Thytronic Pro-N NVA100X-D

FUNCTION CHARACTERISTICS
97
NVA100X-D - Manual - 02 - 2016
The element has two adjustable thresholds with time defi nite delay.
The active power is compared with the setting value (P
1
<
def
, P
2
<
def
) powers above the associated
pickup value are detected and a start is issued when the following conditions are met:
The circuit breaker is closed (if the control is enabled)
The t
ARM-P
< adjustable timer has expired started from the CB closure
If all conditions are still met, after expiry of the associated operate time (t
P1
<
def,
t
P2
<
def
) a trip com-
mand is issued; if instead the power exceed the threshold, the element is restored.
The elements can be enabled or disabled by setting ON or OFF the State parameter inside the Set
\ Profi le A(or B) \ Directional active underpower-37P \ P1< Element (P2< Element) \ Defi nite time
menu.
Enabling of the CB state control (ON or OFF of the CB-37P parameter) and adjustment of the wait-
ing time following the CB closing (tARM-P< parameter) maj be adjusted inside the Set \ Profi le A(or
B) \ Directional active underpower-37P \ P1< Element (P2< Element) \ Common confi guration menu.
The elements can be enabled or disabled by setting ON or OFF the State parameter inside the Set
\ Profi le A(or B) \ Directional active underpower-37P \ P1< Element (P2< Element) \ Defi nite time
menu.
Breaker failure (BF)
The 37P elements can produce the Breaker Failure output if the P1<BF, P2<BF parameters are set
to ON. The parameters are available inside the Set \ Profi le A(or B) \ Directional active underpower
- 37P \ P1< Element P2< Element) \ Setpoints menu.
[1]
VT supervision (74VT)
The protection element is blocked off whenever the VT or/and CT supervision func-
tion are active, so that no unwanted trip can arise if any fault on the VTs or/and CTs sec-
ondary circuits (break, fuse trip, etc) are detect;
[2]
the Block functions enable from
74VT and 74CT parameter (74VT-BK-EN and 74CT-BK-EN) are available inside the
Set \ VT supervision -74VT, and Set \ CT supervision -74CT menus
Logical block (Block1)
If the P1<BLK1 and/or P1<BLK1 enabling parameters is set to ON and a binary input is designed
for logical block (Block1), the protection is blocked 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 \ Profi le A(or B) \ Directional
active underpower - 37P \ P1< Element P2< Element) \ Setpoints menu, while the Block1 function
must be assigned to the selected binary input inside the Set \ Board1(2) inputs \ Binary input IN1-1...
INx-x menus.
All parameters can be set separately for A and B setting profi les.
Note 1 The common settings concerning the Breaker failure protection are adjustable inside the Breaker Failure - BF menu.
Note 2 The exhaustive treatment of the VT and CT supervision function may be found inside the CONTROL AND MONITORING section.
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.
•
•
P
P
1
<
t
t
P1
<
TRIP
P
1
<
TRIP
General operation time characteristic for the directional active power element - 37P (first element)
P
P
1
<
t
t
P1
<
TRIP
P
1
<
TRIP
General operation time characteristic for the directional active power element - 37P (first element)
&
P2<BF
P
2
< BF
P
2
< Trip
2nd Pickup Element
Block1
Block1
P
P
2
< Start
P
2
< Trip
1st Pickup Element
Common
Block1
Block1
P
P
1
< Start
P
1
< Trip
&
P1<BF
P
1
< BF
P
1
< Trip
P 1<DIR P1<def t
P1
<def P 2<DIR
CB-37P t
ARM-P<
P2<def t
P2
<def
General operation time characteristic for the directional active underpower elements - 37P
&
P2<BF
P
2
< BF
P
2
< Trip
2nd Pickup Element
Block1
Block1
P
P
2
< Start
P
2
< Trip
1st Pickup Element
Common
Block1
Block1
P
P
1
< Start
P
1
< Trip
&
P1<BF
P
1
< BF
P
1
< Trip
P 1<DIR P1<def t
P1
<def P 2<DIR
CB-37P t
ARM-P<
P2<def t
P2
<def
General operation time characteristic for the directional active underpower elements - 37P