Spring straps refer to their use in high-voltage electrical appliances
In the power transmission and distribution industry, electrical connection must have three characteristics: safety and stability. The spring band means very small heating power, very small contact resistance and stable and uniform contact force to ensure a good electrical connection. Combined with the actual planning requirements and experience, the spring strap contact fingers are briefly introduced.
Common problems with electrical connections and their causes
The main failure mechanism of electrical connection is poor contact, which is roughly 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 the relevant specifications, thereby affecting the insulation ability of the product, and even forming a short circuit.
Introduction to the skills of the spring strap touch
Common finger types on the market are spring strap touch fingers, spring fingers, plum fingers, self-operated fingers, etc. Reliable electrical connections are essential for power equipment and power systems, making it critical to choose the right contact solution.
Contact theory
Electrical connection refers to the connection of electrical energy transmission between conductors through mechanical force. However, the contact surface (surface contact area) where this mechanical force occurs is not equal to the useful contact surface of the load current. The contamination layer on the metal surface contains an ash layer, oil film and metal compounds, making the useful contact area much smaller than the surface contact area, and the current channel will be concentrated at a single contact point, resulting in an increase in contact resistance. That is to say, what appears to be a connection between surfaces is actually a connection between points.
Spring strap touches fingers
Spring strap touch finger The skill has been on the market since the early 60s of the 20th century and has been successfully used for more than half a century. It has become an excellent choice for demanding applications: it can operate safely in environments where temperature, oscillation and shock are critical; High current, very suitable for high load high voltage switch; The high number of mating and unplugging times can fully meet the life test requirements of the switch. Compared with spring fingers, the advantages of spring strap fingers are mainly concentrated in three aspects: small slot size, low contact resistance, and high stability.
Skill trend of spring strap fingers
Miniaturization is the trend of GIS development in the future, and the spring strap fingering skill is also getting used to this change and developing towards compactness.
As an electrical connector, spring band contact fingers are widely used in electrical appliances, circuit breakers, transformers, switchgears, gas-insulated busbars and other electrical products. The spring band finger fingers very small heating power, very small contact resistance, stable and uniform contact force, which can ensure a good electrical connection, thereby bringing more and more long-term benefits to the power system.
