Safety Analysis and Protection Measures of the Control System of the Pulsed High Magnetic Field Facility in WHMFC
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Safety Analysis and Protection Measures of the Control System of the Pulsed High Magnetic Field Facility in WHMFC J.T. Shi · X.T. Han · J.F. Xie · L. Yao · L.T. Huang · L. Li
Received: 10 June 2012 / Accepted: 10 October 2012 / Published online: 18 October 2012 © Springer Science+Business Media New York 2012
Abstract A Pulsed High Magnetic Field Facility (PHMFF) has been established in Wuhan National High Magnetic Field Center (WHMFC) and various protection measures are applied in its control system. In order to improve the reliability and robustness of the control system, the safety analysis of the PHMFF is carried out based on Fault Tree Analysis (FTA) technique. The function and realization of 5 protection systems, which include sequence experiment operation system, safety assistant system, emergency stop system, fault detecting and processing system and accident isolating protection system, are given. The tests and operation indicate that these measures improve the safety of the facility and ensure the safety of people. Keywords Pulsed high magnetic field facility · Monitoring and control system · Safety measures
1 Introduction The pulsed high magnetic field is one of the most important extreme conditions in modern scientific experiments. A PHMFF, which is powered by a modular 12.6 MJ/25 kV capacitor bank and designed to generate long-pulse, short-pulse and multistage magnetic fields ranged from 0 T to 80 T [1], has been established in WHMFC. Using a dual-coil magnet, 83 T pulsed magnet field was achieved successfully on Nov 6, 2011. J.T. Shi · X.T. Han () · J.F. Xie · L. Yao · L.T. Huang · L. Li Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan, Hubei, China e-mail: [email protected] J.T. Shi · X.T. Han · J.F. Xie · L. Yao · L.T. Huang · L. Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei, China
J Low Temp Phys (2013) 170:562–568
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Fig. 1 The fault tree of the safety failure
During the experiment of the PHMFF, the current will be up to 39.6 kA, voltage will be up to 25 kV, and magnetic field will be up to more than 80 Tesla [2]. Serious casualties maybe occur if people are in the dangerous zones, and the devices will be damaged if the facility is out of control. Therefore the reliability of the control system, which is the operation platform for experiments, is very important. Ensuring the safety is the basic designing principle of the control system.
2 Safety Analysis Although the whole charge-discharge process continues only several minutes, various types of fault maybe happen. In order to reduce the safety risks of the facility, safety factors should be analyzed. Fault Tree Analysis (FTA) is a technique for analyzing the possible basic causes (primary failures) for a given hazard (top event). Here the safety failure is analyzed as the top event. All kinds of primary devices failures are listed as basic causes. Figure 1 shows the fault tree of the safety fail
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