An overhead low voltage (LV) fuse switch is a protective device used in electrical distribution systems for the protection of equipment and the prevention of overloads. They are used to protect the electrical equipment of the transmission and distribution system.
Product Description
Introduction
Cut-out bases and fuse carriers are rated at 230/400V as follows: Three phase and neutral for transformers up to 500kVA: 400A; and Three phase and neutral for transformers over 500kVA: 630A.
Casing
The outer casing of the equipment shall be made of grey insulating material of sufficient mechanical strength to resist damage. The material shall be resistant to ultraviolet degradation and have flame retardant properties. The grey colour shall be in accordance with the RAL 7035 code system as defined by DNA (Deutsches Normungsrat, Frankfurt, Germany).
Fuse holder
The fuse holder shall accept J.P. type 82mm centre cartridge fuse links to BS 88. Tightening screws shall have insulated tops to enable the fuse carrier to be removed without safety equipment (rubber gloves etc).
Application locations
The overhead low voltage (LV) fuse switch is used in various electrical distribution scenarios to protect equipment and maintain system reliability. Some common applications include
Protection of distribution transformers: LV fuse disconnectors are commonly installed in overhead lines to protect distribution transformers. If a transformer is overloaded or a short circuit occurs, the fuse will blow to isolate the transformer and prevent damage.
Rural electrification: In rural areas, where power is often distributed over long overhead lines, low-voltage fuse disconnectors are essential to isolate faults on specific sections of the line, minimising power interruptions to other areas.
Overhead power lines: LV fuse disconnectors are widely used in urban and suburban areas with overhead power lines. They protect the electrical grid by isolating faulty sections, preventing system-wide outages.
Renewable energy systems: In solar farms and wind turbines, LV fuse disconnectors are used to protect the electrical infrastructure from faults and overcurrent conditions, helping to protect expensive equipment.
Substations: LV fuse disconnectors are installed in electrical substations as part of the protection system for low voltage equipment, providing an additional layer of fault isolation and protecting the substation from electrical failures.
Industrial and commercial buildings: For large facilities connected to overhead power distribution systems, low-voltage fuse disconnectors are used to protect internal transformers and distribution lines from overcurrents and short circuits.
Temporary installations: Circuit breakers can be used in temporary or mobile installations, such as construction sites, to provide electrical protection for equipment connected to overhead distribution lines.