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5-12 489 Generator Management Relay

GE Power Management

5.3 A2 METERING DATA 5 ACTUAL VALUES

5.3 A2 METERING DATA 5.3.1 CURRENT METERING

All measured 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 489 negative-

sequence current is defined as the ratio of negative-sequence current to generator rated FLA,

/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.

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CURRENT METERING

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A: 0 B: 0

C: 0 Amps

Range: 0 to 999999 A

a: 0 b: 0

c: 0 Neut. Amps

Range: 0 to 999999 A

a: 0 b: 0

c: 0 Diff. Amps

Range: 0 to 999999 A

AVERAGE PHASE

CURRENT: 0 Amps

Range: 0 to 999999 A

GENERATOR LOAD:

0% FLA

Range: 0 to 2000% FLA

NEGATIVE SEQUENCE

CURRENT: 0% FLA

Range: 0 to 2000% FLA

PHASE A CURRENT:

0 A 0° Lag