G-10 Setting
SEL
OGIC
®
Control Equation
s
Date Code 990430
SEL-351P Manual Técnico
Under the
SHO Command (Show/View Settings)
in
Section 10: Serial Port Communications
and Commands
, note that a number of the factory SEL
OGIC
Control Equation settings are set
directly to 1 or 0.
The individual SEL
OGIC
Control Equation settings explanations (referenced in Settings Sheets
13 through 17 at the end of
Section 9: Setting the Recloser Control
) discuss whether it makes
logical sense to set the given SEL
OGIC
Control Equation setting to 0 or 1 for certain criteria.
Set SEL
OGIC
Control Equations Directly to 1 or 0 – Example
Of special concern are the SEL
OGIC
Control Equation torque control settings 67P1TC through
51QTC for the overcurrent elements. The factory settings shipped with the SEL
-
351P in a
standard relay shipment, are all set directly to logical 1. See these factory settings in
SHO
Command (Show/View Settings)
in
Section 10: Serial Port Communications and Commands
.
If one of these torque control settings is set directly to logical 1
e.g., 51P1TC = 1
(set directly to logical 1)
then the corresponding overcurrent element (e.g., phase time-overcurrent element 51P1T) is
subject only to the directional control. See Figure 3.14 in
Section 3: Overcurrent, Voltage,
Synchronism Check, Frequency, and Power Elements
for phase time-overcurrent element
51P1T logic.
If the directional control enable setting E32 = N (and 51P1TC = 1), then time-overcurrent
element 51P1T is enabled (assuming pickup setting 51P1P is made) and nondirectional.
SEL
OGIC
Control Equation Limitations
Any single SEL
OGIC
Control Equation setting is limited to
15
Relay Word bits that can be
combined together with the SEL
OGIC
Control Equation operators listed in Table APPENDIX G:
.1. If this limit must be exceeded, use a SEL
OGIC
Control Equation variable (SEL
OGIC
Control
Equation settings SV1 through SV12) as an intermediate setting step.
For example, assume that the trip equation (SEL
OGIC
Control Equation trip setting TR) needs
more than 15 Relay Word bits in its equation setting. Instead of placing all Relay Word bits into
TR, program some of them into the SEL
OGIC
Control Equation setting SV1. Next, use the
resultant SEL
OGIC
Control Equation variable output (Relay Word bit SV1) in the SEL
OGIC
Control Equation trip setting TR.
Note in Table APPENDIX G: .2 that the SEL
OGIC
Control Equation variables (SEL
OGIC
Control
Equation settings SV1 through SV16) are processed after the trip equation (SEL
OGIC
Control
Equation trip setting TR). Thus, any tripping via Relay Word bits SV1 through SV16 can be
delayed as much as 1/4 cycle. For most applications, this is probably of no consequence.
All the SEL
OGIC
Control Equation settings have a combined limit of
330
Relay Word bits that
can be combined together with the SEL
OGIC
Control Equation operators listed in
OGIC
Control Equation settings that are set directly to 1 (logical 1)
or 0 (logical 0) also have to be included in this combined limit of 330 Relay Word bits – each
such setting counted as one Relay Word bit.
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