Schweitzer Engineering Laboratories
Newsroom
Apr 11, 2018
SEL Meter Exceeds Newest and Most Stringent ANSI 0.1 Accuracy Class
By complying with strict new metering standards, the SEL-735 Power Quality and Revenue Meter is helping utility operators ensure every kilowatt-hour is accounted for.ANSI, the organization that sets the North American revenue metering standards, recently updated their standards to include a new accuracy class that requires higher metering accuracy and better performance, even under challenging nonsinusoidal system conditions. The SEL-735 exceeds these new, tougher requirements. Several megawatt-hours of energy pass through a metering installation each day. Installing accurate meters and instrument transformers ensures proper accounting of energy transactions and losses, leading to a fair return on investments for operators.To ensure that meters provide reliable and highly accurate metering under all power system conditions, ANSI revised their C12.20-2015 standard to include six additional tests. The revisions include a new 0.1 Accuracy Class with more stringent accuracy requirements than the previous 0.2 Accuracy Class. ANSI also expanded the accuracy class test conditions to include meter performance under real-world conditions, such as operation in the presence of nonlinear loads that cause harmonics in the system. The SEL-735 complies with the new ANSI 0.1 Accuracy Class requirements, including the performance requirements under nonsinusoidal conditions. The SEL-735 meter’s compliance shows that it accurately reports bidirectional energy, even in the presence of harmonics and distorted waveforms.Learn more about the SEL-735 on the product page.