Copper-aluminum Composite Process: Analysis Of The Performance Of Bimetallic Terminals In Signal Monitoring

In modern electrical engineering, bimetallic lugs is widely known for its stability in handling copper-aluminum connections. Many engineers planning automated monitoring systems often wonder: does this type of component, primarily used for power transmission, possess the physical basis to support precision signal testing?

This terminal uses friction welding to fuse copper and aluminum, addressing the issue of loose contact caused by the different coefficients of thermal expansion of the two materials. For signal testing scenarios, its physical structure and electrical performance exhibit some interesting characteristics.

The impact of physical contact on signal transmission

bi metal cable lug plays the role of a physical medium in the signal link. Due to its high-pressure friction welding, the molecular-level bonding formed at the copper-aluminum interface reduces contact resistance, providing a pathway for the transmission of weak electrical signals.

• Low Resistance Characteristics: This terminal typically has extremely low contact resistance; for test signals in the mV (millivolt) range, the voltage drop it causes is negligible.

• Anti-Oxidation Coating: The surface is usually pre-coated with conductive paste, which mitigates the effects of the environment on the connection point, allowing the signal to remain stable over long-term operation and reducing sampling noise caused by oxidation.

• Structural Strength: Even under vibration, robust mechanical crimping prevents the signal circuit from easily breaking.

Precise Measurement: Bimetallic Terminal Blocks and Sensor Feedback

In complex industrial control networks, the bi metal lugs connectors is commonly used for the secondary side wiring of current transformers (CTs) or voltage transformers (PTs). This means it is essentially already performing the task of "signal transmission."

Resistance Variation and Sampling Accuracy

The molecular bonding layer of this bi metallic cable lugs can withstand frequent thermal cycling. For sensor signals that rely on resistance changes, such as resistance temperature detectors (RTDs), the connection stability at the terminals directly determines the accuracy of the displayed values. If ordinary wiring methods are used, electrochemical corrosion between copper and aluminum can create unstable contact resistance, leading to significant jumps in test results.

Shielding and Interference Suppression

When high-speed pulse signals or high-frequency data acquisition are involved, the bimetal cable lug device, as a passive component, does not provide additional shielding protection. In this case, technicians typically use shielded cables and reliably ground the shield through these terminals. In this combination, the conductive continuity of the terminals becomes the physical basis for suppressing electromagnetic interference.