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SINGLE
MODE FO
SDH AT FOX
PATULISS 615 AT
PARK
(MUX) CIR. SS
Fig 3: Architecture of Line Differential protection using IEEE C37.94
Patuli WORKING AUCKLAND Park
S/S PATH circus
KRS JAD CAL SOUTH S/S
EMSS NRO PARK
CIRCUS
AIRPORT
PRS
E.CAL
DUM-DUM B.T RD AMHERST ST
BACK-UP
PATH
Figure 4: Working path and back up path for line differential relay
Fig 4: Working path and back up path for line differential relay
RESULTS CONCLUSION
➤ Line differential relay communication was IEEE C37.94 based communication backbone can be
established between the two ABB make relays. deployed for protection system satisfactorily without
affecting its performance adversely. On the other hand,
➤ Operational performance for line differential relay implementing this in line differential protection adds
was found satisfactory. flexibility and redundancy to the communication channel
with dual paths with instant auto-switching facility in
➤ Operating time of line differential relay was found event of failure of a running path, greatly improving the
within 40 ms. overall reliability of the protection scheme.
➤ Transmission time delay, measured by line differential ACKNOWLEDGEMENT
relay was found to be 1.42 ms maximum when the
relays were connected with the working path. We would like to sincerely thank the Distribution
Automation team for their untiring support in completing
➤ Transmission time delay, measured by line differential the project. Their timely inputs during the course of
relay was found to be 1.82 ms maximum when the execution proved invaluable.
relays were connected through the Backup path.
We would also like to extend a word of gratitude to the
➤ Change over time delay between working path and System Control Department for their necessary support
back up path was also measured which was within in carrying out the activities whenever required.
25 ms.
Lastly a token of appreciation to all those who have
Similar results were also found for SEL make and SIEMENS been part of the project in any way for successfully
make line differential relays. implementing the project.
IMPLEMENTATION AND SCALABILITY The IEEE guidelines were our reference through the
overall project.
This standard has already been commissioned for Main-1
protection (SIEMENS make 7SD522 relay) for four 132kV
lines. Future plan is to implement this standard for Main-1
protection of all the 132kV and 220kV lines.
We will closely monitor the parameters of this standard if
possible, in future we may also use it for Main-2 protection.
72
MODE FO
SDH AT FOX
PATULISS 615 AT
PARK
(MUX) CIR. SS
Fig 3: Architecture of Line Differential protection using IEEE C37.94
Patuli WORKING AUCKLAND Park
S/S PATH circus
KRS JAD CAL SOUTH S/S
EMSS NRO PARK
CIRCUS
AIRPORT
PRS
E.CAL
DUM-DUM B.T RD AMHERST ST
BACK-UP
PATH
Figure 4: Working path and back up path for line differential relay
Fig 4: Working path and back up path for line differential relay
RESULTS CONCLUSION
➤ Line differential relay communication was IEEE C37.94 based communication backbone can be
established between the two ABB make relays. deployed for protection system satisfactorily without
affecting its performance adversely. On the other hand,
➤ Operational performance for line differential relay implementing this in line differential protection adds
was found satisfactory. flexibility and redundancy to the communication channel
with dual paths with instant auto-switching facility in
➤ Operating time of line differential relay was found event of failure of a running path, greatly improving the
within 40 ms. overall reliability of the protection scheme.
➤ Transmission time delay, measured by line differential ACKNOWLEDGEMENT
relay was found to be 1.42 ms maximum when the
relays were connected with the working path. We would like to sincerely thank the Distribution
Automation team for their untiring support in completing
➤ Transmission time delay, measured by line differential the project. Their timely inputs during the course of
relay was found to be 1.82 ms maximum when the execution proved invaluable.
relays were connected through the Backup path.
We would also like to extend a word of gratitude to the
➤ Change over time delay between working path and System Control Department for their necessary support
back up path was also measured which was within in carrying out the activities whenever required.
25 ms.
Lastly a token of appreciation to all those who have
Similar results were also found for SEL make and SIEMENS been part of the project in any way for successfully
make line differential relays. implementing the project.
IMPLEMENTATION AND SCALABILITY The IEEE guidelines were our reference through the
overall project.
This standard has already been commissioned for Main-1
protection (SIEMENS make 7SD522 relay) for four 132kV
lines. Future plan is to implement this standard for Main-1
protection of all the 132kV and 220kV lines.
We will closely monitor the parameters of this standard if
possible, in future we may also use it for Main-2 protection.
72
