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Directional ground relay being non-grounded type ground protection is atviated by zero ghase sequence voltage(tertiary of GTP installed on bus line) and zero phase sequence current (secondary current of ZCT installed on each phase)
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- A precision filter circuit is employed at input end for accurate determination of the detection even when signal wave form is distorted. - Since the burden of zero phase sequence voltage (V 0 ) put end is minimized, any single unit of small capacity ground potential transformer (GPT) can support several or more relays at time. - Taps provided for time limit setting offer convenient means of reserverprotection |
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Model |
1DDG-M22 (Non Draw out) 1DDG-M22D (Draw out) |
Rating |
1GPT input 1ZCT 1Frequency 1Auxiliary Voltage 1Ambient temperature |
1AC 110V / 190V 1200mA/100mA 150/60Hz ±5% 1AC/DC 110V (86~260V) 1-10℃ to 60℃(with no icing) |
Current Setting |
1Operating 1Current Setting tap(I 0 ) 1Voltage Setting tap(V 0 ) 1Characteristic angle 1Zone of operating |
10.1~1.0A(0.1A step)±10% 15~82.5V (steps of 5V) 10~180˚ (steps of 5˚) 1± 90 (Error ±10˚)
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Time Setting & Curve |
1Operating 1Time tap 1Reset Value 1Reset time |
10.05~10s (steps of 0.05sec) 1> 95% 1< 100ms
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Burden |
1G.P.T terminal(G 1 , G 2 ) 1Aux. Voltage |
1Less than 1VA 18VA(AC) |
Contacts |
1Output Relay 1Trip & Alarm contact capacity 11111111111111111111111111111111Make
11111111111111111111111111111111Break |
1Trip 1c. Alarm 1a
1AC 240V 10A (L/R=0ms) 1DC 1000W 0.5sec (L/R=0ms) 1AC 240V 3A (L/R=0ms) 1DC 30W 0.5sec (L/R=0ms) |
Indicator |
1Operating(trip) |
1LED
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Operating time |
1Over voltage 1Under voltage |
1Inverse or definite time |
1Degree Protection |
1IP52 |
Vibration resistance |
1Malfunction |
110Hz 5mm double amplitude 30s each in X and Y directions 116.7Hz 2.5mm double amplitude 600s each in X, Y and Z 1directions |
Shock resistance |
1Destruction |
1300㎨(approx. 30G) 3times each in 3 directions |
Insulation to IEC 255 |
1Dielectric Withstand 1Insulation resistance at 500V |
12kV for 1minute between all terminals and case earth 1>100㏁ | | | | 1Directional Groud Relay[67] DDG-M22 1contents: Directional ground relay being non-grounded type 1ground protection is atviated by zero ghase 1sequence1voltage (tertiary of GTP installed on bus line) and zero 1phase sequence current
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