Secondary Testing Of Protection Relays - ABB ANSI Technical Manual

34 ANSI MEDIUM VOLTAGE METAL- CL AD DIGITAL SWITCHGEAR
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Secondary testing of protection relays

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In comparison with traditional switchgear, the
68 Changing correction
overall testing procedure of protection relays has
factors for amplitude
not changed. Protection and metering functions
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of the protection relay are tested with a
69 Changing correction
factors for angle
secondary injection tester. It is assumed that
protection relays are loaded with the final
settings. 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 1 second and Fault.
Notice: Testers for secondary injections do not
NOTICE
support the amplitude and phase 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
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