EXPERT SYSTEM FOR TRANSMISSION LINE LIGHTNING PERFORMANCE DETERMINATION
COLLOQUIUM
Power Quality and Lightning Sarajevo, Bosnia and Herzegovina, 13 - 16 May, 2012
LIGHTNING PERFORMANCE DETERMINATION
T. Sadovi, S. Sadovi, O. Hadi, V. Panti
CENTRAL SERVER
I3CM1LLS I3CMi I3CMN
User1 Userj UserM
sigma slp &
EMTP_RV
SYSTEM CONCEPT
LLS - Lightning Location System
I3CM - Real time remote transient recorder
Sigma slp - Software for determination of transmission and distribution line lightning performance
EMTP_RV ElectroMagnetic Transient Program Restructured Version
As soon as one or more transient recorders capture transients in the system (three phase voltages and currents transients ) these data with GPS time stamp is immediately transferred to the central server.
After reception of the captured transients central server is searching for the real time data for the lightning activity obtained from the Lightning Location System (data which also has accurate GPS time stamp). Comparing GPS times for both data set, server detects if power system disturbance is generated or not by the fault produced by lightning stroke.
FUNCTION
disturbance is generated or not by the fault produced by lightning stroke.
If disturbance is generated by lightning this information is immediately transferred to the user with automatic geographical display of the stroke location and peak current. Stroke data is displayed on the map of the region with the display of the OHL routes.
Position of the I3CM controllers is displayed on the same map. I3CM controllers detecting transients are highlighted.
User can click on the controller position to get shapes of the voltage and current recorded by the corresponding controller
INFO FROM TRANSIENT RECORDERS
If fault is caused by lightning stroke or not
Type of the fault
Conductors on which flashover has happened
Pre-fault voltages on different conductors
Direction of the fault currents
Short circuit currents, fault duration, if reclosing is successful or not,
Monitor power quality
Develop appropriate maintenance strategy
I3CM controller
GPS3G
WiFi
I3CM CONTROLER
4 channels
A/D card
I3CM CONNECTION
Central Server
ISO B&H
ETFS ServerWiFi
Internet
SarajevoOHL TR-DU OHL TR-HN
SYSTEM ARCHITECTURE
Relay and Measurement
building
Local Control building
Utility Intranet
WiFiLINET Server
Internet
Trebinje
2 x I3CM
110 kV OHL TR_HN
110 kV OHL TR_DU
TR SS
I3CM
DU
MINITORED LINES
110 kV OHL TR_HN
HN
110 kV OHL TR_DU 110 kV OHL TR_HN
220 kV OHL TR_HET
I3CM
TREBINJE 400 kV / 220 kV /110 kV Substation
220 kV OHL TR_HET
WiFi
Date Time Latitude Longitude Peak (kA Type 20120203 19:55:04.7642546 42.6551 18.2086 -22.6 CG
LINET Record
CASE 1 - STROKE TO THE MONITORED LINE
T47 Backflashover
CASE 1 - STROKE TO THE MONITORED LINE
T47 Backflashover
220 kV OHL TR_HET
Date Time Latitude Longitude Peak (kA Type 20120203 18:38:09.6825273 42.6835 18.3502 -74.7 CG
LINET Record
CASE 2 - STROKE TO THE NON - MONITORED LINE
TR SS
110 kV OHL TR_DU
110 kV OHL TR_HN
220 kV OHL TR_HET
CASE 2 - STROKE TO THE NON - MONITORED LINE
Conclusions1. By the real time comparison of the Lightning Location System data and data
received from the real time transient recorders it is possible to develop very powerful power system monitoring technology.
2. Using developed system, lightning performance of the particular line is automatically determined. It is possible to easily determine lightning performance of the different line sections. This information help us to undertake corresponding measures, like:Tower footing resistance improvementsInstallation of Line surge arrestersInstallation of Line surge arrestersInstallation of the additional shield or under built ground wires
3. Those measures are focused on the bad performing line sections only, which can lead to the substantial amount of money saving.
4. Proposed system can be used also as real time lightning caused fault locator (one span accuracy).
5. According to the available data obtained by the proposed system user can easily extract information needed to perform the corresponding software simulation by sigma slp or EMTP_RV software.
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