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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
  • 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
  • What Is So Great About Synchronous Rectification?
    to both Figures 1A & 1B, at t0 the PWM turns Q1 off. The current through Q1 drops to zero and causes the magnetic field in T1 to collapse and the drain to source voltage of Q1 to rise. Due to the parasitic capacitance of Q1 and the reflected gate to source capacitor of Q2 and the externally installed
  • Solid-State Relays and I/O
    where switch life must be independent of the number of switching cycles, where switching times must be less than 2 msec, and for bounce-free or zero-current switching. They are also generally chosen for applications subject to severe shock or vibration. Solid-state relays (SSRs) control load currents
  • The hot and cold of LVDTs
    used for calibrating the LVDT output. This type of error is known as a zero-shift or scale-shift error. The effect is the same as adding or subtracting a small constant value to the calibrated output voltage. Rising ambient temperatures produce a higher resistance in the copper wire used
  • AC Motors
    ) carries the induced secondary current. Torque is produced by the action of the rotor (secondary) currents on the air-gap flux. The synchronous motor differs greatly in design and operational characteristics, and is considered a separate class of motor. Induction motors are the simplest and most rugged

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