Lighting Capacitors

Technical Characteristics:

Dielectric: Aluminium metallized polypropylene film
Capacitance tolerance: ± 10% (on request ±5%)
Frequency: 50 - 60 Hz
Temperature range: -25 <> +85°C
Discharge Resistor: <50V within 1 minute
Tan d: At Vn, 50Hz, 20°C £ 25 x 10-4
Test Voltage: Terminals / Case 2kV
Test Voltage: Terminal / Terminal 375Vac 660Vac
Can Type: Aluminium or Self-extinguishable plastic
Base Standard: EN 61048, EN 61049

Power Factor Correction

Discharge lamps (Fluorescent lamps, halogen metal vapour lamps, mercury vapour lamps and sodium vapour lamps) require suitable chokes or leakage reactance transformers for ignition and also for current limitation during discharge.

Due to their inductance, the power factor or cos j is depending on the type, between 0.5 and 0.7.

Electricity companies therefor require that the wattless power (sin j) from the chokes or transformers be suitably corrected to cos j = 0.9.

To improve the power factor, capacitors ideally designed for the widest range of operating climatic and thermal conditions, should be used.

Capacitors can be for single lamps or group correction (parallel types), as well as for series use (where the choke and the capacitor are in the series).

Because capacitors can retain their change for a considerable time after they have been disconnected, international specifications stipulate the use of special discharge resistors to ensure that, one minute after the disconnection, the voltage across the capacitor is reduced to less than 50V.

These resistors are normally mounted across the winding of the capacitor or inside the pushwire connector.

Power Factor Correction Using Capacitors In Series Connection

The power factor is corrected by connecting one capacitor in series with one of the ballasts. This is also known as "semi-resonant circuit".

The value of the capacitor's capacitance shall be chosen so that the capacitive current resisting of this connection compensates the inductive current of the other part.

Due to the serial connection of choke and capacitor, the voltage developed across the capacitor while the lamp is energized exceeds the line voltage. The series capacitor must therefore be rated for an appropriately higher voltage. An additional rise in voltage occurs during the brief starting period, which must also be taken into consideration when the rating of capacitor is chosen.

The dual circuit has the additional advantage that the combined light produced by the two lamps is almost completely free of flicker since the current through one lamp is always a maximum while that through the other is zero.

Also, this type of power factor correction is more economic than parallel connection, and the only one permissible if the supply carries an AF signal used for central control purposes.

Power Factor Correction Using Capacitors In Parellel Connection

Each separate lamp (single lamp correction) or group of lamps controlled by a connection switch (group correction) can be power factor corrected by shunting a capacitor (c) across the line. (see below).

The capacitance value required for the correction of individual lamps can be found in the next sections classified according to the type of lamp.

If group connection is used, then the capacitor must have a value equial to the sum of the capacitance values that would be required to correct individual lamps.

Power Factor Correction Of Fluorescent Lamps

Power factor correction capacitor required for a single fluorescent lamp at the stated voltage.

Powe Input (W)

Type of Lamp

Capacitance for 1 Lamp

220V@10% (µF)

440V@5% (µF)

4-13
4-13
4-13
4-13
4-13
4-13
4-13
4-13

L 4 W/25
L 6 W/25
L 8 W/25
L 13 W/25
TL 4 W
TL 6 W
TL 8 W
TL 13 W

2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.00

 

15
15

L 15 W/..2
TL-D 15 W

4.50
4.50

 

16
16

L 16 W/..2
TL-D 16 W

2.50
2.50

 

18
18

L 18 W/..2
TL-D 18 W

4.50
4.50

2.90
2.90

20
20
20

L 20 W/..
TL 20 W
L 20 W/..X

4.50
4.50
4.50

2.90
2.90
 

22
22

L 22 W/25C
TL-E 22 W

5.00
5.00

3.20
3.20

30
30

L 30 W/..2
TL-D 30 W

4.50
4.50

3.00
3.00

32
32

L 32 W/..C
TL-E 32W

5.00
5.00

3.60
3.60

36
36

L 36 W/..
TL-D 36 W

4.50
4.50

3.60
3.60

38
38
38

L 38 W/.. *
L 38 W/.. *
TL 38 W *

4.50
6.00
6.00

3.60
4.40
4.40

40
40
40
40
40
40
40

L 40 W/..
L40 W/..S
TL 40 W
TL-E 40 W
L 40 W/..X
L 40 W/..1
L 40 W-1

4.50
4.50
4.50
4.50
4.50
6.00
6.00

3.60
3.60
3.60
3.60
 
4.40
4.40

58
58

L 58 W/..
TL-D 58/W

7.00
7.00

5.70
5.70

65
65
65
65

L 65 W/..
L 65 W
L 65 W/..UK
TL-UK 65 W

7.00
7.00
9.00
10.00

5.70
5.70
6.80
6.80

115
115

L 115 W/..
TM-M 115 W

18.00
18.00

12.20
12.20

140
140

L 140 W/..
TL-M 140 M

18.00
18.00

12.20
12.20

* With 40W Choke

Power Factor Correction Of Other Discharge Lamps

Power factor correction of high-pressure mercury vapour lamps, sodium vapour lamps and halogen metal vapour lamp is achieved by parallel connection of capacitors.

The power factor of these discharge lamps depends on operating equipment, and is 0.5 to 0.7 if reactance chokes are used, and approximately 0.3 in the case of leakage reactance transformers (see below).

Power Factor Correction Of Sodium Vapour Lamps

Powe Input (W)

Type of Lamp

Capacitance for 1 Lamp

220V@10% (µF)

440V@5% (µF)

18

All

5.00

 

35

All

20.00

 

55

All

20.00

 

90

NA 90 W

26.00

 

90

SOX 90 W

30.00

 

135

All

45.00

 

180

All

40.00

 

Power Factor Correction Of High Pressure Sodium Vapour Lamps

Power Input (W)

Type of Lamp

Capacitance for 1 Lamp

220V@10% (µF)

440V@5% (µF)

50

All

10.00

 

70

All

12.00

 

150

All

20.00

 

250

All

36.00

 

400
400
400

Son 400 W
Son-T 400 W
All

45.00
45.00
50.00


 
 

1000
1000

Son 1000 W
Son-T 1000 W

120.00
120.00


 

1000

All

100.00

 

Power Factor Correction Of High Pressure Mercury Vapour Lamps

Power Input (W)

Type of Lamp

Capacitance for 1 Lamp

220V@10% (µF)

440V@5% (µF)

50

All

7.00

 

80

All

8.00

 

125

All

10.00

 

250

All

18.00

 

400

All

25.00

 

700

All

40.00

 

1000

All

60.00

 

2000

All

 

37.00

Power Factor Correction Of Halogen Metal Vapour Lamps

Power Input (W)

Type of Lamp

Capacitance for 1 Lamp

220V@10% (µF)

440V@5% (µF)

150

 

20.00

 

250
250
250

HP-T 250 W
HP 250 W BU
Rest

20.00

20.00

32.00

 
 
 

400
400
400
400

HP-T 400 W
HP-TD 400 W
HP-BU 400 W
Rest

25.00
25.00
25.00
35.00

 
 
 

1000
1000

HP-T 1000 W
Rest

65.00
85.00

 
 

2000
2000
2000
2000
2000

HQ-T 2000 W/D
HQ-TS 2000 W/D
HQI-T 2000 W
HQI-T 2000 W/N
HP-T 2000 W/380

125.00
125.00
125.00
125.00
125.00

60.00
60.00

37.00
37.00

3500

All

 

100.00 

Print Window | Close Window