GE IS200TRPAH2AHE MARK VI Board

Description

GE General Electric Technical Specifications: IS200TRPAH2AHE

When current polarized, the GROUND CURRENT CT INPUT is used to determine sensitive ground current direction.

The IS200TRPAH2AHE polarizing current comes from a source CT measuring the current flowing from the ground return into the

neutral of a ground fault current source which is usually a transformer. The direction is Forward when the sen

sitive ground current is within ±90° of the polarizing current. Otherwise, the direction is Reverse. If the polariz

ing current is less than 5% of CT nominal then the direction defaults to forward.

IS200TRPAH2AHE Dual polarization provides maximum security and reliability. If the polarizing voltage magnitude is insufficient

then the current polarizing takes control. If the polarizing current magnitude is insufficient then the voltage

polarizing takes control. If neither voltage nor current polarizing is possible then the direction defaults to for

ward.

If sensitive ground directional control with both voltage and current polarized

elements is desired, enter Dual. With this setting, both polarizing quantities

must agree that the operating current is in the reverse direction for the sensi

tive ground directional element to operate the selected output relays. If sensi

IS200TRPAH2AHE tive ground directional control with only the voltage polarized element is

desired, enter Voltage. If sensitive ground directional control with only the cur

rent polarized element is desired, enter Current.

This setting affects the voltage element only. As the system zero sequence

voltage is used as the polarizing voltage for this element, a minimum level of

voltage must be selected to prevent operation caused by system unbalanced

voltages or VT ratio errors. For well-balanced systems and 1% accuracy VTs,

this setpoint can be as low as 2% of VT nominal voltage. For systems with

high-resistance grounding or floating neutrals, this setpoint can be as high as

20%. The default value of 0.05 x VT is appropriate for most solidly grounded

systems.

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