KRU KU-10S is a modular medium-voltage panel system for receiving, distributing, and switching three-phase power at 6 and 10 kV and 50/60 Hz. The panels are designed for systems with an isolated neutral as well as neutrals earthed via an arc-suppression reactor (or a resistor as specified) and are applied in indoor substations, at industrial facilities, and across infrastructure sites.

The mechanical basis is a self-supporting enclosure made of formed steel panels joined by high-strength blind rivets, without welding. This minimizes heat-induced distortion during assembly and maintains stable cabinet geometry. 2 mm aluzinc-coated sheets form a robust, corrosion-resistant frame. Front and rear doors are finished with polyester powder paint (standard RAL 7035, other colors on request) providing high resistance to mechanical and climatic impacts.

Scope of application

KU-10S is recommended for distribution nodes at generation and consumption facilities:

• Indoor MV switchgear of package substations, distribution points, and main step-down substations (6-10 kV) on industrial and infrastructure sites;
• auxiliary switchgear of power plants; substations of transmission and generation companies;
• oil & gas, mining, chemicals, metallurgy, utilities, data centers, and pumping stations;
• retrofit projects integrating with existing busbars and cable routes.

Structure and layout

Each panel is divided into four independent compartments with solid vertical and horizontal barriers, increasing overall rigidity and ensuring fault compartmentalization:

• cable compartment (feeders, CTs, surge arresters, earthing switch);
• auxiliary/low-voltage compartment (P&C, metering, controllers, terminal blocks);
• busbar compartment (air insulation, bushing/post insulators);
• switching compartment (withdrawable cassette/truck with the primary apparatus).

The partition between the switching and cable compartments is quick-removable, reducing service time. MV-compartment doors made of 2.5 mm sheet steel use hinges and latches rated for impulse loads under internal-arc conditions; the switching-compartment door has a viewing window and an emergency breaker-trip handle.

Withdrawable cassette (truck)

The cassette is a truck with an operating mechanism and mounting interfaces for the panel’s function: vacuum circuit-breaker/contactor, disconnector, VT with fuses, auxiliary service transformer, etc. Three fixed positions are provided: service (racked-out), test, and service/maintenance (on a handling trolley). Travel between "test" and "service"/"in-service" is via a worm drive with the door closed; the position is indicated on the front mimic. Stationary primary contacts are protected by an automatic shutter mechanism with padlocking provision.

Safety and internal-arc robustness

• confinement of internal-arc effects within a single compartment;
• comprehensive mechanical/electrical/key interlocks per safety logic;
• truck movement is permitted only with the front door closed;
• degree of protection of the switching compartment with door open - IP21 (shutters closed);
• inspection windows for visual control of operations;
• pressure-relief flaps/plenums at the top of MV compartments for directed venting;
• voltage-presence indication on feeder and busbar circuits on the front panel.

Options, digitalization, and services

• motorized drives for the cassette truck and earthing switch for remote TEST/SERVICE and ON/OFF operations;
• arc-flash protection (fiber-optic sensors/arc relays) with high-speed tripping;
• online thermal monitoring of bolted joints; breaker operation counters;
• video surveillance inside compartments (breaker, earthing switch) with display at HMI/SCADA;
• truck interchangeability and spare cassettes, handling trolleys, and spare-parts kits.

Standards compliance

• IEC 62271-200 (metal-enclosed switchgear up to 52 kV), IEC 62271-1 (common requirements);
• IEC 62271-100 (circuit-breakers), IEC 62271-102 (earthing switches);
• IEC 61869-2/-3 (CTs/VTs), IEC 60529 (degrees of protection, IP);
• IEC 61000-6-2/-6-4 (EMC for industrial environment), IEC 60068-2 (environmental/mechanical tests).

Technical data

We offer documentation for manufacturing KRU KU-10S:

• Pre-tender technical package (single-line diagrams, data sheets, technical description);
• Manufacturing drawings, 3-D models, and the complete production dossier for in-house KU-10S assembly;
• Organization of contract manufacturing of subassemblies with partners; you perform assembly, wiring, and routine factory tests;
• Document adaptation to project requirements and your plant’s process capabilities;
• Transition/interface panels for integration with third-party equipment and existing switchgear.

Why work with us:

• No need to maintain a large senior engineering staff: the package is clear to a mid-level engineer;
• Series launch without prototypes thanks to standardized modules and field-proven solutions;
• Technical support for assembly, commissioning, and P&C/SCADA integration, plus guidance on KU-10S manufacturing nuances.

For more information on KRU KU-10S contact: inbox@proekt-energo.com

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