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In case of gas leakage a micro-switch is actuated. Thresholds for refilling first stage or lock-out alarm second stage can be mechanically set. The response character is shown in the Molier diagramme. The winding has at least three electrical connection points called taps. The voltage source and the load are each connected to two taps.
Gas Insulated Switchgear (GIS) General Presentation
One tap at the end of the winding is a common connection to both circuits source and load. Each tap corresponds to a different source or load voltage.
In an autotransformer a portion of the same winding acts as part of both the primary and secondary winding. Serial Optic Link 2. Voltage sensor 3. The output signal is at a low level, so it is immediately converted by an enclosure mounted device to a digital signal.
The current sensor is based on a Rogowski coil a coreless inductive current transformer. The voltage sensor is based on a capacitive electrical field sensor Capacitive ring sensor. The capacitive ring, which acts as a voltage sensor, also has a linear characteristic and is very simple in terms of the insulation. Circuit-breaker 3.
Current sensor Rogowski coil 4. Electro-optical voltage transformer 6. Make-proof earthing switch 7. Control cubicle. Circuit Breaker 3. Current Transformer 4. Voltage transformer 5. Hi-Speed ES 67 7. This is achieved by a sliding contact characterized by three defined positions: Depending on the direction of movement the contacts act as disconnector or earthing switch maintenance earthing switch.
By means of a crank handle, manual operation of the combined disconnector and earthing switch is also possible. The optimization of the layout and the redundancy can be supported by LCC analysis which take into account the different reliability figures of the different technologies.
The goal is to achieve optimal availability of the substation with minimized costs. Optimizing of costs of ownership Cost of Ownership. The costs of ownership are dominated by the maintenance strategy and the reliability of the switchgear.
By means of LCC analysis, the different maintenance strategies can be simulated. Pure corrective maintenance can be compared with time-based or reliability — centered maintenance. Cost of Ownership Optimizing of renewal costs LCC calculations assist in determining the optimal date for replacing an existing substation.
Aged equipment requires intensified maintenance, more specialized experts and spare parts. The GIS in Germany is still in operation, whereas the GIS in Switzerland were recently decommissioned after 35 years of operation without major fault or gas leak.
An assessment made on SF6 gas leakage over the lifetime of the first GIS and concluded that overall leakage rate was about 0. Gas Insulated Substation Uploaded by Rajmohan. Flag for inappropriate content.
Related titles. Jump to Page. Search inside document. It is incombustible, non toxic, colorless and chemically inert. It has arc-quenching properties 3 to 4 times better than air at equal pressure. Table shows the dimensions, weight and floor loading for three voltage classes of GIS. Phase Clearance: Unlike a fuse, which operates once and then has to be replaced, a circuit breaker can be reset either manually or automatically to resume normal operation Current interruption in a high-voltage circuit-breaker is obtained by separating two contacts in a medium, such as SF6, having excellent dielectric and arc quenching properties.
A valve between the expansion and compression volumes. Voltage Measurement — Voltage Sensor instead of Voltage Transformer The voltage sensor is based on a capacitive electrical field sensor Capacitive ring sensor. Control cubicle 1.
Optimizing of costs of ownership Cost of Ownership The costs of ownership are dominated by the maintenance strategy and the reliability of the switchgear. Saurabh Manglik. MA Ahmed. Selvaraj Vaithilingam. Sreesankar Ks. Vipin Reddy Kandhakatla. Rahul Sharma. Praveen Kumar.
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