절연지는 운전 중 열, 산소 및 수분의 영향에 의해 시간 경과와 함께 셀룰로오스 분자 결합이 절단되어 강도가 저하되고 그 과정에서 푸르푸랄, 일산화탄소, 이산화탄소 등 노화 생성물이 생겨 절연유 속에 용해된다. 절연유도 운전 중에 발생하는 열, 탄소, 수분의 노화와 함께 도체가 촉매가 되고 노화
outage was occurred frequently and electric charge was risen sharply since late 1998.
③ Bankruptcy of PG&E
- As a result, PG&E (Pacific gas& Electric) suffered financial difficulties because energy supply costs had risen and selling prices had been regulated. They couldn't shift a burden to consumer. So, their deficit was accumulated and finally, they had to file for bankruptcy.
PG&E didn
In 1960’s
Government-led industry
After Korea war – shortage
of private capital
1961 Foundation of Korea
Electric Power
Corporation(KEPCO)
Consolidation of transmission
supplier (조선전업) and
distribution supplier
(경선전기, 남선전기)
In 1970’s
_Development and growth / Private participation
1967 Allowance of
3.2. PM(Preventive Maintenance)
3.2.1. What is the PM?
"Preventive Maintenance is a scheduled program of regular inspection, adjustments, lubrication, or replacement of warm or failing parts in order to maintain an asset's function, and efficiency (Ryan Cruzan, 2009)
Preventive Maintenance is the task that we perform to keep buildings in good condition. So Preventive Maintenance includes task
IoT in Agriculture Industry
Assignment 3
GROUP 1:
Table of Contents
Introduction……………………………………………………………………………..4
General Description…………………………………………………………...4
i. Current Business Model…………………………………………………...4
ii. Project Proposal and Justification…………