British energy storage coil inductance

What are superconducting inductive coils?

Superconducting Inductive Coils, also known as Superconducting Magnetic Energy Storage (SMES) coils, combine superconductivity and magnetic energy storage concepts to store electrical energy.

What are superconducting magnetic energy storage coils?

Superconducting magnetic energy storage (SMES) coils, also known as superconducting inductor coils, are used to store electrical energy in the magnetic field of a large coil for later use. Their main purpose is to supply large, repetitive power pulses and for load leveling applications.

What is superconducting magnetic energy storage (SMES)?

1. Introduction Superconducting Magnetic Energy Storage (SMES) is a promising high power storage technology, especially in the context of recent advancements in superconductor manufacturing .

What is a good percentage of useable energy in a coil?

In Eq. (3), is the transport current in the coil when fully charged. Ideally, the percentage of useable energy, , should be close to 100%, requiring a very high value of . As this is not practically possible, due to the superconducting limitations, a reasonable target of 90% is assumed.

What is the transition temperature of a superconducting coil?

Superconducting coils must be operated below their transition temperature, which is typically 4.2 oK for liquid helium at atmospheric pressure. Nb-Sn can be operated at 14 oK, although its transition temperature is 18 oK.

How is the coil kept in the desired temperature range?

To maintain the superconducting coil at the desired temperature, it is either immersed in liquid helium or liquid is pumped through the conductors. In both cases, the conductor and helium are kept inside a vacuum jacket, radiation shields, liquid nitrogen shield (usually), and another vacuum shield. (5.3 Cryogenic Considerations)