IS200IGEHG1ACA GENERAL ELECTRIC BOARD

Description

GE General Electric Technical Specifications: IS200IGEHG1ACA

The IS200IGEHG1ACA figure below illustrates typical thermal limit curves for induction motors. The starting characteristic is shown for a high

inertia load at 80% voltage. If the machine started quicker, the distinct characteristics of the thermal limit curves would not

be required and the running overload curve would be joined with locked rotor safe stall times to produce a single overload

curve.

The generator manufacturer should provide a safe stall time or thermal limit curves for any generator that is started as an

induction motor. These thermal limits are IS200IGEHG1ACA intended to be used as guidelines and their definition is not always precise. When

operation of the generator exceeds the thermal limit, the generator insulation does not immediately melt, rather, the rate of

insulation degradation reaches a point where continued operation will significantly reduce generator life.

The IS200IGEHG1ACA integrates both stator and rotor heating into one model. Machine heating is reflected in a register called Thermal

Capacity Used. If the machine has been stopped for a long period of time, it will be at ambient temperature and thermal

capacity used should be zero. If the machine is in overload, once the thermal capacity used reaches 100%, a trip will occur.

The overload curve accounts for machine heating during stall, acceleration, and running in both the stator and the rotor.

The Overload Pickup setpoint defines where the running overload curve begins as the generator enters an overload condi

tion. This is useful to accommodate a service factor. The IS200IGEHG1ACA curve is effectively cut off at current values below this pickup.

Generator thermal limits consist of three distinct parts based on the three conditions of operation, locked rotor or stall,

acceleration, and running overload. Each of these curves may be provided for both a hot and cold machine. A hot machine

is defined as one that has been running for a period of time at full load such that the stator and rotor temperatures have set

tled at their rated temperature. A cold machine is defined as a machine that has been stopped for a period of time such that

the stator and rotor temperatures have settled at ambient temperature. For most machines, the distinct characteristics of

the thermal limits are formed into one smooth homogeneous curve. Sometimes only a safe stall time is provided. This is

acceptable if the machine has been designed conservatively and can easily perform its required duty without infringing on

the thermal limit. In this case, the protection can be conservative. If the machine has been designed very close to its ther

mal limits when operated as required, then the distinct characteristics of the thermal limits become important.

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