Sel 411L - Table 3.45 Available Voltage Source-Selection Setting Combinations

P.3.111
Date Code 20151029 Protection Manual SEL-411L Relay
Protection Functions
Current and Voltage Source Selection
➤ Open-phase detection logic
➤ Inverse-time overcurrent elements
➤ Circuit breaker failure protection
➤ Circuit Breaker Monitor on page P.9.1
➤ Metering on page P.9.25
Polarizing current-source setting IPOL identifies the single current input
connected to a zero-sequence current source (e.g., transformer bank neutral).
This zero-sequence current is used as a reference in the zero-sequence current-
polarized directional element. Such a directional element is applied to ground
overcurrent elements (see Table 3.73 and Figure 3.89). Setting IPOL is not
used often and thus is usually set to NA. Notice that in Table 3.42–Table 3.44
there are relatively few scenarios where setting IPOL can be set to a current
channel selection (only those cases where three-phase current input IX is not
used for any other function). An example of using setting IPOL is found later
in this subsection.
Voltage Source
Switching and Uses
Refer to the Global settings in Table 5.14. Alternate voltage source switching
between VY and VZ in Figure 3.60 is more straightforward (as shown in
Table 3.45) than the preceding discussion on current-source
selection/switching (compare to Table 3.42–Table 3.44).
NA = not applicable.
Shaded cells indicate settings forced to given values and hidden.
SELOGIC setting ALTV controls the switching between voltages VY and VZ
for line voltage (assert setting ALTV to switch to designated alternate line
voltage ALINEV := VZ). Setting ALTV is automatically hidden and set to NA
if ALINEV := NA (no voltage switching can occur). Reasons for switching
from one three-phase voltage to another may be for loss-of-potential or bus
switching/rearrangement.
Default line voltage source VY and alternate line voltage source settings
(ALINEV and ALTV) identify the voltages used in the following
elements/features described later in this section and in other sections.
Table 3.45 Available Voltage Source-Selection Setting Combinations
NUMBK
(Number of
Breakers)
ESS
(Source
Selection)
Line Voltage
Source
ALINEV
(Alternate Line Voltage
Source)
1Y VY VZ or NA
1N VY
NA
11 VY VZ or NA
12 VY VZ or NA
13 not allowed
14 not allowed
2Y VY VZ or NA
2N VY
NA
21 not allowed
22 not allowed
23 VY VZ or NA
24 VY VZ or NA