CN101354825A - Method and apparatus for measuring wireless ultra-high pressure current - Google Patents
Method and apparatus for measuring wireless ultra-high pressure current Download PDFInfo
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- CN101354825A CN101354825A CNA2007100183680A CN200710018368A CN101354825A CN 101354825 A CN101354825 A CN 101354825A CN A2007100183680 A CNA2007100183680 A CN A2007100183680A CN 200710018368 A CN200710018368 A CN 200710018368A CN 101354825 A CN101354825 A CN 101354825A
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Abstract
The invention discloses a method and a device for measuring wireless ultra-high voltage current. A measurement signal of the current of a high voltage line is obtained through a current sensor at a high potential side and is output through an effective value processing circuit and an analog-to-digital conversion circuit, and the acquisition and the wireless transmitting of the measurement signal are controlled by a computer at the high potential side. The signal is received through a radio receiving device at a low potential side, is processed by a computer at the low potential side, and then is output. The method and the device solve technical problems of large volume, heavy weight, high cost, and relatively poor operational accuracy and stability. The device has the advantages of flexible control and transmission, convenient use, simple structure, and simple and convenient installation; and the method and the device have wide range of frequency response, can measure the transient state of the current of a power grid and the high-frequency haevy current, and comply with the development demands of electric power measurement as well as relay protection automation and computerization.
Description
Technical field
The present invention relates to a kind of current measuring method and device of ehv power transmission circuit, relate in particular to a kind of wireless ultra-high pressure current measuring method and device.
Background technology
Along with the rising of voltage class of electric power system and the continuous increase of transmission capacity, the shortcoming of traditional extra-high voltage flow measuring apparatus is more and more outstanding.
Traditional current transformer is induction current transformer (CT), and its winding is the power circuit cable, and the Secondary Winding external circuit is connected to surveying instrument or relay protection and automaton.Structure is similar with transformer, is wound with first and second winding on its iron core, and the electromagnetic coupled by between first and second winding passes to secondary side with information from primary side.Between iron core and winding, and the insulation system that enough electric strengths are arranged between first and second winding, isolated to guarantee all low-voltage equipments and high voltage.It has the measuring accuracy height current transformer, and commercial Application has reached 0.2%, and can be in the medium-term and long-term stable operation of electric system.But be coupled by iron core between the high voltage bus of induction current transformer and the secondary coil, insulation system complexity between them, bulky, Heavy Weight, the extra-high voltage flow measuring apparatus that has even several tons of weights are arranged, not only make difficulty, use, difficulty is installed, floor area is big, and cost an arm and a leg, cost is index with electric pressure and rises, conventional oil-immersed current transformer, and the product of 500kV exceeds one times than the product price of 300kV.The 5A of induction current transformer or 1A output must adopt the light isolation technology to be connected with computing machine, control, transmission inconvenience.In addition, induction current transformer has iron core, has non-linearly, and when electric system was short-circuited, the short-circuit current of high amplitude made mutual inductor saturated, and the secondary current of output seriously distorts, and causes the protection changing of the relative positions, makes electric system generation major accident.And, the saturated wave form distortion that causes of mutual inductor, its frequency response characteristic is poor, and frequency band is narrow, system high-frequency difference in response, the realization difficulty that makes novel quick protection based on the high frequency transient component.The secondary circuit of induction current transformer can not be opened a way, and low-pressure side exists open circuit dangerous.The way that induction current transformer generally adopts insulating oil to isolate solves Insulation Problems, has danger such as inflammable, explosive inevitably.
Photo-electric current transformer (OCT) kind is more, roughly is divided into two kinds of active type and passives.Its sensing head of active type partly has the electronic circuit that needs with power supply, and its sensing head part of passive does not need power supply, and both have the advantage of traditional electromagnetic current transducer.Active type photo-electric current transformer is a newly-developed, and structure is simpler relatively.Adopt LASER Light Source, luminous energy is delivered to hot side from the earth potential side by optical fiber, by electrooptical device transform light energy is become electric energy again, behind the power supply stabilizing circuit, give the power electronics of sensing head.All adopt electron device in the sensing head of its hot side.Hot side becomes bus current into analog voltage signal with air core coil (Rogowski coil), convert digital signal to through analog to digital conversion circuit (A/D), convert light signal again to electric light conversion (LED) circuit, by the optical fiber of insulation light signal is delivered to the earth potential side then.In the earth potential side, (PIN) is converted to digital electric signal with light signal by electrooptical device, for the usefulness of relay protection and electric energy metrical.Needing the occasion of analog quantity, available D/A converting circuit (D/A) is converted to analog quantity with digital quantity.But the photo-electric current transformer influences because of the birefringence that optical material is caused by temperature, vibration etc., and running precision is relative with long-time stability relatively poor.Also be not applied at present the photo-electric current transformer on the above supertension line of 1000KV.
