CN102998605A - System and method for signal modulation for panoramic partial discharge monitoring of transformer substation - Google Patents
System and method for signal modulation for panoramic partial discharge monitoring of transformer substation Download PDFInfo
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- CN102998605A CN102998605A CN2012105220278A CN201210522027A CN102998605A CN 102998605 A CN102998605 A CN 102998605A CN 2012105220278 A CN2012105220278 A CN 2012105220278A CN 201210522027 A CN201210522027 A CN 201210522027A CN 102998605 A CN102998605 A CN 102998605A
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Abstract
The invention discloses a system and a method for signal modulation for panoramic partial discharge monitoring of a transformer substation. The system comprises an amplifying unit, a conversion unit, a detection unit, a master control unit and a conversion circuit, wherein the amplifying unit is used for conducting gain adjustment on monitoring signals, the conversion unit is used for conducting power voltage conversion on signal data output by the amplifying unit, the detection unit is used for obtaining characteristic values of the signal data output by the conversion unit, the master control unit is used for controlling and processing the signal data output by the detection unit, the conversion circuit comprises a logarithmic converter and a detector, the logarithmic converter is used for converting radio-frequency signals into voltage signals, and the detector is used for processing signals output by the logarithmic converter. The system and the method have the advantages of being capable of monitoring partial discharge signals of all electrical devices in the transformer substation in real time, monitoring peak values, effective values and abnormities such as frequencies through obtaining of information of characteristic values, detecting electrical and mechanical faults timely and greatly expanding the application range of panoramic partial discharge monitoring of the transformer substation.
Description
Technical field
The invention belongs to the power technology field, be specifically related to a kind of signal modulating system and method for putting monitoring for panorama office of transformer station, further, relate to a kind of change-over circuit.
Background technology
The panorama monitoring of transformer station generally can be divided into process layer, wall and three levels of station level on logical organization, wherein, process layer is the faying face of primary equipment and secondary device, and its major function is: carry out the detection of the characteristic parameter of power transmission and transforming equipment, the online detection of state parameter and the tasks such as execution that statistics, operation are controlled; The major function of wall is: carry out the gathering of this interval procedure layer real time data information, data are processed, implemented primary equipment is implemented protection control function, have the effect of forming a connecting link; The station level main task is: the real time data information that gathers full station, operation conditions to full station is carried out quality evaluation, with the scheduling of relevant data direct information or control center and acceptance scheduling or control center's relevant controlling order, send the functions such as control command to wall, process layer.
Shelf depreciation is an important symbol of reflection converting station high voltage electrical apparatus state, by the monitoring to the state parameter of the real time status of inner each electrical equipment of reflection transformer station, namely obtain the ultrasonic signal that shelf depreciation that the fault of insulation ag(e)ings such as causing transformer station, cable termination and joint follows and particle collision produce, just can know such as: in the tested electrical equipment shelf depreciation and particle collide and power frequency electric field between the information such as relation.Prior art is limited to the application power of the local discharge signal monitoring of each electrical equipment of transformer station, especially can not be intuitively and obtain in a wide range the information of the associated eigenvalue such as effective value, peak value of local discharge signal, thus can't realize the fully and effectively monitoring of panorama shelf depreciation to transformer station.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of signal modulating system of putting monitoring for panorama office of transformer station, it can be converted to characteristic value information to the local discharge signal of monitoring and obtain, and has greatly expanded the range of application of transformer station's panorama partial discharge monitoring.
For achieving the above object, technical scheme of the present invention is achieved in that a kind ofly puts the signal modulating system of monitoring for panorama office of transformer station, it is characterized in that, comprising: the amplifying unit that is used for monitor signal is carried out gain-adjusted; Be used for and carry out the converting unit that power voltage is changed through the signal data of amplifying unit output; Be used for and carry out the detecting unit that eigenwert is obtained through the signal data of converting unit output; And be used for to control the main control unit of processing through the signal data of detecting unit output.
Described converting unit comprises logarithmic converter.
Described detecting unit comprises the two-way switch device, and it connects the first detecting device and the second detecting device.
Described the first detecting device is peak detctor; Described the second detecting device is the RMS to DC device.
Described main control unit comprises microprocessor, and described microprocessor is connected with mould/number conversion module and input/output bus control module.
Described main control unit also comprises display module, and it is connected with microprocessor.
Further, a kind ofly put the signal modulating method of monitoring for panorama office of transformer station, it is characterized in that, comprising: step 1, amplifying unit is to the monitor signal amplification that gains; Step 2, converting unit is carried out the power voltage conversion to the signal data through amplifying unit output; Step 3, detecting unit are carried out eigenwert to the signal data through converting unit output and are obtained; Step 4, main control unit is to controlling processing through the signal data of detecting unit output.
Described step 3 specifically comprises: detecting unit carries out peak value to the signal data through converting unit output and detects and RMS to DC.
Also comprise: main control unit shows fail result to after controlling processing through the signal data of detecting unit output.
Further, a kind of change-over circuit comprises: the logarithmic converter that is used for radiofrequency signal is converted to voltage signal; And be used for the detecting device that to process through the signal that logarithmic converter is exported.
