Current transformer LVQB (40.5 - 550 kV)

LVQB 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 40.5 to 550 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

• Revenue metering
• Protective relaying
• System control and indication of power flow

For the LVQB combination of  SF₆ gas insulation and with a composite insulator, offers several advantages:

• Non-flammable
• Absence of partial discharge
• Dielectric mean not subjected to aging
• Higher performance in very heavy polluted environments
• Maintenance free