Working on a case here in Tulsa where PSO is applying transformer loss adjustments that seem way too high on a customer-owned 12.47kV to 480V transformer. They're using a standard 2.5% loss factor but the actual losses should be closer to 1.2% based on the transformer nameplate and load characteristics. Has anyone successfully challenged PSO on transformer loss calculations? The difference is costing my client about $800/month.
Anyone else fight PSO on transformer loss adjustments?
Rick, I've dealt with PSO on transformer issues before but not specifically loss adjustments. Are they applying this under Schedule CS or is this a special contract? The 2.5% seems high for a modern transformer unless it's really old or oversized for the load.
It's under Schedule LPS, Ed. The transformer is only about 8 years old and properly sized. PSO claims they use 2.5% as a "conservative estimate" for all customer-owned transformers, but that doesn't seem right. I'm thinking about hiring an engineer to do actual loss testing to prove the point.