Thytronic XMR-V 4V User Manual

114
FUNCTION CHARACTERISTICS
— Directional active underpower - 37P
Preface
The active power is calculated as:
P=U
L1
I
L1L
cosf
L1
+ U
L2
I
L2L
cosf
L2
+U
L3
I
L3L
cosf
L3
where:
• U
L1
, U
L2
, U
L3
are the fundamental components of the phase-to-neutral voltages
• II
L1L
, I
L2L
, I
L3L
are the fundamental components of the side L phase currents
• cosf
L1
, cosf
L2
, cosf
L3
are the phase power factors
f
L1
, f
L2
, f
L3
, are the displacement angles of phase currents I
L1
, I
L2
, I
L3
respect to the phase voltages
U
L1
, U
L2
, U
L3
, (positive when lag currents compared the phase voltages).
For the conventions on the active power sign please refer to the wiring diagram.
Operation and settings
The element is enabled for start and trip on the base of the direction setting for the two independent-
ly programmable thresholds.
User can disable the 37P protection threshold from the keyboard. During this command, the trip
output relay (U <and / or U << thresholds) are forced to reset state, the message “Disabled 27-27V1-
37P-37Q” is displayed and all LEDs blink until the end of the command.
P1< Tripping direction:
PForward:
P1< Tripping direction: PReverse:
P1< Tripping direction: PForward/Reverse:
P
Q
TRIP
P
1
<
P1< Tripping direction: P Forward:
General operation time characteristic for the directional active underpower element - 37P
P
Q
TRIP
P
1
<
P1< Tripping direction: P Reverse:
General operation time characteristic for the directional active underpower element - 37P
P
Q
TRIP
P
1
<
P
1
<
P1< Tripping direction: P Forward/Reverse:
General operation time characteristic for the directional active underpower element - 37P
XMR-D EQUIPMENT MANUAL
Ed. 2.9 - 02/2021

Thytronic XMR-V 4V Specifications

General

Brand	Thytronic
Model	XMR-V 4V
Category	Protection Device
Language	English