High voltage switch cabinet temperature monitoring system based on PLC

Abstract

The invention provides a high voltage switch cabinet temperature monitoring system based on PLC (Programmable Logic Controller). The high voltage switch cabinet temperature monitoring system comprises the PLC, an optoelectronic isolation input circuit device, a relay, an executing mechanism, a high voltage switch cabinet, a contact temperature sensor, a conditioning circuit device, an optoelectronic isolation output circuit device, an on-site monitor, a communication device and a remote computer. The high voltage switch cabinet temperature monitoring system disclosed by the invention has the advantages as follows: 1. the wireless communication technology is used to perform remote data acquisition and monitoring, and the monitoring software is installed on industrial personal computers for remote monitoring and on-site monitoring, so as to bring convenience to users at different places to remotely monitor the temperature of the high voltage switch cabinet contact; 2. when the temperature is too high, the system can remotely send a command to implement effective measures, and the operation is in time and fast; 3. the system is provided with a friendly human-computer interface, so as to display audio-visual image directly, and ensure the system to be operated easily and conveniently.

Description

technical field [0001] The invention relates to an online monitoring system, in particular to a PLC-based high-voltage switch cabinet temperature monitoring system. Background technique [0002] High-voltage switchgear is used for on-off, control or protection in power system power generation, transmission, distribution, power conversion and consumption. High-voltage switchgear is used as electrical products with a voltage level of 3.6kV ~ 550kV. Switches, high-voltage load switches, high-voltage automatic reclosers and sectionalizers, high-voltage operating mechanisms, high-voltage explosion-proof power distribution devices, and high-voltage switchgears. It has higher requirements for the use environment, such as the upper limit of the ambient air temperature does not exceed +40°C; the average value of the ambient air temperature for 24 hours does not exceed +35°C; the lower limit of the ambient air temperature is not lower than -5°C or -25°C ℃. Most of the various compon...

AI Technical Summary

Problems solved by technology

The high temperature in the switchgear makes it difficult for the internal heat of low-voltage electrical appliances to dissipate outward during operation, so after a certain period of time, the insulation will burn out due to aging; plastic insulated wires will also be thermally aged and broken down; Current-operated protectors and electronic meters will seriously affect the service life of the product when they are operated at high temperatures, and will also affect the stability of the protector's performance, the reliability of the action, and the accuracy of measurement; The reactive power compensation capacitors and fuses of the switchgear will also shorten the service life; the switchgear operates outdoors, it not only receives high temperature from direct sunlight, but also generates heat itself during operation, so in the midsummer high temperature season, the temperature inside the cabinet will be Reaching above +60°C, the temperature at this time greatly exceeds the ambient temperature specified in the "National Standard" of these electrical appliances, which will cause the failure of the switchgear

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