CN202815078U

CN202815078U - Current measuring device

Info

Publication number: CN202815078U
Application number: CN 201220501152
Authority: CN
Inventors: 甘婷婷
Original assignee: Aerospace Science and Industry Shenzhen Group Co Ltd
Current assignee: Aerospace Science and Industry Shenzhen Group Co Ltd
Priority date: 2012-09-28
Filing date: 2012-09-28
Publication date: 2013-03-20
Anticipated expiration: 2022-09-28

Abstract

The utility model discloses a current measuring device. The device comprises a fibre optic current sensor for outputting a light intensity signal, a photoelectric converter for converting the light intensity signal into an electrical signal, an analog-to-digital convener for converting the electrical signal into a digital signal, a microprocessor for performing calculation on the digital signal to acquire a current value, and a GPS clock unit for transmitting a synchronous sampling clock signal to the analog-to-digital converter. The GPS clock unit is controlled by the microprocessor to generate the synchronous sampling clock signal. By adopting the fibre optic current sensor, advantages of easy installation, no electromagnetic noise interference and wide measuring range can be realized. Meanwhile, through the synchronous sampling clock signal acquired by adopting the GPS clock unit, the real-time performance of multi-channel sampling operation can be improved. Furthermore, an optical fiber is used as the signal conduction medium, so advantages, such as low cost, large information capacity, etc., can be realized.

Description

A kind of current measuring device

Technical field

The utility model relates to electric system, relates in particular to a kind of current measuring device.

Background technology

Along with the development of China's electric network synthetic robotization, reliability, correctness and accuracy that the transmission line of electricity parameters is measured are had higher requirement.For monitoring accurately operation of power networks state, detection of grid operation troubles, need to gather transmission line of electricity raw data, i.e. alternating current.Therefore, the accurate measurement of Transmission Lines size of current become particularly important.

Existing transmission line of electricity current measurement mode mainly is to adopt the magnetoelectric induction current transformer take electromagnetic induction principle as the basis that the large current conversion in high-pressure side is become the little electric current of standard, and input microprocessor carries out computing again.

Take the current sensor of electromagnetic induction principle as the basis, because of iron core is arranged, have non-linearly, when electric system was short-circuited, the secondary current that the short-circuit current of high amplitude is exported mutual inductor seriously distorted, and causes the protection tripping, makes electric system generation major accident.The measurement mechanism of himself has determined them under high pressure and UHV (ultra-high voltage), has the insulation difficulty, easily blast, measurement range and measuring accuracy be restricted and the electric power system fault state under the easy defective such as saturated.

The utility model content

The defectives such as the technical problems to be solved in the utility model is, narrow and precision is low for the prior art measurement range, the current measuring device of provide a kind of and be easy to install, measures range is wide, measuring accuracy is high and real-time is high.

The technical scheme that its technical matters that solves the utility model adopts is: a kind of current measuring device is provided, described device comprise the output intensity signal fibre optic current sensor, be used for described light intensity signal be converted to electric signal photoelectric commutator, be used for described electric signal be converted to digital signal analog to digital converter, be used for described digital signal is calculated the microprocessor of current value and the gps clock unit that is used for transmitting to analog to digital converter the synchronized sampling clock signal; Wherein: described fibre optic current sensor, described photoelectric commutator, described analog to digital converter and described microprocessor connect successively, described microprocessor is controlled described gps clock unit and is produced the synchronized sampling clock signal, the gps clock unit respectively with described analog to digital converter be connected microprocessor and be connected.

Preferably, described gps clock unit comprise by gps signal produce GPS module as the time reference of clock synchronous, by pulse signal genration as the constant-temperature crystal oscillator of the clock signal of clock synchronous and respectively with described GPS module be connected that constant-temperature crystal oscillator is connected and according to the clock generation circuit of described time reference and described clock signal generation synchronized sampling clock signal.

Preferably, described gps signal obtains by external antenna.

Preferably, described gps clock unit is connected with described microprocessor by serial ports.

Preferably, described fibre optic current sensor is installed on the described transmission line of electricity cable.

Preferably, described light intensity signal is transmitted through the fiber to described photoelectric commutator.

Preferably, described light intensity signal is produced by magneto-optical crystal.

Preferably, described current measuring device is measured the electric current of transmission line of electricity.

Preferably, described analog to digital converter is polylith.

Implement the technical solution of the utility model, have following beneficial effect: adopt fibre optic current sensor to have and be convenient to install, without interference and the wide advantage of measures range of electromagnetic noise; Simultaneously, the synchronized sampling clock signal that adopts the gps clock unit to obtain has improved the real-time of multi-channel sampling, in addition, adopts the signal conductive medium of optical fiber to have the advantages such as the low and information capacity of cost is large.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:

Fig. 1 is the structural representation of the utility model current measuring device;

Fig. 2 is the structural representation of the utility model gps clock unit.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.

In the present embodiment, need to prove that described current measuring device is used for measuring the electric current of transmission line of electricity, this transmission line of electricity can be many.

See also Fig. 1, Fig. 1 is the structural representation of the utility model current measuring device, as shown in Figure 1, described device comprise the output intensity signal fibre optic current sensor 100, be used for described light intensity signal be converted to electric signal photoelectric commutator 200, be used for described electric signal be converted to digital signal analog to digital converter 300, be used for gps clock unit 500 that described digital signal is calculated the microprocessor 400 of current value and is used for transmitting to analog to digital converter 300 the synchronized sampling clock signals; Wherein: described fibre optic current sensor 100, described photoelectric commutator 200, described analog to digital converter 300 and described microprocessor 400 connect successively, the described gps clock of described microprocessor 400 controls unit 500 produces the synchronized sampling clock signals, gps clock unit 500 respectively with described analog to digital converter 300 be connected microprocessor 400 and be connected.It should be explained that in the present embodiment, described light intensity signal is produced by magneto-optical crystal.In addition, above-mentioned gps clock unit 500 is device construction independently, does not repeat them here.

