SAGS AND SWELLS
Detecting the presence of harmful Sags and Swells
    Key features include:
  •   Advanced substation data recording
  •   Capturing event and fault data in high resolution
  •   Ability to detect harmful sags and swells
  •   Compatible with full suite of Fischer Block sensor devices
  • DATASHEET
    DETECTING SAGS AND SWELLS
    Voltage Swell is defined by IEEE 1159 as the increase in the RMS voltage level to 110% - 180% of nominal, at the power frequency for durations of 1/2 cycle to one (1) minute. Voltage swell is basically the opposite of voltage sag or dip. Voltage swells are characterized by their RMS magnitude and duration. The gravity of the PQ problem during a fault condition is a function of the system impedance (i.e. relation of the zero-sequence impedance to the positive-sequence impedance of the system), location of the fault and the circuit grounding configuration.

    Voltage swells can be caused by the deenergization of a very large load due to an abrupt interruption of current, per the formula: V = L di/dt, where L is the inductance of the line and di/dt is the change in current flow. Moreover, the energization of a large capacitor bank can also cause a voltage swell, though it more often causes an oscillatory transient. Although the effects of a sag are more noticeable, the effects of a voltage swell are often more destructive. It may cause breakdown of components on the power supplies of the equipment, though the effect may be a gradual, accumulative effect. It can cause control problems and hardware failure in the equipment, due to overheating that could eventually result to shutdown. Also, electronics and other sensitive equipment are prone to damage due to voltage swell.
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