Electrical Power Quality

Пособие LPQI AG Окт 6th, 2008 by Издатель Прикладное руководство по Качеству электроэнергии Power Quality Application Guide This page has the following sub pages. Зарубежные источники информации: LPQI AG на английском языке Раздел 1 Введение 8.1 Введение Раздел 2 Затраты Раздел 3 Гармоники Раздел 4 Устойчивость Раздел 6 Заземление и ЭМС Раздел 8 Децентрализованная генерация и возобновляемые источники энергии

В России может появиться энергетическая полиция Ноя 24th, 2008 by Издатель Edit | В проекте Закона о внесении изменений в Федеральный Закон "Об энергосбережении" появилось понятие "энергетическая полиция". Предполагается, что этот или подобный (в зависимости от окончательных формулировок утверждённого Закона) орган будет обеспечивать принуждение к исполнению. положений Закона.

Fires that broke out at an electricity substation and a transformer left 40,000 people without electricity in Madrid on Thursday.

The conflicting objective in these regulatory documents is clear. One document, the PDC, specifies that the DUs must comply with PQ limitations per section 3.2 in all connection points.  On the other hand, the Guideline points that only 95% of those connection points must be ensured by the DU to have PQ level in accordance with the PDC section 3.2.

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The shortage of electricity in London datacentres is forcing hosting companies and large organisations to build datacentres close to substations with spare power. Locations outside the M25 in Surrey, Hertfordshire and Essex are favoured for datacentres housed in shipping containers.

The Green Grid is a consortium of information technology companies and professionals seeking to lower the overall consumption of power in data centers around the globe. The organization is chartered to develop meaningful, platform-neutral standards, measurement methods, processes and new technologies to improve energy efficient performance of global data centers.

According to state wildlife official Sunil Kumar, the drunken pachyderm electrocution incident took place last Friday in Chandan Nukat, a village some 240km west of Meghalaya state's capital Shillong. Kumar said: "There would have been more casualties had the villagers not chased them away."

Islanding phenomenon is undesirable because it leads to a safety hazard to utility service personnel and may cause damage to power generation and power supply facilities as a result of unsynchronized re-closure. In order to prevent the phenomenon, various anti-islanding methods have been studied. Until now, frequency or start phase shift methods of inverter current have much attention as active anti-islanding methods, which cause reactive power variation to the utility. However, these methods deteriorate usually the power quality like power factor or harmonic performance. This paper proposes a high power quality active anti-islanding method using effective power variation, which is implemented by periodically increasing/decreasing variation of inverter current magnitude. If it causes the large variation of inverter output voltage after islanding, active frequency drift (AFD) method as a simple anti-islanding method will be injected into the inverter current for a designed period and islanding can be detected. In case of large voltage variation when the grid is connected, AFD method will be removed after the designed period. Unlike most active anti-islanding method deteriorating power quality, the proposed method will have high performance of islanding detection and good power quality. For the verification of the proposed method, simulated results and experimental results in addition to analysis are presented using a 3 kW PV inverter.

The Electricity Supply Monitoring Initiative (ESMI) as an effort by Prayas (Energy Group) to empower ordinary consumers to monitor electricity supply quality, i.e. supply interruptions and voltage profile, at the consumer end. Under this initiative specially developed data loggers, which are installed at different locations in an area, record voltage as well as supply interruptions. This is a tool for consumers and regulators to get an idea of the ground reality and to increase the accountability of electricity utilities.

Fluke is offering a free educational Power Quality DVD which can be requested via the Fluke web site. It focuses on the best use of power quality tools to prevent equipment failure and downtime in industrial applications.

In this configuration, the Pentadyne system is the first line of defense against all power issues, isolating the batteries from any such events.

This tutorial provides an overview of three phase electricity basics and then discusses three of the most common power quality events: leading/lagging power, saq/swell/interruptions, and harmonics.