Differential Generator Control Relay for D-C Aircraft Electric Systems

The definite-pickup. type of generator control relay has been in use for a period of years on d-c aircraft electrical systems. While this type of generator control relay gives satisfactory operation when the system is in proper adjustment, it had disadvantages which are accentuated by improper adjustments of regulators and the relays. A differential type of generator control relay not subject to chatter has been developed and tested in flight on a system having four main-engine-driven generators and an auxiliary power plant. This type of relay has been shown practical and advantageous when used on a system having voltage regulators with equalizers.