Schweitzer Engineering Laboratories SEL-421-4 - Figure 6.53 Protection Free-Form SEL OGIC Control Equations

6.178
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Applications Examples
230 kV Tapped Transmission Line Application Example
6: PSV01 := V1M >= 119.500 # 90% OF 230 KV DIVIDED BY SQRT 3
7: ###
8: ### SET CONTROL VARIABLE 2
9: ### ASSERTS WHEN PRIMARY POSITIVE SEQUENCE VOLTAGE IS
10: ### LESS THAN 20% OF NOMINAL
11: PSV02 := V1M < 26.500 # 20% OF 230 KV DIVIDED BY SQRT 3
12: ###
13: ### SET LATCH 1
14: PLT01S := R_TRIG PST02Q AND NOT PLT01 # SET LATCH WITH TIMER 2 OUTPUT
15: PLT01R := R_TRIG PST03Q AND PLT01 # RESET LATCH WITH TIMER 3 OUTPUT
16: ###
17: ### SET SEQUENCING TIMER 1
18: ### TIMES IF PSV02 IS ASSERTED, BREAKER 1 AND 2 ARE OPEN, AND
19: ### THE MOD IS CLOSED. RESETS IF PSV02 IS NOT ASSERTED, OR BREAKER
20: ### 1 OR 2 IS CLOSED, OR MOD IS OPEN, OR TIMER 1 OUTPUT ASSERTED
21: PST01PT := 150.00 # TIMER 1 PICKUP 150 CYCLES
22: PST01R := NOT PSV02 OR NOT IN101 OR NOT IN102 OR IN103 OR PST01Q
23: PST01IN := PSV02 AND IN101 AND IN102 AND NOT IN103
24: ###
25: ### SET SEQUENCING TIMER 2
26: ### TIMES IF PSV02 IS ASSERTED AND THE MOD IS OPEN. RESETS IF
27: ### LATCH 1 IS SET
28: PST02PT := 780.00 # TIMER 2 PICKUP 780 CYCLES
29: PST02R := PLT01
30: PST02IN := PSV02 AND IN103
31: ###
32: ### SET SEQUENCING TIMER 3
33: ### TIMES IF PSV01 IS ASSERTED AND BREAKER 1 AND 2 ARE OPEN
34: ### RESETS WHEN LATCH 1 IS RESET
35: PST03PT := 3600.00 # TIMER 3 PICKPUP 3600 CYCLES
36: PST03R := NOT PLT01
37: PST03IN := PSV01 AND IN101 AND IN102
38: ###
39: ### SET SEQUENCING TIMER 4
40: ### TIMES IF PSV01 IS ASSERTED AND BREAKER 1 AND 2 ARE OPEN
41: ### THE MOD IS OPEN, AND LATCH 1 IS NOT SET. RESET IF PSV01 NOT
42: ### ASSERTED, OR BREAKER 1 OR 2 NOT OPEN, OR MOD NOT OPEN
43: ### OR LATCH 1 SET, OR TIMER 4 OUTPUT ASSERTED
44: PST04PT := 330.00 # TIMER 4 PICKUP 330 CYCLES
45: PST04R := NOT PSV01 OR NOT IN101 OR NOT IN102 OR NOT IN103 OR PLT01 OR \
PST04Q
46: PST04IN := PSV01 AND IN101 AND IN102 AND NOT PLT01 AND IN103
47: ###
48: ### SET COUNTER 1
49: ### MOD TRIP ANTI-PUMP, TWO TRIPS WITHOUT AN OPEN LOCKS OUT TRIP
50: PCN01PV := 2.00 # A TWO COUNT COUNTER
51: PCN01R := IN103 # AN OPEN MOD RESETS COUNTER
52: PCN01IN := OUT103 # COUNTS ON THE RISING EDGE OF AN MOD TRIP
53: ###
54: ### SET COUNTER 2
55: ### MOD CLOSE ANTI-PUMP, TWO CLOSES WITHOUT A CLOSE LOCKS OUT CLOSE
56: PCN02PV := 2.00 # A TWO COUNT COUNTER
57: PCN02R := NOT IN103 # A CLOSED MOD RESETS THE COUNTER
58: PCN02IN := OUT106 # COUNTS ON THE RISING EDGE OF AN MOD CLOSE
Figure 6.53 Protection Free-Form SELOGIC Control Equations (Continued)