GQA Traction silicon rectifier
I. Usage and Characteristics
The silicon rectifier provides DC power supply for traction engine. It realizes rectification through silicon rectifying elements with the characteristics of high efficiency, long lifecycle and easy to use and maintain.
Denotation of product model:
II. User Conditions
2.1 Altitude of installation point should not exceed 1,000m.
2.2 Ambient temperature indoors should not be lower than -10℃ and should not be higher than +40℃.
2.3 Maximum relative humidity in air should not exceed 85% (equivalent to an air temperature of 20℃±5℃).
2.4 The installation place should be free of conducting and explosive dust, corrosive metal and gases or steams damaging insulations.
2.5 Voltage fluctuating range of power grid should not exceed ±10%.
2.6 The installation place should be free of violent vibration and impact and vertical inclination should not exceed 5%.
III. Outlook and structure
The equipment is an upright type. The cabinet is made of optimum sheet steel which is bent and welded. It has the advantages of solid structure and beautiful appearance. The cabinet has double doors, which is convenient for internal servicing. All elements are installed inside the cabinet. The control panel is composed of silicon-controlled rectifier elements and control components. For the convenience of operation and observation, all the operating buttons, measuring instruments and indicators are set on the front door of the cabinet. There is a ring set on the top of the cabinet for hoisting during installation. A cable duct or a pad should be set under the cabinet.
IV. Rectifying Route and work
4.1 Route structure
This silicon rectifier employs three-phase bridge rectifier circuit. The input is three-phase three-wire system based AC voltage 380. After various links of the route, e.g. rectifier transformer and silicon rectifier cell assembly, DC power supply is obtained. To ensure normal operation of equipments, over-current protection system and alarm system are set. See the circuit diagram for the detailed route (attached below).
4.2 Operation procedures of the equipment are listed as below:
4.2.1 Close the control switch and the power indicator (red) lights up.
4.2.2 Press the startup button. When the main circuit is energized, the power indicator (red) goes out and the running indicator (green) lights up.
4.2.3 Connect the control switch. There is no need to press the startup button. The switch is closed automatically via time relay. In case of over-current trip, manual closing operation is not needed. It can run automatically via time relay (0-60s adjustable). Then, the equipment starts work.
4.2.4 Press the shutdown button to close the main switch.
V. Installation and Maintenance
5.1 Installation place of the equipment should comply with use conditions as required. There should be adequate distance between the cabinet and surrounding structures (e.g. wall) for the convenience of operation and inspection.
5.2 Prevent inversion and violent vibration of the equipment during installation and hoisting. Check elements and components (including screws) inside the cabinet thoroughly after installation to ascertain if any of them are loose, shed or damaged for vibration and impact or affected with damp during transportation. If any, take necessary actions.
5.3 The equipment has been tested and debugged before leaving the plant. However, it is still necessary to conduct no-load and light-load test before putting it into use to verify whether the equipment is intact and well-conditioned.
5.4 Make an overhaul regularly of the equipment during normal operation. Normally, it should be shut down and overhauled once a quarter to remove dirt inside the cabinet and check whether the elements are well conditioned.
5.5 As overload capacity of silicon elements is low, it is not allowed to use the equipment in overloaded condition for a long term.
5.6 When any element is damaged, it is required to replace another one of the same specifications and model.
5.7 Where the equipment is not to be used for some time, package it and put it at a dry place indoors.