18-09-2014, 12:47 PM
A NEW SIMPLIFIED FAULT LOCATION ALGORITHM FOR SERIES COMPENSATED TRANSMISSION LINES PROJECT REPORT
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Abstract
This paper presents a new simple fault location algorithm based on measurement of phasor quantities
for a two end series compensated transmission lines. The algorithm is developed using linerised model
of 3 phase capacitor banks to represent the effects of compensation. Basically, the algorithm uses
current and voltage measurements from both ends of the transmission network and accurately
estimates the location and the resistance of the fault. The accuracy of the fault location is tested using
two-end 300km, 400KV, 3-phase transmission network, modeled using MALAB 6.1 recently
developed Power System Block set [1]. The algorithm was implemented using MATLAB
programming scripts [1]. The proposed techniques can be easily expanded to adapt multi line, multi
end un-transposed transmission lines
INTRODUCTION
Transmission of power generated from power plants to
consumers have been vastly improved and expanded to
every corner of the world during the last two decades.
Recent development of series compensation in power
systems can greatly increase power transfer capability,
damp power oscillations (if carefully designed) and
improve the transient stability.
NETWORK CONFIGURATION
ZLss = SSaa = SSbb = SScc Fig (1) illustrates a single line diagram of basic two
ends transmission network with series compensation
unit (SCU), which comprises of a capacitor( C ) and
Metal Oxide Varistor (MOV) located at the center of
the line. The network is powered from voltage sources
EA and EB connected to each end of the network. It is
assumed that a fault occurs at point F1, distance x from
station A, in front of SCU.
CONCLUTIONS
The algorithm presented in this paper is accurate and
simple to implement as a fault locator to find the
location of faults on series compensated transmission
lines. Since the fault locator has the instant data of
sources A and B, source impedances can be calculated
on-line, which eliminates source mismatches
substantially.
Faults may occur in front or behind the SCU, the
algorithm can produce results in a very short time, and
with similar accuracy to locators, which operate from
data derived from one end. The proposed algorithm can
be easily applied to any other type of transmission lines
(multi-lines and multi-ends). The inclusion of shunt
compensation in the algorithm developed in this paper
is in progress.