The parameter is defined as -Δα = –(α2 – α1).
To calculate the Delta parameters, the voltage of side 2 is converted to the voltage of side 1 using to the
settings of both parameters.
In the Application and Setting Notes, several examples are provided for using both parameters.
Different Connection Types on Both Sides
If both of the measuring points used by the synchronization functions record different voltages of the 3-phase
system, the calculation of the phase displacement angle is automatically taken into consideration.
EXAMPLE:
The 1-phase measuring point connected with Sync-voltage 1 records the phase-to-phase voltage V
AB
. The 1-
phase measuring point connected with Sync-voltage 2 records V
A
. In this case the phase angle between V
AB
and V
A
takes into consideration the delta variable Δα during calculation..
This automation guarantees that several voltage sources can be switched between during running operation,
each of which records different voltages.
Application and Setting Notes (General)
Stage-Type Selection
The following 2 types of stage are available:
Stage Type Application
Synchrocheck stage Select this type of stage to issue, for example, an additional release
during an automatic reclosing or a manual reclosing for safety reasons.
With this type, the variables ΔV, Δf and Δα are checked before
connecting the 2 parts of the power system.
Synchronous/asynchronous stage Select this type of stage if it is necessary to differentiate between
synchronous and asynchronous systems, depending on the switch posi-
tion.
If galvanically coupled systems are switched in parallel, synchronous
systems are present. A typical characteristic for synchronous systems is
equality of frequency (Δf ≈ 0). In this state, the conditions Δα and ΔV
are checked.
If the systems are galvanically isolated, asynchronous systems can be
present. At the same time, compliance with the voltage difference ΔV
and frequency difference Δf conditions is checked. The time of the
direct close command is calculated taking into account the angle differ-
ence Δα and the closing time of the circuit breaker. The time of the
direct close command is calculated so that the voltages are equal at the
moment of pole contact of the circuit breaker (ΔV ≈ 0, Δα ≈ 0).
Configuration of the Voltages V1 (Reference Side) and V2
The voltages V1 and V2 are established via the connection of the measuring points to the interface of the
function groups (refer to chapter 8.4.3 Connection and Definition). The measuring point connected to the
interface Voltage is the reference side 1 with the reference voltage V1. The measuring point connected to the
interface Sync. voltage is the side 2 with V2. The definition of the Delta parameters that can be derived from
this is also described in chapter 8.4.3 Connection and Definition.
Parameter: Min. operating limit Vmin, Max. operat. limit Vmax
•
Recommended setting value (_:5071:101) Min. operating limit Vmin = 90 V
•
Recommended setting value (_:5071:102) Max. operat. limit Vmax = 110 V
The values define the voltage operating range of the synchronization stage. A normal setting is approx. ±10 %
of the rated voltage.
8.4.4.2
Control Functions
8.4 Synchronization Function
SIPROTEC 5, Overcurrent Protection, Manual 1135
C53000-G5040-C017-8, Edition 07.2017
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