Measuring The Operate And Time Limit For Set Values - Hitachi RET670 Commissioning Manual

1MRK 504 165-UEN Rev. K
IED test set
IEC09000021 V2 EN-US
Figure 47:
Values of the logical signals belonging to the sensitive directional residual overcurrent and power
protection are available on the local HMI under Main menu /Test /Function status /Current
protection /SensDirResOvCurr(67N,IN>) /SDEPSDE(67N,IN>):x
11.5.6.1

Measuring the operate and time limit for set values

Operation mode 3I
Procedure
1. Set the polarizing voltage to 1.2 · UNRel> and set the phase angle between voltage and
current to the set characteristic angle (RCADir). Note that the the current lagging the voltage.
Take setting RCAComp into consideration if not equal to 0.
2. Inject current until the function picks up, and make sure that the operate current of the set
directional element is equal to the INcosPhi> setting.
The I Dir (3I
3. Assume that φ´ is the phase angle between injected voltage (3U
RCADir-φ. Change φ´ to for example 45 degrees. Increase the injected current until the
function operates.
4. Compare the result with the set value and make sure that the new injected 3I
to the setting INcosPhi>..
Take the set characteristic into consideration, see Figure
5. Measure the operate time of the timer by injecting a current two times the set INcosPhi> value
and the polarizing voltage 1.2 · UNRel>.
Tinv
IECEQUATION2402 V2 EN-US
6. Compare the result with the expected value.
Transformer protection RET670
Commissioning manual
NI
L1U
L2U
L3U
NU
Principle connection of the test set
· cosφ
0
· cosφ) function activates the START and STDIRIN output.
0
×
kSN Sref
=
( )
× ×
3 I 3 U
j
cos
0 test 0 test
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IED
NI
U1
U2
U3
NU
TRIP
IEC09000021-2-en.vsd
48 and Figure 49.
Section 11
Testing functionality by secondary injection
SEMOD175060-12 v2
SEMOD175060-34 v9
) and current (3I ) i.e. φ´ =
0 0
· cos φ is equal
0
(Equation 81)
165