Maintenance service of devices of power supplies on stages and stations

Maintenance service of devices of power supplies on stages and stations

Maintenance service is a complex of works for maintenance of serviceability and working capacity of devices of automatics and telemechanics by preparation and their use to destination, at storage and transportation.

Principal views of works on maintenance service are survey, action check, measurement of characteristics, adjustment, cleaning, greasing, painting, replacement of the worn out details and knots, restoration of serviceable action of devices at occurrence of refusals. As a rule, maintenance service carry out without deenergizing of devices from operation.

Maintenance service of devices of automatics and telemechanics is carried out by seniors of electromecanics, electromecanics and electrical engineers. The order of service and repair of devices is established by the chief of a distance of the alarm system and communication.

The senior electromechanic is obliged to provide qualitative service and repair of devices of automatics and telemechanics, to know a condition of served devices, regularly to check devices under the confirmed plan-schedule of maintenance service, to raise reliability of action of devices, to take measures to the fastest detection and elimination of refusals at their occurrence, providing thus traffic safety of trains.

The electromechanic should serve devices, support them in good repair, and also be able to carry out repair, installation, measurements and adjustment of devices at obligatory performance of rules of manufacture of works, regularly to improve work receptions, to master and apply the advanced methods of service of devices, to pass on experience and knowledge to the subordinated workers.

The electrical engineer is obliged: the nobility served devices; to be able to carry out metalwork and installation works, and also to use necessary measuring devices and the tool; under instructions electromecanics to spend other works connected with service of devices.

During operation of devices of power supplies of boiling devices of automatics and telemechanics there are the various malfunctions most typical from which following: перегорание safety locks; damage of rated sportsmen and equalizers to chains грозозащиты; infringement of norms of resistance of working and protective grounding; decrease in the straightened pressure at rectifiers; сульфатация and breaks of plates of accumulators; выкрашивание active weight and коробление plates of accumulators; short circuit between plates of accumulators; malfunction of a reserve food.

For prevention of damages of devices of power supplies it is necessary to observe strictly an order of maintenance service of devices according to operating instructions.

грозозащиты, measurement of resistance of working and protective grounding it is necessary to spend check of a condition of safety locks, check and adjustment of devices once a year. Replacement of all types of safety locks (irrespective of their condition) on new, in advance checked up, carry out in following terms: safety locks with face value of a current to 5 And inclusive — once a year; automatic switches of type АВМ and safety locks with face value more than 5 And — once in 3 years. Once a year the electromechanic changes rated sportsmen and pressure equalizers on checked up.

The most typical malfunctions of station devices of power supplies the following: a rated voltage deviation in chains of power supplies of devices of electric centralisation on panel board installation; malfunction of safety locks, switches, blocks of automatic adjustment of pressure, package switches and контакторов, buttons, contacts of the relay, plates of rectifiers, alarm system schemes перегорания safety locks of panel board installations, reserve power stations DGA, converters of a reserve food; damage of rated sportsmen and equalizers to chains грозозащиты; infringement of work of ventilation in a storage premise, various damages of accumulators; malfunction of a reserve food on an alternating current at stations.

For preventive maintenance and prevention of damages of power supplies of station devices it is necessary to observe strictly an order of maintenance service of devices according to operating instructions. Pressure of all feed circuits of devices of electric centralisation need to be checked once in 4 weeks; on panel board installation, clearness of work of switches and correctness of work of blocks of automatic adjustment of pressure the electromechanic once a week should carry out check of pressure of all feed circuits of devices ETS.

External survey of panel board installation with check of a working order and reliability of fastening of installation on clips, conditions of contacts of the relay, the buttons, open switches and контакторов, cleanliness of their contact surface, a condition of plates of rectifiers carry out once in 3 months.

The condition and trial start of reserve power stations DGA and converters of a reserve food with loading connection check 2 times a year.

Check and adjustment of devices грозозащиты, measurement of resistance of working and protective grounding, replacement of rated sportsmen and pressure equalizers carry out once a year.

Ventilation work in a storage premise check once in 4 weeks. With measurement of pressure and density of electrolit for systems with automatic adjustment of pressure carry out check of a condition of accumulators once in 4 weeks, stock-taking and serviceability of a reserve food on an alternating current at stations and stages — once in 3 months.

Check of a condition of rectifiers with measurement of the straightened pressure spend once in 3 months. The straightened pressure of the rectifier of type ВАК regulate without switching-off of loading by moving of the magnetic shunt or switching of sections of a secondary winding of the transformer. At the rectifiers working in a buffer mode, it is necessary to measure a direct current once a year. Check of a condition of accumulators with measurement of pressure and electrolit density is necessary for carrying out also once a year.

Presence and serviceability of a reserve food at stations and stages should be checked once in 3 months that carry out at measurement of pressure and switching of a food from the basic source on the reserve. In the absence of switching devices on stages such check can be carried out at measurement of pressure of the reserve power supply.

Electric parametres of devices of automatics and telemechanics measure by the devices having a class of accuracy not more low 2,5 for alternating current and 1,5 for direct current. Mechanical parametres of devices of automatics and telemechanics measure by devices or the adaptations having a class of accuracy or admissions which are defined by passport data on these gauges.