Transformer sizing optimization, loss analysis, Total Owning Cost evaluation, hosting capacity assessment for DER, and OpenDSS-based distribution modelling.

What is Total Owning Cost and why does it matter?

TOC = Purchase Price + (NLL × A factor) + (LL × B factor), where A and B represent the present value of no-load and load losses over the transformer lifetime. A transformer that costs more upfront but has lower losses can save tens of thousands over 25+ years. IEEE C57.120 provides the methodology.

Key Deliverables

• Transformer sizing calculation (demand + growth + DER)
• No-load and load loss analysis (NLL + LL)
• Total Owning Cost (TOC) evaluation per IEEE C57.120
• DER hosting capacity assessment
• OpenDSS distribution model (voltage profiles, losses)

Can my existing transformer handle solar panels?

It depends on the solar system size relative to transformer rating and load. If solar generation exceeds facility load, excess power flows back through the transformer. This reverse power flow can cause voltage rise and protection issues. An OpenDSS model quantifies the impact and determines the maximum DER the transformer can host.