CN204495984U - A kind of electric-power metering local supervising and measuring equipment based on ARM - Google Patents

Abstract

The utility model relates to and discloses a kind of electric-power metering local supervising and measuring equipment based on ARM, photoelectric sampler, hand switch, electronic watch pulse input end is connected with pulse signal shaping circuit respectively, pulse signal shaping circuit and ARM embed controller and are connected, described electric energy computation chip and ARM embed controller and adopt and be bi-directionally connected, described ARM embed controller respectively with display module, digital dock chip, printer, power module connects, the utility model is based on two panels electric energy computation chip, particularly utilize electric energy computation chip current channel precision high, the feature of good stability is sampled to voltage, achieve to measuring apparatus once and on-line measurement while secondary circuit, the overall precision of instrument can be improved, by to composition error, the crucial measuring parameters such as ammeter error and transformer error carry out Real-Time Monitoring, and based on arm processor, make the realization of man-machine interface operation part easier, with better function, operation also hommization more.

Description

A kind of electric-power metering local supervising and measuring equipment based on ARM

[technical field]

The utility model relates to electric-power metering monitoring technical field, specifically a kind of electric-power metering local supervising and measuring equipment based on ARM.

[background technology]

Electric power metering device local supervising and measuring equipment to be correlated with norm standard according to country, aim at the smart instrumentation of electric administrative department line loss reducing, anti-electricity-theft on-line checkingi, instrument can when not having a power failure, not changing measurement loop wiring, measure the error of the composition error of single-phase measurement case and electric energy meter, mutual inductor online, and print result.And then judge that the open circuit in loop, short circuit, loose contact, T reverse polarity connection, CT change and nameplate such as not to be inconsistent at the metering fault, be the useful tool that electric administrative department is looked into stealing, looked into fault, remedies the electricity charge.

The overall precision of traditional electric-power metering monitoring device instrument is not high, not little by carrying out Real-Time Monitoring scope to crucial measuring parameters such as composition error, ammeter error and transformer errors, traditional monitoring equipment is bulky, complex operation, realize more difficult, function is more single.

Therefore, for overcoming the deficiency of above-mentioned technology and designing that current channel precision is high, good stability, the overall precision of instrument can be improved, make the realization of man-machine interface operation part easier, with better function, operate a kind of electric-power metering local supervising and measuring equipment based on ARM of also hommization more, inventor's problem to be solved just.

[utility model content]

For the deficiencies in the prior art, the purpose of this utility model is to provide a kind of electric-power metering local supervising and measuring equipment based on ARM, its current channel precision is high, good stability, the overall precision of instrument can be improved, make the realization of man-machine interface operation part easier, with better function, operate also human nature more, have extraordinary practical value.

The utility model solves the technical scheme that its technical matters adopts: a kind of electric-power metering local supervising and measuring equipment based on ARM, and it comprises primary circuit clamp transformer current sampling input end, phase voltage sampling input end, secondary circuit clamp transformer current sampling input end, photoelectric sampler, hand switch, electronic watch pulse input end, electric energy computation chip, ARM embeds controller, pulse signal shaping circuit, power module, AC/DC switch, printer, digital dock chip, rectangle keyboard, display module, described primary circuit clamp transformer current sampling input end, phase voltage sampling input end, secondary circuit clamp transformer current sampling input end is connected with electric energy computation chip respectively, described photoelectric sampler, hand switch, electronic watch pulse input end is connected with pulse signal shaping circuit respectively, and described pulse signal shaping circuit and ARM embed controller and be connected, and described electric energy computation chip and ARM embed controller and adopt and be bi-directionally connected, described ARM embed controller respectively with display module, digital dock chip, printer, power module connects.

Further, described power module is connected with AC/DC switch, and described power module is DC/DC power module.

Further, described printer is minitype thermal printer.

Further, described display module is LCD.

Further, described electric energy computation chip quantity is two groups, and described two groups of electric energy computation chips adopt and are connected in parallel.

The beneficial effects of the utility model are:

1, the utility model is based on two panels electric energy computation chip, particularly utilize electric energy computation chip current channel precision high, the feature of good stability is sampled to voltage, achieve to measuring apparatus once and on-line measurement while secondary circuit, the overall precision of instrument can be improved, by to composition error, the crucial measuring parameters such as ammeter error and transformer error carry out Real-Time Monitoring, electric administrative department can be made to proofread the error of measuring apparatus in time, electricity theft prevention phenomenon occurs, and based on arm processor, make the realization of man-machine interface operation part easier, with better function, operation also hommization more.

