthesizer produces required local oscillation signal.
In technique scheme, described master system comprises: control computing machine, and the light-emitting diode display and the alarm module that are connected with described control computing machine respectively.
The utility model lower computer system adopts straight-through current transformer can obtain accurately current signal to correctly reflect the situation of change of iron core grounding current; Adopt fiber-optic grating sensor to measure in real time winding temperature; Adopt ultrahigh frequency office to put sensor and in uhf-range, extract the electromagnetic wave signal that shelf depreciation produces, to realize the detection to partial discharge of transformer.
Lower computer system is put after signal that sensor detects is processed and is transferred to master system above-mentioned straight-through current transformer, fiber-optic grating sensor and ultrahigh frequency office respectively again, master system is analyzed the data that slave computer transmission comes, and in LED screen display, if surpass safe range, start warning system.
The utlity model has following advantage:
(1) straight-through current transformer used has advantages of that precision is high, and is not electrically connected with transformer, on the operation of transformer, can not produce any impact.
(2) fiber-optic grating sensor used can stick in Transformer Winding and measure winding temperature, and comparing with traditional method and can guaranteeing to record temperature is actual winding temperature.In addition, fiber-optic grating sensor is output as light signal, and anti-electromagnetic interference capability is strong, and insulating property are high, and sensitivity and measuring accuracy all increase.
(3) because oil electric discharge rising edge in oil tank of transformer is very steep, pulse width mostly is nanoscale, and ultrahigh frequency used office puts sensor and can encourage ultra-high frequency signal more than 1GHz.Therefore, extract the electromagnetic wave signal that shelf depreciation produces in uhf-range, external interference exists hardly, and antijamming capability is strong, strong raising reliability and the sensitivity of partial discharge monitoring.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the on-line monitoring system of the utility model stereo amorphous alloy wound iron core transformer;
Fig. 2 is the structured flowchart of first signal modulate circuit in Fig. 1;
Fig. 3 is the structured flowchart of secondary signal modulate circuit in Fig. 1;
Fig. 4 is the structured flowchart of the 3rd signal conditioning circuit in Fig. 1.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, the on-line monitoring system of the utility model stereo amorphous alloy wound iron core transformer comprises master system and lower computer system.
Wherein, master system comprises control computing machine, light-emitting diode display and alarm module.
Lower computer system comprises A/D modular converter, the input end of A/D modular converter is connected with signal conditioning circuit, signal conditioning circuit comprises first signal modulate circuit, secondary signal modulate circuit and the 3rd signal conditioning circuit, and first signal modulate circuit, secondary signal modulate circuit are put sensor with straight-through current transformer, fiber-optic grating sensor with ultrahigh frequency office respectively with the 3rd signal conditioning circuit and be connected; The output terminal of A/D modular converter is connected with signal processing module, and signal processing module comprises dsp chip, ARM chip and background computer system.Signal processing module is connected with master system.Signal conditioning circuit, A/D modular converter and signal processing module are connected with power supply and clock module.
In the present embodiment, lower computer system and signal processing module carry out data transmission by RS485 message protocol, add verification in host-host protocol, to guarantee the transmitting of data.
As shown in Figure 2, this first signal modulate circuit comprises the first amplifying circuit, filtering circuit and the buffer circuit that electric signal connects successively to the structure of the present embodiment first signal modulate circuit used.
Straight-through current transformer obtains iron core grounding current signal by being sleeved on transformer core grounding line, and therefore can obtain real current signal reflects the situation of change of iron core grounding current with this.Straight-through current transformer is connected with amplifying circuit, to obtain iron core grounding current signal input amplifying circuit, the first amplifying circuit passes through filtering circuit after faint electric signal is amplified, input isolation circuit after filtering circuit filtering clutter, buffer circuit is for isolating the signal after iron core grounding current signal and processing of circuit.
The analog electrical signal of buffer circuit output is by after A/D modular converter, be converted to digital signal, the digital signal being converted to enters dsp chip and carries out data processing, data processing is the FFT(fast fourier transform based on time-domain signal being converted into frequency-region signal) algorithm, fft algorithm is to be got by Fourier series, characterized that each sampled point is comprised of the waveform of different frequency composition, its formula table is shown:
Fft algorithm carries out computing by data, current signal is decomposed into the current value of fundamental signal and the current value of each harmonic signal, this current value is transferred in the control computing machine of master system, controls computing machine and judges according to these current values whether iron core occurs the situation of multipoint earthing.
The structure of the present embodiment secondary signal modulate circuit used as shown in Figure 3, this secondary signal modulate circuit comprises the second amplifying circuit, the input end of described the second amplifying circuit connects respectively the photoelectric switching circuit being formed by connecting by boundary filter and the first photodetector, and the second photodetector; The output terminal of described the second amplifying circuit successively electric signal connects subtraction circuit and active second-order filter circuit.
