Showing papers on "Diesel generator published in 1985"
01 Jan 1985
TL;DR: A traditional cost/benefit analysis based on production costs and investment risks is not yet favourable due to the high initial cost of solar systems, but if other criteria such as security of supply, balance of payments, etc ... are taken into account, solar energy can possibly be an interesting proposition.
Abstract: In order to further rural development in the Third World, dispersed electrical power systems can be advantageously used. Small communities far removed from the grid expect to be able to produce electricity in the most reliable and self sufficient way with their own limited qualified manpower and primary ressources. Solar technologies systems may therefore be considered whenever high insolation is available, instead of using Diesel engines and expensive fuel. Moreover, the modularity and long lifetime of such systems are very desirable features. A traditional cost/benefit analysis based on production costs and investment risks is not yet favourable due to the high initial cost of solar systems. Nevertheless, if other criteria such as security of supply, balance of payments, etc ... are taken into account, solar energy can possibly be an interesting proposition.
23 citations
Patent•
23 Feb 1985
TL;DR: In this paper, the rotating speed of an engine at the loaded motor starting time was suppressed by controlling the field voltage so that the ratio of a ganerator voltage to the engine speed becomes equal when the engine speeds decreased to the set value or lower due to loading.
Abstract: PURPOSE:To suppress the decrease in the rotating speed of an engine at the loaded motor starting time by controlling the field voltage so that the ratio of a ganerator voltage to the engine speed becomes equal when the engine speed decreases to the set value or lower due to loading. CONSTITUTION:When a Diesel generator facility start signal is outputted in emergency, a Diesel engine 1 is started, after starting is completed, the rotating speed is maintained at a rated rotating speed by a governor, and the voltage of the generator 2 is controlled to become equal to the rated voltage by an automatic voltage controller 6. When a breaker 13 is closed and an induction motor 14 is started, if the engine speed becomes the prescribed set value or lower for the rated rotating speed, a relay contact 10a is closed to transmit the detection signal of the engine rotating speed to the controller 6. When the controller 6 receives the rotating speed detection signal, the field voltage is controlled so that the ratio of the generator voltage to the engine speed becomes equal.
3 citations
01 Jan 1985
TL;DR: In this paper, a regression analysis of the estimates of the probability of failure to start based on surveillance test data from 1976 through 1983 indicates that the probability has been decreasing and that diesel generator performance during losses of off-site power for 1981 through 1983 was less than expected based on the test data estimates.
Abstract: Success and failure data of test and emergency starts of emergency ac power sources (diesel generators) at US nuclear power plants were collected and evaluated to estimate diesel generator reliability parameters A regression analysis of the estimates of the probability of failure to start based on surveillance test data from 1976 through 1983 indicates that the probability of failure to start has been decreasing However, the reliability of diesel generator performance during losses of off-site power for 1981 through 1983 was less than expected based on the test data estimates The failures that occurred during losses of off-site power were reviewed to determine why the calculated failure to start was greater than expected, and possible explanations for this high value are presented The subsystems involved in diesel generator subsystem failures were categorized to determine whether there were any dominant failure modes The results indicate that further significant improvement in diesel generator reliability will require improvement of many subsystems
3 citations
Patent•
24 May 1985
TL;DR: In this article, the phase relation between a generator and an engine was determined on the basis of a key groove, and a generator was coupled to an engine so that a phase relation may be 180 degrees different from the phase relations in the side of the generator.
Abstract: PURPOSE:To shift a phase of waves of generated noise so as to reduce the noises from both engines, by dividing plural sets of generator devices into every two sets and arranging the phase relation, coupling a generator to the engine, in one set to be shifted from that in the other set. CONSTITUTION:In one of the two sets of engine driven generator devices, the mutual relation between a shaft 3 of a generator 1 and a cylinder 6 of a Diesel engine 5 is determined on the basis of a key groove. Then in the other set of the engine driven generator devices, a generator is coupled to an engine so that a phase relation may be 180 deg. different from the phase relation in the side of the generator 1. That is, a noise of exhaust from the engines 5 and 5' is emitted to the outside through a silencer 9 by coupling the generators in a position such that a cylinder 6' is 180 deg. shifted from the key groove of a shaft 3'. In this way, the noise is silenced by 180 deg. shifting the respective position of a waveform of noise from the engines 5, 5' and compounding positive and negative parts of the waveform of noise from the both engines so as to virtually cancel the both waveforms of noise.
