GE IS200ISBEH2ABC PRINTED CIRCUIT PCB BOARD

Description

GE General Electric Technical Specifications: IS200ISBEH2ABC

The IS200ISBEH2ABC Generator Management Relay offers a number of elements to protect a generator against stator ground faults.

Inputs are provided for a neutral-point voltage signal and for a zero-sequence current signal. The zero-sequence current

input can be into a nominal 1 A secondary circuit or an input reserved for a special GE Power Management type HGF

ground CT for very sensitive ground current detection. Using the HGF CT allows measurement of ground current values as

low as 0.25 A primary. With impedance-grounded generators, a single ground fault on the stator does not require that the

unit be quickly removed from service. The grounding impedance limits the fault current to a few amperes. A second ground

fault can, however, result in significant damage to the unit. Thus the importance of detecting all ground faults, even those in

the bottom 5% of the stator. The IS200ISBEH2ABC fault detection methods depend on the grounding arrangement, the availability of core bal

ance CT, and the size of the unit. With modern full-featured digital generator protection relays such as the 489, users do not

incur additional costs for extra protection elements as they are all part of the same device. This application note provides

general descriptions of each of the elements in the 489 suitable for stator ground protection, and discusses some special

applications

The simplest, and one of the IS200ISBEH2ABC oldest methods to detect stator ground faults on high-impedance-grounded generators, is to

sense the voltage across the stator grounding resistor [1, 2]. This is illustrated, in a simplified form in the figure below. The

voltage signal is connected to the Vneutral input of the 489, terminals E10 and F10. The Vneutral signal is the input signal for

the 489 neutral overvoltage protection element. This element has an alarm and a trip function, with separately adjustable

operate levels and time delays. The trip function offers a choice of timing curves as well as a definite time delay. The neutral

overvoltage function responds to fundamental frequency voltage at the generator neutral. It provides ground fault protection

for approximately 95% of the stator winding. The limiting factor is the level of voltage signal available for a fault in the bot

tom 5% of the stator winding. The element has a range of IS200ISBEH2ABC adjustment, for the operate levels, of 2 to 100 V.

The operating time of this element should be coordinated with protective elements downstream, such as feeder ground

fault elements, since the neutral overvoltage element will respond to external ground faults if the generator is directly con

nected to a power grid, without the use of a delta-wye transformer.

In addition, the time delay should be coordinated with the ground directional element (discussed later), if it is enabled, by

using a longer delay on the neutral overvoltage element than on the directional element.

It is recommended that an isolation transformer be used between the relay and the grounding impedance to reduce com

mon mode voltage problems, particularly on installations requiring long leads between the relay and the grounding imped

ance.

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