Overview
The “Voltage dependent overcurrent protection” function detects short circuits affecting electric equipment. It can be used for special network conditions where the overcurrent pickup level should be decreased depending on the fault voltage, and for generators where the excitation voltage is derived from the machine terminals and the overcurrent pickup should be kept depending on the fault voltages.
For more detailed information on “Voltage dependent overcurrent protection” function, refer to SIPROTEC 5 devices, V8.30 & higher manuals.
To see other supported functions, click here.
Structure/Embedding of the Function
Setting Parameters
Setting parameters for Stage with Inverse-Time Overcurrent Protection, Voltage-Dependent
| Addr. | Parameter | C | Setting Options | Default Setting |
| V-dependent 1 | ||||
| _:11491:1 | V-dependent 1:Mode | off on test |
off | |
| _:11491:2 | V-dependent 1:Operate & flt.rec. blocked | no yes |
no | |
| _:11491:27 | V-dependent 1:Blk. w. inrush curr. detect. | no yes |
no | |
| _:11491:8 | V-dependent 1:Method of measurement | fundamental comp. RMS value |
fundamental comp. | |
| _:11491:3 | V-dependent 1:Threshold | 1 A @ 100 Irated | 0.030 A to 35.000 A | 1.500 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 7.50 A | ||
| 1 A @ 50 Irated | 0.030 A to 35.000 A | 1.500 A | ||
| 5 A @ 50 Irated | 0.15 A to 175.00 A | 7.50 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.500 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 7.500 A | ||
| _:11491:101 | V-dependent 1:Type of character. curve | |||
| _:11491:102 | V-dependent 1:Reset | instantaneous disk emulation |
disk emulation | |
| _:11491:103 | V-dependent 1:Time dial | 0.05 to 15.00 | 1.00 | |
Setting parameters for Stage with Inverse-Time Overcurrent Protection, Voltage-Released
| Addr. | Parameter | C | Setting Options | Default Setting |
| V-release # | ||||
| _:1 | V-release #:Mode | off on test |
off | |
| _:2 | V-release #:Operate & flt.rec. blocked | no yes |
no | |
| _:10 | V-release #:Blk. by meas.-volt. failure | no yes |
yes | |
| _:27 | V-release #:Blk. w. inrush curr. detect. | no yes |
no | |
| _:8 | V-release #:Method of measurement | fundamental comp. RMS value |
fundamental comp. | |
| _:3 | V-release #:Threshold | 1 A @ 100 Irated | 0.030 A to 35.000 A | 1.500 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 7.50 A | ||
| 1 A @ 50 Irated | 0.030 A to 35.000 A | 1.500 A | ||
| 5 A @ 50 Irated | 0.15 A to 175.00 A | 7.50 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.500 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 7.500 A | ||
| _:101 | V-release #:Type of char- acter. curve | ANSI long-time inv. ANSI short-time inv. ANSI extremely inv. ANSI very inverse ANSI normal inverse ANSI moderately inv. ANSI definite inverse IEC normal inverse IEC very inverse IEC extremely inv. IEC long-time inverse |
IEC normal inverse | |
| _:102 | V-release #:Reset | instantaneous disk emulation |
disk emulation | |
| _:103 | V-release #:Time dial | 0.05 to 15.00 | 1.00 | |
| _:104 | V-release #:Under- voltage threshold | 0.300 V to 175.000 V | 75.000 V | |
Setting parameters for Stage with Definite-Time Overcurrent Protection, Undervoltage Seal-In
| Addr. | Parameter | C | Setting Options | Default Setting |
| V-seal-in 1 | ||||
| _:16951:1 | V-seal-in 1:Mode | off on test |
off | |
| _:16951:2 | V-seal-in 1:Operate & flt.rec. blocked | no yes |
no | |
| _:16951:3 | V-seal-in 1:Threshold | 1 A @ 100 Irated | 0.030 A to 35.000 A | 1.350 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 6.75 A | ||
| 1 A @ 50 Irated | 0.030 A to 35.000 A | 1.350 A | ||
| 5 A @ 50 Irated | 0.15 A to 175.00 A | 6.75 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.350 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 6.750 A | ||
| _:16951:6 | V-seal-in 1:Operate delay | 0.00 s to 60.00 s | 3.00 s | |
| _:16951:10 | V-seal-in 1:Blk. by meas.- volt. failure | no yes |
yes | |
| _:16951:101 | V-seal-in 1:State of V- seal-in | off on |
off | |
| _:16951:102 | V-seal-in 1:V-seal-in threshold | 0.300 V to 175.000 V | 46.200 V | |
| _:16951:104 | V-seal-in 1:Duration of V- seal-in time | 0.10 s to 60.00 s | 4.00 s | |
Setting parameters for Stage with Definite-Time Overcurrent Protection, Voltage-Released Undervoltage Seal-In
| Addr. | Parameter | C | Setting Options | Default Setting |
| Vseal-in+Vrel# | ||||
| _:1 | Vseal-in+Vrel#:Mode | off on test |
off | |
| _:2 | Vseal-in+Vrel#:Operate & flt.rec. blocked | no yes |
no | |
| _:3 | Vseal-in+Vrel#:Threshold | 1 A @ 100 Irated | 0.030 A to 35.000 A | 1.350 A |
| 5 A @ 100 Irated | 0.150 A to 175.000 A | 6.750 A | ||
| 1 A @ 50 Irated | 0.030 A to 35.000 A | 1.350 A | ||
| 5 A @ 50 Irated | 0.150 A to 175.000 A | 6.750 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.350 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 6.750 A | ||
| _:6 | Vseal-in+Vrel#:Operate delay | 0.00 s to 60.00 s | 3.00 s | |
| _:10 | Vseal-in+Vrel#:Blk. by meas.-volt. failure | no yes |
yes | |
| _:101 | Vseal-in+Vrel#:State of V-seal-in | off on |
off | |
| _:102 | Vseal-in+Vrel#:V-seal-in threshold | 0.300 V to 175.000 V | 46.200 V | |
| _:104 | Vseal-in+Vrel#:Duration of V-seal-in time | 0.10 s to 60.00 s | 4.00 s | |
| _:105 | Vseal-in+Vrel#:Vph-ph< threshold | 0.300 V to 175.000 V | 60.000 V | |
| _:106 | Vseal-in+Vrel#:V2> threshold | 0.300 V to 200.000 V | 4.600 V | |
Logic Diagrams & highlights
Logic Diagram of the Inverse-Time Overcurrent Protection, Voltage-Dependent
Voltage Influence of the Pickup Threshold
Controlling Voltages in Relation to the Fault Current
Logic Diagram of the Inverse-Time Overcurrent Protection, Voltage-Released
Logic Diagram of the Definite-Time Overcurrent Protection, Undervoltage Seal-in
Logic Diagram of the Definite-Time Overcurrent Protection, Voltage-Released Undervoltage Seal-in, Part 1
Logic Diagram of the Definite-Time Overcurrent Protection, Voltage-Released Undervoltage Seal-in, Part 2
