Description
GE Multilin UR8LH
I. Overview
GE Multilin UR8LH is an important member of the GE Multilin UR series of universal relays. It is specially designed for the protection, monitoring, and control of various equipment in power systems. As a high-performance industrial-grade relay, it integrates GE's advanced technologies in the field of power automation, featuring powerful protection functions, precise measurement capabilities, and flexible communication performance. It can provide reliable protection for power equipment such as transformers, motors, and generators, and is widely used in power transmission, distribution, and industrial power systems, meeting the high requirements for the safe operation of equipment in complex power environments.
GE Multilin UR8LH is an important member of the GE Multilin UR series of universal relays. It is specially designed for the protection, monitoring, and control of various equipment in power systems. As a high-performance industrial-grade relay, it integrates GE's advanced technologies in the field of power automation, featuring powerful protection functions, precise measurement capabilities, and flexible communication performance. It can provide reliable protection for power equipment such as transformers, motors, and generators, and is widely used in power transmission, distribution, and industrial power systems, meeting the high requirements for the safe operation of equipment in complex power environments.
II. Functional Features
Diversified Protection Functions: UR8LH is equipped with a wide range of protection functions, which can provide comprehensive protection against various types of faults that different power equipment may encounter. Whether it is common electrical faults such as overcurrent, overvoltage, undervoltage, overfrequency, and underfrequency, or special faults such as zero-sequence current, ground fault, and differential protection, it can quickly detect and respond through built-in advanced algorithms. When a fault occurs, it can promptly issue trip commands or alarm signals, effectively curbing the spread of faults and minimizing losses caused by equipment damage and power outages. Moreover, its protection parameters can be flexibly set according to the characteristics and operating requirements of different equipment, adapting to diverse application scenarios.
Diversified Protection Functions: UR8LH is equipped with a wide range of protection functions, which can provide comprehensive protection against various types of faults that different power equipment may encounter. Whether it is common electrical faults such as overcurrent, overvoltage, undervoltage, overfrequency, and underfrequency, or special faults such as zero-sequence current, ground fault, and differential protection, it can quickly detect and respond through built-in advanced algorithms. When a fault occurs, it can promptly issue trip commands or alarm signals, effectively curbing the spread of faults and minimizing losses caused by equipment damage and power outages. Moreover, its protection parameters can be flexibly set according to the characteristics and operating requirements of different equipment, adapting to diverse application scenarios.
High-Precision Measurement and Data Recording: It has high-precision measurement capabilities, which can collect key electrical parameters in the power system in real-time and accurately, including current, voltage, active power, reactive power, power factor, frequency, and power consumption. These measured data not only provide an accurate basis for the judgment of protection functions but also can track the operating status of equipment for a long time through the data recording function. Operation and maintenance personnel can use these data to conduct in-depth analysis of equipment operating trends, evaluate system performance, and provide strong data support for equipment maintenance and the optimal operation of power systems.
Flexible Communication and System Integration: It supports a variety of mainstream industrial communication protocols, such as Modbus, DNP3.0, IEC 61850, etc., and can achieve seamless data interaction with SCADA systems, human-machine interfaces (HMI), PLCs, and other equipment. Through the communication interface, operations such as remote monitoring of equipment operating status, modification of protection parameters, and upload of fault information can be realized, facilitating the construction of a centralized power monitoring and management system, and improving the automated management level and operation and maintenance efficiency of power systems. At the same time, its modular design makes integration with other equipment more convenient, and functions can be expanded according to actual needs, enhancing the adaptability of the system.
Intelligent Self-Inspection and Diagnosis: It has a built-in perfect self-inspection and diagnosis mechanism, which can monitor the hardware status of the relay itself, software operation, and external connection circuits in real-time. Once an abnormality is found, such as power failure, communication interruption, sensor abnormality, etc., it will immediately issue an alarm through indicator light flashing or communication signals, and record fault information in detail, including the time and type of fault occurrence, helping operation and maintenance personnel quickly locate and handle problems, shorten fault troubleshooting time, and improve the reliability and availability of the system. In addition, it is equipped with a user-friendly human-machine interface, through the LCD display and operation buttons, facilitating on-site personnel to perform parameter configuration, status query, and other operations, with simple and intuitive operation.
III. Technical Parameters
Electrical Parameters
Power Input: Supports a wide range of AC and DC power inputs, usually 110-240V AC/DC, which can adapt to power supply conditions in different regions and scenarios, and can maintain stable operation when the power supply voltage fluctuates to a certain extent.
Rated Current: The rated current of the measurement and protection circuit is generally 5A or 1A, which can be flexibly configured through external current transformers (CT) to meet the current monitoring needs of different power equipment.
Rated Voltage: The rated voltage of the voltage circuit is usually 100V (line voltage or phase voltage, specifically determined according to the system wiring mode), adapting to the voltage signal transformed by the voltage transformer (PT) in the high-voltage system.
Measurement Accuracy: The measurement accuracy of current and voltage can reach 0.2 class, and the measurement accuracy of power can reach 0.5 class, ensuring the accuracy and reliability of measurement data, and providing a solid foundation for protection and monitoring functions.
