Distributed Panel-Based Fire Alarm Design

Abstract

The shopping center switchboard system consists of several parts: a 20 kV cabinet to a 20 kV to 380 V step-down transformer, which is then provided to the user to control the newly upgraded LVMDP (low voltage main switchboard). Before distributing to users, they need to pay attention to the fixed power factor of the capacitor bank. Lack of an exemplary power factor will cause an inductive load on the capacitor bank, high temperatures due to high loads will damage the capacitor bank. A switchboard safety automation technology with a microcontroller control system has been proposed to complete this research. Microcontroller control system for switch safety includes Microprocessor (Arduino Nano), light sensor (LDR), temperature sensor (LM35DZ), LCD 16x2 I2C, actuator (fan, buzzer, three-phase network disconnect switch relay), switch (5 VDC relay), ADC As data input. The working principle of the microcontroller is: if the LM35DZ sensor detects the specified temperature, an alarm will be triggered, while the LDR sensor detects a spark, the alarm will be triggered as a danger warning signal and cut off the power grid. Equipment designed to prevent switchboard safety caused by high temperatures or sparks can prevent fires.

Brake Current Control System Modeling Using Linear Quadratic Regulator (LQR) and Proportional integral derivative (PID)

“…With the help of Matlab these calculations can be done using the command "lqr()". However, before designing the LQR control, it is necessary to check the controllability of the system using the controllability matrix as shown in Equation (19). From this check, then the rank value for the controllability matrix is 2.…”

“…of iron plate. The performance system of the eddy current braking dynamometer is when the iron disc connected to the motor shaft rotates to receive the braking force input, the system uses a strain gauge sensor to determine the amount of braking force [19]. This sensor performs the function of detecting the magnitude of the braking force, which is converted into an analog signal and then the signal becomes a variable to be detected by the microcontroller.…”

“…If the input signal u cannot control the dynamics of each state, it will result in setting the dynamics of the state using the Q matrix which cannot control the performance and the R matrix which cannot regulate the effort of the system. The controllability properties can be known by using the controllability matrix CM as shown in Equation (19). If rank n of the controllability matrix shows the same result as the order of the system, it can be said that the system is fully controllable.…”

Implementasi Sensor Flowmeter pada Auxiliary Engine Kapal Berbasis Outseal PLC

“…Upaya penunjang perkembangan ekonomi di Indonesia salah satunya dengan melakukan perdagangan luar negeri yang terdiri dari ekspor dan impor barang menggunakan sistem transportasi peti kemas [2]. Sistem transportasi peti kemas merupakan gabungan antara berbagai moda angkutan yang dilakukan dengan menggunakan kontainer, bertujuan untuk memudahkan alih muat barang dengan menyederhanakan sistem bongkar muat sehingga efektif dan efisien [3].…”