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Low-voltage capacitor banks Dynacomp

Thyristor-switched capacitor banks for power factor compensation of fast varying loads

The Hitachi Energy's Dynacomp low-voltage thyristor-switched capacitor banks are used for ultra-rapid transient free power factor compensation due to fast varying or large low-voltage connected loads, giving additional benefits of transient-free compensation and voltage dip minimization. With Hitachi Energy's Dynacomp technology large capacitor steps can be connected to the network very fast.  By using a step-up transformer the Dynacomp can be used for capacitive compensation in medium-voltage installations too.


The Dynacomp low-voltage thyristor-switched capacitor banks can be used in any applications requiring short response times, large number of operations, transient free switching or large amount of reactive power. For example:

  • Spot welding machines
  • Rolling mills and big presses with fast switching loads
  • Cranes
  • Lifts
  • Rubber mixer
  • Saw mills and tunnel drills which have very high switching rates

Why Hitachi Energy?

Hitachi Energy has a vast experience in compensating fast reactive loads in the harshest environments.  As a result, the Hitachi Energy's Dynacomp boosts high reliability and comes with:

  • Ultra-rapid power factor compensation
  • Usable in the harshest environments
  • Equipped with detuning reactors for optimal protection against harmonics while still giving filtering effect
  • Single and three phase models available
  • Transient-free switching
  • Very high number of switching operations possible thanks to power electronics switches
  • Modular and compact standardized design
  • Easy to install and extend
  • Advanced communication features with Modbus

Brief performance data

Rated voltage From 380 to 690V - three or single-phase
Frequency 50 or 60 Hz
Rated power From 150 kvar to 12.8 Mvar
Step size 50, 100, 200 and 400 kvar
Maximum power per cubicle 400 kvar
Detuning reactor 7% for three-phase system
14% for single-phase system
Communication Using Modbus RTU
Response time Closed loop: < 3 cycles
Open loop: < 1 cycle
External trigger: instantaneous
Working ambient temperature -10°C to +40°C max. average
Installation Free floor standing
Protection degree IP21 (touch proof with open door)
Execution Indoor installation in clean environment up to 1000 m altitude
Humidity Maximum 95%, non condensing
Capacitors  CLMD type

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