PHASE FAIL RELAY
DFR - 021D
■ Description
- DFR-021D is a single open-
phase detector that detects and alarms the open phase or load unbalance based
on the current in normal operating state on a three-phase circuit.
- It uses MCT-A31 as the input converter to monitor and detect three phase load current.
- MCT-A31 uses the second current of Main CT as the input and the I/O current ratio is 3,000:1.
■ Specification
Category Rating
Product Name DFR - 021D
Control Power AC/DC 100 to 240V, 50/60Hz, ＜ 3VA
Rated Input AC 1 to 160A (1'ry current of MCT), 3Phase, 50/60Hz
Reference Current Setting 1.0 to 10.0A (0.1 step)
Unbalance Rate Setting 10 to 90% (1 step))
Start-Lock Time Setting 1.0 to 60.0sec (0.5 step)
Alarm Operation Time Setting 1.0 to 60.0sec (0.5 step)
CT Ratio Setting 5 to 1,000A (5 step)
Alarm Reset Setting Auto Manu
Output Pulse
Setting
Action Mode Pulse Latch
Pulse Retention Time
0.1 to 10.0sec (0.1 step) ㅡ
Motion Precision ± 10% at setting value
Motion Indication LCD blinking red
Insulation Resistance More than 100M Ω with DC 500V Megger
Insulation Strength 2,000V AC rms 1minute
Surge / Impulse IEC255-4 : 5kV (1.2X50 ㎲ ) / IEC255-22-1 : 2.5kV (1MHz)
Case Material LUPOY (Black Color) resin
Category Rating
Product Name MCT-A31
Rated Input AC 1 to 5A (2nd current of CT), 3Phase, 50/60Hz
Rated Output 5A : 1.667mA (3,000 : 1)
Insulation Resistance More than 100M Ω with DC 500V Megger
Insulation Strength 2,000V AC rms 1minute
Case Material LUPOY (Black Color) resin
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