CN204389585U - A kind of big current intelligent integral detector based on Luo-coil - Google Patents
A kind of big current intelligent integral detector based on Luo-coil Download PDFInfo
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- CN204389585U CN204389585U CN201420669345.1U CN201420669345U CN204389585U CN 204389585 U CN204389585 U CN 204389585U CN 201420669345 U CN201420669345 U CN 201420669345U CN 204389585 U CN204389585 U CN 204389585U
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- luo
- coil
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- chip microcomputer
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Abstract
The utility model is a kind of big current intelligent integral detector based on Luo-coil, it is characterized in that it is made up of modules such as Luo-coil current acquisition, A/D change-over circuit, single-chip microcomputer, relay bound warning circuit, 4-20mA analog output circuit, RS485 serial interface circuit, keyboard and digital-scroll technique circuit.The utility model adopts Luo-coil current acquisition system, can measure the alternating current within rated current 10A-10KA, without the need to another distribution current transformer; The data such as the current effective value of measured conductor and running status can be communicated with host computer, thus form the automatic measuring system of the several functions required for user with computing machine and other instrument easily, carry out more complicated test assignment, for grid automation controls to lay a good foundation.
Description
Technical field
The utility model relates to electrical measuring instrument field of instrumentation technology, particularly relates to a kind of big current intelligent integral detector based on Luo-coil.
Background technology
Power industry occupies important position in national economy, and power transmission and transforming equipment is the important component part of power equipment, and the electric energy that power station sends only has and just can be transported to each user by power transmission and transforming equipment.Important step in transmission line of electricity to the measurement of power network line electric current and control, it be electrical network to power transmission and distribution automation direction develop most basic, be also one of most important equipment.Along with modern power network is to the development in Large Copacity, high voltage, auto-control direction, current measure device is proposed: miniaturization, high reliability, measurement range are wide, bandwidth, good linearity, the requirement that high-low pressure is completely isolated, requires that data are transmitted simultaneously and becomes digitizing.Traditional technology gathers primary current owing to adopting traditional induction current transformer (exporting 5A or 1A), there is a lot of shortcoming: need large power input, power attenuation is large, and volume is large; Heavy and expensive; When short-circuit current is excessive, cause current transformer core saturated and current signal is distorted, therefore needing the protective device of complexity and costliness by the signal correction of distortion to its original shape; When open circuit appears in secondary, produce in secondary coil and can reach thousands of induction electromotive force to volt up to ten thousand, have very large danger to the equipment in operating personnel and secondary circuit.Based on above-mentioned shortcoming, be not suitable with and continued to use it in intelligent High-Voltage Electrical Appliances and instrument in modern power network.
Summary of the invention
The purpose of this utility model is intended to the drawback gathering primary current for solving traditional induction current transformer, and provides a kind of big current intelligent integral detector based on Luo-coil.
The utility model for achieving the above object, a kind of big current intelligent integral detector based on Luo-coil, it is characterized in that, comprise Luo-coil current acquisition, A/D change-over circuit, single-chip microcomputer, relay bound warning circuit, 4-20mA analog output circuit, RS485 serial interface circuit, keyboard and digital-scroll technique circuit module, the output of described Luo-coil current acquisition is connected with described A/D change-over circuit, the output of described A/D change-over circuit is connected with described single-chip microcomputer, the output of described single-chip microcomputer and described relay bound warning circuit, 4-20mA analog output circuit, RS485 serial interface circuit, digital-scroll technique circuit connects, the output of described keyboard is connected with described single-chip microcomputer.
Described Luo-coil, soft plastic rod is wound around multi-turn enameled wire curl equably, evenly turns to screen layer in the outside of coil by conducting metal strip, and form omnidirectional winding with coil, and outermost layer adopts plastic cement as insulating protective layer.Become closed hoop when coil uses, its joint is designed to plug-in type, and patching two ends is bayonet shape, and fixing with ambroin cover respectively, the copper sheathing of the built-in opening of its joint chair makes screen layer, and screen layer is by the extraction earthing potential that goes between.