Summary of the invention
The object of the present invention is to provide a kind of wireless ultra-high pressure current measuring method and device, it has solved, and existing in prior technology is bulky, Heavy Weight, cost an arm and a leg, or the precision of operation and stable relative relatively poor technical matters.
Technical scheme of the present invention is:
A kind of wireless ultra-high pressure current measuring method, its special character are that the performing step of this method comprises:
(I) measuring the high-tension line electric current at hot side also launches with the radio signal mode:
(i) obtain the measuring-signal of high-tension line electric current by current sensor;
(ii) the measuring-signal of high-tension line electric current becomes the hot side analog current signal after signal Processing such as rectification, filtering, amplification;
(iii) the hot side analog current signal is converted to hot side digital current signal after analog-to-digital conversion process;
The (iv) emission of the measuring-signal of collection by hot side computer control hot side measuring-signal and hot side; The measuring-signal of the hot side of hot side computing machine output is converted to radiodigital galvanic current signal and launches through the radio conversion emitter;
(II) receive the high-tension line measuring-signal at the earth potential side joint:
(i) receive the radiodigital galvanic current signal that hot side is launched by radio system;
(ii) the radiodigital galvanic current signal that receives is exported after by earth potential side Computer Processing.
The radiodigital galvanic current signal of above-mentioned reception by earth potential side Computer Processing after output be directly to export digital signal, or with the radiodigital galvanic current signal that received by earth potential side Computer Processing after output be meant through D/A converting circuit is converted to simulating signal after and export again.
Above-mentioned steps (I) also comprises obtains the power supply that hot side is measured emitter; Obtaining hot side measures the step of emitter power supply and comprises: at first by current transformer by drawing power supply in the high-tension line, after rectification, filtering, the voltage stabilizing of power supply signal treatment circuit are handled, obtain the power supply that hot side is measured emitter then.
The above-mentioned step of obtaining hot side measurement emitter power supply also comprises: come the balance hot side to measure the supply voltage of emitter by the rechargeable battery in parallel with the power supply signal treatment circuit.When the high-tension line electric current is low, can measure the emitter power supply with rechargeable battery to hot side by balance.
A kind of wireless ultra-high pressure current measurement mechanism, comprise the hot side device, hot side power supply 2 and earth potential side device, its special character is: described hot side device is that hot side is measured emitter 1, described hot side is measured emitter 1 and is comprised the current sensor 101 that is series in the high-tension line or is arranged at the high-tension line outside, be connected to the effective value treatment circuit 102 of current sensor 101 output terminals, be connected to the analog to digital conversion circuit 103 of effective value treatment circuit 102 output terminals, be connected to the hot side computing machine 104 of analog to digital conversion circuit 103 output terminals, be connected to the radio conversion emitter 105 of hot side computing machine 104 output terminals; Described earth potential side device is an earth potential side joint receiving apparatus 3, described earth potential side joint receiving apparatus 3 comprises the radio system 301 that receives radio conversion emitter 105 signals, is connected to the earth potential side computing machine 302 of radio system 301 output terminals; The described effective value treatment circuit 102 that is connected to current sensor 101 output terminals comprises rectification circuit, filtering circuit and amplification treatment circuit.
Above-mentioned hot side power supply 2 comprises the current transformer 201 that is connected with high-tension line, is connected to the power supply signal treatment circuit 202 of current transformer 201 output terminals; Described power supply signal treatment circuit 202 comprises rectification circuit, filtering circuit and mu balanced circuit.
Above-mentioned power supply signal treatment circuit 202 also can balance supply voltage in parallel rechargeable battery 203.
Above-mentioned hot side computing machine 104 and earth potential side computing machine 302 can adopt single-chip microcomputer or data signal processor DSP etc.
