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The relay type SSG is intended for the protection against over- loads, short circuits and earth faults in radial network, ring mains or variable structure networks, whatever neutral earth arrange- ments (isolated, resonant-earthed, through resistor or direct earthed). Suitable to Enel DK5600 requirements s Types with undervoltage (27) and T T live line monitoring (59T) functions li li li are available. a a , They may be utilized as voltage T T . control in load shedding and auto- c c matic repowering of transformers. m m > I .. I , I .., I , U , ϕ ..- Events 1...8 - Signal recording 67N 50N51N L1 L3 θL 1 E E E Control functions & Logic selectivity COMMUNICATION- Modbus RS485- RS232 The relay protection functions have two setting parameters configu-rations (BANK A or BANK B). Activation of the two data sets is con- trolled by logical input or communications interfaces. Three phase current inputs and one residual current input, with nominal currents independently selectable at 1A or 5 A (different order codes to select). Three phase voltage inputs and one residual voltage input. > Flush or projecting mounting; current measuring circuits provided with short-circuiting devices. > The Breaker failure function (BF) may be associated to all SSG pro- tection thresholds. > SSG - Flayer - 06 - 2006 size="-1">

The relay measures all the phase and residual currents and voltages, making them available for reading on a display or to communication interfaces. Signals are sampled 20 times per period and optimum filtering is made through combined use of analog and digital filters. The overcurrent directional function makes use of a special criterion based on a phase lock loop algorithm: this feature allows the relay to correctly operate in the presence of a solid three-phase short circuit close to the measuring point, where the line voltage drops to zero. For want of open delta CT, the residual voltage...

Reference voltage U > R 100VNominal voltage > U > N 50...130V programmablePermanent overload 2 Mounting flush or projectingTerminals screw connectionMass 3.5 kg U > R Rated consumption (any phase) ≤ 0.5 VA > Reference voltage U > ER 100VNominal voltage Reference standards EN60255-5High voltage test 50Hz 2 kV 60 sImpulse voltage withstand (1.2/50 U > EN 80...120V programmablePermanent overload 2 U > ER N s) 5 kVInsulation resistance >100 M Rated consumption (any phase) 0.5 VA 8 > Quantity 2Max permissible voltage Reference standards EN61000-4-29 U auxMax consumption (energized) 2 > 1 MHz...

Pickup I > E > (definite-time characteristic) 0.002...10.00 I > EN Time delay t > E > (definite-time characteristic) 0.05...180 sPickup > L1L2 L3 I > ES (inverse-time characteristic) 0.002...0.500 I > EN Time delay t > ES (inverse-time characteristic) 0.10...60.0 sPickup I > E >> 0.002...10.00 I > EN Time delay t > E >> (definite-time characteristic) 0.04...10.00 sPickup > NA I > E >>> 0.002...10.00 I > EN Time delay t > E >>> (definite-time characteristic) 0.04...10.00 s > dadn Pickup U > E > 0.01...0.20 U > EN na Time delay t > UE > (definite-time characteristic) 0.05...180 sPickup > A6A3...