CN202837375U - Electric current loop for voltage and current measuring signal transmission - Google Patents

Electric current loop for voltage and current measuring signal transmission Download PDF

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Publication number
CN202837375U
CN202837375U CN 201220518829 CN201220518829U CN202837375U CN 202837375 U CN202837375 U CN 202837375U CN 201220518829 CN201220518829 CN 201220518829 CN 201220518829 U CN201220518829 U CN 201220518829U CN 202837375 U CN202837375 U CN 202837375U
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China
Prior art keywords
current
voltage
signal
electric current
current loop
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Expired - Lifetime
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CN 201220518829
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Chinese (zh)
Inventor
韩玉玺
顾翼南
陈明洁
林中一
何剑平
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BEIJING CREATIVE DISTRIBUTION AUTOMATION Co Ltd
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BEIJING CREATIVE DISTRIBUTION AUTOMATION Co Ltd
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Priority to CN 201220518829 priority Critical patent/CN202837375U/en
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Publication of CN202837375U publication Critical patent/CN202837375U/en
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Abstract

The utility model relates to an electric current loop for voltage and current measured signal transmission. The electric current loop for the voltage and current measured signal transmission comprises a sensor for detecting electric quantity signals and a signal conditioning module connected with the sensor. The signal conditioning module conditions voltage signals and outputs the voltage signals to a signal conversion module. The voltage signals are converted into current signals through the signal conversion module and the current signals is output to a protection measuring module through a transmission wire. The electric current loop for transmission of the voltage and current measured signals is mainly used for signal transmission of an electronic type mutual inductor in an electric power system. The degree of current output by the electric current loop is the milliampere degree, and therefore electric power consumption is small and electric power supply is convenient. Precision of the electric current loop is decided by the resistance (R) so that design is simple. Transmission is in difference so that capability of common mode interference resistance is strong.

Description

A kind of electric current loop for the transmission of voltage and current measurement signal
Technical field
The utility model relates to a kind of electric current loop for voltage and current measurement signal transmission, relates in particular to a kind of electric current loop of the signal transmission for electronic mutual inductor.
Background technology
One of core of intelligent grid technology is the digital collection transmission process of electrical network electrical parameter.Traditional electrical network electrical parameter adopts mutual inductor of electromagnetic type to convert electric quantity signal to the low-pressure secondary signal, and then with the secondary mutual inductor signal is converted into weak electric signal with computer interface coupling, link is many, Heavy Weight, power consumption large, the metal material consumption is large, does not meet the requirement of national energy-saving environmental protection policy.Along with the intelligent grid technical development, adopt ePT, the eCT of divided voltage sensor, low-power current sensor, Rogowski coil current sensor, optical sensor and digitizer integrated design to be used widely, what these mutual inductors generally adopted is the low voltage signal way of output, this mode poor anti jamming capability, can not long-distance transmissions, need to use special-purpose shielded cable, cost is higher.
The utility model content
Technical problem to be solved in the utility model is to overcome the deficiency of above-mentioned prior art, a kind of problem that solves traditional small signal transmission mode poor anti jamming capability is provided, can be widely used in the electric current loop that is used for the transmission of voltage and current measurement signal of the equipment such as switch cubicle and on-pole switch.
A kind of main technical schemes that adopts for the electric current loop of voltage and current measurement signal transmission that provides according to the utility model is: comprise the sensor that detects electric quantity signal and the signal condition module that is connected with described sensor; described signal condition module is adjusted voltage signal and is exported signal conversion module to, and described voltage signal is converted to current signal through described signal conversion module and exports the protection module to by transfer wire.
The electric current loop that is used for voltage and current measurement that the utility model provides also can have following attached technical characterictic:
Described signal conversion module comprises operational amplifier N and the current sampling resistor Rf that is connected with described operational amplifier N, and operational amplifier N forms output current by described sample resistance Rf.
Described operational amplifier is connected with described protection module by a transfer wire, and described transfer wire exports described output current to described protection module.
Described transfer wire is twisted-pair feeder.
Described protection module comprises current transformer T and the sampling resistor Ri that is connected with described current transformer T, and described output current exports current transformer T to, and described sampling resistor Ri is converted to voltage signal with the current signal of current transformer T output.
The beneficial effect that the electric current loop that is used for voltage and current measurement that adopts the utility model to provide brings is: the output current of the utility model is a milliampere level, and power consumption is little, and power supply is convenient, simplicity of design; Differential transfer has very strong anti-common mode interference ability; Current transformer T has stronger electrical isolation ability, has further improved antijamming capability and security performance; Circuit is simple and practical, and is with low cost, and after tested, performance is much better than the like product that adopts the voltage signal transmission on the present market.
Description of drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is done further detailed description:
As shown in Figure 1; the embodiment of the electric current loop that is used for voltage and current measurement that provides according to the utility model; comprise the sensor 1 that detects electric quantity signal and the signal condition module 2 that is connected with described sensor 1; described signal condition module 2 is adjusted voltage signal and is exported signal conversion module 3 to; described voltage signal is converted to current signal through described signal conversion module 3 and exports protection module 5 to by transfer wire 4; the utility model is with practical divided voltage sensor in the transformer station; the low-power current sensor application is in on-pole switch equipment; adopt low cost current ring signal transmission, solved Chief Signal Boatswain line transmission anti-interference problem; signal attenuation affects precision problem and signal electrical isolation problem.
Referring to Fig. 1; the embodiment of the electric current loop that be used for to be used for the transmission of voltage and current measurement signal that provides according to the utility model; described signal conversion module 3 comprises operational amplifier N and the current sampling resistor Rf that is connected with described operational amplifier N; operational amplifier N forms output current by described sample resistance Rf; described operational amplifier N is connected with described protection module 5 by a transfer wire; described transfer wire 4 exports described output current to described protection module 5; after the voltage signal of electronic sensor 1 output is nursed one's health through signal conditioning circuit 2; export 1 ac voltage signal U to high gain operational amplifier N; operational amplifier N negative feedback loop forms and the linear directly proportional output current of input voltage Ui I; output current I=Ui/Rf, current signal enters protection device 5 through transfer wire 4.
Referring to Fig. 1, the embodiment of the electric current loop that is used for voltage and current measurement that provides according to the utility model, described transfer wire 4 is twisted-pair feeder, and the transfer wire that the utility model adopts is not limited to twisted-pair feeder, can also adopt other to have the other types wire of transmission output current function.
Referring to figure; 1; the embodiment of the electric current loop that is used for voltage and current measurement that provides according to the utility model; described protection module 5 comprises current transformer T and the sampling resistor Ri that is connected with described current transformer T; described output current exports current transformer T to; described sampling resistor Ri is converted to voltage signal with the current signal of current transformer T output; current signal enters the current transformer T of protection device inside through transfer wire 4; the no-load voltage ratio of this current transformer T is 1:1; because the A/D sampled signal of single-chip microcomputer requires to be voltage signal; need to be converted to voltage signal Uo by the current signal that sampling resistor Ri exports current transformer; Uo=Ui*Ri/Ff is directly proportional with the voltage signal Ui of input.
What transmit among the transfer wire L is current signal, and this signal is only relevant with input voltage Ui, irrelevant with the length of transfer wire 4, can remote undamped transmission.The current mode transmission belongs to differential mode, can resist various common mode interference, even differential mode interference as long as in the range of adjustment of amplifier, can be eliminated too.
The utlity model has output current and be a milliampere level, power consumption is little, and power supply is convenient; The size of output current is determined by sample resistance R, simplicity of design; Differential transfer has very strong anti-common mode interference ability; Current transformer T has stronger electrical isolation ability, has further improved antijamming capability and security performance; Circuit is simple and practical, and is with low cost, and after tested, performance is much better than the characteristics of the like product of voltage signal transmission on the present market.

