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Chapter 10. Receiving Tests
M7IRDA2003I
7IRD-A/J/M: Distribution Protection & Control Terminal
© ZIV APLICACIONES Y TECNOLOGÍA, S.L.U. 2020
10-6
10.5.3 Open Phase Test
Put out of order all the Phase and Ground elements, verify that the breaker is OFF and apply a
two currents system as follow:
Ia = 1/0º and Ib = 1/60º (the angles are inductive).
Set the unit to 0.2 I2/I1 and check that has not pick up. Increase the Phase B current and check
that the unit pick up (pick up flag to “1”) with a current value, on the Phase B, between 1.35 Aac
and 1.49 Aac. Apply a 1 Aac current to Phase A and check that a trip occurred between 10.5 s
and 9.5 s, for a 10 s time setting. Verify that the tripped contact close.
Verify too that setting unit to 0.2 I2/I1 and setting the
Minimal Load in the Line to 1.2 A if Ia =
1/0º and Ib = 2/60º is applied the unit doesn’t pick up; if at the same conditions set the Minimal
Load in the Line to 0.8 A, the unit pick up.
10.5.4 Residual Current Test
Check that the pickup element (the pickup flag at "1") for a determined setting (X) when applied,
for the ground input, between (X

1.10 - X

1) for low ranges, the pickup interval can extend
up to

20 mA. Apply a current of 2 X and check that it produces a trip in the amount of time
between (T

1.05 - T

0.95.) or T

25ms, T being the element time setting.
10.5.5 Breaker Failure Test
To test it, assign the Logic Outputs signal, the Breaker Failure Output (BF) to one of the
Auxiliary Contact Outputs. Disable all elements except for Phase and Ground Instantaneous
Overcurrent and Breaker Failure.
Set the Phase and Ground Instantaneous Overcurrent Pickup to 0.5A and set their Time Delay
to zero. Set Breaker Failure Time Delay to the desired value of current reposition and actuation
time. Produce a trip by applying 1Aac Phase to Ground to the Phase A and Ground Current
Analog Inputs, and maintain the current after the Phase and Ground elements trip. The Breaker
Failure element should operate between

(0.025 s. or 5%) of the setting value. The operation
of the Breaker Failure element should activate the Auxiliary Contact Output.
Gradually reduce the current until the Breaker Failure element reaches a stable reset. Verify
that this occurs between

5% of the setting value.