Functional safety electrified railways

Abstract

The study of functional safety includes identification of specific hazards that may cause serious consequences (e.g., human sacrifices), and establishing for each of them maximum frequency of occurrence. Reveals equipment, failure of which may contribute to the occurrence of such situations. Such equipment is usually referred to as "security-related". Examples include process of control systems, process shutdown systems, equipment alarm systems, centralization and blocking on the railway, controls the movement of the vehicle, medical equipment, etc. In other words, any equipment (software or not), failure of which may affect the occurrence of an emergency, should be regarded as "security-related". It should be noted that at present the world's leading corporations seek not just to provide EMC electrical systems that they produce, and make them functional safety. Functional safety is called security, which is associated with inadvertently cause failure in the performance of certain functions of the system. The reasons for failure may be defective programs, data, hardware, environmental effects and unintentionally incorrect of staff actions. Functional safety should be distinguished from the information security (generally deliberate action on the system); from electrical safety (protection of people from electrical shock) and from the explosion and fire (to prevent ignition of flammable gases and dust). Functional safety is also characterized by very close to the concept of reliability in that it takes into account not only the frequency of failures of the system but also the likelihood of a dangerous situation during a failure. The term "functional" with respect to the safety means automation security, which is dependent on the correct functioning of the system, i.e. the correct implementation of the system of its functions. In contrast, describes a failure rate of reliability regardless of the destination system and consequences caused by failures. However, reliability is used in the quantitative description of functional safety. The issues of functional safety and regulatory technical regulation in the field of electromagnetic compatibility technical equipment in electrified railways are considered.