Transformers & Substations

Solar / Storage Skid — Inverter-Duty Step-Up Unit Substation

inverter-duty · up to 34.5 kV

Entogo inverter-duty solar and storage step-up unit substation skid

Overview

An inverter-duty step-up unit substation (solar/storage skid) integrating a liquid-filled step-up transformer, MV switching and inverter interface — stepping inverter low voltage up to 34.5 kV for PV and battery-storage interconnection, 60 Hz. Designed to IEEE C57.12.34, C57.159 and C37.121; UL/CSA certifiable.

This inverter-duty step-up unit substation — a solar/storage skid — integrates a liquid-filled step-up transformer, medium-voltage switching and the inverter interface into one outdoor enclosure for utility-scale PV and battery-storage interconnection. It steps the inverter low-voltage side (typically 600 / 690 / 800 V class) up to 34.5 kV (15 / 25 / 35 kV class) at 60 Hz for medium-voltage collection and grid connection.

The transformer is engineered for inverter duty — harmonic loading, frequent cycling and dual-winding options — referenced to IEEE C57.159, with mineral-oil (or FR3 natural-ester) insulation and ONAN cooling. A remote-monitoring cabinet with UPS oversees operation, and the NEMA 3R outdoor enclosure suits exposed renewable sites. Designed and built to IEEE C57.12.34, C57.159 and C37.121, with UL (cULus) / CSA certification available on request.

Key features

  • Inverter-duty step-up unit substation designed for the harmonic content, frequent loading and dual-winding needs of PV / BESS inverters.
  • Steps inverter low voltage (600 / 690 / 800 V class) up to 34.5 kV for medium-voltage collection and grid interconnection, 60 Hz.
  • Designed and built to IEEE C57.12.34, C57.159 (transformers for inverter-based resources) and C37.121 — UL (cULus) / CSA certification available on request.
  • Integrated MV switching, inverter interface and remote-monitoring cabinet with UPS in one outdoor skid.
  • Mineral oil standard, FR3 natural ester optional; ONAN natural-air cooling; NEMA 3R enclosure for utility-scale sites.

FAQ

Common questions

What does "inverter-duty" mean for this substation transformer?
Inverter-duty units are designed for the harmonic content, frequent loading cycles and (often) dual low-voltage windings of PV and battery-storage inverters — referenced to IEEE C57.159 — rather than conventional utility loading, which protects insulation life on renewable sites.
What voltages does it step between?
It steps the inverter low-voltage side (typically 600 / 690 / 800 V class) up to 34.5 kV (15 / 25 / 35 kV class) for medium-voltage collection and grid interconnection, at 60 Hz.
Which standards and certifications apply?
Designed to IEEE C57.12.34, C57.159 (inverter-applied transformers), C37.121 and IEC 62271-202. UL (cULus) / CSA certification is available on request.

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