Patent ID: 7429807
Filing Date: 2008-09-30
Classification: F04D,G21C,Y02E

Abstract:
1. An adjustable speed drive system for a primary loop recirculation pump, comprising: two adjustable speed drive systems, each being provided with a first breaker connected to a high voltage bus of unit auxiliary power supply system, an inverter connected to the first breaker via a transformer, a second breaker connected to an output side of the inverter, a gate driver that supplies a gate pulse to the inverter, and an inverter control portion that drives the gate driver; and a backup adjustable speed drive system, wherein when a malfunction detection portion detects a malfunction in a main adjustable speed drive circuit portion including the inverter and the gate driver in one of the two adjustable speed drive systems, the main adjustable speed drive circuit portion is switched to a backup adjustable speed drive system, and an operation of a recirculation pump motor for driving a recirculation pump that controls a flow of a reactor core is continued.