The RVFZ-10 (RVF-10) indoor AC disconnectors are used to isolate, without load, individual sections of 6 or 10 kV three-phase networks and to earth de-energized sections by means of built-in fixed earthing blades. Unlike RVZ units, RVFZ uses through-wall (bushing) insulators instead of post insulators, which makes it convenient to bring the conductor in from one side of a partition and take it out from the other without additional wall bushings.
Typical applications:
- Package transformer substations (KTP);
- Single-front metal-clad cubicles (KSO);
- Metal-clad MV switchgear (KRU);
- Outdoor complete switchgear KRUN;
- Mobile package transformer substations;
- Main distribution boards (MDB);
- Capacitor banks;
- Incoming and distribution panels.
Product range:
- RVFZ-10/400 - disconnector rated at 400 A;
- RVFZ-10/630 - disconnector rated at 630 A;
- RVFZ-10/1000 - disconnector rated at 1000 A;
- RVFZ-10/2000 - disconnector rated at 2000 A.
The disconnector is supplied as a three-pole unit with earthing switches (RVFZ-10) or without earthing switches (RVF-10). Mechanical interlocking prevents hazardous mis-operation:
- blocks the earthing switch from closing when the main blades are closed;
- blocks the main blades from closing when the earthing switch is closed.
Rotation of the operating shafts of the main circuit and the earthing switch is manual, via PR series hand-operated mechanisms. RVFZ disconnectors are available up to 2000 A.

Technical data

Purpose and application

RVFZ-10 (RVF-10) is intended for fast sectionalizing and reconfiguration of 6–10 kV MV distribution schemes, for providing a visible isolating gap during operational switching, for fault localization and for establishing a safe work zone. By using through-wall bushings, current-carrying parts can be arranged on opposite sides of a cabinet/cubicle partition, which simplifies KRU/KSO layouts and reduces the number of transition joints. The disconnectors are used in busbar sections, incomers/feeders, connections to transformers, reactors, capacitor banks, as well as in standby supplies and bus-tie/bypass sections. In sectionalizing cubicles the device enables quick network reconfiguration (source transfer, bus-tie/bus-reserve) without tripping adjacent feeders.

Compared with classic RVZ (post-insulated) designs, the RVFZ shaped arrangement offers more flexible layouts, reduces module dimensions, simplifies bus/cable routing and lowers the number of potential hot-spots by cutting intermediate bolted joints.

Service conditions

Baseline environmental classification - EN/IEC 60721-3-3 (indoor, weather-protected). Other classes on request. Rated frequency - 50 Hz; installation altitude - up to 1000 m above sea level without insulation derating (apply altitude correction above 1000 m according to general requirements for medium-voltage switching devices). Degree of protection for the device without an enclosure - IP00 (in a cubicle, the protection degree is that of the KRU/KSO enclosure). Acceptable ambient conditions - industrial sites free from aggressive gases and conductive dust beyond normal levels, and vibration not exceeding the limits specified in the product data. Operation is indoors with temperature and humidity maintained per the project and the switchgear operating documentation.

The disconnector is designed for standard mechanical impact categories applicable to MV switchgear. Clearances and creepage distances are sized for the 6(10) kV class; for locations with elevated pollution, humidity or at altitudes >1000 m, increased creepage/extra insulation measures are recommended. The permissible temperature range and other climatic factors are specified to EN/IEC 60721-3-3; extended options are available on request.

Design and layout

RVFZ-10 is a three-pole vertical-break disconnector on a welded base frame. Each pole includes: through-wall bushing insulators (on the hinge or jaw side, depending on the version), a moving blade, a contact system (fixed and moving contacts with high specific pressure), current bars and mounting hardware. Through-wall bushings allow current entry/exit across cubicle partitions, which is convenient for separating the busbar and cable compartments. Contact surfaces typically feature hardening and/or silver plating to reduce contact resistance and improve cyclic endurance. Additional pressure elements and springs maintain contact force throughout service life.

