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

Wind power generation, as a renewable and clean energy source, has relatively mature technology and has witnessed rapid development in China in recent years. It is estimated that by 2010, the total installed capacity will reach 1.8×10⁴ MW. Wind power generation is characterized by a short construction period, quick results, and the most cost - effective advantages. Typically, it takes only about one year to build a 50 - MW wind farm. After completion, the operation cost is low, and the

1. IntroductionCurrently, with the rapid development of the economy and science and technology, and the increasing intelligence of the informatization level, the construction of substations is also becoming more and more intelligent. Among them, cable tunnels are an important means for substations to achieve intelligence. Therefore, in practical applications, higher technical and quality requirements are needed. For example, to meet the needs of complex signal transmission, the cable tunnels in

In recent years, medium-voltage vacuum circuit breakers have witnessed substantial development and achieved remarkable results, especially in the 12 kV voltage class, where vacuum circuit breakers hold an absolute advantage. Currently, the operating mechanisms commonly equipped with 12 kV outdoor vacuum circuit breakers are mostly spring operating mechanisms.At present, outdoor vacuum circuit breaker products often focus on the design and protection of the main circuit of the circuit breaker whi

Installation Requirements All parts and components must pass inspection before installation. Work - position tools and equipment used for installation must be clean and meet assembly requirements. When tightening fasteners, use fixed wrenches, box wrenches, or socket wrenches. Do not use adjustable wrenches when tightening screws near the arc - extinguishing chamber. The installation sequence should comply with the installation process regulations, and the specifications of fasteners for each co

A. Aerial MountingA1. Unit Capacities, Mounting Methods, and TypesFor aerial transformer installations, three - phase units or banked single - phase units can be used. Transformers, whether single or in banks, with an individual unit or combined capacity greater than 300 kVA shall not be mounted on a single wooden pole. Special structural considerations are required for single - pole installations with a capacity greater than 100 kVA.Pole - platform mounting (two - pole structure) will not be us

Definition of Transformer LossesTransformer losses can be mainly categorized into two types: no - load losses and load losses. These losses are ubiquitous across all types of transformers, irrespective of their application scenarios or power ratings.However, there are two additional types of losses: extra losses induced by harmonics, and losses that are especially relevant for larger transformers – cooling or auxiliary losses, which result from the use of cooling equipment such as fans

The characteristic data of distribution transformers are dictated by the requirements of the network. The determined effective power must be multiplied by the power factor cosφ to obtain the rated power Srt. In distribution networks, a value of uk = 6% is commonly preferred.Selection of Distribution Transformers for Supplying Power to LV NetworksTransformer losses consist of no - load losses and short - circuit losses. No - load losses stem from the continuous reversal of magnetization i

Preventing an interruption of serviceAs is known, distribution transformers reduce the distribution or primary feeder voltage to the utilization voltage. They are linked to the primary feeder, sub - feeders, and laterals via primary fuses or fused cutouts. When a transformer fault or a low - impedance secondary - circuit fault takes place, the primary fuse disconnects the associated distribution transformer from the primary feeder. Reclosers are not addressed in this article.The blowing of the p

Transformer ServiceThis guide comprehensively covers various aspects of distribution transformers. It delves into the construction elements, including the core, windings, cooling system, tank and cover, conservator, pressure relief device, Buchholz relay, silica gel breather, and winding temperature indicator. Additionally, it addresses topics such as transport, packing, and despatch processes, installation procedures, fittings and accessories, commissioning steps, as well as operation and maint

Good operating practices for switchgear circuit breakers and contactorsOperation of LV/MVSwitchgearThe aim of this guideline is to offer recommended practices for the operation and inspection of medium - voltage (2 - 13.8 kV) and low - voltage (200 - 480 V) draw - out switchgear circuit breakers and contactors. Well - regulated operation is of utmost importance for maximizing the performance and service of plant equipment, as well as ensuring a safe working environment for plant personnel.This a