UTXvP: Universal VT Bay Protection Relay

UTXvPis a comprehensive HV/MV (Bus section) VT Bay protection. It provides quick and effective operation for any PTP or PTG faults. Reliable operation of the device is based on precise and quick analog value measurements and precise voltage vector finding.
UTXvP is equipped with: 14 Bit A/C converters, serial transmission interfaces (RS 232 – supervising channel and RS 485 – using IEC 870-5-103 standard protocol), with optional optical fibre and/or network communication – TCP/IP.

UTXvP characteristics

  • Multiprocessor – functional measuring and decision-making system equipped with 3 alternative Setting Groups (Banks)
  • Galvanically insulated: (analog and digital) input and output signals
  • Two Phase-to-Neutral Overvoltage stages (2 x Uphase > T)
  • Two Phase-to-Neutral Undervoltage stages (2 x Uphase < T) 59N – Three residual Overvoltage (Neutral displacement) stages (3 x UE > T)
  • Negative sequence Overvoltage protection function
  • Four internal Underfrequency Load Shedding and two AutomaticReclose after Underfrequency Load Shedding stages (4 x UfLS + 2 x ARaUfLS)
  • Resistance Insertion Logic function
  • Capacitor Bank automatic switching logic
  • Station signalling functions: BDI, AL, EMT
  • digital inputs for signals arriving from external protection relays
  • LCD Bay Terminal screen, displaying actual Recloser(s), Earthing Switch(es) status – (fully programmable for up to 15 switches)
  • 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, operational Bay Terminal monitoring
  • Three-level password protection
  • Disturbance and event recording function (U1; U2; U3; UE + 16 x digital signals)
  • Analog signal synchro-sampling and external relay clock synchronization
  • Actual analog signal values (U; f) measurement, front panel visualization and full remote data transfer
  • Earth fault and protection relay operating time counters
  • Detailed fault monitoring, for either local or remote post-event clearing sequence evaluation purposes
  • Graphic (LCD) display, 11- key keypad and 16 LEDs (15 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

Phrases related to UTXvP:

  • MV voltage transformer bay protection
  • digital protection
  • protection relay
  • digital terminal
  • earth fault protection
  • underfrequency protection
  • earth fault relay
  • voltage protection
  • bay breakdown signalization
  • negative sequence signalization
  • recorder
  • uniform teleprotection interface
  • universal teleprotection interface
  • bay terminal

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