GB/T 33903-2017 Shielding ball type fully automatic solar tracker for
scattered radiation measurement GB/T33903-2017 |tt||Standard compression package decompression password: www.bzxz.net This standard specifies the main technical indicators, test methods, marking and packaging requirements of shielding ball type fully automatic solar tracker for scattered radiation measurement (hereinafter referred to as tracker). This standard applies to the development, production and inspection of trackers.

ICS07.060
National Standard of the People's Republic of China
GB/T33903—2017
Automatic solar tracker of shading ball model for diffuse radiation
Automatic solar tracker of shading ball model for diffuse radiation measurement2017-07-12Release
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of the People's Republic of China
2018-02-01Implementation
Normative references
3 Terms and definitions
Technical requirements
Operating temperature range
Power supply adaptability
Insulation resistance and dielectric strength
Tracking error
Timing error
Load capacity
Capture angle
Capture speed
Shielding angle
Shielding ball diameter
Surface treatment||tt| |Protection level
Corrosion resistance
Test method
Working temperature range
Power supply adaptability
Insulation resistance and dielectric strength
Tracking error
Timing error
Load capacity
Capture angle
Capture speed
Shielding angle
Shading ball diameter
Surface treatment
Protection level
Corrosion resistance
Appendix A (Normative Appendix)
References·
Special tool for tracking error inspection
GB/T33903—2017
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This standard was drafted in accordance with the rules given in GB/T1.1-2009. This standard was proposed by the China Meteorological Administration.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Meteorological Instruments and Observation Methods (SAC/TC507). The drafting unit of this standard is the Meteorological Observation Center of the China Meteorological Administration. The main drafters of this standard are He Xiaolei, Li Jianying, Lv Wenhua, Yu Hejun and Lin Bing. GB/T33903-—2017
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1 Scope
Shadow ball type fully automatic solar tracker for scattered radiation measurement
GB/T33903—2017
This standard specifies the main technical indicators, test methods, marking and packaging requirements of the sunshade ball type fully automatic solar tracker for scattered radiation measurement (hereinafter referred to as tracker).
This standard applies to the development, production and inspection of trackers. 2 Normative references
The following documents are indispensable for the application of this document. For any dated referenced document, only the dated version applies to this document. For any undated referenced document, the latest version (including all amendments) applies to this document. GB/T4208 Protection grade of enclosure (IP code) GB/T6458 Neutral salt spray test (NSS test) for metal coverings GB/T6461-2002 Rating of samples and test pieces of metal and other inorganic coverings on metal substrates after corrosion test GB/T15479-1995 Technical requirements and test methods for insulation resistance and dielectric strength of industrial automation instruments 3 Terms and definitions
The following terms and definitions apply to this document. 3.1
Scattered radiation diffuse radiation; scattering radiation Solar radiation is dispersed by air molecules, clouds and various particles in the air into non-directional radiation without changing its monochromatic composition. [GB/T31163—2014, definition 5.14] 3.2
Tracking error
The angle between the axis of the tracker's solar sensor and the direct sunlight when the tracker is tracking the sun. 3.3
Capture angle
snapangle
The maximum angle between the direct sunlight and the sensor axis when the tracker's sensor can effectively sense the sun's position when the direct solar radiation irradiance is greater than or equal to 120W/m. 3.4
Capture velocity
The tracking angular velocity at which the tracker accurately finds the sun's position in photoelectric tracking mode within the capture angle range. 3.5www.bzxz.net
Shading angle
The shading angle formed by the shading ball on the center point of the pyranometer sensor carried by the tracker. See Figure 1.1
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GB/T33903—2017
Description:
Technical requirements
Center of the shading sphere:
Shading spherical surface
Pyranometer sensor cut surface
Center of the pyranometer sensor carried by the tracker B
Tangent of the shading sphere starting from point B, which is tangent to the shading sphere surface at point C: shading angle.
Figure 1 Schematic diagram of shading angle
4.1 Operating temperature range
Should meet the following requirements:
—Ordinary type: -20℃~+60℃;
Low temperature type: 40℃～+60℃.
4.2 Power adaptability
AC power supply: 220V; fluctuation range: 180V~240V. DC power supply: ≤36V, fluctuation range: within ±2V of nominal voltage. 4.3 Power consumption
The average power shall not exceed 10W (low temperature type does not include heating power consumption). 4.4 Insulation resistance and insulation strength
Should meet the requirements of 4.1.1 and 4.2.1 in GB/T15479-1995. 4.5
Tracking error
When the direct solar radiation irradiance is less than 120W/m, the tracking error shall not be greater than 1.5°. When the direct solar radiation irradiance is greater than 2
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or equal to 120W/m, the tracking error shall not be greater than 0.2°. 4.6 Timing error
The timing error of the internal clock should not exceed ±1s per 24h. 4.7 Load capacity
The torque of the tracker in both vertical and horizontal directions shall not be less than 5N·m. 4.8
Capture angle
Not less than 5°
4.9 Capture speed
Not less than 0.5 ()/s.
