How to protect solar street lights against lightning

Solar street light system is now widely used in varies countries and territories. It is easy installation, flexible, stable and long life time. The solar street light is typically consisted by solar panel, junction box, inverter, led street light, battery and control system, etc. A lot of electrical/electronic devices are integrated in a small and limited space. It’s no doubt that, lightning and harmful surge are the disasters. SunMaster provides comprehensive and effective solutions for Solar Power street light.

In accordance to IEC62305 and the special requirement of solar DC system, below should be considered when categorizing surge protection zones and selecting/installing the solar power system:

  1. 1, Surge protection zone (LPZ0…3);
  2. 2, Relative SPD test waveshapes (8/20us or 10/350us);
  3. 3, Voltage protection level;
  4. 4, Open circuit voltage at the DC side;
  5. 5, Harmonic wave interference.

In accordance to:

  • EN 50539-11: Low-voltage Surge Protective Device for Specific application including d.c.
  • IEC 62305: Lightning Protection
  • IEC 61312:Lightning Protection against  Electromagnetic Impulse
  • IEC 61643-11: Low-voltage Surge Protective Devices
  • GB 50057: Design Code for Protection of Structures against Lightning

Solution

Solution Ⅰ:Direct strike lightning protection

Most solar street light work in harsh locations, making them susceptible to damage from volatile weather.Ligthing damage particularly to solar street light,is often attributed to inadequate direct strike lightning  protection, incorrect or insufficient bonding and earthing(grounding),and insufficient transient protection.  SunMaster solar street light provide the professional lighting rod and earthing rod to prevent the direct lighting.

Single-needle-lightning-rod-1 How to protect solar street lights against lightning

See the bellowing photo and specification:

Single needle lightning rod: Single needle lightning rod of the lightning protection function is that it can receive the lightning and lead the lightning down to the earth invitiatively. And then the lightning through the down lead and grounding device to release lightning current into the earth,and the protected antenna tower or buildings don’t occur flank attack and electrification. Low impedance of the metal inner conductor ‘s down lead to release lightning current into earth. And the internal has a attenuator,which can reduce the direct lightning shock.

Product feature:

* low cost, easy to install

* Corrosion resistant, conductive performance is good, the maximum discharge current (KA) 300.

* Maintenance free, not need powder supply.

SolutionⅡ:Induction strike lightning protection

In additional to a direct lighting strike to the solar panel LED street lamp system,high-energy over-current and over-voltage transients induced indirect lighting strikes can cause significant damage when the system are left unprotection.SunMaster power surge protector box specially provides surge protection for power supply lines. When induction thunder wave invaded power supply transmission line, power surge protector will react in low impedance state with nanoseconds response speed, discharge the lightning current to the earth quickly, moreover, in order to ensure the safety running of electric equipment, the surge protector will limit the overvoltage caused by lightning within withstand range. This Product with hot melt and over-current protection function, it will break away from power lines automatically when the deteriorating occurred, and don’t affect the normal operation of equipment.It is widely used to prevent over-voltage from damaging DC power system and equipments, especially in solar photovoltaic system. Also applied in several DC power system, such as DC distribution board, DC power supply equipment, DC distribution box, electronic information system cabinet and the output terminal of second stage power equipment.

Features:

  1. Temperature control circuit break technology, built-in over-current protection circuit, to completely keep away from fire disaster
  2. International famous components and advanced manufacturing technique
  3. Big discharger current capacity, low residual voltage
  4. Remote alarm connect point (optional)
  5. Clear and intuitive working condition
  6. Easy installation and maintain
  7. Exquisite process, can work under the hostile environment for a long time, like acid, alkali, dust, salt fog, wet, etc

Specification

ModelAM10-12
Nominal operating voltage Un12VDC
Max operating voltage(Uc)18VDC
Nominal discharge current(kA)5KA
Max discharge current (kA)10KA
Protected level≤100V
Response time≤25ns
flame retardant rating (UL94)V0
Protection LevelIP20
Dimension(mm)Single connection: 90*18*69mm
Connecting diameter(mm2)+/- line: 6 mm²above, ground line: 10 mm²above
Working conditionsTemperature: - 40 ~ + 85℃ ; Relative humidity:≤95%(25℃); Elevation≤3km

Product installation diagram

Product-installation-diagram How to protect solar street lights against lightning

2018-12-21T10:13:51+00:00Blog, ENG Blog|