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NVA100X-D - Manual - 02 - 2016
FUNCTION CHARACTERISTICS
If the operation mode is switched to “not directional” (by the 74VT function), the start of any 67N
threshold becomes active when the following is complied:
- The residual current (
I
E
) fundamental component overcomes the threshold (
I
ED>
,
I
ED>>
,
I
ED>>>
,
I
ED>>>>
)
For both the operating mode (module or projection), when the start signal goes ON a concerning
counter starts; after expiry of the associated operate time (
t
ED>
,
t
ED>>
,
t
ED>>>
,
t
ED>>>>
) a trip command
is issued, if instead the above conditions don’t remain valid, the element it is restored.
All the parameters are located inside the menus concerning the four elements, separately for defi -
nite and inverse time characteristics.
Example: the operate time concerning the fi rst threshold with defi nite time characteristic (
IED>def
)
is available inside the
Set \ Profi le A(or B) \ Directional earth fault overcurrent-67N \
IED> Element
\ Defi nite time
menu.
All directional earth fault overcurrent elements can be enabled or disabled by setting
ON
or
OFF
the
IED> Enable
,
IED>> Enable,
,
IED>>> Enable
e/o
IED>>>> Enable
parameters in-
side the
Set \ Profi le A(or B)\Directional earth fault overcurrent-67N \
IED> Element
(
IED>> Element
,
IED>>> Element
,
IED>>> Element) \ Setpoints
menus.
The fi rst and second overcurrent element can be programmed with defi nite or inverse time charac-
teristic by setting the
IED>Curve
and/or
IED>>Curve
(
DEFINITE, IEC/BS A, IEC/BS B, IEC/
BS C, ANSI/IEE MI, ANSI/IEE VI, ANSI/IEE EI, EM
) available inside the
Set \ Profi le A(or B) \
Directional earth fault overcurrent-67N \
IED> Element
(
IED>> Element) \ Setpoints
menus.
The trip of IED> element may be inhibited by the start of the second, third and/or fourth element (
I
ED>>
,
I
ED>>>
,
I
ED>>>>
) by setting
ON
the Disable IED> by start IED>>, Disable IED> by start IED>>>, Dis-
able IED> by start IED>>>> (
IED>disbyIED>>, IED>disbyIED>>>, IED>disbyIED>>>>
)
parameters available inside the
Set \ Profi le A(or B) \ Directional earth fault overcurrent-67N
\ IED>> Element
(
IED>>> Element, IED>>>> Element) \ Setpoints
menus.
Similarly the trip of the:
IED>> element may be inhibited by start of the third and/or fourth element (
IED
>>> and/or
IED
>>>>)
by setting
ON
the Disable IED>> by start IED>>>, start IED>>>> (
IED>>disbyIED>>>,
IED>>disbyIED>>>>
) parameter available inside the
Set \ Profi le A(or B) \ Directional earth
fault overcurrent-67N \ IED>>> Element (IED>>>> Element) \ Setpoints
menus.
IED>>> element may be inhibited by start of the fourth element (
IED
>>>>) by setting
ON
the Dis-
able IED>>> by start IED>>>> (
IED>>>disbyIED>>>>
) parameter available inside the
Set \
Profi le A(or B) \ Directional earth fault overcurrent-67N \ IED>>>> Element \ Setpoints
menu.
All the named parameters can be set separately for
Profi le A
and
Profi le B
.
An adjustable reset time delay is provided for every threshold (
t
ED>RES
,
t
ED>>RES
,
t
ED>>>RES
,
t
ED>>>RES
).
.
Breaker failure (BF)
Each directional earth fault element can produce the Breaker Failure output if the
IED> BF
,
IED>>
BF
,
IED>>> BF
and/or
IED>>>> BF
parameters are set to
ON.
The parameters are available
inside the
Set \ Profi le A(or B) \ Directional earth fault overcurrent-67N \
IED> Element
(
IED>> Ele-
ment
,
IED>>> Element
,
IED>>> Element) \ Setpoints
menus.
[1]
Cold load pickup (CLP)
If the CLP function (Cold Load Pick-up) is enabled for element blocking, the selected threshold may
be blocked for an adjustable time interval, starting from the circuit breaker closure.
This operating mode may be select by setting
ON-Element blocking
the
IEDCLP> Mode, IED-
CLP>> Mode, IEDCLP>>> Mode, IEDCLP>>>> Mode
parameters.
If the CLP function (Cold Load Pick-up) is enabled for threshold change, the selected threshold may
be changed for an adjustable time interval, starting from the circuit breaker closure.
This operating mode (
ON-Change setting =
IEDCLP> Mode, IEDCLP>> Mode, IED-
CLP>>> Mode, IEDCLP>>>> Mode
) and the concerning operating time within the CLP (
tED-
CLP>, tEDCLP>>, tEDCLP>>>, tEDCLP>>>>
) may be adjusted inside the
Set \ Profi le
A(or B) \ Directional earth fault overcurrent-67N \
IED> Element
(
IED>> Element
,
IED>>> Element
,
IED>>> Element) \ Setpoints menus
, whereas the operating thresholds within the CLP (
IEDCLP>def,
IEDCLP>inv,....
) may be adjusted inside the
Set \ Profi le A(or B) \ Directional earth fault overcur-
rent-67N \
IED> Element
(
IED>> Element
,
IED>>> Element
,
IED>>> Element) \ Defi nite time (Inverse
time)
menus
.
Note 1 The common settings concerning the Breaker failure protection are adjustable inside the
Breaker Failure - BF
menu.
•
•
Timers-F67N.ai
IED> Start
IED> Trip
t
ED>
t
ED>
RESET
INPUT
t
ED>RES
t
ED>RES
t
ED>RES
t
67N element timers - first element