Shielding angle
The shielding angle should be 5°, with an error not exceeding ±0.5°4.11
The diameter of the shading ball
Should not be less than the diameter of the glass cover of the pyranometer sensor it carries. 4.12
2 Surface treatment
The shading ball and its supporting mechanism shall be painted black or blackened and oxidized. 3 Protection level
Should meet the IP65 level requirements specified in GB/T4208. 4.14 Corrosion resistance
GB/T33903—2017
After the tracker has been subjected to a 6-hour salt spray test, the corrosion resistance of the outer surface covering layer shall meet the S-level specified in GB/T6461-2002.
5 Test method
Working temperature range
Place the tracker in a constant temperature box and perform the test according to the following requirements: Start the tracker, raise the temperature of the constant temperature box to (60±1)°C and keep it for 16 hours, and the tracker shall be in normal working condition: Turn off the tracker, lower the temperature of the constant temperature box to (-20±1)°C and keep it for 16 hours, and the tracker shall be able to start normally; - For low-temperature trackers, turn off the tracker, lower the temperature of the constant temperature box to (-40±1)°C and keep it for 16 hours, and the tracker shall be able to start normally:
After the low-temperature test, raise the temperature of the constant temperature box to room temperature at a temperature change rate not exceeding 1K/min. 5.2
2 Power supply adaptability
Adjust the power supply voltage to the upper and lower limits of the voltage specified in 4.2 respectively, and the tracker should be able to start and work normally. 3
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GB/T33903—2017
5.3 Power consumption
Power consumption detection should be carried out indoors.
When using AC power supply, connect the tracker to the power supply through an AC digital power meter with an accuracy level of not less than 0.5. Turn on the tracker and continuously record the measured value of the AC digital power meter for 24 hours. The measured average power should meet the requirements of 4.3. When using DC power supply, adjust the accuracy level of not less than 1.The current measurement channel of the 0-level digital multimeter is connected in series to the power supply lead. Turn on the tracker and continuously record the DC current measurement value of the digital multimeter for 24 hours. The recorded measurement value multiplied by the power supply voltage is used as the measured power consumption. The measurement result should meet the requirements of 4.3. 5.4 Insulation resistance and insulation strength
The insulation resistance and insulation strength of the tracker are tested in accordance with GB/T15479-1995, and the test conditions are selected under general atmospheric conditions. The test results should meet the requirements of 4.4.
5.5 Tracking error
The tracking error detection test should be carried out in an outdoor environment when the sky is clear and cloudless. After the tracker is correctly installed, install the tracking error inspection special tool in Appendix A (hereinafter referred to as the special tool) on the tracker and keep it parallel to the tracker sensor. From sunrise to sunset, detect according to the following requirements: Disconnect the tracker sensor. Start the tracker and observe the light spot on the special tool light target every 1 hour. The light spot should be within the outermost circle of the light target.
Connect the tracking sensor, start the tracker, and observe the light spot on the special tool light target every 1h. The light spot should be within the innermost circle of the light target.
5.6 Timing error
Use the standard time as the time reference, keep the tracker clock running continuously for 120h, and the time error should not exceed ±5s. 5.7 Load capacity
Use a torque measuring instrument with an accuracy level of not less than 5 to measure the torque of the tracker in the vertical and horizontal directions respectively. The measurement results should meet the requirements of 4.7.
5.8 Capture angle
The test of capture angle detection should be carried out in an outdoor environment with direct solar radiation irradiance of not less than 500W/m2. Correctly install the tracker on a horizontal turntable with a graduation value not exceeding 0.5°. Start the tracker. When the tracking sensor is aligned with the sun, disconnect the tracking sensor, immediately adjust the turntable to rotate 5°, reconnect the tracking sensor, and the tracker should be able to drive the tracking sensor to align with the sun again.
5.9 Capture speed
The test of capture speed detection should be carried out in an outdoor environment with direct solar irradiance of not less than 500W/m2. Correctly install the tracker on a horizontal turntable with a graduation value not exceeding 0.5°. Start the tracker. When the tracking sensor is aligned with the sun, immediately adjust the turntable to rotate 5°. Use an electronic stopwatch or a mechanical stopwatch with an accuracy level not less than first class to start timing. When the tracking sensor is aligned with the sun again, stop timing. The recorded time should not exceed 10s. 5.10 Shielding angle
Use a vernier caliper to measure the diameter of the shading ball. Use a standard steel tape measure to measure the straight line 4
distance from the center of the shading ball to the center of the global pyranometer sensor. Calculate the shielding angle according to formula (1). The calculation result should meet the requirements of 4.10. d
α=2Xarctan(
Wherein:
Shielding angle, in degrees ();
dShading ball diameter, in millimeters (mm); L-the distance from the center of the shading ball to the center of the pyranometer sensor, in millimeters (mm). 5.11
Shading ball diameter
Use a vernier caliper to measure the diameter of the shading ball. The measurement result shall meet the requirements of 4.11. 5.12
2 Surface treatment
The visual inspection result shall meet the requirements of 4.12. 3 Protection level
According to GB/T 4208.