Fiber-optic grating sensor is a constant relevant to material coefficient substantially to the sensitivity coefficient of temperature, therefore fiber-optic grating sensor has good output characteristics to temperature.In the present embodiment, to the light signal of fiber-optic grating sensor collection, adopt demodulation by filter method to carry out demodulation, the light signal that soon sensing grating will be reflected back is divided into two bundles, wherein a branch of by conduct analysis light intensity signal p1 after boundary filter and the first photodetector, another bundle by the second photodetector as with reference to light intensity signal p2, analyze light intensity signal p1 and through the second amplifying circuit amplifying signal, signal do not flooded with reference to light intensity signal p2 by circuit noise, by subtraction circuit, eliminate initial error again, finally by active second-order filter circuit filtering clutter, the output impedance of the present embodiment secondary signal modulate circuit used is low, amplifying power is strong.
The analog electrical signal of active second-order filter circuit output is by after A/D modular converter, be converted to digital signal, the digital signal being converted to enters ARM chip and carries out data processing, ARM chip carries out computing according to formula (p1-p2)/(p1+p2), result of calculation is directly proportional to wavelength variations, thereby obtains the linear relationship of temperature and output.This result of calculation is transferred in the control computing machine of master system, controls computing machine according to the temperature conditions of result of calculation judgement transformer.
The structure of the present embodiment the 3rd signal conditioning circuit used as shown in Figure 4, the 3rd signal conditioning circuit comprises bandpass filter, prime amplifier, frequency mixer, frequency synthesizer, low-pass filter and the post amplifier that electric signal connects successively, wherein, bandpass filter is put sensor with described ultrahigh frequency office and is connected, and frequency mixer is also connected with frequency synthesizer.
The present embodiment ultrahigh frequency used office puts sensor and adopts built-in mode, and just ultrahigh frequency office puts that sensor is charged to be arranged on transformer fuel tap, and ultrahigh frequency office puts in the casing that sensor head can stretch into fuel tank.Because the rising edge that discharges in oil is very steep, pulse width mostly is nanoscale, can encourage ultra-high frequency signal more than 1GHz, therefore in uhf-range, extract the electromagnetic wave signal that shelf depreciation produces, external interference exists hardly, antijamming capability is strong, strong raising reliability and the sensitivity of partial discharge monitoring.The signal of sensor detection is put by the 3rd signal conditioning circuit in ultrahigh frequency office, wherein by amplifying by prime amplifier after the signal below bandpass filter filtering 1GHz, then by frequency mixer, carry out frequency reducing, mixer output signal is by low-pass filter filtering, what in system, finally need is the low frequency part in intermediate-freuqncy signal, it is the difference frequency signal of input signal and local oscillation signal, therefore can filter local oscillation signal and other frequency content in intermediate-freuqncy signal by low-pass filter, amplify by post amplifier more afterwards.
Analog electrical signal through post amplifier output passes through, after A/D modular converter, to be converted to digital signal, and the digital signal being converted to enters background computer system and carries out data processing.Background computer system comprises data acquisition module, discharge signal conditioning module, communication module and computing machine, for completing the automatic cycle of transformer partial discharge signal to be monitored and manually detecting.Background computer system obtains partial discharge of transformer main parameter after data processing: discharge phase (ψ), electric discharge repetition rate, discharge charge (q), firing potential (Ui) and discharge quenching voltage (Ue).
Frequency synthesizer in the 3rd signal conditioning circuit is for generation of the local oscillation signal meeting the demands, the centre frequency of adjustable collection signal thus, and the core component of frequency synthesizer is voltage controlled oscillator.Computing machine in background computer system provides instruction controlled frequency synthesizer by parallel interface, and frequency synthesizer provides suitable magnitude of voltage with this and drives voltage controlled oscillator, with this, regulates the centre frequency of collection signal.
Background computer system is transferred to the partial discharge of transformer main parameter obtaining in the control computing machine of master system, control computing machine and can obtain two-dimentional spectrogram according to above-mentioned characterization parameter, for example: electric discharge amplitude-phase place (U-ψ), maximum electric discharge amplitude-phase place (Umax-ψ), discharge time-phase place (N-ψ), discharge time-electric discharge amplitude (N-ψ), control computing machine and judge in transformer body whether have shelf depreciation according to two-dimentional spectrogram, with this, predict whether transformer insulation fault occurs.
