Hitachi Relion 670 Series Commissioning Manual page 163

1MRK506371-UUS Rev. M
ANSI06000651 V2 EN-US
Figure 45:
Operation mode 3I
1. Set the polarizing voltage to 1.2 · VNRelPU and set the phase angle between voltage and current
to the set characteristic angle (RCADir). Note that the current lagging the voltage.
2. Inject current until the function picks up, and make sure that the trip power is equal to the SN_PU
setting for the set directional element.
Note that for pick-up, both the injected current and voltage must be greater than the set values
INRelPU and VNRelPU respectively.
The function activates the PICKUP and PUDIRIN outputs.
3. Assume that φ´ is the phase angle between injected voltage (3V
RCADir-φ. Change φ´ to for example 45 degrees. Increase the injected current until the function
trips.
4. Compare the result with the set value and make sure that the new injected 3I
to the setting SN_PU. Take the set characteristic into consideration, see figure
5. Measure the trip time of the timer by injecting 1.2 · VNRelPU and a current to get two times the set
SN_PU trip value.
Line distance protection REL670
Commissioning manual
Instrument
transformer

angle error
RCAcomp
3I (to prot)
3I (prim)
0
0
Explanation of RCAcomp
· 3V · cos φ
0 0
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Testing functionality by secondary injection
RCADir = 0º
Trip area
-3V =V
0 ref
Characteristic after
angle compensation
ANSI06000651-2-en.vsd
) and current (3I
0
Section 11
SEMOD175060-76 v8
) i.e. φ´ =
0
· 3V · cos φ is equal
0 0
44 and figure 45.
157