Reasons for the aging of terminals and the method of detection?

I. Reasons for the aging of the terminals and the method of detection? Generally speaking, the main reasons for the aging of the terminal block are as follows: 1) environment and temperature the external environment in which the terminal block is located and the heat source will also turn into the terminal block temperature is too high, insulation breakdown, and even explosion fire. 2) chemical corrosion terminal block shell insulation material due to prolonged chemical corrosion or electrolytic corrosion, resulting in the failure of the protective layer, the insulation is reduced, which will also lead to aggravate the aging of the terminal block. 3) Prolonged overload operation due to the thermal effect of the current, the load current through the terminals must lead to heat, thus making the terminals temperature, and excessive temperature will accelerate the aging of the insulation, especially in the summer, the aging of the terminals will be exacerbated. Terminal aging test method 1) 5 terminals mounted horizontally on a rail, using a rated cross-sectional area of the wire for connection, connecting wire at least 300mm long, and then measure the voltage drop of each terminal; 2) aging box temperature lower limit and temperature upper limit were set to 20 ° C and 75 ° C; 3) the temperature rise stage and reach a higher temperature after 10min of the duration of the phase, have the rated current flow, so that the test piece will reach the allowed higher operating temperature, here we should clearly know that the higher temperature value is 120 ℃. 4) Next for the cooling process, in every 24 heating and cooling cycles after the cooling state, measure the voltage drop once, the entire test process a total of 192 cycles. 5) The voltage drop before the test can not exceed 3.2mV, the voltage drop in the test and the test after the test must not exceed 4.8mV, and the measured value after 24 cycles must not exceed 1.5 times the initial value before testing.

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