Claims (5)

1. one kind is used for the electric current loop that the voltage and current measurement signal transmits; comprise the sensor of detectable voltage signals and the signal condition module that is connected with described sensor; it is characterized in that: described signal condition module is adjusted voltage signal and is outputed voltage signal to signal conversion module, and described voltage signal is converted to current signal through described signal conversion module and exports the protection module to by transfer wire.
2. the electric current loop for voltage and current measurement signal transmission according to claim 1, it is characterized in that: described signal conversion module comprises operational amplifier N and the current sampling resistor Rf that is connected with described operational amplifier N, and operational amplifier N forms output current by described sample resistance Rf.
3. the electric current loop for voltage and current measurement signal transmission according to claim 2; it is characterized in that: described operational amplifier is connected with described protection module by a transfer wire, and described transfer wire exports described output current to described protection module.
4. the electric current loop for voltage and current measurement signal transmission according to claim 3, it is characterized in that: described transfer wire is twisted-pair feeder.
5. the electric current loop for voltage and current measurement signal transmission according to claim 1; it is characterized in that: described protection module comprises current transformer T and the sampling resistor Ri that is connected with described current transformer T; described output current exports current transformer T to, and described sampling resistor Ri is converted to voltage signal with the current signal of current transformer T output.
CN 201220518829 2012-10-11 2012-10-11 Electric current loop for voltage and current measuring signal transmission Expired - Lifetime CN202837375U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220518829 CN202837375U (en) 2012-10-11 2012-10-11 Electric current loop for voltage and current measuring signal transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220518829 CN202837375U (en) 2012-10-11 2012-10-11 Electric current loop for voltage and current measuring signal transmission

Publications (1)

Publication Number Publication Date
CN202837375U true CN202837375U (en) 2013-03-27

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104655922A (en) * 2013-11-20 2015-05-27 江南大学 Vicious load judging system based on voltage and current sampling data
CN105242095A (en) * 2014-07-07 2016-01-13 德尔格医疗有限责任公司 Device and method for detecting electric potentials
CN106771543A (en) * 2016-12-29 2017-05-31 重庆金鑫智慧科技有限公司 A kind of fault diagnosis system based on current detecting
CN113739843A (en) * 2021-07-29 2021-12-03 武汉船用机械有限责任公司 State monitoring system and state monitoring method for electromagnetic pile hammer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104655922A (en) * 2013-11-20 2015-05-27 江南大学 Vicious load judging system based on voltage and current sampling data
CN105242095A (en) * 2014-07-07 2016-01-13 德尔格医疗有限责任公司 Device and method for detecting electric potentials
CN105242095B (en) * 2014-07-07 2019-02-15 德尔格制造股份两合公司 The device and method for detecting current potential
US10542900B2 (en) 2014-07-07 2020-01-28 Drägerwerk AG & Co. KGaA Device and method for detecting electric potentials
CN106771543A (en) * 2016-12-29 2017-05-31 重庆金鑫智慧科技有限公司 A kind of fault diagnosis system based on current detecting
CN113739843A (en) * 2021-07-29 2021-12-03 武汉船用机械有限责任公司 State monitoring system and state monitoring method for electromagnetic pile hammer

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Granted publication date: 20130327