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Safety Alert Reyrolle LM, 11 kV Switchgear Circulation. Mine Owners. Mine Managers. Coal Mine Unions.
Inspectors Safety Circular Dear Sir Mine Managers should note the enclosed information relating to the use of Reyrolle LM, 11 kV switchgear. The problem outlined can lead to the circuit breaker failing to correctly remove power when a fault occurs and this can be a danger to anyone in the vicinity of the switchgear.
If you have this type of switchgear in use at a mine then the manufacturers, or persons competent to carry out the necessary modifications, should be contacted without undue delay. Yours faithfully S P Wing HM Principal District Inspector of Mines LM23T, LM36T and LMI Switchgear Information, recommendations and instructions Summary This document relates to EA SOP 206 raised on type LM23T, LM36T and LMI Switchgear circuit breakers and the long term maintenance of dashpot washers.
This information does not apply to type lmt2 switchgear Background Dashpot Buffer Washer SOP 206 was raised following an internal fault on a LM23T circuit breaker manufactured in 1974. Investigation has revealed this was probably due to the opening spring dashpot piston seizing within the cylinder resulting in incomplete travel of the main contacts. The dashpot contains a PVC buffer washer which is immersed in oil and over a long period of time, the pasticizer in the PVC can migrate into the oil, in some cases causing shrinkage and hardening of the washer. Subsequently the washer could become loose and displaced and due to the impact of the piston it could disintegrate. LM23T/LM36T/LMI Circuit breakers were manufactured between 1960 and 1976 and can be easily identified from the data label by the article number.
861A - and/or a constructional number X2 to X22. LMT2 Circuit breakers NOT AFFECTED were manufactured between 1973 and 1997 and can be identified from the data label by an article number 971A - and/or a constructional number X30, X31, X32 or X33. Recommendations / Inspection / Actions Although the incident rate is low (second recorded incident) the consequences could be severe therefore all buffer washers over 12 years old should be replaced. This affects LM23T, LM36T and LMI Switchgear, all use the same type buffer washer. A replacement buffer washer is now available of superior material which will have a life of at least 20 years. For further information please contact: Reyrolle Switchgear Tel.
Reyrolle and Co of Hebburn-on-Tyne; manufacturer of switchgear and appliances for control of electricity supply. 1886 moved to London from France and set up an electrical engineering company. 1901 he moved to Hebburn and founded A. Reyrolle and Company as a public company. The company still occupies the same site today, over 100 years later. Also played a large part in founding the company; his son Norbert was a director for 27 years and chairman for 6 years. 1906 Reyrolle was joined by the world famous.
Nov 27, 2012 - If you have this type of switchgear in use at a mine then the manufacturers, or persons competent to carry out the necessary modifications, should be contacted without undue. Information, recommendations and instructions. RPS Switchgear is the world's premier manufacturer and supplier of medium. With very little or no disruption of supply while the work is being carried out.
Using Reyrolle's sound engineering background and Clothier's genius as a switchgear designer, the company started on the road which made its product a world leader in its field. 1906 Pioneer in metal-clad draw-out switchgear. 1911 Issued pamphlet on protected lever type motor starters for continuous current machines. 1911 Electrical Exhibition. High-tension switchgear and other equipment.
1912 formed as wholly-owned subsidiary 1928 incorporated as electrical and general engineers; wholly-owned subsidiary. Reyrolle and Co established Ltd as a private company for construction of electrical and other plant with the specific aim of acquiring shares in from the executors of the estate of the late Sir Charles Parsons. Two directors were appointed by Reyrolle and one. 1936 4000 employees. Subsidiaries included the (half share), which had seen increased in demand for its specialised manufactures, which business is merged with Reyrolle's, and 1937 Electrical engineers.
1937 With, and J. Savage, established, a private company, to carry on the business of manufacturers and operators of and dealers in searchlights and projection apparatus, sound locators and detectors, etc. 1947 Issue of shares to the public. At this time, Reyrolle's owned 40% of, 50% of, 50% of the the, 30% of and 10% of Ltd. Acquired interest in Ltd.
Had no assets or liabilities other than a loan to the parent company. 6500 employees. Late 1950s: Jointly and A. Reyrolle and Co had the largest shareholding in the Ltd, the first nuclear consortium to be formed in the U.K. In 1959 they recognised that the number of orders for nuclear power plants would be constrained because each one had such large generating capacity.
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For this reason, they decided to make a move towards rationalisation by joining with the - consortium, forming the. Although this caused some loss of work for the constituent companies it meant that, by 1968, the Group was constructing 6 out of 12 nuclear plant ordered in the U.K., and one of two such plant sold abroad.
Variable speed motors. Reyrolle and Co, Ltd parent of six subsidiaries. Based at Hebburn-on-Tyne with branches at Ashington and Newburn-on-Tyne. Employ 8,000 persons. Claim to be the largest manufacturer of switchgear in the world.
1968 Description of their extended works at Hebburn. Reyrolle and Co merged with, forming. Would be a holding company - the and Reyrolle subsidiaries would continue to trade under their own names as these are well known in the industry. Reyrolle purchased 37% of Parsons' shares from which, with its existing holding, gave it control, and then offered to buy the other 45% which were in public hands. Sources of Information. The Times, 4 June 1946.
The Times, 16 October 1947. of 18th August 1911 p187.
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of 13th October 1911 p387. The Times, 16 October 1947. The Times, 16 October 1947.
The Times, 22 January 1934. The Times, 6 April 1936. The Times 24 November 1937.
The Times, 16 October 1947. The Times, 27 May 1968. The Times, 27 May 1968. Mechanical World Year Book 1960. Published by Emmott and Co of Manchester. Advert p175. of 2nd February 1968 p201.
The Times, 27 May 1968. The Times, 21 March 1968. www.vatech-td.com.