GE IS200IGPAG1A Gate DRV power board

Description

GE General Electric Technical Specifications: IS200IGPAG1A

The IS200IGPAG1A overload protection curve should always be set slightly lower than the thermal limits provided by the manufacturer. This

will ensure that the machine is tripped before the thermal limit is reached. If the starting times are well within the safe stall

times, it is recommended that the 489 Standard Overload Curve be used. The IS200IGPAG1A standard overload curves are a series of 15

curves with a common curve shape based on typical generator thermal limit curves (see the following figure and table).

When the generator trips offline due to overload the generator will be locked out (the trip relay will stay latched) until gener

ator thermal capacity reaches below 15%.

If the induction generator starting current begins to infringe on the thermal damage curves, it may become necessary to use

a custom curve to tailor generator protection so successful starting may be possible without compromising protection. Fur

thermore, the characteristics of the starting thermal (locked rotor and acceleration) and the running thermal damage curves

may not fit together very smoothly. In this instance, it may be necessary to use a custom curve to tailor protection to the

thermal limits to allow the generator to be started successfully and utilized to its full potential without compromising protec

tion. The distinct parts of the thermal limit curves now become more critical. For these conditions, it is recommended that

the IS200IGPAG1A custom curve thermal model be used. The custom overload curve allows users to program their own curves by

entering trip times for 30 pre-determined current levels.

The curves below show that if the running overload thermal limit curve were smoothed into one curve with the locked rotor

thermal limit curve, the induction generator could not be started at 80% voltage. A custom curve is required.

It is possible and acceptable that the acceleration time exceeds the safe stall time (bearing in mind that a locked rotor con

dition is quite different than an acceleration condition). In this instance, each distinct portion of the thermal limit curve must

be known and protection coordinated against that curve. The IS200IGPAG1A protection relay must be able to distinguish between a locked

rotor condition, an accelerating condition, and a running condition. The 489 voltage dependent overload curve feature is tai

lored to protect these types of machines. Voltage is monitored constantly during starting and the acceleration thermal limit

curve adjusted accordingly. If the VT Connection setpoint is set to none or if a VT fuse failure is detected, the acceleration

thermal limit curve for the minimum allowable voltage will be used.

The voltage dependent overload curve is comprised of the IS200IGPAG1A three characteristic thermal limit curve shapes determined by

the stall or locked rotor condition, acceleration, and running overload. The curve is constructed by entering a custom curve

shape for the running overload protection curve. Next, a point must be entered for the acceleration protection curve at the

point of intersection with the custom curve, based on the minimum allowable starting voltage as defined by the minimum

allowable voltage. Locked Rotor Current and safe stall time must also be entered for that voltage. A second point of inter

section must be entered for 100% voltage. Once again, the locked rotor current and the safe stall time must be entered, this

time for 100% voltage. The protection curve that is created from the safe stall time and intersection point will be dynamic

based on the measured voltage between the minimum allowable voltage and the 100% voltage. This method of protection

inherently accounts for the change in speed as an impedance relay would. The change in impedance is reflected by

machine terminal voltage and line current. For any given speed at any given voltage, there is only one value of line current.

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