【 New patent introduction 】 A kind of intelligent watt-hour meter calibration system based on PLC distributed IO - Measuring instrument -

by:Coolmay     2020-07-05
Today to introduce a national invention patent authorization & ndash; — A kind of intelligent watt-hour meter calibration system based on PLC distributed I/o. The patent by the priorities of liaoning province power co. , LTD. , chaoyang power supply company to apply for, and on April 24, 2018 authorized announcement.

content this invention relates to an intelligent watt-hour meter calibration equipment, especially relates to a kind of intelligent watt-hour meter calibration system based on PLC distributed I/o.

invention background intelligent watt-hour meter is the smart grid terminal, it implements the basic electricity metering is no longer need to measure human, also has the electricity information storage, two-way rate measurement functions, user control function, various data transfer mode of two-way data communication function, preventing electricity-stolen function, etc. It's like a miniature computer, realizes the remote control, automation, intelligent, convenient. Users only need to the electric power business hall or in the human the POS pay electricity, can continue to use electricity. At present, the intelligent watt-hour meter has become the mainstream of the electricity meters equipment, metering device check into the power system to provide customer service priority, it is a link between thousands of homes, is the key to the national grid service node.

now for intelligent watt-hour meter calibration is generally personnel to the scene, using electric power testing instrument to test and verify, its efficiency is low, and the waste is serious. A local power supply company, the total number of the customer table are generally more than millions of hits, so the daily operational workload is very large, if continue to use traditional way to work, it is difficult to obtain good working effect. Content

invention the present invention provides an intelligent watt-hour meter calibration system based on PLC distributed IO, the setting of voltage transducer and current transducer at the user's site directly output to the user's voltage and current detection intelligent watt-hour meter, the electric meter output to the user's voltage and current value sent to a remote server, used to calculate the electric meter output to the user's actual power, at the same time, PLC distributed IO communication way also read the internal intelligent watt-hour meter number of electric energy metering, and sent to the remote server and voltage transducer and current transducer to detect the actual user of electric power value compare check.

at present invention system structure diagram

in order to achieve the above purpose, adopted by the technical scheme of the invention is: a kind of intelligent watt-hour meter calibration system based on PLC controller distributed I/o, the CPU module, including S7400PLC ET200 distributed IO, voltage transducer and current transducer, protocol converters, DTU serial passthrough module and the intelligent watt-hour meter is detected. The CPU module to Profibus S7400PLC - DP communication way connected to ET200 distributed IO, ET200 distributed IO DP interface with multiple intelligent watt-hour meter were detected by protocol converters of RS485 ports are connected.

ET200 distributed I/o configuration module, there are multiple AI AI AI port of module to connect multiple voltage transducer and current transducer output side, voltage transducer and current transducer primary side and the intelligent watt-hour meter is detected user output at the connection. S7400PLC main CPU module of RS485 serial port through DTU serial passthrough module connection cloud server, through the cloud server to connect to a remote terminal management personnel. The intelligent watt-hour meter is detected for intelligent watt-hour meter with RS485 interface. Voltage transducer for ac single-phase voltage transducer, models for YPD - U - V2- P5 - 04 and enter 0 4-250 v, output 20mA。 Current transducer for alternating current transducer, models for YPD - 我- - - - - - A4 - P5 - 04 and enter 0 4-15 a, output 20mA。 Protocol converters for RS485 - MODBUS type DP protocol converter, models for MOD - PROFIBUSV2 . 2.

compared with existing technology, the beneficial effects of the present invention is: 1) USES the setting at the scene of the users of voltage transducer and current transducer output to the user's direct detection intelligent watt-hour meter, voltage and current to the output to the user's meter voltage and current value sent to a remote server, used to calculate the electric meter output to the user's actual power, at the same time, PLC distributed IO communication way also read the inside of the intelligent watt-hour meter number of electric energy metering, and sent to the remote server and voltage transducer and current transducer to detect the actual user of electric power value compare check, saving the cost of on-site check; 2) Can realize real-time detection data to upload, query and sharing, and managers can at any time to compare the watt-hour meter calibration; 3) For electric power enterprises to improve service quality, improve customer satisfaction.

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