Ferroresonance is a nonlinear resonance phenomenonthat affects power networks. Circuit must contain at least below circuit elements as it can be definedas ferroresonance:

  • Non-linear saturable inductance (example; transformer)
  • Capacitor
  • Resistor

In a circuit consists of these elements; by changingthe values of an electrical component, the values of current and voltage values on the terminals at other components change suddenly.

Ferroresonance begins some switching events such as; load rejection, energizing or de-energizing of transformer, switching of circuit breaker. The causes risk to it can be listed as follows:

  • Idling or operation on low load on the systems grounded neutral point
  • Insulation faults
  • Overloading or idling of voltage transformer
  • Switching one or two phases
  • Dissymmetry caused by connection errors
  • Switching transformers or capacitors
  • Connecting low load power transformers to network with short circuit load
  • Long and / or capacitive cable feeding a transformer
  • Streak of lightning on transmission lines

Application Areas

  • Voltage Transformers
  • Power Transformers

Ferroresonance Technical Specifications

  • High cooling surface aluminum
  • IP5X protection degree
  • Stainless steel resistance element

Damping Technical Specifications

  • Different voltage up to 36 kV
  • Stainless steel resistance element
  • Optional protection degree from IP00 to IP55
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FR - Filter Resistor PDF 1 MB Download