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

The floor - mounted tank - type circuit breaker is a crucial control and protection device in substations and power systems. It is mainly used to interrupt, close, and carry normal load currents in lines, and to cut off short - circuit currents during system failures. Composed of components such as interrupting elements, insulating bushings, bushing - type current transformers, arc - extinguishing chambers, operating mechanisms, and grounding casings, the arc - extinguishing chamber of the floor

Technical Explanation of Sulfur Hexafluoride (SF₆) Circuit Breakers and Gas Liquefaction ChallengesSF₆ circuit breakers, which use sulfur hexafluoride gas—known for its excellent arc-quenching and insulating properties—as the arc-extinguishing medium, are widely applied in power systems. These breakers are suitable for frequent operations and scenarios requiring high-speed interruption. In China, SF₆ circuit breakers are basically used for voltage levels of 110kV and above. H

The Biot-Savart Law is employed to determine the magnetic field intensity dHnear a current-carrying conductor. In other words, it describes the relationship between the magnetic field intensity generated by a source current element. This law was formulated in 1820 by Jean-Baptiste Biot and Félix Savart. For a straight wire, the direction of the magnetic field adheres to the right-hand rule. The Biot-Savart Law is also referred to as Laplace’s law or Ampère&rsq

A fuse is a device employed in electrical circuits to protect electrical equipment against overloads and short circuits. It is the simplest and most cost-effective component for interrupting an electrical circuit when exposed to short-circuit currents or excessive overloads.Fuses are used for overload or short-circuit protection in high-voltage systems of up to 66 kV and low-voltage systems of up to 400 V. In certain applications, their use is limited to scenarios where their performance charact

A fuse is a current-interrupting device that breaks or opens a circuit by melting its element when the current in the circuit surpasses a specific value. Fuses are predominantly categorized into two types: high-voltage fuses and low-voltage fuses. Low-voltage fuses can be further divided into two subtypes: semi-enclosed or rewirable fuses, and fully enclosed cartridge fuses.Rewirable FusesRewirable fuses, commonly referred to as kit-kat fuses, are widely utilized in residential wiring and small-

Abnormal Operating Conditions and Causes of Induction MotorsThree-phase induction motors are widely used in industrial applications. Their abnormal operating conditions and causes can be summarized as follows:Abnormal Operating Conditions and Causes of Induction MotorsThe following are the abnormal operating conditions and causes of induction motors:Mechanical Overload Blockage in Pump/Gear Systems: Obstruction in mechanical systems (e.g., pumps or gears) connected to the motor. Damaged Bearings

What is a High Rupturing Capacity (HRC) Fuse?A High Rupturing Capacity (HRC) fuse is a type of protective device used in electrical systems to safeguard against overcurrent and short-circuit faults. It is engineered to safely interrupt high-magnitude fault currents without causing damage to surrounding equipment or itself. HRC fuses can reliably handle and clear large fault currents, typically up to 80 kA or higher, while eliminating risks of explosion or fire.An HRC fuse contains a fuse element

DefinitionThe maximum value of the reverse voltage that a PN junction or diode can withstand without damage is termed thePeak Inverse Voltage (PIV). This PIV rating is specified and explained in the datasheet provided by the manufacturer.However, if the voltage across the junction under reverse bias exceeds this specified value, the junction will be damaged.As shown in the figure above, a PN junction or diode is commonly used as a rectifier, i.e., to convert alternating current (AC) to direct cu

Causes of Transformer FiresTransformers can catch fire due to several critical issues, includingexcessive overheating,severe short circuits,faults in the insulating oil, andlightning strikes. While transformer fires are relatively uncommon, their consequences can be devastating. As depicted in the figure below, a transformer engulfed in fire is often irreparably damaged within minutes. However, it is crucial to address the potential impact of such fires on adjacent equipment and structures, as p

IntroductionAtmospheric lightning strikes on overhead lines, bare conductors, or metallic structures in outdoor substations, as well as overvoltages caused by switching operations of equipment and networks (switching overvoltages), pose significant hazards to electrical equipment. To protect equipment and facilitate insulation coordination,surge arresters(also known as "lightning arresters") must be installed at the incoming/outgoing points of overhead lines and in close proximity to transformer