Pocket DC Earth Fault Locator (P-DEL) for Alarm Interference of DC Power Supply using the Internet of Things

PT. Indonesia Power Kamojang POMU (Power Generation Operation Maintenance Unit) has one problem in the handling time of Ground Fault DC, where the handling time tends to increase over the last four years. This problem will impact the production cost, where energy consumption is fixed. Equipment maintenance costs are quite expensive, the absence of standard manual tracking and the use of tools as well as many cables that are corrosive into a vital factor in increasing the duration of this disturbance handling. This paper proposes a Pocket DC Earth Fault Locator (P-DEL) with current injection method by assembling Nodemcu V3, Arduino Nano, RTC DS3231, INA219 current Sensor that can make it easier to track DC Earth Fault alarm interference. P-DEL, which focuses on ease and flexibility of use and affordability of price, has been a solution to accelerate the duration of handling DC Earth fault in Kamojang POMU. With this device, it can monitor DC Earth Fault interference on the DC system Kamojang POMU. From the test results conducted on the workshop and tools of Kamojang POMU with standard load measuring, the device can inject current from 9 mA to 562.5 mA, and detect $22 \mathrm{K}\Omega$ maximal loads. Anyone can access the interference tracking data through the public view on the Web (ThinkSpeak). With the existence of P-DEL, it can minimize the work order alarm of DC earth fault interference into a backlog.