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  • Circuit Breaker Selective Trip Coordination in 225A and 400A Distribution Panelboards (.pdf)
    With the increase of transformer size in the data center, much higher levels of available fault current are being seen. The use of "zero-crossing" circuit breakers to handle these faults, often in the range of 16,000 to 30,000 amps, is not advisable. All too often, the main circuit breaker trips
  • What Is So Great About Synchronous Rectification?
    Figure 1A shows a block diagram of a forward converter with an SDSR output. The SDSR consists of Q2 and Q3, which are directly driven from the secondary of the power transformer T1. The timing diagram and the associated voltage and current waveforms of Figure 1A are given in Figure 1B. Referring
  • Ground-fault interrupters
    as an example of how these switches operate. Phase and neutral power conductors pass through a toroidal (differential) current transformer. Under normal conditions, the vector sum of the currents in the live and neutral conductors will equal zero. In an unhealthy circuit a residual current flows
  • AC Motors
    A synchronous and synchronous motors are the two main categories of ac motors. The induction motor is a common form of asynchronous motor and is basically an ac transformer with a rotating secondary. The primary winding (stator) is connected to the power source and the shorted secondary (rotor

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