The present invention has following beneficial effect with respect to prior art:
The local discharge signal of each electrical equipment such as transformer, reactor in the Real-Time Monitoring transformer station, by obtaining the information of its eigenwert, can monitor the unusual of peak value, effective value and frequency etc., in time find electric, the mechanical fault of each electrical equipment in the transformer station, assist reliably foundation for the repair based on condition of component work of transformer station provides.
Description of drawings
Fig. 1 is of the present inventionly put the structure principle chart of the signal modulating system of monitoring for panorama office of transformer station;
Fig. 2 is the specific embodiment structural representation of system shown in Figure 1;
Fig. 3 is a kind of physical circuit figure of amplifier embodiment illustrated in fig. 2;
Fig. 4 is a kind of physical circuit figure of peak detctor embodiment illustrated in fig. 2;
Fig. 5 is a kind of physical circuit figure of RMS to DC device embodiment illustrated in fig. 2;
Fig. 6 is the schematic flow sheet of putting the signal modulating method of monitoring for panorama office of transformer station of the present invention;
Fig. 7 is the schematic diagram of change-over circuit of the present invention.
Embodiment
For the ease of the further understanding to invention, below in conjunction with accompanying drawing the specific embodiment of the present invention is done further detailed description.
As shown in Figure 1, signal modulating system of putting monitoring for panorama office of transformer station of the present invention comprises: the amplifying unit 110 that is used for monitor signal is carried out gain-adjusted; Be used for and carry out the converting unit 120 that power voltage is changed through the signal data of amplifying unit 110 outputs; Be used for and carry out the detecting unit 130 that eigenwert is obtained through the signal data of converting unit 120 outputs; And be used for to control the main control unit 140 of processing through the signal data of detecting unit 130 outputs.
Fig. 2 is the specific embodiment structural representation of system shown in Figure 1, and as shown in the figure, described amplifying unit 110 comprises amplifier 111, and described converting unit 120 comprises logarithmic converter 121.As specific embodiment, logarithmic converter can adopt AD8306, can carry out accurate logarithm (dB) to input signal in 100 dB dynamic ranges and measure (RSSI function), and limiter output able to programme is provided, and operating frequency range is 5 MHz to 400 MHz.
Described detecting unit 130 comprises two-way switch device 131, and it connects the first detecting device 135 and the second detecting device 136.Described the first detecting device 135 is peak detctor; Described the second detecting device 136 is the RMS to DC device.
Described main control unit 140 comprises microprocessor 143, and described microprocessor 143 is connected with ADC module 145 and input/output bus control module 147, and input/output bus control module 147 also is connected with DAC module 144.Described main control unit 140 also comprises display module 149, and it is connected with microprocessor 143.As specific embodiment, microprocessor 143 adopts ARM.
Certainly, as the distortion of embodiment, main control unit also can be finished with the FPGA design.
Fig. 3 is a kind of physical circuit figure of amplifier embodiment illustrated in fig. 2, as shown in the figure, the in the same way input end of U1 is used for input signal, the end of reverse input end contact resistance R13 and the end of R14, the other end ground connection of resistance R 13, the other end of resistance R 14 connects the output terminal of U1, and resistance R 13 and R14 are feedback resistance, forms an in the same way amplifying circuit with U1.As specific embodiment, U1 can adopt AD825.
Fig. 4 is a kind of physical circuit figure of peak detctor embodiment illustrated in fig. 2, as shown in the figure, the in the same way input end of U3 connects the signal output part of upper level, the end of reverse input end contact resistance R24 and an end of resistance R 25, the other end of R25 is connected with output terminal with the reverse input end of U2, the other end of R24 connects the positive pole of diode D1, the negative pole of D1 connects the output terminal of U3 and the positive pole of diode D2, the negative pole of D2 connects the in the same way input end of U2 and an end of capacitor C 2, the other end ground connection of C2, signal is through after U2 and the U3, and its peak volume is maintained in the capacitor C 2, then can export peak value.As specific embodiment, U2 and U3 can adopt AD825.
Fig. 5 is a kind of physical circuit figure of RMS to DC device embodiment illustrated in fig. 2, as shown in the figure, the p1 pin of U4 connects an end of capacitor C 4 and an end of resistance R 22, COM pin and the UTO pin of the other end of C4 and U4 join, the other end of R22 connects the d1 pin of U1, one end of RMSut pin and capacitor C 9, the other end of C9 is connected with the Cav pin of U4, the end of the p0 pin contact resistance R20 of U4, the other end of R20 connects an end of capacitor C 10, the end of the other end contact resistance R21 of C10, the other end of R21 connects capacitor C 11, and the VIN pin of the other end of C11 and U4 joins, signal is output as the effective value direct current signal by this RMS to DC device.
As specific embodiment, U4 can adopt AD637, and this chip provides the crest factor compensation scheme, allows the crest factor measurement signal to be up to 10, and extra error is less than 1%.Bandwidth allows to measure 200 mV root mean square, frequency is up to the input signal of 600 kHz and the input signal that 1 V root mean square is above, frequency is up to 8 MHz.
