Transient Recovery Voltage of Generator Circuit Breaker 1

version 1.0.0 (53 KB) by Pulak Mukerjee
Part 1: Transient Recovery Voltage Simulation of medium voltage Generator Circuit Breaker during Generator Source Fault

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Updated 21 May 2022

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In a typical generating station, a medium voltage generator is connected to the medium voltage terminals of the generator transformer (T1) via three (3) single phase medium voltage generator circuit breakers (GCB) and isolated phase buses (IPB). One side of the GCB is connected to the generator terminals and the other side to the medium voltage terminals of T1. The high voltage terminals of T1 are connected to the high voltage transmission line. The other end of the transmission line is connected to the high voltage transmission substation.
Transient recovery voltage (TRV) for the GCB is the voltage that appears across the terminals of GCB after interruption of the fault current. TRV is a critical parameter for fault current interruption by the GCB. Inadequate TRV rating of GCB may cause failure to interrupt the fault current. TRV study is carried out to ensure that the GCB is capable of interrupting fault current safely and prevent damage to vital equipment/ personnel in the generating station. TRV parameter is usually included in the procurement specification of the GCB.
Generator source fault (GSF) TRV is generated when the GCB interrupts the fault current, occurring due to a fault between the GCB and the transformer (T1).
Based on the Single Line Diagram of the generating station, a system block diagram is prepared using Specialized Power System subsection of Simscape Electrical section. The block diagram includes the equivalent resistance, inductance and capacitance on either side of the GCB. The block diagram also includes resistane, inductance and capacitance of the high voltage system.
A simulation is carried out and TRV measured in a scope. The phase having highest TRV is selected for signal processing. The other phases were no longer displayed. The first pulse is isolated by zooming on the time axis. The peak value of the pulse is noted. The scope data was logged to the workspace. The scope data was plotted from the workspace. The selected phase data was exported to an excel file. The TRV was replotted in excel. The maximum peak value of the TRV was added. A tangent to the upper part of TRV passing through the origin was added. From the point of intersection of the tangent with the maximum value of TRV, a vertical line was added to find out the time to peak. Another tangent was added to the lower part of the TRV curve to find out the time delay. The rate of rise of recovery voltage is computed. The simulation results are indicated in the model.

Cite As

Pulak Mukerjee (2022). Transient Recovery Voltage of Generator Circuit Breaker 1 (https://www.mathworks.com/matlabcentral/fileexchange/111955-transient-recovery-voltage-of-generator-circuit-breaker-1), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2019b
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