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Protective Relay Systems

Reliable real-time protection and control for critical power systems. Ensure operational safety, minimize downtime, and maintain system integrity with our advanced protective relay systems.
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Excitation Systems

Precise voltage control for reliable generator performance. Our excitation systems deliver accurate, responsive control of generator field voltage to ensure stability, reliability, and optimal performance across all operating conditions.
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Voltage Regulators

Consistent, stable voltage control for generators and power systems. Our voltage regulators maintain precise voltage output to protect equipment, enhance quality of power, and ensure system stability.
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Genset Controls

Our genset control systems offer complete command over engine and generator functions, delivering reliable automation, protection, and monitoring for your systems.
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Custom Transformers

Engineering-to-order transformers for specialized power applications. Our custom transformers are designed and built to meet your exact electrical, mechanical, and environmental requirements.
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Protective Relay Systems

BE1-87B, High Impedance Bus Differential Relay

The BE1-87B High Impedance Bus Differential Relay provides fast, dependable protection for high-impedance differential applications in utility and industrial power systems. Designed for optimum fault detection speed and selectivity, the relay features CT circuit diagnostics, steady-state unbalance monitoring, configurable timing options, and low-burden operation to enhance system reliability while helping prevent nuisance trips and misoperation. Available in multiple mounting configurations, the BE1-87B is an economical solution for bus differential protection and retrofit applications.

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BE1-87B High Impedance Bus Differential, M1 case
BE1-87B High Impedance Bus Differential, S1 case
BE1-87B High Impedance Bus Differential, Rack Mount Case
BE1-87B (9282300111) GE PVD21B and PVD21D Retrofit Relay
BE1-87B High Impedance Bus Differential, M1 case
BE1-87B High Impedance Bus Differential, S1 case
BE1-87B High Impedance Bus Differential, Rack Mount Case
BE1-87B (9282300111) GE PVD21B and PVD21D Retrofit Relay

— Product Features & Benefits

    • Proven high-impedance differential provides optimum speed and selectivity.
    • Space and cost-saving configurations available featuring a single-phase S1 case, a three-phase M1 case, and a three-phase 19″ rack-mount case.
    • Easily verify external wiring and prevent misoperation with the CT Circuit Diagnostic function and Steady-State Unbalance alarm.
    • Two timing options are available. Each includes a jumper-selectable instantaneous or intentional time delay.
      • Timing Option A1: The instantaneous jumper position provides fastest tripping. The 20 millisecond intentional delay jumper position prevents tripping for short duration faults within the zone of protection that is protected by a high speed fuse.
      • Timing Option A2: The instantaneous jumper position provides fastest tripping. The 2 millisecond intentional delay jumper position prevents nuisance tripping for very short duration faults such as nearby lightning strikes.
    • Reduced battery load with low burden power supply.
    • Easily perform in-case system and device tests using test paddles.
    • Available as a plug-n-play retrofit for GE PVD21B or PVD21D differential voltage relays. Fits into an existing M1 GE PVD case. Request Basler part number 9282300111.

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