FPNO-21 bus communication adapter module special for ABB frequency converter

Description

Energization inhibit settings are put in service upon detection of de-energization. Upon

energization, the energization inhibit duration timer is initiated and the settings are

removed from service when the time delay elapses. The energization inhibit feature may

also be put in service during sympathetic inrush. The onset of sympathetic inrush is

detected via a close command to the parallel transformer switching device connected to a

logic input, assigned to the PARALL XFMR BRKR CLS setpoint. Energization inhibit settings

are put in service when the contact closes. Upon signal removal, the energization inhibit

duration timer is initiated and the settings are removed from service when the time delay

elapses.

In a breaker-and-a-half scheme, where current can be present in the CTs without being

present in the transformer winding, it may be necessary to use the parallel transformer

breaker close contact to initiate energization inhibit.

ENERGIZATION INHIBIT PARAMETERS: Select “2nd” to compare the 2nd harmonic

current against HARMONIC INHIBIT LEVEL. Select “2nd + 5th” to use the RMS sum of

the 2nd and 5th harmonics.

HARMONIC AVERAGING: Select “Enabled” to use the three-phase average of the

harmonic current against the harmonic inhibit setting.

ENERGIZATION INHIBIT LEVEL: Enter the level of harmonic current (2nd or 2nd + 5th)

above which the percent differential element is inhibited from operating. This setting

will often need to be set significantly lower than the HARMONIC INHIBIT LEVEL,

especially when used with the “Parallel Xfmr BkrCls” logic input function for

sympathetic inrush.

ENERGIZATION INHIBIT DURATION: Enter the time delay from the moment of

energization (or the end of the parallel breaker close command) before the

energization inhibit feature is removed from service.

ENERGIZATION SENSING BY CURRENT: Select “Enabled” to detect de-energization by

the level of all currents dropping below the minimum energization current.

MINIMUM ENERGIZATION CURRENT: Enter the current level below which the

transformer is considered de-energized (energization sensing by current enabled), and

above which the transformer is considered energized (any energization sensing

enabled).

ENERGIZATION SENSING BY VOLTAGE: Select “Enabled” to detect de-energization by

the level of the voltage dropping below the minimum energization voltage. This

setpoint is displayed only if S2 SYSTEM SETUP  VOLTAGE INPUT  VOLTAGE SENSING

is “Enabled”.

MINIMUM ENERGIZATION VOLTAGE: Enter the voltage level below which the

transformer is considered de-energized (when ENERGIZATION SENSING BY VOLTAGE is

“Enabled”). This setpoint is displayed only if S2 SYSTEM SETUP  VOLTAGE INPUT 

VOLTAGE SENSING is “Enabled”.

BREAKERS ARE OPEN SIGNAL: Select any logic input which, when asserted, indicates

to the 745 that the transformer is de-energized. The selected logic input should be

connected to the auxiliary contacts of the transformer breaker or disconnect switch.

PARALL XFMR BRKR CLS SIGNAL: Select any logic input which, when asserted, will

indicate to the 745 the onset of sympathetic inrush. The selected logic input should be

connected to the close command going to the parallel transformer switching device.

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