The K-104 line is a modern generation of metal-clad 6-10 kV medium-voltage switchgear focused on maximum configuration flexibility and a short commissioning cycle. The panels receive, distribute, and switch three-phase 50 Hz power in networks with an isolated or compensated neutral, providing selective interruption of short-circuit currents up to 31.5 kA. The design is modular: all cubicles share the same overall dimensions and component platform, except cable feeder panels whose depth is increased by 170 mm to accommodate four cables of 3 × 240 mm². This unification simplifies the engineering of single-row and L-shaped indoor switchgear rooms and shortens manufacturing time for series deliveries.

The enclosure is made of sheet steel with an aluzinc (AZ150) coating; joints use structural blind rivets rated for dynamic loads up to 6 kN. Each panel is divided into the medium-voltage (primary), busbar, cable, and relay/control compartments, separated by solid 2 mm partitions. Internal-arc overpressure is vented through dedicated exhaust ducts that direct hot gases upward, protecting operating personnel. A glass-reinforced polyester shutter system automatically covers the primary receptacles when the breaker is racked out, while mechanical and electrical interlocks prevent incorrect operations in line with IEC interlocking principles.

The primary equipment is based on 12 kV vacuum circuit-breakers to IEC class M2/E2/C2 with a mechanical endurance of 30,000 cycles. Motor operators for the circuit-breaker and earthing (grounding) switch are available for integration with remote SCADA and smart grid systems. Secondary wiring runs in shielded cable ducts with single-point grounding to minimize HF interference; mounting provisions are prepared for IEC 61850 Ed. 2 IEDs to streamline deployment of digital protection and telecontrol.

Installation is detail-oriented: cable entry is possible from the top, bottom, or externally (options A/B/C), with the option letter indicating entry direction in the BOM. For space-constrained MV rooms, two-sided maintenance with an 800 mm rear aisle is supported. All primary contacts are positioned at 900-1100 mm height to ease torque checks. Average assembly labor per cubicle is just 12 man-hours versus 18 man-hours for the previous generation, and the yearly monitored availability factor K_gt = 0.998 on pilot sites.

Standards and type tests:

• IEC 62271-200 - Internal Arc Classification IAC AFL 31.5 kA / 1 s;
• IEC 62271-100 - 12 kV vacuum circuit-breakers, class M2/E2/C2;
• IEC 62271-102 - earthing switches with mechanical endurance of 5,000 operations;
• IEC 60071-1 - insulation coordination: LI 75 kV / SI 42 kV (standard level);
• EN/IEC 60721-3-3 - environmental conditions for stationary indoor use; EN/IEC 60529 - degree of protection IP31 (option IP41).

Scope of use

K-104 panels are installed in permanent indoor switchgear rooms and factory-built modular e-houses across various facilities:

• 6-10 kV package substations for urban and industrial networks;
• auxiliary medium-voltage switchgear of thermal power plants, CCGT blocks;
• plant substations: metallurgy, chemicals, pulp & paper, agro-clusters;
• pumping stations, public utilities, data centers;
• retrofit of legacy KSO-366 / KRUN-6 line-ups without building rework.

Technical data

Documentation for manufacturing K-104 switchgear

Tender package. Technical description, single-line diagrams, and inquiry sheets for procurement.

Working drawings & 3-D models. Layouts, BOMs, secondary schematics, and cable schedules.

Contract manufacturing of assemblies. Outsourcing of assemblies and parts with quality oversight.

Adaptation to existing equipment. Drop-in replacement cubicles for matching legacy busbars.

Why work with us

No headcount growth. Documentation is clear for engineers of average qualification.

No pilot prototypes. Proven assemblies and typical solutions compress lead times.

24/7 support. Assistance with assembly, commissioning, and digital integration.

Questions? Email inbox@proekt-energo.com

PDF - K-104 Technical Information

KYN-28A is an upgraded line of metal-clad switchgear cubicles for power distribution, sectionalizing, and protection of 6-10 kV medium-voltage networks (50 Hz). The switchgear collects and distributes power at primary substations, plant substations, and infrastructure supply centers; it also serves as a platform for station-service (auxiliary) panels and revenue-metering cubicles. Schemes are suitable for systems with both an isolated and a compensated (resonant-grounded) neutral.

