thx for the post, my question is, how can I do to have also negative power as indeed I have photovoltaic panels and I want to now when I send power outside Is it also possible to add only 1 transfo to mesure the voltage? Your entrance or front door to your home is the first thing people look at when they walk past, drive past or come to 12 Ideas To Use Ordinary Things In Extraordinary Ways, Using Arduino Functions Correctly, Make Your Code More Efficient, https://github.com/samotage/Aiko/blob/master/SEGmeter/seg_meter_v0_199.pde, https://www.the-diy-life.com/connect-an-lcd-screen-to-an-arduino/, https://learn.openenergymonitor.org/electricity-monitoring/ct-sensors/interface-with-arduino?redirected=true, The reTerminal E10-1, the First Expansion Board for the reTerminal, What Makes TMC2208 Stepper Motor Drivers Silent, I Made A Home Assistant Hub Using The Atomstack X20 Pro, Recondition a Lead Acid Battery, Dont Buy A New One, DIY Raspberry Pi 4 Desktop Case With OLED Stats Display, How To Upgrade Your Homes Entrance & Increase Curb Appeal, 3 x CTs Talema AC1030 (See below for options and purchaselinks), CTYRZCH SCT-013-000 100A Built In Burden Resistor . The closest standard resistor value is 56, so this was used.

Next you need to size your burden resistor R3, this converts your CT current into a voltage reference. This will enable you to measure true power rather than apparent power and should also improve the accuracy of your meter. Upon startup, youll see a 3 Phase Energy Meter screen followed by cycling through the current, power, maximum power and kilowatt hours consumed screens. Any suggestions? Yes at the moment since they're allowing us to call and give our meter readings they might as well just read it off a display. RMSCurrent[i] = ((maxCurrent 516)*0.707)/calib[i]; //Calculates RMS current based on maximum value and scales according to calibration calculate the root from the result of the division The Arduino uno doesn't really have enough output pins to drive two LCDs but you could setup the LCD to change between two screens, one containing the cumulative kWh. Is it possible made input voltage and calculate with this? They may be higher or lower depending on your application. Good luck, sounds like an awesome project to try! Connect a analog board to a nodeMCU. Do not remove any wires or remove any screws before checking your local regulations with your local authority, you may require a certified electrician to install the CT for you. its been a while and I eventually got the 3 phase up and working but regarding some fine tuning i just want to check some things in the code if you would explain it to me, if (maxCurrent <= 517) < where does this 517 come from? Note that they do not have provision for a CT so I have just used a waveform generator as an input which is triplicated onto all three CT inputs, the waveform generator is not really suitable so the displayed results are erratic. First you need to start by assembling your components onto the CTs to create the current sensors which produce a signal which your Arduino can understand. Doesnt matter if i draw 1amps or 16amps. Searched some more and will start the build from scratch as the issue is resolved. Nice and useful project. the images for connecting to the CT arent clear. Either use linear scaling to calculate this figure or, if youre not good with math, play around with different values until the load you have plugged in is shown on the energy meters screen. Federico C. Hi Federico, With a few changes to the code, you can also add your local tariffs and display the cost of electricity used to date. Would it be difficult to modify the sketch to only measure 2 inputs, and then add both inputs to display the total on lcd or serial monitor? Question Here is the link to download the 3 phasemeter code. The regular Arduino jumper wires should suffice? [emailprotected]. I want to send the data to esp8266 to send the data to a could to graph and analyzethe data on monthly basis. So I decided to take the time to build a 3 phase energy meter and fix up a couple of areas in the original energy meters code which could have been done better. Upon startup, youll see a 3 Phase Energy Meter screen followed by cycling through the current, power, maximum power and kilowatt hours consumed screens. Hey If my Kwh consumption is large enough and i need the exact potential for the voltage which in this case you've taken directly a constant voltage.how can i get the PT value for three phase and from what thing i can get it?? Then it will be more precision. Any idea on how the circuit diagram will be. Also choose 1% or better tolerance burden resistors AND make sure the wattage is applicable to the CT! Hi, could you advise me how to plug and set the measuring transformer SCT 013-030 AC split-core Current Transformer 30 A 1 Thank you. What do you mean by the same current and power readings. You can email the code and any photos you have through to admin(at)the-diy-life.com and well have a look at posting your project, with credit to you of course. How can this circuit be modified to have a 3 phase power loss monitoring system. 1 year ago, Thank you fo the information. Then connect the +ve sides to adc1, adc2 and adc3 (with burder resistors on each). Once you have connected all of your components, you need to connect your sensors onto the supply you want to monitor. Since writing up thearticle on how to build a simple Arduino home energy meter which measured the energy consumption for a single phase, Ivehad a number of people ask about doing a 3 phase energy meter. Simply how this should be done is: How can I adapt this to my 2-phase installation? fyp ieee 5 years ago. For a list of some options on different CTs and their ideal burden resistors, visit this link. Its really easy to modify the code to measure 2 inputs as the inputs are stored in an array.

