[dw_load loss, 1, en_US]
Figure 6-223 Voltage Vector of the Steady State
The following figure shows the situations after the load is switched off:
•
The terminal voltage V changes to V'.
•
An additional phase-angle jump occurs.
A phase-angle jump occurs with load loss and is the evaluation criterion for the Vector-jump protection func-
tion. If the phase-angle differential exceeds a set threshold, the generator circuit breaker or the circuit breaker
of the system switch opens. Therefore, the generator unit can be protected against unacceptable stress.
[dw_vector change, 1, en_US]
Figure 6-224 Vector Change after the Load Shedding
Table 6-17 Vector Description
Vector Description
V
p
Vector of the generator internal voltage (rotor voltage)
V Vector of the generator terminal voltage
ΔV Vector of the voltage differential
V' Vector of the terminal voltage after the load shedding
ΔV' Vector of the voltage differential after the load shedding
Protection and Automation Functions
6.36 Vector-Jump Protection
792 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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