GE IS200ISRJG1A Gas turbine card

Description

GE General Electric Technical Specifications: IS200ISRJG1A

Though IS200ISRJG1A in theory one could use this element with a zero sequence current signal obtained from a summation of the three

phase currents (neutral end or output end), by connecting it in the star point of the phase CTs, options 4 and 5 in the figure

below, this approach is not very useful. The main drawback, for impedance-grounded generators is that the zero-sequence

current produced by the CT ratio and phase errors could be IS200ISRJG1A much larger than the zero sequence current produced by a real

ground fault inside the generator.

Again the time delay on this element must be coordinated with protection elements downstream, if the generator is

grounded. Refer to the relay manual/3/ for the range of settings of the pickup levels and the time delays. The time delay on

this element should always be longer than the longest delay on line protection downstream.

If correct polarities are observed in the connection of all signals to the relay, the Vneutral signal will be in phase with the

ground current signal. The element has been provided with a setting allowing the IS200ISRJG1A user to change the plane of operation to

cater to reactive grounding impedances or to polarity inversions.

This element’s normal “plane of operation” for a resistor-grounded generator is the 180° plane, as shown in Figure B–5:

GROUND DIRECTIONAL ELEMENT POLARITIES AND PLANE OF OPERATION, for an internal ground fault. That is, for

an internal stator-to-ground fault, the Vo signal is 180° away from the Io signal, if the polarity convention is observed. If the

grounding impedance is inductive, the plane of operation will be the 270° plane, again, with the polarity convention shown

below. If the polarity convention is reversed on one input, the IS200ISRJG1A user will need to change the plane of operation by 180°.

The operating principle of this element is quite simple: for internal ground faults the two signals will be 180° out of phase

and for external ground faults, the two signals will be in phase. This simple principle allows the element to be set with a high

sensitivity, not normally possible with an overcurrent element.

The current pickup level of the element can be adjusted down to 0.05 × CT primary, allowing an operate level of 0.25 A pri

mary if the 50:0.025 ground CT is used for the core balance. The minimum level of Vneutral at which the element will operate

is determined by hardware limitations and is internally set at 2.0 V.

Because this element is directional, it does not need to be coordinated with downstream protections and a short operating

time can be used. Definite time delays are suitable for this element.

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