1 Overview
With the continuous improvement of LED light efficiency in recent years, the life and reliability of LEDs have received more and more attention from the industry. It is one of the most important performances of LED products . Lifetime is the ultimate performance of reliability. However, the theoretical life of LED is very long. Like the traditional light source, the cycle test of 2h45min and 15min is used to end the life. The measurement of LED products is obviously unrealistic. Therefore, it is necessary to adopt accelerated aging life test for LED products [1]. At the same time, it should also test the thermal properties, environmental weather resistance, electromagnetic compatibility immunity and other properties closely related to life and reliability, in order to comprehensively analyze LED. life.
2, LED reliability and life-related key indicators
Every component and link in the manufacture of LED products has an impact on its reliability and lifetime, such as the solder joints of LED junctions and substrates, the thermal quenching and degradation of LED phosphors, the degradation of packaging materials, and the failure of drivers. The final possibility of degradation is the semiconductor (PN junction) itself. These factors lead to LED product failure (degeneration) in different ways, generally can be divided into gradual degradation (gradual degradation) and transient degradation (abrupt degradation).
LED's graded degradation (failure) indicators mainly include:
The lumen maintenance rate decreases, that is, the light decay, generally with an initial luminous flux of 100%. When the lumen maintenance rate of the LED product drops to 70% or 50% of the initial value, the LED is considered to be ineffective, and the lumen maintenance life is correspondingly recorded as L50 or L70;
Color drift, subject to changes in phosphor or packaging materials, the color of the LED will drift during the lifetime, the drift should be within the specified range (such as Δu'v' ≤ 0.007), beyond the range is considered LED failure;
Changes in electrical properties, electrical performance changes can be monitored more intuitively;
The number of switches, the switch may have a certain impact on the drive and other circuits;
Thermal resistance changes and other thermal characteristic parameters, thermal characteristics are closely related to life, and measurement and analysis of thermal characteristics can help identify weak links in LED reliability;
LED transient degradation (failure), that is, the LED light output suddenly drops to 0, its main degradation includes: anti-electromagnetic interference capability: electrostatic discharge, lightning surge, fast group pulse, cycle drop; high and low temperature impact tolerance characteristics; Salt spray, moisture resistance, vibration, etc.
3. Relevant standard requirements
In view of the main slow-degradation of LEDs, relevant standards have been released in the world, so that the North American system and the International Commission on Illumination (IEC) system are the most typical, and the Chinese standards basically combine these two systems.
ENERGY STAR® Program Requirements Product Specification Eligibility Criteria;
IES LM-80-08 Approved Method for Measuring Lumen Maintenance of LED Light Sources;
IES TM-21-11 Projecting Long Term Lumen Maintenance of LED Packages;
IEC/PAS 62717 LED modules for general lighting – Performance requirements;
EC/PAS 62722-2-1 Luminaire Performance – Part 2-1: Particular requirements for LED luminaires;
China's GB/T 24824, GB/T24823, QB/T4057, etc.;
China's GB/T XXXX LED accelerated life test method (not yet released).
Silicon Rubber Insulated Power Cable
1. Introduction and Application
This product is suitable for as connection cable of fixed laying down power transmission line or movable electric equipment with 0.6/1kv of AC rated voltage or below.Like Rubber Cable,frame retardant cable,Mica Tape Insulated Cable. It features heat radiation resistant, cold resistant, acid and alkali resistant, corrosive gases resistant, waterproof and so on, flexible cable structure , constant electric performance at the environment of high temperature(high and cold),outstanding anti-ageing performance, long life.. It is wide used for many industries such as metallurgy, electric power, petrochemical, electronic and automobile manufacturing, etc.
2. Product standard: Enterprise standard
The test of fire retardant and fireproof characteristic should be carried out in accordance with GB/T18380.3-2001, GB/T19216.21-2003.
3. Operating characteristics
a. The rated voltage: U0/U 0.6/1kv
Max. operating temperature: 180℃
Min. ambient temperature:-60℃
b. Laying temperature of cable not less than -25℃
c. Permissible bending radius of cable: Min. 10 times of diameter
4. Type and Designation
Type: YGC, YGCR, YGCP, YGC22, YGG, YGGR, YGGP, YHXG
Designation:
YGC: Silicon rubber insulated and sheathed power cable
YGCR: Silicon rubber insulated and sheathed movable flexible power cable
YGCP: Silicon rubber insulated and sheathed copper wire screened power cable
YGC22: Silicon rubber insulated and sheathed steel tape armored power cable
YGG: Silicon rubber insulated and sheathed installation line
YGGR: Silicon rubber insulated and sheathed movable installation line
YGGP: Silicon rubber insulated and sheathed copper wire braided screened installation line
Remarks: if in front of type of fire retardant silicon rubber cable adds ZR, if in front of type of flame retardant silicon rubber cable adds ZR, copper wire in conductor line core may be tin electroplating.
5. Main performance
â‘ DC resistance of finished cable conformity with GB/T3956.
② Insulation resistance is not less than 100MΩ·km at 20℃..
â‘¢ Cable withstands the test of AC 50Hz 3.5kV for 5 min, without breakdown.
Rubber Insulated Cable,EPR Insulated Cable,Class 5 Tinned Cable,Mica Tape Insulated Cable,Rubber Cable
Huayuan Gaoke Cable Co.,Ltd. , https://www.bjhygkcable.com