Sef3/Sef4 Sensitive Earth Fault Protection Scheme Logic For Models 820 And 821 - Toshiba GRE110 Instruction Manual

69
SEF3
[SE3-2F]
+ "Block"
&
ICD
SEF3
INST
ZPF
&
ZPR
&
"ON"
[ZPEN]
"OFF"
+
"FWD"
[SE3 DIR]
"REV"
"NON"
+
Figure 2.3.10 SEF3 Sensitive Earth Fault Protection Scheme Logic for models 820 and 821
70
SEF4
[SE4-2F]
+ "Block"
&
ICD
SEF4
INST
ZPF
&
ZPR
&
"ON"
[ZPEN]
"OFF"
+
"FWD"
[SE4 DIR]
"REV"
"NON"
+
Figure 2.3.11 SEF4 Sensitive Earth Fault Protection Scheme Logic for models 820 and 821
Setting
The table below shows the setting elements necessary for the sensitive earth fault protection for
models 820 and 821 and their setting ranges.
Element Range
SEFCT 1 - 20000
SEθ −95° – 95°
SEV 0.5 – 100.0
SE1 0.001 – 1.000 A
TSE1 0.00 – 300.00 s
TSE1M 0.010 – 1.500
TSE1R 0.0 – 300.0 s
TSE1RM 0.010 – 1.500
[SE3EN]
+
"ON"
≥1
&
≥1
≥1
&
[SE4EN]
+
"ON"
≥1
&
≥1
≥1
&
Step
1
1°
0.1 V
0.001 A
0.01 s
0.001
0.1 s
0.001
 32 
TSE3
t
&
0.00 - 300.00s
&
TSE4
t
&
0.00 - 300.00s
&
Default Remarks
150 CT ratio for SEFCT
SEF characteristic angle
0°
3.0V SEF ZPS voltage level
0.005 A SEF1 threshold setting
0.00 s SEF1 definite time setting. Required if
[MSE1] = D.
1.000 SEF1 inverse time multiplier setting.
Required if [MSE1] = IEC, IEEE or US.
0.0 s SEF1 definite time delayed reset. Required
if [MSE1] = IEC or [SE1R] = DEF.
1.000 SEF1 dependent time delayed reset time
multiplier. Required if [SE1R] = DEP.
6 F 2 T 0 1 7 2
0
≥1 124
SEF3 TRIP
0
≥1 125
SEF4_ALARM