GE IS200IGPAG2AED GATE DRIVE POWER SUPPLY BOARD

Description

GE General Electric Technical Specifications: IS200IGPAG2AED

The IS200IGPAG2AED figure below shows induction machine derating as a function of voltage unbalance as recommended by NEMA

(National Electrical Manufacturers Association). Assuming a typical inrush of 6 × FLA and a negative sequence impedance

of 0.167, voltage unbalances of 1, 2, 3, 4, and 5% equal current IS200IGPAG2AED unbalances of 6, 12, 18, 24, and 30%, respectively. Based

on this assumption, the GE curve illustrates the amount of machine derating for different values of k entered for the UNBAL

ANCE BIAS K FACTOR setpoint. Note that the curve created when k = 8 is almost identical to the NEMA derating curve.

The IS200IGPAG2AED thermal replica created by the features described in the sections above operates as a complete and independent

model. However, the thermal overload curves are based solely on measured current, assuming a normal 40°C ambient and

normal machine cooling. If there is an unusually high ambient temperature, or if machine cooling is blocked, generator tem

perature will increase. If the stator has embedded RTDs, the 489 RTD bias feature should be used to correct the thermal

model.

The RTD bias feature is a two part curve, constructed using 3 points. If the maximum stator RTD temperature is below the

RTD BIAS MINIMUM setpoint (typically 40°C), no biasing occurs. If the maximum stator RTD temperature is above the RTD

BIAS MAXIMUM setpoint (typically at the stator IS200IGPAG2AED insulation rating or slightly higher), then the thermal memory is fully biased

and thermal capacity is forced to 100% used. At values in between, the present thermal capacity used created by the over

load curve and other elements of the thermal model, is compared to the RTD Bias thermal capacity used from the RTD Bias

curve. If the RTD Bias thermal capacity used value is higher, then that value is used from that point onward. The RTD BIAS

CENTER POINT should be set at the rated running temperature of the machine. The 489 automatically determines the ther

mal capacity used value for the center point using the HOT/COLD SAFE STALL RATIO setpoint.

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