Safety lighting means for use with a high intensity discharge la

Details Safety lighting means for use with a high intensity discharge la Safety lighting means for use with a high intensity discharge la

1990-03-16

1992-05-19

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Automatic substitution of the load device or electrode

Diverse-type load device or electrode substituted

315 88, 315135, 315136, 315276, H05B 4146

Patent

active

051151650

ABSTRACT:
This safety lighting arrangement is especially suited for use with variously rated HID light sources having current ratings ranging from relatively low to relatively high values. The safety light arrangement includes a current transformer having a magnetizable core, a primary winding inductively coupled to the core for connection in series with the primary circuit in which the HID light source is connected, and a secondary winding inductively coupled to the core. The core is saturable by the primary winding current present when the current through the HID light source is as low as the current rating of one of the relatively low rated HID sources. The safety light arrangement also includes a monitoring relay connected across the secondary winding and maintained in an activated condition when the primary winding is traversed by current producing saturation of the core. This monitoring relay is set to drop out when current through the primary winding and the HID source is interrupted by a power interruption. The monitoring relay controls an auxiliary light source serving as a safety light. An energizing circuit for the auxiliary light source is effective to operate the auxiliary light source when the monitoring relay has dropped out but is rendered ineffective to operate the auxiliary light source when the monitoring relay is activated.

REFERENCES:
patent: 3611432 (1971-10-01), Babcock et al.
patent: 3636404 (1972-01-01), Appleton
patent: 3737720 (1973-06-01), Willis, Jr.
patent: 3873882 (1975-03-01), Gershen
patent: 3927348 (1975-12-01), Zawadski
patent: 4047076 (1977-09-01), McNamara, Jr.
patent: 4099095 (1978-07-01), Turner

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