Conveners
Wed-Mo-Po3.09 - Current Limiters II
- Martin Eibach (GSI)
- Mark Ainslie (University of Cambridge)
For the application of superconducting wires to fault current limiting devices, it is required that they have a high rated voltage when a fault occurs. Stabilizer-free coated conductors, particularly, shows a good performance for the high rated voltage, which is beyond 0.6 V/cm. In this study, using the stabilizer-free coated conductors, we made fault current limiting devices and examined...
We investigate the comparison of fault current characteristics between the separates three-phase flux-lock type superconducting fault current limiter(SFCL) and integrated three-phase flux-lock type superconducting fault current limiter(SFCL). The single-phase flux-lock type SFCL consists of two coils. The primary coil is wound in parallel to the secondary coil on an iron core and...
The paper presents the design and test results of a conduction cooled flux coupling type superconducting fault current limiter. The 6 kV / 140 A SFCL was tested with a 2500 MVA short-circuit generator at a high power test facility. The design of the limiter consists of two parallelly connected and magnetically coupled windings cooled by single stage cryocooler. Magnetically compensated...
With the development of integrated power system (IPS) applications in navy, medium voltage direct current (MVDC) for shipboard electrical distribution is widely focused on. Compared with medium voltage alternating current (MVAC), MVDC is more adequate and affordable to meet electrical demand of future destroyer. However, one of the bottlenecks restricting the development of MVDC in shipboard...
The level of short circuit current in power system is increasing rapidly, flux-coupling superconducting fault current limiter based on paralleled superconducting windings can effectively limit short-circuit current by the increased impedance after decoupling of the windings. The superconducting windings of high coupling factor is the core component of this SFCL, and the voltage distribution of...
The resistive superconducting fault current limiter (RSFCL) is widely used in high voltage direct current transmission based on modular multilevel converter (MMC-HVDC) to effectively limit the fault current and facilitate the interruption of the DC circuit breaker. During current limiting process, the RSFCL needs to withstand an overcurrent impact with a magnitude of several times the critical...
With the development of DC power supply systems, breaking capacity of circuit breakers has been increasingly unable to meet the growing requirements for DC system short-circuit current level. To ensure the safety of the systems, a fault current limiter must be used in series with circuit breakers. The properties of superconducting fault current limiters such as fast reaction rate, simple...
With the development of modern power systems, the generation of fault currents and the system sensitivity to fault currents have increased. A superconducting fault current limiter (SFCL) is emerging as an alternative to reducing such fault currents in alternating current (AC) and direct current (DC) systems. SFCL can perform faster current limit operation as well as automatic fault current...
In recent years, power devices using direct current are increasing rapidly. Especially, the development of renewable energy including photovoltaic power generation has led to the expansion of direct current (DC) power generation sources, so that interest in DC systems is increasing. However, the obstacle in the DC system is that dc circuit breaker (DCCB) is still under development. In this...
To efficiently protect a high voltage direct current (HVDC) system containing line commutated converter (LCC) and voltage source converter (VSC), this study proposes to coordinate resistive superconducting fault current limiters (SFCLs) and hybrid DC circuit breakers (HDCBs) to clear the DC line fault. The principle modeling of the resistive SFCLs is stated, and the impacts of the SFCLs on the...
In order to effectively solve the low-voltage ride-through (LVRT) issue of a virtual synchronous generator (VSG) under severe grid fault, this paper proposes and studies the application of a flux-coupling-type superconducting fault current limiter (SFCL). Since the magnetic flux of the SFCL has a high controllability and its current path can be flexibly adjusted to cause the quench of high...
Fault current is one of the basic threats to the elements of power systems. Fault current in a shorted circuit is usually many times greater than the current occurring during normal operation of the network equipment. Fault current flow can cause thermal and dynamic harmful effects on the operation of power equipment. Electrodynamic forces occurring during the fault current flow can...
