CN205067587U - Digital electric current detection circuit of active high pressure - Google Patents
Digital electric current detection circuit of active high pressure Download PDFInfo
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- CN205067587U CN205067587U CN201520784991.7U CN201520784991U CN205067587U CN 205067587 U CN205067587 U CN 205067587U CN 201520784991 U CN201520784991 U CN 201520784991U CN 205067587 U CN205067587 U CN 205067587U
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Abstract
The utility model relates to a digital electric current detection circuit of active high pressure, it includes power supply circuit, signal detection transmitting circuit and signal reception end, power supply circuit, signal detection transmitting circuit are connected with the high -pressure side winding respectively, parallelly connected optic fibre of signal detection transmitting circuit output and RF port, signal detection transmitting circuit by mains operated, high -pressure side winding current signal processing that signal detection transmitting circuit will gather after optic fibre or the transmission of RF port are extremely signal reception end carries out signal contravariant conversion, changes target signal into through signal contravariant conversion terminal and supplies other secondary equipment to choose for use. The utility model discloses the anti -electromagnetic interference performance is better, guarantees the accuracy nature and the reliability of signal in strong electromagnetic environment, and small, light in weight, low cost, can be extensively uses in the current transformer field.
Description
Technical field
The utility model relates to a kind of current sense circuit, particularly about the active high pressure of one (operating voltage is greater than 10KV) digital current sensing circuit.
Background technology
At present, electronic current mutual inductor (CT) is for electromagnetic current transducer, and traditional current transformer is all that winding mode is manufactured centered by magnetic core, has exposed some deadly defects in high-voltage electrical apparatus applications:
1, Insulation Problems: the air insulation that conventional electromagnetic current transformer adopts, paper oil insulation, gas-insulated and tandem insulation all can not meet electric pressure to be increased increasingly, the requirement that cabinet or installation environment are day by day compact.
2, error problem: electromagnetic current transducer iron core-closed saturated by the aperiodic component effect of electric current, magnetoconductivity plunges and error is increased in transient process.
3, magnetic core is criticized and is shaken: what cause due to the saturation of current transformer inductance continues and amplitude resonance overvoltage.
4, due to the iron core of electromagnetic transformer, therefore range of dynamic measurement is limited.
5, cause that Keep Clear-High Voltage during electromagnetic transformer output terminal open circuit.
6, export as full quantitative information without no-load voltage ratio.
Also have weight large in addition, cost is high, easily produces interference; Not easily numeral connects, and oiliness insulation also has the risk of blast.Therefore, existing electromagnetic current transducer is difficult to the high-precision requirement meeting electric system on-line checkingi.
Summary of the invention
For the problems referred to above, the purpose of this utility model is to provide a kind of active high-voltage digital current sense circuit, and its electromagnetism interference better performances ensures accuracy and the reliability of signal in strong electromagnetic environment, and volume is little, lightweight, low cost.
For achieving the above object, the utility model takes following technical scheme: a kind of active high-voltage digital current sense circuit, is characterized in that: it comprises power circuit and input process transtation mission circuit; Described power circuit, input process transtation mission circuit respectively with high-pressure side winding switching, described input process transtation mission circuit output terminal parallel fiber optic and RF port, described input process transtation mission circuit is by described Power supply; Described input process transtation mission circuit comprises sample circuit, signal modulation circuit, algorithm circuit and output interface circuit; Described sample circuit completes low level signal amplification, for gathering high-pressure side winding current signal and transferring to described signal modulation circuit; Described signal modulation circuit is for modulating high-pressure side winding current signal and transferring to described algorithm circuit; Described algorithm circuit completes electric current and quantizes and transfer to described output interface circuit, converts quantification current signal to light signal by described output interface circuit.
Further, described power circuit is made up of easy saturable core coil and current collecting circuit.
Further, described active high-voltage digital current sense circuit also comprises signal receiving end, described input process transtation mission circuit, by after the high-pressure side winding current signal process that collects, exports after described signal receiving end carries out signal inversion conversion through described optical fiber or RF port transmission.
The utility model is owing to taking above technical scheme, it has the following advantages: 1, the utility model is with Digital output, simplify the interface of mutual inductor and secondary device, avoid the additive error of signal in transmission, storage and process, improve system reliability.2, digital signal of the present utility model is outwards transmitted by optical fiber or radio frequency form, and electromagnetism interference performance is good, ensures accuracy and the reliability of signal in strong electromagnetic environment.3, the utility model is pure electronic circuit, iron-core-free, and there is not magnetic saturation, ferroresonance phenomenon, the linearity is good, and insulation is simple, and range of dynamic measurement is large, bandwidth, precision are high.And volume is little, lightweight, low cost, reduces the area of transformer station.4, between double measurement circuit of the present utility model (i.e. input process transtation mission circuit) and testing circuit (i.e. signal receiving end), transmission channel adopts radio frequency or optical fiber, insulate reliably with high-pressure side, insulating medium between input process transtation mission circuit and signal receiving end is fiber termination box air, therefore does not have high pressure electric leakage to cause the danger of personal safety accident.5, the utility model electronic current mutual inductor has adapted to the trend of electric-power metering and protection digitizing, Microcomputer and automation development.
