Entogo
Distribution Transformers
Choose by phase, installation and network connection.
Start with the utility connection and installation: a single-phase pad-mounted unit, a three-phase transformer and a complete pole-mounted package serve different layouts. Include service voltage, secondary voltage, kVA, phase arrangement, protection and the utility specification in the inquiry.
Distribution Transformers
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.
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Distribution Transformers
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.
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Distribution Transformers
Single-Phase Overhead (Pole-Mounted) Distribution Transformer
Single-phase overhead pole-mounted distribution transformers for North American utility lines — 10 to 167 kVA, 7200 / 12470GrdY / 24940GrdY primary to 120/240 V secondary, conventional or completely self-protected (CSP). Designed to IEEE C57.12.20 and DOE 10 CFR 431 efficiency, 60 Hz; UL / CSA certifiable.
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Distribution Transformers
Combined Pad-Mounted Transformer (Integrated MV Switching)
Combined pad-mounted transformer integrating the medium-voltage load-break switch, fuse protection and low-voltage distribution with the transformer in one tamper-resistant tank — 75–2500 kVA, 15/25/35 kV class, 60 Hz. Designed to IEEE C57.12.34/.28; UL/CSA certifiable.
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Distribution Transformers
Overhead Distribution Transformer Set (Pole-Mount Package)
A complete overhead pole-mount distribution package — transformer, fused cutout, lightning arrester, secondary/metering pedestal, jumpers and hardware — engineered to a single 15 kV class, 60 Hz specification. Transformer designed to IEEE C57.12.20 and DOE 10 CFR 431; UL/CSA certifiable.
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Design references
Power & Distribution
How to size a transformer: a practical guide to kVA selection
How to convert a real electrical load into the right transformer kVA: the calculation, the standard ANSI/IEEE rating ladder, and the margins for continuous duty, future growth, ambient and altitude that sit between calculated load and nameplate.
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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.
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Standards & Compliance
How do transformers get approved for use in Canada?
Before a transformer can be energised in Canada, the Canadian Electrical Code requires it to be "approved" — either certified by an SCC-accredited body (a CSA, cULus or cCSAus mark) or field-evaluated to CSA SPE-1000. A US-only "UL Listed" mark is not enough. Here is how the approval system actually works.
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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.
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