Internal pressure explosion-proof system

Details Internal pressure explosion-proof system Internal pressure explosion-proof system

1990-09-27

1992-09-08

DeBoer, Todd E.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307328, 361 2, 174 11R, H02B 13055

Patent

active

051461056

ABSTRACT:
An internal pressure explosion-proof system by which an electric motor or the like is not rendered operative until after gas in an airtight vessel is replaced with certainty by protective gas. The internal pressure explosion-proof system includes a gas flow detector provided in an exhaust pipe for detecting an amount of protective gas exhausted from an airtight vessel in which an electric appliance which may produce a spark or fire is accommodated, and a controller for enabling operation of the electric appliance when a flow amount detected by the gas flow rate detector when protective gas is fed into the airtight vessel reaches a predetermined level and the internal pressure of the airtight vessel exceeds another predetermined level.

REFERENCES:
patent: 3934454 (1976-01-01), Simo
patent: 4607245 (1986-08-01), Kuroda et al.
patent: 4802502 (1989-02-01), Williams

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