2, the utility model is equipped with accurate split core type current transformer, in not power-off, when not changing measurement loop, detect measuring apparatus, the error of electric energy meter and mutual inductor, show the primary current under instantaneous detected state, secondary current, voltage, mutual inductance ratio, there is photoelectricity sampling and manual sampling pulse inputs 3 kinds of metering systems, accuracy class reaches 0.2 grade, there is low frequency pulse signal export, facilitate censorship, do not need separately to connect power supply, simultaneously, in order to take into account the application in city and country electrical network, also field operation environment will be considered in the outer design of content with funtion, be convenient for carrying and the large-scale factor such as change in voltage, to adapt to the requirement of field monitoring.

[accompanying drawing explanation]

Fig. 1 is the utility model one-piece construction schematic diagram.

Fig. 2 is the utility model electric energy measurement process flow diagram.

Description of reference numerals: 1-primary circuit clamp transformer current sampling input end; 2-phase voltage sampling input end; 3-secondary circuit clamp transformer current sampling input end; 4-photoelectric sampler; 5-hand switch; 6-electronic watch pulse input end; 7-electric energy computation chip; 8-ARM embeds controller; 9-pulse signal shaping circuit; 10-power module; 11-AC/DC switch; 12-printer; 13-digital dock chip; 14-rectangle keyboard; 15-display module.

[embodiment]

Below in conjunction with specific embodiment, set forth the utility model further, should be understood that these embodiments are only not used in restriction scope of the present utility model for illustration of the utility model.In addition should be understood that those skilled in the art can make various changes or modifications the utility model after the content of having read the utility model instruction, these equivalent form of values drop on application appended claims limited range equally.

Be the utility model one-piece construction schematic diagram see Fig. 1, device comprises primary circuit clamp transformer current sampling input end 1, phase voltage sampling input end 2, secondary circuit clamp transformer current sampling input end 3, photoelectric sampler 4, hand switch 5, electronic watch pulse input end 6, electric energy computation chip 7, ARM embeds controller 8, pulse signal shaping circuit 9, power module 10, AC/DC switch 11, printer 12, digital dock chip 13, rectangle keyboard 14, display module 15, primary circuit clamp transformer current sampling input end 1, phase voltage sampling input end 2, secondary circuit clamp transformer current sampling input end 3 is connected with electric energy computation chip 7 respectively, photoelectric sampler 4, hand switch 5, electronic watch pulse input end 6 is connected with pulse signal shaping circuit 9 respectively, and pulse signal shaping circuit 9 and ARM embed controller 8 and be connected, and electric energy computation chip 7 and ARM embed controller 8 and adopt and be bi-directionally connected, ARM embedding controller 8 respectively with display module 15, digital dock chip 13, printer 12, power module 10 connects.

Power module 10 is connected with AC/DC switch 11, and printer 12 is minitype thermal printer, and display module 15 is LCD, and electric energy computation chip 7 quantity is two groups, and two groups of electric energy computation chips 7 adopt and are connected in parallel.

Device with ARM controller S3C44B0X for core, adopt two panels electric energy computation chip 7 simultaneously to once, the electric current and voltage input of secondary circuit measures, coordinate the Puled input of electric energy meter, measuring apparatus composition error, electric energy meter error and transformer error can be calculated simultaneously, embed controller 8 by ARM and drive 650,000 look colorized lcd display models 15 and matrix keyboard 14 to realize human-computer interaction interface.

The error parameter of the printable output of minitype thermal printer and date, adapt to the requirement of Width funtion application, adopt AC/DC Switching Power Supply and DC/DC power module to be system power supply.

Principle of work of the present utility model first precise sprit core transformer should be clipped in tested load once respectively, secondary current loop, according to the difference of tested electric energy meter and the restriction of measurement environment condition, optionally take from flowing mode and manual mode detects, under automated manner, if tested electric energy meter is electronic type, directly its pulse can be exported and be connected to detector, if electric energy meter is that mechanical type is then buckled on ammeter by photoelectric sampler, photoelectricity is aimed at watt-hour meter dial, be adjusted to normal sample, what at this moment input detector is the pulse of photoelectric sampler, then, the verification number of turns entered from the keyboard, tested table kilowatt hour indicator revolution, after the preset parameters such as tested mutual inductor change, just can implement automatic gauge to detect.

Under manual mode, pulse manually presses panel left-hand seat button by people or annex hand switch 5 inputs, connect preset parameter after line, due to the manual and collimation error, the number of turns should be suitably some more, and when rotating disk colour code goes to dead ahead, speed clicks hand switch 5, namely start to detect, when detected table turns the number of turns of enough settings, then click hand switch 5, this directional error can be shown.

Human-computer interaction interface is made up of operation keyboard and 65k true color LCD MODULE 14, controlled by ARM, keyboard is used for parameters input and control, matrix keyboard 14 is taked to complete 0-9 numeral and operating key, color LCD display module mainly completes boot animation, measurement result list and curve display, electronic description, the display of magic lantern picture etc., LCD MODULE selects 4.3 inches of widescreen TFTLCD, resolution is 480 × 272, system configuration 32MB character library and 96MB storage space, can meet the demand of picture, animation and text display.

