Products  /  Function  /  Transformer Regulation  /  2V165
Products  /  Series  /  μMATRIX  /  2V165


  • Large back lit display panel
  • System status LED indicators
  • Simple menu setting procedure
  • Wide auxiliary supply range with fail alarm contact
  • Self diagnosis and fail alarm
  • Size 4M56-S draw out case
  • Made in Australia

The 2V16x Series relays are designed for the control of motor driven on-load power transformer tap changers. The 2V165 Series relays are designed to monitor & control the tap changers of up to four (4) transformers connected on a common bus & operating in the master slave control configuration. Master follower parallel control schemes traditionally use auxiliary switches on the tap changers to determine out of step errors. While this is a reliable & proven technique there are two significant drawbacks:

1. Wiring complexity between the tap changer auxiliary switches

2. Requirement for matched tap changers

The first issue is overcome by replacing each tap changer auxiliary switch with a TPI transducer (2V200), which sends a frequency signal proportional to the tap position. This requires only two wires for each tap changer & is simply wired back to the 2V165. The second issue is overcome with a user specified tap position logic table in the 2V165 to allow non-matched tap changers to operate together. The tap position of each transformer is monitored as well as the raise / lower commands initiated by the selected master voltage regulating relay. The 2V165 responds by sending the appropriate raise / lower commands to each tap changer in accordance with the tap position logic table.


Changes introduced on the 2V165-S

  • Case length reduced by 18mm to suit 4M56-S case;
  • LED backlighting to reduce EMC emissions – contrast adjustment no longer required;
  • Front panel USB programming port to increase data transfer speed and improve compatibility with notebook PC’s;
  • Network communications port is now optional to maintain low cost of base model;
  • Network communication port maintained the optically isolated RS485 serial port but the RS232 configuration option has been deleted;
  • New current and voltage channels to improve measurement stability;
  • New status input option covering 18-275V AC and 300V DC range;
  • Updated switchmode power supply to reduce EMC emissions and improve transient overload protection;
  • Surface mount production technology to allow increased component density for additional functionality now and in the future.

What has not changed from the 2V165

  • I/O and basic functionality has been maintained;
  • Basic menu structure and operation has been maintained;
  • Electrical terminal mapping has not changed allowing existing wiring diagrams to be maintained;
  • Compatibility with existing application software back to version 0500 maintained;
  • Compatibility with existing uMATRIXwin programming software maintained;
  • Modbus RTU network communication protocol maintained Case size 4 has been maintained although the length has been reduced.
  • Made in Australia


This page is designed to provide the latest technical information and software downloads for the 2V165 Relay.

The compatibility of a specific software application version with a hardware Type Number can be verified from the Compatibility.pdf document.

Use the “Save File As” command to download the required ZIP file which contains four items:

.umx software file
.ump sample parameters setting file
.pdf functional description
.pdf Modbus allocation tables for network communications port

The last 4 digits of each .zip file is the software version number which can be checked against the issue level of a relay’s software by accessing the DIAGNOSTICS page from the front panel. This is done by pressing the DATA and SET buttons simultaneously, moving the curser over “VERSION” and pushing SELECT. To load a .umx or .ump file you need to connect to the relays RS232 port using a PC with the uMATRIXwin software.

uMATRIX Setting Files

View historical relay parameter setting (.ump) files


Application “A” Software, parameters & functional Description.


Application “C” Software, parameters & functional Description.

2V165-S Technical Bulletin