SIDAC Discharge Reactors ■ Three-phase reactors

SIDAC Discharge Reactors ■ Three-phase reactors
© Siemens AG 2009
SIDAC Discharge Reactors
Three-phase reactors
■ Application
Discharge reactors for compensation equipment:
Capacitor banks in reactive-power compensation equipment are
connected and disconnected to and from the mains as required.
Connecting the mains to a capacitor bank that is not fully discharged causes mains overvoltages that can damage connected devices. To enable the fastest possible reconnection of a
capacitor bank after disconnection, the capacitors must be rapidly discharged. Discharge reactors offer significant advantages
here. Compared to the discharge resistors previously used, they
cause significantly lower losses and reduce the ambient temperature rise, which serves to extend the service life of the phase
shift capacitors.
The discharge reactors meet the requirement for permanently installed and connected discharge devices, as well as the requirement for short capacitor discharge times of just a few seconds.
The high AC resistance means that power losses during operation are lower than 1.8 W, and therefore negligible.
Discharge reactor for low-voltage compensation
34
U
V
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PD30_00006a
72,5
89
U VW
45
5
54
Dimensional drawing and circuit diagram
■ Technical specifications
Recommended supply voltage UN
3 AC 230 V to 690 V AC
Operating losses
< 1.8 W
No-load current
< 4.5 mA
Total weight
0.5 kg
Frequency
50 … 60 Hz
Degree of protection
IP40 acc. to DIN 40050
Connection
Terminals for 0.75 mm2 to 2 x 2 mm2
Inductance
9
230 V 730 μH
400 V 710 μH
525 V 670 μH
690 V 350 μH
Discharge time
230 V less than 20 s for 50 kvar
≥ 400 V less than 20 s for 100 kvar
Permissible discharges
1 x/(1 min (100 kvar))
Temperature classes
ta 40 °C/B
Standards/approvals
The reactors comply with EN 61558-2-20
Dimensions
See Dimensional Drawing
Permissible ambient temperature during operation
–25 °C ... +55 °C (average over 24 h)
Storage temperature
–25 °C ... +70 °C
Installation
Indoors
Natural air cooling (S) acc. to DIN 41751
Order No. 4EJ99 00–0EG
Supply voltage
Capacitor bank output
Discharge time
230 V
Up to 25 kvar
< 10 s
Up to 50 kvar
< 20 s
Up to 100 kvar
< 40 s
Up to 25 kvar
< 5s
Up to 50 kvar
< 10 s
Up to 100 kvar
< 20 s
400 V ... 690 V
Siemens LV 60 · 2010
9/3
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