CN-224218303-U - Power plant feeder motor wiring framework

Abstract

The utility model belongs to the technical field of electrical equipment, and particularly discloses a wiring framework of a motor of a coal feeder of a power plant. The device comprises a direct current energy supply group, a low voltage ride through device, a factory alternating current power supply, a frequency converter and a coal feeder motor; the device realizes that the frequency converter can still drive the coal feeder motor to stably operate when the alternating current factory power voltage is reduced, and the wiring architecture is simple and clear, the additional energy consumption is less, and the maintenance is convenient. Is suitable for popularization in the coal supply process of the boiler of the thermal power plant.

Inventors

• Cao Qunjiao
• YU FEI
• CHEN CHANGJIAN
• HU DEYI
• HU HAO
• ZHOU CAIYANG
• XU PENG
• TANG HAIYANG
• ZHANG JIAN

Assignees

• 中国电力工程顾问集团中南电力设计院有限公司
• 华润电力(仙桃)有限公司

Dates

Publication Date

20260508

Application Date

20250418

Claims (4)

1. 1. A wiring structure of a coal feeder motor of a power plant is characterized by comprising a direct current energy supply group, a low voltage traversing device, a plant alternating current power supply, a frequency converter and the coal feeder motor, wherein the direct current energy supply group is electrically connected with an input side of the low voltage traversing device, an output side of the low voltage traversing device is electrically connected with a direct current input side of the frequency converter, the plant alternating current power supply is electrically connected with an alternating current input side of the frequency converter, the coal feeder motor is electrically connected with an alternating current output side of the frequency converter, the plant alternating current power supply provides 380V alternating current, and the direct current energy supply group provides 220V direct current.
2. 2. The power plant coal feeder motor wiring architecture according to claim 1, wherein the direct current energy supply group comprises a plant direct current power supply, a super capacitor and a double-power switching device, wherein the output side of the double-power switching device is electrically connected with the input side of the low voltage ride through device, the input side of the double-power switching device is normally connected with the plant direct current power supply, and when the direct current feeder is in power failure, the direct current energy supply group is automatically switched to be connected with the super capacitor.
3. 3. A power plant feeder motor wiring architecture as in claim 2, wherein each set of dc powered groups is electrically connected to the input side of a plurality of low voltage ride through devices, respectively.
4. 4. A power plant feeder motor wiring architecture as in claim 3, wherein the plant ac power source is electrically connected to the ac input side of a plurality of frequency converters, each frequency converter controlling 1 feeder motor.

Description

Power plant feeder motor wiring framework Technical Field The utility model belongs to the technical field of electrical equipment, and particularly discloses a wiring framework of a motor of a coal feeder of a power plant. Background The coal feeder is a key device of a coal-fired power plant and is responsible for continuously and uniformly conveying scattered coal particles to a boiler, the stable operation of the coal feeder directly influences the combustion efficiency and the unit safety, the motor is used as a power source of the coal feeder, and the design rationality of a wiring structure of the motor directly influences the performance of the coal feeder. For possible reasons, the power supply of the coal feeder can be subjected to an instantaneous voltage drop, And the phase-to-phase short circuit is that wires in different phases in the power grid are directly contacted due to insulation damage and the like, so that short circuit current is instantaneously increased, a large amount of electric energy is consumed by a short circuit path, and the voltage of other parts of the power grid is instantaneously reduced. And the grounding short circuit is that the lead is contacted with the ground or the grounding body, so that short circuit fault can be caused, current flows to the ground, the normal current distribution of a power grid is destroyed, and voltage drop is caused. When large-capacity equipment such as a large motor, a large transformer and the like is started, the voltage of a power grid can be instantaneously dropped. The lightning stroke is that high voltages can be induced on the power line, when the high voltages invade the power grid, the power grid protection device can be caused to act, and part of the lines are tripped, so that the operation mode of the power grid is changed, and instant voltage drop is caused. In addition, lightning strikes directly hit the power grid equipment, possibly cause equipment damage, cause faults such as short circuit, also can lead to voltage to drop in the twinkling of an eye. When the load in the power grid suddenly increases or decreases, such as when a large number of users simultaneously turn on or off electrical equipment, the power balance of the power grid is broken, and the system needs to readjust parameters such as voltage, frequency and the like to adapt to a new load state, and in the process, instantaneous voltage drop may occur. The power system faults, namely that some key equipment in the power grid such as a generator, a transformer, a power transmission line and the like are in fault, and the power transmission is possibly interrupted or blocked, so that the power supply capacity of the power grid is reduced, and voltage drop is caused. In addition, stability problems of the power system, such as system oscillations, etc., may also lead to momentary voltage fluctuations and sags. If the coal feeder is stopped due to voltage drop, the coal of the boiler is possibly broken, the combustion is unstable and even flameout is caused. Re-ignition is time consuming and costly, causing unnecessary losses. In order to solve the above problem, a compensation circuit needs to be inserted into a power circuit of a coal feeder to maintain stable operation of a motor of the coal feeder, but the existing control circuit wiring mode is complex and complicated, and when the motor is installed and maintained, technicians need to spend a large amount of time to clear the circuit connection relation, so that not only is the working efficiency reduced, but also the risk of misoperation is increased, and once wiring errors occur, the motor can not be normally started or even damage the motor and other related equipment, the production progress is affected, and the extra maintenance cost is caused. How to design a convenient wiring framework for the power line of each feeder motor is clear and mutually noninterfere, thereby can the accurate power distribution unbalance that the average voltage drop caused, guarantee the normal operating of feeder is the problem that current thermal power plant technicians need solve. Disclosure of utility model In order to solve the technical problems listed in the background art, the utility model provides a wiring structure of a motor of a coal feeder of a power plant. The specific technical scheme is as follows: The wiring framework of the coal feeder motor of the power plant comprises a direct current energy supply group, a low voltage traversing device, a plant alternating current power supply, a frequency converter and a coal feeder motor, wherein the direct current energy supply group is electrically connected with the input side of the low voltage traversing device, the output side of the low voltage traversing device is electrically connected with the direct current input side of the frequency converter, the plant alternating current power supply is electrically connected with the alternating current input side of t