1 the introduction
Due to the high risk of single unit operation, the existing power frequency operation of 2 induced draft fans, 2 air supply fans and 2 condensate pumps in Datang Huaibei Power Plant has been transformed into frequency converter operation. Therefore, the reliability of the inverter operation requirements are very high.
To analyze the influence of the failure of the high voltage power converter on the normal operation of the unit. Here are two examples of accidents.
1600KW 186A 746r/min COφ =0.861 Y type wiring. Application example: 4 sets of high voltage motors (2 sets of induced draft fans and 2 sets of air supply fans) of #8 furnace in a power plant are changed to frequency conversion for speed regulation operation as an example. 6KV high voltage motor model: YKK710-8. Capacity of SN2000KVA input: voltage 6KV current 192.5A output: voltage 0~ 6KV; Current 0 ~ 192.5 a; 0 ~ 50 hz frequency
The heat is larger because of the high power of the frequency converter. In order to ensure adequate ventilation and cooling effect, the power cabinet and transformer cabinet of the frequency converter respectively installed a set of integral fans on the top of the cabinet, and then through indoor air conditioning, the hot air is replaced to the outdoor, to ensure the overall cooling and ventilation requirements of the frequency converter.
Remove the original hydraulic coupler between the motor and the fan. 2.1 The connection between the motor and the fan is shown in Figure 1. The connecting steel shaft is installed between the motor and the fan, and the connecting shaft is made of hollow steel shaft. Blower driving mode to intermediate direct transmission, the original elastic dowel pin shaft coupling, diaphragm coupling instead, two pairs of diaphragm coupling, equipped with a hollow connecting shaft, intermediate shaft diaphragm coupling model for form01-2501 model for x430.10 its length is 1572 mm driving part gross weight is 539 kg instead of induced draft fan drive for intermediate direct transmission, will be in the original elastic dowel pin shaft coupling, and also to the diaphragm coupling, two pairs of diaphragm coupling, equipped with a hollow connecting shaft, The type of diaphragm coupling is Form11, the type of the intermediate shaft is X429.10, and its length is 1750mm. The total weight of the transmission part is 649kg. In addition, the baffle door of the induced draft fan inlet is changed from manual control to electric control, so as to meet the requirements of power frequency condition adjustment. In this way, the motor displacement and the cost of making the basis are omitted, and the reconstruction funds are saved.
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