About us
Christopher Langridge studied Theoretical and Experimental Physics at Trinity College Cambridge, whilst also rowing for 4 winning Cambridge Crews, before developing, with his father and brother, a start-up venture manufacturing the molybdenum substrates supporting silicon wafers in power semiconductors, and seeing, first-hand, the emergent technologies for efficient power-control switching devices.
Following the sale of Molypress in 1988 he established Riker, to develop high-capacity precision current sources using IGBT-controlled High Frequency Power Conversion and also undertook the restoration of Stockton House in Wiltshire.
After experimental development of several systems with up to 1kA output, Riker’s first major project was a 10kA portable precision injector for testing Circuit Breakers protecting Traction-Supply Circuit Breakers on London Underground. This led to a further system, stable to 5ppm, for calibrating National Grid Shunts for GEC-Alstom‘s Electrical Testing Laboratory and a UK Government National Measurement Award, presented by the National Physical Laboratory. Riker has since been heavily involved in testing and calibrating Traction Supply Circuit Breakers for most major UK DC railways, metros and tram systems plus further critical applications in nuclear power and industrial motor-drives. Its sister company, LML Products, manufactures and develops conduction and connection solutions for critical applications in all areas of high-current power distribution and interconnection.
Proper exercise, testing, calibration and diagnostic analysis are critical aspects of ensuring the health and reliability of DC protection systems.
Clients include:
- London Underground
- British Transport
- Transport for Greater Manchester (TFGM)
- West Midlands Metro
- United Kingdom Atomic Energy Authority (UKAEA)
- National Grid
- Brush Group
Riker takes pride in detailed thermal and electrical performance analyses and modelling which provide valuable insights for new designs and existing applications alike.
