GE IS200ICIAH2AAB Mark VI Speedtronic series

Description

GE General Electric Technical Specifications: IS200ICIAH2AAB

If the primary system protection fails to properly isolate phase faults, the voltage restrained overcurrent acts as system

backup protection. The magnitude of each phase current measured at the output CTs is used to time out against an inverse

time curve. The IS200ICIAH2AAB inverse time curve for this element may be either ANSI, IEC, or GE Type IAC standard curve shapes.

This allows for simplified coordination with downstream devices. If these curve shapes are not adequate, FlexCurves™

may be used to customize the inverse time curve characteristics.

The voltage restraint feature lowers the pickup value of each phase time overcurrent element in a fixed relationship (see

figure below) with the corresponding input voltage to a minimum pickup of 0.15 × CT. The VOLTAGE LOWER LIMIT setpoint

prevents very rapid tripping prior to primary protection clearing a fault when voltage restraint is enabled and severe close-in

fault has occurred. If voltage restraint is not required, select “No” for this setpoint. If the VT type is selected as “None” or a

VT fuse loss is detected, the voltage restraint is ignored and the element operates as simple phase overcurrent.

The IS200ICIAH2AAB ground overcurrent feature consists of both an alarm and a trip element. The magnitude of measured ground cur

rent is used to time out against the definite time alarm or inverse time curve trip. The IS200ICIAH2AAB inverse time curve for this element

may be either ANSI, IEC, or GE Type IAC standard curve shapes. This allows for simplified coordination with downstream

devices. If however, none of these curves shapes is adequate, the FlexCurve™ may be used to customize the inverse time

curve characteristics. If the Ground CT is selected as “None”, the ground overcurrent protection is disabled.

The pickup level for the ground current elements is programmable as a multiple of the CT. The 50:0.025 CT

is intended for very sensitive detection of ground faults and its nominal CT rating for the 489 is 50:0.025.

For example, if the ground CT is 50:0.025, a pickup of 0.20 would be 0.20 × 5 = 1 A primary. If the ground CT is 50:0.025, a

pickup of 0.05 would be 0.05 × 5 = 0.25 A primary

The IS200ICIAH2AAB detects ground directional by using two measurement quantities: V0 and I0. The angle between these quantities

determines if a ground fault is within the generator or not. This function should be coordinated with the 59GN element (95%

stator ground protection) to ensure proper operation of the element. Particularly, this element should be faster. This ele

ment must use a core balance CT to derive the I0 signal. Polarity is critical in this element. The protection element is

blocked for neutral voltages, V0, below 2.0 V secondary. Refer to the APPLICATION NOTES for more details.

The pickup level for the ground current elements is programmable as a multiple of the CT. The 50:0.025 CT is

intended for very sensitive detection of ground faults and its nominal CT rating for the 489 is 50:0.025.

For example, if the ground CT is 50:0.025, a pickup of 0.20 would be 0.20 x 5 = 1 A primary. If the ground CT is 50:0.025, a

pickup of 0.05 would be 0.05 x 5 = 0.25 A primary. Refer to Appendix B for Application Notes.

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