Description
CT secondary rated: 1 A / 5 A configurable
VT secondary rated: 100 V
System frequency: 50 Hz / 60 Hz
Auxiliary supply: 80‑250 V DC / 85‑265 V AC wide‑range power
Total power consumption: ≤32 W
Local HMI: Front‑panel graphic LCD display, LED status indicators and operation push‑buttons
Communication interfaces: Fiber‑optic interface for line differential protection, SPA bus, LON bus, IEC 60870‑5‑103 serial port
Fault recording: COMTRADE disturbance waveform storage, large‑capacity sequential‑of‑event log
Mounting mode: Panel flush‑mount installation for protection cabinet
Operating temperature: −25 ℃ ~ +70 ℃
Storage temperature: −40 ℃ ~ +85 ℃
Humidity: 5‑95 %RH non‑condensing
EMC compliance: IEC 60255‑22‑1 /‑22‑2 /‑22‑3
Certifications: CE, UL, IEC 60255 approval
Line differential protection (87L) with CT‑saturation resisting algorithm, communication channel supervision for differential link. Distance protection, directional / non‑directional phase overcurrent protection, earth‑fault protection, negative‑sequence overcurrent protection, breaker‑failure protection. Configurable auto‑reclosing function. Realize local & remote circuit‑breaker control, bay‑level interlock logic and trip‑circuit supervision. Complete high‑accuracy measurement of current, voltage, active/reactive power and energy. Embedded programmable logic for custom interlock functions. Sequential‑of‑event logging, COMTRADE disturbance recording and multi‑setting‑group management. Continuous hardware self‑diagnosis detects plug‑in board faults and uploads alarm status to local HMI and station control system. Parameter configuration and commissioning are completed via REL55 engineering toolManualsLib。
Flush‑panel mounting inside protection cabinet. Strictly comply with CT/VT polarity for secondary wiring, strictly prohibit CT secondary open‑circuit risk. Auxiliary power supply shall be kept within rated voltage range. After unit or board replacement, download complete project configuration file. Perform differential protection communication channel test, protection logic verification test, breaker trip‑close loop test, binary input/output point‑to‑point signal test and communication test with upper‑level SCADA system. Confirm no hardware self‑diagnosis fault alarms.
Main protection for overhead‑line and cable transmission lines in power plants and utility substations. Suitable for radial, ring and meshed transmission network schemes.
- Protect‑IT series numerical line differential protection terminal, rear plug‑in slot‑type board design for convenient on‑site spare‑part replacement.
- High‑performance line differential protection with CT‑saturation resisting capability and communication‑channel supervision.
- Abundant backup protection functions including distance, overcurrent and breaker‑failure protection.
- Embedded programmable logic to realize customized interlock logic and reduce external hard‑wiring.
- Integrated measurement, event‑logging and COMTRADE disturbance‑recording functions.
- Multiple communication interfaces supported for differential channel and substation automation system.
- Discontinued legacy ABB spare‑part, for maintenance and retrofitting of existing REL551‑series line‑protection devices。
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