ALSTOM 029.147.908 Transformer Differential Protection Relay

Product Brief Description

ALSTOM 029.147.908 is a numerical transformer protection relay from MiCOM series, specially developed for two-winding power transformers. It adopts percentage differential protection with harmonic restraint to avoid mal-operation caused by magnetizing inrush current. This relay integrates main differential protection and full set backup protection functions, realizing fast fault isolation and transformer equipment safety protection for power substations and industrial power systems. We supply fully inspected surplus and refurbished units for power system maintenance and emergency spare replacement.

Product Features

• Percentage differential protection (87T) with 2nd & 5th harmonic restraint for transformer inrush current blocking
• Restricted earth fault protection, overcurrent, negative sequence overcurrent, overfluxing and thermal overload protection
• Supports automatic CT ratio and transformer vector group matching, up to 5 groups of protection setting groups
• High-precision fault disturbance recorder and event logger with 1ms high-resolution time stamping
• Multiple communication protocols: IEC 61850, Modbus RTU, DNP3, IEC 60870-5-103 for SCADA connection
• Front LCD and keypad for local parameter setting, real-time measurement viewing and fault history query
• Refurbished relays pass differential characteristic test, analog injection calibration and full functional inspection before shipment

Application Scenarios

• Step-up & step-down power transformers in utility power substations
• Large industrial plants, petrochemical and mining internal power distribution transformers
• Substation automation transformer protection and monitoring units
• Transformer protection for wind farm and solar station booster stations
• Preventive maintenance, relay replacement and spare parts inventory backup for power facilities

FAQ