Remote temperature sensing and monitoring system and method for 0.4kV low voltage switch

Abstract

The invention discloses remote temperature sensing and monitoring system and method for a 0.4kV low voltage switch. The system mainly comprises a temperature sensor, a temperature logging device with a communication function, a field RTU (Remote Terminal Unit), a master station RTU and a computer equipped with monitoring software. According to the remote temperature sensing and monitoring method, the temperature sensor sends temperature signals of all main contacts of the 0.4kV low voltage switch to the temperature logging device; the temperature logging device with a communication function communicates with the field RTU and sends the temperature signals to the field RTU and then sends the temperature signals to the master station RTU; and then, the master station RTU communicates with the computer; and contract temperature values of the switch and alarming images which are monitored by a display screen are displayed on the computer. The temperature logging device can be replaced with a temperature module of a PLC (Programmable Logic Controller), and if the field RTU is changed into a field PLC and the master station RTU is changed into a mater station PLC, the remote temperature sensing and monitoring can also be realized.

Description

technical field [0001] The invention relates to a temperature control automation technology, in particular to a system and a method for monitoring the operating state of a low-voltage switch by using the online temperature telemetry technology for live parts of a 0.4KV low-voltage switch in the microcomputer comprehensive automation of a substation. Background technique [0002] At present, substations using microcomputer integrated automation in China have shown great advantages in terms of function, structure, operation reliability, ease of use, simplicity of maintenance, and rapid upgrade of the automation system. However, the popular and mature integrated automation of substations is mostly used in high-voltage systems above 10KV (mostly in power supply companies). The common 35KV or above 10KV high-voltage incoming line of the factory power supply system is stepped down twice. The automatic monitoring and protection of its power transformation and distribution equipment...

AI Technical Summary

Problems solved by technology

The common 35KV or above 10KV high-voltage incoming line of the factory power supply system is stepped down twice. The automatic monitoring and protection of its power transformation and distribution equipment generally only involves 35KV or 10KV substations or transformers. Few manufacturers consider the 0.4KV low-voltage The implementation of "telemetry" in the power supply system, even if it is considered, is limited to the "telemetry" of current and voltage parameters, and does not take into account the crucial parameter of temperature, making the existing automation system 0.4 for the most hidden troubles in substations. The operation of KV low-voltage switches has always lacked effective monitoring means, and most of them are still in the stage of manual inspection and inspection by the on-duty staff

The inspection efficiency is low, and it is easy to ignore and omit hidden faults. It is often repaired after a fault occurs or a loss is caused. It is difficult to achieve targeted preventive maintenance and treatment.

The general monitoring of parameters such as current and voltage cannot fully reflect the working status of the actual switch during operation, especially whether there is any abnormality, defect or hidden trouble in the low-voltage switch.

Images