High Voltage
Construction and service life of GIS
GIS is assembled of standard equipment modules (circuit breaker, current transformers, voltage transformers, disconnect and ground switches, interconnecting bus, surge arresters, and connections to the rest of the electric power system) to match the electrical one-line diagram of the substation…. Read more
Jun 04, 2011 | By Edvard Csanyi
Energy and Power
How contactor controls an electric motor?
When a relay is used to switch a large amount of electrical power through its contacts, it is designated by a special name: contactor. Contactors typically have multiple contacts, and those contacts are usually (but not always) normally-open, so that… Read more
Jun 01, 2011 | By Edvard Csanyi
High Voltage
HGI generator circuit breaker – ABB
The circuit-breakers type HGI can be used as generator circuit-breaker in all types of power plants with unit sizes between 60 – 180 MVA and nominal voltages up to 21kV. If used as feeder breakers in industry plants, the nominal… Read more
Apr 05, 2011 | By Edvard Csanyi
Energy and Power
How circuit breaker trip unit works?
In addition to providing a means to open and close its contacts manually, a circuit breaker must automatically open its contacts when an overcurrent condition is sensed. The trip unit is the part of the circuit breaker that determines when… Read more
Mar 10, 2011 | By Edvard Csanyi
Energy and Power
Ecodial 3 – FAQ’s
Remark : You may renumber the functional names with the Automatic numbering of the View menu. Version 3.2 of Ecodial works from a cable database. If such a cable exists in the database, then you can use it. The short… Read more
Jan 22, 2011 | By Edvard Csanyi
High Voltage
SF6 gas as insulating and arc-quenching medium
Sulphur hexafluoride gas (SF6) is employed as insulation in all parts of the installation, and in the circuit-breaker also for arc-quenching. SF6 is an electronegative gas, its dielectric strength at atmospheric pressure is approximately three times that of air. It… Read more
Jan 06, 2011 | By Edvard Csanyi
Maintenance
Maintenance Of SF6 Gas Circuit Breakers
Sulfur Hexafluoride (SF6) is an excellent gaseous dielectric for high voltage power applications. It has been used extensively in high voltage circuit breakers and other switchgears employed by the power industry. Applications for SF6 include gas insulated transmission lines and’gas… Read more
Jan 04, 2011 | By Edvard Csanyi
Low Voltage
Maintenance Of Low Voltage Circuit Breakers
The deterioration of low voltage circuit breaker is normal and this process begins as soon as the circuit breaker is installed. If deterioration is not checked, it can cause failures and malfunctions. The purpose of an electrical preventive maintenance and… Read more
Dec 31, 2010 | By Edvard Csanyi
Medium Voltage
Comparison Between Vacuum and SF6 Circuit Breaker
Until recently oil circuit breakers were used in large numbers for Medium voltage Distribution system in many medium voltage switchgears. There are number of disadvantages of using oil as quenching media in circuit breakers. Flammability and high maintenance cost are… Read more
Sep 05, 2010 | By Edvard Csanyi
