CHARACTERISTICS
54
NV10B - Manual - 04 - 2022
culated voltage measurement), the thresholds are in p.u.
U
ECn
.
For both measuring criteria, a block of the
U
E
> and
U
E
>> threshold may be select when the 74VT
function is active (external by binary input). The blocking enabling parameter
74VText59N
is avail-
able inside the
Set \ Profile A(or B) \ Residual overvoltage-59N \
Common
configuration
menu.
[1]
The first threshold trip (
U
E
>) may be inhibited by start of the second threshold (
U
E
>>) by setting
ON
the UE> Disabling by UE>> start (
UE>disbyUE>>
) parameter available inside the
Set \ Profile
A(or B) \ Residual overvoltage-59N \ UE>> Element \ Setpoints
menu.
An adjustable reset time delay is provided for every threshold
t
UE>RES
,
t
UE>>RES
.
Both residual overvoltage elements (
U
E
>,
U
E
>>) can produce the Breaker Failure output if the
UE>BF
and
UE>>BF
parameters are set to
ON.
The parameters are available inside the
Set \ Profile A(or B)\Residual overvoltage - 59N \
UE> Element
(
UE>> Element) \ Setpoints
menus.
[2]
All the named parameters can be set separately for
Profile A
and
Profile B
(
Set \ Profile A(or B) \
Residual overvoltage - 59N \
UE> Element
(
UE>> Element) \ Setpoints
menus).
For every of the two thresholds the logic block can be set.
Logical block (Block1)
If the
UE>BLK1
and/or
UE>>BLK1
enabling parameters are set to
ON
and a binary input is de-
signed for logical block (Block1), the protection is blocked off whenever the given input is active.
The trip timer is held in reset condition, so the operate time counting starts when the input block
goes down.
[3]
The enabling parameters are available inside the
Set \ Profile A(or B) \ Residual over-
voltage - 59N \
UE> Element
(
UE>> Element) \ Setpoints
menus, while the
Block1
function must be
Note 1 The operating time must be adjusted to a greater value than the 74VT activation time (internal or binary input)
Note 2 The common settings concerning the Breaker failure protection are adjustable inside the
Breaker Failure - BF
menu.
Note 3 The exhaustive treatment of the logical block (Block 1) function may be found in the “Logic Block” paragraph inside
CONTROL AND MONITOR-
ING
section.
all-F59N.ai
Logic diagram concerning the residual overvoltage element - 59N
U
E
UE> Element
UE>> Element
Start U>>
Start UE>>
Start UE>
Trip UE>
Trip UE>>
&
UE> disbyUE>>
U> inhibition
t
UE> def
t
UE> inv
UE>
def
t
UE>> def
t
UE>>RES
t
UE>RES
UE>>
def
UE>
inv
UE> Curve
UE> Enable
State
Block1
BLK1UE>
&
UE>BLK1
Start UE>
&
Block1
BLK1UE>>
&
UE>>BLK1
Start UE>>
&
UE>BF
Trip UE> &
UE>BF
&
U
E
&
74VText-Block
74VText-Block
74VText-Block
&
74VText
U
E
Common configuration
3Votype59 N
74VText59 N
U
E
(direct measure)
U
EC
(calculated measure)
Timers-F59N.ai
UE> Start
UE> Trip
t
UE>
t
UE>
RESET
INPUT
t
UE>RES
t
UE>RES
t
UE>RES
t
Timers concerning the first element of residual overvoltage protection- 59N
