ABB RELION RET670 User Manual

A
IA
IB
IC
B C
Protected Object
IED
C
T
8
0
0
/1
in
D
e
lta
D
C
A
C
o
n
n
e
cte
d
IC-IB
IB-IA
IA-IC
2
3
4
ANSI11000028-2-en.vsd
SMAI_20
ANSI11000028 V2 EN-US
Figure 18: Delta DAC connected three-phase CT set
In this case, everything is done in a similar way as in the above described example,
except that for all used current inputs on the TRM the following setting parameters
shall be entered:
CT
prim
=800A
CT
sec
=1A
• CTWyePoint=ToObject
• ConnectionType=Ph-Ph
It is important to notice the references in SMAI. As inputs at Ph-Ph are expected to be
A-B, B-Crespectively C-A we need to tilt 180º by setting ToObject.
4.2.2.7 Example how to connect single-phase CT to the IED
SEMOD55055-431 v8
Figure
19 gives an example how to connect the single-phase CT to the IED. It gives an
overview of the required actions by the user in order to make this measurement
available to the built-in protection and control functions within the IED as well.
Section 4 1MRK 504 163-UUS A
Analog inputs
84 Transformer protection RET670 2.2 ANSI
Application manual

ABB RELION RET670 Specifications

General

Rated Frequency	50/60 Hz
Communication Protocols	IEC 61850, IEC 60870-5-103, DNP3
Operating Temperature Range	-25°C to +55°C
Mounting	Rack Mounting
Input Voltage	100-240 V AC
Protection Functions	Overcurrent Protection
Enclosure	IP20