The MIFIIPA55E20HI00 is a mid-to-high end digital feeder protection relay, focusing on primary and backup protection for feeders in distribution systems, while offering comprehensive monitoring and control functions. It is a cost-effective solution developed by GE for medium and low-voltage distribution networks.
With a core positioning of Precise Protection, Easy Operation & Maintenance, and Flexible Adaptation, it satisfies the core requirements of conventional feeder protection. Meanwhile, through flexible configuration and rich communication capabilities, it adapts to distribution systems of various scales and scenarios, balancing practicality and intelligence, helping users achieve refined management of distribution networks.The MIFIIPA55E20HI00 features four core functions: protection, monitoring, control, and communication, covering the entire operation process of distribution feeders. Its functional design aligns with actual operation and maintenance needs, balancing professionalism and ease of use.
Protection Functions
The relay provides comprehensive feeder protection, enabling accurate detection and rapid response to various line faults, minimizing fault propagation, and safeguarding lines and equipment. Its core protection functions include:
- Phase Overcurrent Protection (50P1/50P2, 51P)Including instantaneous phase overcurrent protection (50P1/50P2) and time-delayed phase overcurrent protection (51P). Different operating thresholds and time delays can be set according to site requirements to adapt to feeders of various ratings, effectively addressing overloads, short circuits, and other faults.
- Earth Fault Overcurrent Protection (50G1/50G2, 51G)Including instantaneous earth fault overcurrent protection (50G1/50G2) and time-delayed earth fault overcurrent protection (51G). It accurately detects line earth faults, prevents equipment damage or personal safety hazards caused by earth faults, and is compatible with various earthing systems.
- Thermal Overload Protection (49)Equipped with thermal overload protection, it monitors temperature-related operating parameters in real time to prevent overheating damage due to prolonged overload and extend equipment service life.
- Optional Extended Protection FunctionsDepending on configuration, it supports cold load pickup protection, trip failure protection, I²t counters, and other functions (available only on selected models), further enhancing protection coverage for complex applications.
Monitoring and Metering Functions
The product features complete real-time monitoring and metering capabilities, comprehensively collecting operating parameters of distribution feeders to provide accurate data analysis for operation and maintenance personnel. Core functions include:
- Electrical Parameter MeteringAccurately measures three-phase current, voltage, power, energy, and other key electrical parameters with high metering accuracy, meeting daily O&M metering requirements without additional metering devices.
- Fault Recording and Waveform CaptureProvides event recording and fault waveform logging, storing multiple sets of fault event data and analog/digital waveforms. This facilitates fault cause analysis and fault type identification, strongly supporting troubleshooting.
- Status Monitoring and Self-DiagnosisFeatures self-diagnosis to monitor its own operating status in real time, promptly detecting device faults (e.g., power abnormalities, communication failures) and indicating them via LEDs or communication signals. It also supports circuit breaker maintenance monitoring through I²t counters to record equipment wear.
- Multiple Parameter GroupsSupports configuration of multiple protection parameter sets, allowing flexible switching according to changing on-site operating conditions to suit various application scenarios.
Control Functions
The MIFIIPA55E20HI00 provides flexible control for local and remote operation of feeders and associated equipment, improving operational efficiency. Core control functions include:
- Local ControlVia the built-in LCD display and keypad, users can set protection parameters, query faults, and perform manual closing/opening operations conveniently without additional control equipment.
- Remote ControlSupports remote switching, parameter modification, and status query through communication interfaces, enabling remote O&M and reducing on-site workload.
- Logic ControlOffers flexible logic programming to configure control logic as required, realizing interlock and coordinated control with other devices and enhancing the automation level of the distribution system.
Communication Functions
To meet the requirements of intelligent distribution systems, the relay is equipped with abundant communication interfaces and protocols for seamless integration with monitoring systems. Core communication functions include:
- Communication InterfacesStandard RS232 and RS485 interfaces; Ethernet is available on selected configurations, supporting flexible communication topologies.
- Communication ProtocolsSupports mainstream protocols including Modbus RTU and Modbus TCP/IP, enabling integration with GE Enervista MII Setup software and third-party monitoring systems for data uploading and remote control.
- Data TransmissionUploads real-time operating parameters, fault information, and status data. It supports firmware upgrade for convenient later maintenance and function enhancement.
Technical Parameters
- Current Input: Phase CT rated at 5A (measuring range 0.5–12A), earth CT rated at 5A (measuring range 0.5–12A), suitable for current measurement in conventional power distribution systems.
- Power Supply: Supports AC 110–230V and DC 110–250V, adaptable to various power supply scenarios with high stability and tolerance to voltage fluctuations.
- Output Contacts: Equipped with multiple programmable output contacts for tripping, alarm, control and other functions; contact capacity meets industrial on-site requirements.
- Measuring Accuracy: High accuracy for current and voltage measurement, with errors controlled within allowable limits to meet precision requirements for metering and protection.
Environmental Parameters
- Operating Temperature: -40°C to +70°C, suitable for harsh high and low temperature environments and stable operation in various industrial scenarios.
- Relative Humidity: 5%–95% (non-condensing), adaptable to humid environments without performance degradation caused by humidity.
- Protection Degree: IP20, suitable for panel mounting, effectively preventing dust and foreign objects from entering the device and ensuring safe operation.
Mechanical & General Parameters
- Dimensions: Approximately 100mm × 80mm × 20mm, compact size to save panel installation space.
- Mounting: Panel mounting, easy to install and compatible with standard power distribution panels.
- Weight: Approximately 5 lbs (≈2.27kg), lightweight for convenient installation and handling.
- Warranty: 1-year warranty to ensure long-term stable operation.
- User Interface: English LCD display with keypad, intuitive operation for on-site operation and maintenance personnel.
- Anti-Interference Performance: Strong electromagnetic anti-interference capability, compliant with electromagnetic environment requirements in industrial sites to avoid malfunctions caused by interference.
Product Advantages
- High Reliability: Adopts mature GE relay protection technology and high-quality components. After strict production testing and certification, the device features stable operation and low failure rate. It can adapt to harsh industrial environments and ensure the continuous and safe operation of the power distribution system.
- Full-Featured: Integrates protection, monitoring, control and communication in one unit. It realizes the full-process feeder management without additional equipment, reducing users’ capital investment in devices.
- Flexible Adaptation: Supports multiple groups of parameter settings, various communication protocols and interfaces. It can adapt to power distribution systems of different scales and types, and supports function expansion to meet users’ diversified requirements.
- Easy Operation & Maintenance: Equipped with an intuitive user interface, complete fault recording and self-diagnosis functions. It enables O&M personnel to quickly troubleshoot and modify parameters, reducing workload and difficulty.
- Cost-Effective: As an economical high-performance relay, it effectively controls costs while ensuring core performance. It provides users with a cost-effective feeder protection solution that balances practicality and economy.
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GENERAL ELECTRIC 531X305NTBAJG1 RBLT BOARD
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