General information
Complete block-modular transformer substation KTBM (КТБМ) 35/0,4 kV is an outdoor substation in an insulated block-container module (or a modular building made of sandwich panels), designed to receive three-phase alternating current electrical energy at a frequency of 50 Hz and a voltage of 35 kV and convert it to a voltage of 0,4 kV. The KTBM is used for power supply to industrial, utility and agricultural facilities, as well as facilities commissioned in stages — solar and wind power plants, construction sites.
Structurally, the KTBM is assembled from unified, insulated, fully factory-ready modules: a 35 kV indoor switchgear module (vacuum circuit breaker, type — project-specific; LK Energy Group uses only vacuum switching, without gas insulation), a power transformer module, and a 0,4 kV switchgear module (RU-0,4). The modules are equipped with electric heating, lighting, ventilation and fire and security alarm systems. This layout makes it possible to eliminate intermediate 6(10) kV switchgear, shorten installation time and, if necessary, dismantle and relocate the substation to another site.
The 35 kV design was developed by LK Energy Group and confirmed by installation experience; it is manufactured to order. Electrical parameters (transformer power and quantity, rated currents and busbar cross-section, short-circuit currents and levels of electrodynamic and thermal withstand strength, composition of HV cells and RU-0,4) are determined individually for each project according to the technical assignment (TOR) and TU U 27.1-40132794-004:2017. LK Energy Group is a switchgear manufacturer based in Odesa.
Main characteristics:
| Parameter | Value |
|---|---|
| Design / supply | developed, installation experience available; made to order |
| Rated HV voltage, kV | 35 |
| Rated LV voltage, kV | 0,4 |
| Power transformer rating | project-specific / per TOR |
| Number of power transformers | project-specific / per TOR |
| Rated current of LV busbars, A | project-specific / per TOR |
| Short-circuit currents, withstand strength (Icw / Icu / Ipk) | project-specific / per TOR |
| Climatic design | project-specific / per TOR |
| 35 kV switching equipment | vacuum (without gas insulation), type — project-specific |
| Design | factory-ready block-container modules, outdoor installation |
| Regulatory document | TU U 27.1-40132794-004:2017 |
Description and Purpose
KTBM 35/0.4 kV is a complete block-modular transformer substation (package substation) for the 35 kV voltage class: a power transformer up to 4000 kVA housed in factory-insulated modules (35 kV switchgear, transformer, 0.4 kV low-voltage switchgear) for receiving 35 kV and converting it to 0.4 kV. It suits small industrial, utility and agricultural consumers, solar power plants and facilities where an intermediate 10(6) kV switchgear needs to be eliminated. LK Energy Group is a switchgear equipment manufacturer from Odesa (company since 2005, own factory since 2015): the 35 kV solution is our own design, and we have installation experience; units are manufactured to order per project/technical specification. Switching is vacuum-based (SF6 gas-insulated devices are not used).
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KTBM for 35 kV Voltage
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