Abstract:

A power plant’s 1000MW unit YKK710-4W type primary fan passed the vibration test after overhaul. In the three months after, vibration kept increasing till over limit vibrating and threatened to unit operation safety. By vibration diagnostic and current spectrum analysis, the primary cause was found as the contact surface of adjusting washer was too small. After changed washer to proper size, this issue was solved.Damage extending and overmaintenance of generator was avoided. This shortened the maintenance period, reduced cost and effectively ensured equipment safety.

Key words:

YKK710-4W type primary fan motor, vibration diagnostic, power spectrum analysis, adjusting washer