What is the purpose of drop out fuse?

Drop Out Fuses are protection devices that protect networks and equipment from current surges and overloads. An overcurrent will melt the fuse element in the carrier disconnecting the line or equipment. They also provide network isolation points when manually operated with a hot stick.

Where are expulsion fuses used?

They are intended for use in enclosures (RBA) or outdoors (RDB) in power applications up to an operational voltage of 34.5 kV.

WHAT IS A expulsion fuse?

Expulsion fuses are vented fuses in which the expulsion effect of the gases produced by internal arcing results in current interruption. They are not current limiting and as a result, they limit the duration of a fault on the electrical system but not the magnitude.

Do you need to fuse the secondary of a transformer?

If secondary (600V or less) fuses are sized not greater than 125\% of trans- former secondary current, individual transformer fuses are not required in the primary (600V or less) provided the primary feeder fuses are not larger than 250\% of the transformer rated primary current.

What is striker fuse?

Striker fuse: These fuses are provided with a spring-loaded striker that can act as a visual indicator that the fuse has blown and also activate other switchgear. Switch fuse: A handle that is manually operated can connect or disconnect high current fuses.

What is the use of distribution transformer?

Distribution transformers are generally used in electrical power distribution and transmission systems. This class of transformer has the highest power, or volt-ampere ratings, and the highest continuous voltage rating. The power rating is normally determined by the type of cooling methods the transformer may use.

What is the function of fuse in an electric circuit?

In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current.

What is meant by fuse in physics?

Definition: A strip or wire of metal inserted in an electric circuit, which melts (or ‘blows’) and so interrupts the circuit when the current increases beyond a certain safe strength.

What is a distribution fuse?

In electrical distribution, a fuse cutout or cut-out fuse is a combination of a fuse and a switch, used in primary overhead feeder lines and taps to protect distribution transformers from current surges and overloads.

What is expulsion type HRC fuse?

3 Expulsion Type HRC Fuse. Expulsion type of fuses are used to protect transformers and feeders. It is designed for 11kv and limit is up to 250 MVA. The fuse element is placed inside the cylinder and the tops are linked to the equipment. These fuses have a cylinder designed with synthetic resin bond paper.

What is the purpose of using a fuse on the secondary side of transformer?

The sole purpose of a fuse is to blow in cases of short circuits (or when current exceeds the fuse rating). That said, fuses are used in a potential transformer circuit (Primary as well as Secondary) to protect from the PT’s winding faults and secondary circuit faults respectively.

Why does the secondary side of the transformer have a fuse?

All transformers are connected to the common secondary circuit through secondary fuses. The purpose of these fuses is to disconnect a faulty transformer from the secondary circuit. The size of the secondary fuse must be such that it will blow on a primary fault between its transformer and the associated primary fuse.

What is a medium voltage (MV) current-limiting fuse link?

Offering unparalleled short-circuit interruption capabilities, Medium Voltage (MV) current-limiting fuse links are the principle protection device used by electrical utilities and switchgear manufacturers throughout the world.

What is the rating of a high voltage cutout fuse?

High Voltage Cutout Fuse Breaker – rating voltage 10-40.5KV, AC 50HZ, three phase power transmission system. Power fuses are a generally accepted means of protecting power transformers in distribution substations. The primary purpose of a power fuse is to provide interruption of permanent faults.

Are power line fuses voltage critical?

Fuses are not voltage-critical; they may be applied at any voltage equal to or greater than their rated voltage. Fuses may not require additional structures, and are generally mounted on the incoming line structure, resulting in space savings in the substation layout.

What is the tripping curve of a fuse?

Fuses are available in a number of tripping curves (standard, slow, and very slow) to provide coordination with other system protective equipment. Fuses are not voltage-critical; they may be applied at any voltage equal to or greater than their rated voltage.