Need to prove, analog to digital converter 300 comprises polylith, to measure the current value of many circuits, the current value of many circuits that to gather and monitor in order to guarantee is the current value in the same moment, need to accomplish clock synchronous between the polylith analog to digital converter, therefore adopt gps clock unit 500 to analog to digital converter 300 transmit the synchronized sampling clock signals with guarantee between the polylith analog to digital converter synchronously.

In this scheme, described gps clock unit 500 is connected with described microprocessor 400 by serial ports, specifically, communicate by letter with described microprocessor 400 by serial ports in described gps clock unit 500, the sampling system that can be this transmission line of electricity current measuring device of a plurality of employings provides the synchronized sampling clock signal, guarantees the real-time of sampling system.

Should be noted that, fibre optic current sensor 100 is applied in the transmission line of electricity current measuring device, have and be convenient to install, without interference and the wide advantage of measures range of electromagnetic noise, in this scheme, described fibre optic current sensor is installed on the described transmission line of electricity cable, in addition, for the principle of work of fibre optic current sensor 100, those skilled in the art should understand, and does not repeat them here.

It is worth mentioning that, described light intensity signal is transmitted through the fiber to described photoelectric commutator 200, adopt the signal conductive medium of optical fiber in this scheme, have that loss is little, bandwidth, information capacity is large, insulating property are high, thunder-lightning and anti-electromagnetic interference (EMI), can effectively stop the advantages such as harm of short circuit accident; In addition, its size is little, and is lightweight, corrosion-resistant and cheap.

Please in conjunction with consulting Fig. 2, Fig. 2 is the structural representation of the utility model gps clock unit, as shown in Figure 2, described gps clock unit 500 comprise by gps signal produce GPS module 501 as the time reference of clock synchronous, by pulse signal genration as the constant-temperature crystal oscillator 502 of the clock signal of clock synchronous and respectively with described GPS module 501 be connected that constant-temperature crystal oscillator 502 is connected and according to the clock generation circuit 503 of described time reference and described clock signal generation synchronized sampling clock signal; Specifically, microprocessor 400 is actually control GPS module 501 and when exports synchronous sampling signal and control sample frequency when control gps clock unit 500.And, by such scheme, the synchronized sampling clock signal that gps clock unit 500 produces can be supplied with a plurality of chips, for example chip MAX11046 simultaneously, guarantee all sampling quantities synchronously, the poor problem of data sampling real-time when having solved the Multi-path electricity flow and monitoring simultaneously.

In this scheme, described gps signal obtains by external antenna, and wherein, described GPS module 501 adopts chip LEA-6T, and size only is 17.0 x, 22.4 x 2.4mm, has the characteristics such as high sensitivity, low-power consumption.In addition, this GPS module 501 adopts 50 parallel tracking channel designs, receives the C/A code information from the Ll wave band, and tracking sensitivity is-160dBm that location and time service scope are expanded to the place that traditional GPS receiver can not cover; The maximum renewal frequency of data is 5Hz, and configurable clock generator frequency range is: 0.25Hz-10MHz; Operating voltage range is: 2.7VDC-3.6VDC, do not give unnecessary details one by one at this.

Compared to prior art, adopt fibre optic current sensor to have and be convenient to install, without interference and the wide advantage of measures range of electromagnetic noise; Simultaneously, the synchronized sampling clock signal that adopts the gps clock unit to obtain has improved the real-time of multi-channel sampling, in addition, adopts the signal conductive medium of optical fiber to have the advantages such as the low and information capacity of cost is large.

The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the claim scope of the present utility model.

Claims

1. current measuring device, it is characterized in that, described device comprise the output intensity signal fibre optic current sensor, be used for described light intensity signal be converted to electric signal photoelectric commutator, be used for described electric signal be converted to digital signal analog to digital converter, be used for described digital signal is calculated the microprocessor of current value and the gps clock unit that is used for transmitting to analog to digital converter the synchronized sampling clock signal; Wherein: described fibre optic current sensor, described photoelectric commutator, described analog to digital converter and described microprocessor connect successively, described microprocessor is controlled described gps clock unit and is produced the synchronized sampling clock signal, the gps clock unit respectively with described analog to digital converter be connected microprocessor and be connected.

2. device according to claim 1, it is characterized in that, described gps clock unit comprise by gps signal produce GPS module as the time reference of clock synchronous, by pulse signal genration as the constant-temperature crystal oscillator of the clock signal of clock synchronous and respectively with described GPS module be connected that constant-temperature crystal oscillator is connected and according to the clock generation circuit of described time reference and described clock signal generation synchronized sampling clock signal.

3. device according to claim 2 is characterized in that, described gps signal obtains by external antenna.

4. device according to claim 2 is characterized in that, described gps clock unit is connected with described microprocessor by serial ports.

5. device according to claim 1 is characterized in that, described fibre optic current sensor is installed on the described transmission line of electricity cable.

6. device according to claim 1 is characterized in that, described light intensity signal is transmitted through the fiber to described photoelectric commutator.

7. device according to claim 1 is characterized in that, described light intensity signal is produced by magneto-optical crystal.

8. device according to claim 1 is characterized in that, described current measuring device is measured the electric current of transmission line of electricity.

9. device according to claim 1 is characterized in that, described analog to digital converter is polylith.