ABB CEF Current Limiting Fuses 3.6, 7.2, 12kV, 6-200A High Voltage Fuse Links

ABB CEF Current Limiting Fuses 3.6, 7.2, 12kV, 6-200A High Voltage Fuses

ABB CEF high voltage fuses were designed to be applied inside gas insulated
switchgears (GIS).  The interaction between fuses and switch disconnectors
when limited heat dissipation conditions occur is not an easy task. This knowledge has been obtained mainly from practical tests performed under different loading conditions. First the maximum allowable power losses should be defined for the fuses so as not to exceed temperature rise limits according to the referred standard. Therefore, the rated current of fuses with power losses above this limit are de-rated to a safe level that takes into consideration the fuse load factor. This procedure should be verified by temperature rise and breaking tests. ABB uses this standard approach for SF6 switchgear and CEF fuses.

ABB CEF and CMF fuses are equipped with a combined indicator and striker system which is activated immediately when the fuse element melts.

General
The HRC generation of fuse links type ABB CEF is designed and tested according to IEC Publication 60282-1 (IEC 282-1). Dimensionally the fuse links are in accordance with DIN 43625. ABB’s high-voltage fuse links have the following properties:

• Low minimum breaking current
• Low power losses
• Low arc voltage
• High breaking capacity up to 63 kA
• High current limitation

Low power losses permit installations of these fuse links in compact switchgear. CEF fuses are of a back-up type -they have a zone between the minimum melting current and the minimum breaking current where the fuse links may fail to interrupt. For CEF fuse links this zone is very narrow. 

Overvoltages
In order to be current limiting, the fuse link must generate an arc voltage that exceeds the instantaneous value of the operating voltage. The switching voltage generated by the CEF fuse link is below the maximum permissible value according to IEC 60282-1 (IEC 282-1). The CEF fuse link can safely be used if the system line voltage is 50-100% of the rated fuse-link voltage.
 

ABB CEF Current Limiting Fuses 3.6, 7.2, 12kV, 6-200A High Voltage Fuse Links

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