FBX RING MAIN UNIT

FBX

The Ring Main unit for your distribution requirements

FBX is a medium voltage switchboard up to 24 kV, 630A, 21 kA for 3s, used in secondary distribution applications. It can be fitted with the following protection devices

  • Transformer protection by vacuum circuit-breaker (T2 function)
  • Line protection with 630A circuit breakers
  • Network switching by switch-disconnector

Its compactness, wide range of functions and ease of installation and extensibility, make it a versatile switchboard to fit many secondary distribution applications such as: public distribution, industry, infrastructure or renewables

Schneider Electric Ring main Unit

FBX at a Glance

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  • Ratings upto 24kV , 630 A
  • 20kA for 3 sec STC for 22kV and 21 kA for 3 sec for 11kV
  • 50 nos Shortcircuit operations , longer life
  • Compact and extensible type
  • Stainless steel tanks & cable boxes are fully internal arc tested for 21kA for 1 sec ( AFLR category)
  • Voltage indicators (VPIS) are located on front panel
  • Interlocks in line with IEC 62271-200
  • Clear and user friendly mimic
  • Easy extension through “F link “ without any gas handling at site

3 Way Das RMU

Technical data in line with IEC 62271-200

FBX Value propositions

Reliablility

  • An uncomparable field-proven experience with more than 5,00,000 functions installed worldwide
  • Clear switchgear status indication in line with IEC 62271-102(closed, open, earthed).
  • An emergency back-up handle for motorized mechanism
  • Manual opening and closing mechanism driven by a fast-acting /snap action mechanism, independent of operator action
  • Padlocking facility to limit access to the operating mechanism of each components (LBS,CB,Earthing switch)

Efficiency​

  • A simple and limited maintenance and long service life
  • The extension on the left or right hand side of your FBX with one or more functional units can be carried out by simply adding modules that are connected to each other at busbar level by directed field bushings. Operation can be carried out on site:
  • Without handling any gas
  • Without any special tooling

Safety

With FBX ,we are committed to safety of operator.

  • FBX internal arc(in conformity with IEC 62271-200 appendix A)
  • Internal arc tested for both cable and SF6 tank , enhanced safety.
  • Sealed Pressure system with Gas Tight (IP67) stainless steel enclosure containing the live parts of switchgears and busbars
  • Safety valves at the rear yield and thus avoid gas overpressure
  • Voltage indicators (VPIS) are located on front panel of the equipment
  • The presence of interlocks, as recommended in IEC 62271-200 through simple & easy understandable mimic, contributes to safe operation of switchgear

Product Architecture

Top canopy for outdoor protection – IP55

Secondary compartment for housing-

  • Live line indicator.
  • Fault passage indicator.
  • SF6 Manometer.

Operating mechanism and mimic diagram

Relay Compartment.

Cable Compartment (front access).

External earthing point.

Vacuum Circuit Breaker

Hermetically sealed tank

Cable plug-in connections

Tank pressure Manometer

Identification plate

The rating plate supplies information on the version, the short time rated current, rated voltage and functions.

Range of functions

FBX-C: compact version

  • This version can be easily integrated into a substation thanks to its compact size and small footprint. Up to 5 functional units can be assembled in a single tank insulated by SF6 gas.

FBX-E: extensible version

  • FBX-DE: Double Extensible version
  • FBX switchboard can be extended on either or both left and right sides.
  • FBX-SE: Single Extensible version
  • FBX switchboard can only be extended on the right side.

General characteristics

Extensibility

  • FBX-E offers extensible configurations for secondary distribution applications.
  • The connection of each functional unit allows for multiple combinations depending on the installation requirements.
  • FBX-E permits the connection of additional units on the left or right-hand side, thereby offering greater flexibility in the choice and positioning of the medium voltage switchboard functions.
  • The installation and in-line connection of FBX-E does not require any handling

Erection and assembly

  • The extension is a very simple process thanks to:
  • The F-link device used to connect the busbars of two cubicles.
  • Variations in positioning are compensated by fixed, spherical contacts and mobile couplings that can be adjusted axially and radially.
  • Highly secure dielectric seals made with silicone insulating conical connectors adapted to the electrical voltage.
  • The assembly of the insulating connectors is maintained by a mechanical force generated by:
  • Integrated guiding pins for the correct alignment of the cubicles
  • An assembly by bolts secured by mechanical stops.
  • During the assembly of an extension cubicle, an additional space of at least 450 mm is necessary to allow for handling.

Efficient

Project Assistance

Sales & Service Support

Long-term Planning

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Medium Voltage Power Distribution Solutions.