Phase voltage is 175 ~ 240V, but voltage large so directly can not be given electric energy computation chip 7 and carry out A/D conversion, by two fixed resistances and a potentiometer dividing potential drop, obtain the voltage sampling signal of about 400mV, and be current forms from the signal of mutual inductor, need the current measurement passage being converted to the signal feeding electric energy computation chip 7 of voltage form through potentiometer, in order to carry out suitable isolation by from the signal of line of electric force and electric energy computation chip 7, between electric current and voltage sampled signal, amplifier is selected to form voltage follower circuit.

After needing to carry out signal shaping conversion isolation from the pulse of photoelectric sampler or electronic electric energy meter, then give the external interrupt input of ARM, adopt NPN triode to carry out the conversion of switching value.

Electric energy computation chip 7 is by the electric current of sampling and voltage analog signal digitizing, in current channel, Hi-pass filter has filtered the flip-flop in input signal, current signal is reduced into by digital integrator, voltage signal sends into voltage channel, be multiplied and can obtain applied power with conditioned current signal through analog to digital conversion after phase correction, the effective value of voltage and current is multiplied acquisition active power, active power signal is exported by CF pin by number conversion frequently, simultaneously and voltage signal, current signal, applied power signal sends into register together, ARM selects to realize to once by two chip selection signals, measurement data inquiry and the collection of secondary circuit, comparatively voltage channel is more stable for the current channel output data of electric energy computation chip 7.The utility model electric energy measurement process flow diagram see Fig. 2, when measuring primary circuit, voltage signal is added in the voltage channel of first electric energy computation chip 7, and the voltage signal of secondary circuit is added in the current channel of second electric energy computation chip 7, in fact, due to once, the voltage of secondary circuit is all phase voltage 220V, the output valve of getting second current channel like this can be more accurate as the measured value of phase voltage, two panels electric energy computation chip 7 is selected to implement the monitoring of Monophase electric power measuring apparatus, not only can measure once simultaneously, secondary circuit parameters, and higher precision can be obtained, this is highly significant to the accuracy class of raising instrument entirety.

Show date in real time and clock after starting shooting, and provide temporal information when printout result, clock core DS1302 is adopted to design calendar circuit, and in order to clock still can be kept after power down, be equipped with 3.6V lithium battery, meanwhile, clock can be used for carrying out electric energy metrical to ADE7753 output high-frequency impulse CF.

The utility model selects minitype thermal printer, its built-in character library, be parallel interface with the communication interface of arm processor, it should be noted that, printer there are certain requirements the power of power supply and ripple, has therefore selected DC/DC isolation module for it is for 5V power supply, the requirement that complete machine power supply is considered Width funtion variation range and is convenient for carrying, do not select transformer linear stabilized power supply, but have selected AC/DC Switching Power Supply.

As embedded controller, task has been the control of man-machine interface, and realization matrix input through keyboard detects, the interactive function that boot animation display, function menu, data and curve display, electronic description and picture slide show etc. are abundant.

Claims (5)

1. based on an electric-power metering local supervising and measuring equipment of ARM, it is characterized in that: it comprises primary circuit clamp transformer current sampling input end, phase voltage sampling input end, secondary circuit clamp transformer current sampling input end, photoelectric sampler, hand switch, electronic watch pulse input end, electric energy computation chip, ARM embeds controller, pulse signal shaping circuit, power module, AC/DC switch, printer, digital dock chip, rectangle keyboard, display module, described primary circuit clamp transformer current sampling input end, phase voltage sampling input end, secondary circuit clamp transformer current sampling input end is connected with electric energy computation chip respectively, described photoelectric sampler, hand switch, electronic watch pulse input end is connected with pulse signal shaping circuit respectively, and described pulse signal shaping circuit and ARM embed controller and be connected, and described electric energy computation chip and ARM embed controller and adopt and be bi-directionally connected, described ARM embed controller respectively with display module, digital dock chip, printer, power module connects.

2. a kind of electric-power metering local supervising and measuring equipment based on ARM according to claim 1, it is characterized in that: described power module is connected with AC/DC switch, described power module is DC/DC power module.

3. a kind of electric-power metering local supervising and measuring equipment based on ARM according to claim 1, is characterized in that: described printer is minitype thermal printer.

4. a kind of electric-power metering local supervising and measuring equipment based on ARM according to claim 1, is characterized in that: described display module is LCD.

5. a kind of electric-power metering local supervising and measuring equipment based on ARM according to claim 1, is characterized in that: described electric energy computation chip quantity is two groups, and described two groups of electric energy computation chips adopt and are connected in parallel.