GE IS200ISRJG1AAA Gas turbine card

Description

GE General Electric Technical Specifications: IS200ISRJG1AAA

Applications with generators operated in parallel and IS200ISRJG1AAA grounded through a common impedance require special consider

ations. If only one generator is grounded and the other ones left floating, the directional element for the floating generators

does not receive a correct Vneutral signal and therefore cannot operate correctly. In those applications, the element makes

use of auxiliary contacts off the grounding switch IS200ISRJG1AAA and the unit breaker to turn the element into a simple overcurrent element,

with the pickup level set for the directional element (note that the ground directional element and the ground overcurrent

elements are totally separate elements). In this mode, the element can retain a high sensitivity and fast operate time since

it will only respond to internal stator ground faults. The table below illustrates the status of different elements under various

operating conditions.

The conventional IS200ISRJG1AAA neutral overvoltage element or the ground overcurrent element are not capable of reliably detecting stator

ground faults in the bottom 5% of the stator, due to lack of sensitivity. In order to provide reliable coverage for the bottom

part of the stator, protective elements, utilizing the third harmonic voltage signals in the neutral and at the generator output

terminals, have been developed [4].

In the 489 relay, the third-harmonic voltage element, Neutral Undervoltage (3rd Harmonic) derives the IS200ISRJG1AAA third harmonic com

ponent of the neutral-point voltage signal from the

Vneutral signal as one signal, called VN3. The third harmonic component

of the internally summed phase-voltage signals is derived as the second signal, called VP3. For this element to perform as

originally intended, it is necessary to use wye-connected VTs

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