Basler Electric BE1-60 Voltage Balance C1F A1P D0C3F Solid Relay

The IFM-150 Interface Firing Module receives a control signal

from the DECS-400 or DECS-450 Digital Excitation Control

System and then calculates a time delay based on the zero

crossing of each phase of voltage from the synchronizing

transformer. At the end of the time delay, the IFM-150 produces

the properly synchronized sets of pulses to drive the SCRs of

the excitation system rectifier chassis. As the DECS control

signal increases (or decreases), the time interval between the

zero crossing of each phase voltage and the start of its next

output pulse will decrease (or increase).

This results in an increase (or decrease) in the rectifier chassis

output voltage.

A terminal voltage limiter within the IFM-150 can be enabled to

monitor the generator voltage through the  synchronizing

transformer or external voltage transducer and compare the

measurement with a user adjustable reference level.

If the generator voltage exceeds the reference level for a user

-adjustable amount of time, the IFM-150 will modify the SCR

firing pulses and limit the generator voltage.

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.