Rappel Group Product Range

Low Voltage Switchgear

Low Voltage switchgear
  • Constructed to form four type two, five, six or seven.
  • Current carrying capacity of up to 5000 Ampere.
  • Fault ratings of 25kA, 50 kA or 80kA.
  • Front and rear access construction to suit any switchroom.
  • Close coupled cast resin transformers and MV Switchgear.
  • Supporting steel frame work constructed from fully welded 2mm, zinc coated, folded steel.
  • Internal gear trays manufactured from 1.6mm galvanised steel.
  • All steelwork is treated before a polyester powder coating is applied.
  • Manufactured to: BS EN 60947-1 - 1994, BS EN 60439-1 - 1992 & CE marked.
  • Bus bar systems are ASTA certified to specific fault rating.
Package Sub Stations

Package Sub Stations

Complete custom built M.V / L.V package substation assemblies can be offered as part of our product range; cast resin transformers up to 4MVA, incorporating medium voltage switching units, close coupled to the transformer housing or stand alone units.

  • Cast resin transformers naturally cooled up to a rating of 4MVA.
  • Forced cooling of transformers also available to increase output by 40%
  • Close coupled ring main units, M.V switches or H.V cable termination boxes.
  • Low voltage connections are directly connected from the secondary of the transformer to the main low voltage air circuit breaker, removing the need for on site cabling.
  • Safety interlocking with M.V switching device and transformer enclosure, preventing access until the M.V supply is isolated.
  • All forms of separation are available on the main switchboard.
  • Safety over-temperature protection systems are standard, monitoring the transformer windings.
  • Front or rear access is available, with both top and bottom entry / exit cabling options.
  • Ingress protection of IP31 with several options available for up to IP54
  • A comprehensive range of main and sub metering options are available, with remote communications.
  • All types of functional units are available including ACB’S, MCCB’S, fused switches and integral MCB boards.
  • Battery backed inter-tripping circuits for interfacing with the medium voltage supply and restricted earth fault protection is available.
Package Sub Stations

Distribution Pillars

Typically for car park lighting, CCTV and security systems these feeder pillars are constructed from high quality, zinc coated, fully welded sheet steel with semi concealed hinges and tamper proof locks.

They also include a sloping canopy and chipboard switchgear tray. All are pre-treated prior to painting and finished in polyester powder to: BS381C631 Grey as standard.

Option extras include:

  • 2mm stainless steel
  • Glass reinforced, plastic key locks.
  • Padlock Hasp.
  • Marine ply / sheet switchgear tray.
  • Hot dipped galvanised.
  • Roots for mounting into soft ground.
  • Pre-fitted with switchgear if required.
  • Colour of your choice.

Power Factor Correction

Power factor is the ratio of "useful" power compared to "total" power consumed by an electrical plant. Equipment requiring a creation of a magnetic field to operate, such as: motors and motor driven machines, induction heaters & fluorescent lighting will all draw a current which is said to lag behind the voltage, therefore producing a "lagging" power factor.

An untreated supply with a power factor of 0.8 on a 1MVA transformer, means the consumer can only draw 800KVA, as the lagging currents produced have no power. Electricity companies charge for the wasted power as "reactive power charges" as indicated on electricity bills.

Rappell can supply and install power factor correction to correct this inefficiency, as a stand alone unit or integral to the main switchgear. Which will increase the supply capacity and reduce electricity bills for the end user!

Power Factor Correction

Forms of Separation

Rappell follow stringently the standards which apply to our products, which are currently undergoing transition from BSEN 60439-1 to BSEN 61439-1, and BSEN61349-2. We have the ability to offer a solution to either standard during the transition period.

We construct all our switchgear in line with the Bema forms of separation guides, a copy of which is available to download below:

Forms of Separtion:

BSEN60439-1 describes the classification of the forms of separation, the main criteria being:

  • Protection against accidental contact with live parts belonging to the adjacent functional unit.
  • Prevention of foreign solid bodies passing from one functional unit compartment to another.
  • Limiting the probability of an internal arcing fault.

Achieving forms of separation:

Rappell offer as standard form four type two, five, six and seven construction as a fully compartmentalised construction, ensuring each functional unit is housed in an individual compartment with separation via metallic barriers. The functional unit has a door interlocked rotary handle preventing access to the device until isolated.

A variation on the form four type two and six construction is a group mounted assembly, where functional units are mounted in a common compartment separation from main bus bars is achieved by metallic barriers and separation between functional units utilises the device casing. The compartment has a common door for access, with a common cableway for outgoing connections.

All forms are available as front or rear access for external cabling connections. Many manufacturers of switchgear have interpretations on the forms of construction, at Rappell we are happy to advise on which form will suit your application and offer value engineering options where accepted.

For more information please contact your local sales engineer or our internal sales team.