Siemens SIPROTEC 4 7VE61 User Manual

Checking the Synchrocheck
Hierzu sind die gleichen Prüfschritte, wie bei der Synchronisierfunktion durchzuführen (siehe oben). In der
Variante 1ph Sync check wird für jede Seite nur eine Spannung benutzt. Es entfällt damit die Drehfeldkon-
trolle.
Measuring the Operating Time of the Circuit Breaker
General
In order to achieved an exact parallel switching with a zero phase angle, it is necessary – under asynchronous
system conditions – that the operating time of the circuit breaker is measured and set correctly when closing.
If it is switched exclusively with synchronism systems conditions, this section can be skipped.
With External Timer
For measuring the operating time a setup as shown in Figure 3-24 is recommended. The timer is set to a range
of 1 s and a graduation of 1 ms.
The circuit breaker is connected manually. At the same time the timer is started. After closing the poles of the
circuit breaker, the voltage U
Line
appears and the timer is stopped.
If the timer is not stopped due to an unfavourable closing moment, the attempt will be repeated.
It is particularly favourable to calculate the mean value from several (3 to 5) successful switching attempts.
i
i
NOTE
You may add to the measured value the operating time of the parallel switching device (22 ms at f
N
= 50 or
60 Hz; 42 ms at f
N
= 16.7 Hz) and set the total length of time under address 6120 as T-CB close. Round
off to the next lower settable value. Proceed for all used synchronizing functions 2 to 8 in the same way.
[messung-der-ls-eigenzeit-260602-kn, 1, en_GB]
Figure 3-24 Measuring the circuit breaker closing time
By Reading Out from Fault Records
The circuit breaker closing time can be also determined by reading out fault records in respect to the time
delay between the CLOSE command to the circuit breaker and the closing of the circuit breaker poles. In such
case, the obtained time from the fault record is the real circuit breaker closing time.
To do so, the following procedure is recommended:
•
Set a similar state which can be switched with no danger of the circuit breaker.
•
Activate the parameter 6107 SYNC U1<U2> in the synchronization functional group 1 setting to YES, if
U2 is switched. The setting for the parameter 6108 SYNC U1>U2< = YES applies when switching
through to U1.
3.3.9
Mounting and Commissioning
3.3 Commissioning
182 SIPROTEC 4, 7VE61 and 7VE63, Manual
C53000-G1176-C163-3, Edition 10.2017

Siemens SIPROTEC 4 7VE61 Specifications

General

Brand	Siemens
Model	SIPROTEC 4 7VE61
Category	Power distribution unit
Language	English