2 The current inputs are located in the TRM. The following settings shall be used for the current
inputs in this example:
HV side (two inputs):
•
CTprim = 200A
•
CTsec = 1A
•
CTStarPoint = ToObject
LV side (one input):
•
CTprim = 1200A
•
CTsec = 1A
•
CTStarPoint = ToObject
Inside the IED, only the ratio of the first two parameters is used. The third parameter (
CTStarPoint
= ToObject) causes no change on the measured currents. In other words, currents are already
measured towards the protected object.
3 These connections are the links between the current inputs and the input channels of the two
preprocessing function blocks. The preprocessing block digitally filters the connected currents and
calculates:
•
fundamental frequency phasors for all input channels
•
harmonic content for all input channels
•
positive- and zero-sequence quantities by using the fundamental frequency phasors (phase
L1 taken as reference for sequence quantities)
These calculated values are then available for all built-in protection and control functions within the
IED that are connected to this preprocessing function block. For this application most of the
preprocessing settings can be left to the default values.
4 GxAI2P output on the SMAI function block is a grouped signal which contains all the data about
the phase L1, phase L2 and the neutral quantity; in particular, the data about fundamental
frequency phasors, harmonic content, positive sequence and zero sequence quantities are
available.
5 Two group signals (G1AI2P and G2AI2P) in the preprocessing blocks SMAI1 and SMAI2 are
connected to the inputs I2PW1 and I2PW2 in T1PPDIF.
Phase selection settings for the measured currents in T1PPDIF:
•
PhSelW1 = (IL1-IL2)/2
•
PhSelW2 = IL1
•
InvW2Curr = No
Section 6
1MRK 506 375-UEN A
Differential protection
92
Railway application RER670 2.2 IEC
Application manual
Summary of Contents for RELION RER670
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