Generator

GENERATOR OUTPUT CONTROL

The main characteristic of the plain shunt connected generator is that the output rises with increasing speed and if this were uncontrolled irreparable damage would be caused to the generator and the battery.

The systems currently used to control this output are:

1. Compensated Voltage Control

2. Current-Voltage Control.


COMPENSATED VOLTAGE CONTROL

It will be remembered that battery terminal voltage varies with the state of charge, so if we control the voltage of the generator at a specific level i.e. terminal voltage of a fully charged battery, then the pressure differential between the generator and the battery will be greatest when the battery is discharged allowing a high current to flow, reducing as the battery becomes charged, until theoretically the pressures will be equal and no current will flow,

If the battery was in a very low state of charge, the current flow could be extremely high, most probably higher than the generator could safely deliver, and the armature windings would be damaged. Because of this, we have to use some form of COMPENSATION.

At low speeds, the generator output is less than the battery voltage, so an automatic switch or cut-out is incorporated in the circuit to prevent the battery being discharged through the armature winding.


COMPENSATED VOLTAGE CONTROL
RB. 106 LUCAS

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Generator excitation control

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Basler Electric offers a broad range of specially designed accessories to enhance voltage regulator capabilities over a wide variance of specifications. Listed below is general information on these types, with specific applications covered in the Voltage Regulator Accessories Selector Chart that follows. For more information, download product bulletins by accessory model name or download the product manual.
Remote Display Panel (RDP-300)
The RDP-300 Remote Display Panel is a Human-Machine Interface (HMI) used with single or dual DECS-200, DECS-300 or DECS-400 based Digital Excitation Control Systems to provide remote control, to view metered quantities, and to provide annunciation of digital controller status and alarms.
Touch-sensitive 6" diagonal monitoring screen
Two-wire, RS-485 Modbus communication protocol
May be located up to 4000 feet away from the DECS unit
Download Bulletin SZW for more information or download the instruction manual.
Inrush Current Reduction Module (ICRM)
The ICRM minimizes inrush currents on voltage regulators that incorporate Pulse Width Modulated (PWM) technology when they are powered from station service sources that are already at nominal levels.
Two versions of the ICRM are now available that are compatible with Basler Electric’s AVC63-12, AVC125-10, DECS-100 and DECS-200.
Download an Application Note on the ICRM or download the instruction manual.
Paralleling Modules
Basler Electric offers the APM300 that provides excellent reactive droop or reactive differential compensation. See the Voltage Regulator Accessories Selector Chart for the paralleling module offered for the different Basler Electric voltage regulators.
Download Bulletin SPI on the APM300

Excitation Support Systems
Two basic types of excitation support are offered. One is the Series Boost Option that maintains a constant power input for the voltage regulator and the other is the Current Boost System that supplies needed excitation directly into the field of the generator along with the regulator output. Both types give excellent generator excitation support for short circuit conditions and motor starting. See the Voltage Regulator Accessories Selector Chart for the Excitation Support Systems offered for the different Basler Electric voltage regulators.
Download Bulletin SP for information on the Series Boost Option. To learn about the Current Boost System, download Bulletin SQA or Bulletin SRR or Bulletin SPW. Product manuals are also available.
Manual Voltage Controls
A wide range of manual voltage controls is offered as a redundant back-up to the automatic voltage regulator. The manual voltage controller allows for operator control of the generator's voltage when the automatic voltage regulator is removed from the voltage control loop.
Basler Electric offers three families of manual voltage controllers to fit your generator control requirements. These families are the MVC100, MVC200 and MVC300. See the Voltage Regulator Accessories Selector Chart for the Manual Voltage Controller offered for the different Basler Electric voltage regulators.
Download Bulletin SPC for information on the MVC modules; download Bulletin SRU for more information on the MVC100 and 200 series; Bulletin SRK for more information on the MVC300 series. Product manuals are also available.
Power Isolation Transformers
Standard models are offered from 208 volts up to 15 KV for voltage matching to the power requirements of the regulator. Medium and high voltage units rated with a primary voltage above 600 VAC have primary line fuse protection and low corona characteristics. Both 50/60 and 400 Hz units are available. Consult the application chart in this catalog for specifics. For special applications, contact Basler Electric for custom designed products.
Download Bulletin SP or more information.
VAR/Power Factor Control
For cogeneration and other utility parallel applications, Basler Electric offers an SCP250 VAR/Power Factor Controller. This unit receives generator voltage and current inputs to monitor the reactive condition of the generator set. Control signals are sent from the SCP250 to the voltage regulator to maintain the generator's VAR or Power Factor within a regulation band prescribed by the customer. All solid state construction makes the unit easily calibrated on site and maintains levels within +/-5%.
Download Bulletin UKR for more information or download the product manual.

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