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

1 Resistive Superconducting Fault Current Limiter1.1 Operating PrincipleAs power grid scales continue to expand, the short-circuit capacity of domestic power systems is rapidly increasing, posing significant challenges to grid construction and operation. To address the problem of excessive short-circuit currents, superconducting fault current limiters (SFCLs) based on superconductivity principles are receiving growing attention. Depending on their damping characteristics when transitioning into

1 IntroductionTo meet the rapidly growing demand for electric energy, power generation, transmission, and distribution systems must develop accordingly. One of the critical issues arising from this development is the rapid increase in short-circuit currents. The rise in short-circuit currents leads to several hazards:overheating of series-connected devices along the fault path;increased transient and recovery voltages during current interruption, which may damage insulation systems;generation of

1. How to Judge Whether the Temperature Change of a Transformer is Normal or AbnormalDuring operation, losses in the transformer’s core and windings are converted into heat, causing temperature rise in various parts. This heat is dissipated through radiation, conduction, and other means. When heat generation and dissipation reach equilibrium, the temperature of each part stabilizes. Iron losses remain nearly constant, while copper losses vary with load.When inspecting a transformer, record

1. Operation of the System With and Without CLiP (Current-Limiting Device)Under normal operating conditions, the switchboard operates as follows:All bus tie breakers are closed, connecting the three bus sections in parallel;Two generators are online and supplying power to the switchboard.Under this configuration, the prospective fault current at the switchboard is less than 50kA. Therefore, the current-limiting device (CLiP) is not inserted into the circuit.During maintenance operations involvin

I. Voltage Transformer (VT)Voltage Transformer (Potential Transformer, abbreviated as PT; Voltage Transformer, abbreviated as VT) is an electrical device used to transform voltage levels in power circuits.1. Operating PrincipleThe voltage transformer operates on the principle of electromagnetic induction and has a structure similar to that of a conventional transformer, consisting primarily of a primary winding, a secondary winding, and a core. The primary winding is connected in parallel to the

Low-voltage power distribution lines are widely used across various industries, and the distribution environments are complex and diverse. These lines are accessed not only by professionals but also frequently by non-specialists, significantly increasing the risk of faults. Improper design or installation can easily lead to electric shock (particularly indirect contact), damage to wiring, or even electrical fires.The grounding system is a critical component of low-voltage distribution networks&m

Comprehensive maintenance is crucial for ensuring the safe and stable operation of high-voltage power distribution systems. Key maintenance requirements include: First, utilizing operational maintenance to achieve SCADA system data monitoring and acquisition, ensuring that system operating parameters meet established constraints under normal conditions. Second, implementing maintenance to carry out Demand Side Management (DSM) and Load Management (LM), optimizing the load curve to prevent overlo

Fault PhenomenonA power distribution system fault occurred in a customer's server room, resulting in damage to some IT equipment and instruments. Upon receiving the feedback, our company's engineers immediately rushed to the site to inspect the power distribution system and analyze the cause of the fault.Fault InspectionThe server room uses a three-phase five-wire power supply system. Two three-phase input, three-phase output UPS units (without output isolation transformers) are operating in par

In the daily operations of an enterprise, the stable operation of electrical equipment is crucial. As a key step in changing the operational state of electrical equipment, the accuracy and standardization of switchgear operations directly impact equipment safety, production continuity, and personnel safety. Therefore, it is essential to enhance the level of switchgear operations and ensure that the operational procedures are standardized and precise.I. Definition and Importance of Switchgear Ope

Thunderstorm DayHazard PointsLightning rod drop and back - strike injuring peopleArrester explosion injuring peopleOutdoor terminal box and gas relay getting rainwaterControl MeasuresWear qualified insulating boots and stay at least 5m away from the lightning rod.Wear safety helmets properly and do not approach arresters to check action values.Keep terminal boxes and mechanism box doors tightly closed, and ensure the gas - proof rain shields are in good condition.Prohibit holding umbrellas when