The basis for reliable operation of the protection is precise and fast measurement of phase, residual and braking currents. As standard, it is equipped with a package of PAX relay outputs (a package of 4 strong and fast outputs). The protection reads phase currents, the status of the field terminal and performs possible trips using the trip circuits of associated field devices or dedicated µUTX3vL/SSZ acquirers via the Aabus interface. Busbar protection can be performed in a concentrated version by installing UTXvMSZ a and µUTX3vL/SSZ acquirers in one cabinet.

UTX3vMSZ+ is characterized by:

• downloading measurements, states and LRW activations from associated UTX devices via the AAbus interface;
• switching off circuit breakers in bays via associated devices;
• protection of up to 16 bays in a system of up to 4 rails;
• setting stabilizing characteristics for 5 zones (global + 4 basic);
• the ability to dynamically change the station’s working topology by monitoring the states of switches;
• a multi-processor digital measurement and decision-making system with four programmable groups of protection settings;
• function of presenting the field status on a graphic display with support for 15 fully programmable switches;
• 74 – station signaling functions UP, AL, AW;
• 33 – bay controller function with presentation of the bay status on a graphic display with support for 15 fully programmable switches;
• permanent control of the correctness of the terminal’s internal systems;
• three levels of password-protected permissions;
• registration of events and disruptions;
• function of synchronous sampling of analog inputs, time synchronization and real-time clock;
• device operating times;
• detailed reporting of the fault clearing process on the display and transmitted to the system;
• graphic display and 11-button keyboard and 16 LEDs (15 freely programmable);
• 32 logical functions with programmable modifiers to implement simple and complex algorithms;
• possibility of visualization, control and configuration via the SAZ 2000 program.