CN101030474A - Local digitizer of analog mutual inductor - Google Patents
Local digitizer of analog mutual inductor Download PDFInfo
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- CN101030474A CN101030474A CN 200710062740 CN200710062740A CN101030474A CN 101030474 A CN101030474 A CN 101030474A CN 200710062740 CN200710062740 CN 200710062740 CN 200710062740 A CN200710062740 A CN 200710062740A CN 101030474 A CN101030474 A CN 101030474A
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Abstract
The invention is concerned with the in-place digitization equipment of simulation quantity instrument transformer. It consists of: N transducer with small size, N signal collecting board and the power supply. The numeric area of N is the positive integer from 1 to 6; the connection of each part is: each inputting end of the small transducer connects with one outputting end of the traditional electromagnetism instrument transformer, each outputting end of the small transducer connects with the signal collecting board and forms the signal processing unit, N signal processing units connects with the power supply. The equipment solves the magnetic saturation problem of the traditional high voltage instrument transformer; the invention is with high accuracy in computation; convenient maintenance and operation; capability of working under long shift, stable and low cost.
Description
Technical field
The invention belongs to electrical equipment technical field, particularly traditional instrument transformer in-situ digitalization renovation technique.
Background technology
In transformer substation construction, divide current transformer and voltage transformer two kind, GB1207, GB1208 always based on traditional electromagnetic transformer recent decades.Its output current 5A/1A, voltage 100V/ analog signal is directly grown Distance Transmission to secondary devices such as control room relaying protection through cable.The advantage of this class instrument transformer is: have a large amount of, long-time running experience; Life-span is long, and be 30 years general designed life; Remove high pressure and superhigh pressure grade, with low cost.Its shortcoming is: have the magnetic saturation phenomenon; Non-environmental protection gases such as SF6 or liquid are arranged as megohmite insulant, the accidents such as combustion explosion that may occur; Electric pressure insulating Design cost become how much levels increase progressively, bulky; Its long Distance Transmission analog quantity increases the high accuracy design difficulty.
In recent years, along with the development of digitizing technique, digital transformer substation becomes inevitable trend, and the research of its capital equipment electronic mutual inductor (being also referred to as photo-electricity mutual-inductor) also constantly makes progress, and electronic mutual inductor is divided into two kinds of active formula and passive types.Wherein active formula development is rapid, and there has been product in China at hanging net operation.Electronic mutual inductor directly reacts by the variation of side analog quantity with its light digital quantity output.The advantage of electronic mutual inductor is: with the Rogowski coil is advantages such as the big electric current progress of disease that primary transducer is realized does not have magnetic saturation, frequency response range is wide, precision is high, transient characterisitics are good; There are not the accidents such as combustion explosion that the oil design has thoroughly avoided oil-filled mutual inductor to occur; The photoelectricity of high-low pressure part is isolated, and makes Current Transformer Secondary open circuit, voltage transformer secondary short circuit may cause problems such as crisis equipment or personal safety not exist; Because insulation system is simple, in high pressure and superhigh pressure, reduced the comprehensive use cost of photo-electricity mutual-inductor.
But existing electronic mutual inductor primary transducer is operated in the high-pressure side, to active formula, it requires very high to primary power source, it is main adopting the laser energy supply mode of laser at present, and its life-span remains to be tested, among the product reliability experience is still constantly accumulated, be in the product running experiment stage, in addition, costs such as Laser Power Devices, photocell are very high, improved whole cost.
Summary of the invention
The objective of the invention is to propose a kind of local digitizer of analog mutual inductor for overcoming the weak point of prior art, is primary transducer with traditional instrument transformer, designs local digitizer with the electronic mutual inductor notion of standard.Make traditional electromagnetic transformer can be fit to the needs that digital transformer substation is built.