The output terminal of above-mentioned earth potential side computing machine 302 can be connected to RS-232 output port, RS-485 output port or D/A converting circuit 303.
The present invention has following advantage:
(1) the stable state accuracy height of Ce Lianging.The present invention utilizes electromagnetic current transducer to measure, thus can obtain higher measuring accuracy, and can be in electric system midium or long term stable operation.
(2) since hot side and earth potential side signal be transmitted as radio transmission, receive mode, do not have tangible physics to link to each other, high-pressure side and ground form nature and insulate, so have saved huge high-voltage insulating system, the reliability height of insulation is safe in utilization.
(3) simple in structure, volume is little, and is in light weight, use, transportation, simple installation, and cost is low.The on high-tension side weight of the present invention is generally less than 1 kilogram, and is 5.3 meters with the oil-immersed current transformer height of electric pressure, 2300 kilograms of weight.
(4) hot side does not have tangible physics to link to each other with the earth potential side, has the good insulation performance performance, can guarantee that high tension loop and secondary circuit isolate on electric fully, and the earth potential side does not have open circuit, and Keep Clear-High Voltage, and antijamming capability is strong.
(5) frequency response range of the present invention is wide, can measure the harmonic wave on the high-voltage power line, also can carry out the measurement of power network current transient state and big electric current of high frequency and direct current.
(6) technology such as the insulation on colleeting comb digitized measurement of the present invention, Radio Data-transmission, supertension line stealing, high-tension line and ground and the output of many interfaces are one, control, transmission are flexibly, conveniently, measurement is irrelevant with electric pressure, has complied with the growth requirement of electric-power metering and relay robotization, microcomputerization.
Description of drawings
Fig. 1 measures the structural principle block diagram of emitter for hot side of the present invention.
Fig. 2 is the structural principle block diagram of earth potential side joint receiving apparatus of the present invention.
The explanation of accompanying drawing drawing: the 1-hot side is measured emitter, 101-current sensor, 102-effective value treatment circuit, 103-analog to digital conversion circuit, 104-hot side computing machine, 105-radio conversion emitter; 2-hot side power supply, 201-current transformer, 202-power supply signal treatment circuit, 203-rechargeable battery; 3-earth potential side joint receiving apparatus, 301-radio system, 302-earth potential side computing machine, 303-D/A converting circuit.
Embodiment
Wireless ultra-high pressure current measuring method performing step of the present invention is as follows:
(1.) measuring the high-tension line electric current at hot side also launches with the radio signal mode:
(1.1), obtain the measuring-signal of the electric current of high-tension line bus by current with high accuracy sensor 101 at hot side.Referring to Fig. 1.
(1.2) measuring-signal of high-tension line electric current after signal Processing such as 102 rectifications of effective value treatment circuit, filtering, amplification, is converted to the hot side analog current signal.
(1.3) the hot side analog current signal is converted to hot side digital current signal after analog-to-digital conversion process.
(1.4) hot side digital current signal input hot side computing machine 104, control the collection of the measuring-signal of hot sides by hot side computing machine 104.
(1.5) measuring-signal of the hot side of hot side computing machine 104 output is converted to radio signal and launches through radio conversion emitter 105.The emission of the measuring-signal of hot side computing machine 104 may command hot sides.The insulation of hot side and earth potential side is open space, does not have tangible physics to link to each other, and is a kind of insulation naturally.
(2.) hot side is measured the power supply of emitter:
At first by current transformer 201 by drawing high-tension electricity in the high-tension line, then through signal Processing such as 202 rectifications of power supply signal treatment circuit, filtering, voltage stabilizings, promptly obtain the power supply that hot side is measured emitter.The rechargeable battery 203 in parallel with power supply signal treatment circuit 202 is used for the supply voltage that the balance hot side is measured emitter.When not having electric current in circuit, rechargeable battery 203 can also be measured emitter 1 power supply to hot side.
(3.) receive the high-tension line measuring-signal at the earth potential side joint:
In the earth potential side, radio system 301 receives radiodigital galvanic current signal, referring to Fig. 2, directly exports digital signal after earth potential side computing machine 302 is handled, for the usefulness of relay protection and electric energy metrical; Or the digital signal of earth potential side computing machine 302 output is converted to simulating signal output through D/A converting circuit, convert electric current, the voltage signal of need of work again to.
