The PD-14 drive is intended for motor-operated control of main blades and earthing switches of disconnectors for voltage classes from 35 to 220 kV when installed outdoors, and from 10 to 110 kV for indoor installations. Drives are manufactured in accordance with GOST 689-90, UHL category 1 per GOST 15150-69 and GOST 15543-89.
Structurally, the drive is built as modules comprising a gear unit (BR) and control & indication units (BU).
The PD-14 drive consists of the following main parts:
– cabinet with swing-out panel,
– motor with gearbox,
– mechanical interlock for manual operation,
– KSAM12 switching unit.
PD-14 drives for operating the main blades and for operating earthing switches share the same design. Drives intended for earthing-switch operation have a red stripe on the door.
The cabinet is a bolted structure made of stainless-steel profiles, additionally sealed with silicone sealant. The design provides access to control/indication devices, the motor-gear unit and terminal blocks from three sides: via the door and removable side covers.
The side covers are fastened to the cabinet with nuts. Removing the covers provides access to the terminal blocks and gear trains. The inner surfaces of the door and covers have silicone-rubber gaskets that protect the cabinet interior from dust and moisture when closed.
The door is mounted on hinge pins and opens up to 170°.
Sealed cable glands are installed in the cabinet base and sized for cables Ø18–25 mm. For smaller cable diameters, increase the effective diameter by wrapping PVC insulation tape in the gland area.

The control units (BU) are designed for remote control of PD-14 drives for phase-by-phase and three-phase operation of disconnectors. BU can be installed both indoors and outdoors.
The cabinet is a bolted stainless-steel structure additionally sealed with silicone. The design provides access to control/indication devices and terminal blocks via the door. The inner door surface is gasketed with silicone rubber to protect the interior from dust and rain when closed. The door is hinged to open up to 170°. The door has a lock operated by a special key. A padlock can be fitted to the lock bushing.

Technical data

Purpose and application

The PD-14 electric drive (UHL1) is a universal solution for automated and remote control of disconnectors in outdoor yards and indoor switchgear for medium-voltage (MV) systems of 35–220 kV (outdoor) and 10–110 kV (indoor). The drive is adapted for both main blades and earthing switches of single- and three-pole disconnectors (incl. RDZ, RG and others), ensuring precise positioning, latching of end positions “ON/OFF”, and high repeatability of operating time and rotation angle.

Applications include distribution substations of grid utilities, generation sites (HPP, TPP, renewables), industrial substations (oil & gas, mining & metallurgy, chemical), as well as transport and municipal energy facilities. Within SCADA/automation systems the drive supports remote commands, interlocks and status signaling, phase-by-phase and three-phase operation, and compatibility with typical substation control schemes.

Mechanical interchangeability with a wide range of domestic and foreign disconnectors simplifies retrofit of existing switchgear and reduces reconstruction costs. Where required, the drive can be supplied with linkage rods and levers tailored to the specific kinematics of the apparatus, minimizing on-site installation time.

Service conditions

The drive is delivered in UHL placement category 1. Corrosion-resistant cabinet materials and internal heating allow operation under high humidity and dust, in rain and melting precipitation. Door and gland sealing prevents ingress of moisture and dust. Vibration and wind loads typical for open-air substations are accounted for in fasteners and strength calculations. On request, versions are available for atmospheres with increased corrosivity (marine/coastal, industrial emissions), as well as special versions for high-altitude sites (reduced partial discharge activity) and tropical climates.

Layout and design solutions

The PD-14 is a rigid mono-block cabinet built on stainless profiles with powder-coated outer panels for long-term service in aggressive environments. Inside are the motor-gear assembly, cam mechanism with discs and pushers for commands and interlocks, terminal blocks for power and control circuits, logic devices, heaters and temperature/humidity sensors. Harness I/O is simplified by conveniently placed terminals, and the swing-out panel provides rapid service without cabinet removal.

The gear unit delivers high output torque with compact dimensions; the kinematics are designed for stable operation at 90° and 190° with re-adjustment possible to match the disconnector. The output shaft has a setting scale and locking features for precise angular positions. The gear ratio is chosen to ensure reliable starting and operation at reduced supply voltage and low ambient temperature.

The motor-gear unit is equipped with a manual override (handle/flywheel) with automatic interlocking - simultaneous motor and manual operation is excluded. End-position limit switches and/or non-contact sensors are used; “Open/Closed/Earthed” positions are read by the signaling circuit and brought to terminals. The front panel has local controls (ON/OFF push-buttons), local/remote selector, power and alarm indication, key lock, and a viewing window for position tags.

