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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)
| | | | - 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 | | | 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˚)
| Time Setting & Curve | 1Operating 1Time tap 1Reset Value 1Reset time | 10.05~10s (steps of 0.05sec) 1> 95% 1< 100ms
| 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
| 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 |