Description
1. Product Overview
Part Number: 1MRK005904-FC, including revised variants 1MRK005904-GB, 1MRK005904-HB of the same base hardware platform
Manufacturer: ABBProduct Line: Digital protection and control IED belonging to ABB Relion 670 series, designed for power transmission & distribution networks, auxiliary power systems of power generation units. serving as the standard core protection spare part for switchgears in substation, thermal/hydropower plants and captive power stations of chemical & metallurgical industries.
Model Coding Definition
- 1MRK: General part number prefix for ABB relay protection IED products;
- 005904: Base model defining hardware motherboard, backplane bus and basic protection logic architecture;
FC: Suffix for hardware firmware & customized configuration, preloaded with feeder overcurrent, earth fault protection, voltage supervision and automatic bus transfer logic, matched with standard front display panel and rear terminal base.
Product Definition: All-in-one intelligent relay protection IED integrating fault protection, electrical quantity measurement, binary status acquisition, remote switching control, fault event recording and remote communication. It locally identifies and issues trip commands for phase-to-phase overcurrent, inverse-time overload, single-phase earth fault, over/undervoltage, frequency deviation and three-phase unbalance faults. Meanwhile, it collects analog data including current, voltage, power and electric energy, uploading information to substation SCADA, telecontrol master station and background monitoring system to realize unattended operation of distribution feeders. One single unit replaces multiple discrete electromagnetic relay protection loops, simplifying secondary wiring and cabinet layout significantly.
2. Six Core Hardware Functional Units
2.1 Protection Logic Calculation Unit
Equipped with 32-bit industrial real-time processor with solidified multi-stage protection setting logic, supporting definite/inverse-time overcurrent protection, residual earth fault protection, negative sequence unbalance protection, under-voltage blocking overcurrent, over/undervoltage protection, under-frequency load shedding, auto-reclosing and circuit breaker failure protection. All protection settings can be modified via front panel or upper configuration software. Trip command is issued within millisecond upon fault detection with fault type, timestamp and fault magnitude latched to prevent selective tripping, applicable to radial distribution lines, ring main units and incoming/outgoing feeder protection of auxiliary power systems.
2.2 High-Precision Analog Sampling & Metering Unit
Multi-channel high-precision transformer sampling circuits accept secondary signals from three-phase current, three-phase voltage and residual current CT/PT. Measurement accuracy reaches Class 0.2 and protection sampling Class 0.5. It calculates active/reactive power, power factor, four-quadrant bidirectional energy and total harmonic distortion, eliminating the need for separate energy meters and fulfilling basic power metering requirements.
2.3 Binary Input Status & Remote Control Output Unit
Multiple passive DI binary input channels acquire circuit breaker position, disconnector auxiliary contact, spring charging status, device alarm and protection setting switch status. Independent SPDT relay DO output contacts drive breaker closing/tripping, audible & visual alarm and auxiliary interlock loops, with hardware anti-maloperation lock for each output channel to avoid unintended tripping caused by electromagnetic interference.
2.4 Event Sequence & Fault Disturbance Recording Unit
Large-capacity non-volatile memory stores minimum 1000 SOE event logs with time resolution ≤1ms. Fault trigger initiates waveform recording capturing voltage & current waveforms several cycles before and after fault occurrence. Data is retained after power loss and can be exported via local USB or communication interface for post-fault analysis and line fault location.
2.5 Redundant Multi-Protocol Communication Unit
Dual independent Ethernet ports natively supporting IEC 60870-5-104, Modbus TCP, DNP3.0; reserved RS485 serial port compatible with IEC 60870-5-101, Modbus RTU. Dual-link hot standby ensures uninterrupted data upload upon single link failure, seamlessly connecting to substation telecontrol equipment, background HMI and intelligent operation & maintenance platforms for remote setting modification, firmware upgrade and parameter download.
