BECKWITH ELECTRIC M-3425A, Инструкция

Страница: 5 / 482

–4–
M‑3425A Generator Protection Relay
PROTECTIVE FUNCTIONS
Device Setpoint
Number Function Ranges Increment Accuracy
†
Phase Distance (three‑zone mho characteristic)
Circle Diameter #1,#2,#3 0.1 to 100.0 Ω 0.1 Ω

0.1 Ω or 5%
(0.5 to 500.0 Ω
) ( 
0.5 Ω or 5%)
Offset #1,#2,#3
–
100.0 to 100.0 Ω 0.1 Ω

0.1 Ω or 5%
(
–
500.0 to 500.0 Ω
) ( 
0.5 Ω or 5%)
Impedance Angle #1,#2,#3 0° to 90° 1°

1°
Load Encroachment Blinder
#1,#2,#3
Angle 1° to 90° 1°

1°
R Reach 0.1 to 100
Ω
Time Delay #1,#2,#3 1 to 8160 Cycles 1 Cycle

1 Cycle or

1%
Out‑of‑Step Delay 1 to 8160 Cycles 1 Cycle

1 Cycle or

1%
Overcurrent Supervision 0.1 to 20 A 0.1 A

0.1 A or

2%
(0.02 to 4 A) 0.01 A

0.02 A or

2%
When out‑of‑step blocking on Zone 1 or Zone 2 is enabled, Zone 3 will not trip and it will be used to detect the out‑
of‑step condition for blocking Function 21 #1 and/or 21 #2.
Volts / Hz
Definite Time
Pickup #1, #2 100 to 200% 1%

1%
Time Delay #1, #2 30 to 8160 Cycles 1 Cycle

25 Cycles
Inverse Time
Pickup 100 to 200% 1%

1%
Characteristic Curves Inverse Time #1
–
#4 — —
Time Dial: Curve #1 1 to 100 1

1%
Time Dial: Curves #2
–
#4 0.0 to 9.0 0.1

1%
Reset Rate 1 to 999 Sec. 1 Sec.

1 Second or

1%
(from threshold of trip)
The percent pickup is based on nominal VT secondary voltage and nominal system frequency settings. The pickup
accuracy stated is only applicable from 10 to 80 Hz, 0 to 180 V, 100 to 150% V/Hz and a nominal voltage setting of
120 V.
Phase Undervoltage
Pickup #1, #2, #3 5 to 180 V 1 V

0.5 V or

0.5%

0.8 V or

0.75%*
Time Delay #1, #2, #3 1 to 8160 Cycles 1 Cycle

1 Cycle or

0.5%**
* When both RMS and Line‑Ground to Line‑Line VT connection is selected.
**When RMS (total waveform) is selected, timing accuracy is
O
20 cycles or

1%.
†
Select the greater of these accuracy values. Values in parentheses apply to 1 A CT secondary rating.
21
24
27