Intelligent Load Shedding System

Intelligent Load Shedding  System

This system continuously monitor the connected load in a industry and disconnect if the load go above the preset level. Here the total load is divided three categories. The authorized person may set connecting load by using keypad. If the connected load go above the previously set value it will warn 30sec to reduce the connected load otherwise the system disconnect the load from the mains one by one. The user can connect the load using the keypad attached to this device or the device will automatically connect the load after a preset interval.

Microcontroller

            PIC is a family of Harvard architecture microcontrollers made by Microchip Technology. The name PIC initially referred to "Peripheral Interface Controller". Mid-Range devices feature a 14-bit program word architecture and are available in 8 to 64-pin packages. These microcontrollers provide 1.8-5.5V operation, speeds up to 20 MHz, interrupt handling and an 8-level deep stack. These devices are available in various peripheral and memory configurations and feature serial analog and digital peripherals.

Load

            Connected load.

Current Sensor and Signal Conditioner

            Current sensing transformers are used in applications where one needs to detect or measure AC-currents. Current transformers (abbreviated as CT) are current sensors. They reduce alternating high current circulating through cables in electrical installations. The secondary winding supplies AC proportional to the current conducted through the primary

Voltage Sensor and Signal Conditioner

            Voltage Sensing Transformers, sample high voltage through the primary and deliver an exact replica to the secondary at a lower voltage.

LCD

            This is a basic 16 character by 2 line display. Black text on Green background. Utilizes the extremely common HD44780 parallel interface chip set. It will need minimum 6 general I/O pins to interface to this LCD screen. Includes LED back light. This will work in 4 bit and 8 bit mode.

Keypad

            For entering preset values, setting cut off limits etc

Buzzer

            Which is used for producing audio alarm to indicate over load.

Relays

            Relays are electro-mechanical components which allow a low-power circuit to switch a relatively high current on and off, or to control signal that must be electrically isolated from the controlling circuit itself.

RTC

            A real-time clock (RTC) is a clock (most often in the form of an integrated circuit) that keeps track of the current time. RTCs often have an alternate source of power, so they can continue to keep time while the primary source of power is off or unavailable. This alternate source of power is normally a battery .

Power supply

            In mains-supplied electronic systems the AC input voltage must be converted into a DC

voltage with the right value and degree of stabilization. The ac from the transformer secondary is

rectified by a bridge rectifier and filtered by the capacitor. A Linear voltage regulators produce regulated output voltage.