GE IS200ISBAH1ABB Gas turbine system circuit card

Description

GE General Electric Technical Specifications: IS200ISBAH1ABB

All measured IS200ISBAH1ABB current values are displayed here. A, B, C AMPS represent the output side CT measurements: A, B, C NEUT.

AMPS the neutral end CT measurements, and A, B, C DIFF. AMPS the differential operating current calculated as the vector

difference between the output side and the neutral end CT measurements on a per phase basis. The IS200ISBAH1ABB negative

sequence current is defined as the ratio of negative-sequence current to generator rated FLA, I2 / FLA × 100%. The gener

ator full load amps is calculated as: generator rated MVA / ( × generator phase-phase voltage). Polar coordinates for

measured currents are also shown using Va (wye connection) or Vab (open delta connection) as a zero angle reference

vector. In the absence of a voltage signal (Va or Vab), the IA output current is used as the zero angle reference vector.

Measured voltage parameters will be displayed here. The V/Hz measurement is a per unit value based on Vab voltage/

measured frequency divided by VT IS200ISBAH1ABB nominal/nominal system frequency. Polar coordinates for measured phase and/or line

voltages are also shown using Va (wye connection) or Vab (open delta connection) as a zero angle reference vector. In the

absence of a voltage signal (Va or Vab), IA output current is used as the zero angle reference vector.

If VT CONNECTION TYPE is programmed as “None” and NEUTRAL VOLTAGE TRANSFORMER is “No” in S2 SYSTEM, the follow

ing flash message will appear when an attempt is made to enter this group of messages.

One of the IS200ISBAH1ABB general counters will count the number of breaker operations over time. This may be useful information for

breaker maintenance. The number of breaker operations is incremented whenever the breaker status changes from closed

to open and all phase currents are zero. Another counter counts the number of thermal resets if one of the assignable digi

tal inputs is assigned to thermal reset. This may be useful information when troubleshooting. When either of these counters

reaches 50000, that counter will reset to 0. Each counter can also be cleared using the S1 489 SETUP \ CLEAR DATA \ CLEAR

BREAKER INFORMATION setpoint. The number of breaker operations will not update if a digital input programmed as Test

Input is shorted.

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