GE IS200TRPGH1BDD Mark VI IS200 Speedtronic Series

Description

GE General Electric Technical Specifications: IS200TRPGH1BDD

The 750/760 incorporates a Neutral Displacement element, which uses the internally derived 3Vo value. This

IS200TRPGH1BDD protection element requires the three phase Bus VTs to be wye connected. When setting the pickup level for

this element, it is important to consider the error in the VT ratio as well as the normal voltage unbalance on the

system. The Neutral Displacement setpoints are as follows.

The IS200TRPGH1BDD user should be aware that the neutral displacement feature should be applied with caution. It would nor

mally be applied to give line to ground fault coverage on high impedance grounded or ungrounded systems,

which are isolated. This constraint stems from the fact that a measurement of 3V0 cannot discriminate between

a faulted circuit and an adjacent healthy circuit. Use of a time delayed back-up or an alarm mode allow other

protections an opportunity to isolate the faulted element firs

The 750/760 can be used as the primary detecting relay in automatic load shedding schemes based on under

IS200TRPGH1BDD frequency. The need for such a relay arises if during a system disturbance, an area becomes electrically iso

lated from the main system and suffers a generation deficiency due to the loss of either transmission or

generation facilities. If reserve generation is not available in the area, conditions of low system frequency will

occur which may lead to a complete collapse. The 750/760 provides two underfrequency and one rate-of

change of frequency protection elements which can automatically disconnect sufficient load to restore an

acceptable balance between load and generation.

Enter the minimum value of current required on any phase to allow the under

frequency element to operate. Used to prevent underfrequency tripping during

periods of light load, when this action would have an insignificant effect on the

system.

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