19
Low-set earth-fault stage I
0
>
- current setting range 0.1…0.8 x I
n
- operation modes to be selected
- definite time operation
- operating time t
0
> 0.05…300 s
- inverse definite minimum time (IDMT)
mode as per IEC 255-4 and BS 142 Extremely inverse
Very inverse
Normal inverse
Long time inverse
- special type inverse characteristics RI-type inverse
RXIDG-type inverse
- time multiplier k
0
0.05…1.0
High-set earth-fault stage I
0
>>
- current setting range 0.1…10 x I
n
and ∞
- operating time t
0
>> 0.05…300 s
Control module SPTO 1D2
Control functions
- status indication for maximum three objects (e.g. circuit breakers, disconnectors, earth switches)
- configuration freely programmable
- remote or local control (open and close) for one object
- feeder-based interlocking freely programmable
Measurement functions
- phase currents, measuring range 0…2.5 x I
n
- phase current measuring accuracy better than ±1 % of I
n
- active and reactive power measurement via mA-inputs, external measuring transducers are needed
- mA measuring input current range -20…0…20 mA
- power measuring accuracy better than ±1 % of maximum value of measuring range
- energy measurement via pulse counter input or by calculating of measured power
- local and remote reading of measured data as scaled values
Data communication
Rear panel
Connection RS-485, 9-pin, female
Bus connection module for rear connection
- for plastic-core optical fibres SPA-ZC 21C BB
- for glass-fibre optical fibres SPA-ZC 21C MM
Bus connection module for separate mounting
- for plastic-core optical fibres SPA-ZC 17C BB
- for glass-fibre optical fibres SPA-ZC 17C MM
Front panel
- connection RS 232, 9-pin, female
Data code ASCII
Selectable data transfer rates 4800 or 9600 Bd
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