Download Rail Products Overview - Blakley Electrics

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Southern Service Centre 1 Thomas Road Optima Park Crayford Kent DA1 4GA Tel: 0845 074 0084 Fax: 0845 074 0085 Northern Service Centre Unit 55 Monckton Road Ind Estate Wakefield Yorkshire WF2 7AL Tel: 0845 074 0086 Fax: 0845 074 0087 Ware Engineering Centre Marsh Lane Ware Hertfordshire SG12 9QQ Tel: 0845 074 0082 Fax: 0845 074 0083 Enquiries can be submitted on line for all products by using the detailed enquiry form. Product questionaires are provided on line for many confi gurable products. Alternatively, submit your contact details via the Quick Enquiry form and we will contact you by return to discuss your requirements. Blakley Electrics have supplied the UK Rail Industry since the 1970s. Although there have been many structural changes during this period, with the two biggest End Users, Network Rail and London Underground, undergoing numerous changes, the fundamental requirements have remained the same, which is the need for high performance, reliable, robust electrical equipment, which can operate for long periods in a hostile, challenging environment. Trackside Transformers We have made a wide array of transformers for Trackside installation, including over 10,000 Points Heating Transformers for Overground installations and over 5,000 6 kVA Tunnel Power Transformers for installation throughout the London Underground tunnel network. We also have Network Rail approval for isolation transformers for signalling and other applications. Depots and Train Maintenance Maintaining rolling stock in good working order is a major undertaking and requires a range of specialist plant and equipment. We have supplied distribution equipment to some of the UK’s largest Maintenance and Repair Depots, providing supplies at 24V, 110V, 230V and 400V. RCD protection fi gures widely and the addition of Earth Continuity Monitoring protection can also be incorporated in areas of particularly high electrical hazard. Equipment for Station Installations Overground and Underground Stations have a wide range of electrical requirements. The multiple locations, the restricted working hours for maintenance, the need to provide a safe environment for large numbers of passengers and staff, coupled with different traction systems, has resulted in the development of a variety of specialist Distribution, Transformer and Protection assemblies, some of which are outlined in this publication. Detailed data sheets are available on our website for many of our “standard” Rail products. In addition, at our Ware Engineering Centre, we have a Projects Team who are keen to be involved in the early stages of either a new project or the development of a new product. The Projects Team have acquired a wealth of experience in the Rail fi eld and are keen to make a contribution. www.blakley.co.uk sales@blakley.co.uk
TRACKSIDE TRANSFORMERS Our range of trackside transformers has been developed over a long period. Today there is wide acceptance that trackside transformers must be capable of performing for a 15 to 25 year period and that the long term cost benefi ts of minimal maintenance and extended life far outweigh the apparent disadvantage of a higher initial cost. The use of high performance transformer cores with low inrush current can also have an overall cost benefi t, enabling transformers to be protected by “C” type MCBs instead of “D” type MCBs, which can allow supply cables with a smaller cross section to be utilised, due to the closer protection afforded by more sensitive MCBs. Isolation Transformers, 25 kVA and 50 kVA Tunnel Power Transformer, 6 kVA Points Heating Transformer, 10 kVA, DC Points Heating We have Network Rail approved Points Heating Transformers to supply heaters with AC or DC. We also have kits enabling AC output transformers to be converted to DC. All Points Heating Transformers have dual secondary windings, which is a requirement to ensure track circuit immunity. For longevity, enclosures are made from mild steel with a hot dip galvanized fi nish or they can be made from stainless steel, grade 316L; both types are petroleum jelly fi lled, to protect the windings and to assist with cooling. Tunnel Power Transformers Due to the short period available for maintenance on the London Underground tube system, the decision was made to install a 6 kVA three-phase transformer every 60 metres in all tunnels. Exacting demands were made re: the use of fi re safe materials; the physical size (a maximum depth of 165mm); and the electrical performance. We were able to meet all of these requirements and deliver to a very tight schedule. The transformers were installed in 1993/4 and still play a vital role in the maintenance of the tube system. Isolation Transformers We have Network Rail approval for a range of 1:1 ratio, isolating transformers rated from 1 kVA to 50 kVA, single and three phase. The transformers are installed when there is a need for isolation between DNO and signalling / traction earthing systems. We have also made step-down and step-up variants to the same general specifi cation. Step-up Step-down Pairs Long cable runs can be a feature of track installations. To overcome volts drop and minimise the size of cables, there are benefi ts in stepping-up the voltage at the start of a circuit and stepping-down at the far end. We can either step-up to 1000V, which is still classifi ed as Low Voltage and is compatible with the use of standard mains cable or we can step-up to 3300V, which requires the use of non-standard cable. Tappings can also be incorporated to help ensure equipment is supplied at the intended voltage. Fluctuating loads present specifi c problems, which need to be factored into the overall design, which we are pleased to discuss. Isolation Transformer with temperature sensor www.blakley.co.uk · sales@blakley.co.uk
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