Tap changer position indicator
Tap changer position indicator AWZ-1 is dedicated to visual indication of current position of tap changer of HV/MV transformer. The device is equipped with 24V DC inputs for receiving coded position purpose. Following coding standards are available: BCD, “BCD Energopomiar”, Binary, Gray or custom defined by the user. The device is equipped with relay outputs, which allows to transmit tap number coded in different standard. Relays are able to work under different operating voltage ex. 220 V AC/DC. Available output coding standards are as follows: BCD, Binary, Gray or custom defined by the user. Coding and uncoding of tap changer position number is used in cooperation with voltage regulation system of HV/MV transformer bays.

Manuals, diagrams, technical details


Product description


Main features

The device is equipped with:

  • four independent communication ports i.e.:
    • one ST port (820 nm – fiber optic, multimode)
    • two RS485 ports (protocols: ZEG/IEC 870-5-103)
    • one USB port located on the front panel (for device setting purpose)
  • in order to transfer data between AWZ indicators, the communication ports allows to connect the devices. It allows to send data at considerable distances and transfer it to SCADA
  • possibility to receive code from the transmitter by RS485 port or by fiber optic port using serial communication protocol
  • LED RGB segment display allows to choose displaying color with number dependent distinction
  • possibility to colour signaling dependent on warning condition (example manner: one before last tap – yellow, last tap – red, normal tap – green, or in any different manner)


Rated supply voltage 110-230V DC/AC
or other on request
Input voltage 24V DC/AV
or other on request
Number of binary inputs 8/16
Burden in binary inputs 0,3W/input
Burden of supply voltage <10W
Number of relay outputs 7
Continous contact carry of relay outputs 4 A
Breaking capacity 3 A(250V AC); 0,2 A(220V DC)
Communication ports  RS-485(2x), fiber-optic ST, USB
Dimensions (width x height x depth) 144mm x 96mm x 110mm
Weight 1,1 kg
Rated insulation voltage 2,5 kV; 50 Hz; 1 min
Overvoltage category II
Ingress Protection degree IP40 / IP20
Ambient temperature -5÷40 °C
Mounting flush

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