5.14 Corrosion resistance
GB/T33903—2017
According to the procedure specified in GB6458, the test cycle is 6h. The test results should meet the requirements of 4.13. 6 Label
A clear product label should be set on the tracker shell. The label should at least include the product name, product model, product number and production unit.
7 Packaging
The tracker should be packed in metal, wooden, paper and other packaging boxes when leaving the factory. The interior of the packaging box should have a fixed and earthquake-resistant structures. 5
GB/T33903—2017
A.1 Principle
Appendix A
(Normative Appendix)
Special tool for tracking error inspection
The principle of the tracking error inspection method is shown in Figure A.1. A
Figure A.1 Schematic diagram of the principle of the tracking error inspection method Assume that there are two parallel planes P1 and P2 at a certain distance. There is a light-transmitting circular hole at point C on P1. When the sun is at the normal position A of P1 and P2 (at this time, the tracking error is 0), the direct sunlight will pass through When the tracker has tracking errors, resulting in the sun being in position B instead of position A, the direct sunlight will be projected to point D on P2 through the light-transmitting circular hole. ZDCE is the tracking error at this time. The projection positions of the direct sunlight on P2 when ZDCE is marked as 0.2° and 1.5° respectively. By observing whether the projection position exceeds the marked position during the operation of the tracker, it can be judged whether the tracking error meets the requirements of 4.5.
A.2 Structure
Using the principle in A.1, a special tool for tracking error inspection is made as shown in Figure A.2. 613 requirements. 6 Labeling
A clear product label should be set on the housing of the tracker. The label should at least include the product name, product model, product number and production unit.
7 Packaging
The tracker should be packed in metal, wooden, paper or other packaging boxes when leaving the factory. The interior of the packaging box should have a fixed and earthquake-resistant structure. 5
GB/T33903—2017
A.1 Principle
Appendix A
(Normative Appendix)
Special tool for tracking error inspection
The principle of the tracking error inspection method is shown in Figure A.1. A
Figure A.1 Schematic diagram of the principle of the tracking error inspection method Assume that there are two parallel planes P1 and P2 at a certain distance. There is a light-transmitting circular hole at point C on P1. When the sun is at the normal position A of P1 and P2 (at this time, the tracking error is 0), the direct sunlight will be projected to point D on P2 through the light-transmitting circular hole. When the tracker has tracking errors, resulting in the sun not being in position A but in position B, the direct sunlight will be projected to point D on P2 through the light-transmitting circular hole. ZDCE is the tracking error at this time. Mark the projection position of the direct sunlight on P2 when ZDCE is 0.2° and 1.5° respectively. You can judge whether the tracking error meets the requirements of 4.5 by observing whether the projection position exceeds the marked position during the operation of the tracker.
A.2 Structure
Use the principle in A.1 to make a special tool for tracking error inspection as shown in Figure A.2. 613 requirements. 6 Labeling
A clear product label should be set on the housing of the tracker. The label should at least include the product name, product model, product number and production unit.
7 Packaging
The tracker should be packed in metal, wooden, paper or other packaging boxes when leaving the factory. The interior of the packaging box should have a fixed and earthquake-resistant structure. 5
GB/T33903—2017
A.1 Principle
Appendix A
(Normative Appendix)
Special tool for tracking error inspection
The principle of the tracking error inspection method is shown in Figure A.1. A
Figure A.1 Schematic diagram of the principle of the tracking error inspection method Assume that there are two parallel planes P1 and P2 at a certain distance. There is a light-transmitting circular hole at point C on P1. When the sun is at the normal position A of P1 and P2 (at this time, the tracking error is 0), the direct sunlight will be projected to point D on P2 through the light-transmitting circular hole. When the tracker has tracking errors, resulting in the sun not being in position A but in position B, the direct sunlight will be projected to point D on P2 through the light-transmitting circular hole. ZDCE is the tracking error at this time. Mark the projection position of the direct sunlight on P2 when ZDCE is 0.2° and 1.5° respectively. You can judge whether the tracking error meets the requirements of 4.5 by observing whether the projection position exceeds the marked position during the operation of the tracker.
A.2 Structure
Use the principle in A.1 to make a special tool for tracking error inspection as shown in Figure A.2. 6
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