Power Factor Elements; Frequency Elements - Siemens SIMPRO-100 Instruction Manual

SIMPRO-100
4.6.4

Power Factor Elements

Setting Prompt
Power Factor Alarm
OFF, 0.05 – 0.99
Leading Pickup
Power Factor Alarm
0.05 – 0.99
Lagging Pickup
Power Factor Alarm
0.00 – 400.00 s
Time Delay
Power Factor Trip
OFF, 0.05 – 0.99
Leading Pickup
Power Factor Trip
0.05 – 0.99
Lagging Pickup
Power Factor Trip
0.00 – 400.00 s
Time Delay
Power Factor Element
0 – 15000 s
Arming Delay
Table 4.32 Power Factor Element Settings
When you apply the SIMPRO-100 Relay on a
synchronous motor, the Power Factor Element
Arming Delay disarms the power factor 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 Power Factor Element
Arming Delay expires, the Power Factor Alarm
and Power Factor Trip elements are enabled. If
the measured power factor falls below the leading
or lagging threshold for longer than the time delay
setting, the relay can issue an alarm or trip signal.
The power factor 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 Power Factor Alarm
Leading Pickup and Power Factor Trip Leading
Pickup settings to OFF.
PRIM-2400C
Setting Setting Name =
Range Factory Default
55LDAP = OFF
55LGAP = 0.05
55AD = 2.50
55LDTP = OFF
55LGTP = 0.05
55TD = 5.00
55DLY = 10
4.6.5

Frequency Elements

Setting
Setting Range
Prompt
Level 1
OFF, 20.00 – 70.00 Hz
Pickup
Level 1 Time
0.03 – 400.00 s
Delay
Level 2
OFF, 20.00 – 70.00 Hz
Pickup
Level 2 Time
0.03 – 400.00 s
Delay
Level 3
OFF, 20.00 – 70.00 Hz
Pickup
Level 3 Time
0.03 – 400.00 s
Delay
Table 4.33 Frequency Element Settings
The SIMPRO-100 Relay provides three over- or
under-frequency elements with independent
pickup and time-delay settings. When an element
pickup setting is less than the Nominal Frequency
setting, the element operates as an
under-frequency element. When the pickup
setting is greater than the Nominal Frequency
setting, the element operates as an over-
frequency element.
The relay measures system frequency for these
elements using the A-phase voltage. All three
elements are disabled if the applied ac voltage
magnitude drops below 20 V.
Settings Calculation
Setting Name =
Factory Default
81D1P = 59.10
81D1D = 0.03
81D2P = OFF
81D2D = 0.03
81D3P = OFF
81D3D = 0.03
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