Wireless ultra-high pressure current measurement mechanism of the present invention is mainly measured emitter 1, hot side power supply 2 and earth potential side joint receiving apparatus 3 by hot side and is constituted.
Referring to Fig. 1, the current sensor 101 that hot side is measured emitter 1 is series in the high-tension line, or is arranged at the outside of the bus of high-tension line.The output of current sensor 101 inserts effective value treatment circuit 102, and the output of effective value treatment circuit 102 inserts hot side computing machine 104 through analog to digital conversion circuit 103.Hot side computing machine 104 can adopt single-chip microcomputer or data signal processor DSP etc.The output of hot side computing machine 104 is converted to radio signal and launches through radio conversion emitter 105.
Hot side power supply 2 comprise with high-tension line in the current transformer 201 that is connected, its output inserts power supply signal treatment circuit 202.Power supply signal treatment circuit 202 can be parallel with the rechargeable battery 203 of balance supply voltage.
Referring to Fig. 2, earth potential side joint receiving apparatus 3, the output of itself and radio conversion emitter 105 corresponding radio systems 301 inserts earth potential side computing machine 302, and the output of earth potential side computing machine 302 is through having RS-232, RS-485 output port or D/A converting circuit 303 outputs.
Hot side computing machine 104 of the present invention and earth potential side computing machine 302 can adopt single-chip microcomputer or data signal processor DSP etc.
Claims (9)
1. a wireless ultra-high pressure current measuring method is characterized in that, the performing step of this method comprises:
(I) measuring the high-tension line electric current at hot side also launches with the radio signal mode:
(i) obtain the measuring-signal of high-tension line electric current by current sensor;
(ii) the measuring-signal of high-tension line electric current after comprising that rectification, filtering, amplifying signal are handled, becomes the hot side analog current signal;
(iii) the hot side analog current signal is converted to hot side digital current signal after analog-to-digital conversion process;
The (iv) emission of the measuring-signal of the collection of the measuring-signal by hot side computer control hot side and hot side; The measuring-signal of the hot side of hot side computing machine output is converted to radiodigital galvanic current signal and launches through the radio conversion emitter;
(II) receive the high-tension line measuring-signal at the earth potential side joint:
(i) receive the radiodigital galvanic current signal that hot side is launched by radio system;
(ii) the radiodigital galvanic current signal that receives is exported after by earth potential side Computer Processing.
2. wireless ultra-high pressure current measuring method according to claim 1, it is characterized in that, the radiodigital galvanic current signal of described reception by earth potential side Computer Processing after output be directly to export digital signal, or the radiodigital galvanic current signal of described reception by earth potential side Computer Processing after output be meant through D/A converting circuit is converted to simulating signal after again and export.
3. wireless ultra-high pressure current measuring method according to claim 1 and 2 is characterized in that, measuring the high-tension line signal and launch at hot side in the described step (I) also comprises and obtain the power supply that hot side is measured emitter; The described hot side that obtains is measured the step of emitter power supply and is comprised: at first by current transformer by drawing power supply in the high-tension line, after rectification, filtering, the voltage stabilizing of power supply signal treatment circuit are handled, obtain the power supply that hot side is measured emitter then.
4. wireless ultra-high pressure current measuring method according to claim 3, it is characterized in that the described step of obtaining hot side measurement emitter power supply comprises: come the balance hot side to measure the supply voltage of emitter by the rechargeable battery in parallel with the power supply signal treatment circuit.
5. device of realizing the described wireless ultra-high pressure current measuring method of claim 1, comprise the hot side device, hot side power supply (2) and earth potential side device, it is characterized in that: described hot side device is that hot side is measured emitter (1), described hot side is measured emitter (1) and is comprised the current sensor (101) that is series in the high-tension line or is arranged at the high-tension line outside, be connected to the effective value treatment circuit (102) of current sensor (101) output terminal, be connected to the analog to digital conversion circuit (103) of effective value treatment circuit (102) output terminal, be connected to the hot side computing machine (104) of analog to digital conversion circuit (103) output terminal, be connected to the radio conversion emitter (105) of hot side computing machine (104) output terminal; Described earth potential side device is an earth potential side joint receiving apparatus (3), described earth potential side joint receiving apparatus (3) comprises the radio system (301) that receives radio conversion emitter (105) signal, is connected to the earth potential side computing machine (302) of radio system (301) output terminal; The described effective value treatment circuit (102) that is connected to current sensor (101) output terminal comprises rectification circuit, filtering circuit and amplification treatment circuit.
