ã€China Aluminum Industry】 removes the oxide film of aluminum alloy conductors and reduces the contact resistance; changing the method of current introduction allows the test current to flow evenly across all conductor cross-sections, which can greatly reduce the measurement error and make the measurement closer to the true value. value.
National Standard GB/T3048.4-2007 "Test methods for electrical properties of electric wires and cables Part 4: Conductor direct current resistance test" 4.4.1 The test length of the type test states: "Recommended length of test specimen: Conductor cross section (95~185mm2) , take 3m; conductor cross-section 240mm2 and above, take 5m.†4.4.2 current end and potential end of the provisions: “Aluminum wire current introduction end can be aluminum pressure joints (aluminum nose), and according to the conventional crimping method pressure Connect so that the crimped conductors and joints are integrated."
For the laboratory test cable DC resistance, the use of aluminum alloy cable end cold crimping is a convenient operation, simple, economical and reasonable, and can guarantee relatively accurate results.
The test results show that the cable ends at both ends of the cable are crimped. The introduction of the current introduction end from the nose of the cable can indeed obtain a lower DC resistance value, making the actual measurement result closer to the true value.
For DC resistance testing of large-section aluminum or aluminum alloy cables, it is particularly necessary to perform the method specified in the standard. Because the cable is actually installed and operated, power is also supplied to the power system after the end cold crimping. This approach makes the test result closer to the actual resistance of the aluminum alloy conductor.
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