Checking System Connections - Siemens SIPROTEC 7SJ62 Manual

3.2.2

Checking System Connections

WARNING!
Warning of dangerous voltages
Non-observance of the following measures can result in death, personal injury or substantial property damage.
Therefore, only qualified people who are familiar with and adhere to the safety procedures and precautionary
measures should perform the inspection steps.
Caution!
Take care when operating the device without a battery on a battery charger.
Non-observance of the following measures can lead to unusually high voltages and consequently, the destruc-
tion of the device.
Do not operate the device on a battery charger without a connected battery. (For limit values see also Technical
Data, Section 4.1).
If undervoltage protection is configured and enabled in the device and if, at the same time, the current criterion
is disabled, the device picks up right after auxiliary voltage has been connected, since no measuring voltage is
available. To make the device configurable, pickup is to be stopped, i.e. the measuring voltage is connected or
voltage protection is blocked. This can be performed by operation.
Before the device is energized for the first time, it should be in the final operating environment for at least 2
hours to equalize the temperature, to minimize humidity and to avoid condensation. Connections are checked
with the device at its final location. The plant must first be switched off and grounded.
Proceed as follows in order to check the system connections:
• Protective switches for the power supply and the measured voltages must be opened.
• Check the continuity of all current and voltage transformer connections against the system and connection
diagrams:
– Are the current transformers grounded properly?
– Are the polarities of the current transformer connections the same?
– Is the phase relationship of the current transformers correct?
– Are the voltage transformers grounded properly?
– Are the polarities of the voltage transformers correct?
– Is the phase relationship of the voltage transformer connections correct?
– Is the polarity for current input I
– Is the polarity for voltage input V
delta winding or busbar voltage)?
• Check the functions of all test switches that are installed for the purposes of secondary testing and isolation
of the device. Of particular importance are „test switches " in current transformer circuits. Be sure these
switches short-circuit the current transformers when they are in the test mode.
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
correct (if used)?
4
correct (only with 7SJ623, 7SJ624, 7SJ64 and if used, e.g. for broken
4
Mounting and Commissioning
3.2 Checking Connections
441