The beneficial effects of the utility model are: the utility model technology is owing to have employed Luo-coil current acquisition system, it does not have ferromagnetic saturated, therefore transmission frequency bandwidth, measurement range is wide, good linearity, only 0.1-5VA, size are little, lightweight to have excellent interference free performance, its secondary capacity; Simultaneously with the combination of Single Chip Microcomputer (SCM) system, achieve the digitized transmission of current signal, make the robotization of power grid control, networking becomes a reality.The utility model adopts Luo-coil current acquisition system, can measure the alternating current within rated current 10A-10KA, without the need to another distribution current transformer (referring to the mutual inductor exporting 5A); Without the danger of second open circuit; The current effective value of measured conductor is directly shown by digitron display screen; Have upper and lower limit electric current warning function, its ultimate value user adjusts as required; There is fault self-diagnosis and trouble and managing function; Combination with single-chip microcomputer and digital circuit, achieves the automatic zero set (AZS) of instrument, automatic calibration function easily, improves measuring accuracy.Current value so changes in large scope at 10A-10KA, and its measuring accuracy can reach 1%; Based on RS485 interface, meet the bus communication function of Modbus communication protocol, the data such as the current effective value of measured conductor and running status can be communicated with host computer, thus form the automatic measuring system of the several functions required for user with computing machine and other instrument easily, carry out more complicated test assignment, for grid automation controls to lay a good foundation.
Accompanying drawing explanation
Fig. 1 is the theory diagram of a kind of big current intelligent integral detector based on Luo-coil of the utility model;
Be described in detail with reference to accompanying drawing below with reference to embodiment of the present utility model.
Embodiment
Embodiment 1 one kinds is based on the big current intelligent integral detector of Luo-coil.
As shown in Figure 1, a kind of big current intelligent integral detector based on Luo-coil of the utility model, Luo-coil model calling A/D change-over circuit module, A/D change-over circuit model calling one-chip computer module.One-chip computer module connects relay bound warning circuit module, 4-20mA analog output circuit module, RS485 serial interface circuit module, keyboard and digital-scroll technique circuit module respectively.
Described A/D circuit design contains a programmable-gain amplifier, two △ ∑ modulators, two highpass filters, and system calibration and electric current, instantaneous voltage are measured and the computing function of effective value.Conveniently with cpu communication, this circuit further comprises a simple 3-line serial interface circuit.
Described intelligent display meter is the CPU process of current signal through inside that Luo-coil current acquisition system is sampled truly can reflect primary current effective value by display screen, simultaneously outputting standard 4-20mA current signal and the communication of data can be carried out with host computer by RS485 interface.
Claims (2)
1. the big current intelligent integral detector based on Luo-coil, it is characterized in that, comprise Luo-coil current acquisition, A/D change-over circuit, single-chip microcomputer, relay bound warning circuit, 4-20mA analog output circuit, RS485 serial interface circuit, keyboard and digital-scroll technique circuit module, the output of described Luo-coil current acquisition is connected with described A/D change-over circuit, the output of described A/D change-over circuit is connected with described single-chip microcomputer, the output of described single-chip microcomputer and described relay bound warning circuit, 4-20mA analog output circuit, RS485 serial interface circuit, digital-scroll technique circuit connects, the output of described keyboard is connected with described single-chip microcomputer.
2. the big current intelligent integral detector based on Luo-coil according to claim 1, it is characterized in that, Luo-coil in described Luo-coil current acquisition comprises soft plastic rod, uniform winding multi-turn enameled wire on described soft plastic rod, the outside of described Luo-coil is provided with and evenly turns to screen layer by conducting metal strip, and form omnidirectional winding with described Luo-coil, described Luo-coil outermost layer adopts plastic cement as insulating protective layer, closed hoop is become when described Luo-coil uses, its joint is designed to plug-in type, patching two ends is bayonet shape, fixing with ambroin cover respectively, the copper sheathing of the built-in opening of its joint chair makes screen layer, and screen layer is by the extraction earthing potential that goes between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420669345.1U CN204389585U (en) | 2014-11-11 | 2014-11-11 | A kind of big current intelligent integral detector based on Luo-coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420669345.1U CN204389585U (en) | 2014-11-11 | 2014-11-11 | A kind of big current intelligent integral detector based on Luo-coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204389585U true CN204389585U (en) | 2015-06-10 |
Family
ID=53362293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420669345.1U Expired - Fee Related CN204389585U (en) | 2014-11-11 | 2014-11-11 | A kind of big current intelligent integral detector based on Luo-coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204389585U (en) |
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2014
- 2014-11-11 CN CN201420669345.1U patent/CN204389585U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20151111 |
|
| EXPY | Termination of patent right or utility model |