Application And Setting Notes - Siemens 7SJ82 Manual

Blocking the Stage
In the event of blocking, the picked up stage will be reset. Blocking is possible externally or internally via the
binary input signal
6.23.4.2

Application and Setting Notes

Parameter: Method of measurement
•
Recommended setting value (_:8) Method of measurement = fundamental comp.
With the Method of measurement parameter, you define whether the tripping stage uses the fundamental
component (standard method = default setting) or the calculated RMS value.
Parameter Value
fundamental comp.
RMS value
Parameter: Measured value
•
Default setting (_:9) Measured value = phase-to-phase
With the Measured value parameter, you define whether the tripping stage monitors the phase-to-phase
voltages V , V
AB BC
Parameter Value
phase-to-phase
phase-to-ground
Parameter: Threshold, Pickup factor
•
Default setting (_:3) Threshold = 110.000 V
•
Default setting (_:101) Pickup factor = 1.10
The stage picks up when the measured voltage value exceeds the pickup value Threshold × Pickup
factor.
Depending on the Measured value, the Threshold is set either as phase-to-phase quantity or as phase-to-
ground quantity.
With the Pickup factor parameter, you modify the pickup value. To avoid a long-time operate delay after
pickup when the measured value is slightly over the threshold, Siemens recommends using the default
setting.
Specify the Threshold (pickup threshold) and Pickup factor for the specific application.
Parameter: Pickup mode
•
Recommended setting value (_:182:101) Pickup mode = 1 out of 3
With the Pickup mode parameter, you define whether the protection stage picks up if all 3 measuring
elements detect the overvoltage condition (3 out of 3) or if only 1 measuring element detects the over-
voltage condition (1 out of 3).
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
>Block stage .
Description
Select this method of measurement to suppress harmonics or transient
voltage peaks.
Siemens recommends this method of measurement as the default setting.
Select this method of measurement if you want the stage to take harmonics
into account (for example, at capacitor banks). Do not set the threshold
value of the tripping stage under 10 V for this method of measurement.
, and V or the phase-to-ground voltages V
CA
Description
If you want to monitor the voltage range, keep phase-to-phase as the
default setting. In this case, the function will not pick up on ground faults.
Siemens recommends the measured value phase-to-phase as the
default setting.
Select the phase-to-ground setting if you want to detect voltage unbal-
ances and overvoltage conditions caused by ground faults.
Protection and Automation Functions
6.23 Overvoltage Protection with 3-Phase Voltage
, V , and V .
A B C
701