Trafag Highlights the 879x Hybrid Gas Density Monitor for Advanced Power Grid Gas Monitoring

­Trafag, a leading manufacturer of high-accuracy measurement devices, highlights its 879x Hybrid Gas Density Monitor RS485/MODBUS, combining self-acting monitoring and continuous density measurement of insulating gases in one device. By directly measuring gas density in high-voltage systems, this innovative monitor is the most reliable solution on the market for the utilities industry.

The 879x Hybrid Gas Density Monitor utilizes a hybrid measurement principle, combining gas density reference chamber and oscillating quartz sensing element technologies for direct and accurate gas density measurement in power grid applications. The monitor is fully temperature compensated, providing exact switching output at all operating temperatures, ensuring accurate readings and reliable performance regardless of temperature fluctuations in substations and transmission systems. Its wide ambient temperature range of −40℃ to +80℃ ensures accurate and dependable performance in extreme conditions, making it suitable for deployment in both indoor and outdoor utility environments.

This device provides continuous density measurement, offering real-time monitoring insight into gas density levels in SF6-insulated equipment, enabling proactive maintenance and preventing potential outages. The RS485/Modbus (RTU) output enables seamless digital communication integration with SCADA systems for remote monitoring and centralized control in utility networks. A floating change-over contact (SPDT) output provides reliable switching output for alarm systems or control functions based on pre-set density thresholds in power grids, and multiple switchpoints (1-3 microswitches) allow users to set multiple alarm thresholds for different density levels in SF6 gas-insulated equipment. The design ensures no contact bouncing, eliminating false alarms caused by vibrations, ensuring consistent performance in harsh operational environments like power plants.

The 879x boasts a long-term drift-free sensor output, minimizing the need for frequent recalibration and ensuring reliable long-term operation in utility infrastructure. Its maintenance-free design eliminates the need for routine maintenance, reducing downtime and costs critical for continuous operation in substations and transmission lines. An optional density indicator dial provides a clear and easy-to-read display of gas density levels, enabling quick assessment of system status in substations, and an optional integrated test/re-filling valve allows for easy testing and re-filling of gas without dismounting the monitor, simplifying maintenance procedures in utility equipment.

The robust construction of the 879x is designed to withstand harsh conditions in power grids, ensuring reliable performance over an extended lifetime. A variety of process connections are available to suit different utility system requirements for flexible installation, and EMC protection minimizes the impact of electromagnetic interference on measurement accuracy, ensuring reliable operation in noisy substation environments. Designed for use in both medium- and high-voltage systems, it broadens its utility across different power distribution systems to ensure compatibility with demanding electrical infrastructure requirements in substations and transmission lines. It offers high accuracy (±10kPa @ 20℃) in density and temperature measurements for reliable and informed decision-making in power grid operations.

Compatibility with SF6 and environmentally friendly alternative gases (e.g., nitrogen/CO2 mixtures), aligns the monitor with emission regulations in utilities. The device also meets environmental regulations due to RoHS/Reach compliance. Available with customizable options, such as dial scales and electrical connections, the 879x caters to specific utility needs.

For more information about the 879x Hybrid Gas Density Monitor RS485/MODBUS, go here.