In addition to the general protection, backup impedance protection or distance protection is also used in Generator, Transformer & Reactor to protect during external faults in the power system. Generally, impedance protection is most commonly used for the protection of transmission lines. When the Impedance value goes below the set value during the fault or … Read more
The main difference between earthing and grounding is that in earthing, the circuit connects directly to the ground to let the fault current flow safely and protect the system. In grounding, the circuit connects to the ground to release excess electrical energy and protect people and devices. What is Earthing? Earthing is used for the … Read more
Floating neutral happens when the neutral wire of a circuit disconnects from the ground. In an AC system, engineers always ground the neutral wire permanently to the earth. However, floating neutral may occur in a power system due to loose connection, braking of neutral flat, wrong circuit connection, or due to short circuit. What is … Read more
Volts and amps (ampere) are the two different measures of Electricity. In a close circuit, the electric potential difference between two points is called Voltage and the flow of electrons through the close circuit is called electric current. The volts is the measure of voltage between two points and amps is the measure of electric … Read more
AC or Alternating current is an electric current that continuously changes its magnitude with time and periodically reverses its direction. In Direct Current or DC, there is no change in direction, and the magnitude of the current is also the same. AC current is most commonly used for home and industrial purposes. Most of the … Read more
OLTC stands for On-load tap changer which is used in Transformer to regulate the output voltage. OLTC is installed inside the transformer main tank. It is operated by a Drive mechanism which is connected to OLTC through a tie rod. Generally, the Drive mechanism is mounted on the outside body of the Transformer. Based on … Read more
mAh stands for milli Ampere hour which defines the total capacity of current a mobile battery can deliver in an hour time. To express the total storage capacity, the mAh rating is used in a mobile battery. A higher mAh rating means a higher storage capacity of the battery. For example, a battery rating of … Read more
DGA (Dissolved Gas Analysis) is an important tool for checking the healthiness of oil-filled power transformers. Power Transformer is important and expensive equipment in Power Transmission and Distribution systems. Periodic checking or testing of the transformer is done to maintain the healthiness of the transformer. Transformer oil is used for insulation and cooling of the … Read more
When the voltage goes higher than the rated voltage is called Over Voltage. It is a very common issue in Power systems. System voltage is to be maintained as per the designed voltage for the stability of the power system. All the equipment and insulators used in substations and transmission lines are designed for a … Read more
After opening the Circuit Breaker under load or fault condition, a transit voltage appears across the breaker contacts which is called Restriking Voltage. Frequency of Restriking voltage goes in kH. During arcing period, transient voltage appears across the contacts at or near current zero. If dielectric medium between the CB contacts is greater than the … Read more