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Additional info for ANSI-IEEE 1010-1987 Guide for Control of Hydroelectric Power Plants
Others require a protective relay trip plus temp alarm before deluge system operates. Transformers (1) Temperature (2) Protective relay trip (1) Water deluge systemÑProtective relay trip should initiate only if water supply is unlimited and oil spill clean-up is considered. Hydraulic, lubricating oil, other mechanical areas (1) Temperature (2) Smoke (1) Water deluge systemÑBearing overtemperature protection (covered elsewhere for generators) helps prevent ignition of lubricating oil. (2) CO2 or Halon 1301 system.
Dynamic braking of the machine can be accomplished by reconnecting the static starter after the unit has been tripped off the system. Circuitry inside the starter changes the direction of power ßow to allow motor braking. This feature can result in greater life of the unitÕs mechanical brakes. Static starting can be used on a variety of sizes of machines. Typical starting time is less than ten minutes. The interfaces from the static starter to the unit control switchboard are listed in Table 3K-2.
Cooling water is circulated through hollow conductors rather than heat exchangers imbedded in the winding. Water quality is of utmost importance in this type of cooling. 44 Copyright © 1988 IEEE All Rights Reserved HYDROELECTRIC POWER PLANTS IEEE Std 1010-1987 Table 3N-1 ÑControl and Status Data Transmitted to and from the Cooling System and Unit Control System DESCRIPTION TYPE NOTES Fan failure A, P Trip occurs on multiple fan failures resulting in insufficient air flow. Raw water low flow A Trip is accomplished by winding temperature.