Siemens 21-115532-001 manual Forced AIR Cooling Subbase Assembly

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SPECIAL FEATURES

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FORCED AIR COOLING

 

SUBBASE ASSEMBLY

 

 

 

Certain regulators may be equipped for forced-air cooling and include fans mounted on the radiators. The fans are usually automatically controlled by means of the change in oil temperature (see Connection Diagram). The thermometer located in the top transformer oil contains two identical switches which control fan operation when fan control switch is in “Auto” position.

The switches are normally set to start the fans at 65°C and to stop them at 55°C top oil temperature, but may be adjusted plus or minus 5°C.

A thermal overload relay is mounted on each fan motor. Any fan that develops trouble will be automatically disconnected from the line without affecting the other fans of the system. One fan can be removed from the radiators without affecting the operation of the others. When fans are out of service, care must be exercised to prevent overloading the regulator.

Subbase assemblies are available in 4-inch high increments from 21 through 49 inches for most JFR regulators. The proper height is selected by picking the elevation that will provide required clearance from foundation to the live part of the regulator bushing.

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Contents Instructions Page Table of Contents Page Qualified Person IntroductionIntroduction Physical Considerations Closed Delta Installation DiagramsControl Connections Protective MeasuresConnection Diagrams Inverted Design Ansi Type B Connection Diagrams Placing the Regulator in Service Removing the Regulator from Service General Instructions Operational Checks MaintenancePeriodic Inspection Special Features VARI-AMPTMRANGE and Current Ratings Available Operation AT Less than Rated VoltageForced AIR Cooling Subbase Assembly Major Components Parts List Parts ListType TLG Dial Switch Type TLG Quick Break Mechanism Type TLF Dial Switch Type TLF Quick Break Mechanism Bypass Arresters Bushings 5400W BushingsPR4018-06 PR4018-05 PR4018-04 October

21-115532-001 specifications

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