The utility model can extensively be applied in current transformer field.Other feature and advantage of the present utility model will be set forth in the following description, and partial information reading instructions is more apparent.
Accompanying drawing explanation
Accompanying drawing only for illustrating the object of specific embodiment, and is not thought restriction of the present utility model.
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
Be described in detail the utility model below in conjunction with drawings and Examples, accompanying drawing forms the application's part, and is used from explaination the utility model with embodiment one of the present utility model.But those skilled in the art it will be appreciated that; following examples are not the unique restriction done technical solutions of the utility model; every any equivalents of doing under technical solutions of the utility model Spirit Essence or change, all should be considered as belonging to protection domain of the present utility model.
As shown in Figure 1, the utility model provides a kind of active high-voltage digital current sense circuit, and it comprises power circuit, input process transtation mission circuit and signal receiving end; Power circuit, input process transtation mission circuit respectively with high-pressure side winding switching, input process transtation mission circuit output terminal parallel fiber optic and RF port, input process transtation mission circuit is by Power supply.Input process transtation mission circuit by after bus (i.e. high-pressure side winding) the current signal process that collects through optical fiber or RF port transmission to signal receiving end, carry out signal inversion conversion, change into echo signal through signal inversion switch endpoint and select for other secondary device.Wherein, optical fiber is the medium connecting secondary high-voltage circuit and the information of reception end, and optical fiber has neither part nor lot in the sampling to electric current, therefore, current sense circuit of the present utility model is actually Optical Fiber Transmission, current sampling circuit, the assembly of power supply processing circuit, belongs to non-functional optic fiber sensor.
In above-described embodiment, input process transtation mission circuit comprises sample circuit, signal modulation circuit, algorithm circuit and output interface circuit.Sample circuit completes low level signal amplification, for gathering bus (i.e. high-pressure side winding) current signal and transferring to signal modulation circuit; Signal modulation circuit is for modulating bus current signal and transferring to algorithm circuit; Algorithm circuit completes electric current and quantizes and transfer to output interface circuit, converts quantification current signal to light signal by output interface circuit.Wherein, the quantizing process of algorithm circuit is the calculating of non-register, but uses digital circuit to complete calculating.
In above-described embodiment, power circuit is made up of easy saturable core coil and current collecting circuit, can effectively overcome in prior art like this: when primary current is large, supply voltage is high, easily burns out; Primary current hour power supply exports and is not enough to drive the problems such as other circuit working.Be arranged on high-pressure side due to signal modulation circuit and gather bus current, insert space has powerful electromagnetic radiation, and these radiation produce stronger electromagnetic interference (EMI) by sample circuit, therefore the power supply supply of sample circuit and job stability very important.The utility model adopts special small current mutual inductor to get primary current energy, and during power circuit work, primary current can reach 20A-200kA wide, and high electric current does not burn out, and can power during low circuit; And distinctive anti-voltage and current surge damaged circuit are taked in power circuit inside.
The various embodiments described above are only for illustration of the utility model; the structure of each parts, size, setting position and shape all can change to some extent; on the basis of technical solutions of the utility model; all improvement of carrying out individual part according to the utility model principle and equivalents, all should not get rid of outside protection domain of the present utility model.
Claims (3)
1. an active high-voltage digital current sense circuit, is characterized in that: it comprises power circuit and input process transtation mission circuit; Described power circuit, input process transtation mission circuit respectively with high-pressure side winding switching, described input process transtation mission circuit output terminal parallel fiber optic and RF port, described input process transtation mission circuit is by described Power supply;
Described input process transtation mission circuit comprises sample circuit, signal modulation circuit, algorithm circuit and output interface circuit; Described sample circuit completes low level signal amplification, for gathering high-pressure side winding current signal and transferring to described signal modulation circuit; Described signal modulation circuit is for modulating high-pressure side winding current signal and transferring to described algorithm circuit; Described algorithm circuit completes electric current and quantizes and transfer to described output interface circuit, converts quantification current signal to light signal by described output interface circuit.
2. active high-voltage digital current sense circuit as claimed in claim 1, is characterized in that: described power circuit is made up of easy saturable core coil and current collecting circuit.
3. active high-voltage digital current sense circuit as claimed in claim 2, it is characterized in that: described active high-voltage digital current sense circuit also comprises signal receiving end, described input process transtation mission circuit, by after the high-pressure side winding current signal process that collects, exports after described signal receiving end carries out signal inversion conversion through described optical fiber or RF port transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520784991.7U CN205067587U (en) | 2015-10-10 | 2015-10-10 | Digital electric current detection circuit of active high pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520784991.7U CN205067587U (en) | 2015-10-10 | 2015-10-10 | Digital electric current detection circuit of active high pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205067587U true CN205067587U (en) | 2016-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520784991.7U Active CN205067587U (en) | 2015-10-10 | 2015-10-10 | Digital electric current detection circuit of active high pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205067587U (en) |
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2015
- 2015-10-10 CN CN201520784991.7U patent/CN205067587U/en active Active
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