Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7SC805, Manual
C53000-G1140-C380-1, Release date 05.2014
94
3.3
Commissioning
WARNING!
Warning of dangerous voltages when operating an electrical device
Non-observance of the following measures can result in death, personal injury or substantial property damage.
Only qualified people shall work on and around this device. They must be thoroughly familiar with all warnings
and safety notices in this instruction manual as well as with the applicable safety steps, safety regulations, and
precautionary measures.
Before making any connections, the device must be grounded at the protective conductor terminal.
Hazardous voltages can exist in all switchgear components connected to the power supply and to measure-
ment and test circuits.
Hazardous voltages can be present in the device even after the power supply voltage has been removed (ca-
pacitors can still be charged).
After switching off the auxiliary voltage, wait a minimum of 10 seconds before reconnecting this voltage so that
steady conditions can be established.
The limit values given in Technical Data (Chapter 4) must not be exceeded, neither during testing nor during
commissioning.
When testing the device with secondary test equipment, make sure that no other measurement quantities are
connected and that the trip and close circuits to the circuit breakers and other primary switches are disconnect-
ed from the device.
DANGER!
Hazardous voltages during interruptions in secondary circuits of current transformers
Non-observance of the following measure will result in death, severe personal injury or substantial property
damage.
Short-circuit the current transformer secondary circuits before current connections to the device are opened.
Switching operations have to be carried out during commissioning. A prerequisite for the prescribed tests is that
these switching operations can be executed without danger. They are accordingly not intended for operational
checks.
WARNING!
Warning of dangers evolving from improper primary tests
Non-observance of the following measures can result in death, personal injury or substantial property damage.
Primary tests are only allowed to be carried out by qualified personnel, who are familiar with the commissioning
of protection systems, the operation of the plant and the safety rules and regulations (switching, grounding,
etc.).
3.3.1
Merging Unit Functionality
Additional to the typical wiring of the CT, VT, BI and BO the MU device 7SC805 must be connected to the
SV(Sample Value) subscriber, e.g. SIPROTEC5 device, via optical fiber Ethernet connections. The MU can be
