XJ Co.

Xuchang, China
Xuchang, China
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Yan Y.,XJ Co. | Pan D.,XJ Co. | Zhang X.,XJ Co. | Zhu M.,XJ Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2016

This paper firstly introduced the principle of reflective fiber optical current transformer, described the electromagnetic compatibility requirements of reflective fiber optical current transformer which works in a complex strong electromagnetic environment, then presented the measures against electromagnetic interference of reflective fiber optical current transformer. Finally, in connection with fiber optical current transformer, some electromagnetic compatibility tests were carried out in this paper, mainly consists of the radio frequency conducted immunity test, the electrostatic discharge immunity test, the surge immunity test, the electrical fast transient burst immunity test and the damped oscillatory waves immunity test. According to the results of the initial tests, it can not able to meet the requirements completely. In order to improve the anti-interference capability, the appropriate corrections were implemented by various optimization measures of electromagnetic compatibility, which include the addition of elements like filter capacitor and TVS tube applied on power modules and signal board input power. In this paper, the magnetic was also joined to the power line, and the conductive spring contacts reed was added to the chassis, traces in the chassis were also rational distributed. By the results of the second tests, it is totally satisfactory. © 2016, Xi'an High Voltage Apparatus Research Institute Co., Ltd. All right reserved.

Huo P.-F.,XJ Co. | Wang G.-G.,Ningxia Guyuan Power Supply Bureau | Liu M.,XJ Co. | Zhang P.-Z.,XJ Co. | Zou Z.-L.,XJ Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

This paper comprehensively introduces and summarizes the converter valve block strategy of the DC protection based on Xiangjiaba-Shanghai ±800 kV UHVDC project. In order to obtain more smooth and fast or more secure stop effect when relevant fault has been detected, the converter need to be removed and isolated as soon as possible to prevent the further breakdown and reduce the impact on the device and power grid. In this project, the different fault conditions are tested and simulated on site, the primary device is effectively protected through phase-shift, temporary stop, block, etc. According to the different combinations and delay of these fault clearing actions, the DC protection block are divided into four categories.

Kong L.-K.,XJ Co. | Zhang A.-L.,XJ Co. | Cao S.,XJ Co. | Chang Z.-T.,XJ Flexible Transmission System Corporation | Zhang H.-Z.,Zhoukou Power Supply Corporation
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013

This paper presents a control and protection system for operational test of ultra high voltage thyristor valves to fully meet the requirement of IEC60700-1 specifications. The system is composed of control and protection hosts, HMI system, control device of converter pulse, analog measurement unit, etc. In this system, there are PCI bus, CAN bus, and TDM bus, which transmit data among functional units. By means of controlling circuit source, voltage source and auxiliary equipments, configuring parameters of converter pulse, switching test items automatically, the system makes the whole test process flexible and stable. The protection system provides comprehensive, effective protection for primary equipments by monitoring the status of the operational test system. The operational test results show that this C&P system is reliable and effective and provide a substantial base and platform for research and development of high voltage thyristor valves and related fields.

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