Quality Testing Methods And Standards For NH Fuses

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Appearance Inspection

1. Check the external structure, connection parts, labels, etc. of the NH Cylindrical Fuse links. There is no obvious damage or loss. This includes checking for damaged fuses, loose or poor contacts, and broken fuses.
2. Check whether the contact points of the NH Cylindrical Fuse links are intact, tightly contacted, and whether there is overheating.
3. For NT/NH series square filled fuses, special inspection is required to see if there are traces of flash discharge on the porcelain insulation part.

 

Parameter Determination

1. Measure the rated voltage, rated current, rated power-off capability and other parameters of the Square series fuse to ensure that it meets the design requirements. This can be done through the use of specialized testing equipment.
2. Check whether the ratings of the fuse and fuse match the protected equipment so that they can cut off the current and protect the circuit from damage when the circuit is overloaded or short-circuited.

 

Functional Testing

1. For fuses with telemetry functions, the telemetry function needs to be checked, which can obtain current, voltage and other information in real time.
2. Conduct an action time test to determine whether the fuse's action speed is normal by testing the action time of the fuse under rated operating conditions. This helps the fuse react quickly if a circuit failure occurs.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fuse Blowing Ability Test

Use standard short-circuit current to test and observe whether the fuse can blow quickly. This is a very critical item in the fuse quality inspection, because the main function of the fuse is to cut off the current when the circuit is overloaded or short-circuited.

 

Temperature Rise Test

Measure the temperature rise of the fuse under normal operating conditions to determine whether it is normal. Excessive temperature rise may cause the fuse to degrade or be damaged, so this test is very important for the long-term stable operation of the fuse.

 

 

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