Siemens siprotec 7SA6 User Manual

Installation and Commissioning
8-457SA6 Manual
C53000-G1176-C156-2
8.2.3 Checking Power Plant Connections
Before the d evice is energized for th ef irst time, the device should be in the final oper ating env ironment for at least 2 ho urs to equalize the temp erature and t o minimize humidity and avoid condens ation. Connection are che cked with the device at its final loca tion. The plan t must first be switched off and grou nded.
o Protective switches (e.g. test switches, fuses, or miniature circuit breakers) for the
power supply and the measured voltages must be opened.
o Check the continuity of all current and voltage transformer connections against the
system and connection diagrams:
G Are the current transformers grounded properly?
G Are the polarities of the current transformers the same?
G Is the phase relationship of the current transformers correct?
G Are the voltage transformers grounded properly?
G Are the polarities of the voltage transformers correct?
G Is the phase relationship of the voltage transformers correct?
G Is the polarity for current input I
4
correct (if used), also refer to Subsection 8.1.2,
“Currents”?
G Is the polarity for voltage input U
4
correct (if used, e.g. with broken delta winding or
busbar voltage), cf. also Subsection 8.1.2, “Voltages”?
o Check the functions of all test switches that may be installed for the purposes of sec-
ondary testing and isolation of the device. Of particular importance are test switches
in current transformer circuits. Be sure these switches short-circuit the current trans-
formers when they are in the test mode (open).
o The short-circuit feature of the current circuits of the device are to be checked. An
ohmmeter or other test equipment for checking continuity is needed. Be sure that con-
tinuity is not simulated by the reverse connected current transformers themselves or
their short-circuit links.
G Remove the front panel of the device (see Figure 8-9 to 8-11).
G Remove the ribbon cable connected to the I/O–2 board with the measured current
and measured voltage inputs (on the front side it is the right printed circuit board,
for housing size
1
/
3
, see Figure 8-9 [slot 19], for housing size
1
/
2
seeFigure8-10
[slot 33], for housing size
1
/
1
seeFigure8-11[slot33right].Furthermore,remove
the printed circuit board so that there is no more contact anymore with the plug-in
terminal.
Warning!
Some of the following test steps will be carried out in presence of hazardous voltages.
They shall be performed only by qualified personnel which is thoroughly familiar with
all safety regulations and precautionary measures and pay due attention to them.
Caution!
Operatingthedeviceonabatterychargerwithoutaconnectedbatterycanleadtoun-
usually high voltages and consequently, the destruction of the device. For limit values
see Subsection 10.2.1 under Technical Data.

Siemens siprotec 7SA6 Specifications

General

Brand	Siemens
Model	siprotec 7SA6
Category	Relays
Language	English