ABB REU615, Product Manual, Page: 14 / 60

15. Current circuit supervision
Current circuit supervision is used for detecting
faults in the current transformer secondary
circuits. On detecting of a fault the current circuit
supervision function activates an alarm LED and
blocks certain protection functions to avoid
unintended operation. The current circuit
supervision function calculates the sum of the
phase currents from the protection cores and
compares the sum with the measured single
reference current from a core balance current
transformer or from separate cores in the phase
current transformers.
16. Access control
To protect the IED from unauthorized access and
to maintain information integrity, the IED is
provided with a four-level, role-based
authentication system with administrator-
programmable individual passwords for the
viewer, operator, engineer and administrator level.
The access control applies to the front-panel user
interface, the web-browser based user interface
and the PCM600 tool.
17. Inputs and outputs
Depending on the standard configuration
selected, the IED is equipped with three phase-
voltage inputs and one residual current input or
three phase current inputs, one residual-current
input and three phase voltage inputs.
The residual current input and the phase-current
inputs are rated 1/5 A. The three phase-voltage
inputs and the residual-voltage input covers the
rated voltages 60-210 V. Both phase-to-phase
voltages and phase-to-earth voltages can be
connected.
The phase-current input 1 A or 5 A, the residual-
current input 1 A or 5 A, and the rated voltage of
the residual voltage input are selected in the IED
software. In addition, the binary input thresholds
18…176 V DC are selected by adjusting the IED’s
parameter settings.
All binary inputs and outputs contacts are freely
configurable with the signal matrix or application
configuration functionality of PCM600.
As an option for standard configurations B the
IED offers six RTD inputs and two mA inputs. By
means of the optional RTD/mA module the IED
can measure up to eight analog signals such as
temperature, pressure and tap changer position
values via the six RTD inputs or the two mA
inputs using transducers. The values can, apart
from measuring and monitoring purposes, be
used for tripping and alarm purposes using the
offered optional multipurpose protection functions.
Please refer to the Input/output overview table
and the terminal diagrams for more detailed
information about the inputs and outputs.
Table 4. Input/output overview
Standard
configuration Analog inputs Binary inputs/outputs
CT VT RTD inputs mA inputs BI BO
A - 5 - – 12 10
B
1) 4 3
6
2)
2
2)
8 (14)
3)
10 (13)
3)
1) The optional I/O module and the optional RTD/mA modules are mutually exclusive
2) Optional
3) With optional binary I/O module ( )
Voltage Protection and Control 1MRS757058 D
REU615
Product version: 4.0
14 ABB