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Technical data

NGRM7xx_D00292_07_M_XXEN/02.2022

Tolerance t

trip

when set to

RMS............................................................................................................................................................–20…0 ms

Fundamental ......................................................................................................................0…+150 ms (filter time)

Harmonics...........................................................................................................................0…+150 ms (filter time)

Measuring current transformer ratio primary ..........................................................................................................1…10,000

Measuring current transformer ratio secondary....................................................................................................... 1…10,000

Measuring range........................................................................................................................................................ 2 x I

NGR nom

Coupling

for U

sys

≤ 4.3 kV.......................................................................................................... CD1000, CD1000-2, CD5000 (20 kΩ)

for U

sys

> 4.3 kV ...................................................................................................................... CD14400, CD25000 (100 kΩ)

Monitoring U

NGR

with R

= 20 kΩ............................................................ DC / 50/60 Hz / 50…3200 Hz; (400/√3) … ≤ (4300/√3) V

NGR

with R

= 100 kΩ..............................................................DC / 50/60 Hz / 50…3200 Hz; > (4.3 /√3) …(25/√3) kV

Measuring range....................................................................................................................................................1.2 x U

NGR nom

Overload capacity ...............................................................................................................................................2 x U

NGR

for 10 s

Measurement accuracy ................................................................................ 2 % of U

NGR nom

with U

NGR nom

= (U

sys (L-L)

/√3)

Voltage response value ..............................................................................................................................10…90 % U

NGR nom

Response delay, ground-fault relay..............................................................................................................≤ 40 ms (±10 ms)

Response delay, trip relay (configurable).....................................................................................................100 ms…48 h, ∞

Tolerance t

trip

when set to

RMS............................................................................................................................................................–20…0 ms

Fundamental ......................................................................................................................0…+150 ms (filter time)

Harmonics...........................................................................................................................0…+150 ms (filter time)

DC immunity in case of active R

NGR

measurement

with R

= 20 kΩ ............................................................................................................................................DC ±12 V

with R

= 100 kΩ.......................................................................................................................................... DC ±60 V

Digital inputs

Galvanic separation .................................................................................................................................................................. no

Length connecting cables ..........................................................................................................................................max. 10 m

............................................................................................................................................................................. DC 0 V, 24 V

Overload capacity ....................................................................................................................................................... –5…32 V

Digital outputs

Galvanic separation .................................................................................................................................................................. no

Length connecting cables ..........................................................................................................................................max. 10 m

Currents (sink) for each output.............................................................................................................................. max. 300 mA

Voltage .................................................................................................................................................................................. 24 V

Overload capacity ....................................................................................................................................................... –5…32 V