Thermal power plant electrical automation anti-electromagnetic interference control cabinet

Abstract

The invention discloses a thermal power plant electrical automation anti-electromagnetic interference control cabinet, which comprises a stainless steel cabinet body, a wiring channel device arranged in the stainless steel cabinet body and dividing the space in the cabinet into a plurality of areas, a wiring hole formed in the wiring channel device, and a PLC, a frequency converter, a transformer and a power supply access end arranged in areas divided by the wiring channel device. The areas divided by the wiring channel device in the stainless steel cabinet body comprise a PLC placement area located above the wiring channel device, a frequency converter placement area and a transformer placement area located below the wiring channel device, and matching element placement areas located in the middle of the wiring channel device. By adopting an anti-electromagnetic interference cabinet body design, adopting a partition arrangement and additionally arranging an anti-interference element, various internal and external electromagnetic interference protection measures are formed, and the condition of control failure of the PLC and the frequency converter caused by electromagnetic interference is effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of anti-electromagnetic interference of control cabinets, and in particular relates to an anti-electromagnetic interference control cabinet for electrical automation of thermal power plants. Background technique [0002] In order to improve the degree of automation of the condensing equipment of thermal power plants, PLC controllers and frequency converters are added to the control cabinet. The additional PLC controllers and frequency converters are connected with pressure measurement terminals, liquid level measurement terminals, pressure valve relays, and liquid level valve relays. and other components together constitute the control system. In daily operation, it is found that the PLC controller and the frequency converter often have control failures. The operator inspected the control cabinet and found that the control cabinet is an ordinary iron cabinet. The PLC controller and the frequency converter ar...

AI Technical Summary

Problems solved by technology

[0002] In order to improve the degree of automation of the condensing equipment of thermal power plants, PLC controllers and frequency converters are added to the control cabinet. The additional PLC controllers and frequency converters are connected with pressure measurement terminals, liquid level measurement terminals, pressure valve relays, and liquid level valve relays. and other components together constitute the control system. In daily operation, it is found that the PLC controller and the frequency converter often have control failures. The operator inspected the control cabinet and found that the control cabinet is an ordinary iron cabinet. The PLC controller and the frequency converter are installed close to each other without any shielding measures, and other components are not arranged in partitions. Components are prone to mutual electromagnetic interference, which affects the operation of PLC controllers, frequency converters and components

[0003] In various industrial control cabinets, with the widespread use of power electronic devices such as PLC controllers and frequency converters, the electromagnetic interference of the system is becoming more and more serious. The abnormal operation of connected equipment has brought serious hidden dangers to the overall normal operation of the control system, and even caused production safety accidents. Therefore, the corresponding anti-interference design has become more and more important. How to improve the anti-electromagnetic interference ability of the system It is an important content that cannot be ignored in the design, development and application of the control cabinet

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