Hideyuki Kameda

Setting method of specific parameters of a superconducting fault current limiter considering the operation of power system protection-resistance-type and rectifier-type SFCLs in overhead transmission systems

We have developed an EMTP model of a resistance-type and a rectifier-type super-conducting fault current limiter (SFCL) and defined their parameters which a user specifies when he plans to introduce an SFCL into a power system. Using these models, we propose the setting method of these parameters so as not to affect the response of protective relays when SFCLs operate.

The setting method of the specific parameters of a superconducting fault current limiter installed at the bus-tie and response of protective relays at operation of the SFCL

We have investigated the setting method of specific parameters for a resistance-type and a rectifier-type superconducting fault current limiter (SFCL) installed in trunk transmission lines and the response of protective relays when SFCLs operate against a system fault. This paper describes the setting method of specific parameters of an SFCL installed at a bus-tie in a trunk substation, response of protective relays such as bus protection and line protection when the SFCL operates against a system fault and countermeasure of preventing tripping a sound line due to unwanted operation of some distance relays resulted by reverse current at operation of the SFCL.

Operation tests for SN transition superconducting fault current limiter in the power system simulator

One of important problems to be solved in Japanese trunk transmission systems is the reduction of short-circuit capacity. As one solution, double buses are split into two buses in some substations. In recent years, dispersed generators have been introduced in lower voltage classes due to the deregulation of the electricity. A fault current exceeding the capacity flows during a short-circuit fault by the connection of dispersed generators. One of the key technologies for solving the above problem is the fault current limiter. We are presently conducting research on the effect of the introduction of fault current limiters into a power system. In this paper, we describe the results of operation tests of the SN transition superconducting fault current limiter (SCFCL) using 3 phases of SCFCL modules against various kinds of system faults or inrush current in the power system simulator installed at Central Research Institute of Electric Power Industry (CRIEPI).

Estimation of replacement of numerical relay systems from reliability analysis

Reliability Analysis System for Protection Relays (RASPR) is developed by CRIEPI, has been introduced into all of 11 Japanese electric power utilities. RASPR is a powerful tool to study the improvement of maintenance procedure and to investigate the replacement of aged relays based upon the accumulated data. RASPR is mainly composed of the database and the analysis system; in the former part, the equipment data and the failure data can be accumulated. The latter has functions to totalize the various kinds of data, to analyze the reliability, and to analyze the failure rate by Weibull distribution. We have contributed to Japanese electric power utilities through studies on rationalization of maintenance procedure. Already in Japan the period of cyclic testing was extended such as to eight years from six years based on the reliability analysis. This paper describes as follows; 1) the reliability analysis results and Weibull distribution using the accumulated data of 13 years, 2) the estimation of the deterioration for the 1st generation (introduction from about 1985) and the 2nd generation (introduction from about 1994) numerical relays, and 3) the estimation of the replacement of aged numerical relays.