Rectifier Transformers_Máy biến áp chỉnh lưu Friem

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