One of the important electrical properties of the electrical connector is insulation resistance, which can also be called an insulating material between the electrical connector and the contact part. If the performance of insulation resistance is low in the process of use, it may cause signal loss, and serious damage to the equipment. The following Lillutong Lillutong will introduce the connector insulation resistance principle definition and the 6 factors affecting the safety index!
Connector insulation resistance principle definition:
Insulation resistance is the leakage resistance of the insulating part between the electrical connector and the contact housing as shown by the application of voltage. Insulation resistance (MΩ) = voltage (V) or leakage current added to the insulator. The main function of insulation resistance is to test whether the insulation performance of the connector meets the requirements of the circuit design and the requirements of the relevant technical conditions.
There are many factors that affect the insulation resistance safety specifications of connectors. The following are analyzed based on six factors: humidity, electric shock distance, low air pressure, material quality, electric shock distance, and cleanliness.
1. connector insulation resistance humidity
The increase of insulation resistance moisture will reduce the dielectric voltage, resulting in a variety of adverse factors.
2. Electric shock distance of insulation resistance of connector
The shock distance of insulation resistance refers to the shortest distance measured along the insulator surface between the contact and the contact. Because the short electric shock distance is likely to cause surface current, the installation holes of the pins on the surface of the insulation mounting board of some connectors are designed with concave and convex steps to increase the electric shock distance and improve the ability to resist surface discharge.
3. Low pressure of insulation resistance of connector
When the insulation resistance is high in the air, the insulation material will emit gas to pollute the contact, and increase the temperature generated by the electricity, leading to the decline of the voltage performance and the short-circuit fault of the circuit. Therefore, non-sealed electric connectors used at high altitudes must be derated. According to the technical standard of electrical connector, the withstand voltage is 1300V under normal conditions, and the pressure drop is 200V under low pressure conditions.
4. connector insulation resistance material quality
The quality of the insulation resistance material determines whether the insulation resistance of the connector can meet the requirements of the preset voltage performance.
5. Electric shock distance of insulation resistance of connector
The shock distance of insulation resistance refers to the shortest distance measured along the insulator surface between the contact and the contact. Because the short electric shock distance is likely to cause surface current, the installation holes of the pins on the surface of the insulation mounting board of some connectors are designed with concave and convex steps to increase the electric shock distance and improve the ability to resist surface discharge.
6. Connector insulation resistance cleanliness
The internal and surface cleanliness of insulation resistance has a great influence on dielectric voltage resistance. After the test, the required voltage of a product is 1500V, while the applied voltage in the actual test is 400V, resulting in a breakdown between the two contacts. After investigation, it was found that there were impurities mixed in the adhesive, which led to the breakdown of the bonding interface of the two insulation mounting plates on the insulator, so the cleanliness of the insulation resistance is very important.
After reading the above, I believe you should understand the principle definition of connector insulation resistance and the six factors affecting the safety index.
Post time: Mar-03-2023