Current transformer TG

instrumentdryprotection

Gas-insulated instrument transformer for enhanced safety and reliability TG is a gas-insulated high voltage current transformer based on a top-core design, able to withstand current up to 4,000 A and designed for voltages from 72.5 to 800 kV. Primary and secondary windings are located inside the upper part of the transformer. Some important features of the product are: • Suitable for both metering and protection • Short primary conductor with low thermal losses suitable for high rated current • Magnetic cores made of laminated steel with oriented grain and a high level of permeability • Windings made of electrolytic copper • Safety margin for normal wind loads, stress from conductors and seismic forces • Remote control of the internal insulation level by means of pressure gauge provided with an alarm threshold and lock threshold • A pressure relief device protects the apparatus from internal overpressure Applications • Revenue metering • Protective relaying • System control and indication of power flow Why Hitachi ABB Power Grids? For the TG combination of SF6 gas insulation and with a composite insulator, offers several advantages: • Explosion-proof design • Non-flammable • Absence of partial discharge • Dielectric mean not subjected to aging • Higher performance in very heavily polluted environments • Maintenance-free • Life cycle of 30 years