14.18
SEL-311C Relay Instruction Manual Date Code 20060320
Application Settings for SEL-221 Series Relays
SEL-221H to SEL-311C Settings Conversion Guide
SEL-221H to SEL-311C Settings Conversion Guide
Set APP = 221H in the SEL-311C to configure the relay to closely
approximate the features, performance, and settings of an SEL-221H. When
APP = 221H, SEL-311C:
1. Configures itself as a compensator distance relay for phase
faults and a ground directional overcurrent relay for ground
faults using Permissive Overreaching Transfer Tripping.
2. Configures contact inputs and contact outputs to emulate those
in an SEL-221H.
3. Presents the user only with those settings associated with
SEL-221H type features.
4. Automatically calculates all other settings required to simulate
an SEL-221H.
If additional capability is needed (e.g., M
IRRORED BITS or SELOGIC control
equations), the relay may be returned to the setting APP = 311C to make all of
the SEL-311C settings visible. It is important to remember that changing from
APP = 311C to APP = 221H changes settings in the SEL-311C. Changing
from APP = 221H to APP = 311C makes more SEL-311C settings visible.
The only settings that are modified are ESV, ELAT, and EDP. These three
settings are set to their maximum value of 16 so that no hidden settings are
modified. If SEL-311C functions are used after setting APP is changed from
221H to 311C, do not change setting APP back to 221H.
As described above, when setting APP = 221H, the user is presented only with
SEL-311C settings associated with the features found in an SEL-221H. This
section explains how to make those remaining SEL-311C settings directly
from the settings used in an SEL-221H.
There are mainly two kinds of settings in the SEL-311C. Relay settings are
settings for protective elements. SEL
OGIC settings are Boolean expressions
used to customize the logic of the SEL-311C. To set the SEL-311C to emulate
an SEL-221H, follow these four steps:
Step 1. Turn on the SEL-221H application setting by making setting
APP = 221H. See Application Settings on page 14.19.
Step 2. Convert the appropriate SEL-221H settings to SEL-311C
settings using the simple equations shown in Table 14.9. Be
sure to convert from primary quantities (SEL-221H settings) to
secondary quantities (SEL-311C settings). See
Convert SEL-221H Primary Quantities to SEL-311C
Secondary Quantities on page 14.19.
Step 3. For each Mask Logic setting in the SEL-221H shown in
Table 14.10, create an equivalent SEL
OGIC control equation
using the logical OR of each bit asserted in the mask, as shown
in Table 14.11.
Step 4. Test the relay to verify intended performance.
The remainder of this section shows how to perform Step 1 through Step 3
above, and also gives an example of Step 3.
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