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How much do you know about spring fingers?


Release time:

2022-04-29

The principle of the spring contact finger, the spring contact finger as an elastic contact, it is installed between two rigid input and output electrical contacts. By compressing a certain proportion of the data, the enterprise produces elasticity, which can ensure safe and reliable contact.

How much do you know about spring fingers?


The principle of the spring contact finger, the spring contact finger as an elastic contact, it is installed between two rigid input and output electrical contacts. By compressing a certain proportion of the data, the enterprise produces elasticity, which can ensure safe and reliable contact.

弹簧触指

The principle of spring touch finger is as follows:

There are many contacts, and each spring ring is a contact, which means that many circuits are connected in parallel. The more contact points, the more turns, the smaller the contact resistance, the more shunts, and the smaller the current flowing through each turn. The number of turns is large, the current distribution is uniform, and the heat dissipation is good.

The relatively large constant contact force value range, the constant contact force value range is large, which can ensure that the contact resistance is basically unchanged under the vibration environment.

Based on the original spring touch finger, there can be different shapes of touch finger, single surface contact, double surface contact, round surface contact, etc.

The contact resistance of a single coil spring contact finger is 4-5 microohms. Taking a 50 coil contact as an example, the resistance is 0.1 micro-ohms. The resistance is very small, and the heat loss is also very small.

Beryllium bronze is hard and powerful. The strength of zirconium and copper is more suitable. The contact friction is less than half of the friction of the tulip contact, especially the high-current contactor, 3150/4000a contacts 82 contacts, the pressure is large, the circuit breaker shaking and shaking torque is large, it is difficult, but the spring contact does not Need a lot of operating force.

Plum contacts are treated with silver plating, but due to the large contact pressure and frequent contact, the wear and peeling of the silver plating layer will cause the copper as the anode to corrode rapidly, lose its excellent conductivity, and threaten the safety of power grid operation. Now the new technology is the application of contact substrate copper corrosion behavior under the current, the preparation of silver-graphene composite coating, improve the corrosion resistance and wear resistance of contact materials. Due to its high hardness, excellent wear resistance and corrosion resistance, the cost is too high.

The use of a spring contact finger due to the low working pressure, contact knowledge points, so the contact wear is small, shake in and out 10000 times. Moreover, each outer diameter is small, the current carrying capacity is large, the anti-short-circuit calculation ability is strong, and the electric field distribution of the contact system is uniform.

Many people will worry about the application of spring contact fingers in extraction circuit breakers. In fact, by improving the accuracy and positioning the positioning pin in advance, the requirement of spring contact fingers/-1mm can be fully guaranteed.

The spring fingers need not be round. Other shapes may be used for different applications, such as rectangular contacts for frame breakers, single-sided contacts for low voltage drawers, etc.


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