Model and Style Number

Electrical characteristics and operational features included in a specific relay

are defined by a combination of letters and numbers that make up the style

number. Model number BE1-46N designates the relay as a Basler Electric

Negative Sequence Overcurrent Relay. The model number, together with

the style number, describes the options included in a specific device and

appears on the front panel, draw-out cradle, and inside the case assembly.

The positive sequence component of current (I1) represents the portion of

the total current which has normal phase rotation and produces no adverse

effect on the system. An ideally balanced system contains only positive

sequence phase currents and voltages.

The zero sequence component of current (I0) also has no adverse effect

on a three-phase, three-wire (no neutral connection) power system because

it produces no appreciable magnetic flux and causes no excessive heating

in the generator rotor or windings.