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Voltage Symmetrization System
Voltage Symmetrization System (VSS) was developed especially for electric power networks with great phase voltage unbalance. It is a three-phase system which enables earth-fault current and charging current elimination. Until now, the operation with earth-fault current compensation has been very complicated for the networks with a great voltage unbalance. In the past, it was necessary to operate such networks with an isolated neutral, solid grounding or with a significantly untuned arc-suppression coil. VSS can also substitute for an arc-suppression coil or it can complement it parallelly. Moreover, it contributes to a better function of earth-fault protections for high-resistance earth faults by equalizing phase-to-earth capacity unbalance. The VSS was patented.European Patent EP 1817829 The three-phase VSS has several basic functions: * In a faultless condition: # Symmetrization of phase voltage, i.e. elimination of phase voltage unbalance realized by controlling the phase-t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Power Transmission
Electric power transmission is the bulk movement of electrical energy from a generating site, such as a power plant, to an electrical substation. The interconnected lines that facilitate this movement form a ''transmission network''. This is distinct from the local wiring between high-voltage substations and customers, which is typically referred to as electric power distribution. The combined transmission and distribution network is part of electricity delivery, known as the electrical grid. Efficient long-distance transmission of electric power requires high voltages. This reduces the losses produced by strong currents. Transmission lines use either alternating current (HVAC) or direct current (HVDC). The voltage level is changed with transformers. The voltage is stepped up for transmission, then reduced for local distribution. A wide area synchronous grid, known as an "interconnection" in North America, directly connects generators delivering AC power with the same rela ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phase Unbalance
Phase or phases may refer to: Science *State of matter, or phase, one of the distinct forms in which matter can exist *Phase (matter), a region of space throughout which all physical properties are essentially uniform *Phase space, a mathematical space in which each possible state of a physical system is represented by a point — this equilibrium point is also referred to as a "microscopic state" **Phase space formulation, a formulation of quantum mechanics in phase space *Phase (waves), the position of a point in time (an instant) on a waveform cycle **Instantaneous phase, generalization for both cyclic and non-cyclic phenomena * AC phase, the phase offset between alternating current electric power in multiple conducting wires **Single-phase electric power, distribution of AC electric power in a system where the voltages of the supply vary in unison **Three-phase electric power, a common method of AC electric power generation, transmission, and distribution *Phase problem, the l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