The "A" revision features reinforced arc-gas exhaust, optimized busbars, and a dedicated mounting area for digital IEDs per IEC 61850 Ed.2. The VCB truck (vacuum circuit-breaker) can be racked to the test/service position within 60 s by a single operator without de-energizing adjacent sections. The front door uses twin-seal gaskets that prevent hot-gas ejection during an internal arc fault.

The enclosure is made of galvanized steel with an Aluzinc coating; external panels are powder-coated to RAL 7035. Structural blind rivets maintain geometry and provide high shear strength, which is critical under internal short-circuit stress.

Standards and compliance

• IEC 62271-200 - type-tested, internal arc classification IAC AFL up to 31.5 kA;
• IEC 62271-100 - vacuum circuit-breakers up to 12 kV;
• IEC 62271-102 - earthing switches with spring operating mechanism;
• IEC 60071-1 - insulation coordination (levels and test withstands);
• EN/IEC 60721-3-3 - environmental conditions (replaces GOST 15150 U3/T3); IEC 60529 - IP 31/41 (higher on request).

Where KYN-28A is used

• 6-10 kV MV switchgear at 110/35 kV substations and industrial main substations;
• Diesel/gas-engine plants, CHP & mini-CHP, and renewable power evacuation nodes;
• Water-treatment plants, metro systems, airports, data centers, logistics hubs;
• Replacement/upgrade of legacy KSO/GIS lineups with adapted buswork and cable entries;
• Revenue metering and precision measurement points in medium-voltage networks.

Service conditions

• Indoor heated rooms at -25 ... +40 °C; below -25 °C, switchroom heating is mandatory;
• Altitude ≤ 1000 m; above this, apply insulation/cooling recalculation (derating);
• No explosive atmospheres and no conductive dust (per EN/IEC 60721-3-3 conditions);
• Mechanical stress per EN/IEC 60721-3-3; vibration resistance 0.5 g in the 1-30 Hz range;
• Standard IP 31; IP 41 or IP 54 available on request.

Design features

• Four-compartment layout: busbars · circuit-breaker · cable · protection/auxiliaries;
• Arc-gas exhaust ducts with isolated channels and pressure-relief flaps;
• Composite shutters with key interlocking;
• Spring-operated earthing switch with closing force < 150 N for safe manual operation;
• Option: motor operators for the CB and earthing switch for remote SCADA control.

Variants and options

• VCB 630...3150 A, up to 31.5 kA; CTs 5P20 / 10P, cast-resin VTs and ZnO surge arresters;
• Bays: incomer, bus coupler, feeder/line, VT cubicle, busbar bypass;
• Top or bottom cable entry; bus-duct bridges up to 4000 A;
• IEDs with MMS/GOOSE (IEC 61850) and DLMS for revenue metering;
• Arc-flash sensors, temperature tags, video monitoring system.

Reliability and lifetime

• Internal-fault containment ≤ 100 ms; overpressure limited to < 5 kPa;
• CB mechanical endurance - 30 000 operations; enclosure service life - ≥ 25 years without repainting;
• Coating corrosion resistance - 720 h salt-spray (ISO 9227);
• 100% outgoing QC of current-carrying joints (γ-defect ≤ 1 ppm).

Technical data

Documentation and production support for KYN-28A

Tender package. We promptly deliver single-line diagrams, data sheets, and explanatory notes for tenders and technical acceptance by the client.

Working drawings & digital models. We supply 3-D STEP / DWG, bills of materials (BOM), secondary wiring diagrams, cable schedules, and quality certificates for series production at your facility.

Contract manufacturing of assemblies. When needed, we place metalwork, doors, and operating mechanisms with certified partners, leaving final assembly and factory tests with you.

Adaptation to existing equipment. We design equivalent cubicles to "match" third-party busbars and cable entries while preserving the overall substation architecture.

Why it’s beneficial to work with us

No extra headcount. The documentation enables supervision by a mid-level engineer.

Minimal prototyping. We draw on experience from 40+ projects and launch series production without costly prototypes.

Protection & SCADA support. We help integrate IEDs, telemetry, and digital protocols, and prepare SCADA templates.