6. wireless ultra-high pressure current measurement mechanism according to claim 5, it is characterized in that: described hot side power supply (2) comprises the current transformer (201) that is connected with high-tension line, is connected to the power supply signal treatment circuit (202) of current transformer (201) output terminal; Described power supply signal treatment circuit (202) comprises rectification circuit, filtering circuit and mu balanced circuit.
7. according to claim 5 or 6 described wireless ultra-high pressure current measurement mechanisms, it is characterized in that: described power supply signal treatment circuit (202) is parallel with the rechargeable battery (203) of balance supply voltage.
8. wireless ultra-high pressure current measurement mechanism according to claim 7 is characterized in that: described hot side computing machine (104) and earth potential side computing machine (302) are single-chip microcomputer or data signal processor DSP.
9. wireless ultra-high pressure current measurement mechanism according to claim 8 is characterized in that: the output terminal of described earth potential side computing machine (302) is connected to RS-232 output port, RS-485 output port or D/A converting circuit (303).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100183680A CN101354825A (en) | 2007-07-27 | 2007-07-27 | Method and apparatus for measuring wireless ultra-high pressure current |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100183680A CN101354825A (en) | 2007-07-27 | 2007-07-27 | Method and apparatus for measuring wireless ultra-high pressure current |
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| CN101354825A true CN101354825A (en) | 2009-01-28 |
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| CNA2007100183680A Pending CN101354825A (en) | 2007-07-27 | 2007-07-27 | Method and apparatus for measuring wireless ultra-high pressure current |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102568175A (en) * | 2010-12-28 | 2012-07-11 | 苏州华电电气股份有限公司 | Wireless transmission device of high-voltage measuring signal |
| CN102830295A (en) * | 2011-06-15 | 2012-12-19 | 上海电力通信有限公司 | Detecting system and detecting method of digital transformer substation protecting loop |
| CN104981708A (en) * | 2013-02-06 | 2015-10-14 | 阿尔斯通技术有限公司 | Device for signal processing in an electrical installation |
| CN105242144A (en) * | 2015-10-23 | 2016-01-13 | 安徽师范大学 | Power transmission circuit current state on-line monitoring system and method |
| CN105527480A (en) * | 2014-10-17 | 2016-04-27 | 日置电机株式会社 | Voltage detecting apparatus |
| CN105699751A (en) * | 2016-02-05 | 2016-06-22 | 刘万更 | Current collecting device |
-
2007
- 2007-07-27 CN CNA2007100183680A patent/CN101354825A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102568175A (en) * | 2010-12-28 | 2012-07-11 | 苏州华电电气股份有限公司 | Wireless transmission device of high-voltage measuring signal |
| CN102830295A (en) * | 2011-06-15 | 2012-12-19 | 上海电力通信有限公司 | Detecting system and detecting method of digital transformer substation protecting loop |
| CN102830295B (en) * | 2011-06-15 | 2014-12-31 | 上海电力通信有限公司 | Detecting system and detecting method of digital transformer substation protecting loop |
| CN104981708A (en) * | 2013-02-06 | 2015-10-14 | 阿尔斯通技术有限公司 | Device for signal processing in an electrical installation |
| CN104981708B (en) * | 2013-02-06 | 2017-11-14 | 通用电气技术有限公司 | For the processor device handled the signal in electric power facility |
| CN105527480A (en) * | 2014-10-17 | 2016-04-27 | 日置电机株式会社 | Voltage detecting apparatus |
| CN105527480B (en) * | 2014-10-17 | 2019-09-17 | 日置电机株式会社 | Voltage check device |
| CN105242144A (en) * | 2015-10-23 | 2016-01-13 | 安徽师范大学 | Power transmission circuit current state on-line monitoring system and method |
| CN105699751A (en) * | 2016-02-05 | 2016-06-22 | 刘万更 | Current collecting device |
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Open date: 20090128 |