Ўзбекистон республикаси олий ва ўрта махсус таълим вазирлиги наманган муҳандислик – Қурилиш



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5.1.3. IEC 61730 Safety Standard 
The safety standard must be considered to protect against: 

Electrical hazards: conductive insulators, ground resistance, rapid access to 
conductors, protection circuit breakers (high voltage, reverse polarity, partial 
discharge (differential breaker). 

Mechanical hazards: susceptibility to fracture. 

Thermal Hazards: Determine the maximum and minimum temperatures that 
allow minimal expansion and contraction of the components of the board while 
maintaining its durability and non-cracking, or deformation of its surface, or 
the impact of the surrounding frame. 

Fire Hazard: the fire resistance of the board components. 
5.1.4. NOCT IEC 60904-5 (Nominal Operating Temperature Standard) 
The Normal Operation Cell Temperature NOCT is directly dependent on 
radiation, wind speed, and ambient temperature, and is universally applicable to all 
solar panels. 
The test is conducted outdoors as the test preparation requires: 

Inclination angle: 45 ° from the horizon. 

Solar radiation: 800 [W /
]. 

Ambient temperature: 20 ° C. 

Wind speed: 1 [m /s]. 

Working at no load: open circuit. 
The plate temperature sensor is installed on the back side of the electrode 
solar panel between the two central cells and the temperature is measured 
intermittently, then the mean of these readings is taken. Moreover, it can be said: 
The nominal operating temperature of the panels can range from 45 to 50 and they 
vary from place to another depending on the latitude of the place. Locally, and 
based on a set of measurements made at the Higher Institute of Applied Sciences 
and Technology in Damascus, the nominal operating temperature of the cell was 
determined to be 48. 
5.1.5. Heat standard IEC 61891 
• 
Its purpose is to determine the following: short circuit thermal factor, 
open circuit voltage coefficient, and maximum power coefficient at radiation 1000 
[W /
]. 
• 
Two methods of measurement are used by the solar emulator: either 


232 
during heating or cooling of the plate (for example: from 25 ° C to 55 ° C), and at a 
step of every 5[°C], the solar emulator takes a curved I-V measurement (taking 
into account determination
، 
، 

Values are drawn as a function of T for each set of data. The coefficients (α, 
β and δ) are calculated from the slope of the three straight line graphs (note: the 
functions must appear linearly), Figure 1 shows the curve slope of the constants, 
and as a function of T the temperature of the LG-solar panel -neon2-60cell-325w-
330W [5]. 
Figure 1 the curves of the 

and 
constants as a function of T 
temperature 
Note that β (for
) and δ (for
) are the most sensitive to temperature 
changes. Both carry a "-" sign, which indicates that
and 
decrease with 
increasing temperature, while α (for
) has a "+" sign, although its value is much 
smaller than β and δ. 
• α ranges from 0.026% to 0.07% per degree Celsius. 
• β ranges from -0.30% to -0.45% for each degree Celsius. 
• δ ranges from -0.39% to -0.48% for each degree Celsius. 

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