Contact the technical department: inbox@proekt-energo.com

PDF - KYN-28A Technical Brochure

KYN-61 is a series of 35 kV medium-voltage switchgear panels engineered for transmission and plant distribution networks where reliable interruption of 20-31.5 kA short-circuit currents and system stability under all operating scenarios are required. Compared with 10 kV systems, this voltage level imposes stricter demands on phase clearances, lightning impulse withstand, and vibration resilience in oil & gas applications. The KYN-61 design addresses these factors: the primary circuit uses 40.5 kV vacuum circuit-breakers with a mechanical endurance of 30,000 cycles; the switching chamber is air-insulated with a slight overpressure of about 5 Pa; and the main busbars are mounted on epoxy-composite supports that maintain strength up to +120 °C.

Each panel features a four-compartment layout - busbar, withdrawable circuit-breaker, cable, and relay/control - separated by solid 2 mm steel partitions. Thanks to the cassette-type draw-out module, the “service → test” operation takes < 90 s with no covers removed. A shutter system made of glass-fiber-reinforced polyester reliably closes the primary receptacles when the breaker is withdrawn, preventing access to live parts. The inner face of the doors is coated with an anti-condensation finish that significantly reduces flashover risks due to moisture run-off during rapid temperature changes - a relevant measure for booster pump stations and well-pad substations.

The enclosure is designed for internal-arc verification to IAC AFL 31.5 kA / 1 s: pressure is relieved via rupture panels at the top of the cabinet, directing hot gases strictly upward without affecting adjacent low-voltage circuits. For sites in seismic areas, a reinforced variant with diagonal bracing and heavy-duty bolted joints is available, qualified for intensity 8 (MSK-64).

Digital readiness is implemented in the secondary compartment: the base configuration provides terminal blocks for RS-485 / CAN 2.0, and on request the panel is equipped with an LC-SX optical patch panel and a gateway supporting IEC 61850 Ed. 2. This enables advanced UFLS, arc-flash protection, and digital metering (M-Bus / DLMS) without rework. Primary equipment is protected against aggressive environments: exterior panels use a high-durability polyester powder coat; internal parts receive zinc-nickel plating with Cr(III) passivation, providing 720 h salt-spray resistance per ISO 9227.

Serviceability has been prioritized. A service trolley with adjustable table height and cassette locking is supplied as standard, simplifying handling of breakers up to 260 kg. The spare-parts kit includes quick-fit 35 kV heat-shrink cable terminations and spare shutter drives. By default, two-sided access is provided; where MV rooms are narrow, a front-access version with a reinforced pull-out cable tray is available. These measures ensure a high availability factor K_gt ≥ 0.998 and minimize downtime during scheduled maintenance.

Standards and type tests:

• IEC 62271-200 (up to 52 kV) - type tests incl. IAC AFL 31.5 kA / 1 s;
• IEC 62271-100 - 40.5 kV vacuum circuit-breakers, class M2 / E2 / C2;
• IEC 62271-102 - earthing switches, up to 40 kA, mechanical endurance 5,000 ops;
• IEC 60071-1 - insulation coordination: LI 170 kV / SI 95 kV (standard level);
• EN/IEC 60721-3-3 - environmental conditions for stationary indoor use; typical temperature range -40...+40 °C (project-specific);
• EN/IEC 60529 - degree of protection: base IP31, options IP41 / IP54.

Scope of use

KYN-61 covers the 35 kV segment where high breaking capacity, robust arc protection, and enhanced digital functionality are critical:

• power-export nodes of 110/35 kV field substations in oil & gas;
• bus-section and auxiliary switchgear at CCGT and hydropower plants;
• switchgear rooms of compressor stations on trunk gas pipelines;
• intermediate distribution points on long 35 kV overhead lines with capacitive-current compensation;
• retrofit of legacy KSO-203/204, VK-10-35 cells migrating to vacuum switching.

Technical data

Documentation to launch KYN-61 production

Tender package. Single-line diagrams, inquiry sheets, and an explanatory note for procurement.

Working drawings & 3-D. Layouts, BOM, secondary schematics, and cable schedules - tailored to your facility.

Contract manufacturing of assemblies. We place metalwork and shutter mechanisms with vetted suppliers under quality control.

Adaptation to third-party equipment. We design functionally equivalent panels for compatibility with existing busbars and cables.

Project updates. We implement changes per expert review findings and your plant’s process audits.

Benefits of cooperation

No need to expand staff. The documentation is structured for engineers of average qualification.

Series launch without prototypes. Experience from 40+ projects lets you avoid costly pilot builds.

Consulting 24/7. Support at all stages - from device procurement to commissioning tests.

