ABB UniGear Digital, Commissioning And Testing Manual

Page: 75 / 98

SECO NDARY TESTING O F PROTECTIO N R ELAYS INTERLOCKS BETWEEN PANELS
1VLG5000 17 C 63
6 Secondary testing of protection relays
In comparison with traditional UniGear switchgear, the overall testing procedure of protec-
tion relays has not changed. Protection and metering functions of the protection relay are
tested with a secondary injection tester. It is supposed that protection relays are loaded with
the final setting. We recommend testing protection relay metering functionality (U, I, P, cos
φ
,
E) as a part of secondary injections. To get the best performance of the protection relays,
simulate a real network by means of running two sequences – Pre-fault for at least 1second
and Fault.
Testers for secondary injections do not support the amplitude and angle correction
factors of sensors. Therefore, it is recommended to set default values of current and
voltage sensors for testing.
On the protection relay LHMI go to -> Main Menu/Configuration/Analogue inputs/
Current (3I, CT) and Voltage (3U, VT)
– Amplitude Corr x = 1.0000 (default)
– Angle Corr x = 0.0000 deg (default)
where “x” represents A, B or C phase
Figure 97: Changing correction factors for amplitude
Figure 98: Changing correction factors for angle