This module computes the motor start-up in unlimited networks and offers the possibility of simultaneous or time-delayed start-up for any desired number of motors. Motor Starting module can simulate different motor models, depending on the motor data entered and it also allows for start-up devices, such as star-delta starter, series resistor, transformer, soft starter, etc.

### General Characteristics

- Identification of motor parameters using the least square method from input values for torque, current and cos(phi) in function of the slip
- Saturation and eddy-current losses in the motor allowed for (linear or point-by-point)
- Libraries for standard motor data, plus additional extendable libraries for Me(s), I(s) and cosphi(s) are available
- Operating point computation for all non-starting motors in accordance with their load characteristics (Newton-Raphson)
- Automatic tap changing transformers are allowed for after a user-defined time-delay
- Load torque entered as a characteristic or as a linear or quadratic load torque curve
- Extendable Libraries for load torques are available

### Voltage Drop

This option calculates the voltage drop at time t=0.0 due to starting motors, thus less motor data and computation parameters have to be entered. Non-starting motors can be simulated by a user-defined load PQ (constant power) or shunt. Results of Voltage Drop Calculation are easily accessible:

- Overloaded elements, measuring instruments and protective devices or nodes with voltages outside a defined range are highlighted
- Results of the voltage drop computation are displayed in the single line diagram
- The motor data entered and the motor parameters computed can be accessed by clicking on the motor concerned in the single line diagram

### Results

Results contain information on preselected nodes and elements. Also, graphical output of the characteristic curves and time characteristics is provided. Results display (dimensioning, scaling, colors etc.) can be customized.

- Computation of voltage U(t) at predefined nodes and of l(t), P(t), Q(t) for predefined elements
- Computation of motor current I, load torque M, electromagnetic torque Me, active power P and reactive power Q as functions of time, or of the slip for starting-up and non-starting-up motors
- Result lists can be saved in text files
- Results can be saved in result files for evaluation by means of spreadsheet programs (such as MS-Excel)