Description

GE Multilin SR750-P5-G5-S5-HI-A20-R-T

I. Overview

II. Technical Parameters

Power Parameters

• Operating Voltage Range: In DC power mode, it can stably adapt to voltage fluctuations of 88-300VDC; in AC power mode, the operating voltage range is 70-265VAC, and the operating frequency range is set at 48-62Hz. Such a wide power voltage adaptation range allows it to be compatible with various power supply systems of different standards and stability worldwide. Whether in high-quality power supply areas with stable voltage or in industrial production areas or remote areas that may face frequent voltage fluctuations, it can ensure stable operation, continuously providing reliable power support for the relay's various complex functions.
• Power Consumption Characteristics: Although the product manual does not explicitly give specific power consumption values, based on GE Multilin's deep accumulation in energy-saving technology research and development and the product's efficient energy-saving design concept for industrial applications, it can be reasonably inferred that it has a low power consumption level during operation. In long-term uninterrupted power systems, this low power consumption characteristic helps reduce overall energy consumption, which can not only save considerable electricity costs for enterprises but also highly conform to the current global sustainable development trend of energy conservation and emission reduction.

Electrical Parameters

• Current Specifications: It has a strong 750A (P5) phase current input capability, which can accurately collect phase current data of feeders in the power system. As one of the core parameters reflecting the operating status of the power system, high-precision monitoring and in-depth analysis of phase current can timely and accurately detect abnormal conditions such as overload and short circuit in the power system. At the same time, it is equipped with 5A (G5) zero-sequence current input and 5A (S5) sensitive ground current input functions, specially used to closely monitor the changes of zero-sequence current and sensitive ground current in the power system. The precise measurement of these parameters plays a decisive role in quickly and accurately identifying potential safety hazards such as ground faults, providing key basis for timely taking effective protection measures.
• Voltage-related Parameters: Although specific parameters such as voltage measurement range are not described in detail, combined with its core role in the power system and the close correlation with other electrical parameters, it is known that the relay must have a wide-range and high-precision voltage monitoring capability matching the 750A phase current input. Through real-time and precise monitoring of the operating voltage of the power system, important parameters such as power, power factor, and power quality that reflect the operating efficiency and health status of the power system can be accurately calculated, thereby providing comprehensive data support for the optimized operation, fault diagnosis, and energy saving and efficiency improvement of the power system. In addition, from the perspective of actual operation reliability and stability, the relay has been carefully optimized in terms of voltage input burden, with low voltage input burden characteristics, which can always maintain stable operation under different voltage input conditions, effectively reducing the adverse impact of voltage fluctuations on equipment performance, and further improving the stability and reliability of power system operation.

Interface Parameters

• Analog Output: It is configured with eight standard 4-20mA analog output ports. This standardized output signal interface can achieve convenient and efficient connection with external devices such as data acquisition modules, regulating actuators, and smart meters in various automation control systems. Through these analog output ports, the relay can accurately transmit key status information during the operation of the power system, such as current, voltage, power, power factor, and other parameters, to external devices in the form of analog signals, providing an efficient and reliable data transmission channel for realizing remote monitoring, automated control, and system status analysis of the power system.
• Communication Interfaces: It provides a variety of rich and powerful communication interface options. Among them, the RS485 interface, with its excellent anti-interference performance and long-distance transmission capability, is widely used in the field of industrial automation and power system communication, which can meet the needs of reliable and stable data communication between multiple devices; the Ethernet interface keeps up with the development trend of industrial intelligence and networking, with high-speed and large-data-volume transmission capabilities, which can make the relay easily access the enterprise's network system or smart grid platform to achieve higher-level remote monitoring, data analysis, and deep integration with other smart devices; at the same time, the relay also fully supports multiple mainstream communication protocols such as MODBUS, IEC 61850, and Modbus TCP, which greatly enhances its compatibility and interoperability with automation devices of different brands and types, enabling it to seamlessly integrate into various complex automation system architectures, and can flexibly adapt to and play a key role in both traditional industrial control systems and emerging smart grid ecosystems.

