10.13
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Testing and Troubleshooting
Acceptance Testing
Step 5. Purpose: Repeat the test for each definite-time and inverse-time
overcurrent element, for each winding.
Method:
a. Repeat Step 1 through Step 4 for each time element
listed in Table 10.3 for each winding.
b. Remember to set the SER for the appropriate elements
and apply current to the appropriate winding.
Phase Overcurrent Elements
The SEL-387 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 previously outlined in this section.
Table 10.3 Time-Delayed Overcurrent Elements and Corresponding Settings
Winding 1 Winding 2 Winding 3 Winding 4
Bit Setting Bit Setting Bit Setting Bit Setting
Phase Level 1 50P11 50P11P 50P21 50P21P 50P31 50P31P 50P41 50P41P
Definite-Time 50P11T 50P11D 50P21T 50P21D 50P31T 50P31D 50P41T 50P41D
Phase Inverse-Time 51P1 51P1P 51P2 51P2P 51P3 51P3P 51P4 51P4P
Curve 51P1C 51P2C 51P3C 51P4C
Time-Dial 51P1TD 51P2TD 51P3TD 51P4TD
Time-Out 51P1T 51P2T 51P3T 51P4T
Residual Level 1 50N11 50N11P 50N21 50N21P 50N31 50N31P 50N41 50N41P
Definite-Time 50N11T 50N11D 50N21T 50N21D 50N31T 50N31D 50N41T 50N41D
Residual Inverse-Time 51N1 51N1P 51N2 51N2P 51N3 51N3P 51N4 51N4P
Curve 51N1C 51N2C 51N3C 51N4C
Time-Dial 51N1TD 51N2TD 51N3TD 51N4TD
Time-Out 51N1T 51N2T 51N3T 51N4T
Neg-Seq Level 1 50Q11 50Q11P 50Q21 50Q21P 50Q31 50Q31P 50Q41 50Q41P
Definite-Time 50Q11T 50Q11D 50Q21T 50Q21D 50Q31T 50Q31D 50Q41T 50Q41D
Neg-Seq Inv-Time 51Q1 51Q1P 51Q2 51Q2P 51Q3 51Q3P 51Q4 51Q4P
Curve 51Q1C 51Q2C 51Q3C 51Q4C
Time-Dial 51Q1TD 51Q2TD 51Q3TD 51Q4TD
Time-Out 51Q1T 51Q2T 51Q3T 51Q4T
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