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Watch band contact finger: the application of watch band contact finger in high voltage electrical apparatus


Release time:

2021-09-06

In the power transmission and distribution industry, the electrical connection must have three characteristics: safety and stability. Very small heating power, very small contact resistance and stable and uniform strap contact fingers can ensure good electrical connection performance. According to the actual design requirements and experience, the technical principles and typical applications of the contact fingers of the watchband are briefly introduced.

Watch band contact finger: the application of watch band contact finger in high voltage electrical apparatus

Strap Touch FingerIn the power transmission and distribution industry, electrical connections must have three characteristics: safety and stability. Very small heating power, very small contact resistance and stable and uniform strap contact fingers can ensure good electrical connection performance. According to the actual design requirements and experience, the technical principles and typical applications of the contact fingers of the watchband are briefly introduced.

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Common problems and causes of electrical connection

The main failure mechanism of electrical connection is poor contact, which is generally manifested as increased contact resistance or unstable contact resistance. Poor electrical contact will cause abnormal heat generation of the product, exceeding the allowable temperature rise value specified in relevant standards, thereby affecting the insulation capacity of the product and even causing a short circuit. The general phenomena and possible causes of poor contact are as follows:

Technical introduction of the contact finger of the watchband

The common watchband touch finger types on the market are strap touch finger, spring touch finger, plum blossom touch finger, self touch finger and so on. Reliable electrical connections are essential to power equipment and power systems, so choosing the right touch scheme is crucial.

Strap contact theory

Electrical connection refers to the electrical energy transmission connection between conductors by mechanical force. However, the contact surface (surface contact area) generated by this mechanical force is not equal to the effective contact surface of the load current. The pollution layer on the metal surface includes ash layer, oil film and metal compound, so that the effective contact area is much smaller than the surface contact area, and the current channel is concentrated in a single contact point, resulting in an increase in contact resistance. In other words, what appears to be a connection between faces is actually a connection between points and points.

The advantages of the strap touch finger

The technology of the strap touch finger has been on the market since the early 1960 s and has been successfully applied for more than half a century. It has become a better choice for demanding applications: it can operate safely in environments with strict requirements on temperature, vibration and shock; high current, very suitable for high-load high-voltage switches; high number of plugs, which can fully meet the life of the switch Test requirements. Compared with the spring contact finger, the advantages of the strap contact finger are mainly concentrated in three aspects: small slot size, low contact resistance, and high stability.

The development trend of the technology of the contact finger of the watchband

Miniaturization is the trend of future development, and the technology of the contact finger of the watchband is also adapting to this change and developing towards miniaturization.

The main products of Nantong Moore New Material Technology Co., Ltd. are GIL connector, beryllium cobalt copper, watchband contact finger, spring contact finger, special-shaped plum contact finger, composite watchband contact finger, charging pile current connector, chrome zirconium copper, copper alloy, copper alloy spring, etc. Nantong Moore New Material Technology Co., Ltd. is developed from its predecessor Nantong Moore Electric Co., Ltd., which is an enterprise specializing in the design, development and research of high-strength and high-conductivity alloy materials and electrical connection products. Companies in the industry has achieved a high degree of recognition and reputation of the majority of customers. The company in line with professional advanced, pioneering spirit, set up rigorous and pragmatic, the basic concept. To do a product, cast a boutique for the purpose of the enterprise, and give full play to the characteristics of flexible and diverse enterprises, intentions to serve every customer.

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