The local digitizer (analog mutual inductor among the present invention is the instrument transformer with N road curtage output signal) of the analog mutual inductor that the present invention proposes, it is characterized in that, comprise N small-sized progress of disease device, a N signal acquiring board and power supply three parts, wherein, described small-sized progress of disease device is used for converting the output signal of analog mutual inductor to can supply signal acquiring board to sample voltage signal, described signal acquiring board is used for sampled signal is carried out analog-to-digital conversion, error correction and opto-electronic conversion, and receives sample command and send sampled data by optical fiber; Described power supply is used to supply with the DC power supply of each collection plate work; The span of N is the positive integer (value of N is corresponding with the multichannel output of traditional analog amount instrument transformer) of 1-6; The annexation of each several part is: the input of each small-sized progress of disease device links to each other with one road output of traditional electromagnetic transformer, the output of each small-sized progress of disease device links to each other with a signal acquiring board and constitutes one road signal processing unit, and N road signal processing unit all links to each other with described power supply.
Characteristics of the present invention and technique effect:
The present invention upwards accepts its output nearby at traditional electromagnetic transformer, transmits sampled data with digital optical signal according to certain communication format backward.To convert the signal that is suitable for fiber optic transmission system to from the analog signal in-situ digitalization of traditional curtage instrument transformer.Realize the synchronized sampling of multichannel current/voltage electromagnetic transformer by uplink synchronizing signals.
The present invention is on the basis of the reliability of conventional high-tension instrument transformer and long-time running stability, and the digital transformer substation that adopts the instrument transformer local digitizer to realize can guarantee safety, the reliability service of transformer station to a great extent.
Be mainly reflected in the following aspects:
(1) performance advantage
A, because of adopting the good optical fiber of electrical insulation capability as secondary circuit, effectively solved the electrical isolation of high-tension apparatus and secondary device;
B, eliminated voltage transformer secondary loop pressure drop problem;
C, can effectively improve the error characteristics of high-voltage electric-energy meter, and then greatly improve the accuracy of metering;
After D, employing " in-situ digitalization system " were handled, the secondary load of high-voltage mutual inductor reduced greatly, can effectively improve the intrinsic magnetic saturation problem of conventional high-tension instrument transformer;
E, in addition because of the high-voltage mutual inductor secondary load reduces, can fully guarantee the design accuracy of high-voltage mutual inductor itself;
F, because of to the maintenance of " in-situ digitalization system " only in low-pressure side, than electronic mutual inductor need safeguard in the high-pressure side simpler and more direct, have more operability;
G, because of the conventional high-tension instrument transformer has long-term actual field operating experience, the reliability and stability of its long-time running has more advantage than electronic mutual inductor;
H, meet the uniform protocol standard-IEC61850 stipulations of digital transformer substation, alternative electronic mutual inductor fully because of " in-situ digitalization system ";
The interoperability of I, all secondary devices of can be completely achieved and producing according to the IEC61850 stipulations.
(2) cost advantage
A, conventional high-tension instrument transformer are realized in batches suitability for industrialized production already, and its cost is with the obvious advantage than electronic mutual inductor in a short time;
B, with regard to the great number cost of the electronic mutual inductor operation maintenance that present crowd paid close attention to, adopt " in-situ digitalization system " after, can safeguard to transformer station hardly and bring extra maintenance expenditure.
Description of drawings
Fig. 1 is a general structure schematic diagram of the present invention.
Fig. 2 is that the signal acquiring board among Fig. 1 is formed structural representation
The second order Basel filter graph architecture that Fig. 3 adopts for the present invention.
The power source conversion schematic diagram that Fig. 4 adopts for the present invention
The flow chart of data processing figure that Fig. 5 adopts for the present invention
Embodiment
The local digitizer of the analog mutual inductor that the present invention proposes reaches embodiment in conjunction with the accompanying drawings and is described in detail as follows:
The local digitizer of the analog mutual inductor that the present invention proposes, it is characterized in that, comprise N small-sized progress of disease device, a N signal acquiring board and power supply three parts, wherein, described small-sized progress of disease device is used for converting the output signal of analog mutual inductor to can supply signal acquiring board to sample voltage signal, described signal acquiring board is used for sampled signal is carried out analog-to-digital conversion, error correction and opto-electronic conversion, and receives sample command and send sampled data by optical fiber; Described power supply is used to supply with the DC power supply of each collection plate work; The span of N is the positive integer of 1-6; The annexation of each several part is: the input of each small-sized progress of disease device links to each other with one road output of traditional electromagnetic transformer, the output of each small-sized progress of disease device links to each other with a signal acquiring board and constitutes one road signal processing unit, and N road signal processing unit all links to each other with described power supply.
