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DifferentialFull description
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Testing the SEL-311L Line Current Differential Relay with ProTesT YAKOV KNOBEL Sr. APPLICATION ENGINEER DOBLE ENGINEERING COMPANY, USA.
SEL-311L Line Current Differential With Full Distance Backup 87L Restrain
87L Operate
SEL-311L
Zone 3
87L Restrain
SEL-311L
Zone 1 Zone 2 Zone 4
SEL 311L Line Current Differential Relay
Line Current Differential for Two or Three Terminal with Tapped Load Overcurrent
Backup Options from simple Overcurrent to Full 4 Zone Pilot Aided Distance
Protest Plan concentrates on 87 and Tapped Load O/C
See SEL 311C test plan for other element tests
Relays Include Test Aids
SEL 311L with Setting APP=87L Bus
87L
52
50
51
67
SEL 311L with Setting APP=311L Bus
87L
50
52 25/ 79
51
21/68
67
81
27/59
Line Current Differential Testing
Communications Channel is an Integral Component of the Protection
Testing at Local Terminal May Result in Tripping at Remote Terminal
Single and Multi- Ended Testing Methods are Available
Relays Include Test Aids
Single-Ended Testing
Each SEL-311L May Be Tested Independently
Remote 87L Must Be Blocked to Prevent Tripping
Built-in Features
Stub Bus Logic
Loop Back
Loop Back for Testing with One Relay
Simulates Internal Faults Only.
Differential Current Is 2 x Applied Test Current.
87L Pickup Is One Half of Setting Value.
Alpha Plane Will Always Plot at 1 @ 0 Degree.
Channel Loop Back
If the Channels Are Disconnected, 87L Is Blocked.
Relay Provides Internal and External Channel Loop Back.
Local 87L Is Enabled During Loop Back, Remote Is Disabled.
Hot-Standby Channel Must Be Disabled.
Internal Loop Back
Differential Current Is 2 x Applied Test Current. Available With All Channel Interfaces. No External Equipment Is Required.
External Loop Back
Differential Current Is 2 x Applied Test Current.
Available With All Channel Interfaces.
Fiber Channel May Be Jumpered at Rear of Relay, or at Any Patch Panel Between the Relays.
Multiplexed Channel Loop Back Provided by Equipment Manufacturer.
SEL 311L Differential Element The SEL-311L restraint characteristic • Surrounds the ideal external fault and load current point • Allows for errors in both magnitude and phase angle caused by CT saturation, channel asymmetry etc. • Is adjustable both in angular extent and radial reach.
SEL 311L Differential Element Operate Region
Operate Region
Channel Asymmetry Remote CT Source Saturation Impedances, Local CT Fault Location Saturation F1 F2 Remote CT Saturation Operate Region
Restraint Region
Local CT Saturation Operate Region
SEL-311L Metering
Local and Remote Currents
Phase, Zero Sequence, Negative Sequence, and Positive Sequence Currents
Difference Currents
Alpha Plane Radius and Angle Use as calibration and connection test
Meter Values – Proper CT Connections Local
A
B
C
I MAG (A Pri) 587.199 589.804 584.416 I ANG (DEG) Channel X
-0.20 -120.10 A
B
Vector Sum
179.50 A
59.90 B
6.590
5.432 587.139
C
3I0 7.787
3I0
3I2
11.490
10.793
I ANG (DEG)
148.90 -120.10 -104.20 -142.00
RADIUS ANG (DEG)
1.000 179.70
B
C
I1
5.726 587.858 100.70
6.043
A
4.400
0.00
3I2
-60.20 -175.50 C
I1
71.30
I MAG (A Pri)
Alpha Plane
6.188
3I2
120.10 -101.30
I MAG (A Pri) 592.394 583.617 587.570 I ANG (DEG)
3I0
179.70 I1 3.160
86.30
103.00
ZERO-SEQ NEG-SEQ POS-SEQ
0.980
1.000
0.000
0.000
179.90
179.60
0.00
0.00
1.000 179.70
Inrush Protection
Increases the minimum trip thresholds and slows the relay operation Active when relay it detects that local or remote breaker is open.
Defeated in test plan by setting the relay 52a logic to assert (52A = 1).
Otherwise use test set logic sources to simulate 52a
COM Report - Channel Information
=>>COM X SEL-311L 87L Date: 03/14/01 Time: 11:05:44.616 EXAMPLE: BUS B, BREAKER 3 FID=SEL-311L-X108-V0-Z001001-D20010312 CID=BA2B Summary for 87L Channel X Channel Status Alarms ROKX = 1 DBADX = 0 RBADX = 0 AVAX = 0 For 03/14/01 07:30:52.612 to 0 COMM. LOG SUMMARY COMM. STATISTICS # of Error records 33 Last error Data Error Data Error 17 Longest failure 0.005 sec. Dropout 16 Lost Packets, prev. 24 hours 81 Test Mode Entered One Way Delay (Ping-Pong) 0 msec. =>>
