Siemens 7SJ85 - Vector-Jump Protection; Overview of Functions; Structure of the Function; General Functionality

Vector-Jump Protection
Overview of Functions
The Vector-jump protection function:
•
Is used for network decoupling of the power generating unit in case of a load loss
•
Evaluates the phase-angle jump of the voltage phasors
Structure of the Function
The Vector-jump protection function can be used in the following function groups:
•
Voltage-current 3-phase
•
Voltage 3-phase
•
Generator side
•
Generator stator
•
Transformer side
The Vector-jump protection function comes factory-set with a Δφ stage.
The following stages can operate simultaneously within the function:
•
1 Δφ stage
•
1 I1 < Release stage
[dw_VJP_Structure, 1, en_US]
Figure 6-222 Structure/Embedding of the Function
General Functionality
Description
Basic Principle of Vector-Jump Protection
The following 2 figures show the basic principle of the Vector-jump protection function.
The following figure shows the voltage vector of the steady state condition. The load current causes a voltage
drop between the internal voltage V
p
and the generator terminal voltage V.
If the load is switched off, the following situations occur:
•
The current is reduced.
•
A smaller voltage drop is caused.
6.36
6.36.1
6.36.2
6.36.3
6.36.3.1
Protection and Automation Functions
6.36 Vector-Jump Protection
SIPROTEC 5, Overcurrent Protection, Manual 791
C53000-G5040-C017-8, Edition 07.2017