发明名称 |
SAMPLING SYNCHRONOUS SYSTEM FOR LOOP DIGITAL PROTECTIVE RELAY |
摘要 |
PURPOSE:To enable obtaining sampling data at the same time from respective terminal equipments by transmitting a code signal for each terminal equipment from a central relay apparatus, by computing the transmission delay time of each terminal through a return signal from each terminal and by outputting a signal expecting said transmission delay time from said central relay apparatus. CONSTITUTION:A signal coded for each terminal 8-1 to 8-3 is sent from the synchronous arithmetic circuit 4-1 in a central relay apparatus 1 to terminals 8-1 to 8-3 via an optical fiber cable(OFC) 9. The folded circuits 4-2 to 4-4 of respective terminals 8-1 to 8-3 fold only sampling signals attached with their own codes by transmitting said signals to the apparatus 1 via the OFC 10. The transmission delay time to each terminal 8-1 to 8-3 is obtained by said apparatus 1 and said sampling signal is outputted to each terminal 8-1 to 8-3 at any point of time after generation of a reference pulse and before the transmission delay time. |
申请公布号 |
JPH02179221(A) |
申请公布日期 |
1990.07.12 |
申请号 |
JP19880332478 |
申请日期 |
1988.12.28 |
申请人 |
MEIDENSHA CORP |
发明人 |
MISAWA AKITOMO;OKITSU TOSHIYUKI |
分类号 |
H02H3/02;H02H3/28;H02H7/26 |
主分类号 |
H02H3/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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