You are the engineer responsible for parameterizing the relay of a substation with a 500kVA transformer, transformation ratio of 13.8-0.38/0.22kV and impedance of 4.5%. The local network sent you a new equivalent impedance at the delivery point and the relay installed in the primary cabin activated function 50, disabling the medium voltage switch. Remembering that the primary cabin has a protective CT of 150:5A and TP with a transformation ratio of 13800/R3:115/R3 resulting in an RTP of 120:1. A) Calculate the symmetrical three-phase short circuit level in the primary cabinet to determine the current passing through the relay reading during a fault.
Power Amplifier
The power amplifier is an electronic amplifier designed to maximize the signal strength of a given input. The input signal strength is enhanced to a high enough level to drive output devices such as speakers, headphones, RF (Radio frequency) transmitters, etc. Unlike voltage / current amplifiers, the power amplifier is designed to drive core loads directly and is used as a storage block in the amplifier series.
Maximum Efficiency Criterion
In every field of engineering, there is a tremendous use of the machine and all those machines are equipped for their popular work efficiency so it very much important for operation engineers to monitor the efficiency of the machine, planning engineers to check out the efficiency of the machine before installing the machine and design engineers to design machine for higher efficiency than and then the utility will procure their products that will ultimately lead to profit and loss of the company. It indicates the importance of efficiency right from the initial stage as manufacturing units, intermediate stage as planning coordinators, and end-users stage as a utility.
You are the engineer responsible for parameterizing the relay of a substation with a 500kVA transformer, transformation ratio of 13.8-0.38/0.22kV and impedance of 4.5%. The local network sent you a new equivalent impedance at the delivery point and the relay installed in the primary cabin activated function 50, disabling the medium voltage switch. Remembering that the primary cabin has a protective CT of 150:5A and TP with a transformation ratio of 13800/R3:115/R3 resulting in an RTP of 120:1.
A) Calculate the symmetrical three-phase short circuit level in the primary cabinet to determine the current passing through the relay reading during a fault.
Calculate the symmetrical three-phase short circuit level in the primary cabinet to determine the current passing through the relay reading during a fault.
Give -
a 500kVA transformer, transformation ratio of 13.8-0.38/0.22kV and impedance of 4.5%. The local network sent you a new equivalent impedance at the delivery point and the relay installed in the primary cabin activated function 50, disabling the medium voltage switch. Remembering that the primary cabin has a protective CT of 150:5A and TP with a transformation ratio of 13800/R3:115/R3 resulting in an RTP of 120:1.
Step by step
Solved in 3 steps
