P.2.7
Date Code 20151029 Protection Manual SEL-411L Relay
Installation
Shared Configuration Attributes
similar to the standard control outputs, except that the hybrid outputs can
break current as great as 10 A. Hybrid contact outputs have a maximum
voltage rating of 330 Vdc.
The maximum pickup time for the hybrid control outputs is 6 ms. Figure 2.4
shows a representative connection for a Form A hybrid control output on the
main board I/O terminals.
Figure 2.4 Hybrid Control Output Connection
See Section 1: Introduction and Specifications, for complete hybrid control
output specifications.
Short transient inrush current can flow at the closing of an external switch in
series with open high-current interrupting contacts. This transient will not
energize the circuits in typical relay-coil control applications (trip coils and
close coils), and standard auxiliary relays will not pick up. However, an
extremely sensitive digital input or light-duty, high-speed auxiliary relay can
pick up for this condition. This false pick-up transient occurs when the
capacitance of the high-speed, high-current interrupting output circuitry
charges (creating a momentary short circuit that a fast, sensitive device sees as
a contact closure). When using I/O boards other than INTE, avoid possible
false pickups of the output contact by connecting an external resistor across
the output contact (see the INTE high-speed, high-current interrupting and the
INTC high-speed, high-current output discussions for more details).
High-Speed, High-Current Interrupting Polarity Sensitive Control Outputs
NOTE: You can use only dc circuits
with high-speed, high-current
interrupting polarity sensitive
outputs.
In addition to the standard control outputs and the hybrid control outputs, the
INTC and INTE I/O interface boards offer high-speed, high-current
interrupting polarity sensitive control outputs. These control outputs have a
resistive load pickup time of 10 s (microseconds), which is much faster than
the 6 ms pickup time of the standard and hybrid control outputs. The
high-speed, high-current interrupting control outputs drop out at a maximum
time of 8 ms. The maximum voltage rating is 330 Vdc. See Control Outputs
on page P.1.13, for complete high-speed, high-current interrupting control
output specifications.
Figure 2.5 shows a representative connection for a Form A high-speed,
high-current interrupting control output on the INTE I/O interface terminals.
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