Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions 8-25
SEL-351 Instruction Manual
the new active setting group. Demand current pickup settings PDEMP, NDEMP,
GDEMP, and QDEMP can be changed without affecting the demand meters.
The examples in this section discuss demand current, but MW and MVAR demand values
are also available, as stated at the beginning of this subsection.
The demand current pickup settings in Table 8.3 are applied to demand current meter outputs as
shown in Figure 8.13. For example, when residual ground demand current I
G(DEM)
goes above
corresponding demand pickup GDEMP, Relay Word bit GDEM asserts to logical 1. Use these
demand current logic outputs (PDEM, NDEM, GDEM, and QDEM) to alarm for high loading or
unbalance conditions. Use in other schemes such as the following example.
Figure 8.13: Demand Current Logic Outputs
Courtesy of NationalSwitchgear.com
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