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Archive: Category «High Voltage»

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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… Read more

Jun 04, 2011 | Edvard

Figure 2.1 Single-phase enclosure GIS

GIS control system

For ease of operation and convenience in wiring the GIS back to the substation control room, a local control cabinet (LCC) is provided for each circuit breaker position (Figure 1)…. Read more

May 29, 2011 | Edvard

GIS control system

Grounding on wood pole transmission structures

Preferred three-phase grounding applications on wood pole structures using grounding cluster bars are shown in figures 1 and 2. Grounding cluster bars must be positioned just below the lowest elevation… Read more

Apr 26, 2011 | Edvard

Figure 3. – Example ground cluster bar attached to wood pole

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…. Read more

Apr 05, 2011 | Edvard

ABB Generator Circuit-Breakers Type HGI

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 | Edvard

MiCOM P139 Feeder Management and Bay Control

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 | Edvard

SF6 Gas Insulated Substations (GIS) - Mitsubishi Electric

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 | Edvard

Transients - Line Disturbances

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 | Edvard

Gas-Insulated Transmission Line - GIL
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