UTXvA protection relay consists of μUTXvL/3 module cooperating with UTXvCTC type container charged with fault current and equipped with additional “R” ballast unit. The device is dedicated to protect High and Medium Voltage CB Bays. It provides quick and effective CB
tripping while PTP fault or guaranteed voltage fading will be detected. Reliable operation of the device is based on precise and quick analog value measurements, resulting in fast currents vectors finding. UTXvA is equipped with: 14 Bit A/C converters, serial transmission interfaces (RS 232 or RS 485 – using IEC 870-5-103 standard protocol), with optional optical fibre and/or network communication – TCP/IP.
Individually configured UTXvA relay is intended for protecting CB Bays (Overhead Line/ Underground Cable, Feeding HV/MV Power Transformer, Auxiliary Voltage MV/LV Transformer, MV Bus Coupler, Capacitor Bank).

Device characteristics – μUTXvL/3 module designed to cooperate with UTXvCTC

  • multi-processor digital measuring and decision-making system equiped with three groups of protection settings
  • galvanically insulated inputs and outputs (analog and digital)
  • four overcurrent measuring stages for each phase: directional or non-directional (4 x I>)
  • negative sequence overcurrent protections
  • second harmonic phase current compound detector
  • simplified overcurrent substation bus protection function
  • freely programmable substation circuit breaker failure protection function
  • neutral point – automatic resistance insertion logic
  • capacitor bank automatic switching logic
  • four shot, six mode, three pole AR cycle for any protective or logic function
  • station signalling functions: BDI, AL, EMT
  • fully programmable digital inputs for signals from external protection relays
  • CB switching onto fault (SOTF) protection logic
  • LCD bay terminal screen, displaying actual (CB, bus and line reclosers, earthing switches) status
  • each protection stage can be set as signal operating only (operational report)
  • analog signal vector stabilization and compensation (due to unstable fault evolving) for precise and selective fault detection
  • permanent monitoring of bay internal element operational status/ condition
  • three-level password protection
  • event and disturbance recording (3 x I; 16 x digital signals)
  • analog signal synchro-sampling and external clock synchronization
  • permanent monitoring of CB operational circuits (1 x ON; 2 x OFF)
  • CB internal operational status (ready/ failure) monitoring and remote control
  • analog current value measurement front panel (local) visualisation and remote data transfer
  • CB currents tripping (per phase bassis) cumulative function, number of operations and protection relay operating time
  • detailed fault monitoring, for local/remote fault clearance evaluation
  • graphic LCD display, 8-key keypad and 12 LEDs (11 freely programmable)
  • 32 logic functions with programmable modifiers for realization of simple and complex algorithms
  • possibility of visualization, control and configuration by SAZ 2000 program
  • possibility of cooperation with Alice`79 system

The configuration described above is minimal (3 x currents measurement). UTXvA device is also available with all other µUTXvL versions with max up to eight analog inputs, which allows full functionality of protection relay.

µUTXvL – read more …