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The multi-OCR is a microprocessor based digital type protective relay that has 3 phases overcurrent and ground overcurrent element which are provided with inverse, very inverse, extremely inverse, and definite time, curkes. OCR and GOCR can set the functions independently. The relay may be supplied in drawout type case or fixed type case according to customer's requirement. Its protecting coordination is configured with (1)one of time inverse curves and instananuouse setting, or (2)definite time setting The relay works more precisely and correctly than electmechanical type or static type, because of appling advanced digital converting technology. |
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Rating |
DOG-M51 (Non Draw out) DOG-M51 (Draw out) |
Rating |
Rated current Frequency Auxiliary Voltage Ambient temperature |
1AC 5A 150/60Hz ±5% 1AC/DC 110V (80) 1-10℃ to +60℃ |
Current Setting |
-OC- Overcurrent range Instantaneous
-EF- Overcurrent range Instantaneous |
12~10A/steps of 0.5A 120~80A/steps of 5A
10.2~2A/steps of 0.05A 11~40A /steps of 0.5A |
Time Setting & Curve |
-OC- Overcurrent time Lever Instantaneous
*Normal inverse time
*Very inverse time
*Extremely inverse time
*Definite time
Resetting Value Reset time |
10.25~40 Lever (steps of 0.25 lever) 1Less than 40
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※ I : Fault current(%) ※ tp : time lever |
1> 95% 1< 100ms |
Burden |
Overcurrent Earth Fault Aux. Voltage |
0.5VA 0.5VA 12VA(AC), 6W(DC) |
Contacts |
Output Relay Trip & Alarm contact capacity 111111111111111111111111111111111 Make
111111111111111111111111111111111Break |
OC : Trip 1c, Alarm 1a
AC 240V 10A (L/R=0ms) DC 1000W 0.5sec (L/R=0ms) AC 240V 3A (L/R=0ms) DC 30W 0.5sec (L/R=0ms) |
Indicator |
Operating start CPU RUN Operating |
LED(Red) LED(Green) LED(Red)Manual Reset |
Operating time |
Over Current Normal inverse time
Very inverse time
Extremely inverse time |
Earth Fault Normal inverse time
Very inverse time
Extremely inverse time
Instantaneous time | |
Lever #10 300% 6.3sec 700% 3.5sec 300% 6.75sec 700% 2.25sec 300% 10sec 700% 1.67sec |
Lever #5 300% 3.15sec 700% 1.76sec 300% 3.37sec 700% 1.12sec 300% 5.0sec 700% 0.83sec Lessthan 0.01sec | |
1Degree Protection |
1IP52 |
1Thermal Withstand Capability |
1For 1s 80×In Continuously 3×In |
1Malfunction |
110Hz 5mm double amplitude 30s each in X and Y directions 116Hz 2.5mm double amplitude 600s each in X, Y and Z 1directions |
1Destruction |
1300㎨(approx. 30G) 3times each in 3 directions |
1Dielectric Withstand
1Insulation resistance at 500V 1Impulse Voltage Withstand 1Surge transient simulator 1Weight |
12kV for 1minute between all terminals and case earthed. 1 >100㏁ 15kV-1.2/50㎲ 12.5kV 1㎒/200Ω 12.2㎏ | |
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