Siemens SIPROTEC 4 7SD80

87 Differential Protection
The following tables provide an overview of the parameters and information of the functions:
- Phase comparison protection
- Ground current differential protection in grounded systems
- ground fault differential protection in resonant-grounded/isolated systems
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
The table indicates region-specific default settings. Column C (configuration) indicates the corresponding
secondary nominal current of the current transformer.
Addr. Parameter C Setting Options Default Setting Comments
1201 87L PCC-Prot. OFF
ON
ON Phase current comparison
protection
1202 87L Idyn> 1A 0.20 .. 20.00 A; ∞ 0.33 A Dynamic trip threshold
5A 1.00 .. 100.00 A; ∞ 1.65 A
1203 87L Idyn close> 1A 0.20 .. 20.00 A; ∞ 0.33 A Dynamic trip threshold line
closure
5A 1.00 .. 100.00 A; ∞ 1.65 A
1204 87L Isteady> 1A 0.50 .. 20.00 A; ∞ 1.33 A Steady pick up threshold
5A 2.50 .. 100.00 A; ∞ 6.65 A
1205 87L I min 1A 0.10 .. 20.00 A; ∞ 1.00 A Minimal phase current
5A 0.50 .. 100.00 A; ∞ 5.00 A
1206 87L Trip Delay 0.00 .. 0.10 sec 0.00 sec Trip Delay
1207 87L Man. Close DELAYED
UNDELAYED
DELAYED Trip response after manual
close
1208 87L: T EFdetect 0.00 .. 32.00 sec 0.00 sec Evolving fault detect.time
1ph faults
1214 87L:Inrush blk. NO
YES
NO Inrush blocking
1221 87N L: Protect. OFF
ON
Alarm Only
ON 87N L protection
1222 87N L: I-DIFF> 1A 0.10 .. 20.00 A 0.30 A 3I0-DIFF> Pickup value
5A 0.50 .. 100.00 A 1.50 A
1223 87NL:I-DIF>S.ON 1A 0.10 .. 20.00 A 0.30 A 3I0-DIFF> Value under
switch on condit.
5A 0.50 .. 100.00 A 1.50 A
1224A 87N L: T-DELAY 0.00 .. 300.00 sec; ∞ 0.00 sec 3I0-DIFF Trip time delay
1225A 87N L: I>RELEAS 1A 0.00 .. 20.00 A 0.00 A Min.current to release 3I0-
DIFF-Trip
5A 0.00 .. 100.00 A 0.00 A
1226 87N L: 3V0> 5 .. 150 V 50 V 3V0> pickup
1227 87N L:Vph-g min 10 .. 100 V 40 V Vph-g min of faulted phase
1228 87N L:Vph-g max 10 .. 100 V 75 V Vph-g max of healthy
phases
1229 87N L: 3I0> 0.003 .. 1.000 A 0.050 A 3I0> to release directional
element
1230 87N L:TD-F.det. 0.00 .. 320.00 sec 1.00 sec Time delay for fault detec-
tion
1231 87N L:TripDelay 0.00 .. 320.00 sec 0.00 sec Trip Delay
2.2.6
2.2.6.1
Functions
2.2 Phase Comparison Protection and Ground Differential Protection
SIPROTEC 4, 7SD80, Manual 63
E50417-G1100-C474-A2, Edition 02.2018