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Electrical Protection

Current Transformers

CT’s are instrument transformers that are used to provide the required data for the relays or circuit breaker operation.CT’s are       commonly used for metering or for protective purposes.Metering CT’s are used to measure the current that is flowing through     the conductors.Protection CT are designed to measure the actual currents in power systems and  to produce proportional currents in their secondary windings.

DFD Diode Failure Detector

Protects the machine against damage caused by failure of the rotating rectifier diodes


FDM Frequency Detection Module

Adjustable upper and lower speed limits, a reliable method of disconnecting an engine starter and providing over speed protection.


ELM Excitation Loss Module

Monitors the excitation to the generator. On loss of excitation an output relay is energised, can be used to initiate alarm or protective device.



Environmental and Thermal Protection

Anti condensation heaters

Prevents condensation from forming within the machine where temperature and humidity

changes are prevalent. They reduce condensation or moisture in the air immediately around the

generator, when the generator is stationary. A separate power supply is required for the anti-condensation heaters.

RTD Resistance temperature detector.

An RTD is a solid state device, which has a linear increase in resistance directly proportional to the detected temperature.

RTDs may be used for detecting temperatures in the stator winding and the generator’s bearings.


Thermistors are positive temperature coefficient resistors - low resistance when detecting low temperatures and

high resistance (open circuit) when above the tripping temperature.



PFC Power Factor Controller

Controls and maintains a required power factor condition whilst running in parallel with a mains supply.

This unit also incorporates a voltage matching facility for use with basic automatic synchronising equipment.


RCI Remote Control Interface

Allows the remote control of AVR’s or PFC’s using industry standard control signals.


Droop CT

The droop CT provides a current signal to the Droop circuit when connected to terminals S1 – S2,is required to REDUCE CIRCULATING CURRENT and SHARE reactive load current sharing when in parallel with other Generators,and/or the Grid.

Dual AVR Automatic Voltage Regulator

Two hard wired MX321 AVRs with a manual change over switch. Reduces down-time in the event of AVR failure.