First house protector for voltage regulators and the like

A control circuit for limiting the output of voltage regulating equipment, such equipment including a drive means, said control circuit comprising:

• a. means for sensing the output of voltage regulating equipment;
• b. a first voltage divider fed by said sensing means;
• 1. said first voltage divider having means for setting a desired upper limit of the output,
• c. first operating means actuated by an overvoltage from said setting means of said first voltage divider;
• d. first relay means, said first relay means energized by said operating means to block further operation of the drive of the voltage regulating equipment in a direction to increase the voltage output of the voltage regulating equipment and;
• e. time delay means connected to said first operating means to prevent immediate de-energization of said first relay means when said divider voltage drops below said preset limit;
• f. a second operating means, said second operating means actuated by a further overvoltage from said first voltage divider, said second operating means energizing a second relay,
• 1. said second relay effective to cause the drive means of the voltage regulating equipment to drive the voltage regulating equipment to reduce the output voltage,
• g. a second voltage divider, said second voltage divider having means for setting a desired lower limit of the output;
• h. third operating means actuated by an undervoltage from said setting means of said second voltage divider;
• i. and a third relay means energized by said third operating means to block further operation of the drive means of the voltage regulating equipment in a direction to lower the voltage output of the voltage regulating equipment.