Month: August 2018
Classification And Assignment Of High-voltage Disconnectors
Appointment breakers disconnectors are used to create a visible gap that separates derived from the work of conductive equipment parts which are under stress. This is necessary, for example, in the derivation equipment repairs for the safe production work. Disconnectors have no arcing devices and therefore are intended primarily to enable and disable the electrical circuits in the absence of current load and are only under stress or even stress-free. In the absence of a circuit breaker in the electrical, 6 – 10 kV is allowed to enable and disable disconnectors small currents significantly rated currents smaller vehicles, as described below. The requirements for disconnectors Requirements for disconnectors in terms of maintenance of their operational staff are as follows: 1) breakers should be clearly marked to create an open circuit, the voltage corresponding to the class setting, and 2) drives breakers must be capable of rigid fixation of the knives in each of the two operative provisions: enabled and disabled. In addition, they must have reliable stops that limit rotation of knives at an angle greater than a given, and 3) circuit breakers should be turned on and off at any of the worst environmental conditions (Eg, icing), and 4) support insulators and insulating rod must withstand the mechanical stresses resulting from operations, and 5) the main blades should have a lock disconnector with grounding blades device, eliminating the possibility of simultaneous operation of both. Classification and disconnector unit Individual types of disconnectors, 6 – 10 kV differ from each other by the nature of the installation (break the inner PB, EEO, RVF, RVFz and outdoor RLN, RLND, RLNDz, RD, RDZ installation) on the number of poles (single-pole circuit breakers PBO and pole), and the nature of the knife (break a vertically rotating and tilting type .) Three-pole circuit breakers operated lever drive (PR-10, PRN s), single – operational insulation rod. .
In the study of the causes of accidents at work, always provided to the human factor as one of the possible origins of occupational accidents. Emotional tension, anxiety, stress, the visual deficit, together with the intake of medication, are described as risk factors, of human origin, that they increase the possibility of injury or accidents, and the headache itself as illness or by their treatments, you can associate all these above mentioned factors. There are a wide range of symptoms related to the migraines and drugs used in its treatment, which act as possible work-related risk factors. They can be grouped into mape.es:-. Difficulty in concentration.
-. Alterations of vision. -Fatigue. -. Slow response and lack of motor coordination.
-. Reduction of the warning / attention. -. Contempt of the perception of risk. -. Mood disorders. -. Sleep disorders. People with chronic insomnia cause twice and half more accidents than those who sleep well. The problem is compounded if you add a copious meal or overwork. Drowsiness is a factor of the first magnitude and most of the causes that produce it are susceptible to prevention. Sleep disorders are, in many countries, the leading cause of death by accident. There are numerous reasons for the daytime sleepiness, as well as the derivative of the shortening of the periods of sleep (nocturnal physiological sleep deprivation), as the daytime sleepiness that produces apnea-hipoapnea syndrome is delsueno, variable shifts and temporary imbalances of travel (jet lag); but the drowsiness in people suffering from depression, narcolepsy, certain endocrine diseases, congestive heart failure is also frequent and, since then, the use of alcohol and drugs.