Reference Design to Measure AC Voltage & Current in Protection Relays w/Delta-Sigma Chip Diagnostics
The TIDA-00810 reference design accurately measures analog inputs performance and includes chip diagnostics to help identify power systems failures early by using a highly accuracy AC voltage and current measurement analog front end (AFE) and a four-channel, 24-bit simultaneously-sampling differential input Delta-Sigma ADC for measurement over wide dynamic range. The ADC is configured to measure 0-5 V unipolar. The inputs are scaled to ADC measurement range using a fixed gain amplifier with 2.5 V DC output level shift. The AFE can be used to measure output of a current transformer, potential divider with analog isolation and Rogowski active integrator. The AFE uses 10-Bit low resolution successive approximation register (SAR) ADC in parallel with a 24 bit ∑-∆ ADC for ADS131A04 diagnostics.
- Data acquisition and diagnostics coverage provided using 24-bit ∑-∆ ADC and 10/12-bit SAR ADC
- Output from the ∑-∆ ADC is validated by comparing it with SAR ADC – peak/RMS value is used for validation
- ∑-∆ ADC reference output or external reference is monitored using a comparator
- Current measurement accuracy is verified using current transformer and Rogowski coil with hardware integrator
- Voltage measurement accuracy is verified using a potential divider (PD) without and with an isolation amplifier
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Design files & products
Download ready-to-use system files to speed your design process.
Reference design overview and verified performance test data
Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Detailed overview of design layout for component placement
Files used for 3D models or 2D drawings of IC components
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Includes TI products in the design and potential alternatives.
ADC104S021 — 10-Bit, 200-kSPS, 4-Ch SAR ADC with single-ended inputs and serial interfaceData sheet: PDF
|*||Design guide||Ref Design to Measure AC Volt and Curr in Protection Relay w/ DS Chip Diagnostic (Rev. A)||Nov. 15, 2016|
|Technical article||Exploring high-voltage transmission – part 1, line-commutated converters||Mar. 07, 2017|
|Technical article||Tripping Point: Isolation amplifier-based alternating current voltage measurement in protection relays||Oct. 07, 2016|
|More literature||TIDA-00810 Firmware||Jul. 07, 2016|
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