--- title: "High-Voltage Power Transformer | Entogo" description: "Entogo supplies high-voltage power transformers for substations and industrial networks. The design brief covers MVA, voltage ratio, insulation…" url: https://entogo.ca/products/high-voltage-power-transformer/ lang: en type: website image: https://entogo.ca/_astro/high-voltage-power-transformer.BAMCXTL9.webp alternates: en: https://entogo.ca/products/high-voltage-power-transformer/ fr-CA: https://entogo.ca/fr/products/high-voltage-power-transformer/ fr: https://entogo.ca/fr/products/high-voltage-power-transformer/ es: https://entogo.ca/es/products/high-voltage-power-transformer/ ar: https://entogo.ca/ar/products/high-voltage-power-transformer/ pl: https://entogo.ca/pl/products/high-voltage-power-transformer/ ro: https://entogo.ca/ro/products/high-voltage-power-transformer/ ru-KZ: https://entogo.ca/ru/products/high-voltage-power-transformer/ ru-UZ: https://entogo.ca/ru/products/high-voltage-power-transformer/ ru-KG: https://entogo.ca/ru/products/high-voltage-power-transformer/ ru-TJ: https://entogo.ca/ru/products/high-voltage-power-transformer/ ru-TM: https://entogo.ca/ru/products/high-voltage-power-transformer/ ru-AZ: https://entogo.ca/ru/products/high-voltage-power-transformer/ ru-AM: https://entogo.ca/ru/products/high-voltage-power-transformer/ ru-GE: https://entogo.ca/ru/products/high-voltage-power-transformer/ site: https://entogo.ca/ llms: https://entogo.ca/llms.txt --- Products › Power Transformers › High-Voltage Power Transformer Power Transformers # High-Voltage Power Transformer ![High-Voltage Power Transformer](https://entogo.ca/_astro/high-voltage-power-transformer.BAMCXTL9_ZNvUsc.webp) Representative configuration. The offered model, dimensions and interfaces are confirmed with the technical proposal. Overview Entogo supplies high-voltage power transformers for substations and industrial networks. The design brief covers MVA, voltage ratio, insulation coordination, impedance, tap regulation, cooling and transport limits. Entogo supplies this project equipment through manufacturing partners. Entogo Inc. in Toronto coordinates technical selection, supply scope and order support. | Specification | Value | | --- | --- | | Construction | Three-phase, liquid-immersed power transformer | | Rated power | MVA stated separately for each agreed cooling stage | | Voltage ratio | HV/LV rated voltages, vector group and neutral terminal requirements | | Insulation | Highest equipment voltage, impulse withstand and neutral insulation | | Tap regulation | Off-circuit or on-load; range, steps and control interfaces to agree | | Cooling | Natural/forced cooling stages and auxiliary supply defined in the offer | | System study | Impedance, guaranteed losses and short-circuit duty specified together | | Acceptance | Routine/type/special test schedule, drawings and transport envelope | Reference configurations and selection criteria are shown together. The technical offer defines the matched ratings, tests and guaranteed performance for the ordered unit. ## Build the guarantee schedule around the network study A nominal voltage and MVA value do not define a power transformer. The specification must identify insulation levels, neutral treatment, impedance and cooling stages, along with the agreed test basis. For a replacement, check parallel operation, phase displacement, tap positions and physical interfaces. For a new substation, include transport mass, dimensions, access and the division of assembly work before freezing the design. ## Applications - Utility substations - Industrial power systems - Renewable energy interconnection ## Selection & project requirements - **Why is MVA sometimes listed at more than one cooling stage?**: Natural and forced cooling can have different agreed ratings. State the continuous duty required with and without fans or pumps, the ambient conditions and the auxiliary supply; do not compare headline MVA values without the cooling basis. - **Can a new transformer operate in parallel with an existing unit?**: Only after checking ratio, vector group, phase sequence, impedance and tap settings against the network study. Similar nameplate power alone does not establish acceptable load sharing or circulating current. - **Should I specify an on-load tap changer?