We are a leading service provider for the Power System Study which includes services like Load Flow Analysis Services, Transient Stability Analysis Services, Motor Acceleration Analysis Services and Short Circuit Analysis Services.
Load Flow Analysis to effectively maintain power voltage and power levels to prevent overloading, brownouts and under/over voltage conditions. In power engineering, the power flow study (also known as load-flow study) is an important tool involving numerical analysis applied to a power system. Unlike traditional circuit analysis, a power flow study usually uses simplified notation such as a one-line diagram and per-unit system and focuses on various forms of AC power (ie: reactive, real and apparent) rather than voltage and current. It analyses the power systems in normal steady-state operation. There exist a number of software implementations of power flow studies
The great importance of power flow or load-flow studies is in the planning the future expansion of power systems as well as in determining the best operation of existing systems. The principal information obtained from the power flow study is the magnitude and phase angle of the voltage at each bus and the real and reactive power flowing in each line.
Power Flow Methods
• Newton-Raphson method
• Gauss-Seidel method
• Fast Decoupled method
Load Flow Analysis helps to ensure that cables, transformers, transmission lines are sized appropriately to carry required load. To make sure that the transformer taps are set appropriately to obtain satisfactory voltage profile within the area of study.
Required when
• There is a significant plant expansion
• New local generation is or is proposed to be added
• New utility feed has been installed
• New large motors have been added to the system
• New transformers have been installed
• Addition of significant loads
Transient stability study is used to simulate faults and sudden load or generation impacts. The results identify system weaknesses, if any, and recommend critical time to isolate the local machine to avoid damage. Transient stability study is required when synchronous machines are installed.
Transient Analysis is performed to study system behavior as it moves from one state to the other.
Examples:
• Capacitor switching
• Voltage notching associated with rectification
• Transient recovery voltage imposed on breakers
• PWM drive tripping
Motor acceleration study ascertain proper starting and running of motors on load with given system inertia without causing tripping or instability in the system.
This analysis is needed to:
• Determine the impact on system voltage during starting
• Determine whether the motor start will start satisfactorily and come up to speed.
• If the system voltage drops down to <75%, all motors would drop from the bus and other sensitive loads may also trip.
Study needed when:
• For new installation.
• If customers reports problems such as sudden outage of sensitive loads and other motors.
Short circuit analysis is done ensure that the existing and newly installed breakers will not be overstressed or fail to protect under short circuit conditions.
Required if:
• There is a significant plant expansion
• New local generation has been added
• New utility feed has been installed
• New large motors have been added to the system
• New larger transformers have been installed
• Transformers have been replaced with lower impedance units
Protection Device Coordination is done to ensure that the breakers operate in a desired sequence. Breaker closest to the fault should be the one isolating the fault. Other upstream breakers should operate only if the closest breaker fails to open.
Required if:
• There is a significant plant expansion
• New local generation has been added
• New utility feed has been installed
• New large motors have been added to the system
• New larger transformers have been installed
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