Standard Solution: 6 kV KTP and KRP Package Substations for a Solar Power Plant (1 MW Block)

Published: 11.06.2026 · Author: Engineering Department, LK Energy Group

Standard solution for power evacuation from an industrial solar power plant: a block-type KTP-1250 kVA package substation (KTP — complete transformer substation; photovoltaic array of roughly 1 MW) and a 6 kV KRP (switching and distribution point) on seven KRUN-E-6/630 cells — incomer, four solar plant feeders, a voltage transformer, and a station-service transformer. The solution is based on an actual industrial solar power plant project with a capacity of 4.95 MW (2025). Questionnaires are freely available below; the DWG package of protection-relay schematics is available free of charge after a short registration.

How power evacuation from a solar power plant works through block-type KTP substations

The inverters of the photovoltaic array deliver power to the 0.4 kV side of the block-type KTP package substation for the solar power plant. A 1250 kVA transformer steps the voltage up to 6(10) kV, and the 6 kV switchgear (RU-6 kV) on KSO-E cells (KSO — cabinet-type switchgear) transmits it via cable lines to the KRP — the switching and distribution point of outdoor design on KRUN-E cells, which collects the feeders from the plant's block-type KTP substations and delivers power to the point of connection. The 4.95 MW plant has several such block-type KTP substations — the solution scales to any number of ~1 MW blocks.

This standard solution covers two nodes at once for the design engineer: the transformer substation for a solar power plant (block-type KTP with 0.4 kV and 6 kV switchgear) and the collection point for power evacuation (6 kV KRP), complete with protection-relay schematics and a commercial metering (ASKOE — automated commercial electricity metering system) node.

Technical parameters of the solution

• Block-type KTP: 1250 kVA transformer, 6(10)/0.4 kV — for an array of ~1–1.25 MW
• 6 kV switchgear of the KTP: KSO-E-10/630-393V cells, VV/ES-12-25/1250 vacuum circuit breaker
• 6 kV KRP: 7 KRUN-E-6/630 cells (KRN3-10 enclosure) — incomer, feeders No. 1–4, VT, station-service transformer
• Switching: RVZ/RVZP-10/630 disconnectors; protection via RS83-AV2 terminals
• Metering and telemetry (ASKOE): GAMA 300 meters, MCL 4.5 data acquisition unit, PLA33 network analyzers, RS-485 / GPRS-3G interfaces
• Year of development: 2023–2025 (project for the completed 4.95 MW solar power plant), schematics language — Ukrainian
• Ratings for a specific implementation are agreed upon via the questionnaire

Package contents and downloads

Preview

DWG package after registration

You get the full DWG package of protection-relay schematics free of charge after registration: 6 kV KRP (incomer, feeders No. 1–4, VT, station-service transformer, questionnaire, cable schedule) and schematics of the block-type 6/0.4 kV KTP (incomer, transformer protection, feeder, 0.4 kV switchgear). Registration takes your name, phone and e-mail.

Frequently asked questions

These schematics are provided as a reference standard solution. Site-specific adaptation, protection-relay setpoint calculations, and compliance with applicable regulations (PUE, DSTU, DBN — state building codes) are the responsibility of the design engineer. LK Energy Group is not liable for application of the solution without adaptation to the conditions of a specific site.