Electrical transmission or interconnection systems – Personnel safety or limit control features
Patent
1977-02-08
1979-02-20
Schaefer, Robert K.
Electrical transmission or interconnection systems
Personnel safety or limit control features
307141, 361 1, H01H 700
Patent
active
041409299
ABSTRACT:
An air pressurizing and purging system for electrical equipment contained in compartments with safety checks and interlocks ensuring inhibition of main power circuit completion until purging pressure and fan operation are verified by a timer for a set period.
System failure initiates a trip after a delay to open the main power circuit.
Re-energization of the main circuit requires full purge and verification procedure once more.
REFERENCES:
patent: 2807755 (1957-09-01), Thayer et al.
Clarke Chapman Limited
Ginsburg Morris
Schaefer Robert K.
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