Voltage Stabilisers
14 February 2023

To solve the voltage fluctuation problems of a large West African fertilizer producer, we manufactured and delivered a customized 4000kVA Sirius voltage stabilizer with ±20% input voltage range, designed on the specific requirement of our customer.

The voltage stabilizer was delivered complete with a Total Protection Kit, which includes:

  • Input circuit breaker
  • Output circuit breaker
  • By-pass switch

The construction and logistical challenge we had to face and solve was the imposing size of the magnetic parts required to handle the high power demand, which led to the assembly of the voltage stabilizer in a 6200x2000x2400h mm cabinet with a weight of about 13,000 kg.

The Sirius range of the highest-performance and most complete voltage stabilisers in our production, is encountering a lot of success on the market.

Sirius is available for powers ranging from 60 to 6000kVA, with ±10%, ±15%, ±20%, ±25%, ±30%, +15/-35%, and +15/-45% adjustment. The control logic is managed by two DSP microprocessors (one that implements the control and the other that manages the measurements) that stabilise the output voltage, adjusting the true-RMS (root mean square) thereof. The whole system is supervised by a third (bodyguard) microprocessor that checks the correct operation of the other microprocessors.

In addition to the generous size and additional protections, which make the equipment very reliable and durable, the user interface is undoubtedly another very important feature.

Consisting of a 10-inch, multilingual touch display (equipped with an RS485 port), it can provide information on the state of the lines upstream and downstream of the voltage stabiliser (voltage, current, power factor, active power, apparent power, reactive power, etc.), the operating state of the stabiliser (it displays all the information relating to each operating mode: on/off, adjustment limit reached, increase/decrease in adjustment, etc.), and any alarms (minimum and maximum voltage, maximum current, excessive temperature, etc.).

If connected to a network via Ethernet with an RJ45 cable, the display can, in addition, be remotely transmitted to a PC using VNC software. It is, in addition, possible to interface with the stabiliser using the Modbus TCP/IP protocol (a standard protocol in communicating between industrial electronic devices). The system is also equipped with two USB ports that can be used to download the data stored and upload software updates from the control card.

The interface possibilities widen with Ortea Cloud, the new Ortea platform for remotely monitoring voltage stabilisers.