Figure 8-2. Typical Logic Diagram for CDS240-BATX-A-BE Protection Elements
Referring to Figure 8-1, the 87 and 151 protection elements are connected to the high-side CT, input 1.
The 87 and 251 protection elements are connected to the low-side CT, input 2. The 51 protection element
(N only) is connected to a ground CT at the grounded side of a delta-wye transformer. The ground-input
(G) is an option on the BE1-CDS240 and must be ordered. Paralleled CTs inside a delta tertiary (3Io) can
also feed the 51N. The 87, 51, 151, and 251 protection elements are logic enabled by the settings shown
in Table 8-1 to provide a trip through the BE1-CDS240 output contacts. Protection elements set to 0 are
setting disabled and will not provide a trip output even if logic enabled.
Typically, the BE1-CDS240 would be applied with a BE1-851 or BE1-951 multifunction overcurrent relay
to provide independent, overlapping, backup protection in the event of a common mode failure. Typically,
the 87 protection element provides high-speed restrained differential and unrestrained differential phase
and ground protection for faults inside the differential zone. At the same time, it provides security against
mis-operations resulting from transformer inrush by restraining and preventing a trip in the presence of 2
nd
and 5
th
harmonics.
Typically, the 151 protection element is coordinated with the low-side bus protection to provide Phase,
Neutral, and Negative-Sequence timed backup protection for the low-side bus if the bus protection is out
of service.
Typically, the 251 protection element is coordinated with the low-side feeder protection to provide Phase,
Neutral, and Negative Sequence timed backup protection for feeder faults if the feeder protection is out of
service.
Typically, the 51N protection element is coordinated with the low-side bus and feeder protection to
provide Neutral (ground) timed backup protection for transformer low-side, bus and feeder ground faults if
any primary zone of protection is of service.
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BE1-CDS240 Application
8-5
Summary of Contents for BE1-CDS240
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