Active power distribution network intelligent terminal storage battery isolated monitoring device

Abstract

The invention relates to an active power distribution network intelligent terminal storage battery isolated monitoring device. The active power distribution network intelligent terminal storage battery isolated monitoring device comprises a signal input protection module, a signal isolated transmission module, a signal output protection module and a signal sampling and processing module, wherein the signal input protection module, the signal isolated transmission module, the signal output protection module and the signal sampling and processing module are connected in series with one another sequentially; and the core device of the signal isolated transmission module is a transformer with two primary windings and two secondary windings. According to the active power distribution network intelligent terminal storage battery isolated monitoring device of the invention, the transformer is adopted as a realization carrier of signal transmission isolation, and a monitored storage battery is adopted as a synchronous signal excitation source for signal transmission; and a protection circuit is additionally arranged at an input signal end and the secondary side of the transformer, so that surge and fast transient test anti-interference requirements can be satisfied. The active power distribution network intelligent terminal storage battery isolated monitoring device has the advantages of simple structure, low cost and high monitoring precision in use.

Description

technical field [0001] The invention relates to the field of active distribution network intelligent terminal monitoring, in particular to an active distribution network intelligent terminal storage battery isolation monitoring device. Background technique [0002] The battery in the intelligent terminal equipment of the active distribution network is used as a backup power supply, and it is responsible for supplying power to the intelligent terminal and the operation switch during a power outage. For the reliability of the power grid, it is necessary to monitor the battery status of the intelligent terminal of the active distribution network by configuring corresponding devices. [0003] There are two types of traditional devices used to monitor the storage battery of intelligent terminals in active distribution networks: one is the voltage / frequency conversion device: it converts the voltage signal into a frequency signal by using a voltage-frequency conversion chip, and t...

AI Technical Summary

Problems solved by technology

[0003] There are two types of traditional devices used to monitor the storage battery of intelligent terminals in active distribution networks: one is the voltage / frequency conversion device: it converts the voltage signal into a frequency signal by using a voltage-frequency conversion chip, and the frequency signal passes through the high-speed The optocoupler is isolated and transmitted to the CPU for sampling; the disadvantage of this type of device is that the accuracy of converting voltage into frequency is limited, resulting in low sampling accuracy, and at the same time, because the continuous counting of frequency signals takes up more CPU resources, the cost is higher

Second, the front-end CPU is used for AD sampling, and the sampling signal is transmitted to the main CPU through an isolated communication serial port; the disadvantage of this type of device is that the front-end sampling CPU is susceptible to interference, and it is difficult to meet the requirements of fast transients on the basis of adding a large number of protection circuits. Anti-interference, surge anti-interference and other EMC test requirements. At the same time, due to the serial communication between the sampling CPU and the main CPU, one serial interface of the main CPU is occupied. Difficulty in hardware resource allocation and high cost of peripheral circuits

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