Photovoltaic box transformer intelligent protection monitoring device

Abstract

The invention discloses an intelligent protective monitoring device for a photovoltaic box-type transformer substation. The intelligent protective monitoring device is provided with a body unit circuit and a display unit circuit; wherein the body unit circuit is provided with an on-off signal input circuit, an on-off signal output circuit, a body unit communication circuit A, a body unit communication circuit B, a power acquisition circuit, a body unit CPU (central processing unit) circuit and a switch power supply circuit, wherein the power acquisition circuit consists of a current transformer circuit, a voltage transformer circuit and a low-pass filter circuit. The body unit CPU circuit is in signal and control connection with the other circuits. The display unit circuit is provided with a display unit communication circuit, a nixie tube display circuit, a multipath indicating lamp circuit, a keyboard circuit and a display unit CPU circuit; and the display unit CPU circuit is in signal and control connection with the nixie tube display circuit, the multipath indicating lamp circuit and the keyboard circuit. The intelligent protective monitoring device disclosed by the invention is suitable for protecting and monitoring a box-type booster transformer of a photovoltaic power grid, and is complete in structure and accurate in monitoring; and remote management and automatic monitoring of all information at the low voltage side of the photovoltaic box-type transformer substation are realized, and the photovoltaic box-type transformer can be protected.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic power generation, in particular to an intelligent protection and monitoring device for a step-up transformer of a box-type substation, that is, a box-type transformer, which is applied to the remote management and automatic monitoring of all information on the low-voltage side of a photovoltaic box-type transformer, especially to realize Protection of photovoltaic box-type transformers. Background technique [0002] Photovoltaic power generation, as a green, environmentally friendly and renewable energy source, has received more and more attention and developed very rapidly in China in recent years. Photovoltaic power generation technology has further matured, and the cost of photovoltaic power generation has dropped significantly. The State Grid issued "Opinions on Doing a Good Job of Distributed Photovoltaic Power Grid-connected Services (Provisional)", "Opinions on Promoting Distrib...

AI Technical Summary

Problems solved by technology

[0004] Since the 35kV or 10kV box-type transformer is far away from the central control room and is very scattered, the integrated automation system of the booster station has been unable to monitor and control the 35kV or 10kV box-type transformer

[0005] There are many disadvantages in using traditional power plant or substation system protection measurement and control devices: large size, high cost, narrow temperature range, resource allocation does not correspond, too many communication conversion links, etc.

For example, traditional measurement and control devices are generally equipped with many switching and analog inputs for multiple lines or multi-coil transformers, and there are also many switching outputs, making it difficult to adapt to the requirements of photovoltaic electric fields in terms of size, cost, resource allocation, and device installation. In particular, photovoltaic electric fields are generally located in areas with relatively harsh ambient temperatures, and equipment is often required to work normally at -40°C to -60°C, which is a severe test for the performance of each component of the device.

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