High Voltage
MiCOM P139 – Feeder Management and Bay Control
MiCOM P139 is a cost-effective one-box solution for integrated numerical time-overcurrent protection and control. The unit’s protection functions provide selective short-circuit protection, ground fault protection and overload protection in medium-… Read more
Mar 30, 2011 | By Edvard Csanyi
High Voltage
Economics of GIS
The equipment cost of GIS is naturally higher than that of AIS due to the grounded metal enclosure, the provision of an LCC, and the high degree of factory assembly…. Read more
Mar 04, 2011 | By Edvard Csanyi
High Voltage
Transients – Line Disturbances
Lightning strikes and switching transients on power lines will propagate down the line and eventually arrive at a substation. There, the voltage will be clamped by lightning arresters to a… Read more
Jan 21, 2011 | By Edvard Csanyi
High Voltage
Gas-Insulated Transmission Line – GIL
The gas-insulated transmission line (GIL) is a system for the transmission of electricity at high power ratings over long distances. In cases where overhead lines are not possible, the GIL… Read more
Jan 12, 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… Read more
Jan 06, 2011 | By Edvard Csanyi
High Voltage
Use Of Vacuum As A Breaking Medium
SF6 and vacuum are the two most modern breaking techniques in the fields of Medium Voltage (from 1 to 52 kV) and High Voltage (> 72.5 kV). They appeared in… Read more
Dec 22, 2010 | By Edvard Csanyi
High Voltage
Basics Of Subtransmission Systems
Subtransmission systems are those circuits that supply distribution substations. Several different subtransmission systems can supply distribution substations. Common subtransmission voltages include 34.5, 69, 115, and 138 kV. Higher voltage subtransmission… Read more
Dec 17, 2010 | By Edvard Csanyi
High Voltage
IEC 62271-200 – HV Switchgear And Controlgear
Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV Switchgears are important nodal points in modern power distribution. Correspondingly… Read more
Dec 09, 2010 | By Edvard Csanyi
High Voltage
ABB – 145kV Compact indoor substation with Disconnecting CB
Turnkey 145 kV S/S project for Borlänge Energi, Sweden, emphasizing the advantages of ABB Disconnecting Circuit Breakers. Small footprint enables indoor air insulated Switchgear solutions, increasing the power substation availability… Read more
Nov 15, 2010 | By Edvard Csanyi
High Voltage
Gas-Insulated Substations – GIS
A gas-insulated substation (GIS) uses a superior dielectric gas, SF6, at moderate pressure for phase-tophase and phase-to-ground insulation. The high voltage conductors, circuit breaker interrupters, switches, current transformers, and voltage… Read more
Nov 10, 2010 | By Edvard Csanyi
