GE IS200IGPAG2A Gate DRV power board

Description

GE General Electric Technical Specifications: IS200IGPAG2A

To illustrate the IS200IGPAG2A Voltage Dependent Overload Curve feature, the thermal limits shown in Figure 4–13: THERMAL LIMITS

FOR HIGH INERTIAL LOAD on page 4–57 will be used.

1. Construct a custom curve for the running overload thermal limit. If the curve does not extend to the acceleration ther

mal limits, extend it such that the curve intersects the acceleration IS200IGPAG2A thermal limit curves. (see CUSTOM CURVE below).

2. Enter the per unit current value for the acceleration overload curve intersect with the custom curve for 80% voltage.

Also enter the per unit current and safe stall protection time for 80% voltage (see ACCELERATION CURVE below).

3. Enter the per unit current value for the acceleration overload curve intersect with the custom curve for 100% voltage.

Also enter the per unit current and safe stall protection time for 100% voltage (see ACCELERATION CURVE below

The IS200IGPAG2A takes the information provided and create protection curves for any voltage between the minimum and 100%. For

values above the voltage in question, the IS200IGPAG2A extrapolates the safe stall protection curve to 110% voltage. This current

level is calculated by taking the locked rotor current at 100% voltage and multiplying by 1.10. For trip times above the 110%

current level, the trip time of 110% will be used (see the figure below)

Unbalanced phase currents will cause additional rotor heating that will not be accounted for by electromechanical relays

and may not be accounted for in some electronic protective relays. When the generator is running, the rotor will rotate in the

direction of the positive sequence current at near synchronous speed. Negative sequence current, which has a phase rota

tion that is opposite to the positive sequence current, and hence, opposite to the rotor rotation, will generate a rotor voltage

that will produce a substantial rotor current. This induced current will have a frequency that is approximately twice the line

frequency, 100 Hz for a 50 Hz system or 120 Hz for a 60 Hz system. Skin effect in the rotor bars at this frequency will cause

a significant increase in rotor resistance and therefore, a significant increase in rotor heating. This extra heating is not

accounted for in the thermal limit curves supplied by the generator manufacturer as these curves assume positive

sequence currents only that come from a perfectly balanced supply and generator design.

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