Standard Design: PSTS (Pole-Mounted Transformer Substation) 10/0.4 kV

Published: 12.06.2026 · Author: Engineering Department, LK Energy LLC

A starter documentation set for designing a pole-mounted (mast-type) transformer substation PSTS 10/0.4 kV: single- and double-pole layouts with overall dimensions, an inquiry sheet template with a single-line diagram (HV + LV), an inquiry sheet based on a real order for a PSTS1-63kVA 10/0.4 U1, and two schematic diagrams of the 0.4 kV LV switchboard cabinets (100 A metered incomer and 400 A incomer for two PSTS units). The layout and template are from LK's factory catalog of standard drawings; the rest are from real 2022 orders. PDFs are freely available below; the DWG set for the real orders (PSTS1-25/63, PSTS2-100/160) is available on request via the form.

What a PSTS is and when to choose it over a KTP

A pole-mounted transformer substation (PSTS) is a 10/0.4 kV transformer substation whose equipment is mounted directly on a pole of a 10 kV overhead line or on a separate structure of one or two poles. In design practice you will also encounter the names "mast substation" and "single-pole/double-pole TS" (hence the indices PSTS1 and PSTS2). Unlike a kiosk-type KTP (package transformer substation), a PSTS does not require a separate building foundation or a fenced site — only standard pole embedment in the ground (pole foundation, item 8 in the layout): the power transformer, high-voltage fuses and surge arresters are mounted on the pole, while the 0.4 kV LV switchboard cabinet with the metering unit is mounted at a height convenient for servicing.

The PSTS 10/0.4 circuit is extremely simple: incoming supply from a 10 kV overhead line, protective devices on the 10 kV side, a power transformer, a cable drop into the LV switchboard with an incoming breaker, metering and outgoing group lines. A PSTS is chosen over a KTP when the load is small (LK Energy's 2021-2026 order archive shows ratings from 25 to 160 kVA), the consumer is remote — a farm, a pumping station, a village street — and budget and schedule are tight: fewer metal structures, no separate foundation to build, faster installation. When higher power, two transformers or an ATS (automatic transfer switch) are needed, a kiosk-type KTP is used instead.

Technical parameters: 2022 order example and the standard catalog range

• Design: single-pole transformer substation PSTS1-63kVA 10/0.4 U1
• 10 kV side: power fuses PT 012-10-40-31.5 U1, surge arrester OPNp-10/12
• Power transformer: TMG-63, 10/0.4 kV, D/Yn-11 vector group
• 0.4 kV side: 380 V, 100 A incomer; busbars and PEN — copper PV-3 25 mm²; 0.38 kV surge arrester
• LV switchboard: incoming-metering panel + distribution panel; incoming breaker FMC2/3U 3P 100A 35kA (8-12In), group breakers VA47-29 1P/3P 10-40 A (4.5 kA, C characteristic)
• Metering: GAMA G3B.144.230.F47 meter + MCL 5.10 communication module; internal cabinet lighting
• 0.4 kV LV switchboard variant with a 400 A incomer (per order documentation — supply from two PSTS units): FMC4Ei 3P 400A H 85kA incomer, outgoing FMC3E 3P 200A / FMC2E 3P 160A / FMC2E 3P 100A (50 kA), RB-4-400A disconnector, T-0.66 400/5 class 0.5 current transformer
• Year designed: 2022, stage P (working drawings); original format DWG (AutoCAD)
• Standard range per LK's factory catalog: PSTS 25-250 kVA, PSTS1 (single-pole mounting) / PSTS2 (two-pole mounting) designs
• Pole-mounted layout composition (items 1-8): pin insulators, disconnector support frame, arresters, high-voltage fuses, power transformer, LV switchboard cabinet, reinforced-concrete pole, pole foundation
• Equipment nomenclature and specific designs are finalized at order time — per the inquiry sheet

Package contents and downloads

Sheets 4-6 are from LK's factory catalog of standard drawings (original language Russian; current orders are issued in Ukrainian). The catalog sheets show the classic layout with a disconnector and arresters (RVO/RVN); in current orders we use surge arresters instead of the older arresters — the final configuration is determined by the inquiry sheet.

Preview

DWG on request

Original working drawings from real 2021-2026 orders — inquiry sheet, LV switchboard diagrams, layouts for PSTS1-25/63 and PSTS2-100/160 designs — in DWG (AutoCAD) and CDW (Kompas) formats, sent to your email free of charge.

Frequently asked questions

How does a PSTS differ from a KTP?

A PSTS is mounted on a pole, without a separate substation foundation and without fencing — it is usually the most economical way to step down a 10 kV line to 0.4 kV for small consumers. A KTP is a separate cabinet/kiosk on a building foundation, for higher loads and multiple outgoing lines.

What PSTS ratings does LK Energy manufacture?

The standard range per the factory catalog is 25-250 kVA. The most common designs in recent years are single-pole PSTS1 units at 25 and 63 kVA and double-pole PSTS2 units at 100 and 160 kVA. The specific design is determined by the inquiry sheet.

What is included in the PDF package, and what isn't?

Openly available: the PSTS1/PSTS2 pole-mounted layouts, an inquiry sheet template with a single-line diagram (HV + LV), a completed inquiry sheet example for 63 kVA, and two LV switchboard diagrams. Editable working DWG drawings from real orders are available on request.

How do I get the DWG files?

Fill in the form on this page or write to us via the contacts page — we usually send the package to your email within 1-2 business days.

Does LK Energy manufacture PSTS and LV switchboard units to these diagrams?

Yes. We manufacture LV switchboard cabinets, panel equipment and metal structures in-house in Odesa; we also help designers select equipment and complete the inquiry sheet: +38 067 104 94 91.

These diagrams are provided as a reference standard design. Site-specific adaptation, protection setting calculations and compliance with current codes (PUE, DSTU (Ukrainian national standards), DBN (state building codes)) are the designer's responsibility. LK Energy is not liable for use of this design without adaptation to the conditions of a specific site.