admin The trip circuit supervision relay always monitors the healthiness of the trip circuit including a connected trip coil of the CB. Tripping or isolation of CB is the most important part of power system protection. Always 02 nos. trip circuits are used in the CB for system redundancy. Due to the failure of the trip … Read more
Grading capacitor is commonly used in High Voltage Circuit Breaker for uniform voltage distribution across the Breaker contacts at CB open position. In a multi-break Circuit Breaker, Grading capacitors are connected in parallel with every break of the CB. Reasons for using Grading Capacitors in Circuit Breakers. When the capacitors are connected across the breaks … Read more
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 – Under Earthing, the circuit is physically connected to the ground to flow circulating current or fault current of the circuit to the protection of the system, Under Grounding, the circuit is physically connected to the ground to discharge the electrical energy to earth for protecting … Read more
Floating neutral is a condition, in which the neutral wire of any circuit is disconnected from the ground. In AC system, the neutral wire is permanently grounded 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. … 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
