NUMERIC LT MOTOR PROTECTION DEVICE UBZ-304

UBZ-304 Numeric electric motor protection device is designed for the protection of asynchronous LT motors having power of 2.5 to 315 kW (5A – 630A), with the use of external standard current transformers having output current of 5 amperes (secondary), works in power mains with isolated neural or with solidly grounded neutral terminals.

The device provides continuous monitoring of the mains voltage parameters and RMS phase/line currents of the three-phase electric equipment of 380V-415V 50Hz, as well as for the motor insulation resistance test. More than 90 parameters can be programmed/customized depending on application & usage with variable trip delay and auto-reset delays. Four-line function backlit LCD provides all information and eases programming from the front panel. Built RS-232 & RS-485 Modbus communication for DCS/ SCADA integration, realtime monitoring, programming, and remote control. The device comes with free PC software for real-time monitoring & programming. Universally accepted flush mounted 96 x 96 x 78.3mm overall dimensions.

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Feature of UBZ-304

 

  • over-current protection in phases;
  • ground fault protection (zero-sequence current);
  • phase current asymmetry (negative-sequence current);
  • for exceeding negative-sequence current factor to negative-sequence voltage factor;
  • thermal overload;
  • undercurrent protection in phases (dry-run);
  • delayed starting (rotor blocking);
  • overheating of windings (RTD inputs);
  • minimum line voltage;
  • maximum line voltage;
  • line voltage imbalance (negative sequence voltage protection);
  • improper phase sequence;
  • decreasing of mains frequency lower that setting;
  • for increasing of mains frequency higher the setting;
  • minimum insulation resistance of the motor winding;
  • motor phase loss (protection is operated when the motor current is disabled in one (two) phase).

Specification of UBZ-304

Power (Watts or HP) 2.5 – 315 kW (4 – 500 HP)
Motor Voltage 380 – 415 V AC
Motor Brand Any
Phase Three Phase
Speed (Rpm) Any
Voltage Type AC
Operating Voltage (V) 320 – 480 V
Number of Poles 3 Pole, 4 Pole
Application Three phase LT motor protection
Rated Current (Amps) 5A to 630A programmable
Output Type Functional – SPDT (1NO + 1NC) and Power – DPDT (2NO + 2NC)

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