701 Motor Protection Relay
Date Code 20010719
Settings Calculation
Voltage-Based Protection (Relay Models 0701001X & 0701011X)
4.40
Power Factor Elements
Table 4.31
Power Factor Element Settings
When you apply the SEL-701 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 on page 8.6 in Section 8: Metering & Monitoring
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.
Table 4.31
Power Factor Element Settings
Setting Prompt
Setting Range
Setting Name =
Factory Default
Power Factor Alarm Leading Pickup
OFF, 0.05–0.99
55LDAP = OFF
Power Factor Alarm Lagging Pickup
0.05–0.99
55LGAP = 0.05
Power Factor Alarm Time Delay
0.00–400.00 s
55AD = 2.50
Power Factor Trip Leading Pickup
OFF, 0.05–0.99
55LDTP = OFF
Power Factor Trip Lagging Pickup
0.05–0.99
55LGTP = 0.05
Power Factor Trip Time Delay
0.00–400.00 s
55TD = 5.00
Power Factor Element Arming Delay
0–15000 s
55DLY = 10
Содержание SEL-701
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