Description
1. Overview
GE 350-E-P1-G1-H-E-E-N-P-SN-D is a high-performance intelligent feeder protection, control and measurement relay belonging to the GE Vernova Multilin 350 Series. It is an integrated intelligent power device serving medium and low-voltage distribution systems for protection, control, metering and communication.
This high-end customized version integrates complete standard protection logic, enhanced HMI display, high-speed Ethernet communication, wide-range AC/DC power supply and high-precision electrical measurement. It is designed for industrial substations, auxiliary power distribution, building power distribution, renewable energy grid connection points and municipal power supply systems.
The relay continuously monitors full-scale electrical parameters including grid voltage, current, frequency, power and energy. It provides fast tripping and alarm functions for line faults such as overload, short circuit, ground fault, overvoltage, undervoltage, overfrequency and underfrequency. It also supports circuit breaker control, status monitoring, disturbance recording, event logging and predictive diagnostics.
Designed in compliance with international power standards, it features strong anti-interference capability, high operational stability and flexible configuration. It suits conventional distribution networks, harsh operating conditions and unattended substations. Widely applied in new power distribution projects, retrofitting & replacement of legacy protection relays and intelligent upgrading of distribution systems to guarantee safe, stable and compliant operation of distribution networks.
1. Comprehensive Feeder Protection with Accurate & Fast Fault Response
Equipped with GE standard full-set P1 protection algorithms, it integrates phase overcurrent, ground overcurrent, definite/inverse time protection, instantaneous overcurrent, overvoltage/undervoltage, overfrequency/underfrequency and undervoltage protection. It covers all typical electrical faults of medium/low voltage feeders.
It delivers high-precision fault discrimination and accurate operating delays, enabling rapid isolation of faulty feeders to avoid busbar voltage loss, equipment burnout and large-scale power outages caused by fault propagation. It fully satisfies coordination requirements for relay protection in industrial and municipal distribution systems.
2. Enhanced Human-Machine Interface for Convenient Commissioning & Maintenance
Fitted with Class E enhanced backlit graphical LCD and customized keypad, supporting multi-language interfaces (Chinese / English). It visualizes all electrical measurements, equipment status, fault information and setting parameters in real time.
It supports on-site setting configuration, protection function enable/disable, breaker open/close control and fault inquiry. The intuitive interface simplifies field commissioning, routine inspection and troubleshooting, facilitating rapid on-site maintenance.
3. Universal Wide-Range Power Supply with Excellent Environmental Adaptability
Adopting H-type wide-voltage high-power power supply architecture, it accepts 85–265 VAC and 88–300 VDC universal power input. It is perfectly compatible with substation DC panels, UPS power supply and industrial mains.
With broad voltage tolerance, it withstands grid voltage fluctuation, momentary voltage dip and power supply noise. It runs continuously and stably without crash or unwanted operation during system startup/shutdown, load variation and grid disturbance.
4. High-Speed Ethernet Communication for Intelligent Distribution Networking
Dual-Ethernet configuration with two 10/100 Base-TX high-speed Ethernet ports. Supporting mainstream power communication protocols, it seamlessly connects to substation integrated automation systems, SCADA platforms and power IoT systems.
It enables real-time remote measurement, remote signalling, remote control, remote setting modification, fault data upload and disturbance record transmission. It supports unattended operation, remote monitoring and intelligent maintenance for distribution networks and meets digital upgrading demands of smart grids.
5. High-Precision Measurement & Fault Diagnostics Ensuring Data Reliability
Built-in high-precision data acquisition unit accurately measures three-phase current, three-phase voltage, active/reactive power, power factor, accumulated energy and frequency up to advanced industrial metering standards.
It provides sequence of events recording, disturbance recording, waveform analysis and self-diagnosis. Complete fault playback offers reliable data support for fault analysis, setting optimization and system retrofitting.
6. Industrial Reinforced Construction for Stable Long-Term Maintenance-Free Operation
The unit adopts industrial dust-proof and anti-interference design and passes rigorous EMC testing to resist strong electromagnetic radiation, switching surges and harmonic interference in substations.
Robust hardware with industrial wide-temperature components provides outstanding vibration resistance, humidity resistance and anti-aging performance. It supports 24/7 continuous operation with minimal routine maintenance, low failure rate and long service life, suitable for industrial plants, outdoor substations and high-humidity workshops.