Earthing blades (for RVFZ versions) can be fitted on the hinge side or on the jaw (fixed contact) side to match the cubicle layout. Positions are positively defined with visual indication (“ON/OFF”). The three poles are mechanically synchronized. Drive torque is transmitted via operating shafts with a linkage mechanism. The design provides connection pads for bars/flexible links and holes for bolted joints (sizes agreed at order). Overall dimensions and inter-pole spacing are selected to suit the current rating and the space constraints of the cubicle, simplifying integration into various KRU sizes.

Manual operator - PR series (type PR-10 or equivalent), with door- or side-mounting. Options include interlock hardware on the operator (position latching, padlocking points) and auxiliary position switches for SCADA indications. On request, a motor operator can be supplied for remote control.

RVZ vs. RVFZ layouts (to aid selection)

Safety and interlocking

The device provides a visible isolating gap and employs mechanical interlocks to prevent hazardous operations. The operator interlock prevents closing the earthing blades when the main circuit is closed, and blocks closing the main blades when the earthing switch is closed. Padlocking points are provided in the open position, as well as mounting for auxiliary limit switches to indicate “ON/OFF/EARTHED”. Integration into the cubicle key-interlock system (cable/key schemes) is supported. Protective screens and barriers around the contact area prevent accidental contact with live parts during maintenance.

Versions and options

RVFZ-10 is supplied in several current ratings (400; 630; 1000; 2000 A) according to continuous load and cooling conditions. The earthing-blade arrangement is selected by side (hinge side or jaw side); dual earthing (both sides) can be provided for special layouts. By agreement, variants with modified inter-pole spacing, shaft orientation, operator position, sets of auxiliary contacts and signaling switches are available. On request, mounting kits for different bar/cable types and transition bars can be supplied.

Standards compliance

The design and testing of the disconnectors comply with applicable MV switchgear standards. Depending on the destination market and project requirements, the following standards (latest editions) are applied:

• EN/IEC 62271-102: AC disconnectors and earthing switches (including Amd 1);
• EN/IEC 62271-1: High-voltage switchgear and controlgear - Common specifications;
• EN/IEC 60721-3-3 and EN/IEC 60721-3-4: Environmental conditions (classification for weather-protected and non-weather-protected locations);
• DSTU EN IEC 62271-102: National adoption for Ukraine (for deliveries to the Ukrainian market).

Manufacturing cooperation

For large batches we arrange cooperation with specialized manufacturers and contractors to perform machining, bar work, subassembly, painting and quality control. This shortens time-to-series, reduces development costs and enables fast adaptation to the project requirements and the customer’s manufacturing capabilities. Subassemblies and connection kits can be supplied for integration into third-party KRU/KSO platforms.

Project and manufacturing documentation package

For each project we provide a documentation set for design, process and production preparation: overall and connection drawings, assembly drawings, bills of materials, purchase lists, 3D models (Parasolid, STEP), and CNC exchange files (DXF, DWG). On request - adaptation to the customer’s CAD (AutoCAD, SolidWorks), operating documentation, test programs and procedures, product data sheets and certificates. Documentation can be aligned with the standards and quality practices used in the project.

We offer documentation for manufacturing RVFZ-10 disconnectors:

- Preliminary technical documentation for tender participation. We will prepare the information required to assess manufacturability against tender requirements and questionnaires.
- Working drawings, 3D models and other documents required to manufacture RVFZ disconnectors at your facility. If you do not plan to make parts in-house, we will help outsource them. Final assembly and fitting can be done at your site.
- All documentation can be adjusted to the project requirements and to your plant’s process capabilities.
- If other manufacturers’ equipment is installed at the substation, we will prepare documentation to produce matching equipment to complement it.

Benefits of working with us:

- No need to maintain a large team of senior engineers - you receive a complete manufacturing package that can be handled by a mid-level engineer.
- No need to build pilot prototypes - our experience allows launching series production directly.
- Your staff will receive guidance on all nuances of RVFZ-10 manufacturing when working to our documentation.

For additional information on RVFZ disconnectors please contact: inbox@proekt-energo.com

…and, as is commonly known, an error made at the design stage costs 10 times more in manufacturing and 100 times more in operation.

PDF - Download technical information on RVFZ-10 disconnectors