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Section 11
Testing functionality by secondary injection
4.
Repeat the above steps by creating fault in L2 and L3 phases. The outputs FLTL2, FLT1PH and
FLTL3, FLT1PH will be activated for L2 and L3 faults respectively. The service values STCND and
RELCND will show the values 2 and 4 for L2 and L3 faults respectively.
5.
Create a power swing condition by repeating Step
simultaneously reducing the voltages and increasing the currents in phases L1 and L2. Ensure that
the negative sequence current (I2) is above 12% IB. At this condition, the outputs FLTL1, FLTL2
and FLT2PH will be activated. The service values STCND and RELCND will show the value as 8.
6.
Repeat Step
FLTL2, FLTL3, FLT2PH and FLTL3, FLTL1, FLT2PH will be activated for L2L3 and L3L1 faults
respectively. The service values STCND and RELCND will show the values 16 and 32 for L2L3 and
L3L1 faults respectively.
7.
Create a power swing condition by repeating Step
simultaneously reducing the voltages and increasing the currents in all three phases. At this
condition, the outputs FLTL1, FLTL2, FLTL3 and FLT3PH will be activated. The service values
STCND and RELCND will show the value as 56.
11.3.1.3
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.3.2
Out-of-step protection OOSPPAM
The out-of-step protection (OOSPPAM (78)) function in the IED can be used for both generator protection
and as well for line protection applications.
The main purpose of the OOSPPAM (78) function is to detect, evaluate, and take the required action
during pole slipping occurrences in the power system.
The OOSPPAM (78) function detects pole slip conditions and trips the generator as fast as possible, after
the first pole-slip if the center of oscillation is found to be in zone 1, which normally includes the generator
and its step-up power transformer. If the center of oscillation is found to be further out in the power
system, in zone 2, more than one pole-slip is usually allowed before the generator-transformer unit is
disconnected. A parameter setting is available to take into account the circuit breaker opening time. If
there are several out-of-step relays in the power system, then the one which finds the center of oscillation
in its zone 1 should operate first.
Two current channels I3P1 and I3P2 are available in OOSPPAM function to allow the direct connection of
two groups of three-phase currents; that may be needed for very powerful generators, with stator
windings split into two groups per phase, when each group is equipped with current transformers. The
protection function performs a simple summation of the currents of the two channels I3P1 and I3P2.
11.3.2.1
Verifying the settings
The test of the out-of-step protection function is made to verify that the trip is issued if the following
events happen.
•
the impedance, seen by the function, enters the lens characteristic from one side and leaves it from
the opposite side
•
the trip is issued according to the settings TripAngle and tBreaker
The tripping zone needs to be detected and confirmed. The test may be performed by taking into account
the following key points that are shown in Figure 25:
90
5
by creating faults between phases L2 and L3 and between L3 and L1. The outputs
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2
and create a phase-phase fault condition by
2
and create a 3-Phase fault condition by
GUID-BF2F7D4C-F579-4EBD-9AFC-7C03296BD5D4 v8
Phasor measurement unit RES670
1MRK 511 409-UUS Rev. K
GUID-7B491383-51C7-4078-B693-4A57AEDD9E32 v1
GUID-708C4033-3111-481F-9868-FF207C18C9F9 v2
Commissioning manual
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