Date Code 20010719 701 Motor Protection Relay
Settings Calculation
Voltage-Based Protection (Relay Models 0701001X & 0701011X)
4.37
Voltage-Based Protection
(Relay Models 0701001X & 0701011X)
When you purchase the SEL-701 Relay with optional voltage inputs, the relay
enables a number of additional protection functions. The settings for these functions
are described below.
Under- & Overvoltage Elements
Phase-to-Phase Under- & Overvoltage Elements
Table 4.27 Un der- and Overvolta ge Settings, Pha se-to-Phase P otentials
When you connect the SEL-701 Relay voltage inputs to phase-to-phase connected
VTs, as in Figure 2.7 on page 2.8 in Section 2: Installation or Figure 2.8 on page 2.9 in
Section 2: Installation, the relay provides two levels of phase-to-phase overvoltage and
undervoltage elements. 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.
Table 4.27
Under- and Overvoltage
Settings, Phase-to-Phase Potentials
Setting Prompt
Setting Range
Setting Name =
Factory Default
Level 1 Phase-phase U/V Pickup OFF, 1–300 V 27P1P = 40
Level 2 Phase-phase U/V Pickup OFF, 1–300 V 27P2P = OFF
Level 1 Phase-phase O/V Pickup OFF, 1–300 V 59P1P = 73
Level 2 Phase-phase O/V Pickup OFF, 1–300 V 59P2P = OFF
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