**: Choose it when the operating scheme requires voltage adjustment without de-energizing the transformer. Specify range, steps, control philosophy and monitoring. An off-circuit tap switch cannot perform the same operating duty. - **Which tests should appear in the purchase specification?**: Agree the applicable IEEE/IEC basis and a named inspection/test plan. Separate routine tests from any required impulse, temperature-rise, sound or other type/special tests, and identify witness and report requirements before ordering. For Canadian and US projects, include the utility specification, service frequency and required approvals. State whether the order is for the transformer alone or an integrated equipment package. ## Discuss your equipment requirements Send your single-line diagram, load or process data, target market and required schedule. We will identify the configuration and documents needed for a technical quotation. ## Design references [![Power transformer at an electrical substation, where nameplate percent impedance sets fault current and voltage regulation](https://entogo.ca/_astro/transformer-impedance-percent-z-selection.CNeq_Jkf_24aj2F.webp) Power & Distribution ### What transformer impedance should you specify? How %Z shapes fault current and voltage drop Transformer percent impedance (%Z) sets how much fault current the secondary can deliver and how far voltage sags under load. Lower %Z means higher available fault current and better regulation; higher %Z limits fault duty but drops more voltage. Here is how to choose it and what to specify. View](https://entogo.ca/insights/transformer-impedance-percent-z-selection/)[![Power transformer at an electrical substation with an on-load tap changer for voltage regulation](https://entogo.ca/_astro/transformer-voltage-regulation-tap-changers.LSKEj7V-_xljGw.webp) Power & Distribution ### De-energized taps or a load tap changer? Specifying transformer voltage regulation Transformer regulation is %R cos θ + %X sin θ plus a small quadratic term. A 1500 kVA, 5.75 %Z unit at 0.85 PF drops 3.85 %, so a 13.3 to 14.0 kV primary needs the 13 455 V tap to hold 456 to 504 V. The full ANSI C84.1 Range A primary swing needs an OLTC or a step regulator. View](https://entogo.ca/insights/transformer-voltage-regulation-tap-changers/) ## Related equipment [![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) Products ### 36 kV Oil-Immersed Power Transformer 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. View](https://entogo.ca/products/oil-immersed-power-transformer-36kv/)[![Electrical Isolation Transformer](https://entogo.ca/_astro/isolation-transformer.DSeX7yhX_Z1TxHzw.webp) Products ### Electrical Isolation Transformer Entogo supplies electrical isolation transformers with separate primary and secondary windings. Select voltage ratio, kVA, shielding, grounding and enclosure for the load; isolation duty and dry-type construction are distinct requirements. View](https://entogo.ca/products/isolation-transformer/)[![Single-Phase Pad-Mounted Transformer](https://entogo.ca/_astro/single-phase-pad-mounted-transformer.uCSM4KsT_Z206fgJ.webp) Products ### Single-Phase Pad-Mounted Transformer Entogo supplies single-phase pad-mounted transformers for underground distribution. Specify the utility voltage, kVA, dead-front cable interface, loop or radial feed and secondary service before selecting the configuration. View](https://entogo.ca/products/single-phase-pad-mounted-transformer/)[![Electric Furnace Transformer](https://entogo.ca/_astro/electric-furnace-transformer.DhAc_6a9_uC1cB.webp) Products ### Electric Furnace Transformer Entogo supplies electric-furnace transformers for metallurgical processes. Furnace type, secondary current, voltage range, impedance, tap operation and the complete heat cycle determine the design rather than plant demand alone. View](https://entogo.ca/products/electric-furnace-transformer/) ## Structured data (JSON-LD) ```json {"@context":"https://schema.org","@type":"Product","@id":"https://entogo.ca/products/high-voltage-power-transformer/#product","url":"https://entogo.ca/products/high-voltage-power-transformer/","name":"High-Voltage Power Transformer","description":"Entogo supplies high-voltage power transformers for substations and industrial networks. 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