GE F650 Instruction Manual page 211

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5.4 PROTECTION ELEMENTS

Polarization magnitudes can be, as in the case of 67N, Polarization voltage (3Vo), either calculated from the phase

voltages or measured from terminals A11-A12, or polarization current (Ip), measured from the fifth input transformer

terminals, Isg, terminals B11-B12.

The following table shows the used magnitudes in each of the Polarization possibilities:

Table 5–55: USED MAGNITUDES ACCORDING TO THE POLARIZATION SETTING

POLARIZATION SETTING

The following table shows the management of the element output signals (block and permission) depending on the

Polarization Type setting.

Table 5–56: OUTPUT SIGNALS MANAGEMENT ACCORDING TO THE POLARIZATION TYPE SETTING

POLARIZATION SETTING

The configuration of the signals required for blocking the Ground overcurrent elements from the signals provided by the

Ground directional element is made at Setpoint > Relay Configuration > Protection Elements using inverted operation

signals to block the trip.

For example, to block the ground time delayed elements:

GROUND TOC1 BLOCK = NOT (GROUND DIR1 OP)

GROUND TOC2 BLOCK = NOT (GROUND DIR2 OP)

GROUND TOC3 BLOCK = NOT (GROUND DIR3 OP)

To block the Ground Instantaneous elements:

GROUND IOC1 BLOCK = NOT (GROUND DIR1 OP)

GROUND IOC2 BLOCK = NOT (GROUND DIR2 OP)

GROUND IOC3 BLOCK = NOT (GROUND DIR3 OP)

OPERATION MAG.

GROUND DIR BLOCK SIGNAL

< Ajs. POL V THRESHOLD

< POL V THRESHOLD

< POL V THRESHOLD

F650 Digital Bay Controller

POLARIZATION MAG.

GROUND DIR OP SIGNAL

Permission V

Permission I

Permission V

Permission I

Permission V

Permission I

GEK-106310AB