Standard Solution: 10 kV KSO Switchgear Cubicles with VV/TEL Breakers and RS83-AV2

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

A ready-made set of Design-stage (Stage P) relay protection and automation schematic diagrams for a section of 10 kV KSO switchgear cubicles built on VV/TEL vacuum circuit breakers (VV/TEL-10/630-20U3) with RS83-AV2 microprocessor-based protection terminals: 34 sheets — two incoming feeders, a bus-section breaker, outgoing feeder lines, a bus-section disconnector with an auxiliary-supply automatic transfer switching circuit (ATS-SN), an inspection sheet, and inter-cubicle wiring connections. The diagrams were developed by LK Energy engineers for an actual reconstruction project of an operating substation (2024). The PDF is freely available below; the DWG set is available on request via the form.

How the VV/TEL design differs

This solution is a variant of our baseline set "10 kV Distribution Point on KSO Cubicles", which explains what a 10 kV distribution point (RP-10 kV) is and when a dual-bus-section scheme is used. Here, the same task is solved on a different hardware platform and for a different scenario:

VV/TEL switching instead of VV-N10

Control and signaling circuits are adapted for the VV/TEL-10/630-20U3 circuit breaker drive.

Reconstruction of an operating substation, not a new distribution point

A compact configuration of 6 KSO cubicles of the KSO-E series (two incoming feeders, two outgoing lines, a bus-section breaker, a bus-section disconnector) across two bus sections.

Auxiliary supply without separate auxiliary-transformer cubicles

OLSPU-2.5-10 U2 auxiliary supply transformers are housed within the incoming-feeder cubicles, while the bus-section disconnector cubicle implements an auxiliary-supply automatic transfer switch (ATS-SN) with insulation monitoring of the auxiliary transformer's secondary circuits.

No commercial metering unit

metering circuits were not provided for in this design. If an AMR/ASKOE (automated commercial electricity metering system) metering unit with voltage-transformer cubicles is required, see the flagship solution.

Technical parameters of the solution

• Rated voltage: 10 kV, two bus sections; 630 A busbars (AD31 5×50)
• Rated breaking current: 20 kA
• Cubicles: KSO series KSO-E, busbar and line disconnectors RR/EL-RR-OZ-10-630(1000)-25U2
• Switching: VV/TEL-10/630-20U3 vacuum circuit breakers
• Protection: RS83-AV2 microprocessor-based terminals
• Measurement: TOLU-10 current transformers with 0.5S/10P windings (300/5 for incoming feeders and the bus-section breaker, 200/5 for outgoing lines), TZLU-125-1 30/1 zero-sequence current transformers on outgoing lines
• Overvoltage protection: OPN-10/12/10/550 UHL1 surge arresters
• Auxiliary supply: OLSPU-2.5-10 U2 auxiliary transformers in incoming-feeder cubicles + ATS-SN
• Control circuits: control and signaling at ~220 V 50 Hz, compartment lighting at ~36 V
• Year developed: 2024, Design Stage (Stage P), diagram language — Ukrainian, format DWG (AutoCAD)
• Parameters of a specific implementation (rated currents, cubicle types) are agreed upon via the inspection sheet

Set contents and downloads

The sections for breaker cubicles contain schematic diagrams of protection and measurement circuits, control and signaling circuits, compartment lighting circuits, and an explanatory single-line diagram.

• Full set in a single PDF (34 sheets)

Diagram previews

DWG set on request

We will send the full DWG set (7 files: Incoming Feeder 1, Incoming Feeder 2, bus-section breaker, outgoing line, bus-section disconnector, inspection sheet, inter-cubicle connections) to your email free of charge.

Frequently asked questions

How does this solution differ from the VV-N10 design?

The baseline protection and automation circuit design on RS83-AV2 terminals is the same, but the control circuits are adapted for the VV/TEL vacuum circuit breaker drive, the configuration is more compact (6 cubicles for reconstructing an operating substation), and auxiliary supply is implemented using OLSPU auxiliary transformers with ATS-SN instead of separate auxiliary-transformer cubicles. The full baseline set on VV-N10 (108 sheets, with voltage transformers and an AMR/ASKOE metering unit) is available on the flagship solution page.

Can these diagrams be used in a working design project?

Yes — as a standard baseline solution. Site-specific adaptation, relay protection setting calculations, the cable schedule, and compliance with the applicable PUE (electrical installation rules) / DSTU (Ukrainian national standards) are the responsibility of the design engineer. The diagrams correspond to an actual reconstruction project for an operating substation, developed in 2024.

How can I get the DWG files?

Fill out the form on this page — we will send the DWG set to your email within one business day.

Does LK Energy manufacture KSO cubicles to these diagrams?

Yes. We manufacture KSO/KRU switchgear cubicles, RUNN low-voltage distribution cabinets, and ShchO-90 panels at our own production facility in Odesa — over 3,000 units of equipment manufactured since 2015. We can help adapt the solution and fill out the inspection sheet: +38 067 104 94 91.

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