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11.12
Primary and Secondary Testing of the Synchronization Function
Measuring the Circuit-Breaker Closing Time
Under asynchronous system conditions, the circuit-breaker closing time must be measured and set correctly.
This achieves an exact parallel switching with a phase angle 0
conditions, this section can be skipped.
The closing time can be determined via the following 2 methods:
•
1. By reading from a fault record (recommended method)
•
2. With external timer
1. A simple option for determining the closing time involves reading out the time between the close command
and closure of the switch pole via the fault record. The time determined here is the real closing time and not
the operating time of the circuit beaker. You do not have to add any further time.
Siemens recommends the following procedure:
Establish a condition in which the circuit breaker can be closed without hazard.
²
If V2 switching through, activate the operating mode Close cmd. at V1< & V2> for the synchroni-
²
zation stage by setting to yes.
If V1 is switched through, activate the operating mode Close cmd. at V1> & V2<.
Make sure that the fault recorder is turned on. Via a temporary CFC chart, link the signal Release
²
close cmd. of the active synchronization stage to the binary input signal >Manual start (of the
fault recorder). With the release of closure, a fault record of the parameterized duration is set up (the
default setting of 500 ms is more than adequate for this).
Starting the synchronization stage. The device activates immediately.
²
Read the fault record and determine the closing time via SIGRA (see
²
Use the 2 cursors and the time-measuring function for this. Position the first cursor on the raising close
command. The occurrence of the second voltage signals the closed power-switching poles. Place the
second cursor on the raising second voltage.
Set the determined time with the CB make time parameter. Round off to the next lower adjustable
²
value. Proceed in the same way for all other sync stages.
Set the parameter Close cmd. at V1< & V2> or parameter Close cmd. at V1< & V2< back to
²
its original value.
Delete the CFC chart.
²
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
11.12 Primary and Secondary Testing of the Synchronization Function
o
. If switching occurs only in synchronous system
Figure
Functional Tests
11-8).
1391
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