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6–14 845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL

HARMONIC DETECTION CHAPTER 6: METERING

Harmonic Detection

The second, third, fourth, and fifth harmonics per phase are shown here. The harmonics

values are presented in percent relative to the fundamental magnitude.

Note that similar harmonic ratios and THD values are also displayed under the general

metering menus, “Harmonics 1 - J1 Current”, “Harmonics 3 - K1 Current”, or “Harmonics 4 –

K2 Current”, where all values are calculated every three cycles. The THD values used in the

Harmonic Detection element are the same for the general metering, so they are not shown

here again. The harmonic ratios in the Harmonic Detection element are calculated and

updated every protection pass.

Path: Metering > Harmonic Detection

Synchrocheck

Path: Metering > Synchrocheck

If a Synchrocheck function setting is "Disabled," the corresponding metering display is not

displayed.

Bus Voltage Magnitude (Bus Volts Magnitude)

Range: 0.00 to 600000.00 V

Bus Voltage Angle (Bus Volts Angle)

Range: 0.0 to 359.9°

Bus Voltage Frequency (Bus Volts Frequency)

Range: 2.000 to 90.000 Hz

Line Voltage Magnitude (Line Volts Magnitude)

Range: 0.00 to 600000.00 V

Line Voltage Angle (Line Volts Angle)

Range: 0.0 to 359.9°

Line Voltage Frequency (Line Volts Frequency)

Range: 2.000 to 90.000 Hz

Voltage Difference (Volts Difference)

Range: 0.00 to 600000.00 V

Voltage Angle Difference (Angle Difference)

Range: 0.0 to 359.9°

Voltage Frequency Difference (Frequency Difference)

Range: 2.000 to 90.000 Hz

GE 845 User Manual

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