2.6 Industrial Reinforced Environmental Adaptation Unit
Split front-rear modular structure: front panel for LCD display & keypad operation, rear section for terminal wiring base. Double-sided conformal coating against moisture, salt fog and corrosion is applied to PCB. Fanless enclosed heat dissipation prevents dust and moisture ingress. Aging-prone electrolytic capacitors are eliminated to withstand temperature fluctuation, dust, EMI and low-frequency vibration inside switchgears for 24/7 long-term maintenance-free continuous operation.
3. Technical Specifications
3.1 Basic Hardware Specifications
| Item | Specification |
|---|---|
| Part Number | 1MRK005904-FC |
| Series | ABB Relion 670 Feeder Protection & Control IED |
| Mounting | Standard 4U rack embedded installation |
| Dimension | 177mm(H) × 226mm(W) × 240mm(D) |
| Net Weight | Approx. 2.1kg |
| Power Supply | Universal AC/DC 88~264V wide-range input |
3.2 Core Sampling & Protection Electrical Parameters
- CT Input: Rated 5A/1A secondary, measurement Class 0.2, protection Class 0.5
- PT Input: Standard 100V secondary voltage input
- DI Channels: 16 passive dry contact inputs, compatible with 110/220VDC loop power supply
- DO Contacts: 8 SPDT relay outputs, rated capacity 5A/250VAC
- Inherent Trip Time: Instantaneous overcurrent operation time ＜25ms
- SOE Resolution: ≤1ms, event storage capacity ≥1000 records
- Disturbance Recording: 4 pre-fault cycles + 8 post-fault cycles waveform storage
3.3 Environmental & Safety Compliance
- Operating Temperature: -25℃ ~ +65℃
- Storage & Transport Temperature: -40℃ ~ +85℃
- Humidity: 5%~95%RH non-condensing, free of corrosive gas and salt fog deposition
- Dielectric Withstand Voltage: 2kVAC 1min between channels and chassis without breakdown
4. Product Advantages
- Integrated protection, control and metering architecture reduces quantity of secondary components inside switchgears, simplifies drawing design and on-site construction wiring, and minimizes potential fault points.
- Universal 88~264V AC/DC power input eliminates power type differentiation during project design, compatible with substation 220V DC control power and plant AC auxiliary power.
- Dual Ethernet redundant communication with automatic link switchover prevents monitoring system disconnection and loss of remote data, meeting high-reliability networking requirements of substation integrated automation systems.
- Optimized earth fault detection algorithm accurately locates single-phase earth fault on neutral ungrounded/arc suppression coil grounded distribution networks, solving the difficulty of fault line selection of traditional protection devices.
- Chinese graphical LCD HMI enables on-site checking of real-time electrical measurements, protection settings, fault records and communication status without background software for convenient field inspection and parameter configuration.
- Full hardware backward compatibility with GB/HB suffix variants of the same base platform. Only configuration file re-download is required for direct drop-in replacement with identical terminal pin definition and no cabinet rewiring needed.
5. Application Scenarios
1. Urban Power Grid 10kV Ring Main Units & Distribution Feeder Switchgears
Main protection for overhead and cable distribution feeders, implementing short-circuit trip, auto-reclosing and bus transfer logic, connected to distribution automation master station for remote grid management.
2. Thermal & Hydropower Plant Auxiliary Power 6kV/10kV Incoming & Feeder Circuits
Protection for transformer low-voltage outgoing feeders and motor drives for pumps & fans, executing overload, short-circuit and phase-loss trip with data interconnection to plant DCS and auxiliary control systems.
3. Captive Power Plants & Main Step-Down Substations in Chemical & Metallurgical Industry
Incoming line protection for high-voltage distribution systems of chemical parks, adapting to heavy EMI environment caused by inverters and large motors to guarantee uninterrupted critical production power supply.
4. Rail Transit, Data Center & Commercial Complex High-Voltage Power Distribution Rooms
Main incoming protection, bus section protection and ATS logic control for Class-I loads to minimize power outage scope upon fault occurrence.
