EE-303C (AVR with IEC-61850 or MODBUS protocol)

Automatic Voltage Regulating Relay : EE-303C

Emco Electronics’ Automatic Voltage Regulating Relay type EE-303 is a Microcontroller based Relay used for regulating the secondary voltage of Power Transformer usi ng OLTC. Independent time delays can be set for first control pulse & subsequent pulses. Built-in TPI displays Tap no. of Power Transformer. In Manual mode, Tap Raise/Lower pulses can be given through the front panel switches. Test mode for self test of AVR, AVR Remote disable facility, Min, Max Voltage and Tap change count memory storage is availabl e. RS-232 and RS-485 (MODBUS)  communicati on facility is available in EE-303C


  • Communication features with industry standard protocol IEC-61850
  • Microcontroller based architecture
  • One RS-232 port on front panel
  • One RS-485 port on rear panel
  • User friendly frontend software for programming of parameters from Computer using RS-232 port
  • SCADA connectivity through MODBUS protocol using RS-485 port
  • Variables lik PT, KV, Min, Max, Tap No. and Tap Count can be monitored simultaneously on computer
  • Auto / Manual mode selection through software
  • LR and RR pulses through software in Manual mode of operation
  • Alarm conditions like UV, OV and Control Fail can be monitored on software
  • All the parameters can be simultaneously programmed in a single click through “Program All” feature available in software
  • Data logging of variables with Date and Time stamp facility when unit is connected to software
  • Search facility w.r.t. variables available
  • Printable Tabular and Graphical report for logged data


Related Projects
Contact Us

We're not around right now. But you can send us an email and we'll get back to you, asap.