Megavolt Amperes (MVA) power is a unit used for measuring apparent power. The apparent power refers to the total current and voltage in an electrical circuit. The term is preferred in descriptions of total electrical power in installations, and it captures both true and reactive power in an electrical circuit. It is the common rating used in major electrical installations, such as transformers and generators.
A substation is a part of an electrical generation, transmission, and distribution system. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions. Between the generating station and consumer, electric power may flow through several substations at different voltage levels.
Substations is owned and operated by an electrical utility, or by a large industrial or commercial customer. Generally substations are unattended, relying on SCADA for remote supervision and control.
A substation may include transformers to change voltage levels between high transmission voltages and lower distribution voltages, or at the interconnection of two different transmission voltages. The word substation comes from the days before the distribution system became a grid. As central generation stations became larger, smaller generating plants were converted to distribution stations, receiving their energy supply from a larger plant instead of using their own generators. The first substations were connected to only one power station, where the generators were housed, and were subsidiaries of that power station.
Our engineers have completed substation testing and maintenance including power transformers, switchgear from 600 V to 35 kV, overhead and industrial switches, reclosers, relays, breakers and regulators for over 20 different utilities and industrial customers. Testing and maintenance services have included 34.5 kV – 230 kV oil circuit breaker testing and maintenance, including bushing power factor, ductor, time travel, speed adjustments and other tests associated with maintenance activities. Power transformer testing and maintenance for transformers up to 80 MVA and 230 kV LTC testing and maintenance and metal-clad breaker testing and maintenance.