µUTXvL series 3 is designed to protect cable and overhead feeder bays, the main transformer bay, auxiliary needs, the coupling and the capacitor bank bay.
The basis for reliable operation of the protection is: precise and fast measurement of analog quantities and precise calculation of voltage, current and ground admittance vectors.
The device is standardly equipped with a package of PAX relay outputs (a package of 4 strong and fast outputs).

• multi-processor digital measurement and decision-making system with three groups of protection settings;
• galvanic separation of individual inputs and outputs (analog and digital);
• 50/51/51A/67 – four phase overcurrent stages, directional or non-directional (4 x I>);
• 59 – two phase overvoltage stages (2 x U>);
• 27 – two phase undervoltage stages (2 x U<); 32 – one power feedback stage (P>);
• 32VAR – one stage of reactive power compensation (Q<>,tg<>);
• 50N/51N – three non-directional earth overcurrent stages (3 x Io>);
• 59N – three earth overvoltage stages (3 x Uo);
• 67N – two directional earth overcurrent stages (2 x Iok>);
• 21N – one ground admittance stage (RYo, RBo, RGo);
• 21N – one incremental admittance earth stage (RYYo);
• 50/51 – two non-directional overcurrent stages against internal short circuits (2 x Ig>);
• 46/47 – current and voltage asymmetry;
• 50H/51H(2) – second harmonic phase current detector;
• 50/51 – implementation of simplified ZS bus protection;
• 50BF/51BF – fully programmable LRW breaker reserve system;
• 81L/81H – four internal stages SCO and two SPZ/SCO (4 x SCO, 2 x SPZ/SCO);
• four external stages SCO and SPZ/SCO (4 x SCO, 4 x SPZ/SCO);
• 79N – AWSCz automation;
• 79C/86 – ABK automation;
• 79(3) – four-step, six-program AR automatic for any protection or logic function;
• 74 – station signaling functions UP, AL, AW;
• 30/74 – possibility of connecting external protection devices to binary inputs;
• 11 – protection function of switching off the line when switching on a short circuit;
• 33 – bay controller function with presentation of the bay status on a graphic display with support for 15 fully programmable switches;
• ability of each stage to act on a signal (activation report);
• vector stabilization and intermittent fault compensation for precise and selective fault determination;
• permanent control of the correctness of the terminal’s internal systems;
• three password-protected permission levels;
• event registration and disturbance recording (4 voltages, 4 currents and 16 digital channels);
• function of synchronous sampling of analog inputs, time synchronization and real-time clock;
• constant control of the continuity of circuits breaking and/or closing the circuit breaker;
• cooperation system with a switch (control of continuity, charging and anti-pump interlocks) and remote control;
• measurement of quantities – I, U, S, P, Q, f, Ep, Eq and visualization on the controller display with the possibility of transmitting them to the system;
• WZ trip counters, device operating times and the function of summing the currents switched off by the switch;
• detailed reporting of the fault clearing process on the display and transmission to the system;
• graphic display and 11-button keyboard and 16 three-color LEDs (15 freely programmable);
• four-quadrant electricity meters;
• 32 logical functions with programmable modifiers to implement simple and complex algorithms;
• possibility of visualization, control and configuration via the SAZ 2000 program.