What is an 11KV VCB?
Table of Contents
What is an 11KV VCB?
11KV VCB. 🔍 SAFVOLT offers a wide range of 11KV VCB, which delivers excellent performance. In order to prevent fires and power surges, these circuit breakers are used in areas where electric crisis may occur. These circuit breakers finds application in medium voltage power system.
What is VCB switchgear?
VCB stands for vacuum circuit breaker. This type of circuit breaker uses vacuum media for quenching the arc. In VCB vacuum is used because the dielectric strength of the vacuum is far better than any type of medium. The vacuum is the superior dielectric medium of extinct using the arc compared to other mediums.
How many types of VCB are there?
By the arc extinction medium, the circuit breaker is categorised into four types. They are the air break circuit breaker, air blast circuit breaker, sulphur hexafluoride circuit breaker and vacuum circuit breaker.
How do I select a VCB rating?
The voltage rating for a VCB can be up to 35 kV….Observe the base specifications for their 12 kV VCB:
- Rated voltage = 12 kV.
- Rated current = 630 A, 1,250 A.
- Rated breaking current = 25 kA.
- Rated short-time withstand current (3s) = 25 kA.
- Rated short-circuit making current (crest factor) = 63 kA (50 Hz), 65 kA (60 Hz)
How much vacuum is in a VCB?
The vacuum circuit breaker comprises a steel arc chamber in the center-symmetrically arranged ceramic insulators. The pressure inside the vacuum interrupter is maintained below 10^-4 torr.
What is VCB panel?
A VCB panel is a type of circuit breaker where the arc quenching occurs in vacuum environment. .VCB or Vacuum Circuit Breaker is renowned technology today and is also known as the most reliable current interruption technology for medium voltage switchgears.
How is VCB size calculated?
Observe the base specifications for their 12 kV VCB:
- Rated voltage = 12 kV.
- Rated current = 630 A, 1,250 A.
- Rated breaking current = 25 kA.
- Rated short-time withstand current (3s) = 25 kA.
- Rated short-circuit making current (crest factor) = 63 kA (50 Hz), 65 kA (60 Hz)
How is switchgear size calculated?
Before you can order switchgear, you need to determine what size breakers you will need for each feeder….Feeder No.
- I=kVA x 1000/(V x 1.732) I=569.19kVA x 1000/(13,800V x 1.732)
- Amps at 13,800V=27.88A.
- I=kVA x 1000/(V x 1.732)
- Amps at 13,800V=15A.
- I=kVA x 1000÷(V x 1.732)
Why VCB is compact in size?
Vacuum circuit breakers have a small switching stroke as compared with other types of circuit breakers, so their breaking unit is small in size. To take full advantage of this feature, the operating mechanism has been designed to reduce the size and mass of the circuit breakers.
What is breaker size?
A circuit breaker is rated in amperes (A), and the rating tells us how much current can safely flow through the breaker without causing it to trip. For example, a 15 A breaker allows up to 15 A of total load to be connected simultaneously.
What do you need to know about 11kV vacuum circuit breakers?
This document specifies the requirement for design, manufacture, testing, supply, and delivery and performance requirements of 11 kV vacuum circuit breakers for use on the Project 11kV Distribution System. The switchgear shall be of any of the following genetic types, subject to the conditions stated in this Specification.
What kind of switchgear does ABB make?
Medium Voltage Switchgear Medium Voltage Switchgear 11KV VCB Panels VD4 VCB -ABB make Key Features : Indoor Panels / Outdoor Kiosks
What are the IEC standards for high voltage switchgear?
The specification is based upon, or has reference to, the following international Standards: IEC 60298: 1994: A.C Metal Enclosed Switchgear and Control Gear. IEC 60529: 1999: Classification of Degree of Protection provided by enclosures. IEC 60694: 1996: Common specification for High Voltage Switchgear and Control Gear
Where to connect The 11kV winding to the CB panel?
The 11kV winding shall be connected to the circuit side of the CB panel. The P.T. shall be withdrawable and the live connecting spouts shall be able to be locked-off using a 1 1/2” pin tumbles pad lock. All rails, wheels etc. necessary for isolating the P.T. shall be provided, 1 set for each P.T. supplied.
