Quality Energy meter using ADE7953 and nrf51822 - Page 1
Forum section: electronics / projects

author: jordy33
author_rank: Newbie
timestamp: May 05, 2014, 09:06:24 pm
content: This project was designed for quality energy control measurement.The energy quality control includes:Sag detection. Some how the system will warn the user when the absolute value of the line voltage falls below the programmable threshold for a number of cycles.Peak detection for current and voltage.Over current and over voltage detection: The system will detects whether the absolute value of the current or waveform exceeds a programmable threshold.The Analog ADE7953 was the choice for this project and the Nordic Semiconductor nrf51822 MCU with Bluetooth 4.0 (low energy).The MCU will record in a SD card all the quality trouble events that the ADE7953 will report using hardware interrupts.The log generated in the sd card will be transferred to an IOS device or Android device using Bluetooth 4.0, for further analysis within the app.Schematichttps://www.flickr.com/photos/123937301@N05/13930315747/Designhttps://www.flickr.com/photos/123937301@N05/14046911001/My project currently only reads the vrms (voltage root mean square) and transfer the info to the app. Currently I'm waiting for a shunt resistor (.001 ohm 3w) from digikey to start my second part of the project, which involves the current and quality controls.I'm willing to answer questions about the project.

author: mjkuwp
author_rank: Unknown
timestamp: May 06, 2014, 01:52:06 am
content: Cool idea for a project. I have seen my company deploy some kind of datalogger to customer sites when they have trouble. They are branded Fluke but the EE tech told me it is a design from a 3rd party. These are older devices and not the current device that Fluke offers.That the sag may be quite easy to do considering that IC has features for setting the number of cycles over which to consider the level. The peaks - at least to me - seem like they would be more trouble.One thing I am curious about in general; what kind of bandwidth is required or desired to capture a surge voltage. I have used that ADE7953 chip for a hobby meter and recall that the bandwidth is ~ 1.3 kHz.If you care to share, why do you suspect that you will have problems with power quality? In my region of the US we are very fortunate to have very strong and stable power. I understand that in the Eastern USA there is more trouble - and especially in the older buildings.

author: jordy33
author_rank: Newbie
timestamp: May 12, 2014, 02:50:11 pm
content: Thanks mjkuwp for your comment.Actually I'm building this sensor to solve an issue about an 4k image projector installed in a museum. (The projector suddenly resets and powers off. The company that it sells it, it says that it must be an energy issue (or an installation problem).In the company that I'm working we sold and installed the 4k projector. So we are trying to figure out what its happening to avoid a legal issue.The ade7953 its a very interesting device. Not only will tell the energy consumption but it will check all the parametric data like sag detection, peak detection and over current.How it works its a mystery to me 'cause I'm just a senior computer programmer in my company.We hope... that the problem its related to an energy quality problem or maybe humidity). (The Yucatan are is very soggy).The last week i added the si7005 to check the relative humidity and temperature. This data is also logged in the sd card. This week should arrive the shunt resistor and by this way i could start all the measurements.Once i have it i will publish the results.

author: nctnico
author_rank: Super Contributor
timestamp: May 12, 2014, 03:32:11 pm
content: If you want to solve legal issues a self build device isn't going to work. Who certified it? Better rent a mains logger with NIST traceable calibration (check) from a reputable brand. A printout from such a machine add least carries some weight while pointing your finger at someone.

author: jordy33
author_rank: Newbie
timestamp: May 13, 2014, 03:49:09 pm
content: We don't want to point fingers, just to know what its happening to solve the problem.That's why we don't need a certified device.