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Home ⊙ WOODWARD ⊙ Woodward ESDR 4 Current Differential Protection Relay

Woodward ESDR 4 Current Differential Protection Relay

From:Woodward | Author:kongjiang | Time :2026-01-20 | 1267 Browse: | 🔊 Click to read aloud ❚❚ ▶ | Share:

pick-up t. Id>IN

release    0.00s

Relay enable delay time for Id>IN (monitoring level 2) 0.04 to 3.00 s

If the differential current surpasses the generator rated current without interruption

over this time period, a fault condition for exceeding the threshold limit will be ini

tiated.

pick-up t. Id

release    0.00s

Relay enable delay time for Id

If the differential current surpasses the adjusted trigger threshold without interrup

tion over this tme period, a fault condition for exceeding the threshold limit will be

initiated.

release time

release    0.00s

Relay disable delay time (monitoring level 2) 0.10 to 3.00 s

Only visible when the screen "Automatic reset of the relay" is configured to

ON .

If the differential current value which initiated the fault condition should fall 2% or

more below the trigger threshold limit and remain uninterrupted for the period of

time configured here, the fault condition will be terminated and the relay output

and the fault text will be reset.

automatic reset

error text   ON

Automatic reset of error text ON/OFF

Only visible when the screen "Automatic reset of the relay" is configured to

ON

ON................The displayed fault text will be automatically deleted, when the fault

conditions are no longer detected.

OFF..............The displayed fault text must be deleted manually, and can only be

done when fault conditions are no longer detected.

automatic reset

error text   00s

Delay for automatic reset of error text 1 to 60 s

Only visible when the screens "Automatic reset of the relay" and "Automatic

reset of error text" are configured to ON

The fault text will automatically delete, when the fault conditions are no longer de

tected for the time period set here.

warning

ON

Warning (monitoring level 1) ON/OFF

ON................The adjustable warning characteristic is being monitored and the fol

lowing screens of this option are displayed.

OFF..............The adjustable warning characteristic is not being monitored and the

following screens of this option are not displayed.

warning limit

Id/IN    Y=00.0%

Trigger value Id/IN (monitoring level1. Y1) 3.0 to 40.0 %

Only visible when the screen "Warning" is configured to ON.

This value determines the vertical position of the corner point of the warning char

acteristic. The horizontal position (X12) is identical with that of the trip character

istic. Usually the warning limit is lower than the trip limit value.

pick-up time

warning    0.00s

Enable delay time of the "warning" relay (monitoring level1) 0.04 to 3.00 s

Only visible when the screen "Warning" is configured to ON.

If the differential current exceeds the warning threshold curve without interruption

over this time period, the control recognizes that the warning limit has been ex

ceeded.

release time

warning    0.00s

Relay disable delay time (monitoring level 1) 0.10 to 3.00 s

Only visible when the screen "Warning" is configured to ON

If the differential current value which initiated the warning should fall 2% or more

below the trigger threshold limit and remain uninterrupted for the period of time

configured here, the fault condition will be terminated and the relay output and

fault text will be reset.

display value

Id           [-]

Display – measured value Id in [%] / [A]

[%]...............The percentage of the rated generator current that is measured is dis

played on the screen.

[A]:...............The measured absolute values are displayed on the screen.

display value

IS           [-]

Display – measured value IS in [%] / [A]

[%]...............The percentage of the rated generator current that is measured is dis

played on the screen.

[A]:...............The absolute measured values are displayed on the screen.



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