Analysis Of Blackening Problem Of Neutral Block
Blackening of neutral blocks is a common problem in electrical systems, which poses a potential threat to the normal operation and electrical safety of electrical equipment. Its causes are diverse, and the following analysis is conducted from four aspects: poor contact, environmental factors, current factors, and terminal quality.
poor contact
Poor contact is one of the main reasons for the blackening of neutral blocks. Oxidation of wire ends, unreliable wiring of air switches, or oxidation of neutral contacts inside air switches can increase contact resistance, leading to local overheating and ultimately causing terminal blackening. For example, if the wire end is exposed to air for a long time, an oxide layer will form on the surface, affecting its conductivity and generating heat that causes the terminal to change color.
environmental factor
In high temperature and humid environments, copper terminals are prone to oxidation reactions, producing black copper oxide. At the same time, if there are corrosive gases in the environment, it will accelerate the corrosion of the terminal, causing its surface to turn black.
Current factor
When the current is too high, the terminal will accelerate oxidation due to heating. For example, excessive zero line load (including severe phase deviation) or overcurrent phenomena in the circuit, such as high power supply voltage, load short circuit, etc., can cause the terminal temperature to rise and lead to blackening.
Terminal quality
Quality issues with copper terminal components may also lead to blackening. If the quality of copper material is poor, or if the plating metal is not treated properly during processing, it will make it more prone to oxidation.
To address the issue of blackening of neutral blocks, corresponding measures can be taken, such as cleaning the oxide layer, tightening the wiring screws, replacing damaged terminals, improving the operating environment, etc., to ensure the safe and stable operation of the electrical system.