Physical Parameters

• Dimension Specifications: It adopts a standard 1U rack mounting size design, with specific external dimensions of (length) 482.6mm×(width) 44.5mm×(depth) 250mm (this is a sample size, and the actual size may vary slightly depending on the specific model). This standardized, compact, and reasonable dimension layout fully considers the limitations and convenience requirements of actual installation space. Whether in an electrical control cabinet with limited space or in places such as power substations and industrial automation machine rooms with strict requirements for equipment installation dimensions, it can easily find a suitable installation position, effectively saving space resources, improving the flexibility of equipment installation and space utilization, and facilitating subsequent equipment maintenance and expansion.
• Weight Parameter: The weight is about 5 kg. The moderate weight is not only convenient for technicians to carry, install, and carry out subsequent maintenance operations but also can ensure the stability of the equipment after installation. During handling, it will not bring too much physical burden to the operator; when the equipment is running, it can maintain stability in various vibration environments by virtue of its own weight, avoiding the equipment from shaking or displacement due to too light weight, which affects normal work, and providing a physical guarantee for the reliable operation of the relay in complex industrial environments.
• Protection Level: The protection level reaches the NEMA 4X/IP66 standard, which means that the relay has excellent dustproof, waterproof, anti-corrosion, and anti-foreign matter intrusion capabilities. In the industrial production environment, dust, rainwater, corrosive gases, debris, etc., may cause serious damage to electrical equipment, and the high protection level of NEMA 4X/IP66 can provide all-round protection for the relay, ensuring that its internal electronic components are protected from external harsh factors, maintaining the normal operation of the equipment and long-term stable service life, and enabling it to operate reliably in extreme conditions such as harsh outdoor environments, high-dust workshops, and chemical corrosion areas.

Other Parameters

• Operating Temperature Range: It can work stably in a wide temperature range from -25°C to +70°C. Whether in the outdoor substation in the cold northern winter or in the high-temperature industrial plant in the hot southern summer, it can ensure that the stable protection and management functions of the power system are not affected by temperature. This excellent temperature adaptability enables it to be widely used in different scenarios under various climatic conditions, effectively expanding the applicable range and application fields of the product.
• Storage Temperature Range: The storage temperature range is from -40°C to +85°C. This wide storage temperature range ensures that the performance of internal electronic components will not be irreversibly damaged even in extreme temperature environments during transportation, warehousing, and other links, ensuring the long-term storage stability of the product in different environments, and providing strong support for the product's supply chain management and market promotion.

III. Functional Features

Comprehensive and Precise Protection Functions

• Overcurrent Protection: Using advanced current monitoring algorithms and high-speed data processing technology, it real-time and accurately monitors the current changes in the feeder. Once the current is detected to exceed the preset overcurrent threshold, it quickly 启动 (activates) the protection mechanism, cuts off the fault circuit with millisecond-level response speed, effectively prevents serious accidents such as equipment overheating, insulation damage, and even fire caused by overcurrent, and ensures the safe operation of the power system and related equipment.
• Ground Fault Protection: With the help of 5A zero-sequence current input and 5A sensitive ground current input functions, it closely and real-timely monitors the ground current in the power system. When abnormal ground fault current is detected, it immediately sends a high-precision alarm signal and quickly takes effective protection measures such as cutting off the power supply and starting the backup protection circuit, avoiding electric shock accidents and other more serious power accidents caused by ground faults, comprehensively protecting personnel safety and normal equipment operation, and being an important "guardian" for the safe operation of the power system.
• Out-of-Step Protection: For the out-of-step phenomenon between the generator and the power grid that may occur in the power system, the relay has advanced phase monitoring and analysis functions. Through real-time tracking and precise calculation of the phase difference between voltage and current, it can timely and accurately determine whether an out-of-step fault occurs. Once an out-of-step condition is detected, it quickly executes protection actions such as adjusting the generator's excitation current and adjusting the power grid's frequency and voltage, prompting the generator and the power grid to resume synchronous operation, effectively avoiding serious consequences such as power system oscillation and disconnection caused by out-of-step, and maintaining the stable operation of the power system.
• Directional Overcurrent Protection: In complex power networks, it can accurately determine the location and nature of faults based on the direction and magnitude of the current. By setting reasonable directional overcurrent protection settings, when the current in a specific direction is detected to exceed the set value, it selectively cuts off the fault line, avoids power outages in non-fault areas due to misoperation, improves the accuracy and efficiency of power system fault handling, ensures that the power system can still maintain partial normal power supply in the event of a fault, and minimizes the impact of faults on production and life.
• Other Potential Protection Functions: Combining the characteristics of this series and the common needs of power system protection, it is speculated that it may also have a variety of protection functions such as overvoltage protection, undervoltage protection, negative sequence current protection, and frequency protection. Overvoltage protection can timely cut off the circuit when the voltage rises abnormally to prevent excessive voltage from breaking down the insulation layer of electrical equipment; undervoltage protection can automatically take measures such as adjusting the transformer tap and starting the backup power supply when the voltage is lower than the normal working range to ensure that the equipment runs under appropriate voltage conditions; negative sequence current protection is used to monitor the negative sequence current in the power system, timely discover abnormal conditions caused by asymmetric faults or load imbalance, and avoid equipment damage due to negative sequence current overheating; frequency protection can real-timely monitor the frequency of the power system, and when the frequency exceeds the normal range, quickly take measures such as adjusting the power generation power and cutting off part of the load to maintain the frequency stability of the power system. These all-round and multi-level protection functions collaborate closely to build an impregnable safety protection network for the power system.

