Siemens SIMPRO-100 - Reactive Power (VAR) Elements; Table 4.30 Reactive Power Element Settings; Underpower Elements

4
Settings Calculation
SIMPRO-100
64 PRIM-2400C
4.6.2 Reactive Power (VAR)
Elements
Table 4.30 Reactive Power Element Settings
When you apply the SIMPRO-100 Relay on a
synchronous motor, the VAR Element Arming
Delay disarms the reactive power elements for a
settable time after the motor starts. This allows
the motor to be brought to full speed and the field
applied. After the VAR Element Arming Delay
expires, the VAR Alarm and VAR Trip elements
are enabled. If the positive or negative reactive
power exceeds the appropriate threshold for
longer than the time delay setting, the relay can
issue an alarm or trip signal. The reactive power
elements are disabled when the motor is stopped
or starting. These elements can be used to detect
synchronous motor out-of-step or loss-of-field
conditions.
Refer to Figure 8.1, page 113 for the relay power
measurement convention.
For application on an induction motor, disable the
elements by setting both the Negative VAR Alarm
Pickup and Negative VAR Trip Pickup settings to
OFF.
4.6.3 Underpower Elements
Table 4.31 Underpower Element Settings
The SIMPRO-100 Relay Underpower Element
Arming Delay disarms the underpower elements
for a settable time after the motor starts. This
allows the motor to be brought to full load. After
the Underpower Element Arming Delay expires,
the Phase Underpower Alarm and Phase
Underpower Trip elements are enabled. If the
real three-phase power falls below the alarm or
trip threshold for longer than the time delay
setting, the relay can issue an alarm or trip signal.
The underpower elements are disabled when the
motor is stopped or starting. These elements
operate in addition to the Load Loss function and
you can use them to detect motor load loss and
other underpower conditions.
Disable the elements by setting both the Phase
Underpower Alarm Pickup and Phase
Underpower Trip Pickup settings to OFF.
Setting
Prompt
Setting Range
Setting Name =
Factory Default
Negative VAR
Alarm Pickup
OFF, 30 – 2000 VAR
a
NVARAP = OFF
Positive VAR
Alarm Pickup
30 – 2000 VAR
a
PVARAP = 2000
VAR Alarm Time
Delay
0.00 – 400.00 s VARAD = 0.00
Negative VAR
Trip Pickup
OFF, 30 – 2000 VAR
a
NVARTP = OFF
Positive VAR
Trip Pickup
30 – 2000 VAR
a
PVARTP = 2000
VAR Trip Time
Delay
0.00 – 400.00 s VARTD = 0.00
VAR Element
Arming Delay
0 – 15000 s VARDLY = 10
a
Setting range shown for ITAP = 5 A. Range is 6 – 400 VAR when
ITAP = 1 A.
Setting Prompt Setting Range
Setting Name =
Factory Default
Phase Underpower
Alarm Pickup
OFF, 30
–
2000 W
a
37PAP = OFF
Phase Underpower
Alarm Time Delay
0.00
–
400.00 s 37PAD = 0.00
Phase Underpower
Trip Pickup
OFF, 30
–
2000 W
a
37PTP = OFF
Phase Underpower
Trip Time Delay
0.00
–
400.00 s 37PTD = 0.00
Underpower
Element Arming
Delay
0
–
15000 s 37DLY = 10
a
Setting range shown for ITAP = 5 A. Range is 6 – 400 W when
ITAP = 1 A.