Operation principle of the present invention:
The small-sized progress of disease device in each road is with the big electric current or big voltage analog signal (ampere or volt magnitude) the voltage signal process secondary progress of disease small voltage analog signal (millivolt magnitude) of traditional electromagnetic transformer output, this small voltage signal carries out analog-to-digital conversion by signal acquiring board, signal processing such as error correction and opto-electronic conversion converts digital optical signal to, each way word light signal after will handling at last receives sample command and sends sampled data to far-end combiner or secondary device by optical fiber, and the d. c. voltage signal that described power supply is carried transformer station converts the correspondent voltage signal to and offers each collection plate.
In actual applications, signal strength signal intensity is not enough during as if need length Distance Transmission, or photosignal is shared by a plurality of secondary devices, can increase a fibre optic repeater, and the two ends of this fibre optic repeater are connected between the output and optical fiber of each road signal acquiring board.
The local digitizer embodiment 1 of the analog mutual inductor that the present invention proposes, instrument transformer in the present embodiment is the traditional electromagnetic current transducer with 6 road current output signals, the local digitizer of present embodiment is formed structure as shown in Figure 1, comprise by 6 small current instrument transformers and 66 small-sized progress of disease devices that sampling resistor constitutes, 6 signal acquiring boards, a fibre optic repeater and power supply four parts, the annexation of each several part is: the input of each small-sized instrument transformer links to each other with one road output of conventional current instrument transformer, the output of each small-sized instrument transformer links to each other with a signal acquiring board by a sampling resistor R successively and constitutes one road signal processing unit, and 6 road signal processing units link to each other with described fibre optic repeater and power supply respectively.
The present embodiment device is positioned in the airtight outdoor rainproof cabinet, and cable is connected from end opening with optical cable and enters.
Formation and function thereof to every part is described in detail as follows below:
The small-sized progress of disease device of present embodiment is made up of as shown in Figure 1 small current instrument transformer and sampling resistor R.It is the small current instrument transformer product of 100mA that present embodiment adopts rated current, and its precision is 0.05 grade, model ZB1136.The small current instrument transformer is 100mA with the current conversion of the 5A/1A of traditional electromagnetic current transducer output, has adopted the small current instrument transformer, can guarantee the precision of system.The electric current of small current instrument transformer output is converted to voltage by sampling resistor (it is 5ppm that temperature is floated grade), sampling resistor select for use with small current instrument transformer output valve mutually the resistance product of suitable resistance get final product so that voltage range within analog-to-digital input range.
The fibre optic repeater of present embodiment adopts conventional product, gathers in order to the optical fiber input and output with every road, and the form with optical cable connects at last, realizes data communication.Reportedly outside the transmission function, optical fiber can also play electrical isolation and anti-interference effect as dielectric to divisor.
The power supply of present embodiment is formed structure as shown in Figure 2, comprise the duplicate supply modular converter that constitutes Hot Spare by two reference power supply conversions and two energy supply control modules (adopting the LTC4350 controller), and the 5V/ ± 15V power transfer module (LT3472), 5V/3.3V power transfer module (LT1716-3.3) and the 5V/1.2V power transfer module (LT1716-1.2) that link to each other with the duplicate supply module simultaneously.The 48V DC power supply that its input adopts transformer station to provide, two duplicate supply modular converters are converted to the 5V DC power supply with the 48V DC power supply, and support hot plug, power supply balance and the power down protection of power supply, can the raising system get reliability.The 5V input provides 3.3V/1.2V, ± 15V by power transfer module for the signal sampling plate again.Can guarantee that local digitizer can carry out reliable and stable operation.