3. Technical Specifications
1. Basic Parameters
Model: 350-E-P1-G1-H-E-E-N-P-SN-D
Brand: GE VERNVOA
Product Series: Multilin 350 Intelligent Feeder Protection Relay
Device Type: Integrated protection, measurement and communication IED for distribution systems
Core Functions: Feeder fault protection, electrical metering, circuit breaker control, event recording, disturbance recording, remote communication & monitoring
Typical Applications: Industrial substations, auxiliary power distribution systems, municipal medium/low voltage distribution networks, renewable energy box transformers, intelligent building power distribution
2. Protection Function Specifications
Overcurrent Protection: Definite time / inverse time phase overcurrent, ground overcurrent, residual overcurrent protection
Instantaneous Protection: Instantaneous and delayed instantaneous overcurrent
Voltage Protection: Overvoltage, undervoltage, loss-of-voltage, voltage unbalance protection
Frequency Protection: Overfrequency, underfrequency, frequency abnormality blocking
Auxiliary Functions: Breaker failure detection, protection blocking, fault alarm, self-diagnosis
Operating Characteristics: Continuously adjustable protection settings, precise operating delays, complete logic to prevent unwanted operation and failure to trip
3. Electrical & Measurement Specifications
Power Supply: 85–265 VAC, 88–300 VDC universal AC/DC
Measurement Accuracy: Voltage / Current ±1% FS; high-precision sampling for power and energy
Communication Interfaces: Dual 10/100 Mbps Ethernet ports
Sampling Method: Full-cycle high-speed synchronous sampling
Data Storage: Large-capacity storage for event logs and disturbance records for long-term fault data retention
Control Output: Programmable digital inputs and outputs supporting breaker closing and tripping control
4. Environmental & Mechanical Specifications
Operating Temperature: -40℃～+85℃
Storage & Transportation Temperature: -50℃～+90℃
Operating Humidity: 5%～95% RH, non-condensing, no corrosive gas
EMC Compliance: IEC industrial EMC standard with high immunity to electromagnetic interference
Mounting: Standard cabinet flush mounting
Front Protection: High dust resistance for indoor switchgear environment
Operation Mode: Continuous non-stop operation, frequent fault switching, unattended maintenance
GE 350-E-P1-G1-H-E-E-N-P-SN-D feeder protection relay operates under a closed-loop workflow: Real-Time Sampling & Monitoring → Logical Calculation & Discrimination → Protection Action Output → Data Storage & Upload.
After power-on, the high-precision sampling unit continuously synchronously acquires raw electrical data including three-phase currents, three-phase voltages and frequency from distribution feeders. After filtering, shaping and computation, derived parameters such as power, energy and unbalance factor are calculated in real time.
Embedded standardized protection algorithms continuously compare live operating parameters against preset protection settings. When faults including overload, short circuit, ground fault, abnormal voltage or frequency occur, the relay executes rapid fault identification and delay verification. It outputs trip or alarm signals to open the circuit breaker and isolate the faulty circuit. Meanwhile, fault data, timestamp and fault type are captured and stored.
Under normal operating conditions, the device continuously transmits real-time electrical measurements, switch status and equipment operation data to the supervisory system and performs continuous self-check to detect potential anomalies, ensuring safe operation and visualized management of the whole distribution system.
1. Feeder Protection for Industrial Auxiliary Substations
Widely deployed in high-voltage and low-voltage switchgear for factory feeder protection and monitoring. It provides comprehensive fault protection for production feeders and motor loads to avoid production shutdown caused by circuit faults and guarantee continuous power supply for industrial processes.
2. Municipal & Commercial Intelligent Distribution Systems
Suitable for municipal distribution networks, large commercial complexes, office buildings and data centers. It realizes intelligent feeder protection, precision metering and remote monitoring, satisfying digitalization and unattended operation requirements of smart grids and improving automation and reliability of power supply.
3. Renewable Energy Box Transformer & Grid Connection Systems
Applied for feeder protection on HV/LV side of solar and wind box transformers. Adapting to intermittent and fluctuating power generation characteristics of renewables, it accurately identifies grid connection faults and voltage/frequency anomalies to ensure safe grid integration and stable distribution network operation.
4. Retrofit & Replacement of Legacy Protection Equipment
Direct replacement for outdated electromechanical relays and conventional microprocessor-based protection devices. Featuring comprehensive functions, flexible configuration and strong communication compatibility, it requires minimal modification to cabinet wiring. It enables low-cost protection upgrade and digital transformation and resolves drawbacks of legacy relays such as low accuracy, limited functions and lack of remote maintenance capability.
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