--- title: "36 kV Oil-Immersed Power Transformer | Entogo" description: "A liquid-filled (mineral oil) three-phase power transformer for substation and subtransmission duty in 34.5 / 35 / 36 kV networks, rated 2.5 to 31.5 MVA…" url: https://entogo.ca/products/oil-immersed-power-transformer-36kv/ lang: en type: website image: https://entogo.ca/_astro/Entogo-35kV-Three-Phase-Oil-Immersed-Distribution-Transformer.BWoRk9EQ.png alternates: en: https://entogo.ca/products/oil-immersed-power-transformer-36kv/ fr-CA: https://entogo.ca/fr/products/oil-immersed-power-transformer-36kv/ es: https://entogo.ca/es/products/oil-immersed-power-transformer-36kv/ ar: https://entogo.ca/ar/products/oil-immersed-power-transformer-36kv/ site: https://entogo.ca/ llms: https://entogo.ca/llms.txt --- Home › Products › Transformers & Substations › 36 kV Oil-Immersed Power Transformer Transformers & Substations # 36 kV Oil-Immersed Power Transformer 2.5 – 31.5 MVA · 36 kV class Configure & quote ## Customize your 36 kV Oil-Immersed Power Transformer and get a quote. [Configure & get a quote](https://entogo.ca/products/transformer-quote?from=36%20kV%20Oil-Immersed%20Power%20Transformer) ![Entogo 36 kV class three-phase oil-immersed power transformer for substations](https://entogo.ca/_astro/Entogo-35kV-Three-Phase-Oil-Immersed-Distribution-Transformer.BWoRk9EQ_Z1dAjmQ.webp) Overview A liquid-filled (mineral oil) three-phase power transformer for substation and subtransmission duty in 34.5 / 35 / 36 kV networks, rated 2.5 to 31.5 MVA with ONAN / ONAF cooling, off-circuit or on-load tap changing and copper windings, designed to IEEE C57.12.00 / C57.12.10 and IEC 60076. Entogo designs and builds the 36 kV Oil-Immersed Power Transformer in its own factory with a vertically integrated supply chain: this product ships in 16–24 weeks (new UL or CSA certification can extend that, within a guaranteed 36-week worst case), and every Entogo product carries a minimum 36-month manufacturer warranty. Entogo’s **36 kV class oil-immersed power transformer** is a three-phase, liquid-filled unit built for substation and subtransmission service on 34.5 / 35 kV networks across North America, Europe and export markets. Ratings span **2.5 to 31.5 MVA** with ONAN / ONAN-ONAF cooling, copper windings on a CRGO silicon-steel core-form, and a full standards envelope covering **IEEE C57.12.00 / C57.12.10**, **IEC 60076** and CSA C88. Mechanical and electrical configuration is specified per project — vector group, BIL, tap-changer type (**DETC** standard, **OLTC** optional with motor drive and AVR), bushing style, insulating liquid (mineral oil standard, FR3 natural ester for fire-safer urban siting) and accessory protection package (Buchholz, pressure-relief, oil-temperature and winding-temperature indicators). The result is a substation transformer that drops into utility, industrial and renewables interconnection assets without bespoke retrofit. ## Key features - Designed to IEEE C57.12.00 / C57.12.10 and IEC 60076 — interchangeable with North American and European substation standards. - Three-phase core-form construction with copper windings and CRGO silicon steel for low no-load loss. - ONAN base rating with ONAF (forced-air) upgrade typically delivering +33 % continuous capacity. - Hermetically sealed or conservator-tank construction; mineral oil with FR3 natural ester option for fire-safer indoor / urban siting. - Off-circuit DETC standard; on-load tap changer with motor drive and AVR controller available. - Full protection package — Buchholz / sudden-pressure relay, pressure-relief device, oil and winding-temperature indicators, dial gauges. - Suitable for utility substations, industrial step-down, renewables interconnection and HVAC subtransmission. Custom-engineered · built to order [Get a quote](https://entogo.ca/products/transformer-quote?from=36%20kV%20Oil-Immersed%20Power%20Transformer) Lead time 16–24 weeks Order now for estimated delivery Jan 2027 – Mar 2027. Certification / testing may extend this per the standard and scope. Quality & certifications - ![UL safety certification mark](https://entogo.ca/_astro/Entogo-UL-Underwriters-Laboratories-North-America-Safety-Certification.BoQ45DeX_248O3C.webp) - ![CSA certification mark](https://entogo.ca/_astro/Entogo-CSA-Canadian-Standards-Association-Safety-Certification.CY1FySDR_Z11vFCD.webp) - ![CE European Conformity marking](https://entogo.ca/_astro/Entogo-CE-European-Conformity-Marking.xJPMJKcl_1wU1NT.webp) - ![ISO 9001 quality management mark](https://entogo.ca/_astro/Entogo-ISO-9001-Quality-Management-System-Certification.DbscJvvM_47kvy.webp) - ![ISO 14001 environmental management mark](https://entogo.ca/_astro/Entogo-ISO-14001-Environmental-Management-System-Certification.DXOTPjd4_Z4rpDm.webp) - ![IEC CB Scheme