A centralized control cabinet for pumping unit well site

Abstract

The invention relates to a centralized control cabinet for pumping unit well sites. The device includes an air switch A, a soft-start rectifier power supply, a sub-well inverter device, an energy feedback unit, and a housing. The air switch A, soft-start rectifier power supply, sub-well The well inverter device and the energy feedback unit are packaged in the shell, the split well inverter device includes N inverter devices, the air switch A is connected to the soft-start rectifier power supply, and the output of the soft-start rectifier power supply terminal is connected to the input terminal of the energy feedback unit, the output terminal of the energy feedback unit is connected between the air switch A and the soft-start rectifier power supply, and the input terminals of the N inverters are connected to the same bus, the The bus bar is connected to the DC output end of the soft-start rectifier power supply, and the output ends of the N inverters are respectively connected to the N pumping unit motors one by one. Compared with the prior art, the present invention has the advantages of high power saving rate, low failure rate of power grid failure, convenient and cost-saving maintenance, maintenance, and the like.

Description

technical field [0001] The invention relates to a control cabinet, in particular to a centralized control cabinet for pumping unit well sites. Background technique [0002] my country's onshore oilfields are large energy and energy consumers, among which the power consumption of pumping units (commonly known as: kowtow machine) accounts for about one-third of the total power consumption of oil fields! After careful investigation and analysis, we found that the main reason is that 80% of the motor control cabinets of pumping units are still traditional control cabinets designed in the 1970s: basically open circuit + contactor mode. This kind of control cabinet can be said to have only one main function: to manually control the start, operation and stop of the pumping unit. It is not difficult to find that it has the following obvious technical defects: [0003] 1. The protection function is backward or absent: such as power supply phase loss protection, overvoltage protectio...

AI Technical Summary

Problems solved by technology

[0003] 1. The protection functions are backward or absent: such as power supply phase loss protection, overvoltage protection, undervoltage protection, overload protection, motor fault isolation, etc., the protection reliability is very poor, and the maintenance cost is high

[0004] 2. The stroke and stroke adjustment of the pumping unit need to be completed by heavy mechanical methods after stopping

[0005] 3. When the pumping unit starts, the impact current is very large. When it impacts the power grid, it also impacts the mechanical transmission mechanism of the pumping unit. The start-up consumes a lot of power and the operating loss is high.

[0006] 4. It is not easy to manage and realize automatic control

Images