Cable glands are sized for Ø18–25 mm; smaller diameters are sealed by wrapping insulation tape. Cabinet compartments use silicone-rubber gaskets. Side covers provide easy access to drive trains and terminals - this speeds inspections and scheduled maintenance and reduces service downtime.

Safety and interlocks

The interlock system prevents mal-operations and ensures safe staff access:

• Mechanical interlock between manual and motor operation - with the handle inserted, the motor drive is disabled; when the motor is engaged, the handle is automatically locked.
• Door and lock contacts - when the door is open, operating commands are blocked and “Door open” alarm is generated; a padlock can be fitted to the lock bushing.
• Kinematic interlocks “disconnector ↔ earthing switch” - prevent closing the earthing switch when the disconnector is closed and vice versa (implemented mechanically and electrically).
• Limit switches and cam contacts - form reliable signaling and interlocking circuits for integration with SCADA and protection & control.
• Electrical protections - heating and temperature control, supply monitoring, fuses/circuit-breakers for power circuits.

Versions and options

Given the diversity of disconnectors, the PD-14 is offered in several versions with options:

• Output-shaft rotation: 90° / 190° (adjustable stops, cam sets).
• Motor-gear units with various power ratings (0.18–0.25 kW) and travel times (5 or 10 s) - selected to the apparatus torque.
• Auxiliary contacts extension: base set (NO+NC) 12+12, additional groups available.
• Heating: automatic (thermostat-controlled) and constant anti-condensation; control via temperature/humidity sensors.
• Enclosure ingress protection for outdoor use - typical IP54; on request higher IP ratings, anti-vandal versions, extra hoods/screens.
• Interfaces: dry contacts, relay outputs; integration with BU cabinets, option for a remote BU for phase-by-phase/three-phase operation.
• Scope of supply: manual operating handle, keys, spare parts kit, nameplate & manual (per lot), mounting accessories.

We offer documentation for manufacturing the PD-14 motor-operated drive:

– Preliminary technical documentation for tenders related to PD-14 production. We will prepare the information required to assess feasibility against tender requirements and data sheets.
– Working drawings, 3-D models and other documentation needed to manufacture the PD-14 at your facility. If you do not plan to produce parts in-house, we will help outsource their manufacture. Final assembly and wiring will be done at your site.
– All documentation can be adapted to project requirements and to the technological capabilities of your facility.
– If the substation has equipment from another manufacturer, we will prepare documentation for producing compatible equipment to supplement the installed base.

Benefits of working with us

– No need to maintain highly qualified design staff - you receive a complete documentation package; an engineer of average seniority can work with it.
– No pilot production required - our experience allows launching serial batches successfully.
– Working to our documentation, your specialists will receive consulting on all issues related to manufacturing the PD-14 motor-operated drive.

Standards compliance

Design and manufacturing account for applicable requirements for disconnectors, earthing switches and their operating mechanisms, as well as enclosure ingress protection and environmental classes. Key normative documents include:

• IEC 62271-102:2018 (+AMD1:2022) “High-voltage switchgear and controlgear - Part 102: Alternating current disconnectors and earthing switches”.
• IEC 62271-1:2017 (+AMD1:2021) “High-voltage switchgear and controlgear - Part 1: Common specifications”.
• EN/IEC 60529 “Degrees of protection provided by enclosures (IP Code)”.
• EN/IEC 60721-3-3 (stationary use at weatherprotected locations - typical for indoor installation) and EN/IEC 60721-3-4 (stationary use at non-weatherprotected locations - typical for outdoor installation).
• GOST references from the original specification (GOST 689-90, GOST 15543) can be maintained for legacy projects upon request.

Engaging contractors and partners

We welcome cooperation with disconnector manufacturers, assembly shops, metalworking plants and engineering firms. Possible collaboration models:

• Contract manufacturing - production to our design package at the partner’s facilities with process audits.
• Co-manufacturing - fabrication of individual units (gear unit, cabinet, kinematics, harnesses) with final assembly at the partner.
• Investment participation - financing serial launch with access to energy markets and logistics.
• Integration with switchgear lines - tailoring linkages and rods to specific disconnector types and portal structures, supply of “disconnector + drive” kits.

Documentation offered

The PD-14 manufacturing package includes: working drawings (DWG/DXF), 3D models (STEP/Parasolid), BOMs and part lists, routing cards, assembly and adjustment instructions, schematic diagrams (single-line, wiring, SCADA I/O), external connections and SCADA integration, requirements for BU, as well as the operation manual. On request we provide a package for import substitution and integration with standard protection & control panels. Documentation can be adapted to your CAD systems (AutoCAD, SolidWorks, etc.).

For additional information on the PD-14 drive please contact: inbox@proekt-energo.com

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