03-08-2016, 11:48 AM
Over Current Controller
An "Over Current Relay" is a type of protective relay which operates when the load current exceeds a preset value. In a typical application the over current relay is used for over current protection, connected to a current transformer and calibrated to operate at or above a specific current level.
Overview
The objective of this project is to design and fabricate an over current protection relay using 8051 based microcontroller. A current feedback circuit is used in this kit. The controller compares the current being consumed with the set current. If the current consumed goes higher than the set current the relay is tripped. All the information is accordingly displayed on the LCD.
Aim
The Objectives of this project is to design and fabricate over current protection relay using micro controller which can operate on the permissible conditions by setting the over current value.
Project Scope
The scopes of the project are:
1. To Convert load current into corresponding voltage value.
The load current (energizing current) will be measured by using current transformer and this output AC current will be then converted converted into corresponding Voltage level.
2. To convert the analog voltage into digital form.
The analog voltage level is then given to an ADC which then converts into corresponding digital value. And then the load current will display on the LCD.
3. Trip circuit breaker using microcontroller.
The over current value is set in the controller and when faults (over current) occur, controller will energize the circuit breaker tripping coil which will cause the circuit breaker to trip.
The over current value is set in the controller and when faults (over current) occur, controller will energize the circuit breaker tripping coil which will cause the circuit breaker to trip.
Introduction
Background
Electrical Power System protection is required for protection of both user and the system equipment itself from fault, hence electrical power system is not allowed to operate without any protection devices installed. Power System fault is defined as undesirable condition that occurs in the power system. These undesirable conditions such as short circuit, current leakage, ground short, over current and over voltage.
With the increasing loads, voltages and short-circuit duty in distribution system, over current protection has become more important today. The ability of protection system is demanded not only for economic reason but also consumers just expect ‘reliable’ service. In a Power System Protection, the system engineer would need a device that can monitor current, voltage, frequency and in some case over power in the system. Thus a device called Protective Relay is created to serve the purpose. The protective relay is most often relay coupled with Circuit Breaker such that it can isolate the abnormal condition in the system. In the interest of reliable and effective protection, some designers of power distribution/power controllers select relay as opposed to electro-magnetic circuit breakers as a method of circuit protection.
An "Over Current Relay" is a type of protective relay which operates when the load current exceeds a preset value. In a typical application the over current relay is used for over current protection, connected to a current transformer and calibrated to operate at or above a specific current level.
Overview
The objective of this project is to design and fabricate an over current protection relay using 8051 based microcontroller. A current feedback circuit is used in this kit. The controller compares the current being consumed with the set current. If the current consumed goes higher than the set current the relay is tripped. All the information is accordingly displayed on the LCD.
Aim
The Objectives of this project is to design and fabricate over current protection relay using micro controller which can operate on the permissible conditions by setting the over current value.
Project Scope
The scopes of the project are:
1. To Convert load current into corresponding voltage value.
The load current (energizing current) will be measured by using current transformer and this output AC current will be then converted converted into corresponding Voltage level.
2. To convert the analog voltage into digital form.
The analog voltage level is then given to an ADC which then converts into corresponding digital value. And then the load current will display on the LCD.
3. Trip circuit breaker using microcontroller.
The over current value is set in the controller and when faults (over current) occur, controller will energize the circuit breaker tripping coil which will cause the circuit breaker to trip.
The over current value is set in the controller and when faults (over current) occur, controller will energize the circuit breaker tripping coil which will cause the circuit breaker to trip.
Introduction
Background
Electrical Power System protection is required for protection of both user and the system equipment itself from fault, hence electrical power system is not allowed to operate without any protection devices installed. Power System fault is defined as undesirable condition that occurs in the power system. These undesirable conditions such as short circuit, current leakage, ground short, over current and over voltage.
With the increasing loads, voltages and short-circuit duty in distribution system, over current protection has become more important today. The ability of protection system is demanded not only for economic reason but also consumers just expect ‘reliable’ service. In a Power System Protection, the system engineer would need a device that can monitor current, voltage, frequency and in some case over power in the system. Thus a device called Protective Relay is created to serve the purpose. The protective relay is most often relay coupled with Circuit Breaker such that it can isolate the abnormal condition in the system. In the interest of reliable and effective protection, some designers of power distribution/power controllers select relay as opposed to electro-magnetic circuit breakers as a method of circuit protection.
