Date Code 20080110 Testing and Troubleshooting 10-15
SEL-387E Instruction Manual
Table 10.2: Time-Delayed Overcurrent Elements and Corresponding Settings
Winding 1 Winding 2 Winding 3
Bit Setting Bit Setting Bit Setting
Phase Level 1 50P11 50P11P 50P21 50P21P 50P31 50P31P
Definite-Time 50P11T 50P11D 50P21T 50P21D 50P31T 50P31D
Phase Inverse-Time 51P1 51P1P 51P2 51P2P 51P3 51P3P
Curve 51P1C 51P2C 51P3C
Time-Dial 51P1TD 51P2TD 51P3TD
Time-Out 51P1T 51P2T 51P3T
Residual Level 1 50N11 50N11P 50N21 50N21P 50N31 50N31P
Definite-Time 50N11T 50N11D 50N21T 50N21D 50N31T 50N31D
Residual Inverse-Time 51N1 51N1P 51N2 51N2P 51N3 51N3P
Curve 51N1C 51N2C 51N3C
Time-Dial 51N1TD 51N2TD 51N3TD
Time-Out 51N1T 51N2T 51N3T
Neg-seq Level 1 50Q11 50Q11P 50Q21 50Q21P 50Q31 50Q31P
Definite-Time 50Q11T 50Q11D 50Q21T 50Q21D 50Q31T 50Q31D
Neg-seq Inv-Time 51Q1 51Q1P 51Q2 51Q2P 51Q3 51Q3P
Curve 51Q1C 51Q2C 51Q3C
Time-Dial 51Q1TD 51Q2TD 51Q3TD
Time-Out 51Q1T 51Q2T 51Q3T
Phase Overcurrent Elements
The SEL-387E Relay has many phase overcurrent elements. They all operate based on a
comparison between the phase current directly applied to the winding inputs and the phase
overcurrent setting. The elements that have a P as the third character of the element name
operate when any one of the three-phase currents exceeds the phase current setting threshold.
The elements that have an A, B, or C as the third character in the element name operate based on
that phase current.
Test the instantaneous and time-delayed phase overcurrent elements by applying current to the
inputs and comparing relay operation to the phase overcurrent settings. These tests were
outlined earlier in this section.
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