17
14. Fuse failure supervision
The relay includes fuse failure supervision function-
ality. The fuse failure supervision detects failures
between the voltage measurement circuit and the
relay. The failures are detected either by the nega-
tive sequence-based algorithm or by the delta volt-
age and delta current algorithm. Upon the detec-
tion of a failure, the fuse failure supervision
function activates an alarm and blocks voltage-de-
pendent protection functions from unintended op-
eration.
15. Current circuit supervision
The relay includes current circuit supervision. Cur-
rent 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 opera-
tion. The current circuit supervision function calcu-
lates the sum of the phase currents from the pro-
tection cores and compares the sum with the
measured single reference current from a core bal-
ance current transformer or from separate cores in
the phase current transformers.
16. Access control
To protect the relay from unauthorized access and
to maintain information integrity, the relay is pro-
vided with a four-level, rolebased authentication
system with administrator-programmable individ-
ual passwords for the viewer, operator, engineer
and administrator levels. The access control applies
to the local
HMI, the Web HMI and PCM600.
17. Inputs and outputs
The relay is equipped with three phase-current in-
puts, one residual-current input, three phase-volt-
age inputs and one residual voltage input. The
phase-current inputs and the residual current in-
-
nection of either 1 A or 5 A secondary current trans-
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 phaseto- earth volt-
ages can be connected.
The standard configuration D includes one conven-
sensor inputs for the direct connection of three
combi-sensors with RJ-45 connectors. As an alter-
native to combi-sensors, separate current and volt-
age sensors can be utilized using adapters. Further-
more, the adapters also enable the use of sensors
with Twin-BNC connectors.
The rated values of the current and voltage inputs
are settable parameters of the relay. In addition, the
binary input thresholds are selectable within the
range of 16…176 V DC by adjusting the relay’s pa-
rameter 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 relay offers six RTD inputs and two mA inputs.
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 mea-
suring and monitoring purposes, be used for trip-
ping and alarm purposes using the offered optional
multipurpose protection functions.
Optionally, a binary input and output module can be
selected. It has three high speed binary outputs
(HSO) and it decreases the total operate time with
typically 4...6 ms compared to the normal power
outputs.
-
nal diagrams for more information about the inputs
and outputs.
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