Synchronous data acquisition device of transformer substation and method

Abstract

The invention relates to a synchronous data acquisition device of a transformer substation and a sampling method thereof, relating to the technical field of transformer substation data sampling and aiming at solving the technical problem on how to reduce the site construction volume and the hardware cost. The device is characterized in that a communication host and various data acquisition terminals in the transformer substation are connected to a standard serial bus respectively through a programmable logic unit, wherein the programmable logic unit connected with the communication host is internally provided with a synchronous code pattern generating module, and the programmable logic units connected with various data acquisition terminals are internally provided with synchronous code pattern decoding modules; the communication host controls the programmable logic unit connected with the communication host to send synchronous code patterns to the standard serial bus at regular time; and all the programmable logic units connected with the data acquisition terminals are used for detecting the synchronous code patterns in a communication data stream in real time and controlling the data acquisition terminals to carry out synchronous data sampling after catching the synchronous code patterns. The device can reduce the site construction volume and the hardware cost.

Description

technical field [0001] The invention relates to the technology of substation data sampling, in particular to the technology of a substation synchronous data sampling device and a sampling method thereof. Background technique [0002] The current substation is equipped with a communication host and multiple data acquisition terminals. During the operation of the substation, each data acquisition terminal is often required to perform data synchronous sampling in order to perform vector calculation and comparison of related collection quantities. In existing substations, each data acquisition terminal adopts the following two methods for synchronous data sampling: [0003] Method 1: The communication host sends a synchronization pulse to each data acquisition terminal through a dedicated synchronization signal line, so as to realize the clock synchronization of each data acquisition terminal, correct the sampling interval time, and realize synchronous sampling. In addition to ...

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Problems solved by technology

[0003] Method 1: The communication host sends a synchronization pulse to each data acquisition terminal through a dedicated synchronization signal line, so as to realize the clock synchronization of each data acquisition terminal, correct the sampling interval time, and realize synchronous sampling. In addition to laying communication lines between data collection terminals, special synchronization lines also need to be laid, which will increase the complexity of on-site construction;

[0004] Method 2: Use the AC power line as the reference phasor. In addition to requiring the communication host and each data acquisition terminal to share a power line, this method must also use a dedicated signal sensor to convert the AC 220V power supply voltage into a small signal. Synchronization based on zero crossing is realized through op amp and analog signal processing, which is easily affected by interference and has high hardware cost

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