Siemens NXAIR - Page 260

Operating the removable voltage transformers
260 NXAIR / ≤ 40 kA 110-0134.9 / 14
Design types of removable voltage transformers
Replacing the protection fuse-links is carried out differently depending on the design of a removable voltage
transformer. There are four possible design types. Type 1 is substantially different from the others in that no
tool is required for (un-)locking the contact caps of the voltage transformer housing. The other types require a
tool. This tool is part of the delivery and is the same for all types.
Preconditions
• Removable voltage transformers taken out of the panel
• Set of proper protection fuse-links available
• Except for design type 1: Tool available
Procedure for design type 1: No tool required
Move the service truck with the removable voltage transformers away from the panel. The
protection fuse-links are accessible.
Fig. 470: Protection fuse-links accessible
Loosen the protection fuse-link by turning, and pull it out of the voltage transformer housing
with mounted contact cap.
Fig. 471: Loosening fuse-link
Fig. 472: Pulling fuse-link out of the housing
Detach the contact cap from the protection fuse-link.
Fig. 473: Detaching contact cap from fuse-link