Schweitzer Engineering Laboratories SEL-352-1 - Control Equations

Date Code 20010731 Control Logic 5-5
SEL-352-1, -2 Instruction Manual
86BF Trip and Reset Elements
69  M2D  M2  L1MQ  L1MR  L1MS  M1D  M1  M86T 
70  L3MQ  L3MR  L3MS  M3D  M3  L2MQ  L2MR  L2MS 
71  *  MER  86BFT  86RS  MDT  M4D  M4  * 
72  *  *  *  *  *  CTC  CTB  CTA 
Contact Output Elements and Display Points
73  !ALARM  OUT107  OUT106  OUT105  OUT104  OUT103  OUT102  OUT101 
74  OUT201  OUT202  OUT203  OUT204  OUT205  OUT206  OUT207  OUT208 
75  OUT209  OUT210  OUT211  OUT212  OUT213  OUT214  OUT215  OUT216 
76  OUT301  OUT302  OUT303  OUT304  OUT305  OUT306  OUT307  OUT308 
77  OUT309  OUT310  OUT311  OUT312  OUT313  OUT314  OUT315  OUT316 
78  DP8  DP7  DP6  DP5  DP4  DP3  DP2  DP1 
79  DP16  DP15  DP14  DP13  DP12  DP11  DP10  DP9
SELOGIC Control Equations
SEL
OGIC control equation settings create much of the logic structure of the relay. Certain
scheme settings fix the SEL
OGIC control equations to a predetermined logic implementation.
Select a predetermined scheme by turning it “ON” or selecting the scheme number in the
settings. After review of these default schemes, select “CUSTOM” to customize the schemes for
specific applications, if necessary. The diagrams in this section detail the predefined logic in the
relay. See Section 7: Setting the Relay for a list of the predetermined SEL
OGIC control equation
settings that may be customized.
SEL
OGIC control equation settings are written in Boolean algebra logic, combining Relay Word
bits or Analog Compares together with different operators. (Analog Compares are discussed
later in this section.) Parentheses can also be used in SEL
OGIC control equation settings. Use
more than one set of parentheses in a given SEL
OGIC control equation setting, but they cannot be
“nested” (parentheses within parentheses). Operators in a SEL
OGIC control equation setting are
processed as shown in Table 5.2:
Table 5.2: Processing Order of SEL
OGIC Control Equation Operators
Operator Logic Function
( ) parentheses
! NOT
/ rising-edge detect
\ falling-edge detect
* AND
+ OR
The rising-edge detect (/) and falling-edge detect (\) operators sense a transition of a Relay Word
bit from one state to another, and output a logical 1 for a single processing interval if the change
is detected. The rising-edge detect senses changes from 0 to 1, the falling-edge detect from
1 to 0. The new state must be in effect for one-quarter cycle to be recognized as a state change.
The rising- and falling-edge detect operators cannot be used with Analog Compares, and each
counts as two operators toward the maximum number of 550 (Group Setting Class) or 50 (Global
Setting Class).