Diesel generators electrical protection

The bank needed to maximize the availability of its computer system to protect existing clients while attracting new ones. A traditional system, combining an uninterruptible power supply (ups) with power from the electric grid and backup diesel generators, would have more than a 63 percent probability of a major failure over its 20-year life. The SurePower system has less than a 1 percent chance of a major failure in 20 years. This may well be the difference between business success or bankruptcy. 

To ensure effective cathodic protection (CP) of gas pipelines in the remote arctic regions of Russia shown in Fig.l, where it would be uneconomic to run power lines and where conventional techniques such as small gas or diesel generators, wind and solar power plants fail, it is possible to use thermoelectric converters of heat into electricity and based on them standalone thermoelectric generators (TEG). 

ELECTRIC POWER SYSTEM Clas I,II and III Electnc System CSAB290 5 The Class III system pow ers designated safety -related and economic equipm i protection loads pump motors, valv es etc) Normally Class IV power supplies the Class III power W. cn the Class IV system fails two redundant standby diesel generators provide Class ni power The ac Class II and dc Class I systems supply un-mtermptible power to the control and safety svstems... 

Compared with present-day LWR plants, the electric power supply systems of PIUS have been simplified significantly. The main reason for that is obviously the "inherent" self-protective functions of PIUS that eliminate many traditional safety-grade systems or reduce their importance to such extent that they can be declassified. Thus, a "two trmn" electrical supply system structure has been found fully acceptable with respect to safety and plant availability concerns. In order to improve the reliability of the power supply for important process functions, e.g. for protection of the capital investment, low voltage diesel generators are provided in the PIUS plant, but they are not safety-grade. The elimination of most of the DC distributions represents another major simplification of the electrical power supply system. 

The diesel generator fuel oil transfer system consists of two independent fuel storage, transfer and recirculation flow paths that is, one path per diesel generator. Each path consists of a fuel oil storage tank, one fuel transfer pump, diesel fuel oil supply and fuel return piping, a day tank, and the associated specialties valves, fittings, and instrumentation. The supply lines from the transfer pumps to the day tanks include fuel oil heaters, filters and moisture separators. The system is protected from the effects of low temperatures by the inline electric oil heater in the transfer line. 

Requirements for the availability of the electrical power sources should be stated for all operational states. These include off-site sources on-site generators (diesels and gas turbines, including associated fuel reserves) batteries and associated control protective, distribution and switching devices. The operability requirements should be such that sufficient power will be available to supply all safety related equipment necessary for safe shutdown of the plant, and for the mitigation and control of accident conditions. The operabihty requirements should determine the necessary power, redundancy of supply lines, maximum permissible time delays and necessary duration of the emergency power supply. Equivalent requirements should be stated for other power sources (for example, the pneumatic power system). Particular care should be taken to ensure that electrical supplies remain adequate in shutdown operations, when many systems and components will be out of service for maintenance. 

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