BECKWITH ELECTRIC M-3425A, Инструкция, Страница: 12 / 482

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M‑3425A Generator Protection Relay
PROTECTIVE FUNCTIONS ( cont .)
Device Setpoint
Number Function Ranges Increment Accuracy
†
IPSlogic
TM
IPSlogic uses element pickups, element trip commands, control/status input state changes,
output contact close signals to develop 6 programmable logic schemes.
Time Delay #1–#6 1 to 8160 Cycles 1 Cycle

1 Cycle or

1%
Breaker Monitoring
Pickup 0 to 50,000 kA Cycles 1 kA Cycles

1 kACycles
or kA
2
Cycles or kA
2
Cycles or kA
2
Cycles
Time Delay 0.1 to 4095.9 Cycles 0.1 Cycles

1 Cycle or

1%
Timing Method
I
T or
I
2 T
Preset Accumulators 0 to 50,000 kA Cycles 1 kA Cycle
Phase A, B, C
The Breaker Monitor feature calculates an estimate of the per‑phase wear on the breaker contacts by measuring
and integrating the current (or current squared) through the breaker contacts as an arc.
The per‑phase values are added to an accumulated total for each phase, and then compared to a user‑pro‑
grammed threshold value. When the threshold is exceeded in any phase, the relay can set a programmable output
contact.
The accumulated value for each phase can be displayed.
The Breaker Monitoring feature requires an initiating contact to begin accumulation, and the accumulation begins
after the set time delay.
Trip Circuit Monitoring
Time Delay 1 to 8160 Cycles 1 Cycle

1 Cycle or

1%
The AUX input is provided for monitoring the integrity of the trip circuit. This input can be used for nominal trip coil
voltages of 24 V dc, 48 V dc, 125 V dc and 250 V dc.
Nominal Settings
Nominal Voltage 50.0 to 140.0 V 0.1 V
—
Nominal Current 0.50 to 6.00 A 0.01 A —
VT Configuration Line‑Line/Line‑Ground/
Line‑Ground to Line‑Line*
Delta/Wye Unit
Transformer Disable/Delta AB/Delta AC
Seal‑In Delay 2 to 8160 Cycles 1 Cycle

1 Cycle or

1%
*When Line‑Ground to Line‑Line is selected, the relay internally calculates the line‑line voltages from the line‑
ground voltages for all voltage‑sensitive functions. This Line‑Ground to Line‑Line selection should only be used for
a VT connected Line‑Ground with a secondary voltage of 69 V (not 120 V).
†
Select the greater of these accuracy values. Values in parentheses apply to 1 A CT secondary rating.
IPS
BM
TC