Description

GE Multilin SR750-P1-G1-S1-HI-A20-G

I. Overview

II. Technical Parameters

Power Parameters

• Control Voltage: It can work stably within the voltage range of 3 - 32V DC. Such a wide control voltage range enables it to flexibly adapt to various control signal sources of different voltage levels, easily connecting with both low-voltage small control systems and high-voltage large industrial automation systems, which greatly enhances the product's versatility and application flexibility.
• Operating Temperature: It can operate normally in extreme temperature environments from -20°C to +85°C. Whether in outdoor substations in cold northern winters or high-temperature industrial plants in hot southern summers, the relay can stably function without being affected by temperature fluctuations, effectively expanding its applicable geographical areas and working scenarios.

Electrical Parameters

• Load Current: It supports a load current of 20A to 60A. The strong load capacity allows it to easily handle the driving and control tasks of various high-power devices, meeting the diverse needs of different industrial equipment and power systems for current carrying capacity.
• Load Voltage: The load voltage range covers 24V to 220V, including common voltage specifications such as 24V, 48V, 110V, and 220V, enabling seamless connection with various load devices of different voltage levels and providing strong support for a wide range of application scenarios.

Communication Parameters

• It is equipped with three standard serial communication ports. One RS232 port is located on the front panel for convenient local computer access, used for on-site debugging and parameter setting of equipment. Two RS485/RS422 ports are set at the rear of the relay, mainly for remote communication, which can stably connect with Distributed Control Systems (DCS), Supervisory Control and Data Acquisition (SCADA) systems, or Programmable Logic Controllers (PLC) to achieve remote monitoring and management of equipment. The baud rate of all serial ports can be flexibly adjusted between 300 and 19,200 bps to adapt to application scenarios with different communication rate requirements.
• An optional Ethernet port at the rear supports connecting the relay to a 10 mbps Ethernet network. With the high-speed data transmission characteristics of Ethernet, it can achieve efficient connection between equipment and enterprise network systems or smart grid platforms, facilitating higher-level remote monitoring, data analysis, and deep integration with other intelligent devices. Meanwhile, the relay supports multiple mainstream communication protocols such as Modbus® RTU, DNP 3.0 level 2, and Modbus RTU TCP/IP, enabling good compatibility and interoperability with automation devices of different brands and types, and easily integrating into various complex automation system architectures.

III. Functional Features

Comprehensive and Precise Protection Functions

• Overcurrent Protection: Using advanced current monitoring algorithms, it tracks load current changes in real time and accurately. Once the current is detected to exceed the preset overcurrent threshold, it can quickly activate the protection mechanism with millisecond-level response speed, timely cut off the circuit, and effectively prevent serious accidents such as equipment overheating, insulation damage, and even fire caused by overcurrent, fully ensuring the safe and stable operation of the power system and related equipment.
• Ground Fault Protection: With sensitive ground current monitoring function, it closely monitors the ground current in the power system. When abnormal ground fault current is detected, it immediately issues a high-precision alarm signal and quickly takes effective measures such as cutting off the power supply and starting the backup protection circuit, avoiding personal electric shock hazards and other more serious power accidents caused by ground faults, and building a solid defense line for personnel safety and normal equipment operation.
• Short Circuit Protection: It has high-speed short circuit detection capability, can identify short circuit faults instantly, and quickly execute circuit breaking operations to prevent irreversible damage to equipment and lines caused by short circuit current, ensuring that the power system can quickly return to normal operation when a short circuit fault occurs.

Efficient Control Functions

• Solid State Control: Adopting advanced solid-state switching technology and abandoning traditional mechanical contacts, it greatly improves the reliability and service life of the relay. In application scenarios with frequent switching actions, problems such as mechanical contact wear and adhesion will not occur, effectively reducing equipment maintenance frequency and costs and ensuring long-term stable system operation.
• Fast Response: With an extremely short response time, it can complete the switching action in microsecond level, especially suitable for occasions with strict requirements on switching speed, such as start-stop control of high-speed rotating equipment and transmission of high-frequency pulse signals, ensuring the timely and accurate execution of control commands and improving the overall operation efficiency of the system.

Convenient Communication and Configuration Functions

• Support for Multiple Communication Protocols: It supports multiple mainstream communication protocols such as Modbus, IEC 61850, RS485, and Modbus TCP, with wide communication compatibility, and can seamlessly integrate with various automation system architectures. Whether in traditional industrial automation control systems based on RS485 bus or emerging smart grid automation networks following IEC 61850 standard, it can easily realize equipment access and data interaction, providing strong support for building intelligent and efficient power and industrial automation management systems.
• Convenient Configuration Method: By connecting a computer running GE Multilin's special configuration software to the relay, users can obtain a powerful and easy-to-use configuration interface. In this interface, users can flexibly and accurately set various parameters of the relay, including the action threshold and time delay of protection functions, the baud rate and communication address of communication parameters, and the range and accuracy of measurement parameters. At the same time, the relay is also equipped with a complete simulation test function. Users can simulate various power system fault conditions and normal operation states on the computer to comprehensively and carefully test the operation of the relay. Through simulation testing, users can discover potential problems in advance and optimize and adjust the parameters of the relay, significantly improving the efficiency and accuracy of equipment configuration, reducing the difficulty of equipment debugging and maintenance, greatly shortening the project implementation cycle, and bringing users an efficient and convenient use experience.

High Reliability and Excellent Environmental Adaptability

• High-quality Manufacturing Guarantee: In the product manufacturing process, GE Multilin strictly follows high-standard quality systems, selects top global high-quality raw materials, and uses advanced automated manufacturing processes and strict quality detection procedures. The internal electronic components of the relay have gone through layer-by-layer screening and multiple rounds of strict testing to ensure that each component has excellent performance and extremely high reliability. In the long-term and high-intensity operation process, these high-quality components can work stably, effectively reducing the probability of equipment downtime caused by component failures, reducing maintenance costs, and providing users with long-term and reliable use guarantees, serving as a solid backing for the stable operation of power systems and industrial automation.
• Environmental Adaptability Design: Aiming at various complex and harsh environmental challenges that power systems and industrial automation may face, the relay has been comprehensively optimized in design. In industrial sites with strong electromagnetic interference or near substations, it has excellent electromagnetic interference resistance by adopting advanced electromagnetic shielding technology, optimizing circuit layout, and selecting electronic components with high anti-interference performance, and can work stably in complex electromagnetic environments without being affected by external electromagnetic interference. In some chemical enterprises, coastal areas and other places with chemical corrosion risks, its shell and internal structure adopt materials with excellent corrosion resistance or special protective coatings to ensure that the relay can still operate normally in harsh chemical environments and effectively extend the service life of the equipment. In terms of temperature and humidity adaptability, the relay can work stably in a wide temperature range from -20°C to +85°C and an environment with up to 95% relative humidity (non-condensing). Whether in power facilities in cold polar regions or power grid systems in high-temperature and humid tropical regions, it can reliably play its protection and control functions, demonstrating excellent environmental adaptability.