Electrical Parameters
Power Input: Supports a wide range of AC and DC power inputs, usually 110-240V AC/DC, which can adapt to power supply conditions in different regions and scenarios, and can maintain stable operation when the power supply voltage fluctuates to a certain extent.
Rated Current: The rated current of the measurement and protection circuit is generally 5A or 1A, which can be flexibly configured through external current transformers (CT) to meet the current monitoring needs of different power equipment.
Rated Voltage: The rated voltage of the voltage circuit is usually 100V (line voltage or phase voltage, specifically determined according to the system wiring mode), adapting to the voltage signal transformed by the voltage transformer (PT) in the high-voltage system.
Measurement Accuracy: The measurement accuracy of current and voltage can reach 0.2 class, and the measurement accuracy of power can reach 0.5 class, ensuring the accuracy and reliability of measurement data, and providing a solid foundation for protection and monitoring functions.
Physical Parameters
Dimensions: Adopting a compact structural design, the overall dimensions conform to the standard DIN rail mounting specifications, for example, width × height × depth is approximately 140mm×180mm×125mm (specific dimensions are subject to the actual product), which is convenient for installation and layout in the control cabinet, saving installation space.
Weight: It is relatively light, usually around 1kg, facilitating transportation, installation, and maintenance operations, and reducing labor costs.
Dimensions: Adopting a compact structural design, the overall dimensions conform to the standard DIN rail mounting specifications, for example, width × height × depth is approximately 140mm×180mm×125mm (specific dimensions are subject to the actual product), which is convenient for installation and layout in the control cabinet, saving installation space.
Weight: It is relatively light, usually around 1kg, facilitating transportation, installation, and maintenance operations, and reducing labor costs.
Environmental Parameters
Operating Temperature: The operating temperature range is generally -25℃ to +70℃, which can work stably in harsh industrial environments such as high and low temperatures, and is suitable for various scenarios such as outdoor equipment in cold regions and high-temperature workshops.
Storage Temperature: The storage temperature range is -40℃ to +85℃, which can withstand large temperature changes during equipment transportation and storage, ensuring that equipment performance is not affected.
Humidity: It can operate normally in an environment with a relative humidity of 5%-95% (non-condensing), has good moisture resistance, and is suitable for environments such as humid industrial workshops and outdoor distribution rooms.
Protection Level: The shell protection level is usually IP20, which is suitable for installation inside the control cabinet, can effectively block the entry of dust and foreign objects, protect internal circuit components, and ensure the long-term stable operation of the equipment.
Operating Temperature: The operating temperature range is generally -25℃ to +70℃, which can work stably in harsh industrial environments such as high and low temperatures, and is suitable for various scenarios such as outdoor equipment in cold regions and high-temperature workshops.
Storage Temperature: The storage temperature range is -40℃ to +85℃, which can withstand large temperature changes during equipment transportation and storage, ensuring that equipment performance is not affected.
Humidity: It can operate normally in an environment with a relative humidity of 5%-95% (non-condensing), has good moisture resistance, and is suitable for environments such as humid industrial workshops and outdoor distribution rooms.
Protection Level: The shell protection level is usually IP20, which is suitable for installation inside the control cabinet, can effectively block the entry of dust and foreign objects, protect internal circuit components, and ensure the long-term stable operation of the equipment.
IV. Application Fields
Transformer Protection: In the protection of transformers in power systems, UR8LH can monitor parameters such as current, voltage, and temperature on the high and low voltage sides of the transformer in real-time, and realize protection against faults such as overload, short circuit, grounding, and gas in the transformer. When the transformer is abnormal, it quickly acts to cut off the power supply, prevent the fault from expanding, protect the safe operation of the transformer, and extend its service life.
Transformer Protection: In the protection of transformers in power systems, UR8LH can monitor parameters such as current, voltage, and temperature on the high and low voltage sides of the transformer in real-time, and realize protection against faults such as overload, short circuit, grounding, and gas in the transformer. When the transformer is abnormal, it quickly acts to cut off the power supply, prevent the fault from expanding, protect the safe operation of the transformer, and extend its service life.
Motor Protection: For large motors in industrial enterprises, UR8LH can provide comprehensive protection functions. By monitoring parameters such as the operating current, temperature, and speed of the motor, it can protect against faults such as overload, locked rotor, phase loss, and grounding of the motor. When a motor fault occurs, it timely cuts off the power supply to avoid motor damage due to the fault, ensures the continuity of production, and reduces production losses caused by equipment faults.
Power Distribution System: In equipment such as switch cabinets and distribution lines in the power distribution system, UR8LH can play an important role. It can monitor parameters such as current, voltage, and power of the distribution line, provide rapid protection against faults such as overcurrent, overvoltage, and short circuit of the line, ensure the stable operation of the power distribution system, improve the reliability of power supply, and provide stable power protection for industrial production and residents' lives.
New Energy Power Generation Systems: In new energy power generation systems such as wind power generation and solar power generation, UR8LH can be used to protect key equipment such as generators and inverters. By monitoring the operating parameters of the equipment, it can timely detect and handle faults, ensure the safe and efficient operation of new energy power generation systems, and promote the effective utilization of new energy.