You have entered an incorrect email address! Thanks ! 1. This code, unlike our original simple Arduino energy meters code makes use of the millis() function to calculate the duration between cycles instead of relying on an estimate, this results in a slightly more accurate (about 0.5%) calculation. The capacitor used is 10F which should be sufficient for most CT ranges for household applications. is this porject using dc or ac energy meter? Thank you. If you are going to be installing your power meter somewhere permanently then you may want to solder the resistors and capacitor directly onto eachCT so that they cannot come loose. It really can be made quite simple, there are two things which typically complicate it, one is when your supply is three wire three phase (this setup and code require the neutral) and the second is if you have very inductive or capacitive loads (low power factor). An Arduino only has analogue voltage inputs which measure 0-5VDC, so you need to convert the current output from the CT into a voltage reference and then scale it into the 0-5V input range. It would certainly make the circuit simpler. Again, with this meter I was going for simplicity. Start by dividing your primary current (the maximum as used above) by your CTs turns ratio (available on the data sheet). You do not connect the CT straight to the Arduino, you need to connect it as shown in the circuit diagram with the resistors and capacitors to create an input circuit. Once you have you energy meter calibrated and the scaling factors have been uploaded onto the Ardunio, your meter should be ready to connect and leave to monitor your energy consumption. Another thing for Arduino and this kind of stuff, which is useful for current sensor selection, is that many sensors have a 0.333V output.

Youll have to install a step down transformer to around 3V for the Arduino to read the voltage. Nice work Always fun when something like this can be put together. The LCD screen shield already picks up on the analogue inputs but only A0 is used by the shield for the button inputs. For connection to a typical 3 phase mains supply, connect one CT around each of the phases as shown below. Sure, for perfectly accurate measurements you need to measure both the supply current and voltage but for this application and in the interests of keeping the energy meter simple and safe only requiring a non-contact connection to your mains Ive decide to stick with a simple current measurement which gives you an estimate to within a couple of decimal points of a kilowatt hour. As it takes into account peak to peak amps not RMS values which makes 4 years ago. 2. I was about to purchase an Arduino Uno Wifi board but it seems they are no longer making them. first off all maybe my measuring points are wrong, but when I measure between the analogue inputs on the arduino uno and as negative the wire that supplies the CT sensor I measure always 2.47volts +/-0.10. As for the resolution and accuracy of the meter, I am planning to use a 16bit ADC which will increase the resolution of the analog port from 1024 to 65536. Hi! Setting the Arduino analog reference to INTERNAL, means that it uses the internal 1.1V as its ADC vRef a handy hint I got from @jonoxer once upon a time. This meter measures the supply current through each phase using a CT (current transformer) and then does a few calculations to give you the current, power, maximum power and kilowatt hours consumed for each phase.

For those of you who have read that the millis() function goes into overflow after about 49 days, the code deals with the rollover automatically by making use of the unsigned long variable. Since writing up instructions on how to build a simple Arduino home energy meter which measured the energy consumption for a single phase, Ive had a number of people ask about modifying it to be a 3 phase energy meter. Reply Yes if your voltage is constantly changing then youre going to get inaccurate results. The amplitude of this wave should vary with 2.5V being 0 amps and 5V being the maximum youve calculated and sized your burden resistor for. If you connect them directly to the Arudino inputs then youll have a voltage input onto the Arduinos analogue inputs which fluctuates positive and negative and you dont want to be putting a negative voltage onto the Arduinos inputs, it doesnt handle this well. So you should see a change in amplitude if the CT is sensing more current. Just using LCD Screen 16*2, Hi Ahmad, A couple of notes based on my experience! Reply The line you are referring to is defining the zero current line of the AC waveform. Hi Jayd,

