ABB RELION REM615, Product Manual

Page: 16 / 72

15. Current circuit
supervision
The IED includes 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
The IED is equipped with three phase-current
inputs, one residual-current input, three phase-
voltage inputs and one residual voltage input.
The phase-current inputs and the residual
current inputs are rated 1/5 A, that is, the
inputs allow connection of either 1 A or 5 A
secondary current transformers. The optional
residual-current input 0.2/1 A is normally
used in applications requiring sensitive earth-
fault protection and featuring core-balance
current transformers. 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 rated values of the current and voltage
inputs are settable parameters of the IED. In
addition, the binary input thresholds are
selectable within the range of 18…176 V DC
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 A
and 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.
Motor Protection and Control 1MRS756890 D
REM615
Product version: 3.0
Issued: 2010-06-29
16 ABB