英文字典,中文字典,查询,解释,review.php


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       


安装中文字典英文字典辞典工具!

安装中文字典英文字典辞典工具!










  • Three Phase Resistance Imbalance Warning - PdMA
    It is not unusual to see a large three-phase induction motor with phase resistances perfectly balanced or close, with imbalances calculating well below 0 1% This being the case, the balance of resistance measurement can be a super sensitive indicator of the changing condition of the motor windings
  • Phase unbalance and why it matters - Maintenance and Engineering
    Current unbalance can be caused either by a voltage unbalance or by a problem with the wiring to the motor, a fault in the motor, or the behaviour of the driven machine Unequal resistances in the cabling to the motor can result in lower current in one phase
  • Acceptable imbalance at starting of a 3-phase motor (480V)
    Measure your phase to phase voltages and use that to assess whether you have an unbalance supply problem If your supply voltage is balanced within 1% and you have a current unbalance in excess of 6-10%, then you may have a problem with the motor
  • Protection of three-phase motors from unbalance (loss of phase and . . .
    The most common cause of unbalance for three-phase motors is the loss of phase resulting from an open fuse, circuit breaker, connector, or damaged conductor Unbalances in other connected loads can also affect the motor
  • Good to Know, Motors and Electrical Flashcards - Quizlet
    The maximum current imbalance of a 3 phase motor is _____ % 10% To find current imbalance use the same steps to find the percent of voltage unbalance Instead use current readings
  • Three-Phase Voltage Imbalances - ABB
    Unbalanced voltages can cause problems for motors and Variable Frequency Drives (VFDs) Motors that are run across-the-line would require a significant derate depending on the amount of voltage imbalance that is present in the system The graph below shows the derating curve from NEMA MG1 14 36
  • when the three phase are balance | Information by Electrical . . .
    Phase imbalance at each panel shall not exceed 5% Voltage Drop for branch circuits shall be limited to no more than 3%; voltage drop for branch and feeder circuits combined shall be limited to no more than 5%
  • Current and Voltage Unbalance- causes and counter measures
    Unbalance is calculated in terms of maximum deviation of current in a phase from the mean of three phases To calculate the percentage deviation- [1] Besides, an unbalance can also be quantified by comparing the intensity of negative sequence currents in comparison to the positive sequence currents


















中文字典-英文字典  2005-2009