The substation is one of the components of the electric power system that is an important role in the distribution of electrical energy and load regulation. In the process of distributing electrical energy, continuity of good service is needed, but the interferences still often occur, both internal and external. On Sunday, July 21, 2019 there was an interference, Lakarsantri feeder CB failed to trip so make the incoming 20kV CB trip. That interference was caused by the burning of the Switching Substation in the Citraland area. Therefore, a new relay setting is needed as a recommendation to use transformator 2 to avoid the recurrence of a similar fault.
The relay settings have shown good results where the working time of the relay on the outgoing feeder side is faster than the incoming feeder 20kV and the incoming transformator 150kV side, when coordination simulated using the E-TAP 12.6.0 software by entering the current setting and the time setting, it shows good coordination because when there is an interference on the outgoing feeder, CB outgoing feeder works first, not the incoming feeder 20kV CB or the incoming transformator 150kV CB.
Preventive maintenance on other equipment such as CB and CT need to be be done to increase of equipment reliability to reduce the occurs of protection failure or damage to the equipment
User review of mobile application is an valuable data that can be used by developer to improve their application or to build similar application. User can give feedback such as reporting errors, asking for new or improved feature, explain their experience of using certain feature and also praise or dispraise. User review or opinion data is very large in amount and difficult to analyze. It is time consuming and labour expensive to do it manually. Recent study has tried to extract product feature using word collocation. In this work, we try to improve the aspect extraction process by using only informative data. We took user opinion of 3 mobile application from application distribution platform. The experiment result indicate that our approach is able to improve the performance of collocation finding method..
General TermsInformation retrieval
This study aims to analyze the average consumption of electrical energy and the Intensity of Energy Consumption (IKE)and the effect of temperature of electrical equipment in the main panel of the AB and AC buildings on the applicable electrical standards in the AB and AC buildings of Politeknik Negeri Malang. From the research, the results of the average consumption of electrical energy in each building are 2591.96 kWh and 1799.74 kWh per month, the value of Energy Consumption Intensity (IKE) is 34.55 kWh / m2 and 34.11 kWh / m2, both results fall into the category of energy use. very efficient, all the equipment in the panels of the two buildings is in good condition according to the PLN SK DIR 520 2014 book, the highest temperature value of the safety equipment is 32.8 ᵒC at NH Fuse T. this is due to the current flowing of 34.29A, the value of the equipment with the lowest temperature of 27.8 C on MCB C16 with a maximum standard of 45 C, the current conductive capacity is still in accordance with using a 2.5 mm2 cable with KHA 46 A, while the load current for each branch is protected by MCB 10 A. For cooling in rooms that use AC The split is 28,000 BTU / hour and it is still below the standard of 38,000 BTU / hour
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