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

In the selection process of low-voltage circuit breakers, the following critical factors must be considered:Rated Current and Short-Circuit Breaking Capacity are fundamental to proper selection. According to relevant standards, the rated current of a circuit breaker should be equal to or greater than the calculated load current, with an additional safety margin (typically 1.1 to 1.25 times). Meanwhile, the short-circuit breaking capacity must exceed the maximum prospective short-circuit current

Live-line spraying of PRTV on insulatorsTo ensure the safe operation of transmission lines and effectively prevent pollution flashover, the company's live-line work team recently responded to the local power supply bureau's requirements by conducting live-line spraying of PRTV coating on insulators of relevant transmission lines, equipping the insulators with a bright red "protective coat." The live-line spraying operations were mainly carried out in industrialized towns in central and western C

1. Characteristics of Fully Insulated SF₆ Switchgear1.1 OverviewFully insulated SF₆ switchgear comprises functional units such as load switches, load switch-fuse combinations, disconnectors-circuit breakers, etc., all sealed within stainless steel gas boxes filled with low-pressure SF₆ gas. This gas serves both as the arc-quenching and insulating medium. The switchgear employs electric or manual spring-operated mechanisms. Each cabinet is an independent gas box, allowing for expansion through bu

1 Research on Cable Laying and Wiring Construction Technology of Photovoltaic Power Station1.1 Data CollectionBefore constructing the BIM model for cable laying, it is necessary to deeply master the detailed parameters of the involved equipment specifications, materials used in construction, and site conditions, aiming to improve the accuracy of model construction. To ensure that the BIM model can accurately reflect the actual situation of the construction site, the core lies in accurately colle

A certain special transformer manufacturing enterprise, which has been producing special transformers such as split - phase - shifting rectifier transformers, rectifier transformers for electrolysis, and transformers for submerged arc furnaces for more than 20 years. Now, an evaluation is made on the production process flow and its characteristics of the special transformers after the company's transformation.1.Production Process Flow Chart of Special TransformersThe production of special transf

1 Relevant Theories of Small Neutral Point Reactors in 500kV Substations1.1 Definitions and RolesA reactor is a key power system component that controls the phase relationship between AC current and voltage, divided into inductive and capacitive types. Inductive reactors limit short-circuit currents and improve stability; capacitive ones enhance transmission efficiency and voltage quality. A small neutral point reactor is a specialized type connected between a three-phase system's neutral point

In real-world engineering projects, selecting and installing 35kV combined instrument transformers isn't just a matter of "buying and installing" — it requires a comprehensive evaluation of many factors, such as environmental conditions, equipment performance, and maintenance convenience. Only by taking all these aspects into account can we ensure that the equipment runs safely and stably for a long time under specific conditions.1. Oil-Immersed vs. Dry-Type Transformers — Wh

The installation quality of combined instrument transformers directly affects whether they can operate safely and stably. Therefore, during the installation process, several key aspects must not be overlooked — such as foundation construction, grounding, sealing checks, testing and commissioning, as well as secondary wiring. Below, I’ll explain these points in a more conversational way.1. Foundation Construction Must Be Solid, Especially in Plateau AreasAlthough a combined in

1. Selection of Low - Voltage Current Transformer ConfigurationThere are many factors leading to wrong selection of low - voltage current transformers in civil construction projects. For example, common factors include design problems: the calculated coefficient designed for the load of electrical equipment is relatively large, or the transformation ratio of the current transformer is selected incorrectly. Such a series of reasons will affect the use of electrical equipment. Therefore, in the co

Hey everyone! I'm James, a professional with over 10 years of experience installing voltage transformers. Today, I want to talk about the selection and installation of Air Insulated Switchgear (AIS) voltage transformers in 66kV outdoor substations.These devices are critical for measurement and protection in power systems. Their proper selection and installation directly affect the safety and stability of the entire electrical grid. With the advancement of smart grid technology, electronic AIS vo