Verifying The Signals And Settings; Measuring The Operate Limit - Hitachi RET670 Commissioning Manual

1MRK 504 165-UEN Rev. K
11.14.14.2

Verifying the signals and settings

The Fault locator function LMBRFLO depends on other functions to work properly, that is, phase
selection information from distance protection function and analog information supplied by the trip
value recorder function. Check that proper binary start and phase selection signals are connected
and voltage and current signals are configured (parameter settings).
The result is displayed on the local HMI or via PCM600. Distances to faults for the last 100 recorded
disturbances can be found on the local HMI under Main menu/Disturbance Records /Disturbance
#n(n = 1–100)/General Information
If PCM600 is used, the result is displayed on the recording list after upload, including loop selection
information.
Table 41:
Parameter
I
Healthy conditions
Impedance |Z|
Impedance angle ZF
11.14.14.3

Measuring the operate limit

1. Set the test point (|Z| fault impedance and ZF impedance phase angle ) for a condition that
meets the requirements in
2. Subject the IED to healthy normal load conditions for more than the prefault recording time in
DRPRDRE function.
3. Apply a fault condition.
Check that the distance-to-fault value displayed on the HMI complies with
Equation 132
p
EQUATION123 V1 EN-US
in % for two- and three-phase faults
p
EQUATION124 V1 EN-US
in % for single-phase-to-earth faults
Transformer protection RET670
Commissioning manual
Test settings
Condition
Higher than 30% I
U = 63,5 V, I = 0 A & ZF = 0°
Test point
Note:
•
•
•
Test angle
•
•
Table
and Equation 133
Z
x
×
------ - 100
=
X1
×
3 Z
= ×
x 100
+ ×
X0 2 X1
© 2017 - 2022 Hitachi Energy. All rights reserved
r
£ (X0 + 2 · X1)/3 For single-phase faults
Z
x
£ X1 For three and two phase faults
Z
x
£ (X0 + 2 · X1 XM)/3 For single-phase fault with mutual zero-sequence
Z
x
current
ZF arctan[(X0 + 2 · X1) / (R0 + 2R1)] For single-phase faults
ZF arctan(X1/R1) For two-phase faults
41.
Section 11
Testing functionality by secondary injection
GUID-0FDCCF3B-63C5-463E-AD67-2AE3633E9CE9 v1
Equation 131,
(Equation 131)
(Equation 132)
M14955-48 v7
273