A one day field visit to 400/220/66 kV Malbase substation
A one day field visit to 400/220/66 kV Malbase substation during its complete maintenance and testing of 400 kV 200 MVA ICTs and power transformers including oil conditioning was organised by eACCESS cordinator of College of Science and Technology, Phuentsholing Bhutan.
Mr. Cheten Tshering, Sr. Divisional Manager and Mr. Pema Wangchuk, Engineer (Electrical) Substation Maintenance Division, Transmission Department, Bhutan Power Corporation Ltd, Phuentsholing, Chhukha were the resource persons during testing and hands on training.
During one day field visit, following testings are conducted;
- Demonstartion of cooling of power transformers by oil forced and air forced cooling
- Operation of Buchholz relay
- Transformer winding ratio test
- Transformer IR test
- Winding resistence test
- Breaker operation test
Brief Profile of the Speaker
Mr. Cheten Tshering is currently serving as the Sr. Divisional Manager, Substation Maintenance Division, Transmission Department, Bhutan Power Corporation. He is an alumnus of CST, graduated in 2009, and has also served as the chief councillor of the college. He has an experience of 12 years in power transmission and distribution sector under BPC. He specializes in Power System Planning, Designing, Control and Protection.
Mr. Pema Wangchuk is currently working as maintennace engineer at Malbase 400/220/66 kV substation. He had bachelors of Engineeirng in Electrical Engineering from college of Sciecne and Technology, Bhutan in July 2014.
Discussion of eACCESS and Erasmus Plus Program
A forum initiated by the International Office and Cooperation of Soegijapranata Unika in an activity called ‘Lets Talk 2 O 1’ was held last Friday (13/3) in the Green room of the Mikael building.
This event, which was held for the first time, invited two speakers, namely Dr Florentinus Budi S ST MT and Agustina Sulastri S Psi PhD Psychologist to share experiences about the opportunity to get a grant from Erasmus.
As explained by the Head of the International Office and Cooperation, Dr. Heny Hartono SS MPd, as the organizer of the “Lets Talk 2 O 1” activity.
“This forum is a forum for lecturers, students, alumni and even educational staff to share experiences related to international or global issues.”
So the hope is that through this forum, the Unika academic community will start to broaden their global horizons, then they will also have the same enthusiasm to be ready to become global citizens, he continued.
“Today’s activities are the first in 2020, and we chose the topic of the eACCESS program and how to get grants at Erasmus Plus, which focuses more on cooperation with countries in Europe,” explained Heny.
eACCESS is a joint program of 8 universities in Europe and Asia to develop a connected electric power system. In addition, this grant from Erasmus Plus is not only used for research, but also for various other things such as curriculum development. And thankfully, from Soegijapranata Unika there are already two lecturers who have succeeded in getting grants from Erasmus Plus, namely Dr. Florentinus Budi S ST MT and Agustina Sulastri S Psi PhD Psychologist.
The two Unika lecturers have received grants with different schemes. For Agustina Sulastri PhD, the key one scheme is about mobility, namely faculty, staff and student mobility. Meanwhile, Dr. Florentinus Budi has a key two scheme, which is about capacity building for higher education.
The hope is that by sharing their experiences they can be an inspiration to all the attendees, Heny concluded.
Discussions with fishermen on the feasibility of using solar power in fishing boats. A solar powered boat system, in principle, is the use of conventional electric motors that are easily available in the market (with an AC voltage rating of 220 Volts and a frequency of 50 Hz) with a source of electrical energy generated by solar panels. This system is generally applied in areas where there is no source of electrical energy from PLN or conventional generators. A solar powered boat system can be designed using the components below. With how each element works as follows:
Solar panels: generate electrical energy in the form of DC voltage
MPPT: a static converter to maximize the generation of electrical energy by solar panels
Batere (Aki): to store electrical energy
Inverter: a static conveter to convert 12 Volt DC voltage to 220 Volt AC voltage for the water pump
Motor: a device capable of converting AC electrical energy into a motor rotation coupled to the propeller
In designing a solar powered boat system, some data is needed as a basis for engineering considerations, including:
Solar radiation level
Electric motor capacity
Battery storage capacity
Solar panel capacity
Based on location data, the system design is approached by the following calculations.
- Electric motor
If it is assumed that the motor used is around 1000 Watt, the minimum rating of the inverter used is 1000 Watt / inverter efficiency. If the efficiency of the inverter is 80%, the minimum rating of the inverter used is 1000 Watt / 0.8 = 1250 Watt.
If the duration of the boat is operated without sunlight = 2 hours (evening, night or morning) then the energy required is 1000 Watt x 2 h = 2000 Wh. Assuming energy is taken from 60% of the battery capacity, the required battery is 2000 Wh / 0.6 = 3300 Wh. A 12 Volt 50 Ah battery has a stored energy of 12 V x 50 A h = 600 Wh, so that to meet the energy of 3300 Wh, 6 50 Ah batteries or other combinations are needed to reach 3300 Wh.
- Solar Panel
To determine the size of a solar panel requires the following understanding, if the effective time for available sunlight is 4 hours (10am to 14pm), assuming:
The motor can be operated for 2 hours without solar energy (via battery), it takes a total energy of 1000 Watt x 2 h = 2000 Wh / day
Energy of 2000 Wh must be generated from the conversion of solar panel energy for 4 hours so that every hour 2000/4 = 500 Wh of energy is required per hour or the equivalent of 500 Watt of power.
If the efficiency of solar panels is assumed to be 50%, a solar panel with a rating of 500 / 0.5 = 1000 Wp is needed
Summarise output of the event:
- experiment of solar panel system application
- calculation of the economic feasibility of using a solar power system