Analysis of the reference of voltage demand in lampholder decision criteria

1 selection principle of lamp holders for HID lamps with triggers

For HID luminaires with triggers, the lamp holder is subjected to a pulse voltage from the trigger during startup and is subjected to a sinusoidal voltage from the power supply during normal operation. When choosing a lamp holder for use in such a luminaire, besides paying attention to the rated voltage on the lamp holder, pay more attention to the pulse voltage from the trigger that may be withstood.

The lampholder contact as part of the pulse voltage circuit shall have a pulse peak voltage not greater than the rated pulse voltage value marked on the lamp holder, or, if there is no such mark on the lamp holder, it shall not be greater than: 2 5kV rated voltage 250V lamp holder; 4kV rated voltage 500V screw socket; 5kV rated voltage 750V screw socket.

The above selection principle is based on IEC 60598-1 lamps Part 1: General requirements and tests! Medium 4 4 5.

The difference in pulse peak voltage determines the difference in clearance requirements. 2 The minimum clearance corresponding to 5kV is 1 5mm; the minimum clearance for 4kV is 3mm; the minimum clearance for 5kV is 4mm.

The difference in sinusoidal operating voltage determines the creepage distance and clearance requirements as well as the electrical strength requirements. Is the IEC 60238 standard capable of withstanding pulse levels for AC sinusoidal voltage (50Hz 60Hz)? The minimum distance requirement for the 250V (PTI600) is 15mm for the minimum creepage distance and clearance; the minimum creepage distance and clearance for the 500V (PTI 600) is 3mm; the minimum creepage for the 750V (PTI 600) The distance and clearance are 4mm. The withstand voltage required for electrical strength is 2U + 1 000 (V), the corresponding withstand voltage of 250V is 1 500V; the corresponding withstand voltage of 500V is 2 000V; the corresponding withstand voltage of 750V It is 2 500V.

It is not difficult to see from the above analysis that the minimum clearance value required for the pulse peak voltage is equivalent to the minimum creepage distance and clearance required for the sinusoidal voltage, so both the lamp standard and the lampholder standard, for the pulseless peak voltage flag. The lamp holder is considered to withstand the corresponding pulse peak voltage described above.

Usually we see that the lamp holder is not marked with the pulse peak voltage, then when it is necessary to mark it, the lamp holder standard IEC 60238 screw socket 7 1 mark tells us: if the rated pulse voltage is higher than the following value, it should be Marked, otherwise only the rated voltage is required:

2 5kV rated voltage 250V lamp holder; 4kV rated voltage 500V lamp holder.

According to the pulse peak voltage marked by the lamp holder, the clearance is evaluated according to the IEC 60238 standard. According to the rated voltage marked by the lamp holder, the creepage distance, clearance and electrical strength shall be assessed in accordance with IEC 60238.

IEC 60662 high pressure sodium lamp! The pulse peak voltage or pulse height of the ballast design required by the standard is as follows: 1. The pulse height of the externally triggered 150W, 250W, 400W, and 1 000W high pressure sodium lamps is between 2 800 5 000V. If the rated pulse voltage of the lamp holder is 25 kV, according to the above selection principle, the lamp holder cannot be selected in the lamp. It is necessary to select a lamp holder whose rated pulse voltage is at least equal to the peak voltage of the pulse to be withstood.

1 ballast design pulse height required by high pressure sodium lamp

2) Type of lamp voltage:

Low voltage, with LV mark, lamp voltage range < 70V; high voltage, with HV mark, lamp voltage range 70 180V; ultra high voltage, with EHV mark, lamp voltage range > 180V.

2 Selection principle of lamp holders for fluorescent lamps with electronic control devices

Fluorescent lamp standard IEC 60081 double-ended fluorescent lamp performance requirements and IEC 60901 single-ended fluorescent lamp performance requirements in the starter design information (as shown and shown) tell us: whether it is a double-ended fluorescent lamp or a single-ended fluorescent lamp, the minimum pulse voltage required is not Above 1kV, the actual formed pulse voltage peak is below 2kV. The effect of the pulse voltage on the lampholder may be disregarded if the minimum clearance required for the peak value of the pulse voltage is less than the minimum clearance required for the AC sinusoidal voltage rating. For most fluorescent fixtures, it is generally not necessary to consider the effect of the pulse voltage on it.

In general, the choice of lamp holder for a fluorescent luminaire with an electronic control unit only needs to be concerned with its rated voltage, which depends on the output voltage of the control device from the lamp that can be withstood on the lamp holder.

2 minimum pulse voltage required for double-ended fluorescent lamps

3 minimum pulse voltage required for single-ended fluorescent lamps

In a luminaire containing an electronic control unit, there may be cases where the lamp circuit rated voltage is greater than the rated power supply voltage of the luminaire, as indicated by the nominal value Uout marked on the control unit of the lamp. The nominal value Uout marked on the control unit of the lamp shall not be greater than the rated voltage value marked on the base.

The above selection principle is based on IEC 60598 1 luminaires Part 1: General requirements and tests 10 2 Insulation resistance and electrical strength %: The test voltage applied to the lamp circuit components is calculated by Uout marked on the control unit of the lamp instead of U.

For lampholders for single-ended fluorescent lamps, the nominal value U out of the markings on the control unit of the lamp is different between the live parts of the different polarities in the socket and between the live parts and the external metal parts. The electrical strength requirements are different; for lamp holders used in double-ended fluorescent lamps, the nominal value U out of the markings on the control unit of the lamp is different, the requirements for the electrical strength between the live parts of the lamp holder and the external metal parts are different. .

The nominal value Uout marked on the electronic ballast is hampered by the minimum trigger voltage requirement of the source used for the electronic ballast. Light source standard IEC 60081 double-ended fluorescent lamp performance requirements! And IEC 60901 single-ended fluorescent lamp performance requirements! About? % of the design information for high frequency ballasts should be of interest (as shown and shown). The rating of the electronic ballast marker U out used cannot be lower than the minimum trigger voltage in the sum.

The starting voltage required for the elongated tube is high, that is, the rated value U out of the required mark is high, and attention should be paid when selecting the lamp holder voltage.

4 minimum trigger voltage of double-ended fluorescent lamps

5 minimum trigger voltage of single-ended fluorescent lamps

If the electronic ballast marking used has a rating U out of 450V, a fluorescent lamp holder with a rated voltage of 250V cannot be used in the luminaire, and a fluorescent lamp holder with a rated voltage of at least 450V is required.