Siemens Reyrolle 7SR5 Manual page 407

BO
1NO
1NC
2NO
2NC
3NC
4
5
6
7
8
Relay Case Shorting Contacts
CT input terminals and the terminals of normally closed contacts of binary outputs 1, 2, and 3 are fitted with
case mounted shorting contacts which provide a closed contact when the relay is withdrawn from the case.
The operation of these contacts should be checked if they are essential for scheme connections.
CT Shorting contacts checked
Binary Output 1 terminals B2 and
B4 Alarm Checked
Binary Output 2 terminals B10 and
B12 Alarm Checked
Binary Output 3 terminals B14 and
B16 Alarm Checked
AC Analogue Energizing Quantities
Voltage Trim
The voltage inputs of the 7SR5 are provided with a Voltage Trim feature that can be used to compensate for
voltage drop and phase shift introduced by the secondary wiring to the device. The applied voltage is scaled
internally to allow for the actual effects of long secondary wiring runs which case significant voltage attenua-
tion.
The site specific settings required to suit the installed equipment should be verified by primary application and
modified at the commissioning stage. Voltage and current instruments should be used to ensure that the
measurements align with the applied primary quantities. If this feature is used it will cause modified voltage
magnitude and phase to be measured when secondary voltages are directly applied to the device during
secondary testing. The test injection voltages must be adjusted to suit the trim settings or the trim set to zero
for the duration of the applicable tests.
Voltage and current measurement for each input channel is displayed in the Instrumentation Mode sub-
menus, each input should be checked for correct connection and measurement accuracy by single phase
secondary injection at nominal levels. Ensure that the correct instrument displays the applied signal within
limits of the Technical Data.
Secondary
Primary
Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019
Checked
Applied Current........................
CT1 CT2 CT3
I I I
A B C
Notes (method of test)
Applied Voltage.............
CT4 Toler- VT1
ance V /V
I
A AB
G/GS
Functional Tests
9.2 Hardware Measurement Tests
VT2 VT3 Tolerance
V /V V /V
B BC C CA
407