Conveners
Thu-Mo-Po4.11 - Current Limiters & Breakers
- Tatsushi Nakamoto (High Energy Accelerator Research Organization, KEK)
- Neil Mitchell (ITER Organization)
Recently, the magnitude of the fault current in the grid has been increased due to the development of the electric power industry and the increase of the distributed power generations. Since the increase of the fault current may cause a bigger accident than the capacity of the existing installed protective equipment, it is necessary to replace the protective device with a larger capacity or...
Recently, flexible DC transmission has been developed rapidly in the Off-site grid interconnection. Inhibiting the sudden increase of DC current caused by short-circuit faults is necessary for the protection of power grid. Generally, the short-circuit faults may be caused by physical conduction or arcing and sparking. To address permanently damage the power grid, a resistance type...
To secure the reliable dissemination of the dc microgrid system, it is essential to establish efficient protection scheme. There are various protection methods of dc microgrid system : fuse, circuit breaker (Solid-state, Mechanical, Hybrid, etc.), superconducting fault current limiter (SFCL) and fault tolerant converter. Among the mentioned methods, the mechanical circuit breaker (MCB) has the...
In this paper, the flux-lock type superconducting fault current limiter (SFCL) with the mechanical switch (MS), which can be driven by self-driving coil to drive the MS unlike the previous SFCL, was suggested. The operational principle of the suggested SFCL with the MS is same as one without the mechanical switch, except that the MS is driven by electromagnetic repulsion force generated by the...
We have studied a DC circuit breaker with an HTS fault current limiting (FCL) module for 30 kV MDVC power grid. The attached FCL module can reduce the burden of the circuit breaker to make the system break the fault current faster as well as safer. In this paper, we will present the design of an HTS fault current limiting module with 2G REBCO conductor for the MVDC power grid with the rated...
This paper proposes a superconducting coupled DC circuit breaker that combines a superconductor with a mechanical DC circuit breaker for DC fault current interruption. The power burden and damage possibility of superconductors are determined by the recovery characteristics of the superconductor during the reclosing operation of the proposed circuit breaker. They also affect the breaking...
We propose arc-induction type DC circuit breaker combining the magnets as the mechanical circuit breaker suitable for the DC system. This circuit breaker simply composes the mechanical contacts, the induction needle, the ground wire and magnets. The arc is moved the induction needle according to the Lorentz’s force and it is inducted to the induction needle. The induced arc is flowing into the...
Since DC has no current zero point, an arc occurs when the DC circuit breaker performs a cuf-off operation. In this case, a fatal fault may occur in the circuit breaker or in the grid, due to the magnitude of the arc. Therefore, the cut-off operation and the reliability of the circuit breaker are important in the commercialization of HVDC. In this paper, a current-limiting DC circuit breaker...
In this paper, DC current limiting and interrupting operation of DC circuit breaker using double quench, which consists of DC circuit breaker (DCCB), series resonance circuit, surge arrestor and superconducting elements (SCEs), were analyzed. The suggested DC circuit breaker using double quench of SCEs can per-form twice DC fault current limiting operation in case of larger DC fault current...