1 citations
TL;DR: This paper is intended to be neither a comprehensive checklist of test data to be recorded and analyzed nor a reference book of problems associated with certain data trends, rather, it is presented to illustrate examples of useful information obtained through test data review.
Abstract: Historically, diesel generator qualification and periodic testing has been primarily concerned with demonstrating equipment operability and providing a data base for which numerical values for reliability are calculated. Although these factors are required for plant licensing and operation, a properly planned and implemented testing program can provide useful information regarding maintenance and testing procedures and intervals, component deterioration, setpoint drift, or impending failures. To provide meaningful results in these areas, a testing program must rely on accurate data acquisition as well as a thorough review by qualified personnel to point out discernable trends and determine their significance. This paper is intended to be neither a comprehensive checklist of test data to be recorded and analyzed nor a reference book of problems associated with certain data trends. Rather, it is presented to illustrate examples of useful information obtained through test data review.
1 citations
TL;DR: In this paper, a combined analytical and testing-approach is applied to major diesel engine components such as crankshafts, connecting rod bearing shells, and pistons to predict future performance of critical components, and define areas of focus for NDE or monitoring.
Abstract: The reliability of emergency diesel generators is of prime concern to the nuclear power industry Assurance that these components will perform their intended functions has usually been approached by requiring frequent, and occasionally abusive, testing The testing procedure is suspected to result in some life reduction to the equipment A current program addresses the evaluation of structural integrity of diesel generator components through a combination of engine pre- and postoperational testing, design analysis, nondestructive examination, and monitoring to maximize reliability with minimum wear of the engine This program employs engineering analysis to understand previous problems, to predict future performance of critical components, and to define areas of focus for NDE or monitoring The analysis also provides conservative in-service inspection intervals and a quantitative basis to extend or eliminate NDE requirements Engine testing and inspection provide verification of this analysis and at the same time refine the accuracy of the predictions This paper describes applying this combined analytical and testing-approach to major diesel engine components such as crankshafts, connecting rod bearing shells, and pistons
1 citations
Patent•
11 Oct 1985
TL;DR: In this paper, the combustion air for an emergency diesel engine is heated during non-operation and the heating is stopped when the starting of the engine is finished perfectly, and when a predetermined time has elapsed after starting the engine, the operation of the heating device 6 may be stopped automatically.
Abstract: PURPOSE:To permit to start rapidly by a method wherein the combustion air for the emergency diesel engine is being heated during the time of non-operation and the heating is stopped when the starting of the engine is finished perfectly. CONSTITUTION:An emergency diesel engine 2, for supplying cooling water or the like upon occurring trouble in a nuclear power plant, is installed in a basement 8 or the like. Combustion air is sucked from a suction pipe 1, opening in the chamber 5 of an upper floor having a louver 7 and is discharged out of an exhaust pipe 3. When the engine is not being operated, a heating device 6 in the chamber 5 is operated so as to be ready for emergency and air in the chamber 5 is being heated. When the diesel engine is started upon emergency, it can be started immediately since the preheated combustion air is sucked. When a predetermined time has elapsed after starting the engine, the operation of the heating device 6 may be stopped automatically.
1 citations
Proceedings Article•
01 Oct 1985
TL;DR: In this paper, a review of the power systems needed now and in the future for British Telecom's telephone exchanges, radio, and repeater stations has been carried out, which outlines the areas of investigation and shows how enhanced plant reliability targets are being achieved and maintenance problems reduced.
Abstract: British Telecom has installed some 4,500 Standby Diesel Generator Sets in its telephone exchanges, radio, and repeater stations over the past 25 years. Given the changing pattern of equipment technology from analogue to digital systems, particularly in major centres, and the increasing penetration of AC operated computer based plant, a review has been completed of the power systems needed now and in the future. A study has also been undertaken of AC power and total system reliability. This paper outlines the areas of investigation and shows how enhanced plant reliability targets are being achieved, and maintenance problems reduced.