GE IS200VPROH1A IS200VPROH1AC Circuit board

Description

GE General Electric Technical Specifications: IS200VPROH1A

If the transfer scheme is not required select Disabled for this setpoint. If not

IS200VPROH1A disabled, this setpoint is used to assign to the relay the function of the associ

ated circuit breaker. This selection programs the relay to use the logic required

by each of the three breakers. Select Incomer 1 or Incomer 2 for this setpoint if

the relay is associated with the breaker to be used as Incomer 1 or 2 respec

IS200VPROH1A tively. Select Bus Tie if the relay is associated with the bus tie breaker.

This delay time establishes an interval from the reset of an operated instanta

neous overcurrent element on this source, during which the line instantaneous

undervoltage element (27-3) is allowed to block a transfer. Select the desired

delay

These output relays are used to implement the transfer scheme, and must therefore not be operated by any

IS200VPROH1A other feature of the relay. These relays must be programmed to have a non-operated state of ‘De-energized’

with the output type as ‘Self-reset’. These are the default settings.

Instantaneous Phase-1 or 2 (50P1 or 2) and Instantaneous Neutral-1 or 2 (50N-1 or 2)

(Incomers 1 and 2 only)

These fault detectors can be used as an input to transfer scheme logic in this application, and therefore the

function setpoint of elements that are used must be set to Control. These elements block a transfer while a

IS200VPROH1A fault, which can cause a severe voltage dip, is present on the load side of the breaker. This fault should be

cleared by time overcurrent protection on the incomer or an upstream breaker. If 50P is set properly, during this

event it will allow the 27-4 element to time out before the inverse time phase overcurrent operates, but still pre

vent transfer initiation. The 50P element should be set above the maximum current caused by either the bus

motor contribution to an upstream fault, or the maximum current during low voltage conditions. The 50N ele

ment should be set to detect arcing ground faults, but allow permitted unbalances.

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