Alstom Technology Limited

General Electric Technology Gmbh

Carsten Meinecke

Christian Gaede

Habib Taghizadegan

Frank Furch

The present invention relates to an on-load tap changer control method for a power transformer in a power system. The power transformer has a primary side for a connection to a first grid in which electric power is generated, and a secondary side for connection to a second grid in which electrical power is consumed, the power transformer being equipped with an on-load tap changer. The method includes measuring the voltage and current at least on the primary side (u, i) or on the secondary side (ui) of the power transformer, processing said measured voltages (u; u) and currents (i; i) in order to derive prospective reactive power at the output of the power transformer after prospective tap-change, comparing prospective reactive power to a predefined set-point, and&#x2014;initiating tap-change of on-load tap changer if prospective reactive power is closer to said predefined set-point than actual reactive power.

On-load tap-changer control method, excitation control system carrying out said control method and power excitation chain

The electric machine has a casing housing a stator and a rotor and containing a gas, and a dryer for the gas. The dryer is connected to the casing. The dryer includes a separation group, for separating humidity from the gas, a water accumulator, for at least temporally accumulating water discharged from the separation group, at least a detector for the water contained in the water accumulator.

Electric machine

The present invention relates to an on-load tap changer control method for a power excitation chain. The chain includes a generator, a step-up transformer equipped with an on-load tap changer and connected on the one hand to the output of the generator and on the other hand to a transmission bus, and an excitation control system with a generator automatic voltage regulator (AVRG) and one excitation limiter (OELG, UELG). The method monitors the excitation conditions of the generator, activates the one excitation limiter (OELG, UELG) when the monitored excitation conditions are outside a predefined range, and temporarily inhibits the change of step of the on-load tape changer.

On-load tap changer control method for a power excitation chain, related unit and power excitation chain comprising such unit

A power converter arrangement has two static switching element bridges that are alternatively operable and comprise static switching elements. The power converter arrangement has one housing that houses the two static switching element bridges; the housing has one cooling system for the static switching element bridges housed therein.

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Karlsruhe, Germany

Carsten Meinecke