Thytronic DMC3S - Page 41

41
DMC3S - Manual - 08 - 2021
The function has two adjustable trip thresholds (P
1
>, P
2
>) which can be also be delayed (t
P1
>, t
P2
>),
with definite time characteristics.
Operating logic
When the measured active power exceeds the set threshold, the threshold itself starts (Start) and
the timer starts counting. If the condition persists, when the operating time expires, the threshold
trips (Trip), otherwise the threshold is reset.
Each threshold can be enabled or disabled.
An adjustable reset time can be set for each of the two thresholds (t
P1>RES
, t
P2>RES
).
Logical block (Block1)
If a logical input is configured with a logical block function and one or more thresholds of function
32P are enabled for that block (P1>BLK1 and/or P2>BLK1), the corresponding threshold is
blocked for the activation duration of the logical input itself. The trip timer is held in reset, so that the
trip time count starts only when the block signal expires.
[1]
The enable parameters can be set in Set \ Protections \ Directional active overpower - 32P \
Threshold P1, Threshold P2 > \ Parameters, while the logical block is assigned to the input in the
menu Set \ Input board inputs \ Input IN1-1, (Input IN1-x).
Functional block (Block3)
If the voltmetric measurement chain fails (function 74VT tripped) or amperometric measurement
chain fails (function 74CT tripped), all thresholds of protection 32P are blocked.
Note 1 For details, refer to the paragraph describing the MONITORING AND CONTROL FUNCTIONS “Logical block (Block1)”
P
P1>
t
tP1>
General characteristic of the operating time for the rst threshold of the directional active
maximum function (32P)
TRIP
P1>
TRIP
General functional diagram of the Directional active overpower function (32P)
Threshold P1> Threshold P2>
Block1
Block1
Block3 Block3
P
BF
P1> Start
P1> Trip
Block1
Block1
P
BF
P2> Start
P2> Trip
P1>DIR P1>def tP1>def P2>DIR P2>def tP2>def
tP1>RES tP2>RES
P1> Start
P1> Trip
RESET
INPUT
tP1>RES
tP1>def tP1>def
tP1>RES tP1>RES
t
Timers for the rst threshold of the active directional maximum power protection - 32P