The primary function of an earthing transformer is to provide a low-impedance path to ground for the neutral point of a power system. It is typically used in high-voltage power systems to limit the voltage rise due to earth faults and to provide a means of detecting and clearing earth faults.
When a ground fault occurs in a power system, the voltage at the fault point rises to a high level due to the low impedance path to ground. This high voltage can damage the insulation of the equipment and cause electrical shock hazards to personnel. Therefore, it is necessary to limit the voltage rise by providing a low-impedance path to ground.
The earthing transformer is designed to provide a low-impedance path to ground by connecting its neutral point to earth. The transformer's primary winding is connected to the high-voltage power system, and the secondary winding is connected to earth. The secondary winding is typically rated for a much lower voltage than the primary winding.
When a ground fault occurs, the earthing transformer provides a path to ground for the fault current. The fault current flows through the secondary winding, which is connected to earth, and the voltage at the fault point is limited to a safe level. This protects the equipment and personnel from the high voltage due to the fault.
In addition to limiting the voltage rise, the earthing transformer also provides a means of detecting and clearing earth faults. The earthing transformer is typically connected to the earth fault protection system of the power system, which detects earth faults and triggers the protection devices to clear the fault.
Electrical Interesting Questions | All Posts
Will a D.C Shunt Motor operate on an A.C Supply?What is Load Shedding Transformer? Applications of Load Shedding Transformers
What is XLPE Cables? Applications of XLPE cables
What is Silicon Rubber Insulator? Where Silicon Rubber Insulator is used?
What is a voltage detecting insulator? Where voltage detecting insulators are used?
What Is Vacuum Interrupter? How Vacuum Interrupters Work in Circuit Breaker?
What is Arc Chutes or Arc Divider or Arc Splitters In Circuit Breaker?
What is a High Voltage Detector? Where High Voltage Detector is Used?
What is Wave Trap? Where it is Used?
why generation is 11kv in the power stations?
Why Earth Pin is Thicker and Longer in a 3-Pin Plug?
Why are Bundle Conductors used in Transmission Lines?
What are the Colored Aerial Marker Balls on Power Lines For?
Why is Electric Power Transmission is Multiple of 11 i.e 11kV, 22kV, 66kV, etc?
Why Tertiary Winding is used in transformers?
Why PT and CT Terminals are Star Connected?
What is Oil Surge Relay in Transformer?
What is Stockbridge Vibration Damper In Transmission Line?
Why Stones are used in Sub-Station Switchyard?
Why Arc Horn is used in High Voltage Transmission Line?
Why tester does not work on DC?
What is Auto-Recloser In-Transmission System? How its Works?
What is Aviation Light? Why it is used?
Why Transformer Taps On High Voltage Side?
Why Earthing Transformer is used?
Why does a humming sound occur in high voltage transmission lines?
Why is shunt capacitor bank used in substation?
Why do the positive and negative wires spark when touched?
Why reactors are used in substations?