The auto reclosing of power lines has become a generally accepted practice. Reports from different parts of the world show that in certain networks in regions subject to a high lightning intensity only about 5 percent of the faults are permanent. Auto-reclosing, therefore, provides significant advantages. Outage times will be short compared with systems where station … [Read more...] about Auto Reclosing of Power Lines and Types of Faults
Power System
Square D QO Circuit Breakers
QO stands for Qwik-Open. Square D QO Circuit Breakers are fastest tripping circuit breakers at 1/60th of a second. QO™ Circuit Breakers provide the high level of protection you expect from Square D. When it comes to electrical protection, fast response is critical and QO™ Circuit Breakers can trip faster than the blink of an eye. The exclusive QO™ Visi-Trip™ instantly … [Read more...] about Square D QO Circuit Breakers
Bundled Conductors in Transmission Lines
Bundled conductors are commonly used to increase electrical capacity and reduce corona and radio noise at voltages above 200 kV. Though the extent of corona and radio noise is impacted by elevation (air density), and other factors such as conductor surface condition and moisture, the bundle dimensions are the primary factor in mitigating the onset of the corona. … [Read more...] about Bundled Conductors in Transmission Lines
Measurement of Three Phase Power | Wattmeter Methods
This article explains the measurement of three-phase power in star connected or delta connecter load using the wattmeter methods. The power in a three phase load can be measured by following methods: Three wattmeter method Two wattmeter method One wattmeter method The name of these methods indicates the number of wattmeters used in the measurement of … [Read more...] about Measurement of Three Phase Power | Wattmeter Methods
Types of Underground Cables
In practice, different types of underground cables are generally required to deliver 3-phase power. For the purpose, either three-core cable or three single core cables may be used. For voltages upto 66 kV, 3-core underground cable (i.e., multi-core construction) is preferred due to economic reasons. However, for voltages beyond 66 kV, 3-core-cables are not preferred because … [Read more...] about Types of Underground Cables