IEC Current Transformer Accuracy Class
Current transformer (CT) accuracy class refers to how precisely a current transformer can replicate the primary current in its secondary winding, within certain tolerances, under defined conditions. CT accuracy is crucial because any deviation in the secondary current can impact the performance of metering devices and protection systems, leading to incorrect readings or faulty operation of protective relays.
Factors Affecting...
Cooling Methods of Power Transformers and Reference Standards
I. General
Transformers generate heat during operation, primarily due to the electrical losses in the windings and the core. To maintain efficiency and prevent damage, various cooling methods are employed. These cooling methods can be broadly categorized into natural and forced types, depending on the size and power rating of the transformer.II. Methods of Cooling
1. Oil-Immersed Transformer Cooling Methods
Oil-immersed transformers...
Kelvin’s Law and Minimum Conductor Size
What is Kelvin's Law?
Kelvin's Law, also known as Kelvin's Minimum Conductor Size Law, is a principle in Electrical Engineering to determine the optimal size of electrical conductors electrical power transmission systems. The law was proposed by Lord Kelvin (William Thomson) in 1881 as part of his work on optimizing the efficiency of power transmission systems, particularly during the early days...
Voltage Selection Guide for Electric Power Transmission Line as to Load and Distance
General
As Electrical Engineers, there will be a time in our professional careers that we will be tasks to perform options selections in transmission lines. We should be able to determine what factors we need to consider when considering the selection of voltages for transmission lines as per requirement of the loads supplied and the distance in which power will...
Selection of the Insulation Level for Power Cables
Insulation Level General Categories
Selection of the appropriate insulation level for power cables depends on the phase-to-phase voltage and two general categories shown below:- 100% Voltage Level.
- Cables in this category may be applied where the power system's protective relaying apparatus can clear a ground fault (an unintentional connection to ground of one or more current-carrying conductors) in less than 1...
