Waveform retrieving system

Abstract

Abstract PURPOSE:To enable fast retrieval of the portion with a level above a reference value continuing for a specified time length, by memorizing the results of detection into another memory upon the detection of the level above a reference value when a waveform is written into a waveform memory. CONSTITUTION:The surge which is caused by a ground fault of a transmission line because of a thunder or the like propagates on the distribution line to reach a fault point locator and memorized into a waveform memory 11 through an A/D converter 10. Here, as the 1 level of the MSBD7 of the 8 bit digital value through an A/D conversion continues for more than a specified time, a counter 16 counts over and a 1-level signal is outputted on the output Q of a flip-flop 17. Consequently, addresses A15-A18 indicating page are latched with flip-flpps 18-21. Then, when the retrieval of a waveform is performed with a microprocessor 9, it is possible to retrieve the portion with the level above a reference value continuing for a specified time length at a high speed from the memory by reading out by outputs of the flop-flops 18-21.

Inventors

• 👤 Takayuki Taniguchi
• 👤 谷口　孝之

Bibliographic Details