Converter Faults - Faults and Protection - High Voltage Direct Current Transmission

TL;DR

This video discusses the three basic faults that can occur in converter stations: faults due to malfunctions of the walls and controller, commutation failure in inverters, and short circuits.

Transcript

hello everyone welcome to ekita platform and this is ravin jang here your electrical faculty and in this video i'm going to talk about the fault converter so let's start the basic points which are related with the fault converters in this topic we are generally going to talk about the whatever the different types of falls actually occurring in your... Read More

Key Insights

• 🍰 Fault converters in converter stations can experience three basic faults: malfunctions of the walls and controller, commutation failure in inverters, and short circuits.
• 🇼🇫 Arc back, a fault occurring in mercury arc walls in reverse bias conditions, is not common in modern converter stations that use thyristor walls.
• 🫠 The majority of faults in mercury arc walls are due to backfires, causing stress on transformer windings.
• 🫠 Thyristors, unlike mercury arc walls, do not suffer from arc back, leading to their exclusion from modern converter stations.
• 🫠 Self-clearing faults, such as commutation failure, arc through, and misfire, are considered transient and can cause disturbances in the system.
• 🫥 Short circuits in converter stations can result in disruptions of the supply line and equipment.
• ✊ Understanding and addressing these fault conditions is crucial for maintaining the stability and functionality of converter stations in power systems.

Questions & Answers

Q: What are the three basic faults that can occur in converter stations?

The three basic faults are faults due to malfunctions of the walls and controller, commutation failure in inverters, and short circuits.

Q: What is arc back and where does it occur?

Arc back is a failure of the wall that occurs in reverse bias conditions, particularly in mercury arc walls. It causes temporary disruption of the rectifying property in AC to DC conversion.

Q: How does commutation failure in inverters affect converter stations?

Commutation failure in inverters can lead to faults in converter stations, causing disruptions in the system's operation.

Q: What happens during a short circuit in a converter station?

A short circuit in a converter station results in a large flow of current through the supply lines and equipment, leading to a disruption in the supply line and potential damage to the equipment.

Summary & Key Takeaways

• The video explains three basic faults that can occur in converter stations: faults due to malfunctions of the walls and controller, commutation failure in inverters, and short circuits.

• The first point discusses arc back, which occurs in reverse bias conditions, particularly in mercury arc walls. However, with advancements in technology and the use of thyristor walls, arc back is not a common issue.

• The second point highlights commutation failure in inverters, which can lead to faults in converter stations.

• The third point addresses short circuits in converter stations, which can result in a disruption of the supply line and equipment.