BE1-32R, -32 O/U GENERAL INFORMATION
1-3
Figure 1-3. Power Relay Start/Stop Control
Example 3, Generator Overload
When excessive load has been connected to a generating system, the directional power relay can initiate
corrective action. Corrective action could be energizing an alarm to alert the station operator. For automated
systems, corrective action could be initiating the sequence to either shed noncritical load or to start and parallel
an in-house generator to assume the excess load.
Example 4, Intertie
Another typical use of the directional power relay, addressing excessive load, concerns distribution protection,
see Figure 1-4. A high voltage bus supplies two transformers (T1 and T2). Both transformers (T1 and T2) can
supply all connected load, however, neither T1 nor T2 alone can supply the total load. The BE1-32 O/U,
over/underpower directional relays can protect this distribution system by providing overload protection for each
transformer (overpower function) or by sensing power flow through the transformers (reverse power function)
in an undesired direction.
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