POWER LOSS PROTECTION FOR DRAWWORK ELECTRIC DRIVE Russian patent published in 2015 - IPC H02J3/24 

FIELD: electricity.

SUBSTANCE: device includes a control unit, which input is connected to input current of the switchgear busbar section, and the first, second and third timers with actuating units. Output of the maximum current control unit is connected to the first, second and third timers, at that output of the first timer is connected to the first, second and third actuating units and alarm module, output of the second timer is connected to the fourth actuating unit and output of the third timer is connected to the fourth actuating unit, at that the first, second and third actuating units are outputs of the first step of power loss protection, which act to switch off electric drives of the rotary table, drilling mud pump and top drive system, while the fourth actuating unit is an output of the second step of power loss protection, which acts to switch off the drawwork electric drive, at that the fifth actuating unit is an output of the third step of power loss protection, which acts to switch off the disconnect switch of the switchgear busbar section.

EFFECT: improving protection reliability and efficiency.

1 dwg