High-voltage Doorknob Capacitors: A Promise Of Reliability In The Long-term Operation Of Synchrotron Radiation Sources

High-voltage doorknob capacitors:Long-term operation of synchrotron radiation sources
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As a major national scientific and technological infrastructure supporting cutting-edge multidisciplinary research, the value of synchrotron radiation sources lies in their high uptime and sustained, stable photon output. An unplanned outage can disrupt dozens of experiments, resulting in immeasurable loss of scientific opportunities. High-voltage doorknob capacitors, core components of high-voltage power supplies and pulse systems, are crucial for their long-term reliability and lifespan, directly impacting the overall operational performance and scientific output of the facility.
Harsh operating conditions of capacitors in synchrotron radiation sources:
Continuous high-voltage stress: In the electron gun high-voltage power supply and the RF system DC link, capacitors operate at their rated high voltage for extended periods, placing a constant strain on the dielectric strength of the dielectric.

Frequent pulse shocks: In the pulsed magnet power supply, capacitors are required to charge and discharge with high currents dozens of times per second, withstanding severe current and thermal stress shocks.

Striving for extreme maintenance cycles: Synchrotron radiation sources typically have short annual maintenance schedules, which means that critical internal components must have a trouble-free operating time far exceeding this, avoiding field replacement during operation.
Our longevity gene: the ultimate pursuit of materials, craftsmanship and quality:

Aging-Resistant Ceramic Dielectric: Utilizing highly stable ceramic materials with rigorously optimized proportions and doping, this material effectively suppresses dielectric aging and ion migration under high electric field strength, ensuring highly stable capacitance over a decade.

Reinforced Electrodes and Connections: Advanced co-firing of metallized electrodes and ceramic dielectric creates a strong chemical bond, resisting thermal fatigue and electrical stress. Multiple reinforcement processes are employed for the screw terminals and internal electrodes to prevent loosening due to vibration.

Excellent Thermal Stability and Heat Dissipation: Low dissipation factor reduces self-heating at the source. Combined with the efficient heat dissipation of a metal housing or epoxy resin encapsulation, core temperature rise is kept low. A rule of thumb states that for every 10°C reduction in operating temperature, life doubles.

Strict Screening and Testing: We utilize accelerated life testing (e.g., 1000 hours at 85°C/rated voltage) and advanced reliability statistical models to ensure our products meet the most stringent reliability requirements, with predicted failure rates (FIT) below industry standards.

Xian Xiwuer Electronic & Info. Co., Ltd. is a wholly state-owned company with a registered capital of 91.46 million RMB Yuan, owning a total assets of 315 million RMBYuan, under the jurisdiction of Xi'an State-owned Assets Supervision & Management Committee. There are about 400 employees, with an annual sales income of 250 million RMB Yuan.

The main products include Zinc Oxide Varistors, thermistors, H-V ceramic capacitors, SPD, and Solar Energy Surge Protective Devices. The company has advanced production equipment, including 18 large sintering furnaces, 8 automatic assembly lines, the largest energy impulse current generator and a series of special test equipment and environmental test equipment. In the same industry in China, the company has the largest production capacity and the highest degree of automation with the most complete testing methods.

Our employees are 8 with master's degrees and more than 80 engineers with senior technical titles. 12 technicians have been awarded Experts with Outstanding Contributions by the Xian municipal government, and 1 expert has been enjoying a special allowance from the State Council.

The company has five sites for business production and operation, covering an area of 50,000 square meters. Its construction area is up to more than 54,000 square meters.

· No.99, Fengqing Road, Lianhu District, Xi an(ceramic capacitor)

· No.1118, Ziqaing Road, Xincheng District, Xi' a (Headquarters, varistors, thermistors)

· No.11, Longshou South Road, Lianhu District, Xi' a (Registration, photovoltaic lightning protection box)

· Block A, No.18, Gaoxin Road, High-tech District, Xi' an

· Jinghe New Town Xi Xian New Area(the new plant)

• Xian Xiwuer Electronic and Info. Co., Ltd. is a wholly state-owned company with a registered capital of CNY 101.465 million (exchanged to USD 15.85 million), owning total assets of CNY315 million (traded to USD 49.22 million). It was established in 1976. Currently, it has about 460 employees, with an annual sales income of CN280 million (exchanged to USD43.75 million). The company has four production and business bases covering an area of 43052 square meters, and a construction area of more than 50000 square meters. The company has 8 persons with master's degrees, more than 80 engineers with senior technical titles 12 technicians who have been awarded Experts with Outstanding Contributions by the Xian municipal government, and 1 expert who has been enjoying a special allowance from the State Council.

• The main products include

            • Smart Embedded Epoxy Pole；

            • Integrated Instrument Transformer

• Capacitive Voltage Divider；

• High Voltage Capacitor Rod；

• High Voltage Film Capacitor；

• High Voltage Resistor；

• Primary and Secondary Integrated Intelligent assembly and components with the function of voltage measurement, current measurement, protection, temperature monitoring, and power supply；

• Medium-High Voltage components/parts/ assembly；

• Surge Protective Device for Power Supply System；

• Chips for lightening devices；

• Zinc Oxide Varistor；Thermistor.

Major Customers: ABB, Schneider, GE, ZTE, XD Electric, XJ Electric, PingGao Electric and etc.

• The company has the provincial Technical R&D Center. The company has developing and manufacturing experiences of the key products HV Ceramic Capacitor, SPD, Varistor, Thermistor and for nearly 20 years. There have been 32 patented technologies, 4 invention patents, and 4 national key new products. The company is in the leading position in the same industry. The company has grown very fast with a unique management system which is the fundamental guarantee to the continuous development of the enterprise under the state-owned system. In Northwest China, the company is the first to implement ISO 9001 standards and the first to promote the use of ERP management systems, having achieved ISO9001, ISO14001, and ISO45001 approval, thus standardizing and improving the management level of the company.
• Through continuous technological innovation, product R&D, and quality improvement the main technical performance and reliability of the products are at the internationally advanced level the same level as Panasonic and Siemens. The products have UL, VDE, TUV, CAS, CE, CQC, RoHS, and REACH certifications. The company has advanced production equipment among which the key production equipment and modern assembly lines are imported from Japan, the U.S.A, Germany, Korea, and Belgium including 26m large sintering tunnel furnaces8 automatic assembly lines, the largest energy impulse current generator and a series of special test equipment and environmental test equipment. In the same industry in China, the company has the largest production capacity and the highest degree of automation with the most complete testing methods. The company has two routine test laboratories with the most advanced lightning testing equipment and environmental testing equipment which comply with national standards for laboratory construction. They are the significant laboratories supported by Shaanxi Province with professional testing technicians undertaking part of the supervision and inspection of electronic products in Shaanxi Province at the same time.
• We believe we are able to supply satisfied goods and services to customers at home and abroad with the most reasonable price and the shortest delivery time. on the basis of our excellent quality assurance capacity, technical development capacity, and rich manufacturing experiences.

Through continuous technological innovation, product R&D, and quality improvement, the main technical performance and reliability of the products are at the international advanced level, at the same level as Panasonic and Siemens. The products have UL, VDE, TUV, CAS, CE, CQC, RoHS, and REACH Certification