| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve long-time suppliability and maintainability of a digital protective relay by reducing the effect when the components thereof are improved or eliminated. <P>SOLUTION: The digital protective relay includes a printed circuit board 8A for arithmetic processing and a module substrate 9 which includes MPU 20, ROM 23, and RAM 24 which are to be mounted on the printed circuit board 8A via a removable connector 36. Furthermore, individual module substrates for a program ROM for protective relay calculation, a program ROM for sequence processing, a setting value ROM for protective relay calculation, and a setting value ROM for sequence processing may be mounted on the printed circuit board for arithmetic processing via a removable connector. <P>COPYRIGHT: (C)2009,JPO&INPIT |
