Basler Electric BE1-51 Time Overcurrent Relay

INTRODUCTION

Three-input BE3 temperature relays use resistance

temperature detectors (RTDs) to monitor remote

temperatures. When any of three monitored temperatures

exceeds a preset limit, the corresponding relay output

operates. A dc metering output indicates the highest

temperature of the three RTDs. BE3 temperature relays are

available for use with 10 Ω copper or 100 Ω platinum RTDs.

OPERATION

Three temperatures are monitored through RTDs connected

at the nine-position front panel connector. RTD connections

are labeled A, B, and C. Three user-adjustable controls are

located on the front panel: SET 1. SET 2. and SET 3. Each

setpoint is adjustable from 50 to 100% (±3%) of the RTD

temperature range. When a setpoint is exceeded, the

corresponding TRIP LED lights and the relay output

energizes. Each RTD has a corresponding LED to identify

which RTD has exceeded the temperature setpoint. For

example, if the temperature of RTDs B and C exceeds the

trip level, the B and C TRIP LEDs light and the relay output

energizes. A green LED labeled AUX indicates the power

supply status. Figure 1 illustrates the BE3-49R controls,

indicators, and terminals.

VThe SR4A Retrofit Voltage Regulator is an economical, direct replacement

for existing Basler Electric SR4A voltage regulators. Designed for brush

and brushless synchronous generators, it delivers accurate voltage

regulation, dependable excitation control, and fast response times while

fitting within the same mounting footprint as the original regulator. 

The retrofit package incorporates a modern AVC63-12 voltage regulator

and, where required, an internal sensing module, making installation

quick and straightforward.

Engineered for reliable operation in demanding power generation

environments, the SR4A Retrofit supports single- or three-phase sensing,

reactive droop compensation, line drop compensation, underfrequency

protection, and integration with power factor controllers, excitation limiters,

and auto synchronizers. Its rugged construction, ease of installation, and

compatibility with existing generator systems make it an ideal solution for

extending equipment life and improving voltage regulation performance.

The SR and SSR Retrofit Voltage Regulators are designed as economical,

direct replacement solutions for legacy Basler SR and SSR voltage regulators.

Engineered for quick installation, these retrofit kits fit into the existing

mounting space and utilize terminal-to-terminal wiring to simplify field

replacement. Integrated CT input burden matching supports paralleling

systems with cross-current compensation, while accessory inputs provide

compatibility with var/power factor controllers and excitation limiters.

The SR and SSR Retrofit series delivers the same dependable performance

as the original regulators while helping extend the life and reliability of

generator excitation systems.

The SCP 250 controls generator (SCP 250-G) or motor (SCP 250-M) power

factor or vars by monitoring the voltage and current and supplying a control

input to a voltage regulator.

When the SCP 250 is controlling vars, the voltage regulator (or static exciter)

output changes to attain the selected reactive load current.

When the SCP 250 is controlling power factor, the voltage regulator adjusts

the excitation until the selected power factor is obtained.

The SCP 250 monitors the open/closed state of the circuit breaker so that

the voltage regulator controls excitation when the breaker is open and the

SCP 250 controls excitation when the breaker is closed.

A voltage limiting feature in the SCP 250 prevents the voltage regulator from

supplying full or no excitation if utility power is lost and the peaking generator

main breaker remains closed. Voltage limiting is adjustable between ±10%

and ±30%.