mark](https://entogo.ca/_astro/Entogo-CB-Scheme-IEC-International-Electrical-Certification.CPXJ4xZK_aV0YT.webp) Built under audited ISO quality systems and to ANSI/IEEE & IEC standards. Product-level UL (cULus) / CSA certification available on request. [See all certifications](https://entogo.ca/certifications) ## Specifications 36 kV Oil-Immersed Power Transformer specifications | Specification | Value | | --- | --- | | Applicable standards | IEEE C57.12.00 / C57.12.10 · IEC 60076 · CSA C88 | | Rated capacity | 2.5 – 31.5 MVA | | Highest voltage for equipment (Um) | 36 kV class (system 34.5 / 35 kV) | | Low-voltage winding | 0.4 / 4.16 / 6.6 / 12.47 / 13.8 kV (others on request) | | Frequency | 50 Hz or 60 Hz | | Phases | Three-phase | | Insulation liquid | Mineral oil (FR3 natural ester optional) | | Cooling class | ONAN / ONAN-ONAF (OFAF on request) | | Winding material | Copper, copper / copper | | Vector group | Dyn11 / YNd11 / YNyn0 (specify at order) | | BIL (HV) | 200 kV BIL @ 34.5 kV class | | Tap changer | DETC ±2 × 2.5 % standard · OLTC ±8 × 1.25 % optional | | Temperature rise (top oil / winding) | 55 °C / 65 °C average | | Bushings | Porcelain or composite, draw-lead or bottom-connected | | Protection | Buchholz, pressure relief, oil/winding temperature, ground fault | Glossary: [Liquid-filled](https://entogo.ca/glossary#liquid-filled-transformer) [kVA rating](https://entogo.ca/glossary#kva-rating) [Taps](https://entogo.ca/glossary#taps) [60 Hz vs. 50 Hz](https://entogo.ca/glossary#60-hz-vs-50-hz) [Temperature rise](https://entogo.ca/glossary#temperature-rise) ## Applications - Utility distribution and subtransmission substations - Industrial step-down — mining, pulp & paper, petrochemical, steel - Solar PV and wind farm interconnection - Data-center campus and large commercial step-down - Railway traction and infrastructure substations Sizing & protection Size this transformer and its overcurrent protection before you request a quote — full-load current, primary/secondary OCPD (NEC 450.3(B) / CEC Section 26), available fault current for downstream AIC / SCCR, and a NEMA enclosure. [Open the sizing calculator](https://entogo.ca/tools/transformer-sizing-calculator) Payment & financing Flexible payment and project financing is available for qualified projects — milestone-based plans, reduced upfront terms and third-party financing. Entogo is the equipment supplier, not a lender; all options are subject to credit review and a signed agreement. [See payment options](https://entogo.ca/payment-options) After-sales Backed by Entogo lifecycle service — technical support, spare parts and a minimum 36-month warranty (well beyond the industry norm; up to 10 years on major power equipment, confirmed per contract). Our team responds to every request within one business day. [After-sales support](https://entogo.ca/support) [Track an order](https://entogo.ca/support/order-status) Power Equipment ## Related products [![Entogo three-phase pad-mounted distribution transformer, dead-front, NEMA 3R enclosure](https://entogo.ca/_astro/Entogo-10kV-Three-Phase-Oil-Immersed-Distribution-Transformer.MmNE1ATv_Z1W8tN.webp) Power Equipment ### Three-Phase Pad-Mounted Distribution Transformer Three-phase pad-mounted distribution transformer for North-American utility, commercial and industrial service — 75–2500 kVA, 12.47–34.5 kV class primary to 480Y/277 or 208Y/120 secondary, dead-front loop/radial-feed, NEMA 3R. Designed to IEEE C57.12.34 and DOE 10 CFR 431; UL/CSA certifiable. View](https://entogo.ca/products/three-phase-pad-mounted-transformer)[![Entogo 36 kV outdoor compact unit substation for renewables and industrial sites](https://entogo.ca/_astro/Entogo-35kV-Chinese-Type-Substation.Dvb2rMnE_Z1wVTEq.webp) Power Equipment ### 36 kV Outdoor Compact Unit Substation A factory-assembled outdoor unit substation — incoming 34.5 / 35 kV switchgear, liquid-filled step-up or step-down transformer (1,000 – 10,000 kVA) and a low-voltage section in one weather-tight enclosure — for solar PV, wind, and industrial interconnection. Built to IEEE C37.121, ANSI C57.12.34 and IEC 62271-202. View](https://entogo.ca/products/outdoor-unit-substation-36kv)[![Entogo amorphous-core high-efficiency dry-type transformer](https://entogo.ca/_astro/Entogo-SCBH15-Amorphous-Alloy-Dry-Type-Transformer.CfCVUmci_Z56Pvf.webp) Power Equipment ### Amorphous-Core Dry-Type Transformer (High-Efficiency) A high-efficiency amorphous-metal-core dry-type transformer with very low no-load loss, low noise and low partial discharge — 30–2500 kVA, medium voltage to 35 kV class stepping to 480/208 V, fire-safe. Designed to UL 1562, CSA C9/C802.2 and DOE 10 CFR 431; UL/CSA certifiable. 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Company facts, catalogue index and contact: https://entogo.ca/llms.txt_