Transcript ANALYSIS OF THE PLC SYSTEMS FOR JEBBA-SHIRORO TRANSMISSION.ppt

ANALYSIS OF THE PLC SYSTEMS FOR
JEBBA-SHIRORO TRANSMISSION LINE
1A.
Abdulkarim & 2Y.A. Adediran
Department. Of Electrical & Electronics
Engineering
University of Ilorin, Ilorin
[email protected]
[email protected]
1
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
INTRODUCTION
Power line communication (PLC):
 a communication network technology
 using pre-installed power lines which provide
the electricity to the household or the building
 used to provide services such as Internet
access, automatic meter reading (AMR) and
home networking
2
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
INTRODUCTION
PLC technology could
 let the power transmission companies open
lucrative revenue streams,
–
–
3
by integrating electricity supply with broadband
telecommunication access
by providing high speed and reliable
communication traffic including Internet access
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
INTRODUCTION
PLC’s other applications:
 both industrial control and home automation over
power lines with economical and reliable solutions
 long-distance monitoring of alarms and airconditioning systems,
 comfortable control of intelligent household
appliances, and
 off-site reading of electricity meters via the power
grid
4
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
INTRODUCTION
Aim of paper:
 Reliability analysis of PLC systems
connected to the Jebba-Shiroro transmission
line.
Reliability: probability that a device or system
will perform its prescribed function
adequately, for the period of time intended,
under specified operating conditions.
5
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
Phase-to-Earth Coupling Circuits



6
PHCN uses Phase-to-Earth Coupling Circuits
as one of the media of communication
between different parts of the grid
series reliability block diagram (RBD)
assumed as failure of any component in
system leads to total system failure
Relevant failure data obtained from NCC,
Oshogbo
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
Phase-to-Earth Coupling
7

The general reliability of the power line
communication phase-to-earth coupling circuit is
given by

Subscripts:
RT=receiver/transmitter unit, CO=coax cable unit,
MX=matching transformer, CF= coupling filter,
CC=coupling capacitor, PU=protection unit, LT=line
trap, XL=transmission line
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
Phase-to-Earth Coupling

Substituting the components` failure rates,
the general reliability equation of the power
line communication phase-to-earth coupling
circuit is
λ=failure rate, t=operating time
8
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
Phase-to-Earth Coupling
Jebba-Shiroro 330 kV network reliability plot:
Jebba-Shiroro Network
Expected System Reliability
Present System Reliability
1.0
0.9
0.8
Reliability
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
8760 17520 26280 35040 43800 52560 61320 70080 78840 87600 96360
Time (hours)
9
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
PLC Contribution to the Communication
Network Failure


10
PHCN uses other means of communication
apart from PLC; these include: GSM, Fibre
optics and VSAT
But, PLC is the major means of
communication with different parts in the
Nigerian grid
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
PLC Contribution to the Communication
Network Failure
PLC Contribution to Communication Network Failures
% Failures
80
60
40
20
0
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
Time (years)
11
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
PLC Contribution to the Communication
Network Failure



12
2000-2006:decrease in %-age of PLC contribution to
communication systems’ failures due to introduction
of other communication media like GSM and NITEL
2006-2009: rapid increase as a result of NITEL
problem which makes PLC to contribute the highest
to system failure
2009: recorded highest communication network
percentage failure b/c the PLC network was
upgraded by removing some aged equipment such
as the line trap unit that had been in operation since
1976, thus the decrease observed in year 2010.
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
COMPONENTS’ IMPORTANCE
ANALYSIS (CIA)
Purpose:
 to identify the weakness(es) in a system and to quantify
the impact of component failures
 to identify the components that should be modified,
improved, or replaced with higher quality ones
 indicates the improvement of the system reliability when
the component under consideration has been replaced by
a perfect component.
 results therefrom are key contributors to the system
design, tuning, and maintenance activities
13
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
Components’ Importance Analysis (CIA)
Birnbaum’s component importance used:
= reliability importance of the k-th component for
B-th coupling circuit. RS(t) and FS (t) are the system
reliability and unreliability respectively at time t
14
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
Components’ Importance Analysis (CIA)
15
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
Components’ Importance Analysis (CIA)
Observations:
–
–
–
–
16
protection unit has the highest reliability
importance
i.e. the protection unit has the highest influence
on the system reliability;
it contributes most to system failure;
transmitter/receiver unit, coaxial cable, coupling
capacitor units, matching transmitter and line trap
follow in that order.
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
CONCLUSION AND
RECOMMENDATIONS



17
Reliability figures for the phase-to-earth
coupling connected to the Nigerian grid for
the last 11 years are very low when
compared to the expected reliability figures
obtained using RBD model.
transmission line distance has little effect on
the reliability figures of the PLC system
most of transmission line failures are as a
result of vandalism.
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
Conclusion and Recommendations


18
most of the PLC network failures are from the
protection unit and the receiver/transmitter
unit during the 11 years under investigation
It is therefore recommended that these units
should more often be replaced and with
higher reliability components for increased
availability of the overall system
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011
THANK YOU ALL
19
NSE Industrial Division Intn'l Conf.
& AGM, Lagos, 4-6 October 2011