牵引电器用电器介绍

1. 牵引电器用电器介绍

2. Arm type Pantograph arms pantograph is the most traditional, also called "Ling" shape pantograph, because of the shape of a diamond. But now for the maintenance cost is higher, plus the fault has snapped tram line risk, now part of the new factory of railway vehicles, has been used for single-arm pantograph; also part of the railway vehicle (such as the Shinkansen 300 Series) from the arms the pantograph, transformed into single-arm pantograph.

3. Single arm type • In addition to his arms, was also a single-arm pantograph, also known as the "of" (Z) (will) pantograph. This section of the pantograph benefit is low than arms pantograph noise, faults are more difficult to break the tram line, as the current general pantograph type. And according to the design mode of the railway vehicle manufacturing plant, will be slight differences in the design of the pantograph.

4. Vertical type • In addition to the above two pantograph, and some of the pantograph is vertical, also known as "T" shape (also known as wing) pantograph, its low windage resistance characteristics especially suitable for high speed, to reduce traffic noise. So the pantograph is mainly used for high speed railway vehicles. But due to high cost, vertical type pantograph has no use (Japanese Shinkansen 500 Series transformation by the vertical type pantograph to single-arm pantograph).

5. Structure of the pantograph to make it in the open and overhead contact network maintain slight contact. When the train stops, the pantograph can close down. May the standing wave train pantograph caused in the overhead cable will affect the collecting ability, so some system is prohibited for use of the pantograph. • The pantograph is from simple trolley developed, trolley buses and trams, still use the trolley.

6. The subway system • The subway system • A lot of the underground railway system in order to reduce the tunnel construction cost, will use third rail power supply instead of the overhead contact system, in order to reduce tunnel bore height to save construction cost. But also the use of overhead contact line underground railway, overhead contact them, are generally very low, almost close to the roof, to reduce the height of tunnel to save construction cost. For the same reason, the whole world most subway adopts DC electric power supply, without the use of the equipment required is relatively complex, the body and the overhead cable also need high alternating current as power supply.

7. Air circuit breaker, also known as the air switch, refers to the circuit breaker contact on-off in air at atmospheric pressure, is a kind of circuit breaker. Air circuit breaker is a kind of very important appliance of low-voltage distribution network and the electric drive system, it sets the control and protection function. In addition to the complete contact and breaking the circuit, it can protect the short circuit, electric circuit or equipment serious overload and voltage, but also can be used for less frequent starting motor.

8. Air circuit breaker • As the air, is used to manually (or electric) closing, keep closing position locking, low voltage switch from tripping mechanism and plays the role to a trip arc-extinguishing device, is widely used in AC, DC device below 500V, switch on, the circuit breaking and load rated current and short circuit, overload fault current. When the circuit overload, short circuit occurs, voltage is reduced or disappear, can automatically cut off the circuit, reliable protection. Circuit breaker of the dynamic, static contact and rod design, various types of circuit breakers, but the increase is the main purpose of breaking capacity. The contact structure, restriction of breaking short-circuit current peak limiting principle, has obvious effect on improving the breaking capacity of circuit breaker, and is widely used in.

9. The basic principle of • The basic principle of • The basic principle of air circuit breaker short-circuit currents are much larger than normal load current, short circuit current result in tripping tripping, the movable contact and the static contact under the action of the spring separately, makes the circuit disconnect. • The short circuit current lead to tripping tripping, there are a variety of ways, usually by the realization of the principle of electromagnet, coil through the load current when the electromagnet suction, after the short circuit current when suction is enough to make the armature movement, drives the tripping tripping. • Air switch point with overload protection, is generally use double metal sheet, when the circuit load reaches a certain time, the heat will double sheet metal deformation result in tripping tripping to cut off circuit. • The working principle of air air circuit breaker working principle of air circuit breaker circuit breaker working principle of air circuit breaker working principle of air circuit breaker switch is turned on, as, in the circuit breaking and load rated current, and can occur in the circuit and motor overload, short circuit, undervoltage conditions under reliable protection. Circuit breaker of the dynamic, static contact and rod is designed into shape, the electric repulsion generated by short circuit makes the dynamic and static contact disconnect, high breaking capacity, current limiting characteristics of strong. At the short circuit, the static contact around the aromatic insulation gasification, played the role of cooling interrupter, zero flashover distance. Circuit breaker arc-quenching chamber using a metal gate structure, the contact system with repulsion limiting mechanism, therefore, circuit breaker with high breaking capacity and current limiting capability. With multiple release. Inverse time-lag action is the bimetallic strip is heated and bent to release action, instantaneous action is core Street Railway sector-led tripper action. Tripping mode of electromagnetic and thermal compound release, 3. Air switch internal comparison precision, the principle is very simple. It has 10 20 ring inductance in line and the line, current enough attraction driven mechanical lever and protection. Comparison of safety and without changing the insurance, is a good recommendation. Automatic air switch is also called low voltage circuit breaker, can be used to switch on and off load circuit, also can be used to control the motor not frequent starting. It is functionally equivalent to the knife switch, over current relay, loss of pressure relay, thermal relay and earth leakage protective device and other electrical part or all of the total function, is a kind of important protection device in low voltage distribution network. Automatic air switch has multiple protection functions (overload, short circuit, under voltage protection action value), the advantages of adjustable, high breaking capacity, convenient operation, safety, so it is widely used. Structure and working principle of automatic air switch by the operating mechanism, contact, protection device (various releases), composed of arc extinguishing system. Automatic air switch working principle diagram as shown in fig..

10. Auxiliary contact: auxiliary contact is the main circuit breaker, mechanism of mechanical interlocking contact, mainly used to display circuit breaker, the bonding state, through the circuit breaker closing in the control of circuit breaker, the implementation of control or the related electrical interlocking. For example, the output to the signal lamp, relay signal. Molded case circuit breaker shell grade rated current 100A for single breakpoint changeover contact, 225A and above for overhead contact structure, resistive current of 3A; shell grade rated current of 400A and above can be installed two normally open, two normally closed, resistive current of 6A. The same total number of operating performance operating performance and the number of circuit breaker. • Sht: is a kind of release and excited by voltage source, its voltage independent of voltage and main circuit. Shunt trip is a remote control opening attachments. When the supply voltage is equal to any voltage rated control supply voltage of 70%-110%, can reliably breaker. Shunt release is short-time work, the coil is energized time is generally not more than 1S, otherwise the line will be burned. Molded case circuit breaker in order to prevent the coil burnt, a microswitch connected in shunt trip coil, when the shunt release through the armature is attracted, the normally closed microswitch into a normally open, because the control line shunt tripping device, power supply is cut off, even if artificially holding down the button, shunt coil has no electricity avoid coil burning. When the breaker recramped after closing, micro switch to a normally closed position.