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

The most serious faults in a power system usually refer to those that pose the greatest threat to system stability, equipment safety, and power supply reliability. Here are some of the most common types of serious failures in power systems and their effects:Three-phase Short CircuitThree-phase short circuit is one of the most serious faults in the power system, it occurs between the three phases of the wire or between one or more phases and the ground short. This fault will lead to a large short

GIS device definitionGIS is the abbreviation of Gas Insulated Switchgear, which is generally translated as a gas insulated fully enclosed combination appliance, usually using SF6 gas as the insulating medium. Includes circuit breaker (CB), isolation switch (DS), ground switch (ES, FES), BUS (BUS), current transformer (CT), voltage transformer (VT), lightning arrester (LA) and other high voltage components. At present, GIS equipment products have covered the voltage range of 72.5 kV ~1200 kV.Char

Purpose of Direct Current Power during StartupLimit the starting currentWhen an induction motor starts, if it is directly connected to an AC power supply, the rotor, being stationary, experiences a strong induced effect from the rotating magnetic field of the stator, resulting in a very large starting current.When a DC power supply is provided, it can alter the magnetic characteristics of the motor, thereby limiting the size of the starting current. For example, in some soft start devices, a spe

While bending a wire itself does not significantly affect its resistance, the situation becomes more complex when dealing with wound coils, such as those found in transformers, motors, or electromagnets. Coils are not just bent wires; their geometry and winding method affect their electromagnetic properties, particularly self-inductance and mutual inductance, leading to phenomena such as sparking that do not occur with ordinary straight wires.Reasons for Sparking in Wound CoilsInductive Effects

Electricity is prevented from passing through the insulation of wires due to the properties of insulating materials. Insulators are specifically designed to resist the flow of electric current, allowing for safe handling and control of electrical systems. Here's how insulators work to prevent electricity from flowing through them: Electron-blocking capability: Insulators are materials with low conductivity, meaning they do not readily allow electrons to move through them. This is because their a

A Ground Fault Circuit Interrupter (GFCI) socket is a protective device specifically designed to prevent an electrical shock. It can detect the leakage current in the circuit and quickly cut off the power supply when the leakage current exceeds a predetermined threshold to protect personal safety. There are many ways to determine whether the GFCI socket has electricity, and the following are some commonly used methods:Viewing lightMany GFCI outlets have an indicator light (usually red or green)

Effect of phase Angle on power system failureWhen a power system fails, the phase Angle between voltage and current changes. This change is essential for understanding and analyzing the operating state of the power system. The following is a detailed explanation of the effect of phase Angle in the case of failure:Change in phase Angle Fault type and phase Angle: A short circuit fault, whether symmetrical or asymmetrical, can cause a significant change in the phase Angle between voltage and curre

Why are high voltage transmission lines mostly single strand and not twistedThe design and material selection of high-voltage transmission lines are based on a variety of factors, including safety, efficiency, construction difficulty and cost-effectiveness. Here are some explanations for why high-voltage transmission lines are mostly single-stranded and not twisted:Safety and reliabilityHigh voltage transmission lines usually carry high voltage, which has extremely high requirements for safety a

Accuracy and calibrationFlux leakageIn open-close current transformer, the opening and closing of the iron core will lead to leakage of magnetic flux. Because the core is not a complete, continuous loop like a solid core transformer, part of the magnetic field line may escape through the gap. This can lead to inaccurate ratios. For example, if the transformer is designed with a ratio of 100:1 (the ratio of primary current to secondary current), magnetic flux leakage may bias the actual ratio, re

Analysis of reasons why the diameter of high voltage line is larger than that of low voltage lineThe diameter of the high-voltage line is larger than that of the low-voltage line, mainly due to the following reasons:Energy conservation and power matchingAccording to the law of conservation of energy, the transformer keeps the power constant while converting the voltage. Even at different voltage levels, the total power of input and output is the same 1. Since the higher the voltage, the smaller