Setting Guidelines; Common Settings For All Steps - Hitachi Relion 670 Series Applications Manual

Section 8
Current protection
8.2.3

Setting guidelines

The parameters for the four step residual over-current protection are set via the local HMI or PCM600.
The following settings can be done for the function.
Common base IED values for the primary current (IBase), primary voltage (VBase) and primary power
(SBase) are set in global base values for settings function GBASVAL.
GlobalBaseSel: Selects the global base value group used by the function to define IBase, VBase and
SBase. Note that this function will only use IBase .
SeqTypeUPol: To select the type of voltage polarising quantity (that is, Zero seq or Neg seq for direction
detection).
SeqTypeIPol: To select the type of current polarising quantity (that is, Zero seq or Neg seq for direction
detection).
SeqTypeIDir: To select the type of operating current quantity (that is, Zero seq or Neg seq for direction
detection).
8.2.3.1

Common settings for all steps

AngleRCA: Relay characteristic angle given in degree. This angle is defined as shown in Figure 58. The
angle is defined positive when the residual current lags the reference voltage (Vpol = -3V0 or -3V2)
ANSI05000135 V3 EN-US
Figure 58:
In a normal transmission network a normal value of RCA is about 65°. The setting range is -180° to
+180°.
120
When inverse time over-current characteristic is selected, the trip time of the stage will be the
sum of the inverse time delay and the set definite time delay. Thus, if only the inverse time
delay is required, it is important to set the definite time delay for that stage to zero.
RCA
Operation
IDirPU
Relay characteristic angle given in degree
© 2017 - 2023 Hitachi Energy. All rights reserved
V pol = 3V or V
0 2
en 05000135-4- ansi. vsd
1MRK511407-UUS Rev. N
IP14988-1 v1
M15282-3 v14
M15282-81 v12
Phasor measurement unit RES670
Application manual