GE EXCITER / GENERATOR CONTACTORS

The IC2812 field controllers are for the application and removal of dc power from an exciter or generator field circuit. The controller consists of two Normally Open (NO) power circuits and one Normally Closed (NC) power circuit and associated control and protective relaying. The 2 NO contacts apply dc power to the machine field. The NC contact inserts a resistor in the field circuit to discharge the energy when the field power circuit is opened. The contacts are arranged in a make-before break configuration. The contactor is mechanically latched when closed, and can be electrically or mechanically tripped.

APPLICATION

Determine the Amperes of the Field at Full Load (AFFL) rating. This AFFL rating should be on the nameplate of the machine (exciter or generator) on which the field breaker is to be used. This AFFL rating determines which contator is applicable.

CONSTRUCTION

The controller is a non-drawout type, with a padlock feature to lock the contactor in the open position. The 900 amp and 2500 amp controllers are incorporated into an angle iron frame assembly with front cover which is designed for mounting inside a cubicle. The 265 amp assembly is based mounted. These controllers include auxiliary relays for remote functions, an antipump circuit and close and trip push-buttons mounted on the front cover.

The anti-pump circuit ensures that the contactor operates only once during the close operation. A total of 11 auxiliary circuits are available for interlocking. All devices are wired to a common terminal board.