Electric traction

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Electric traction

• Name??
• N006
• Class??111

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Chapter one

• FirstPantograph
• SecondMain circuit breaker

3
Pantograph

• Effect Electric traction power from the catenary
  to obtain electrical equipment installed in the
  motorcycle or motor car roof. Pantograph arm can
  be divided into two kinds of bows and bow arms,
  by skateboarding, the upper frame, lower arm (arm
  bow with the next frame), chassis, up bow
  springs, drive cylinder, support insulators and
  other components. Diamond pantograph, also known
  as Diamond pantograph, formerly very common, as
  well as higher costs due to maintenance after a
  fault is easy to pull off when the catenary and
  gradually phased out in recent years to use more
  arm bow (see Figure). Load current through the
  contact line and pantograph contact surface
  fluency, it is the line of contact between the
  slide and the contact pressure, transition
  resistance, the contact area on, depending on the
  pantograph and catenary interactions.

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Action principle

• (1) l bow Compressed air enters through the
  electro-pneumatic valve uniform drive cylinder,
  the cylinder piston compression spring bow down
  inside the cylinder, so that the next time l bow
  spring arm rotation, lift the upper frame and
  slide, pantograph uniform rise in the contact
  line when approaching a slow stagnation, and then
  quickly touch the contact line.(2) bow down
  drive compressed air cylinder subjected to
  electric bow cushion valve rapidly discharged to
  the atmosphere, in the spring bow down under the
  action of the spring force to overcome l bow, so
  that the pantograph declined rapidly from the
  catenary.

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Pantograph Category

• Double-armDouble-arm pantograph is the most
  traditional pantograph, also called "diamond"
  shaped pantograph, because of the shape of a
  diamond. But now due to higher maintenance costs,
  coupled with a failure of the risk of tearing the
  tram line, now part of the new factory of railway
  vehicles, have switched to single-arm pantograph
  while some railway vehicles from the original
  arms type pantograph, transformed into single-arm
  pantograph
• Single-armIn addition to arms type, then there
  are single-arm pantographs, also referred to as
  "the" (Z) (dogleg) shaped pantograph. This
  section pantograph benefit is more than double
  arm pantograph noise is low, failure is also more
  difficult to tearing tram line for the current
  pantograph more common type. The railway vehicle
  manufacturer based on the design of each in
  different ways, in the design of the pantograph
  will be a little different.

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• VerticalIn addition to these two pantographs, as
  well as some of the pantograph vertical design,
  also known as "T"-shaped (also called thumb)
  pantograph, its low drag characteristics
  particularly suitable for high speed, in order to
  reduce driving noise. Therefore, this section is
  mainly used for high-speed pantograph rail
  vehicles. However, due to the high cost, vertical
  pantograph has not used

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Single-arm pantograph structure
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Main circuit breaker

• StructureMain circuit breaker interrupter and
  transmission control two parts, assembled upper
  and lower sides of the aluminum plate. On the
  side of interrupter, parallel resistance, support
  insulator, turning vase, isolation switch blade
  lower side storage cylinder, the main valve,
  starting valve, closing solenoid, opening
  electromagnet, delay valve, drive cylinder,
  positioning mechanism, the auxiliary switch
  interlock. In the interior of the part forming a
  cavity.

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• Action principleSolenoid is not energized,
  compressed air into the starting valve and the
  main valve cavity. Closing, the closing solenoid
  operation, compressed air from the starting gate
  valve combined into drive cylinder, the piston
  pushing the lever to the left to turn the vase by
  rotating, isolating switch blade to closing
  position, auxiliary switch interlock contacts
  closing solenoid power off immediately. Sub-gate,
  Tripping solenoid operation, compressed air from
  the main valve chamber to the atmosphere by
  starting valve cylinder of compressed air in the
  reservoir under the action of the main valve
  piston right, compressed air through the main
  valve, supporting insulator cavity into off arc
  chamber, pushing the moving contacts of the main
  circuit breaker in the off state compressed air
  then enters the moving contacts vents,
  extinguishing the arc, and by the housing vent to
  the atmosphere. Into the main valve of the
  compressed air, and by the delay valve into the
  drive cylinder, the piston moves to the right,
  thus promoting the rotating vase rotation,
  isolation switch blade open, the auxiliary switch
  interlock contacts immediately Tripping solenoid
  power supply cut off.

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• Work characteristicsBoth main circuit breaker
  control and protection for both purposes, the
  circuit breaker has a higher than normal
  mechanical life. Main circuit breaker main job is
  breaking traction transformer small load currents
  (including no-load excitation current), a strong
  airflow can quickly be such a small inductor
  current is cut off, caused by the closure of a
  large over-voltage. To suppress the over-voltage,
  arc chamber movement in parallel between a set of
  nonlinear contact resistance. Amount of
  compressed air used directly as arc media, it is
  subject to filtering and drying before into the
  main circuit breaker. In order to adapt to the
  complex environmental conditions, the main
  circuit breaker is gradually improving as a
  vacuum circuit breaker with a sealing element,
  both to improve the reliability and reducing
  maintenance.

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