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EE 5223 - Lecture 14 Wed Feb 8, 2017
Ongoing List of Topics: • URL: http://www.ece.mtu.edu/faculty/bamork/EE5223/index.htm • Labs - EE5224 Lab 3 - begins on Tues Feb 14th• Term Project - details posted. Limit 1 BS student/team! • Exercises posted
Today: • Reclosing - radial vs. grid system• Short circuit protection in grid systems
• Directional overcurrent• Impedance
• Voltage & Current relationships during faults, §3.5-3.10• X/R ratio, dc offset, decay of dc offset • Relative angles and magnitudes of all Vs & Is during fault
• Basic connections of directional overcurrent (67) relays. • Phase relays - each line current is polarized with VLLfrom other phases.• Ground relay - residual current (3Iao) polarized with Vbroken delta (3Vao)
• Excellent Illustrations: figures 3.7 thru 3.10
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■OvercurrentProtectionProtect lines and equipment using a sensitive and secure mix of phase, negative-sequence, and ground overcurrent elements. Use directional control elements in looped systems. Provide high-speed operation, even with severe CT saturation, using SEL Adaptive Overcurrent Element. Apply “recloser” time-overcurrent curves for coordination with and sequencing of downstream reclosers.
■OperatorControlsandReclosingUse direct-action operator controls to eliminate the need for expensive, panel-mounted control switches and associated wiring. Integrate automation elements, including remote, local, and latch switches, plus display points, for remote and local control. Selectively reclose with synchronism and voltage checks.
■RelayandLogicSettingsSoftwareUse acSELErator® QuickSet™ SEL-5030 Software to reduce engineering costs for relay settings and logic programming. Use graphical tools included with acSELErator to develop SELogic® control equations.
■AccurateMeteringandMonitoringUse built-in, high-accuracy metering functions to eliminate expensive, separately mounted metering devices. Improve maintenance scheduling using circuit breaker contact wear and substation battery voltage monitors.
■SequentialEventsReportAnalyze Sequential Events Recorder (SER) and oscillographic event reports for rapid commissioning, testing, and post-fault diagnostics.
Making Electric Power Safer, More Reliable, and More Economical ®
Optimize Distribution Protection,Automation, and Breaker Control
SEL-351S Protection and Breaker Control Relay
Apply the SEL-351S Relay to
enhance your service quality
through integrated protection,
monitoring, and control.
Features and Benefits
Develop SELogic control equations using acSELErator Software.
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Use any of the 38 traditional recloser curves in the SEL-351S Relay to time-coordinate with downstream circuit reclosers. Sequence coordination keeps the SEL-351S in step with downstream reclosers and prevents tripping by overreaching overcurrent elements for faults beyond reclosers.
Five standard US and IEC time-overcurrent curves provide coordination with other time-overcurrent relays.
Functional Overview
Coordinate Overcurrent Protective Devices
• SELOGIC® Control Equations
• Event Reports
• Sequential Events Recorder
• Breaker Wear Monitor
• Station Battery Monitor
• DNP3 Level 2 Slave*
• High-Accuracy Metering
• MIRRORED BITS® Communications*
• Communications-Assisted Tripping
• Remote and Local Control Switches
• Wye or Delta Voltage Connection
• Local Display and Operator Controls
• Synchrophasor Measurements
• Load Profile*
• Fault Locator
• Fast SER Protocol
• Auxiliary Trip/Close Control*
• Voltage Sag/Swell/Interruption Records*
• User-Configurable Labels*
• Sensitive Earth Fault Protection and Directional Protection for Various System Grounding Practices*
27 81 OU59
PGQ
67PGQ
3232QVI
51PGQ
50PGQ
67N 51N50N
27 59
SEL-351S Relay
Bus
Feeder
79
25
3
3
1
1Breaker
52
* Optional Functions
Retrofit older existing reclosers with the SEL-351R Recloser Control.
t
I
FastCurves
DelayCurves
52
RECLOSER
SEL-351S SEL-351R
SEL-351S SEL-351R
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