In the long-term operation, the ring main unit will gradually age due to its internal insulation material under the action of electric field stress or the influence of the external environment, resulting in partial discharge, which has a greater risk to its safety and stability. Therefore, partial discharge monitoring of the ring main unit is of great significance to evaluate the operation status of the equipment, prevent accidents and improve the safety and reliability of the operation of power installations.
On the one hand, the partial discharge monitoring of the ring main unit is conducive to ensuring the safety of the equipment and prolonging the service life of the equipment. Partial discharge usually does not affect the entire electrical system, but long-term partial discharge will accelerate insulation aging and reduce the reliability and safety of equipment. Therefore, through the partial discharge monitoring of the distribution cabinet, the partial discharge problem can be found in time, and the corresponding measures are taken to repair and deal with potential safety hazards, which can effectively improve the safety of the equipment, prolong the service life of the ring main unit, and save the maintenance cost of the equipment.
On the other hand, the partial discharge monitoring of the ring main unit is conducive to ensuring the normal operation of the power system. The existence of partial discharge will gradually reduce the performance of the equipment, which will seriously lead to equipment failure and damage. As an indispensable power distribution equipment in the power system, the partial discharge problem of the ring main unit will have a serious impact on the power system once it occurs. Therefore, the partial discharge problem of the ring main unit can be found in time and the corresponding measures can be taken to repair it, which can ensure the normal operation of the power system.
Partial discharge monitoring of ring main unit is a method to evaluate the operation status of ring main unit by detecting the partial discharge signal generated inside the ring main unit. Shaanxi public has developed and designed a variety of monitoring equipment and solutions for the partial discharge monitoring of ring main units, such as the use of pulse current method and ultrasonic method. For the partial discharge monitoring of the ring main unit, the UHF electromagnetic pulse signal and the temperature of the temperature measurement point (such as cable joint) generated during the insulation discharge of the switch cabinet are monitored to achieve automatic analysis and diagnosis, and timely alarm. The UHF law detects the electromagnetic wave radiation and the temperature rise of the switchgear joint generated by partial discharge, and uploads the detected partial discharge data to the monitoring background for analysis and processing, so as to achieve real-time monitoring and alarm, so as to prevent all kinds of early insulation defects from developing into final breakdown accidents.
This article was written by Shaanxi Public Intelligent Technology Co., Ltd. Shaanxi Public Electric Co., Ltd.