On April 23, 2018, our newly developed ground protection power supply passed the HALT test and other performance tests of Xuchang Cape Laboratory. Passing this test means that our local protection power supply fully meets the testing and use requirements of the State Grid. It means that in the relay protection industry, our company is at the forefront of the industry and is in a relatively high position in the industry. It means that our company has made great progress in design and production. It means that in the follow-up product promotion and service, our company has more advantages and is more trustworthy. The specific information of power supply is as follows:
1. product model
1.DFJDH30-5
The power supply is 85-265Vac input, 5.1V/6A output, 30W output power, 400ms holding time, with overvoltage, overcurrent, short circuit and other protection, please see the company's website for specific specifications.
2.SHR302-JDH
The power supply is 176-264Vac input, 5V/4A,6.8V/1.6A dual output, with an output power of 30W. Please refer to the company's website for specific specifications.
3.XJ251-05
The power supply is 85-300VDC input, 5.1V/4A output, and the output power is 20W. It can be used in parallel. Please refer to the company's website for specific specifications.
2. product features
Localized protection, different from traditional centralized protection, refers to the installation of relay protection devices close to primary equipment, reducing the loss of sampling cable materials and power, simplifying the cable connection with control equipment such as switches, etc. It has the characteristics of simplifying secondary circuit, saving construction investment, convenient operation and maintenance, etc. Correspondingly, higher requirements are put forward for power supply, that is, higher service life and more reliable design are required, our power supply has a design life of more than 20 years, a mean time between failures (MTBF) of more than 100000 hours, low temperature operation up to -95 degrees, high temperature operation up to 115 degrees, vibration magnitude up to 55Grms, electromagnetic compatibility up to 6kV surge and pulse group requirements, meeting the national standard GB/T29309-2012 accelerated stress test procedures for electrical and electronic products-high accelerated life test guidelines, under extremely harsh conditions, ensure the reliable and stable operation of the product.
Introduction of 3. HALT Experiment
State Grid Corporation of China has always attached great importance to the application reliability of products. In the technical specifications of local protection devices of State Grid Corporation of China, the requirements for the life and reliability of local protection devices are clearly put forward.
a) The design life of the device shall not be less than 15 years.
B) The power supply life is consistent with the design life of the whole machine.
c) The connector life shall be consistent with the design life of the whole machine.
d) The mean time between failures MTBF of the device is greater than 80000 hours.
In order to effectively verify the requirements of the standard for the reliability of local protection, quickly and effectively discover the design defects of the device, and effectively improve the hardware level of the local protection device, the reliability of the field application and the service life of the product, it is recommended to carry out the highly accelerated life test in the professional test of the local protection. High accelerated life test (HighlyAcceleratedLifeTesting, referred to as HALT test) is a kind of electronic and mechanical assembly parts using rapid high and low temperature transformation of the shock system to reveal the design defects and deficiencies of the process, at the same time can greatly shorten the reliability test time. For details, please refer to the national standard GB/T29309-2012 Accelerated Stress Test Procedures for Electrical and Electronic Products-Guidelines for Highly Accelerated Life Tests.
4. Summary
In order to meet the requirements of the State Grid on the reliability and life of protection devices and power supplies, our company adopts different design schemes to improve product reliability, establishes a more stringent long-life material platform to increase product life and MTBF, and adds HALT test to carry out comprehensive test verification according to national standards, so as to ensure the high performance, high stability and high reliability of the products.
