Novatek Electro India Pvt. Ltd.

Delhi, Russian Federation

We are Offering Numeric Motor Protection Device (ubz-302) ubz-302 Protects the Electric Motors in the Following Alarm Situations:- Low Quality Power Supply Voltage: Not Allowable Voltage Surges and Fluctuations, Phase Loss, Wrong Phase Sequence, Phase Imbalance of Phase/line Voltage, Phase Coincidences;- Mechanical Overloads (symmetrical Overload in Phase/line Currents);- Exceeding the Threshold for Reverse Current Sequence;- Non-symmetry of the Phase Currents in the Absence of Overload Which May Happen Either Due to Fault of Insulation of the Motor Coils or the Power Supply Cable. Ubz-302 Performs Comparison of Non-symmetry Coefficient for Reverse Sequence Current with the Non-symmetry Coefficient of the Voltage On the Reverse Sequence.- Disappearing of the Drive Torque of the Motor Shaft (dry Stroke for the Pumps) Protection On the Minimal Starting Current And/or Operation Current;- Long Lasting Motor Start or Blocked Rotor;- Checking the Level of Insulation Between the Stator and Motor Case Before the Motor Start;- Earth Leakage Protection of Stator Coils During the Motor Operation;- Thermal Overload Protection for the Motor (i2t);- Overheating Protection for the Motor Coils. Ubz-302 Performs Temperature Monitoring Using Built in to the Motor Temperature Sensors or the Temperature of the Motor Case Could Be Measured with the Use of External Temperature Sensors. for Every Type of Protection Mentioned Above Its Possible to Set Individually the Autoreclosing Parameters (allowed or Not Allowed to Start the Motor Automatically After Certain Type of Fault or Alarm Situation).ubz-302 Performs Protection of a Motor or Equipment By Operating with the Magnetic Coil of Contactor Which in Its Turn Commutates the Required Power Load. ubz-302 Has 2 Output Relays: Power Load Relay and Functional Relay. Presence of 2 Output Relays Gives the Possibility to Arrange Delta/star Switching, Turn On with the Delayed Start (cascade Turn On of Motors) and Remote Signalization. Ubz-302 Detects the Presence of the Currents When the Power Load Relay Contacts are Open and When the Functional Relay is in the Delta/star Mode. if These Currents are Detected Then Ubz-302 Indicates the Fault of the External Contactor that Turns Motor On. Ubz-302 Will Keep On Indicating this Fault Until It Will Not Be Deenergized (turned Off). data Transmission- Control Operation and Data Transmission Using Rs-485 Interface in Accordance with Modbus Protocol, - Control Operation and Data Transmission Using Rs-232 Interface.

We offer numeric relay, numeric motor protection device. The ubz-301 provides: a simple and accurate electromotor nominal current setting by nominal current standard scale; the electromotor operating current setting that differs from standard values; overload tripping with a dependent time delay (the current-time characteristic curve is plotted for a conventionally cold motor). The motor heat balance differential equation is being solved in the operation process. This approach enables to take account of the preceding electromotor status and to make a decision on heat overload presence with the maximum validity. This method also permits to allow for a motor start heating and to restrict (at the customer's option) amount of starts per unit time; shift of current-time characteristic curve along the current-axis and along time-axis as well; setting of trip thresholds for the minimum/the maximum voltage, line voltage & phase current imbalance, and also for automatic reset delay at the personal customer's discretion; fault type indication, the mains voltage presence indication, current range indication the unit is adjusted to, and load energization indication; the data exchange and transfer to the local computer network according to the rs-485 modbus record through the bo-01 exchange unit (bo-01 is supplied on order). descriptionthe unit is a microprocessor-based digital device that provides a high degree of reliability and accuracy. The unit doesn't need any auxiliary supply because it retrieves it's energy demand out of the measurement signal: it's self-powered by the voltage to be monitored. Simultaneous isolated independent monitoring for the mains voltage and phase currents permits to detect the type of occurring fault and to provide a different decision-making logic for each fault type. When the mains voltage faults occur the unit performs automatic load reset on return voltage parameters to normal operating conditions. If a fault is induced by abnormal condition inside the motor (phase current imbalance at the symmetrical power line voltage, leakage current presence etc.) restart is disabled. In other words it is a numeric motor protection relay. the unit comes with three toroidal current transducers (ct). Two of them are the phase/line current transducers (ct1, ct2), power phase cables are pulled through them. The third transducer is the differential current transducer (cb ct) that has an enlarged diameter, because three power phase cables are pulled through it.