If you are simply trying this project for fun then a breadboard is perfect. I never realized how simple measuring 3-phase could actually be. Question With same current its repeating identical every 20millisec (230ac -50hz) It seems that the 16,91 amps corresponds with a 5volt amplitude (but its only there for a short while, I geuss this is why the multimeter reads 2.5V all the time. Cant explain it myself maybe you have an idea. Dear Michael, Yes, you could either connect a data logger through SPI or I2C or simply connect an SD card reader/writer to the Arduino and have it write the data to a CSV file. The code however wont allow for a negative energy measurement, it will just be ignored. They essentially operate in a similar way (they measure current and often voltage to calculate energy usage) however you will need different sensors to measure the current usage in AC and DC applications and the way in which the data is processed to give you your energy consumption will be different. If it for DC energy meter, can i ask your help for AC energy meter porject? While there is a rangeof commercially available single phase energy meters available, the 3 phase meters arent nearly as common and tend to be quite expensive. In order to do this accurately, you need to find a calibrated load. Most of the work will be in modifying the display code to suite your application but youll only be working with the summed results and not the array elements. It depends on how inductive. What about the schematic, should I just scrap the phase 3 circuit? 2.5V/0.033=75Ohm 1/4W Safety.

Add a line to sum up the array values in position 0 and 1. Can you please explain ? RMSPower[i] = 220*RMSCurrent[i]; < if it is 3 phase should this not be like 400, I have got the box built and hooked it up to emoncms so i get pretty nice graphs and the bells and whistles .. its just as soon as i check on the "lives" of the 3 phase i get about a 6 amps difference, We are actually measuring a cold rooms compressor. Youll need to build a meter which measures and logs both the voltage and current produced in order to accurately estimate power and energy produced. Is this set up abble to store data? how to connect an LCD screen to an Arduino, Arduino Robotic Arm Controlled by Touch Interface. They may be higher or lower depending on your application. This meter measures the supply current through each phase using a CT (current transformer) and then does a few calculations to give you the current, power, maximum power and kilowatt hours consumed for each phase. Yes, you'd simply remove one of the CTs and one of the sections of the code. } Hi Muhammad, Your analogue reference voltage to the Arduino is 2.5V so to determine the resistance you use R=V/I R=2.5/0.042=59.5. on Step 7. Your calculations and components look correct. In this case they were 11.8337 for phase 1, 11.8234 for phase 2 and 12.0325 for phase 3. 16.91amps x1.414=almost 25Amps How exactly do you feed the signal to the arduino? I wanted to measure the output from the wind turbine itself which is not an true RMS, the rated frequency of the wind turbine is 32Hz. Note, the V2 SEGmeter uses a separate 12 bit ADC over SPI. talema AS-105 750:1 Hi Michael, Does the code need to be modified to read only 2 inputs? In order to do this accurately, you need to find a calibrated load. Since most household wouldnt have too many low power factor contributors, the meter works quite accurately. As mentioned above, because your setup, CTs , resistors and input voltages may be different, there is a scaling factor in the sketch for each CT which you will need to change before you will get accurate results. They must be the same value, so R1=R2 and we dont need much current so this articles uses two 100K resistors. These are not easy to come by in a normal household so you will need to find something which uses an established and consistent amount of power. Question I doubt that the utility company would be happy to use readings from a homemade meter but that sounds like an interesting application. When i do a test setup everythings works great i have different reading for power and current dependent on the load i use on one of the 3 phases. My supply voltage is also changing, can you teach me how to install the step down transformer sir to read the accurate voltage? Do not remove any wires or remove any screws before checking your local regulations with your local authority, you may require a certified electrician to install the CT for you. You will now need to adjust the scaling factors defined in line 8 accordingly: double calib[3] = {11.8337,11.8234,12.0325}. But when i instal everything in the electric cabinet the readings are wrong. Hi meassure is not good, because, there is problem with voltage.. some times 210 some times 239 .. then is a lot of difference.



Sitemap 3