抄録
Induction motors are used extensively in many plants, and play important roles. Especially, in nuclear power plants, there are about one thousand and three hundreds induction motors. In order to keep health of them, the technologies of condition monitoring and diagnostics, which are simple and high-integrity, is needed. In recent years, the technologies of condition monitoring and diagnostics with signals of acceleration and current are introduced in nuclear power plants. With a view to verifying condition monitoring and abnormal diagnosis technology for the important instruments as induction motors and pumps, Japan Nuclear Energy Safety Organization (JNES) has installed the equipments for abnormal simulated tests in Japan Nuclear Safety Training Center (JNTC), and JNES has tested abnormal diagnosis technology by experiments. So far, JNES has evaluated the applicability of monitoring and diagnostics technology with signals of acceleration and current. We tested abnormal simulated induction motors of bent shafts and bearing outer ring creep, which are difficult to detect from outside in operation, and we made sure of effectivity of leakage flux analysis. Here we report the facts.
