Month: April 2014

Medium Voltage Switchgear : The Essentials


In an electric power system, switchgear is the amalgamation of electrical disconnects circuit breakers, fuses or switches used for controlling, protecting and isolating electrical equipment. Switchgears are used both to de-energize tools for allowing work to be done and to clear faults downstream. This kind of equipment is straight linked to the dependability of the electricity supply.

The very initial central power station used was an easy open knife switch; which was mounted on insulating panels of asbestos or marble. Power levels and voltages swiftly escalated, making opening physically operated switches too risky for anything other than isolation of a de-energized circuit. Oil-filled tool permitted arc energy to be contained and carefully controlled. By the early in 20th century, a Medium Voltage Switchgear line up would be a metal enclosed structure with electrically functional switching elements, utilizing oil circuit breakers. Nowadays, oil-filled equipment has mostly been replaced by air-blast, SF6 equipment or vacuum, or letting large currents and power levels to be securely controlled by an automatic equipment integrating protection, digital controls, communications and metering.


Electrical Substations: The Basics

electric substations

A substation is a division of an electrical generation, distribution and transmission system. Substations convert voltage from high to low, or the overturn, or execute any of numerous other vital functions. Between the generating station and customer, electric power might flow through several substations at varied voltage levels.

Substations might be owned and operated by an electrical efficacy, or might be owned by a large commercial or industrial client. Usually substations are unattended, relying on SCADA for remote control and supervision.

A substation might include transformers for changing voltage levels between the lower distribution voltages and high transmission voltages, or at the interconnection of two varied transmission voltages. The word substation comes from the being prior the distribution system became a grid. Since central generation stations became larger, smaller generating plants were transformed to Electrical Substations, receiving their energy supply from a larger plant despite of utilizing their own generators.


Switchgear: The Fundamentals

Switch gear

In an electric power system, switchgear is the mixture of electrical disconnects fuses, switches or circuit breakers used for controlling, protecting and isolating electrical tools. Switchgears are used both for de-energizing equipment to let the work to be done and to clear off the faults downstream. This kind of equipment is directly connected to the dependability of the electricity supply.

Usually, switchgears in substations are situated on both the low-voltage and high-voltage side of large power transformers. The switchgear present on the low voltage side of the transformers may perhaps be situated in a building, with intermediate voltage circuit breakers for the distribution circuits, alongside with metering, protection and control equipment. For industrial applications, a switchgear and transformer line-up may possibly be united in one housing known as USS or unitized substation.

Switchgears are as aged as electricity generation. The initial models were very ancient: all constituents were merely fixed to a wall.