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AVR and PMG for short-circuit maintenance

(AVR) AUTOMATIC VOLTAGE REGULATORS: AVR AND PMG FOR SHORT-CIRCUIT MAINTENANCE

Permanent Magnet Generator Type Automatic Voltage Regulators ('M' Prefix)
For the ultimate in control, an AVR designed to operate with the Stamford Permanent Magnet Generator (PMG) system is often specified. In this design the AVR receives its power from a separately generated source, in the form of a small generator mounted on the end of the main generator shaft.

The advantage of this is that the AVR power source is not affected by sudden loads applied to the generator, hence the excitation field remains at full strength, sustaining a high level of short circuit current at the generator output terminals.

MX341

The MX341 achieves voltage regulation in the order of plus and minus 1.0 %, through the use of the PMG system. Protection against sustained over-excitation is standard on this AVR, as is a special engine relief load acceptance feature which enables full load to be applied in a single step.

MX321

The MX321 has all the features of the MX341, additionally achieving voltage regulation in the order of 0.5 %. There is also the facility for 3-phase RMS sensing, built in overvoltage protection and optional short circuit current level adjustment.

The combination of PMG providing an isolated power source and the MX321's RMS sensing makes an ideal arrangement for supplying the non-linear loads associated with UPS systems.

MA325

The MA325 has all the features of the MX321, but is designed specifically to handle the higher power requirements of the P70.

 

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