Schweitzer Engineering Laboratories SEL-311L, Instruction Manual, Page: 22 / 734

1-14 Introduction and Specifications Date Code 20011112
SEL-311L Instruction Manual
Relay Element Settings Ranges and Accuracies
Line Current Differential (87L) Elements
87L Enable Levels (Difference or Total Current)
Phase Setting Range: OFF, 1.00 to 10.00 A, 0.01 A steps
Neg.-Seq. Setting Range: OFF, 0.50 to 5.00 A, 0.01 A steps
Zero-Seq. Setting Range: OFF, 0.50 to 5.00 A, 0.01 A steps
Accuracy: ±3% ±0.01 Inom
Restraint Characteristic
Outer Radius
Radius Range: 2 to 8 in steps of 0.1 (unitless).
Angle Range: 90–270° in steps of 1°
Accuracy: ±5% of radius setting
±3° of angle setting
Operate Time (for bolted fault): See operate time curves in Figure 3.6 and Figure 3.7.
(Refer to Line Current Differential Elements in Section 3: Line Current Differential, Distance, Out-of-
Step, Overcurrent, Voltage, Synchronism Check, and Frequency Elements for the definition of terms and
terminology listed above.)
Difference Current Alarm Setting
Setting Range: OFF, 0.5 to 10.0 A, 0.1 A steps
Accuracy: ±3% ±0.01 Inom
Metering Accuracy
Voltages V
A
, V
B
, V
C
, V
S
: ±0.67 V secondary
Currents
I
A
, I
B
, I
C
, I
P
(Local):
I
A
, I
B
, I
C
, 3I
2
, 3I
0
, I
1
(Remote):
I
A
, I
B
, I
C
, 3I
2
, 3I
0
, I
1
(Total):
±0.05 A secondary (5 A nominal)
±0.01 A secondary (1 A nominal)
±3%
±3%
Substation Battery Voltage Monitor Specifications
Pickup Range: 20–300 Vdc, 1 Vdc steps
Pickup Accuracy: ±2% of setting