Communication format is the method for synchronization between the combiner of present embodiment signal acquiring board and far-end, at first sends the synchronized sampling order by combiner, and signal acquiring board is finished sampling, data processing, by certain frame format sampled data is mail to combiner then.
The signal acquiring board of present embodiment comprises protective circuit, the signal condition module that links to each other successively, analog-to-digital conversion module, data processing module, optical-electrical converter, electrical to optical converter, and the temperature compensation module that links to each other with data processing module; The composition combination of each circuit is respectively described below as shown in Figure 3:
What the protective circuit of present embodiment adopted is anti-overshoot protection circuit, and the device of employing is the TVS pipe, i.e. transition suppresses diode, and this protective circuit is connected between small-sized instrument transformer and the sampling resistor R.
The signal condition module of present embodiment mainly adopts second order Basel low pass filter, it is formed as shown in Figure 4, constitute second-order low-pass filter by amplifier OP27 and coupled R1 and C1 and R2 and C2, the low pass filter of this type has delay time identical characteristics in passband.
The analog-to-digital conversion module of present embodiment adopts AD7663, and its resolution is 16, and this analog to digital converter is a digital signal with analog signal conversion;
The present embodiment electrical to optical converter adopts HFBR1414, optical-electrical converter to adopt HFBR2412, by the optical fiber interface ST head connection optical fiber of standard.
The temperature compensation module of present embodiment adopts ADT7302, compensates in order to the temperature that detects data processing module and to the digital quantity of its processing.
The data processing module of present embodiment adopts programmed logic device EP2C5, and in order to finish control analog-to-digital conversion, the compensation of temperature acquisition realization data and the control and the processing capacity of transfer of data, the concrete handling process of this programmed logic device comprises as shown in Figure 5:
1) system powers on, initialization;
2) wait for receiving synchronous information;
3) judge whether synchronizing information is correct, if then carry out the 4th) step, otherwise turn round the 2nd) step;
4) synchronizing information with simulation is converted into digital signal;
5) computing of digital quantity passing ratio is adjusted, adjusted to the standard output valve (according to IEC60044-7, IEC60044-8 standard, the digital quantity of rated primary current or voltage output at normal temperatures is 2D41H) of defined;
6) read temperature value, digital quantity is carried out temperature-compensating;
7) digital quantity of adjusting is packed, serial sends, and turns round the 2nd) step.
The local digitizer embodiment 2 of the analog mutual inductor that the present invention proposes, the composition structure of present embodiment is substantially the same manner as Example 1, the instrument transformer that different is in the present embodiment is the traditional electromagnetic potential transformer with 2 road voltage output signals, small-sized progress of disease device in the present embodiment directly adopts small-sized voltage transformer, its output variable is a voltage, therefore saved the sampling resistor R among the embodiment 1, also saved a fibre optic repeater in addition, the output of each signal acquiring board directly sends to every frame data by optical cable the combiner or the secondary device of far-end.
The small-sized voltage transformer of present embodiment (ZB2136,0.05 grade of precision) is 4V with the 100V/ voltage transitions of traditional electromagnetic potential transformer output.
Welding optic fibre, optical cable are come according to standardized work in the job site, connect signal input cable, connect power supply.And fix this device.
Claims (6)
1, a kind of local digitizer of analog mutual inductor, it is characterized in that, comprise N small-sized progress of disease device, a N signal acquiring board and power supply three parts, wherein, described small-sized progress of disease device is used for converting the output signal of analog mutual inductor to can supply signal acquiring board to sample voltage signal, described signal acquiring board is used for sampled signal is carried out analog-to-digital conversion, error correction and opto-electronic conversion, and receives sample command and send sampled data by optical fiber; Described power supply is used to supply with the DC power supply of each collection plate work; The span of N is the positive integer of 1-6; The annexation of each several part is: the input of each small-sized progress of disease device links to each other with one road output of traditional electromagnetic transformer, the output of each small-sized progress of disease device links to each other with a signal acquiring board and constitutes one road signal processing unit, and N road signal processing unit all links to each other with described power supply.
