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Definitions, Measuring Conditions Definitionen, Messbedingungen
Spark-over voltages Ansprechspannungen

1000 V Impulse spark-over voltage Ansprechsto spannung 800 1 kV/us Dynamic response Dynamisches Ansprechverhalten 100 V/us

RAB0218-D

600 Static response Statisches Ansprechverhalten 400

DC spark-over voltage Ansprechgleichspannung

100 V/s 200

0,5

1,5

2,5

Fig. / Bild 17

DC spark-over voltage Vsdc This value is determined by applying a DC voltage with a low rate of rise dv/dt = 100 V/s (Fig. 17). Nominal DC spark-over voltage VsdcN This is a rated value used to designate a surge arrester. The operating characteristics and tolerances as well as limit and test values are referred to VsdcN. It represents the individual values of the DC spark-over voltage, which are subject to statistical variations due to the physical phenomena of gas discharge. Tolerance of VsdcN in % The tolerance is generally specified as a percentage of VsdcN. Tolerance specifications take into account individual and batch variations in arrester production. Impulse spark-over voltage vsi The impulse spark-over voltage characterizes the dynamic behavior of a surge arrester. The values specified in the product part refer to a voltage rise rate of dv/dt = 100 V/us

and 1 kV/us (Fig. 17). Complete vsi distribution data is available upon request. Nominal impulse discharge current idiN Rated discharge current of the 8/20 us wave (Fig. 18). Requirements of ITU-T and DIN VDE: 10 discharges. ITU-T: no accumulation of the DUT temperature during consecutive discharges. Nominal alternating discharge current IdaN Rated rms value of an AC current at 50 Hz, 1 s. Requirements of: ITU-T: 10 discharges (no accumulation of the DUT temperature). DIN VDE: 5 discharges. Maximum single-impulse discharge current Single loading with an 8/20 us wave (Fig. 18). Testdata of impulse units for impulse currents 10/250 us, 10/350 us and 10/1000 us are also available.

AC discharge current RMS value of AC current for 9 cycles at 50 Hz (in accordance with RUS PE-80 11 cycles at 60 Hz). Maximum follow-on current For the type series L71* and EF* (see page 40) we specify this performance feature as the maximum permissible current which may flow from the supply current source through the arrester in the interval between the decay of the surge and the following zero crossing of the AC voltage. This discharge may be repeated ten times during an interval of 30 s. Useful life 1 discharge of rated discharge current 10/350 us up to 300 discharges of rated discharge current 10/1000 us. Further technical data upon request.

EPCOS AG

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