Basler-electric BE1-11g Instrukcja Użytkownika Pobierz pdf (Strona 489)

100

101

9424200994 Rev N 477

Setting

Value

BESTCOMSPlus Screen

Description

Mode

Percent

Differential

Protection, Current, Phase

Differential (87)

Sets the type of operation

protection to traditional

phase current differential

Slope Mode

Maximum

Protection, Current, Phase

Differential (87)

Sets the element to operate

using maximum restraint

current

Min. Rest. Pickup

(MOT)

0.10

Protection, Current, Phase

Differential (87)

Sets the minimum amount

of operate current required

for a trip to 0.10x tap

Restraint Slope 1

(%)

Protection, Current, Phase

Differential (87)

Sets the 1

slope of the

restraint characteristic to

20%

Slope Pickup

(MOT)

3.00

Protection, Current, Phase

Differential (87)

The 2

slope is active

when the measured

maximum restraint current

is greater 3x tap

Restraint Slope 2

(%)

Protection, Current, Phase

Differential (87)

Sets the 2

slope of the

restraint characteristic to

40%

Time Delay (ms)

100

Protection, Current, Phase

Differential (87)

Sets the trip time delay to

100 ms

(Optional)

Harmonics Mode

Independent

Protection, Current, Phase

Differential (87)

Sets the harmonic restraint

for independent phase

operation

(Optional) 2

Harmonic (%)

Protection, Current, Phase,

Differential (87)

Sets the second harmonic

restraint threshold to 12%

of the fundamental

(Optional) 5

Harmonic (%)

Protection , Current, Phase

Differential (87)

Sets the fifth harmonic

restraint threshold to 35%

of the fundamental

Step 2: Use BESTCOMSPlus to configure the BESTlogicPlus programmable logic shown in Figure 307.

• Blocking is disabled.

• OUT1 closes for 87 Trip.

• OUT2 closes for 87 Pickup.

• Fault recording is enabled.

Step 3: Prepare to monitor the 87R function operation. Operation can be verified by monitoring OUT2

(see Figure 307).

Step 4: To test the Minimum Restrained Pickup setting, connect two balanced three-phase current

sources to the BE1-11g in ABC rotation: 0.5∠0°, 0.5∠–120°, 0.5∠120° amps to terminals D1

through D6 and 0.5∠180°, 0.5∠60°, 0.5∠–60° amps to terminals F1 through F6 (0.25x tap).

Step 5: Slowly increase the A-phase current in CT circuit 1 or 2 until OUT2 closes and record the

pickup. This should occur at 0.70 A ±0.05 A. Verify that there is an 87A target on the front-panel

display.

Step 6: Slowly decrease the A-phase current in CT circuit 1 or 2 until OUT2 reopens and record the

dropout. See the functional test report for acceptable ranges.

Step 7: Reset to the current levels in Step 5 and reset all targets.

BE1-11g Phase Current Differential (87) Test

1 2 ... 484 485 486 487 488 489 490 491 492 493 494 ... 671 672

Basler-electric BE1-11g Instrukcja Użytkownika Strona 489

Komentarze do niniejszej Instrukcji

Basler-electric BE1-11g Instrukcja Użytkownika Strona 489

Komentarze do niniejszej Instrukcji

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