Surge Arrester: Zinc oxide surge arrester elements suitable for immersion in SF6 are supported by an insulating cylinder inside a GIS enclosure section to make a surge arrester for overvoltage. Because the GIS conductors are inside in a grounded metal enclosure, the only way for lightning impulse voltages to enter is through the connections of the GIS to the rest of the electrical system. Cable and direct transformer connections are not subject to lightning strikes, so only at SF6-to-air bushing Read More …
Bus and Air, Cable, Direct Transformer Connection For GIS
Bus: To connect GIS modules that are not directly connected to each other, an SF6 bus consisting of an inner conductor and outer enclosure is used. Support insulators, sliding electrical contacts, and flanged enclosure joints are usually the same as for the GIS modules. Air Connection: SF6-to-air bushings are made by attaching a hollow insulating cylinder to a flange on the end of a GIS enclosure. The insulating cylinder contains pressurized SF6 on the inside and is suitable for exposure Read More …
Circuit Breaker, Current And Voltage Transformers, Disconnect And Ground Switches For GIS
Circuit Breaker: GIS uses essentially the same dead tank SF6 puffer circuit breakers used in AIS. Instead of SF6 -to-air as connections into the substation as a whole, the nozzles on the circuit breaker enclosure are directly connected to the adjacent GIS module. Current Transformers: CTs are inductive ring types installed either inside the GIS enclosure or outside the GIS enclosure. The GIS conductor is the single turn primary for the CT. CTs inside the enclosure must be shielded from Read More …
Construction and Service Life of GIS Substation
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. A cross-section view of a 242-kV GIS shows the construction and typical dimensions. Construction of GIS Substation: The modules are joined using bolted flanges with an “O” ring seal system for the enclosure and a sliding plug-in contact for the Read More …
Ten Crazy Trends In The Smart Home Industry
Smart home technology is sweeping across the nation as rapidly as a field fire. Not only that, it is changing the world at the same time. Here are 10 trends in the smart home industry making a huge impact on people’s lives!. 1. Demand For Voice Control 72% of smart home device owners want voice control capability. It’s one of the easiest ways to automate a home. But voice control capability comes at a high price. Interestingly enough this demand Read More …
GIS – Gas Insulated Substations
A gas-insulated substation (GIS) uses a superior dielectric gas, SF6, at moderate pressure for phase-to-phase and phase-to ground insulation. The high voltage conductors, circuit breaker interrupters, switches, current transformers, and voltage transformers are in SF6 gas inside grounded metal enclosures. The atmospheric air insulation used in a conventional, air-insulated substation (AIS) requires meters of air insulation to do what SF6 can do in centimeters. GIS can therefore be smaller than AIS by up to a factor of 10. A GIS Read More …
Busbar VS Cables for Riser Applications
We already know the using busbar in the power distribution system has many advantages. It is well arranged, safe and reliable. I already posted an article about the Why Busbar Trunking System is Preferred Over Cabling? In this post, we will discuss the Busbar VS Cables for Riser Applications. We will discuss some issue and it will explain the position of using busbar and cable for riser application Main Switchboard Busbar: Need only 1 outgoing for each riser. Lower cost and Read More …
Why Busbar Trunking System is Preferred Over Cabling
Benefits and comparison of Busbar Trunking System are numerous. The total cost of ownership (TCO) is very low compared to conventional cabling system for distribution up to load due to a shorter and easier installation. It required less time & space with low costs. Its overall maintenance is very less. Busbar Benefits and Comparison: Compactness: The Sandwich Construction renders the BBT system more compact than air insulated bus bar system. For this reason, BBT is a preferred choice in the Read More …
8 Smart Home Devices for Energy Savings
Sometimes our monthly utility bill causes our heart working overtime. It’s a common problem for all around the country. One thing is important that your utility company is not cheating on you. It’s you who is not saving electricity. In this post, we are going to provide you 8 smart home devices idea with an approximate cost that can save your energy. 8 Smart Home Devices for Energy Savings: There are many different ways to cut your energy bills down Read More …
Winter Preparation for Your Standby Generator
Yes, winter is coming! That means heavy snow and ice storms can cause loss of electricity in this winter season like previous. Now my question is, is your backup generator up to the task? For getting uninterrupted electricity, your generators should properly maintain and carefully inspected before the winter. In this article, I am going to discuss all the Winter Preparation for Your Standby Generator. Generator Spend Hard Time in Cold Weather: Sometimes it’s really hard to start an engine Read More …