GE IS200IGEHG1A IGBT INTERFACE PASSI BOARD

Description

GE General Electric Technical Specifications: IS200IGEHG1A

The IS200IGEHG1A has an Open RTD Sensor Alarm. This alarm will look at all RTDs that have either an alarm or trip programmed and

determine if an RTD connection has been broken. Any RTDs that do not have a trip or alarm associated with them will be

ignored for this feature. When a broken sensor is detected, the assigned output relay will operate and a message will

appear on the display identifying the RTD that is broken. It is recommended that if this feature is used, the alarm be pro

grammed as latched so that intermittent RTDs are detected and corrective action may be taken.

The IS200IGEHG1A has an RTD Short/Low Temperature alarm. This alarm will look at all RTDs that have either an alarm or trip pro

grammed and determine if an RTD has either a short or a very low temperature (less than –50°C). Any RTDs that do not

have a trip or alarm associated with them will be ignored for this feature. When a short/low temperature is detected, the

assigned output relay will operate and a message will appear on the display identifying the RTD that caused the alarm. It is

recommended that if this feature is used, the alarm be programmed as latched so that intermittent RTDs are detected and

corrective action may be taken.

The thermal model of the IS200IGEHG1A is primarily intended for induction generators, especially those that start on the system bus in

the same manner as induction motors. However, some of the thermal model features may be used to model the heating

that occurs in synchronous generators during overload conditions.

One of the principle enemies of generator life is heat. Generator thermal limits are dictated by the design of both the stator

and the rotor. Induction generators that start on the system bus have three modes of operation: locked rotor or stall (when

the rotor is not turning), acceleration (when the rotor is coming up to speed), and generating (when the rotor turns at super

synchronous speed). Heating occurs in the generator during each of these conditions in very distinct ways. Typically, during

the generator starting, locked rotor and acceleration conditions, the generator will be rotor limited. That is to say that the

rotor will approach its thermal limit before the stator. Under locked rotor conditions, voltage is induced in the rotor at line fre

quency, 50 or 60 Hz. This voltage causes a current to flow in the rotor, also at line frequency, and the heat generated (I 2R)

is a function of the effective rotor resistance. At 50 or 60 Hz, the reactance of the rotor cage causes the current to flow at

the outer edges of the rotor bars. The effective resistance of the rotor is IS200IGEHG1A therefore at a maximum during a locked rotor con

dition as is rotor heating. When the generator is running at above rated speed, the voltage induced in the rotor is at a low

frequency (approximately 1 Hz) and therefore, the effective resistance of the rotor is reduced quite dramatically. During

overloads, the generator thermal limit is typically dictated by stator parameters. Some special generators might be all stator

or all rotor limited. During acceleration, the dynamic nature of the generator slip dictates that rotor impedance is also

dynamic, and a third thermal limit characteristic is necessary.

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