APPLICATION EXAMPLES

The BE1-32 relays (R and O/U) are typically used in

applications where excessive power flow in the tripping

direction is indicative of undesirable situations. Typical

examples are discussed below. Notice: This product is

not recommended for power factors below 0.10. Contact

Basler Electric for recommended products.

EXAMPLE 1 – ANTI MOTORING

In this example, the power relay is used to protect the

prime mover rather than the generator. When an ac

generator, operating in parallel with a power system,

loses prime mover torque, it remains in synchronism

with the system and continues to run as a synchronous

motor drawing sufficient power from the system to drive

the prime mover. Sustained motoring can cause severe

damage to the prime mover. The Directional Power

Relay, with its wide sensitivity range, can detect levels of

reverse real power flow as low as 0.5 Watts secondary

and provide an alarm or trip the unit off line (See Figure

1). In this example, single phase sensing is usually

considered sufficient, since motoring is a balanced

condition.