P.2.5
Date Code 20151029 Protection Manual SEL-411L Relay
Installation
Shared Configuration Attributes
Control Inputs
Optoisolated
The relay inputs on the optional I/O interface boards (INT2, INT7, INTC,
INTD, or INTE I/O boards—see Models and Options on page P.1.5), are
fixed pickup threshold, optoisolated, control inputs. The pickup voltage level
is determined for each board at ordering time.
NOTE: The INT2, INT7, INTC, INTD,
and INTE I/O interface boards have
optoisolated contact inputs that can
be used in either polarity.
Use these inputs for monitoring change-of-state conditions of power system
equipment. These high-isolation control inputs are ground-isolated circuits
and are not polarity sensitive. In other words, the relay will detect input
changes with voltage applied at either polarity.
Inputs can be independent or common. Independent inputs have two separate
ground-isolated connections, with no internal connections among inputs.
Common inputs share one input leg in common; all input legs of common
inputs are ground isolated. Each group of common inputs is isolated from all
other groups.
Nominal current drawn by these inputs is 8 mA or less with 5 voltage options
covering a wide range of voltages, as listed in Control Inputs on page P.1.14.
You can debounce the control input pickup delay and dropout delay separately
for each input, or you can use a single debounce setting that applies to all the
contact input pickup and dropout times—see Global Settings on page P.5.4.
AC Control Signals
Optoisolated control inputs can be used with ac control signals, within the
ratings shown in Control Inputs on page P.1.14. Specific pickup and dropout
time-delay settings are required to achieve the specified ac thresholds, as
shown in Table 2.1.
It is possible to mix ac and dc control signal detection on the same interface
board with optoisolated contact inputs, provided that the two signal types are
not present on the same set of combined inputs. Use standard debounce time
settings (usually the same value in both the pickup and dropout settings) for
the inputs being used with dc control voltages.
The recognition times listed in Table 2.1 are only valid when:
➤ The ac signal applied is at the same frequency as the power
system.
➤ The signal is within the ac threshold pickup ranges defined in
Optoisolated (Use With AC or DC Signals) on page P.1.14.
➤ The signal contains no dc offset.
Table 2.1 Required Settings for Use With AC Control Signals
Global Settings
a
a
First set Global setting EICIS := Y to gain access to the individual input pickup and dropout
timer settings.
Description Entry
b
b
These are the only setting values that SEL recommends for detecting ac control signals.
Other values may result in inconsistent operation.
Relay Recognition Time
for AC Control Signal
state change
INnmmPU
c
c
mm is number of available contact inputs depending on the type of board.
Pickup Delay 0.1250 cycles 0.625 cycles maximum
(assertion)
IN3mmDO
c
Dropout Delay 1.0000 cycle 1.1875 cycles maximum
(deassertion)
To Next Page
Loading...
