What are microgrids?

Microgrids are stand-alone power generating, distribution, and storage systems which can be operated independently or connected to the primary utility grid. By locally optimising various generation sources, such as solar PV, gensets, the grid and energy storage, a microgrid can create a range of financial and environmental value streams for an organisation. This article describes […]

Powering the steel industry

Both metallurgical and other industrial plant processes, as well as large drive procedures depend on reliable, highly specialised transformers. In steel plants, for example, it is crucial to supply high currents for AC and DC electric as well as ladle furnaces. Electrolysis processes operate with heavy-duty rectifiers which are fed by rectifier transformers. Large drive […]

Commissioning and testing of differential protection for phase-shifting transformers

Due to the increasing demand to control power flow within our networks, more phase-shifting transformers (quadrature boosters) are being installed. The most important protection principle for transformers is differential protection. An additional phase-shift has to be considered by the differential protection to fulfill the requirements for selectivity. With two-phase faults outside of the transformer, an […]

Condition-based assessment of on-load tap changers

On-load tap changers (OLTCs) are a crucial element of utility networks, as they must operate in a precise fashion in order to maintain a constant voltage output. This must be achieved regardless of variation on input or load. OLTCs have been a weak link in many networks, as they deteriorate over time due to mechanical […]