Questions? Email: inbox@proekt-energo.com

PDF - KYN-61 Technical Brochure

The VM-4 series brings metal-clad switchgear technology to the 35 kV class while preserving the compact footprint and serviceability typical of 10 kV bays. The cubicles are intended for receiving and transferring three-phase power at 50 Hz in systems with an isolated or compensated neutral, provide selective interruption of short-circuit currents up to 31.5 kA, and are designed for daily switching duty. The enclosure is made of steel with an additional Aluzinc AZ-150 coating, delivering over 1,000 h corrosion resistance in a salt-spray chamber. Each cubicle is divided into four isolated compartments, each with its own pressure-relief duct and rupture panels: during an internal arc, gases are vented strictly upward, preventing damage to adjacent LV circuits.

The switching device is a withdrawable 40.5 kV vacuum circuit-breaker (class M2/E2/C2) rated for 30,000 O-C operations and short-circuit currents up to 31.5 kA. The truck can be moved to the service and test positions manually; a motor operator is available for remote substations. Polycarbonate-epoxy shutters automatically cover the fixed contacts when the truck is withdrawn, eliminating exposure to live parts. Secondary wiring is routed in shielded metallic raceways; single-point earthing of shields reduces high-frequency interference and simplifies integration of digital IEDs.

Internal arc resistance is type-tested to IAC AFL 31.5 kA 1 s (IEC 62271-200); during testing, the enclosure maintained its geometry and the temperature on external surfaces did not exceed 240 °C. For high-humidity sites (water utilities, port-area switchrooms) IP 41/IP 54 options are available: additional door seals and ventilating air-locks with heaters keep the dew point below -5 °C. For seismic regions, reinforced anchors and braces are applied, qualified to intensity 8 on the MSK-64 scale.

Protection and control devices are installed in a dedicated relay (LV) compartment: IEDs with IEC 61850 Ed.2 support, station-service transformers, and metering modules with DLMS transport. An LC-to-SC optical patch panel enables direct connection to the fiber backbone without field modifications. For brownfield upgrades, a "cross-layout" is available: VM-4 is built to KSO-366 envelope dimensions but with a vacuum CB and modern interlocks, simplifying retrofits without complete busbar dismantling.

Installation convenience is designed-in. All mounting points are accessible from the front; cable terminations are set at 900 mm above floor level to speed stripping and torque inspection. The spare-parts kit includes heat-shrink lugs, spare springs for the earthing switch, and diagnostic fittings for partial-discharge measurements without taking equipment out of service. The availability coefficient K_gt over a two-year pilot operation was 0.9978, comparable to best-in-class imported 36 kV products.

Standards and testing:

• IEC 62271-200 (up to 52 kV) - type tests to IAC AFL 31.5 kA 1 s;
• IEC 62271-100 - 40.5 kV vacuum circuit-breakers, class M2/E2/C2;
• IEC 62271-102 - earthing switches, mechanical endurance 5,000 cycles;
• IEC 60071-1 - insulation coordination, LI 170 kV / SI 95 kV;
• EN/IEC 60721-3-3 - environmental conditions (replaces GOST 15150 U3/T2); IEC 60529 - IP 31 standard, IP 54 optional.

Applications

VM-4 cubicles are installed in permanent indoor switchrooms or factory-built modular E-houses and are effective in:

• package substations for oil & gas clusters and gas distribution stations;
• station-service boards of TPPs, GTUs, and cogeneration plants;
• industrial substations (metallurgy, chemical, food plants);
• utility network nodes at 35 kV for long overhead-line backup and RES interconnection;
• switchgear for municipal infrastructure, data centers, and airports.

Technical data

Documentation for manufacturing KRU VM-4

Tender package. Questionnaires, single-line diagrams, and technical descriptions tailored to procurement requirements.

Working drawings & 3-D models. Layouts, BOMs, secondary schematics, and cable schedules.

Contract manufacturing of assemblies. We can place fabrication of the enclosure, doors, and shutter mechanism with partner plants when needed.

Adaptation to existing equipment. We design equivalent bays for interfacing with installed busbars.

Why work with us

Lean teams. Documentation is clear for a mid-level engineer.

Serial launch without prototypes. Proven modules reduce risk.

24/7 support. Consulting on fabrication, assembly, and commissioning of VM-4.

Questions? Write to: inbox@proekt-energo.com

PDF - VM-4 Technical Information