2, the local digitizer of analog mutual inductor as claimed in claim 1, it is characterized in that, described power supply comprises the duplicate supply modular converter that is made of Hot Spare the conversion of two reference power supplies and two energy supply control modules, and the 5V/ ± 15V power transfer module, 5V/3.3V power transfer module and the 5V/1.2V power transfer module that link to each other with the duplicate supply module of while.
3, the local digitizer of analog mutual inductor as claimed in claim 1; it is characterized in that; described signal acquiring board comprises protective circuit, the signal condition module that links to each other successively; analog-to-digital conversion module; data processing module, optical-electrical converter, electrical to optical converter, and the temperature compensation module that links to each other with data processing module.
As the local digitizer of claim 1,2 or 3 described analog mutual inductors, it is characterized in that 4, described small-sized progress of disease device is made of small current instrument transformer and sampling resistor.
As the local digitizer of claim 1,2 or 3 described analog mutual inductors, it is characterized in that 5, described small-sized progress of disease device is made of small-sized voltage transformer.
As the local digitizer of claim 1,2 or 3 described analog mutual inductors, it is characterized in that 6, also comprise a fibre optic repeater, this fibre optic repeater links to each other with the output of each road signal acquiring board.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200710062740 CN101030474A (en) | 2007-01-16 | 2007-01-16 | Local digitizer of analog mutual inductor |
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| CN 200710062740 CN101030474A (en) | 2007-01-16 | 2007-01-16 | Local digitizer of analog mutual inductor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510092A (en) * | 2011-12-19 | 2012-06-20 | 国网电力科学研究院 | Distributed real-time control unit of wind power converter |
| CN103063907A (en) * | 2012-12-26 | 2013-04-24 | 武汉烽火富华电气有限责任公司 | Electronic type voltage transformer signal collection system |
| CN103983284A (en) * | 2014-05-05 | 2014-08-13 | 广西电网公司电力科学研究院 | Distributed power transmission line OPGW state monitoring system based on -48V power supply |
| CN106896253A (en) * | 2017-03-13 | 2017-06-27 | 烟台东方威思顿电气有限公司 | A kind of pluggable Electrical Instrument Transducers with Digital makeup is put |
-
2007
- 2007-01-16 CN CN 200710062740 patent/CN101030474A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510092A (en) * | 2011-12-19 | 2012-06-20 | 国网电力科学研究院 | Distributed real-time control unit of wind power converter |
| CN103063907A (en) * | 2012-12-26 | 2013-04-24 | 武汉烽火富华电气有限责任公司 | Electronic type voltage transformer signal collection system |
| CN103063907B (en) * | 2012-12-26 | 2016-02-17 | 武汉烽火富华电气有限责任公司 | A kind of electronic type voltage transformer signal collection system |
| CN103983284A (en) * | 2014-05-05 | 2014-08-13 | 广西电网公司电力科学研究院 | Distributed power transmission line OPGW state monitoring system based on -48V power supply |
| CN106896253A (en) * | 2017-03-13 | 2017-06-27 | 烟台东方威思顿电气有限公司 | A kind of pluggable Electrical Instrument Transducers with Digital makeup is put |
| CN106896253B (en) * | 2017-03-13 | 2023-06-09 | 烟台东方威思顿电气有限公司 | Digital device of live plug-in electronic transformer |
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Effective date of registration: 20070831 Address after: Beijing Haidian District East Road No. 1 unit 1 building A room 01 yuan Applicant after: Beijing Hoti Photoelectric Technology Co., Ltd. Address before: Beijing city Haidian District East Road No. 1 Building 1 room 01 District A Applicant before: Wang Liangming Co-applicant before: Luo Chengmu Co-applicant before: Zhang Guixin |
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