Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

General photovoltaic control system schematic

Deal with the harmonic problem in the grid connected system of photovoltaic power generation

Earthing DefinitionEarthing of electrical transmission towers is defined as a safety measure where each tower is grounded to prevent electrical hazards.Footing ResistanceMeasuring the footing resistance ensures it is below 10 ohms, crucial for tower safety.Pipe EarthingIn the pipe earthing system, we use a galvanized steel pipe that is 25 mm in diameter and 3 meters long. The pipe is buried vertically in the soil, with its top 1 meter below ground level. If the tower stands on rock, the earthing

What is the Resistance of Earth?Earth Resistance DefinitionAn earth electrode is a metal rod or plate that is buried in the soil and connected to the earth terminal of an electrical system. It provides a low-resistance path for fault currents and lightning surges to dissipate into the ground. It also helps to stabilize the voltage of the system and reduce electromagnetic interference.Earth electrodes can be made from materials like copper, steel, or galvanized iron, chosen for their conductivity

What is a Shunt Reactor?Shunt Reactor DefinitionA shunt reactor is defined as an electrical device used in high voltage power systems to stabilize voltage during load changes.Voltage StabilizationIt controls dynamic overvoltage and provides capacitive reactive power compensation in systems above 400kV.Impedance TypesShunt reactors come in gapped core or magnetically shielded air core types to maintain constant impedance and avoid harmonic currents.Loss Measurement MethodsLosses of a shunt reacto

What is a Phase Synchronizing Device?Phase Synchronizing Device DefinitionA Phase Synchronizing Device (PSD) is defined as a device that synchronizes the switching of circuit breaker poles to the zero crossing of the phase voltage or current waveform.Controlled Switching DeviceAlso known as a Controlled Switching Device (CSD), it ensures accurate timing during circuit breaker operations.Voltage and Current SynchronizationThe PSD uses voltage and current waveforms to identify zero crossings and s

Arc Suppression Coil DefinitionAn arc suppression coil, also known as a Petersen coil, is an inductive coil used to neutralize the capacitive charging current in underground power networks during an earth fault.Purpose and FunctionThe coil reduces the large capacitive charging current during an earth fault by creating an opposite inductive current.Working PrincipleThe inductive current generated by the coil cancels out the capacitive current, preventing arcing at the fault point.Capacitive Curre

Shunt Reactor DefinitionA shunt reactor is defined as an electrical device that absorbs reactive power in power systems.Reactance CalculationThe reactance of a shunt reactor can be calculated as it is nearly equal to its impedance.V-I CharacteristicsThe simple formula of impedance in ohm isWhere, V is voltage in volt and I is current in ampere.But in the case of shunt reactor, impedance Z = reactance X.Where, V is applied voltage across the winding of the reactor and I is the corresponding curre

Shunt Reactor DefinitionA shunt reactor is used to neutralize excess capacitive reactive power on long electrical transmission lines.Core of Shunt ReactorShunt reactors typically use a gapped core, built from Cold Rolled Grain Oriented Silicon Steel to cut down on hysteresis losses. The steel sheets are laminated to lessen eddy current losses. Radial gaps, placed by high electrical modulus spacers between lamination packets, enhance efficiency. Typically, a 5-limb, 3-phase core structure in a sh

What is Electrical Reactor?Electrical Reactor Definition: An electrical reactor, also known as a line reactor or choke, is a coil that creates a magnetic field to limit current rise, reducing harmonics and protecting electrical drives from power surges.Types of Electrical or Line ReactorsA reactor has many roles to play in an electrical power system. The reactors are normally classified according to their modes of application. Such as: Shunt Reactor Current Limiting and Neutral Earthing Reactor