701 Motor Protection Relay Date Code 20010719
Settings Calculation
Voltage-Based Protection (Relay Models 0701001X & 0701011X)
4.38
Phase-to-Neutral Under- & Overvoltage Elements
Table 4.28 Under- and Over voltage Setting s, Phase-to-Ne utral Potent ials
When you connect the SEL-701 Relay voltage inputs to phase-to-neutral
connected VTs, as in Figure 2.6 on page 2.7 in Section 2: Installation or Figure 2.9 on
page 2.9 in Section 2: Installation, the relay provides two levels of phase-to-neutral
overvoltage and undervoltage elements, plus a residual overvoltage element. The
residual overvoltage element operates using the phasor sum of the three phase voltages
and is hidden and disabled if only a single phase-to-neutral VT is connected to the
relay. You may use these elements for tripping, alarming, or supervision of other
conditions through the relay programmable logic described in Appendix B: SELogic®
Control Equations & Relay Logic. To disable any of these elements, set the pickup
settings equal to OFF. The default 27P1P setting provides undervoltage supervision for
the underpower, reactive power, and power factor tripping elements.
Reactive Power (VAR) Elements
Table 4.29 Re active Power Elem ent Settings
Table 4.28 Under- and Overvoltage
Settings, Phase-to-Neutral Potentials
Setting Prompt
Setting Range
Setting Name =
Factory Default
Level 1 Phase U/V Pickup OFF, 1–300 V 27P1P = 40
Level 2 Phase U/V Pickup OFF, 1–300 V 27P2P = OFF
Level 1 Phase O/V Pickup OFF, 1–300 V 59P1P = 73
Level 2 Phase O/V Pickup OFF, 1–300 V 59P2P = OFF
Residual O/V Pickup OFF, 1–300 V 59GP = OFF
Table 4.29 Reactive Power Element Settings
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.
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