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BOMBARDIER DCC2223A 3EST125-977
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ABB DCF804-0050
ABB DCF804-0050

ALSTOM DCC2382A 3EST125-975

Product Introduction:​ Part of ALSTOM Grid’s MiCOM P440 series — a numerical protection relay for HV/EHV transmission lines, also deployed in generator excitation control & monitoring applications. Provides main & backup protection plus control logic.
Technical Specifications:
  • Hardware Platform:​ MiCOM P446
  • Voltage Regulation Accuracy:​ ±0.5 % (excitation mode)
Category:
Description
  • Response Time:​ ≤ 50 ms dynamic load change
  • Analog Input Resolution:​ 16-bit
  • Rated Voltage (protection I/O):​ 690 V AC 3-phase (excitation variant) / 110 V / 220 V DC aux
  • Continuous Current:​ Up to 200 A (excitation module rating, overload 1.5× for 30 min)
  • Communication:​ Modbus, Profibus DP, IEC 61850(GOOSE/SV/MMS), IEC 60870-5-103
  • Fiber Optic Ports:​ 2 × ST/LC for differential protection channel
  • Ethernet:​ Dual 10/100 Mbps with PRP/HSR support (option)
  • Operating Temp.:​ -20 °C to +60 °C (some -25 °C to +55 °C)
  • Protection Degree:​ Front IP54, rear IP20
  • Certifications:​ IEC 60255, KEMA, UL, CE
Key Features:
  • Integrated distance (4-step), directional overcurrent, breaker failure, auto-reclose
  • Optical fiber current differential (87L) as main protection
  • Full IEC 61850process bus ready
  • Dual-redundant power supplies (some versions)
Applications:​ HV transmission line protection (110 kV–765 kV), synchronous generator excitation regulation & monitoring, substation bay control.
Installation Notes:​ Follow ALSTOM/MiCOM wiring diagrams for CT/VT burden limits; use screened twisted pair for communication; set IEC 61850GOOSE addressing before energizing; periodic relay self-test recommended.
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