Rectifier Transformers Máy biến áp chỉnh lưu FRIEM Việt Nam

Rectifier Transformers Máy biến áp chỉnh lưu FRIEM  Việt Nam

FRIEM designs the complete Rectifier System granting reliability, availability and performance. The Rectifier Transformer is fully integrated in the System through a detailed Technical Specification and optimising the connection to the Rectifier.

• Specialised, experienced and well-proven manufacturers

• Type: liquid-filled or dry-type cast-resin • Capacity: up to 200 MVA

• Primary Voltage: up to 220 kV

• Connections: full-wave (bridge) and half-wave (double star) with IPT

• Tap changer: No-Load (NLTC) or On-Load (OLTC)

• Multi-pulse topologies available: 6, 12, 18, 24 and more pulses

• Cooling system: ON-OF/AN-AF-WF

• Regulating autotransformer available in the same tank to allow on-load coarse voltage regulation.

• Saturable reactors available in the same tank to allow on-load fine voltage regulation.

• Design, manufacture and tests according to IEC and IEEE/ANSI standards.

Designed to meet all types of environmental conditions

• Extreme temperatures from -50°C to +55°C

• Altitude over 4000 m asl

• Corrosive atmospheres

• Seismic zones

• Hazardous areas All cooling system types available, by means of mineral oil or less-flammable fluids, air or water external cooling mediums, natural or forced circulation.

Protection Features

• O/C, O/V, U/V, Phase Sequence Protection

• Full Temperature Monitoring and Thermal Protection

• Cooling Circuit Monitoring (Pressure, Flow, Leakage, Conductivity)

• On-line oil gas analysis (option) Special design for Rectifier Application

• Stray losses reduction: transposed cable

• On-Load Tap-changer: MR

• Stainless steel wall for high current bars

• Connections to Rectifier optimised: reduced bars and losses

• Interphase Transformer oil cooled

• Saturable Reactors oil cooled