Powerlines
Feature Article:
Protection
of a 230 kV Line Using Both Conventional & Optical
CT Inputs at Arizona Public Service
Arizona Public Service (APS) has
installed a 3-phase 230 kV NXVCT & an L-PRO Line
Protection Relay at Deer Valley Substation in
Phoenix. APS was initially attracted to the NXVCT
due to safety advantages (no oil or SF6 gas).
This installation tests the performance of the
NXVCT for protection applications, by using the
unique ability of the L-PRO to accept & operate
on both optical signals & conventional signals.
The NXVCT & the L-PRO both performed correctly
during an actual severe fault event.
Expanded
I/O: L-PRO Line Protection Relay
The L-PRO provides comprehensive distance based
transmission line protection, fault oscillography,
dynamic swing recording & event logging with
one integrated technology.
Protection
Four zones of Phase & Ground distance functions
& communications based schemes. Shapeable
mho characteristics are available for Phase elements
while the Ground elements have shapeable Mho or
Quadrilateral characteristics available.
Protection functions include IEEE devices, 21P,
21N, 25C, 27, 50BF, 50LS, 50/51/67, 50N/51N/67,
46/50/51/67, 59, 60, 68, 79, 81, Dead Line Pickup
& Weak Infeed.
1.0 to 1.3 cycle operation at 80% reach, ideal
for transmission line applications.
Ring bus capability allows breaker failure &
individual breaker operation analysis.
Four shot recloser with line/dead bus control
& syc check
CCVT compensation
ProLogic
- 12control logic statements.
Integrated breaker failure protection for ring
bus applications. Application Note (PDF, 98Kb)
8 setting groups with setting group logic
Optional expanded I/O, up to 20 external inputs
& 21 outputs
Recording, Monitoring
& Metering
High quality recording
- fault recording (96 samples/cycle), trend
& event logging (1 ms resolution).
Fault location - information provided by event
log access or analog input point for SCADA
Breaker monitoring
Metering functions for each input connection
Substation Automation
- Ethernet Ready
Direct-connect DNP3 & Modbus SCADA communication
protocols
3 communication RS-232 ports
IRIG-B time stamping & sample synchronization
30 virtual inputs for local & remote control
Easy To Use
User-friendly relay setting & record analysis
software (Windows? 9x/ME/NT/2000)
Intuitive ASCII-terminal
interface provides full local or
remote access.
Technical Papers
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