The utility model passes through straight-through current transformer, sensor detection signal is respectively put in fiber-optic grating sensor and ultrahigh frequency office, again respectively by first, the second and the 3rd signal conditioning circuit carries out by A/D, changing after signal condition, through signal processing module settling signal, process again, signal after processing is transferred in the control computing machine of master system, control computing machine three kinds of signals are carried out respectively to analyzing and processing, and show by LED display, if the signal detecting surpasses threshold value, controlling alarm module reports to the police, thereby realize the real time on-line monitoring to stereo amorphous alloy wound iron core transformer.
Claims (7)
1. an on-line monitoring system for stereo amorphous alloy wound iron core transformer, is characterized in that, comprising:
Lower computer system, comprise A/D modular converter, and the first signal modulate circuit, secondary signal modulate circuit and the 3rd signal conditioning circuit that connect respectively described A/D modular converter input end, described first signal modulate circuit, secondary signal modulate circuit and the 3rd signal conditioning circuit are connected respectively straight-through current transformer, fiber-optic grating sensor and ultrahigh frequency office and put sensor; Described A/D modular converter output terminal is connected with signal processing module; And
Master system, is connected with described signal processing module.
2. the on-line monitoring system of stereo amorphous alloy wound iron core transformer according to claim 1, is characterized in that, described signal processing module comprises:
Dsp chip, for the treatment of the signal of first signal modulate circuit output;
ARM chip, for the treatment of the signal of secondary signal modulate circuit output; And
Background computer system, for the treatment of the signal of the 3rd signal conditioning circuit output.
3. according to the on-line monitoring system of stereo amorphous alloy wound iron core transformer described in claim 1 or 2, it is characterized in that: described first signal modulate circuit comprises the first amplifying circuit, filtering circuit and the buffer circuit that electric signal connects successively.
4. according to the on-line monitoring system of stereo amorphous alloy wound iron core transformer described in claim 1 or 2, it is characterized in that: described secondary signal modulate circuit comprises the second amplifying circuit, the input end of described the second amplifying circuit connects respectively the photoelectric switching circuit being formed by connecting by boundary filter and the first photodetector, and the second photodetector; The output terminal of described the second amplifying circuit successively electric signal connects subtraction circuit and active second-order filter circuit.
5. the on-line monitoring system of stereo amorphous alloy wound iron core transformer according to claim 2, it is characterized in that: described the 3rd signal conditioning circuit comprises bandpass filter, prime amplifier, frequency mixer, frequency synthesizer, low-pass filter and the post amplifier that electric signal successively connects, described bandpass filter is put sensor with described ultrahigh frequency office and is connected.
6. the on-line monitoring system of stereo amorphous alloy wound iron core transformer according to claim 5, it is characterized in that: described frequency mixer is also connected with frequency synthesizer, described frequency synthesizer is connected with described background computer system, and described background computer system controlled frequency synthesizer produces required local oscillation signal.
7. the on-line monitoring system of stereo amorphous alloy wound iron core transformer according to claim 1, is characterized in that, described master system comprises: control computing machine, and the light-emitting diode display and the alarm module that are connected with described control computing machine respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320520068.3U CN203551678U (en) | 2013-08-23 | 2013-08-23 | Online monitoring system of amorphous alloy tridimensional toroidal-core transformer |
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| CN201320520068.3U CN203551678U (en) | 2013-08-23 | 2013-08-23 | Online monitoring system of amorphous alloy tridimensional toroidal-core transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569664A (en) * | 2014-12-24 | 2015-04-29 | 镇江长河电力技术有限公司 | Analytic system provided with energy efficiency online monitoring and analyzing device for distribution transformer |
| CN106154200A (en) * | 2016-06-15 | 2016-11-23 | 贵州电网有限责任公司六盘水供电局 | Portable GIS local discharge high frequency sensors test device and method of testing |
| CN110940880A (en) * | 2019-12-09 | 2020-03-31 | 湖南文理学院 | Intelligent power transformer monitoring system based on wireless data transmission |
-
2013
- 2013-08-23 CN CN201320520068.3U patent/CN203551678U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569664A (en) * | 2014-12-24 | 2015-04-29 | 镇江长河电力技术有限公司 | Analytic system provided with energy efficiency online monitoring and analyzing device for distribution transformer |
| CN106154200A (en) * | 2016-06-15 | 2016-11-23 | 贵州电网有限责任公司六盘水供电局 | Portable GIS local discharge high frequency sensors test device and method of testing |
| CN106154200B (en) * | 2016-06-15 | 2023-04-07 | 贵州电网有限责任公司六盘水供电局 | Portable GIS partial discharge high-frequency sensor testing device and testing method |
| CN110940880A (en) * | 2019-12-09 | 2020-03-31 | 湖南文理学院 | Intelligent power transformer monitoring system based on wireless data transmission |
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