14.25
Date Code 20060320 Instruction Manual SEL-311C Relay
Application Settings for SEL-221 Series Relays
SEL-221F to SEL-311C Settings Conversion Guide
SEL-221F to SEL-311C Settings Conversion Guide
Set APP = 221F in the SEL-311C to configure the relay to closely
approximate the features, performance, and settings of an SEL-221F. When
APP = 221F, the SEL-311C:
1. Configures itself as a phase and ground distance relay and a
ground directional overcurrent relay.
2. Performs reclosing and synchronism check functions.
3. Configures contact inputs and outputs to emulate those in an
SEL-221F.
4. Presents the user only with those settings associated with
SEL-221F type features.
5. Automatically calculates all other settings required to simulate
an SEL-221F.
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 = 221F changes settings in the relay. Changing from APP
= 221F 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 221F to
311C, do not change setting APP back to 221F.
As described above, when setting APP = 221F, the user is presented only with
SEL-311C settings associated with the features found in an SEL-221F. This
section explains how to make those remaining SEL-311C settings directly
from the settings used in an SEL-221F.
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-221F, follow these four steps:
Step 1. Turn on the SEL-221F application setting by making setting
APP = 221F. See Application Settings on page 14.26.
Step 2. Convert the appropriate SEL-221F settings to SEL-311C
settings using the simple equations shown in Table 14.13. Be
sure to convert from primary quantities (SEL-221F settings) to
secondary quantities (SEL-311C settings). See
Convert SEL-221F Primary Quantities to SEL-311C Secondary
Quantities on page 14.26.
Step 3. For each Mask Logic setting in the SEL-221F shown in
Table 14.14, create an equivalent SEL
OGIC control equation
using the logical OR of each bit asserted in the mask, as shown
in Table 14.15.
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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