Fig. 6 is the schematic flow sheet of putting the signal modulating method of monitoring for panorama office of transformer station of the present invention, as shown in the figure, comprising: step S110,110 pairs of monitor signals of the amplifying unit amplification that gains; Step S120,120 pairs of signal datas through amplifying unit 110 outputs of converting unit carry out the power voltage conversion; Step S130,130 pairs of signal datas through converting unit 120 outputs of detecting unit carry out eigenwert and obtain; Step S140,140 pairs of signal datas through detecting unit 130 outputs of main control unit are controlled processing.
Described step S130 specifically comprises: 130 pairs of signal datas through converting unit 120 outputs of detecting unit carry out peak value and detect and RMS to DC.
Distortion as present embodiment, when main control unit comprises display module 149, the signal modulating method of putting monitoring for panorama office of transformer station of the present invention also comprises: after 140 pairs of signal datas through detecting unit 130 outputs of main control unit are controlled processing, show fail result.
Fig. 7 is the schematic diagram of change-over circuit of the present invention, as shown in the figure, comprising: the logarithmic converter that is used for radiofrequency signal is converted to voltage signal; And be used for the detecting device that to process through the signal that logarithmic converter is exported.
This circuit can be applied to: with radiofrequency signal performance number (dB) convert to can collecting test dc voltage value, the scope of detection can be determined by the linear working range of logarithmic converter.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.
Claims (10)
1. one kind is used for the signal modulating system that monitoring is put in panorama office of transformer station, it is characterized in that, comprising:
Be used for monitor signal is carried out the amplifying unit of gain-adjusted;
Be used for and carry out the converting unit that power voltage is changed through the signal data of amplifying unit output;
Be used for and carry out the detecting unit that eigenwert is obtained through the signal data of converting unit output; And
Be used for to control the main control unit of processing through the signal data of detecting unit output.
2. system according to claim 1, it is characterized in that: described converting unit comprises logarithmic converter.
3. system according to claim 2, it is characterized in that: described detecting unit comprises the two-way switch device, it connects the first detecting device and the second detecting device.
4. system according to claim 3 is characterized in that:
Described the first detecting device is peak detctor;
Described the second detecting device is the RMS to DC device.
5. system according to claim 4, it is characterized in that: described main control unit comprises microprocessor, described microprocessor is connected with mould/number conversion module and input/output bus control module.
6. system according to claim 5, it is characterized in that: described main control unit also comprises display module, it is connected with microprocessor.
7. one kind is used for panorama office of transformer station and puts the signal modulating method of monitoring, it is characterized in that, comprising:
Step 1, amplifying unit is to the monitor signal amplification that gains;
Step 2, converting unit is carried out the power voltage conversion to the signal data through amplifying unit output;
Step 3, detecting unit are carried out eigenwert to the signal data through converting unit output and are obtained;
Step 4, main control unit is to controlling processing through the signal data of detecting unit output.
8. method according to claim 7 is characterized in that, step 3 specifically comprises: detecting unit carries out peak value to the signal data through converting unit output and detects and RMS to DC.
9. according to claim 7 or 8 described methods, it is characterized in that, also comprise: main control unit shows fail result to after controlling processing through the signal data of detecting unit output.
10. change-over circuit comprises:
Be used for radiofrequency signal is converted to the logarithmic converter of voltage signal; And
Be used for the detecting device that to process through the signal that logarithmic converter is exported.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105220278A CN102998605A (en) | 2012-12-07 | 2012-12-07 | System and method for signal modulation for panoramic partial discharge monitoring of transformer substation |
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| CN2012105220278A CN102998605A (en) | 2012-12-07 | 2012-12-07 | System and method for signal modulation for panoramic partial discharge monitoring of transformer substation |
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| EP0578024A1 (en) * | 1992-06-27 | 1994-01-12 | KRAUTKRÄMER GmbH & Co. | Ultrasonic measuring apparatus, especially for non-destructive testing of materials |
| CN101556302A (en) * | 2009-05-25 | 2009-10-14 | 博扬科仪电气技术(北京)有限公司 | Ultrasound partial discharge diagnostic equipment and method thereof |
| CN202075374U (en) * | 2011-05-04 | 2011-12-14 | 华北电力科学研究院有限责任公司 | Sleeve end shield discharging ultrasonic detection device |
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- 2012-12-07 CN CN2012105220278A patent/CN102998605A/en active Pending
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| CN2087777U (en) * | 1991-04-16 | 1991-10-30 | 民航东北管理局通信总站 | Ultrasonic intelligent charge-level detecting and controlling instrument |
| EP0578024A1 (en) * | 1992-06-27 | 1994-01-12 | KRAUTKRÄMER GmbH & Co. | Ultrasonic measuring apparatus, especially for non-destructive testing of materials |
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| CN202330624U (en) * | 2011-10-25 | 2012-07-11 | 章啸 | Partial discharge ultrasonic wave detection device |
| CN203037812U (en) * | 2012-12-07 | 2013-07-03 | 山西省电力公司吕梁供电公司 | Signal modulation system for panoramic partial discharge monitoring of transformer substation |
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Application publication date: 20130327 |