Conventional Substation

Company ROCON provides most modern solutions for Power Transmission & Distribution network, comprising wide range of world-class numerical Intelligent Electronic Devices (IEDs) - Protection relays, Bay Control Units (BCUs), Transformer Monitoring and Automatic Voltage Regulation (MAVR) systems and Annunciators.


Power transformers as basic equipment in the Transmission and Distribution Network objects raised the development of modern and powerful MAVR systems.

The systems provide basic functions specially intended for Oil immersed Power Transformers:

  • Measuring and monitoring of electrical and technological parameters
  • Automatic Voltage Regulation (AVR) of Single/Parallel Power Transformers.

System architecture

MAVR offers two types of architecture oriented to the customer requirements:

  • With single device - see Fig.1
  • With Main unit placed in the Control room and Technological Information unit installed in a cubicle near the Power Transformers - see Fig.2

In case of parallel operating transformers the necessary information exchange between the RTUs of the different transformers is realized through the Station bus in the object via FO/Electrical Ethernet and IEC61850 protocol. In case of lack of Station bus the "Daisy Chain" for interconnection between the RTUs is applicable. The latter does not need switches and other communication devices.

MAVR main features

Maximum operational reliability and data security

The years of experience, high level of R&D team and the application of the decentralized architecture with high level of redundancy is a guarantee for the reliability and security operation of MAVR systems.

Individual customer solutions

On request, our experts are able to develop special solutions for customer specific requirements.

Easy updates and remote access

Firmware and configuration updates are available via Ethernet and/or USB connection with PC based MMI program.