Basler BE1-50/51B-101 Instruction Manual

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Basler BE1-50/51B-101 Instruction Manual Manual pdf 17 page image

9252000991 Rev N BE1-50/51B General Information 1-75 Ampere Unit PickupSetting Range: 1 to 99 AacSetting Increment: 1 AacAccuracy: ±2%, ±25 milliamperes at or above 1.0 ampere settingDropoutDropout occurs at 95% of pickup value.Curve CharacteristicsBE1-50/51B instantaneous characteristic curves are similar to standard electromechanical instantaneousunits. However, the time to trip for ground applications is slightly longer than that for phase applications toallow time to power up the relay. Longer trip time for ground applications is beneficial because it helps toavoid nuisance trips.For phase applications, the maximum time to trip is 3.5 cycles at a pickup multiple of 1.0, and 1.5 cyclesat a pickup multiple of 3.0. The corresponding times for ground applications are 4.5 and 1.75 cycles.Figure 1-3 shows the instantaneous characteristic curves for maximum time to trip.On 100 series relays, additional delays of 0.1, 0.2, or 0.3 seconds may be added with internal switchesSW3-2 and SW3-3. These delays apply to both phase and ground applications. Closing switch SW3-2provides an additional delay of 0.1 second. Closing switch SW3-3 provides an additional delay of 0.2second. Closing both switches SW3-2 and SW3-3 provides an additional delay of 0.3 second. Section 2illustrates the location of SW3.On 200 series relays, an additional delay of 0.1 second may be added with internal switch SW3-2. Thisdelay applies to both phase and ground applications. Closing switch SW3-2 provides the additional delayof 0.1 second.Figure 1-3. Instantaneous Characteristic Curveswww . ElectricalPartManuals . com