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What are the protection measures of inverters?
- Sep 03, 2018 -

The inverter plays an important role in the conversion of photovoltaic power plants. The process of converting AC power into DC power is called rectification. The circuit that completes the rectification function is called a rectifier circuit, and the device that implements the rectification process is called a rectifier device. Or rectifier. An inverter with excellent performance should also have complete protection functions or measures to deal with various abnormal conditions that occur during actual use, so that the inverter itself and other components of the system are protected from damage. So what are the protection measures of the inverter?


(1) Input undervoltage protection:

When the input voltage is lower than 85% of the rated voltage, the inverter should be protected and displayed.

(2) Input overvoltage protection:

When the input voltage is higher than 130% of the rated voltage, the inverter should be protected and displayed.

(3) Overcurrent protection:

The overcurrent protection of the inverter should ensure that the load acts in a timely manner when the load is short-circuited or the current exceeds the allowable value, so as to protect it from inrush current. When the operating current exceeds 150% of the rated value, the inverter should be automatically protected.

(4) Output short circuit protection

The inverter short-circuit protection action time should not exceed 0.5s.

(5) Input reverse connection protection:

When the positive and negative terminals of the input are reversed, the inverter should have protection function and display.

(6) Lightning protection:

The inverter should have lightning protection.

(7) Over temperature protection, etc.

In addition, for inverters without voltage stability measures, the inverter should also have output overvoltage protection measures to protect the load from overvoltage.

(8) Starting characteristics

Characterizes the ability of the inverter to load start and performance during dynamic operation. The inverter should be guaranteed to start reliably under rated load.

(9) Noise

Transformers, filter inductors, electromagnetic switches, and fans in power electronics can generate noise. When the inverter is in normal operation, the noise should not exceed 80dB, and the noise of the small inverter should not exceed 65dB.