1. Check before installation:

①. Check whether the specifications and models of the fuse are appropriate, whether there is a manufacturer and factory certificate.

②. Whether all parts of the fuse are complete and intact, whether there are cracks or damages in the porcelain parts.

③. Whether the dynamic and static contacts are in good contact, and whether the static contacts have moderate elasticity.

2. Installation of the fuse:

①. In order to facilitate the operation, the installation height of the fuse should generally be between 4.5 and 5m.

②. The angle between the fuse pipe and the horizontal plane should be maintained at an angle of 60 degrees to 75 degrees.

③. The distance between the phases of the drop-out fuse must meet the requirements of the regulations.

④. The upper and lower leads of the drop-out fuse should be connected reliably and in good contact.

⑤. When copper and aluminum are connected, use a copper-aluminum transition clamp.

3. The choice of fuse:

①. Use high-voltage fuse with manufacturer, production date and product qualification certificate.

②. Generally, transformers of 125KVA and below can be selected according to 2~3 times of the rated current of the high voltage side; transformers of 125~400KVA can be selected according to 1.5~2 times of the rated current of the high voltage side; transformers above 400KVA , Can be selected according to 1.5 times the rated current of its high voltage side; through calculation, when the fuse is less than 5A, considering the mechanical strength, it can be selected according to 5A.

③ It is strictly forbidden to use copper and aluminum wires instead of high-voltage fuses.

3. The operation of the fuse:

①. Operators should wear insulating boots, insulating gloves, and use insulating rods with appropriate and qualified voltage levels.

②. Before operation, all switches on the low voltage side of the transformer should be disconnected.

③. The closing of the fuse should follow: when opening the switch, first open the middle phase, then the leeward phase, and finally the windward phase; the closing operation sequence is opposite to the opening sequence.

④. The action should be accurate, fast and decisive when pulling and closing.