POWER SYSTEM ANALYSIS

1. Power System Reliability.
2. Recommendations to Comply Electrical Standards for good power quality; protecting life of equipment.

Short circuit calculations provide currents and voltages on a power system during fault conditions.

1. To design an adequate protective relaying system.
2. To determine interrupting requirements for circuit breakers at each switching location.
3. Prevent Breaker damages; improve reliability & Avoid Fire Hazard.

To efficiently and effectively de-energies faulted portion of the power system while causing minimum disruption to the remaining un-faulted section.

1. 1. Electrical System Reliability in fault conditions.
   2. Avoid stresses on electrical components.

The power flow study is an analysis of the system’s capability.

This study will determine

Voltage, current, real power, reactive power & Phase angles.

1. Safety for Human life/ Building/Equipment.
2. Overvoltage protection.
3. Voltage stability

The power flow study is an analysis of the system’s capability.

This study will determine

Voltage, current, real power, reactive power & Phase angles.

1. For planning and operation of power distribution system.
2. Reactive power management for PF correction.

Earth grid resistance, working principle

1. Safety for Human life/ Building/Equipment.
2. Overvoltage protection.
3. Voltage stability

SPD is designed to limit transient overvoltages of atmospheric origin and divert current waves to earth, so as to limit the amplitude of this overvoltage to a value that is not hazardous for the electrical installation and electric switchgear and control gear.

SPD eliminates overvoltages:

• in common mode, between phase and neutral or earth; in differential mode, between phase and neutral.

In the event of an overvoltage exceeding the operating threshold, the SPD

• conducts the energy to earth, in common mode;
• distributes the energy to the other live conductors, in differential mode.