The following measures are applied to avoid unwanted tripping:
•
Correction of steady-state deviations from rated frequency
•
Frequency operating range limited to f
rated
± 3 Hz
•
High measuring accuracy by using frequency-tracked measured values and evaluation of the positive-
sequence phasor
•
Enabling the minimum voltage for the Vector-jump protection function
•
Blocking the function when the primary voltage is switched on or off as switching can lead to a phase-
angle jump
Logic
[lo_VJP_General, 1, en_US]
[lo_VJP_General_2, 1, en_US]
Figure 6-225 Logic Diagram of the General Functionality
Phase-Angle Calculation
The phase-angle differential is calculated at different time intervals (t-T, t-2T, t-3T) from the vector of the posi-
tive-sequence voltage via a delta-interval measurement. With the current measured power frequency, the
measuring errors of the angle measurement caused by frequency deviations are compensated.
Range
If the measured frequency or voltage is below the set threshold, the Vector-jump protection is blocked.
The voltage and frequency bands have the following limits:
•
The threshold of the voltage band is configurable.
•
The frequency band ranges is fixed from f
rated
- 3 Hz to f
rated
+ 3 Hz.
Measurand
The general functionality calculates the phase-angle displacement Δφ and sends it to the Δφ stage. Δφ is used
for comparison with the parameter Threshold Δφ. Δφ is displayed in the functional measured value and can
be routed in a fault record and displayed in the fault log.
Protection and Automation Functions
6.36 Vector-Jump Protection
SIPROTEC 5, Overcurrent Protection, Manual 793
C53000-G5040-C017-8, Edition 07.2017
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