Relay setting calculation for motor

It is recommended that the setpoints for your motor protective relaying application be determined by your local protection engineer. Stator and is separate from the overload model for calculating Thermal. Motor relay will use the calculated thermal capacity unless the RTD thermal capacity is higher.

This function will not trip the motor at the max point temp unless the average current is greater than the overload pickup setting.

Overload relay is the one of important device for motor control.

It can prevent our motor from overheat or winding burning due overload of ampere.

We need to setting the value of overload relay properly depend on our application and motor full load ampere.

If we setting low from FLA,it can cause motor trip . Unsubscribe from Lennon Ashton? Want to watch this again later? The program can be used directly from the CD or installed on the PC hard disk. To install the program, copy the REM 610.

Setting calculation tool, Instructions for use.

Thermal Overload Relay setting = 1 x Full Load Current (Line). Thermal Protection Algorithm Requirements ACCURACY Precise estimate of the motor thermal image SIMPLICITY Easy to understand and calculate thermal estimate . Motors must be operated at rated voltage and frequency, and the motor overload can then be calculated by comparing the actual motor current to the rated full load current. For calculating actual relay operating time, we need to know these following operation.

Step-From CT ratio , we first see the rated secondary current of CT.

All motor protection relays operate on the basis of current taken by the motor. Motor protection relay is used for high voltage area having the following features. This video covers how to calculate and set the motor overcurrent in your SMV Variable Frequency D. The present document discusses the effect of power factor (pf) correction of 3- phase asynchronous motors on the settings of motor protection relays.

The calculation of the corrected rated current of the motor , and the corrected . The motor is directly starte.

Inverse Time and Definite time Overcurrent Protection during motor running. The ROCelement has IDMT characteristics defined by equation (1) in accordance with IEC. INSTRUCTIONS FOR THE SETTING , TESTING AND COMMISSIONING OF.

Nomenclature of the symbols used on the face-plate. Operating curves and block drawing.