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The full form of ACCC is Aluminium Conductor Composite Core. This is one of the most advanced HTLS technologies. Here, instead of a stranded steel core, we use a reinforced core made of carbon fiber. Sometimes, we also use glass fiber for reinforcement. Construction of ACCC The main advantage of ACCC among other HTLS conductors … Read more
Insulators Used in Overhead Transmission Lines In overhead transmission lines, insulators support the conductor on metallic tower structures. At the same time, they electrically isolate the high-voltage conductor from the metallic body of the supporting towers. In high-voltage overhead transmission lines, engineers typically install insulator strings at the tip of the cross arms of towers. … Read more
What is LBB Protection? Local Breaker Backup (LBB) Protection is a special protection scheme. This protection isolates a fault from the electrical power system when a circuit breaker fails to do so. When a fault occurs at a particular point in a power system, the primary protection relay associated with that part of the system detects … Read more
Current transformers (CTs) play a critical role in protection and metering. The proper operation of protection relays depends on CT accuracy to detect faults. Additionally, the accuracy of CT is more important for metering purposes. However, when a CT experiences core saturation, its secondary output no longer represents the true replica of the primary current. … Read more
Acceptance Tests for 33KV Outdoor C.T (as per IS 16227:2016): Video on Testing of HV Current Transformer
We will discuss here in details the concept of Arc Voltage, Recovery Voltage, Restriking Voltage, RRRV Basic Concept of Arc Voltage, Recovery Voltage, Restriking Voltage, RRRV When contacts of a circuit breaker open under current carrying condition, electric arcs form in the gap between the contacts. This is due to ionization of the surrounding medium. … Read more
Circuit breakers are essential protective devices of electrical power systems. A circuit breaker safeguards electrical circuits from abnormal conditions such as overloads and faults. Among different tripping arrangements, the shunt trip mechanism is the most popular method for ensuring safe and reliable operation in high-voltage systems. In this article, we will explain the theoretical working … Read more
What is Normal Current Rating? This is the current represented in its RMS value. Electrical equipment can carry this current continuously without being overheated and without losing its desired performance. According to IC 62271, the definition of normal current rating of electrical equipment is the rated normal rms current that the electrical equipment can carry … Read more
In addition to the normal current rating of a circuit breaker (which is the current it can handle continuously during regular operation), there are two important categories of short-circuit current ratings that define how the circuit breaker performs during fault conditions: Rated Short Circuit Breaking Current The short-circuit breaking current of a circuit breaker consists … Read more
Discover the First Pole to Clear Factor. How does the highest restriking voltage in the first-clearing pole, divided by phase-to-ground recovery voltage, impact circuit breaker performance?123 characters (approx) In an AC system, the phase difference between the currents of each phase is \(120^\circ\). This means the current of one phase is \(120^\circ\) apart from the … Read more