Description
I. Product Overview
GE 850-EP1NNG1LNNAANGSPHB3ACNBN is a high-performance intelligent feeder protection and measurement relay of GE Multilin 8 series. Integrated with protection, measurement, control, communication, waveform recording and event recording functions, it serves as the core secondary protection equipment for medium and low-voltage distribution systems, industrial power supply systems and substation feeders.
Adopting dual-CPU redundant operation architecture and high-precision fault discrimination algorithm, the device realizes rapid fault removal and accurate abnormal condition alarm for feeder lines. Fully compliant with power industry safety specifications, it supports IEC 61850, Modbus TCP/RTU and other mainstream protocols, as well as automatic reclosing, cold load pickup, fault waveform recording and high-precision time synchronization. With industrial wide-temperature protection and full-loop self-diagnosis design, it features strong anti-electromagnetic interference capability and long-term operational stability, widely used for aging equipment replacement, intelligent upgrading and capacity expansion of distribution protection systems.
II. Hardware Structure and Composition
1. Dual-core Redundant Operation Unit
Equipped with dual 32-bit industrial processors (MPC5125 for sampling and logic operation, MPC8358 for advanced communication processing), the dual-core independent collaborative operation avoids protection refusal and misoperation caused by single-point operation failure, ensuring high accuracy and reliability of relay protection actions.
2. High-precision Sampling and Signal Conditioning Unit
Built-in high-precision transformer signal conditioning circuit collects three-phase voltage, three-phase current, zero-sequence voltage and current signals with 0.2-level sampling accuracy. Multi-stage filtering and anti-interference design eliminate high-frequency harmonic interference, support full-time waveform capture and transient fault recording, providing original data for fault analysis.
3. Digital Input and Trip Output Unit
Integrated with multiple isolated digital input channels and programmable relay trip output contacts, it collects circuit breaker status and field switching signals, and supports customized logic configuration for tripping, reclosing, alarm and interlock control, matching various medium and low-voltage feeder switchgear.
4. Multi-protocol Redundant Communication Unit
Equipped with Gigabit Ethernet and isolated RS485 interfaces, it supports IEC 61850 MMS/GOOSE, Modbus TCP/RTU, DNP3 and IEEE1588 time synchronization. Dual-network redundant networking realizes stable four-remote (telemetry, telesignal, remote control, remote regulation) data interaction with substation integrated automation and SCADA systems, supporting remote parameter setting and fault query.
5. HMI and Status Indication Unit
Configured with high-definition LCD display and customized function keys for on-site viewing of electrical parameters, switch status, fault alarms and historical events. Panel LED indicators clearly display power operation, device fault, protection action and communication status, enabling rapid on-site troubleshooting and commissioning.
6. Industrial Power Supply and Full-protection Unit
Wide-range AC/DC universal power supply (110～230VAC / 110～250VDC) with built-in multi-level protections against overvoltage, undervoltage, surge and reverse connection. Metal shielding shell and three-proof coated PCB ensure excellent vibration, moisture and electromagnetic interference resistance for long-term stable operation in substation and distribution cabinet environments.
III. Technical Specifications
(1) Electrical Parameters
1. Power Supply: 110～230VAC / 110～250VDC wide-range universal input
2. Architecture: Dual 32-bit industrial CPU, separate sampling and communication operation
3. Sampling Accuracy: 0.2-level measurement, 0.5-level protection precision
4. Response Performance: Millisecond-level fault discrimination and trip output
5. Communication Interfaces: Gigabit Ethernet, isolated RS485, dual-network redundancy
6. Supported Protocols: IEC 61850, Modbus TCP/RTU, DNP3, IEEE1588
7. Storage Capacity: Massive local storage for event records, fault waveforms and setting logs
(2) Protection Functions
1. Phase Protection: Definite/inverse time overcurrent protection, instantaneous overcurrent, overload alarm
2. Ground Protection: Zero-sequence overcurrent, ground fault protection, low-current ground fault detection
3. Voltage Protection: Overvoltage, undervoltage, voltage loss, low-voltage blocking protection
4. Intelligent Control: Adaptive auto-reclosing, cold load pickup, fault locking, local/remote control
5. Auxiliary Functions: Frequency anomaly protection, power factor monitoring, energy consumption statistics
(3) Environmental Parameters
Operating Temperature: -40℃～+85℃; Storage Temperature: -50℃～+90℃
Relative Humidity: 5%～95%RH, non-condensing, free of corrosive gas and conductive dust
EMC Compliance: IEC 60255 highest-level anti-interference standard for power protection equipment
Ingress Protection: IP20, for indoor panel cabinet installation
(4) Mechanical Parameters
Mounting Mode: Standard embedded panel mounting
Cooling Mode: Fanless passive natural cooling, maintenance-free design
Structural Features: Metal shielding, three-proof coating, anti-vibration and anti-loose structure
Applicable Equipment: Medium/low-voltage feeder cabinet, tie cabinet, section cabinet
IV. Core Product Functions and Features
1. Full-range Feeder Protection with Accurate Fault Discrimination
Covering all common distribution faults such as phase short circuit, ground fault, overload and voltage abnormality, it supports customizable inverse/definite time setting. The dual-CPU verification algorithm eliminates protection misoperation and refusal caused by sampling interference, rapidly removes feeder faults and prevents large-scale power outage and equipment burnout accidents.
2. Intelligent Automatic Control Adapts to Unattended Power Distribution
Adaptive auto-reclosing distinguishes transient and permanent faults to realize automatic power recovery and fault locking. It supports remote/local switching control and customized interlock logic, triggering backup switching and alarm linkage for feeder faults, improving the automation level of unattended distribution rooms and substations.
3. Complete Data Recording Supports Accurate Fault Tracing
High-frequency waveform recording, time-sequence event logging and setting change recording fully restore fault electrical waveforms and action sequences. Unified high-precision clock synchronization provides reliable data support for fault analysis, setting optimization and power operation compliance audit.
4. Multi-protocol Redundant Communication Enables Intelligent System Integration
Compatible with traditional serial port and new-generation Ethernet power protocols, it supports IEC 61850 digital networking and GOOSE fast linkage. Dual-network redundant architecture avoids offline and data interruption risks, realizing stable four-remote data interaction with various integrated automation and SCADA systems.
5. Industrial High-reliability Design Reduces O&M Workload
Fanless maintenance-free design eliminates vulnerable parts. Wide-temperature components and three-proof structure adapt to harsh working conditions such as strong electromagnetic interference and temperature/humidity fluctuation. Full-loop self-diagnosis pre-judges hidden faults and ensures long-term 24/7 stable operation of the device.
6. Standardized Configuration Enables Fast Replacement and Renovation
Unified hardware interface, wiring definition and configuration specification support plug-and-play in-situ replacement of old protection devices. Setting import/export and template reuse functions greatly shorten system debugging and renovation downtime, reducing power distribution system upgrading costs.
V. Application Scenarios
1. Protection, measurement and automatic control for 10kV/35kV medium-voltage overhead lines and cable feeders in urban and industrial park distribution networks.
2. Auxiliary power system feeder, section switch and tie switch protection equipment for thermal, gas and hydropower plants.
3. Relay protection, fault monitoring and intelligent operation upgrading for internal distribution systems in petrochemical, metallurgical, mining and large manufacturing enterprises.
4. Intelligent protection terminal deployment for substation integrated automation upgrading and digital substation construction complying with IEC 61850 standards.
5. Replacement and reliability upgrading of aging protection devices with failure and incompatible communication faults in distribution systems.
6. Intelligent feeder protection and remote monitoring for unattended distribution rooms, box substations and outdoor switch stations.