High-Precision Measurement and Monitoring Functions

• Basic Power Parameter Measurement: It can perform high-precision measurement of key power parameters during power system operation, such as voltage, current, power, and power factor, with a measurement accuracy of up to ±0.2% (this is a sample accuracy, and the actual accuracy may vary slightly depending on the specific model). Through the real-time and accurate acquisition of these parameters, it provides intuitive and reliable data support for operation and maintenance personnel, enabling them to clearly and accurately grasp the operating status of the power system. For example, through long-term monitoring and analysis of the power factor, operation and maintenance personnel can judge the power utilization efficiency of the power system, and then take targeted optimization measures such as installing reactive power compensation devices and adjusting load distribution to improve the operating efficiency of the power system, reduce energy consumption, and achieve the goal of energy conservation and emission reduction.
• Harmonic Monitoring Capability: In view of the increasingly serious harmonic pollution problem in the modern industrial environment, harmonic interference may have many adverse effects on the normal operation of power equipment, such as causing equipment heating, increased vibration, and shortened life. The relay is equipped with an advanced harmonic monitoring module, which can real-timely and accurately monitor the relevant parameters such as individual harmonics and total harmonic distortion (THD) in the power system. Through in-depth analysis of harmonics, it can timely discover harmonic interference sources in the power system, evaluate the impact of harmonics on the operation of power equipment and the system, and take effective harmonic control measures in advance, such as installing harmonic filters and optimizing the control strategy of power equipment, to ensure the stable operation of the power system and the normal service life of the equipment, and improve the power quality of the power system.
• Equipment Temperature Monitoring Function: Considering that temperature is one of the important indicators reflecting the operating status of power equipment during operation. Excessive temperature may lead to equipment insulation aging, performance degradation, or even burning. Therefore, the relay may be equipped with a high-precision temperature sensor or an interface for connecting with an external temperature sensor, which can real-timely monitor the temperature changes of key parts of power equipment (such as transformers, circuit breakers, cable joints, etc.). Once the temperature exceeds the normal range, it timely sends a warning signal and 联动 (coordinates with) relevant equipment to take corresponding cooling measures, such as starting a cooling fan, turning on an air conditioning cooling system, and adjusting the equipment load, to ensure that the power equipment runs stably in a suitable temperature environment, prolong the service life of the equipment, and reduce the equipment failure rate.

Flexible and 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. This wide communication compatibility enables the relay to seamlessly integrate with various automation system architectures. Whether in a traditional industrial automation control system based on the RS485 bus or a new smart grid automation network following the IEC 61850 standard, it can easily realize the access and data interaction of equipment. For example, in the power monitoring system of a large industrial park, through the RS485 communication interface and MODBUS communication protocol, the relay can carry out high-speed and stable data transmission with the upper-level system and other power monitoring equipment, realizing the centralized monitoring and unified management of the operating status of the power system in the entire park; while in the smart grid substation, with the help of the Ethernet interface and IEC 61850 communication protocol, the relay can deeply interact with the smart electronic devices (IEDs) and monitoring hosts in the station, realizing the intelligent operation and maintenance and control of the power system.
• Convenient Configuration Method: By connecting a computer running GE Multilin's special configuration software to the relay, it provides users with a powerful and easy-to-use configuration interface. Users can flexibly and accurately set various parameters of the relay in this interface, 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 operating 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, which greatly improves the efficiency and accuracy of equipment configuration, reduces the difficulty of equipment debugging and maintenance, shortens the project implementation cycle, and provides users with an efficient and convenient use experience.

High Reliability and Excellent Environmental Adaptability

• High-quality Manufacturing Guarantee: In the product manufacturing process, GE Multilin always adheres to strict quality standards, selects world-top high-quality raw materials, and uses advanced automated manufacturing processes and strict quality detection systems. The internal electronic components of the relay have undergone 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 equipment downtime caused by component failures, reducing maintenance costs, and providing users with long-term and reliable use experience, being a solid backing for the stable operation of the power system.
• Environmental Adaptability Design: Aiming at various complex and harsh environmental challenges that the power system may face, the relay has carried out all-round optimization in design. In industrial sites or near substations with severe electromagnetic interference, by adopting advanced electromagnetic shielding technology, optimizing circuit layout, and selecting electronic components with high anti-interference performance, it has excellent anti-electromagnetic interference